109.01_seo_operating manual_ sanitary waste treatment water system

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COMMENTS :

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B Sign.N. 18/04/2011

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09/10/2010

R E V

ETABLI

ESTABLISHEDVERIFIE

CHECKED APPROUVE APPROVED

DATE MODIFICATIONS STAT

Approved Approved as noted Returned for correction For information

Date : ………………………….. Signature : …………………………….

LAHMEYER INTERNATIONAL

GOVERNMENT OF THE REPUBLIC OF THE SUDANMINISTRY OF IRRIGATION AND WATER RESOURCES

MEROWE DAM PROJECT IMPLEMENTATION UNIT

MEROWE DAM PROJECT 10 x 140MVA

CONTRACTS 3A, 3B, 3C, 3E

ENGINEER:CONTRACTOR:

OPERATING MANUAL

SANITARY WASTE WATER TREATMENT SYSTEM-SEO-

SCALE1/1 Subcontractor:

INTERNAL USE

Power EnvironmentHydro

REV

BSH/SH END

1/

N of SH AHS MRW00SEO.OM.109.01

Ce document propriété de ALSTOM ne doit pas être utilisé, copié ou communiqué à des tiers sans son autorisation

AHS-MRW00SEO.OM.109.01

REVISION: B Rev. Date: 18.04.2011

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CHAPTER

B) List of Illustrations 3

C) Introduction: 4

C1) General Description of Equipment ………… 5

C2) Brief Description of Equipment Use ………… 9

C3) Definitions and Technical Terms Used ……… 11

C4) List of items used ……… 22

D) Detailed Description of Equipment

E) Operating Principles and Characteristics

● TECHNICAL SPECIFICATIONS OF THE EQUIPMENT ‐‐‐

SANITARY WASTE WATER TREATMENT SYSTEM

● MATERIAL LIST ‐ SANITARY WASTE WATER TREATMENT SYSTEM ………… 36

●

GENERAL

FUNCTION

PROCESS ‐

SANITARY

WASTE

WATER

TREATMENT

SYSTEM ………… 40

‐ LIST OF MAIN EQUIPMENTS & ACTUATORS ………… 43

‐ GENERAL DESCRIPTION OF SANITARY WASTE WATER TREATMENT SYSTEM ………… 44

‐ SYSTEMS MANAGEMENT & OPERATION PRINCIPLES ………… 51

‐ FAULT PROCESSING ………… 73

F) Operating Instructions

G) Testing and Adjustment

● OPERATING MANUAL ‐ SANITARY WASTE WATER TREATMENT SYSTEM ………… 84

‐ INTRODUCTION ………… 88

‐ DESCRIPTION OF THE PLANT ………… 90

‐

SAFETY

INSTRUCTIONS ………… 99

‐ ELECTRIC EQUIPMENT WORKING PRINCIPLE ………… 101

‐ STOPPING AND RESTARTING THE PLANT ………… 124

‐ RUNNING THE PLANT ………… 128

‐ OTHER PROCEDURES ………… 132

‐ HELP FOR FAULTS CORRECTION ………… 142

H) Maintenance Instructions: 149

H1) Preventive Maintenance ………… 150H2) Repair and Adjustment ………… 151

H3) Spare Parts Lists ………… 152H4) Special Tools Lists ………… 154

H5) List of Suppliers ………… 155

J) As Built Drawings ………… 156

25

OPERATION & MAINTENANCE MANUAL

……………

PAGE

……………

……………

……… 24

……… 83

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B) LIST OF ILLUSTRATIONS

AHS.MRW92.SEO-RE100

SANITARY WASTE WATER TREATMENT

SYSTEM - FACTORY TEST REPORT AND TEST

CERTIFICATES

SITE TEST REPORTSSEO – DOMESTIC SEWAGE – SANITARY

WASTEWATER TREATMENT SYSTEM



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C) INTRODUCTION



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C1) BRIEF DESCRIPTION OF EQUIPMENT



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TAG Nb DESIGNATION DIAGRAM MODEL

92 SEO 001 AR 1 Cabinet Control AHS MRW 92 SEO SD 100 800X400X20

92 SEO 002 AR 1 UV srerilizer control cubicle AHS MRW 92 SEO SP 104 R2 D3 L95

92 SEO 007 BA 1 Waste tank AHS MRW 92 SEO SP 102 Vol: 1000 litr

92 SEO 008 BA 1 Discharge tank AHS MRW 92 SEO SP 104 Vol: 125 litr

92 SEO 001 CO 1 Air compressor AHS MRW 92 SEO SP 104 DNX 3200T

92 SEO 001 CQ 1 Media module AHS MRW 92 SEO SP 103 2830x1210x

92 SEO 002 CQ 1 Media module AHS MRW 92 SEO SP 104 2830x1210x92 SEO 003 CQ 1 Media module AHS MRW 92 SEO SP 104 2830x1210x



92 SEO 006 CQ 1 Skid AHS MRW 92 SEO SP 104 3500x1200x

92 SEO 001 DG 1 Mechanized bar screen AHS MRW 92 SEO SP 102 SERTEL 9/2

92 SEO 001 DL 1 Uninterruptible power supply AHS MRW 92 SEO SD 100 ENT-TW15

92 SEO 003 PO 1 Sewage transfer pump AHS MRW 92 SEO SP 102 DP 3057 MT

92 SEO 004 PO 1 Sewage transfer pump AHS MRW 92 SEO SP 102 DP 3057 MT

92 SEO 005 PO 1 Sludge pump AHS MRW 92 SEO SP 104 TX70 ANN

92 SEO 006 PO 1 Sludge pump AHS MRW 92 SEO SP 104 TX70 ANN

92 SEO 001 SR 1 UV sterilizer AHS MRW 92 SEO SP 104 R2 D3 L95

92 SEO 001 ZE 1 Mechanical mixer AHS MRW 92 SEO SP 102 4620-410

92 SEO 001 ZV 1 Blower AHS MRW 92 SEO SP 104 SV 8.400/2 -

92 SEO 002 ZV 1 Blower AHS MRW 92 SEO SP 104 SV 8.400/2 -

SANITARY WASTE WATER TREATMENT SYSTEM - EQUI




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N° TAG DESIGNATION INTERFACE MO

01 92SEO001DG Mechanized bar screen Sewage tank (92SEO002BA) SERTEL 9/25

02 92SEO003PO Sewage transfer pump Sewage tank (92SEO002BA) DP 3057 MT

03 92SEO004PO Sewage transfer pump Sewage tank (92SEO002BA) DP 3057 MT

04 92SEO001ZE Mechanical mixer Sewage tank (92SEO002BA) 4620-410

05 92SEO001SR UV sterilizer Discharge tank (92SEO008BA) 2XR2D3L95

07 92SEO001MD Electromagnetic flowmeter Discharge tank (92SEO008BA) PROMAG 10

08 92SEO001CO Air compressor Sludge pumps (92SEO005PO&006PO) DNX 3200T /

09 92SEOSP002 Pressure switch Air compressor (92SEO001CO) NAUTILUS

10 92SEO005PO Sludge pump Primary settling tank (92SEO003BA)

Secondary settling tank (92SEO005BA)

Sludge stabilization (92 SE0 006 BA)

TX70 ANN

11 92SEO003EL Control solenoid valve Sludge pump (92SEO005PO) Type 5281 A

12 92SEO006PO Sludge pump Primary settling tank (92SEO003BA)Secondary settling tank (92SEO005BA)

Sludge stabilization (92 SE0 006 BA)

TX70 ANN

13 92SEO004EL Control solenoid valve Sludge pump (92SEO006PO) Type 5281 A

14 92SEO058VE Pneumatic valve Secondary settling tank (92SEO005BA) AP100 G

15 92SEO003EL Control solenoid valve Pneumatic valve (92SEO058VE) Type 6014 C

16 92SEO059VE Pneumatic valve Primary settling tank (92SEO003BA) AP100 G

17 92SEO001EL Control solenoid valve Pneumatic valve (92SEO059VE) Type 6014 C

18 92SEO001ZV Blower Fixed bed bioreactor (92SEO004BA) SV 8.400/2 -

19 92SEO002ZV Blower Fixed bed bioreactor (92SEO004BA) SV 8.400/2 -

20 92SEO001DL Uninterruptible Power Supply Control Cabinet (92SEO001AR) ENT-TW15

SANITARY WASTE WATER TREATMENT SYSTEM - RATING PL

AHS MRW 92 SEO LG 100 - Rev A - RATING PLATES.xls AHS-MRW00SEO.OM.109.01



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C2) DESCRIPTION OF USE OF EQUIPMENT



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C3) DEFINITION OF TECHNICAL TERMS

Wastewater Glossary

Acidic: the condition of water or soil that contains a sufficient amount of acid substances to

lower the pH below 7.0.

