anglian water services ltd. ingoldmells wastewater ... · sludge (ras) / surplus activated sludge...

Ingoldmells WwTW OMP 1

ANGLIAN WATER SERVICES LTD.

Ingoldmells Wastewater Treatment Works

Odour Management Plan

This document must be reviewed at intervals not exceeding 12 months

Revision Authors Date of Issue Comments

1.0 G. Waring, A Lamyman March 2013

1.1

1.2

1.3

1.4

1.5

2.0

2.1

2.2

7


CONTENTS

1 OVERVIEW .................................................................................................................................43

1.1 INTRODUCTION ...................................................................................................................... 43

1.2 ODOUR MANAGEMENT PLAN STRUCTURE ............................................................................... 54

1.3 OVERVIEW OF SITE OPERATIONS ............................................................................................ 65

2 SITE MANAGEMENT ...............................................................................................................97

2.1 MANAGEMENT STRUCTURE .................................................................................................... 97

2.2 ROLES AND RESPONSIBILITIES ................................................................................................ 97

2.3 TRAINING ............................................................................................................................. 108

3 ODOUR RISK ASSESSMENT ................................................................................................ 108

3.1 METHODOLOGY ................................................................................................................... 108

3.2 SUMMARY OF MAIN RISKS AND CONTROLS ........................................................................... 108

4 CONTROL MEASURES ........................................................................................................ 1310

4.1 MANAGEMENT OF ODOROUS MATERIALS & PROCESSES ..................................................... 1310

4.2 PRO-ACTIVE MANAGEMENT ............................................................................................... 1311

4.3 REACTIVE MANAGEMENT .................................................................................................. 1512

4.4 CONTINGENCY AND EMERGENCY PLANNING ..................................................................... 1613

5 MONITORING PROCEDURES ........................................................................................... 1815

5.1 MONITORING OF ODOURS ................................................................................................... 1815

5.2 COMPLAINT MANAGEMENT ............................................................................................... 1615

5.3 COMMUNITY ENGAGEMENT .............................................................................................. 1615

6 ODOUR RISK ASSESSMENT .............................................................................................. 1916

7 WORKS TECHNICIANS ROUTINE OCU ACTIVITY SHEET ...................................... 2420

Page 18


8 SUMMARY OF RECENT AND FUTURE ODOUR IMPROVEMENT WORKS .......... 2622

Page 19

Ingoldmells WwTW OMP

4

1O

verv

iew

1.1

Introd

uctio

n

The Anglian Water site at Ingoldmells is located at:

Ingoldmells Wastewater Treatment Works

Boltons Lane

Ingoldmells

Lincolnshire

PE25 1JJ

Grid Reference: TM 5595 6767

The Ingoldmells catchm

ent, that is the area draining to the Ingoldmells Sewage Treatment Works Sea Outfall, covers an extensive area comprising a large section of the Lincolnshire holiday coast including

Skegness, Ingoldmells, Chapel St. Leonards and Anderby Creek, together with a number of widely separated inland villages, namely Addlethorpe, Burgh le Marsh, Hogsthorpe, Huttoft, Orby, Mum

by, Willoughby,

and part of Croft (Croft Lomax).

The catchm

ent serves an approximate total resident population of 31,931 however the resident population is increases to approximately 58,533 during the holiday season. The site has a split consent to reflect

this, for the summer period the consent for full flow to treatment is 550l/s and during the winter period the consent is 300l/s.

Ingo

ldm

ells

Ww

TW

Page 20


5

An annotated plan of the WwTW is shown below:

InletWorks

SAS

Tank

Primary

Tank2

Primary

Tank3

Primary

Tank1

FianlSettlement

Tank3

Final

Settlement

Tank1

Final

Settlement

Tank2

Sludge

Thicke

ners

Sludge

Blending

Tank

Storm

Tank

Garages

Storm

well

outfallstation

GeneratorNo2

Fuelstorage

Inlet

well

Oldworks

Usedfor

storage

LowLevel

PS

AerationDitchs

Aeration

BlowerUnit

Wash

Water

BoosterSt

CIFUnit

Storm

wells

Distribution

Chamber

Genyno1

InletpumpSt

Foul&Storm

Pumps

Office

SludgeTreatm

entCentre

ConveyerTankerBay

Sludge

Centrifugies

ControlRoom

&Lab

Chemical

dosingunit

Odour

Control

Unit

IngoldmellsGeneralLayout

SludgePumps

F/T

Distribution

Chambers

Primary

Distribution

Chamber

Sludge

Pumps

Reaeration

3

Aeration

2

Aeration

1

Workshop

Store

Wash

Water

PumpSt

Workshop

ElecMain

Incomer

Septic

Waste

Odour Suppression sprays

1.2

Odo

ur m

anag

emen

t pl

an s

truc

ture

The OMP outline the managem

ent system

s in place to ensure comprehensive and coherent managem

ent of odour issues on the Ingoldmells site. They outline the procedures for odour monitoring, dealing with

complaints and guidelines to ensure a common approach to resolving odour problems

This OMP follows the following structure:

Overview of operations.