Activated Sludge:

Sludge that has undergone flocculation forming a bacterial culture typically carried out intanks. Can be extended with aeration. See Extended Aeration.

Advanced Primary Treatment: The use of special additives to raw wastewater to cause flocculation or clumping to helpsettling before the primary treatment such as screening.

Advanced Wastewater Treatment Any advanced process used above and beyond the defacto typical minimum primary andsecondary wastewater treatment.

Aeration

the mixing or turbulent exposure of water to air and oxygen to dissipate volatile contaminants

and other pollutants into the air.

Aeration tank

a chamber used to inject air into water.

Aerobic Wastewater TreatmentOxygen dependent wastewater treatment requiring the presence of oxygen for aerobicbacterial breakdown of waste.

Algicide

substance or chemical used specifically to kill or control algae.

Alkaline

the condition of water or soil that contains a sufficient amount of alkali substance to raise the

pH above 7.0.

Alkalinity

the measurement of constituents in a water supply which determine alkaline conditions. The

alkalinity of water is a measure of its capacity to neutralize acids. See pH.

Alkalinity A measure of a substances ability to neutralize acid. Water containing carbonates,bicarbonates, hydroxides, and occasionally borates, silicates, and phosphates can bealkaline. Alkaline substances have a pH value over 7

Anaerobic: Wastewater treatment in which bacteria breakdown waste without using oxygen.



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Anaerobic Wastewater TreatmentWastewater treatment in the absence of oxygen, anaerobic bacteria breakdown waste.

Aqueous solubility

the maximum concentration of a chemical that will dissolve in pure water at a reference

temperature.

Backwashing

reversing the flow of water through a home treatment device filter or membrane to clean and

remove deposits.

Bar screen

in wastewater treatment, a device used to remove large solids from the incoming wastewater

stream.

Bacteria

Single cell Microscopic living organisms lacking chlorophyll that digest many organic andinorganic substances. An essential part of the ecosystem including within human beings.

BioengineeringThe use of living plants as part of the system, be it wastewater treatment, erosion control,water polishing, habitat repair and on.

Biological treatment / BioreactorThe biological treatment in the fixed bed bioreactor is the main treatment in the waste water

plant. The process consists of decomposing soluble organic compounds in the waster waterinto carbon dioxide, nitrogen compounds and water. This decomposition is principally doneby a bacteria population in aerobic conditions.

Biological oxidation

decomposition of complex organic materials by microorganisms. Occurs in self-purification of

water bodies and in activated sludge wastewater treatment.

BiosolidsRich organic material leftover from aerobic wastewater treatment, essentially dewateredsludge that can be re-used.

BOD - Biochemical Oxygen DemandSince oxygen is required in the breakdown or decomposition process of wastewater, its"demand" or BOD, is a measure of the concentration of organics in the wastewater.

Blowdown

the water drawn from boiler systems and cold water basins of cooling towers to prevent the

buildup of solids.

Breakpoint chlorination

addition of chlorine to the point where all organic matter and ammonia compounds havebeen destroyed and any additional chlorine becomes a free chlorine residual available for

disinfection.



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Clarifier A piece of wastewater treatment equipment used to "clarify" the wastewater, usually somesort of holding tank that allows settling. Used when solids have a specific gravity greater than1.COD - Chemical Oxygen Demand

The amount of chemical oxidant required to breakdown the wastes, also an indicator of theconcentration of organics.

Chlorination

the adding of chlorine to water or sewage for the purpose of disinfection or other biological or

chemical results.

Clarification

the clearing action that occurs during wastewater treatment when solids settle out.

Clarification is often aided by centrifugal action or chemically induced coagulation.

Clarifier

a tank in which solids settle to the bottom and are subsequently removed as sludge.

Coagulation

in water treatment, the use of chemicals to make suspended solids gather or group together

into small flocs.

Combined SewerCombining the municipal sewer systems with storm drainage. Risks overpowering the

system in large rain events. The benefit is that pollutants from storm drainage get treated,

Combined Sewer Overflow (CSO)When a combined sewer system is overpowered by storm drainage and overflows.

Constructed Wetland An artificially created wetland usually with a waterproof lining for wastewater purification.Detention, flow rates, types of plants and other parameters are controlled to improve BOD,SS and N removal. Typical riparian plants like cattails and reeds are used to provide bacteriawith an oxygenating root zone.

Deionized water water free of inorganic chemicals.

Detention Time - Retention Time, Residence TimeHow long on average wastewater undergoes the wastewater treatment process. Time varygreatly across various types of wastewater treatment, from minutes to weeks.

Dewatered SludgeThe sludge after it's been dewatered, also know as sludge cake.

Dewatered Sludge CakeThe sludge after dewatering that is cake like, compressed. The lower the water content thebetter for wastewater treatment purposes.

DewateringRemoving water from sludge or other solids.



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Dewater

remove or separate a portion of the water in a sludge or slurry to dry the sludge so it can be

handled and disposed; remove or drain the water from a tank, trench, or aquifer.

DigestionThe breaking down of sludge and other waste biologically by microorganisms. Results inbyproducts such as methane gas, carbon dioxide, sludge solids and water. Aerobic digestionrequires oxygen, anaerobic digestion the absence of oxygen.

DenitrificationBiologically removing nitrate converting it to nitrogen gas.

Dilution ratio

the critical low flow of the receiving water at the point of recycled water discharge divided by

the flow of the discharge. Is used in the biomonitoring test to simulate in-stream conditions

that organisms will be exposed to during critical low-flow times.

Discharge

the volume of water that passes a given point within a given period of time. It is an all-

inclusive outflow term, describing a variety of flows such as from a pipe to a stream, or from

a stream to a lake or ocean.

Disinfectant

a chemical or physical process that kills or inactivates pathogenic organisms in water.

Chlorine is the most commonly used disinfectant for recycled water, potable water supplies,

wells, and swimming pools. Other disinfectants include ozone, bromine, iodine, chlorinedioxide, heat, and ultraviolet light.

DisinfectionThe use of chemicals to kill any disease causing organisms in the polished wastewater. UVlight can also be used.

Dissolved Oxygen (DO)The amount of oxygen dissolved in the water. Measured in milligrams per liter.

EffluentThe final output flow of a wastewater treatment plant.

Extended Aeration An aeration system that adds aerobic sludge digestion to the activated sludge process.

Facultative PondsWastewater ponds with some form of aeration for oxygen replenishment. Can also use algaeand other plants for oxygen replenishment.

Filter a device used to remove solids from a mixture or to separate materials. Materials are

frequently separated from water using filters.



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Filtration

the mechanical process which removes particulate matter by separating water from solid

material, usually by passing it through sand.

FlocParticulate and or bacterial clumps forming wooly looking clusters in wastewater. Inbiological processes such as extended aeration or activated sludge and others the floccontains aerobic or anaerobic microorganisms. For industrial applications flocculants areused.

FlocculationThe process whereby a chemical or other substance is added to wastewater to trap or attractthe particulate suspended solids into clusters or clumps of floc or flocculent, wooly lookingmasses.

Flocculating AgentThe flocculant or chemical used to cause flocculation.

FlocculantSame as flocculating agent, the catalyst substance that causes the chemical reaction withTSS to form flocculent many times encapsulating the solids.

FlocculentThe "floc" or wooly mass of clusters that is formed in flocculation. Many times usedinterchangeably with "flocculant" however truly refers to the floc mass and not the catalystflocculating agent.

Free Water Surface Wetland (FWS) A constructed wetland or other shallow wastewater treatment pond where the shallow wateris exposed directly to the air.

GreaseFats, soaps, oils, waxes and etc. in wastewater.

Grit ChamberUsually in municipal wastewater treatment, a chamber or tank in which primary influent isslowed down so heavy typically inorganic solids can drop out, such as metals and plastics.

Head

the pressure of a fluid owing to its elevation, usually expressed in feet of head or in pounds

per square inch, since a measure of fluid pressure is the height of a fluid column above a

given or known point.

HeadworksThe beginning of the treatment plant where the influent begins treatment.

Hydrometer

an instrument used to measure the density of a liquid.

Impermeable

material that does not permit fluids to pass through.



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Impervious

the quality or state of being impermeable; resisting penetration by water or plant roots.

Impervious ground cover like concrete and asphalt affects quantity and quality of runoff.

Industrial EcologyIndustrial Ecology (IE) focuses on combining perpetually desirable outcomes in environment,economy and technology sustainably. The primary tenet is that all systems mimic nature andare thus closed loop, continuous, circular. In wastewater treatment industrial ecology wouldmean that all so called "waste" is re-input into the same or other process. For example,biosolids as fertilizer can be considered a use of sludge consistent with industrial ecology.Recycling wastewater into the treatment plant, manufacturing or other process is anotherexample.

Industrial Wastewater TreatmentWastewater treatment for industries such as manufacturing, food processing, corrugators,

printing and so on. Paper and pulp mills' treatment of wastewater is an example of industrialwastewater treatment. Municipal wastewater treatment would be an example not consideredto be industrial.

InfluentThe untreated wastewater or raw sewage coming into a wastewater treatment plant.

Influent ScreensSreens used to remove large inorganic solids from the wastestream.

Innovative and Alternative (I&A)

An EPA term for wastewater treatment systems that reuse all or part of the wastewater.

Jar test

a laboratory procedure that simulates a water treatment plant's coagulation/flocculation units

with differing chemical doses, mix speeds, and settling times to estimate the minimum or

ideal coagulant dose required to achieve certain water quality goals.

Liquid Solids SeparationThe process of separating the liquids and solids in a given wastewater. Liquid/solidsseparation comes in one of 3 processes:

1. If the solids sink (specific gravity greater than 1) use a clarifier2. If the solids float (specific gravity less than 1) use a floatation unit (DAF)3. If neither sink or float (specific gravity is 1) try using a screen (rotary or parabolic)

Mechanized Bar Screen located at the inlet of sewage tank remove biggersolids from wastewater to prevent clogging

MGDMillion Gallons per Day - 694.4 gallons per minute.

Mixing zone

a limited volume of receiving water that is allocated for diluting a wastewater dischargewithout causing adverse effects to the overall water body.

Modified Permit, WaiverEPA variances or waivers granted.



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PH A measure of acidity or alkalinity of water, or any given substance. The scale is 1 to 14 with7 being neutral. Over 7 is alkaline or caustic, under 7 is acid or base.

Phenols

organic compounds that are byproducts of petroleum refining; tanning; and textile, dye, and

resin manufacturing. Low concentrations cause taste and odor problems in water; higher

concentrations can kill aquatic life and humans.

Phosphorous

a plant nutrient that can cause an overabundance of bacteria and algae when high amounts

are present, leading to a depletion of oxygen and fish kills. High levels of phosphorous in

water are usually caused by agricultural runoff or improperly operating wastewater treatment

plants. Also see nitrogen.

P: PhosphorusThe measure of Phosphorus present in wastewater, causes algae blooms.

Polychlorinated biphenyls (PCBs)

toxic industrial chemical compound substances that were used in the manufacture of plastics

and as insulating fluids in electrical transformers and capacitors. Banned since 1979, PCBs

continue to be found in fish/animals.

PPM - parts per million

number of parts of a chemical found in one million parts of a solid, liquid, or gaseous mixture.

Equivalent to milligrams per liter (mg/L).

Primary Wastewater TreatmentThe first process usually associated with municipal wastewater treatment to remove thelarge inorganic solids and settle out sand and grit.

Primary settling tank Here the wastewater is going to be clarified so that only solubleorganic matters are sent to the fixed bed bioreactor.

Raw SewageUntreated sanitary wastewater.

Reclaimed WaterReusable wastewater from wastewater treatment such as tertiary treatment of wastewater inbiological and other systems.

Remediation

methods used to remove or contain a toxic spill or hazardous materials from a Superfund

site; a generic term used to describe cleanup activities.

Run Off

Storm flows that aren't absorbed and flow off the land and streets.

Sand filters

devices that remove suspended solids from a wastewater treatment plant effluent or water

treatment plant product.



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Sanitary Wastewater (domestic)Wastewater from human domestic water use.

Saturation

the condition of a liquid when it has taken into solution the maximum possible quantity of a

given substance at a given temperature and pressure.

ScumUsually fatty material in wastewater that floats.

Secondary Wastewater TreatmentSecond biological process of digestion with bacteria.

Secondary settling tank After biological treatment the secondary tank receives the effluentby gravity. Here the treated effluent is going to be clarified. Then the clarified water of the

secondary settling tank is directed by gravity across the UV disinfection treatment (U.Vsterilizer to the discharge tank

Sedimentation

a large scale water treatment process where heavy solids settle out to the bottom of the

treatment tank after flocculation.

Seep

a spot where water contained in the ground oozes slowly to the surface and often forms a

pool; a small spring.

Seepage

percolation of water through the soil from unlined canals, ditches, laterals, watercourses, or

water storage facilities.

Segment

a water body or portion of a water body that is individually defined and classified. A segment

is intended to have relatively homogenous chemical, physical, and hydrological

characteristics.

Sewage (or wastewater)The used water and added waste of a community which is carried away by drains andsewers.

Sewerage A system of sewers; the removal of waste materials by means of a sewer system.

Skimming

using a machine to remove oil or scum from the surface of the water.

Sludge

The solid waste material which settles out in the wastewater treatment process, sometimesbiosolids. Can be dewatered and reused or disposed.



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Sludge digester

tank in which complex organic substances like sewage sludge are biologically dredged.

Energy is released and much of the sewage is converted to methane, carbon dioxide, and

water.

Sludge DewateringRemoving the remaining water from sludge for reuse and to lighten the sludge for reuse ordisposal.

Solubility

the amount of mass of a compound that will dissolve in a unit volume of solution.

Solute

any substance derived from the atmosphere, vegetation, soil, or rock that is dissolved in

water.

Soft water

any water that does not contain a significant amount of dissolved minerals such as salts of

calcium or magnesium.

Storm Water Run-Off (SRO)The pulse of surface water following a rainstorm. The water carries sediment, gas, oil, animalfeces, glass and other waste from the watershed to receiving waters creating a difficulturban/suburban wastewater problem.

Storm Drain A pipeline or channel system that carries surface water and/or runoff to public waters, butdoes not feed into sewer system.

Subsurface Flow Wetland (SF) A type of constructed wetland in which primarily treated waste flows through deep gravel orother porous substrate planted with wetland vegetation. The water is not exposed to the air,avoiding problems with odor and direct contact.

Suspended solids

the small solid particles in water that cause turbidity. Particles of suspended sediment tendto settle at the channel bottom, but upward currents in turbulent flow counteract gravitational

settling.

TDS - Total Dissolved SolidsTotal Dissolved Solids (TDS) is a the combined total of all dissolved solids in wastewater,both organic and inorganic and very fine, such as colloidal minerals. Generally particles mustbe smaller than two micrometers to be considered a dissolved solid. For example, saltdissolved in water is a dissolved solid. Therefore TDS will "survive" screening or othercoarse filtration.

Tertiary Wastewater Treatment (Advanced)Biological or chemical polishing of wastewater to remove organics, solids and nutrients.Tertiary wastewater effluent limits are generally 10 mg/1 BOD5 and 10 mg/1 TSS.



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Tertiary TreatmentThe use of filtration to remove microscopic particles from wastewater that has already beentreated to a Secondary Level. Anthracite coal is the filter medium used by the MWWD.

Toxic pollutant

those pollutants or combinations of pollutants, including disease-causing agents, which after

discharge and upon exposure, ingestion, inhalation or assimilation into any organism can, on

the basis of information available, cause death, disease, behavioral abnormalities, cancer,

genetic mutations, physiological malfunctions or physical deformation in such organism or

their offspring. The quantities and exposures necessary to cause these effects can vary

widely.

TreatabilityHow treatable a water sample is with a given substance. The "treatability" of Floccin™ isvery high with a wide array of wastewater types. The more treatable wastewater is, the

better, obviously. All wastewater is treatable, how easy it is varies. The treatability can betested using samples in a "jar test". A small water sample is taken and placed in a jar. Thenthe flocculant or other treatment additive mixed in and the results observed. Treatability testsare an important part of wastewater optimization.

Total Coliforms

include bacteria that are found in the soil, in water that has been influenced by surface water,and in human or animal waste.

TSS - Total Suspended Solids

As the name implies, the total solid particles that are suspended (as opposed to dissolved) inthe wastewater. TSS must be filtered out, flocculated, digested and so on for removal in thetreatment of wastewater. Though not necessarily pollutants TSS is considered to be ameasure of pollutants in water by the EPA in the US.

Turbid

thick or opaque with matter in suspension. Rivers and lakes may become turbid after a

rainfall.

Turbidity

A measure of how clear water is in ntu, invisible to the average naked eye until readings inexcess of 100 are reached, typically determined by shining light through a sample placed ina turbidimeter.

Ultraviolet Disinfection (UV) / UV SterilizerThe use of ultraviolet light to kills bacteria and other microorganisms in water andwastewater. Typically a final treatment step.

WastewaterWastewater is "used" water, the water leftover after its use in numerous application such asindustrial, agricultural, municipal, domestic and on



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C4) List of Items Used

UNIT SYS. NUM TYPE DESIGNATION SUPP. ROOM

00 SEO 001 BA DOMESTIC SEWAGE TANK (20m3) CW 0L203

00 SEO 002 BA TRANSFER SEWAGE TANK AHSOUTDOOR

00 SEO 001 CR DOMESTIC SEWAGE PUMPS CONTROL BOX AHS 0M306

00 SEO 002 CR DOMESTIC SEWAGE TRANSFER PUMP CONTROL BOX AHS OUTDOOR

00 SEO 010 CR JUNCTION BOX AHS 0M306

00 SEO 020 CR JUNCTION BOX AHS 0L209

00 SEO 030 CR JUNCTION BOX AHS 0C810

00 SEO 001 FI DOMESTIC SEWAGE FILTER AHS 0M306

00 SEO 001 PO DOMESTIC SEWAGE SERVICE PUMP AHS 0L203

00 SEO 002 PO DOMESTIC SEWAGE STAND BY PUMP AHS 0L203

00 SEO 003 PO TRANSFER PUMP SEWAGE WATER AHS OUTDOOR

20 SEO 001 CRDOMESTIC SEWAGE COMMUNICATION LOCAL CONTROLBOX

AHS 0M405

91 SEO 001 BA SEWER SHAFT CW outdoor

91 SEO 001 PO SEWER SHAFT SERVICE PUMP AHS outdoor

91 SEO 002 PO SEWER SHAFT STAND BY PUMP AHS outdoor

92 SEO 001 AR CABINET CONTROLER AHS STP

92 SEO 002 AR UV STERILIZER CONTROL CUBICLE AHS STP

92 SEO 002 BA SEWAGE TANK 60m3 AHS STP

92 SEO 003 BA PRIMARY SETTLING TANK 8,1m3 AHS STP

92 SEO 004 BA FIXED BED BIOREACTOR 53m3 AHS STP

92 SEO 005 BA SECONDARY SETTLING TANK 16,7m3 AHS STP

92 SEO 006 BA SLUDGE STABILIZATION TANK 30m3 AHS STP

92 SEO 007 BA WASTE TANK 0,5m3 AHS STP

92 SEO 008 BA DISCHARGE TANK AHS STP

92 SEO 009 BA MOBILE TILT WASTE TANK 0,3m3 AHS STP

92 SEO 001 CO AIR COMPRESSOR AHS STP

92 SEO 001 CQ MEDIA MODULE AHS STP






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92 SEO 006 CQ SKID AHS STP

92 SEO 001 CRDOMESTIC SEWAGE COMMUNICATION LOCAL CONTROLBOX

AHS STP

92 SEO 001 DG MECHANIZED BAR SCREEN AHS STP

92 SEO 001 DL UNINTERRUPTIBLE POWER SUPPLY AHS STP

92 SEO 003 PO SEWAGE TRANSFER PUMP AHS STP

92 SEO 004 PO SEWAGE TRANSFER PUMP AHS STP

92 SEO 005 PO SLUDGE PUMP AHS STP

92 SEO 006 PO SLUDGE PUMP AHS STP

92 SEO 001 SR UV STERILIZER AHS STP

92 SEO 001 ZE MECHANICAL MIXER AHS STP

92 SEO 001 ZV BLOWER AHS STP

92 SEO 002 ZV BLOWER AHS STP



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D) DETAILED DESCRIPTION&

E) OPERATING PRINCIPLES ANDCHARACTERISTICS



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- TECHNICAL SPECIFICATIONS

OF THE EQUIPMENT-



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TABLE OF CONTENTS

1. SUBJECT .........................................................................................................................................................4

2. POLLUTION DATA .............................................................. ......................................................... ................4

2.1. P OPULATION EQUIVALENT ........................................................................................................................4

2.2. D AILY LOAD..............................................................................................................................................4

2.3. T REATMENT GOALS ...................................................................................................................................4

3. DESIGN BASIS................................................................................................................................................5

4. TREATMENT PRINCIPLE...........................................................................................................................5

5. SCOPE OF SUPPLY ............................................................ ........................................................... ................6

5.1. M ECHANIZED BAR SCREEN 92SEO001DG.................................................................................................6

5.2. S EWAGE TANK (92SEO002BA) AND SEWAGE TRANSFER PUMPS (92SE003PO&SEO004PO) ......................6

5.3. P RIMARY SETTLING TANK (92SEO003BA).................................................................................................7

5.4. B IOLOGICAL TREATMENT ..........................................................................................................................8

5.5. S ECONDARY SETTLING TANK (92SEO005BA) ............................................................................................9

5.6. S LUDGE P UMPS ........................................................................................................................................9

5.7. UV DISINFECTION TREATMENT ................................................................................................................10

5.8. S LUDGE STORAGE AND STABILIZATION .....................................................................................................10

5.9. C ONTROL PANEL.....................................................................................................................................11

5.10. LOCAL STATION ......................................................................................................................................12

5.11. E LECTRIC CONNECTION AND PIPING ........................................................................................................12



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3. DESIGN BASIS

The sum of different effluents from the sewer shaft resulting in:

Average daily flow rate ...........................: 56 m3/d

Nominal buffered flow rate ...................... : 2,5 m3/h

Maximum instantaneous flow rate .......... : 50 m3/h

4.

TREATMENT PRINCIPLE

SEWAGESTORAGE

SCREENING

PRIMARYSETTLING

SECONDARYSETTLING

BIOLOGICALTREATMENT

2,5 m3/h

UVDESINFECTION

60 m3/d

DISCHARGE

25-50 m3/h

SLUDGESTORAGE

SEWER SHAFT



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5. SCOPE OF SUPPLY

5.1. Mechanized bar screen 92SEO001DG

. A mechanized bar screen (92SEO001DG) located at the inlet of sewage storage:

Type................................................: vertical rake

Flow rate.........................................: up to 50 m3/h

Total filtering surface area..............: 0,1 m2

Total width of filtration..................: 905 mm

Mesh spacing..................................: 5 mm

- Inlet screening channel

Material .................: civil works

- Frame attachmentMaterial .................: Stainless steel

- Travelling gantry

- One fixed screen :

Material ................... : Aluminium

Spacing ................... : 35×5 mm

Crossing coefficient. : 70 %

- Rakes:

Material ................... : Stainless steel

Spacing.................... : 10 mm

- Motorisation:

Torque limiter

Power....................... : 0,37 kW

Climbing speed........ : 2,5 m/min

. Screenings guide with one mobile container

. All necessary fittings

5.2. Sewage tank ( 92SEO002BA) and sewage transfer pumps (92SEO003PO&SEO004PO)

. One sewage tank (92SEO002BA) (out of scope)

Material ............................................ : civil works

Net capacity ...................................... : 50 m3

This tank is equipped:

. One mechanical mixer (92SEO001ZE)

Material ............................................ : Cast Iron

Type.................................................. : submersible

This mixer is equipped:-

Hoisting derrick



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. Two sewage transfer pumps (92SEO003PO & 92SEO004PO) :

Material .......................................... : Cast Iron

Type.................................................. : submersible

Flow rate......................................... : 2,5 m3/h

Those pumps are equipped:

-

Isolation valves and handling device

-

Check valve

- Four level detectors

-

Hoisting derrick

In order to avoid any overflow, each pump reaches the nominal flow rate. The pumps areworking in duty and standby.

5.3. Primary settling tank ( 92SEO003BA)

. One settling tank (92SEO003BA) (out of scope)

Nominal flow rate............................. : 3 m3/h


Type.................................................. : cylindroconical

Angle of conicity .............................. : 60°C

Settling area...................................... : 3,1 m2

Diameter ........................................... : 2,0 m

Cylindrical height ............................. : 2,0 m

Total volume..................................... : 8,1 m3

Cone volume..................................... : 1,8 m3

This clarifier is equipped:

- A clarified water launder

-


-

On low level detector

- All necessary fittings and valves for branch and flush connection



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5.4. Biological treatment

The type of biological technology used is a submerged fixed bed.

The bioreactor is divided into two stages in series

. One fixed bed bioreactor (92SEO004BA) (structure out of scope)


Building materials ............................ : civil works

Length (external) .............................. : 8 m (approximate)

Width (external) ............................... : 3,4 m (approximate)

Hydraulic volume of bioreactor........ : 53 m3

Total volume of structure ................. : 65 m3

This bioreactor is equipped:- Five media modules (92SEO001CQ to 005)

Material (support skid) ..................... : Stainless steel

Material (media) ............................... : Polypropylene

Surface area unit............................... : 640 m2/unit

- Two blowers (92SEO001ZV & 92SEO002ZV)

Type.................................................. : side channel blower double stage

Rated power...................................... : 5,5 kW

Rated hourly air flow........................ : 100 Nm3/h

Total available transfer capacity....... : 1,5 to 1,7 kgO2/kgDCO

Each blower is equipped:

- Inlet filter

- Check valve

- Safety valve

- Isolation valves and handling device

- A combined system of diffused air oxygenation

Material ............................................ : Stainless steel

Type.................................................. : one air delivery header

Collector diameter ............................ : 114,3 mm

The combined system is equipped:

- Condensate blow-down device

- Clogging indicator

- Lot of diffusers (92SEO001DK to 024) for combined system of diffused air oxygenation

Material ............................................ : E.P.D.M membrane

Water-proofing ................................. : neoprene O-ring seal

Diffusion length by unit ................... : 1000 mm



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5.5. Secondary settling tank ( 92SEO005BA)

The structure is half-buried and gravity feed biodegraded water into the final treatment.

An access stairway is planned to accede to a platform (flat roof) in order to observe the

clarifier overflow.

. One settling tank (92SEO005BA) (out of scope)



Type.................................................. : cylindroconical

Angle of conicity .............................. : 60°C

Settling area...................................... : 7 m2

Diameter ........................................... : 3,0 m

Cylindrical height ............................. : 1,5 m

Total volume..................................... : 17 m3

Cone volume..................................... : ~ 6 m3

This clarifier is equipped:

- A clarified water launder


- On low level detector

- All necessary fittings and valves for branch and flush connection

5.6. Sludge Pumps

The sludge pumping is shared by the two settling tank. The pumps are working in duty andstandby.

. Two sludge pumps (92SEO005PO & 92SEO006PO):

Material .......................................... : aluminium

Type.................................................. : pneumatic (diaphragm pump)

Flow rate........................................... : 2 m3/h

Those pumps are equipped:

-


- Pneumatic straight-through passage valve

-

Filter and pressure reducing valve

In order to empty the stabilization basin into a tank truck:

-

All necessary valves, fittings, and flexible hose connections.

. One air compressor (92SEO001CO) for pneumatic pumps and actuators:

Material .......................................... : Steel

Type.................................................. : lubricated piston machine

Flow rate........................................... : 15 m3/h

Pressure ............................................ : 8 bars

-


-

Pneumatic straight-through passage valve

-

Filter and pressure reducing valve



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5.7. UV disinfection treatment

.

One UV sterilizer (92SEO001SR):

Material .......................................... : Stainless steel

Material .......................................... : Two modules in series

Flow rate........................................... : 3 m3/h

It is equipped:

- Remote monitoring module


- Electromagnetic flowmeter with totalizing unit

.

Electromagnetic flowmeter with totalizing unit :. One treated water recovery hopper to sampling - Discharge tank (92SEO008BA)

5.8. Sludge storage and stabilization

The structure is buried with one low recovery point to empty the tank.

. One sludge stabilization tank (92SEO006BA) (out of scope)


Net capacity ...................................... : 30 m3

This tank is equipped:

-

A combined system of diffused air oxygenation

Material ............................................ : PVC

Type.................................................. : one air delivery header

Collector nominal diameter .............. : 100 mm

The combined system is equipped:

- Condensate blow-down device

- Clogging indicator

-

Lot of diffusers (92SEO025DK to 041) for combined system of diffused air oxygenationMaterial ............................................ : E.P.D.M membrane

Water-proofing ................................. : neoprene O-ring seal

Diffusion diameter by unit ............... : 12,6 mm



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5.9. Control panel

. The control cabinet is made of painted steel.

It includes:

- A general protection by a main isolating switch with indicating light

- Protection device of all motors (disconnecting switch, thermal relay, "on" light)

- Circuit breakers, fuses, push buttons, trigger switches, transformers

- One PLC

- Light test by diodes

- One audible alarm (klaxon)

Placed in front of the panel:

- A general protection by a main isolating switch with indicating light

- Message display

- Control knobs

. One uninterruptible power supply for:

- Instrumentation

- P.L.C

- 24V supply:

. P.L.C Input/Outpout

. signalling

. display

U.P.S Characteristics

Type.................................................. : on line

Autonomy......................................... : 10 min

Power................................................ : 1500 VA



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5.10. Local station

One building (out of scope)

Surface Area ..................................... : 24 m2


Length .......................................... : 6 m

External Width ................................. : 4 m

Efficient Height ................................ : 2.95 m

(Size to be validated with final arrangement drawings)

All equipments inside the room will be assembled on a skid:

Material ............................................ : painted steel

Shape ............................................... : rectangular

Length .......................................... : 3.5 m

Width................................................ : 1.2 m

Lifting devices.................................. : lifting ears or hooks

5.11. Electric connection and piping

. Hydraulic Connections of the skid’s equipments inside the local station:

- Painted steel pipes

- Flanges, pipe unions, brackets

. All materials needed for the equipments connections outside the local station:

Air network:

- From blowers to air diffusion network

- From compressor to air operated pumps and actuators

Air network:

- From settlings tanks to sludge stabilization tank

. Electrical Connections of the skid’s equipments inside the local station:

- Cables

- Cables trays

- Junction boxes



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- MATERIAL LIST -



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- GENERAL FUNCTION - PROCESS -



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TABLE OF CONTENTS

1. PURPOSE OF THE DOCUMENT ......................................................... ....................................................... 5

2. REFERENCE DOCUMENT .................................................... ................................................................ ......5

2.1. ASSOCIATED DOCUMENTS .........................................................................................................................5

3. LIST OF MAIN EQUIPMENTS AND ACTUATORS.................................................................................5

3.1. S EWAGE STORAGE AND LIFTING PUMPING STATION ....................................................................................5

3.2. P RIMARY SETTLING TANK (92SEO003BA).................................................................................................5

3.3. B IOLOGICAL TREATMENT ..........................................................................................................................5

3.4. S ECONDARY SETTLING TANK (92SEO005BA) ............................................................................................5

3.5. F INAL DISINFECTION OF TREATED EFFLUENTS ...........................................................................................5

3.6. S LUDGE STORAGE AND STABILIZATION (92SEO006BA) .............................................................................6

4. GENERAL DESCRIPTION OF THE SANITARY WASTE WATER TREATMENT............................6

4.1. S ANITARY WASTE WATER TREATMENT SYSTEM .............................................................................................6

4.2. C ABINET CONTROL....................................................................................................................................7

4.3. U NIT DISPLAY ...........................................................................................................................................8

4.4. F AULT TREATMENT – AUTOMATICALLY RESET ...........................................................................................11

4.5. F AULT TREATMENT – BY ACKNOWLEDGE PUSH BUTTON RESET ..................................................................12

5. SYSTEMS MANAGEMENT AND OPERATION PRINCIPLES ............................................................ 13

5.1. S EWAGE STORAGE AND LIFTING PUMPING STATION (92SEO002BA).........................................................13 5.1.1. M ECHANIZED BAR SCREEN (92SEO001DG) .................................................. ................................. 13 5.1.2. M ECHANICAL MIXER (92SEO001ZE) ................................................. ............................................ 15 5.1.3. S EWAGE TRANSFER PUMPS (92SEO003PO&92SEO004PO).......................................................... 16

5.2. P RIMARY SETTLING TANK 92SEO003BA..................................................................................................19

5.3. B IOLOGICAL TREATMENT 92SEO004BA..................................................................................................20

5.3.1. A IR BLOWERS (92SEO001ZV&92SEO002ZV)...............................................................................20

5.4. S ECONDARY SETTLING TANK (92SEO005BA) ..........................................................................................22

5.5. F INAL DISINFECTION OF TREATED EFFLUENTS .........................................................................................22

5.6. S LUDGE STORAGE AND STABILIZATION (92SEO006BA) ...........................................................................22 5.6.1. Principle....................................................... .................................................................. ..............22 5.6.2. Operator interfacing .............................................................. ...................................................... 23 5.6.3. AUTO MODE (selector switch 1 st position) ........................................................ ............................. 25 5.6.4. P RIMARY MODE (selector switch 2nd position) ............................................................ ...................28 5.6.5. S ECONDARY MODE (Selector switch 3rd position) .......................................................... ................30 5.6.6. S LUDGE MODE (Selector switch 4th position).................................................................................32

6. FAULT PROCESSING .................................................... .............................................................. ...............35

6.1. S EWAGE STORAGE AND LIFTING PUMPING STATION ..................................................................................36

6.2. P RIMARY SETTLING TANK (92SEO003BA)...............................................................................................39 6.3. B IOLOGICAL TREATMENT ........................................................................................................................40

6.4. S ECONDARY SETTLING TANK (92SEO005BA) ..........................................................................................41



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6.5. F INAL DISINFECTION OF TREATED EFFLUENTS .........................................................................................42

6.6. S LUDGE STORAGE AND STABILIZATION (92SEO006BA) ...........................................................................43



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1. PURPOSE OF THE DOCUMENT

The purpose of this document is to describe the general function, the main components, the control

principles and the interfaces to other systems of the sanitary waste water treatment plant to the

MEROWE DAM project.

2. REFERENCE DOCUMENT

2.1. Associated documents

AHS MRW 92 SEO MS 100 : TECHNICAL SPECIFICATION OF THE EQUIPMENTS

AHS MRW 92 SEO SP 101... : SWWT FLOW DIAGRAM

AHS MRW 92 SEO SP 102... : SWWT SEWAGE STORAGE & PRIMARY SETTLING DIAGRAM

AHS MRW 92 SEO SP 103... : SWWT BIOREACTOR & SLUDGE STABILIZATION DIAGRAM

AHS MRW 92 SEO SP 104... : SWWT SECONDARY SETTLING & FINAL TREATMENT SKID

DIAGRAM

3. LIST OF MAIN EQUIPMENTS AND ACTUATORS

3.1. Sewage storage and lifting pumping station

Mechanized bar screen .................................. : 92SEO001DG

Waste tank ..................................................... : 92SEO007BA

Sewage tank................................................... : 92SEO002BA

Sewage transfer pumps.................................. : 92SEO003PO

: 92SEO004PO

Mechanical mixer .......................................... : 92SEO001ZE

Level detectors .............................................. : 92SEO004SN (LL EL)

: 92SEO005SN (L EL)

: 92SEO006SN (H EL)

: 92SEO007SN (HH EL)

3.2. Primary settling tank (92SEO003BA)

Level detector ................................................ : 92SEO008SN (LL EL)

3.3. Biological treatment

Blowers.......................................................... : 92SEO001ZV

: 92SEO002ZV

053 VE Closed Limit switch ......................... : 92SEO001FC

3.4. Secondary settling tank (92SEO005BA)

Level detector ................................................ : 92SEO009SN (LL EL)

3.5.

Final disinfection of treated effluentsUV sterilizer .................................................. : 92SEO001SR

Electromagnetic flow meter .......................... : 92SEO001MD



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3.6. Sludge storage and stabilization (92SEO006BA)

Level sensor................................................... : 92SEO010SN (HH EL)

Air compressor .............................................. : 92SEO001CO

Pressure switch (for 92SEO005BA).............. : 92SEO002SP

Sludge pump (pneumatic) ............................. : 92SEO005PO

Control solenoid valve................................... : 92SEO002EL

Sludge pump (pneumatic) ............................. : 92SEO006PO


Pneumatic valves (for 92SEO005BA)........... : 92SEO058VE


Pneumatic valves (for 92SEO003BA)........... : 92SEO059VE


4. GENERAL DESCRIPTION OF THE SANITARY WASTE WATER TREATMENT

4.1. Sanitary waste water treatment system

The sanitary waste water treatment plant is fed by domestic sewage from a sewer shaft by

gravity, before discharge to river Nile.

The sewer shaft located 300 m to the sewage treatment plant is fed by:- sanitary wastewater originating from supporting facilities

- sanitary facilities of the administration and service collected in a primary sewage tank,

- filter backwash waste originating from the drinking water purification plant

- domestic sewage tank 00SEO001BA

The raw water is stored in the sewage tank (92SEO002BA).

The mechanized bar screen (92SEO001DG) located at the inlet of sewage tank remove bigger

solids from wastewater to prevent clogging of followed systems. The solids removed are

discharged into waste tank (92SEO007BA)

The effluents are mixed by the mechanical mixer (92SEO001ZE) located in the bottom of the

sewage tank. Two submergible pumps (92SEO003PO & 92SEO004PO) (one duty one standby) pump the wastewater into the primary settling tank (92SEO003BA).

The clarified wastewater flow out by gravity of primary settling tank to the fixed bed bioreactor

(92SEO004BA). After biological treatment, the secondary settling tank (92SEO005BA) received

the effluent by gravity.

The clarified water of the secondary settling tank is directed by gravity across the UV

disinfection treatment (U.V sterilizer 92SEO001SR) to the discharge tank (92SEO008BA). The

flow rate of treated effluent is measured and totalized by a flowmeter (92SEO 001 MD).

According to a specific cycle, the sludge of the both settling tank are extracted to the sludge

stabilization tank (92SEO006BA) by two pneumatic pumps (92SEO005PO & 92SEO006PO)

(one duty one standby) which are supplied by the compressor named 92SEO001CO.When the sludge stabilization tank is full of, an operator can launch the transfer of stabilized

sludge and empty the tank into a tank truck.



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The main components of the sanitary waste water treatment are:

- Sewage storage (Tank, submergible pumps, mechanical mixer)

- Primary settling tank (Tank, sensor)

-

Biological treatment (Tank, diffusers)

-

Secondary settling tank (Tank, sensor)-

Final disinfection of treated effluents (Flow meter, U.V Sterilizer)

-

Sludge storage and stabilization (Tank, diffusers, sensor, valves, pneumatic pumps)

4.2. Cabinet control

The sanitary waste water treatment plant is equipped with a cabinet control located in the SKID.

Its power supply 400VAC+N is coming from the power house, and sometimes it becomes in

load shedding mode. So during this moment every actuators of the sanitary waste treatment are

stopped.

When the power station will stop being in load shedding mode, actuators will restart with a

cascade connection to avoid overload.

The cabinet control is equipped too with an UPS (uninterruptible power supply).

Here the following circuits which are saved by the UPS:

-

PLC supply

-

Inputs PLC

- Unit display

- Instruments supply (Flow meter)

- Command

-

Telemonitoring

Push buttons, selector switches, indicator lights and a unit display are available on the cabinet

control panel to drive the installation.

Among other one, here the following general push buttons and lights indicators:

- White light indicator 92SEO005LA “400VAC POWER ON”

- White light indicator 92SEO006LA “230VAC POWER ON”

- White light indicator 92SEO007LA “UPS 230VAC CONTROL ON”

- Red push button Ø70 92SEO003BP “GENERAL EMERGENCY STOP” (Push-turn to

unlock)

- Red push button 92SEO005BP “GENERAL EMERGENCY STOP RESET”

- Red push button 92SEO006BP “MECHANIZED BAR SCREEN EMERGENCY STOP

RESET”

- Yellow push button 92SEO007BP “ACKNOWLEDGE FAULT”- Yellow push button 92SEO008BP “LIGHT TEST”

The right side of the cabinet control is equipped too:

- Green beacon 92SEO008LA “PLC IN RUN MODE”

- Yellow beacon 92SEO009LA “GENERAL ALARM”

Three information exchanges are available to the power house of the administration & service

building. Those informations are:

-

General faults waste water treatment plant

-

High high emergency level sewage tank (HH EL – 92SEO007SN recovered)

-

400 VAC Power supply off



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4.3. Unit display



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Description of the static function keys of the unit display

F1 : Home

F2 : Faults list

Note: In anyway to go out from the faults list display, the operator has to press the ESC

touch of the unit display.

F3 : Sewage storage and lifting pumping station

F4 : Spare

F5 : Biological treatment

F6 : Spare

F7 : Sludge storage and stabilization

F8 : Spare

F9 : Spare

F10 : Spare

F11 : Spare

F12 : Legend

DATE – TIME – 1/122_Tripped fault

Mechanize bar screen92SEO001DG

MEROWE DAM PROJECT AHS MRW92 SEO

WASTE WATERTREATMENT PLANT

SLUDGE Main Pump Selected

Auto Sludg.Extract.

Settling Tks Sludge Sludge Stabiliz.Tk

To Page F7-1

To Page F7-2

To Page F7-4

To Page F7-11

BIOLOGICAL TREATMENT Air Blower 1 001ZV

----

To Page F5-1

SEWAGE STORAGEBar Screen 001DG Sewage Pump 3&4PO

Sewage Tank Levels

To Page F3-1

To Page F3-4

To Page F3-5

LEGEND - PLC TIMEPV: PRESET VALUERV: RUNNING VALUE: Back Next:



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4.4. Fault treatment – automatically reset

Message on the unit display off

Start

New fault appears ?

Fault still présent ?

“ENTER” push on the unit display ?

Message blinking on the unit display

Red beacon blinking

n

END

o

o

n

o

Fault acknowledge push button AND

“ENTER” push unit display ?

o

Fault still present?

n

n

Actuator restartMessage on the unit display off

Yellow beacon off

END

n

o

Actuator restart

Yellow beacon off

Fault acknowledge push button ?n

o

Yellow beacon lightning

if fault acknowledge push button

Fixed message on the unit display

If “ENTER” push unit display



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4.5. Fault treatment – by acknowledge push button reset

Start

o

n

END

Fault acknowledge push button ?

Fault reset, actuator restartMessage on the unit display off

Yellow beacon off

Fault still présent ?

Red beacon lightningif fault acknowledge push button

Fault acknowledge push button AND“ENTER” push unit display ?

Message blinking on the unit display

Yellow beacon blinking

New fault appears ?

o

o

n

o

n

n

Fixed message on the unit displayIf “ENTER” push unit display



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5. SYSTEMS MANAGEMENT AND OPERATION PRINCIPLES

5.1. Sewage storage and lifting pumping station (92SEO002BA)

The sewage tank (92SEO002BA) is equipped with four level detectors

- One emergency low level 92SE0004SN (LL EL)

- One low elevation level 92SE0005SN (L EL)

- One high elevation level 92SE0006SN (H EL)

- One emergency high level 92SE0007SN (HH EL)

Those levels are used to put under slaving the mechanized bar screen (92SEO001DG), the two

submergible pumps (92SEO003PO & 92SEO004PO) and the mechanical mixer (92SEO001ZE).

5.1.1.

M ECHANIZED BAR SCREEN (92SEO001DG)

(92SEO001DG) located at the inlet of sewage tank remove bigger solids from wastewater

to prevent clogging of followed systems. The solids removed are discharged into waste

tank (92SEO007BA)

The rated power of the mechanized bar screen's motor is 1.1 KW on 400VAC.

Here the following control buttons placed on the door of the cabinet control:

- A three fixed positions red light selector switch « AUTO-0-MANUAL » named

92SEO001CL associated to the 92SEO001DG mechanized bar screen.

- A green push button “ON” named 92SEO001BP.

MANUAL MODE

This mode is independent of the levels switch of the sewage tank. The operator places the

selector switch on manual position, adjusts the operating time and pushes “ON” button.

The mechanized bar screen works continuously and depends on the adjustable operating time

selected by the operator on the display unit. The operating time is selected in minutes on two

digits according the following meantime: (1 >= T =< 15min).

When the mechanized bar screen works, his red selector switch light is lightning.

The mechanized bar screen is stopped with:

- Selector switch not in Manual position,

- Fault #1 & #4 cabinet control emergency stop,

- Fault #2 & #5 mechanized bar screen emergency stop,

- Fault #22 Tripped fault mechanized bar screen,

- End of the processing timer.



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AUTOMATICAL MODE

The operator places mechanized bar screen selector switch on the “AUTO” position

(92SEO001CL).

The mechanized bar screen is authorized to work as soon as the low elevation level (NB92ESO005SN) is recovered for 60 seconds. His operating cycle is adjustable from the

display unit.

The operator can adjust the operating time (T_ON) and the waiting time (T_OFF).

The operating time and waiting time are selected in minutes on two digits according the

following meantime: (0 >= T =< 60min).

When all the operating conditions are present, the operating cycle starts automatically on

the operating time (T_ON) and the red selector switch light of the mechanized bar screen is

lightning.

The mechanized bar screen cycle is stopped with:- Selector switch not in AUTO position,


- Fault #2 & #5 mechanized bar screen emergency stop,

- Fault #20 LL_EL sewage tank 92SEO004SN,

- Fault #22 Tripped fault mechanized bar screen,

- Low level sensor 92SEO005SN discovered.

DISPLAY UNIT

4 lines composed of 20 characters each.

BAR SCREEN 001DG

CYCLE PARAMETERSON PV:10mn RV:00mnOFF PV:30mn RV:00mnPage F3-2

To Page F3-1

BAR SCREEN 001DG MANUAL PARAMETERSON PV:15mn RV:00mn

--Page F3-3

To Page F3-1

BAR SCREEN 001DGCycle Parameters Manual Parameters

Page F3-1

To Page F3-2

To Page F3-3

To Page F3

From Page F3



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5.1.2. M ECHANICAL MIXER (92SEO001ZE)

A submergible mechanical mixer 92SEO001ZE equips the sewage tank.

The rated power of the mechanical mixer's motor is 1.5 kW on 400VAC.

An internal thermometer probe security detects high temperature. A fault is set and

displayed

The sewage tank 92SEO002BA will be always mixed. The aim is to avoid sludge

accumulation in the bottom of the tank. Sludge accumulation would be able to block the

sewage transfer pumps 92SEO003PO & 92SEO004PO.

Here the following control button placed on the door of the cabinet control:

- A three fixed red light selector switch « AUTO-0-MANUAL » named 92SEO002CL

associated to the 92SEO001ZE mechanical mixer.

MANUAL MODE

The light selector switch of the mechanical mixer is on MANUAL position.The mechanical mixer is working as long as the security level LL EL 92SEO004SN is

recovered; the red selector switch light is lightning.

The low emergency level 92SEO004SN is a hardware security.

When the low emergency level 92SEO004SN is discovered, a fault is set and displayed on the

display unit. Mechanical mixer is stopped. When the low emergency level 92SEO004SN is

once again recovered, the operator has to used the acknowledge fault push button to reset this

fault.

The mechanical mixer is stopped with:

- Its selector switch not in Manual position,


- Fault #20 low emergency level sewage tank 92SEO004SN,- Fault #27 tripped sewage mechanical mixer,

- Fault #28 thermometer probe motor sewage mechanical mixer.

AUTOMATICAL MODE

The light selector switch of the mechanical mixer is on AUTO position.

The mechanical mixer is enabled as soon as the low level 92SEO005SN is recovered for 60s.

It is disabled as soon as the low level 92SEO005SN is discovered.


When it is discovered, a fault is set and displayed on the display unit. The mechanical mixer is

stopped. When the low emergency level 92SEO004SN is once again recovered, the operator

has to used the acknowledge fault push button to reset this fault.

The mechanical mixer will restart when the low level 92SEO005SN has been recovered for

300s.

The mechanical mixer is stopped with:

- Its selector switch not in AUTO position,


- Fault #20 low emergency level sewage tank 92SEO004SN,

- Fault #27 tripped sewage mechanical mixer,

- Fault #28 thermometer probe motor sewage mechanical mixer.

DISPLAY UNIT

4 lines composed of 20 characters each.

Nothing special



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5.1.3. S EWAGE TRANSFER PUMPS (92SEO003PO&92SEO004PO)

A couple of submergible pumps 92SEO003PO & 92SEO004PO equip the sewage tank

(92SEO002BA).

The rated power of the sewage transfer pump's motor is 3.2 KW on 400VAC.An internal thermometer probe security detects high temperature. Faults are set and displayed.

Those transfer pumps (one duty one standby) pump the wastewater into the primary settling

tank (92SEO003BA).

Here the following control buttons placed on the door of the cabinet control:


92SEO003CL associated to the 92SEO003PO pump.


92SEO004CL associated to the 92SEO004PO pump.

MANUAL MODE

The operator has to avoid the manual mode. It is not the normal working.

It is used to drain off the sewage tank with the aim to realize a maintenance operation.

(Mechanical mixer, mechanized bar screen, pump…).

Most of conditions are still operational (just see below), they have right on the manual running

mode of the pumps, because the operator must not saturates the sludge stabilization or one of

the settling tanks.

Be careful: as possible the sewage pumping must not working as the mechanized bar screen is

not running and the mechanical mixer too.

The light selector switch of the pump selected by the operator is on MANUAL position.

The select pump is working as long as the security level 92SEO004SN is recovered, so the red

selector switch light is lightning.


When the low emergency level 92SEO004SN is discovered, a fault is set and displayed on the

display unit. Sewage pumping is stopped. When the low emergency level 92SEO004SN is

once again recovered, the operator have to used the acknowledge fault push button to reset this

fault.

Each sewage transfer pump is stopped with:

- Its selector switch not in manual position,


- Its tripped fault sewage pump #,

- Its thermometer probe motor fault sewage pump #,

- Fault #20 low emergency level sewage tank 92SEO004SN,

- Fault #52 Air blower #1 92SEO001ZV not running (and the “rescue” mode off),

- Fault #72 Output U.V sterilizer low flow,

- Fault #81 High level sludge stabilization for 20 hours.

- Fault #83 Air pressure compressor down for 24 hours.

- Fault #86 Sludge pumping off for 24 hours.



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AUTOMATICAL MODE

In the normal working, the selector switches of the 92SEO003PO & 92SEO004PO transfer

pumps are placed in AUTO position.

Those pumps are working one duty one standby. An automatic permutation of functioning of pumps is made in accordance with a working time (" 1/3-2/3 " of total time).

The main pump as it is called will work 4h (that is to say 2/3 of total time defined at 6h

At the end of 4h, automatic permutation on the “secondary” pump which will work 2h (that is

to say 1/3 of time) and so one, and so forth.

When the both selector switches of the sewage transfer pumps are positioned on « 0 », the

followed principle is initialized: none of selected pump as main pump and the time counters

1/3-2/3 are resetted.

As soon as a sewage transfer pump's selector switch is positioned on « AUTO », the

associated pump becomes the main pump.

There is an automatic permutation to the secondary pump on the main pump unavailability.

The sewage transfer pumping is enabled as soon as the high level 92SEO006SN is recovered.

The “main” pump starts if there are no faults. The

109.01_seo_operating manual_ sanitary waste treatment water system

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