Page 21


6

Managem

ent structure and responsibilities.

Identification of potential sources of odours.

Identification of potential receptors.

Assessm

ent of risk associated with these sources.

Control measures required to prevent / minimise the risks.

Contingency / em

ergency planning.

Monitoring procedures to assess the effectiveness of control measures

Com

plaints managem

ent procedure.

Record keeping

1.3

Ove

rvie

w o

f si

te O

pera

tions

Pre

limin

ary

Tre

atm

ent

Flows are received from

eight rising mains from

terminal pumping stations, some additional flows are pumped into the raw sewage wet well and subsequently pumped up to the Headworks.

Once at the headworks flows pass through the 2 detritors and then on to drum

screens where the incoming sewage is screened to remove plastics and rags into a skip for disposal, following maceration and

dewatering.

The first stage of preliminary treatment is via the detritors which slow down the sewage to settle out heavy the particles like grit and sand which is removed from

tanks into grit skip before disposal to land.

Skips are em

ptied weekly by a contracted disposal firm.

Prim

ary

Tre

atm

ent

After leaving the Headworks the flows then move on to the primary distribution cham

ber where it mixes with the return liquors from

the sludge thickening operation. There are three primary radial flow settlem

ent

tanks. Suspended solids are removed intermittently using auto desludging to prevent the build up of sludge in the tanks. The solids then are pumped up to the sludge blending tank, this de-sludging operation

has a potential to be an intermittent source of odour.

Page 22


7

Sec

onda

ry T

reat

men

t

After settlem

ent in the primary tanks the flow is pumped up to the activated sludge plant where it mixes with RAS in a selector zone before passing forward onto three activated sludge lanes running in parallel.

Fin

al S

ettle

men

t

The flow from

the activated sludge plant is passed through a distribution cham

ber onto three radial flow final settlem

ent tanks where polyelectrolyte is added to aid settlem

ent. Final effluent passes through the

sample point cham

ber onto the Final effluent pumps which direct flow down the long sea outfall to the North Sea. The settled solids from

the Final Settlement Tanks are collected in the Returned Activated

Sludge (RAS) / Surplus Activated Sludge (SAS) well where a proportion is returned to the Activated Sludge Plant and the remainder pumped to the Surplus Activated Sludge holding tank

Slu

dge

Tre

atm

ent Pro

cess

The SAS removed from

the bottom of the final tanks is initially stored in the SAS tank where it is then pumped through two drum

thickeners before being mixed with primary sludge in the sludge blending tank.

From the blending tank the blended sludge goes though a macerator before being pumped to the centrifuges for dewatering. The centrifuged cake is then collected in trailers ready for removal off-site to Canwick

STC for lime treatment.

Odo

ur c

ontrol

The main sources of odour are currently treated with odour suppression sprays, the location of the spray units are detailed in the annotated plan above.

Fut

ure

Odo

ur C

ontrol

Page 23


8

If required, options to further improve the odour control at the STW are currently being evaluated. These may involve the extraction of odourous gases from identified hot spots on the site and/or the chem

ical

dosing of returned liquors on the STW.

The improved process would be scheduled for installation in 2013/14

Page 24


9

2 Site

man

agem

ent

2.1

Man

agem

ent st

ruct

ure

Ingoldmells STW is part of Anglian Water’s Lincolnshire catchm

ent. The managem

ent structure in relation to Ingoldmells STW is shown below:

2.

2 R

oles

and

res

pons

ibili

ties

Ingoldmells STW is managed by a site based Treatment Manager and a permanent staff of Process Controllers and two Process Optimisers (Works Technicians).

Technicians are responsible for ensuring all assets associated with effective operation of the site are operating correctly and are also responsible for minor maintenance. Works technicians are also responsible for

clearing up accidental spillages of materials which could give rise to odours if left.

In addition

to the

site based

staff, a

team

of electricians and

fitters under a

Maintenance Contract Manager carry out electrical and mechanical maintenance. Planned inspections of plant and machinery are

carried out

The site managers are responsible for ensuring adequate communications are maintained with personnel responsible for other plants and services which impact on the treatment process, and ensure that necessary

measures are taken to resolve operational problems impacting Ingoldmells STW.

Catc

hm

en

Manage

r

Ta

ctica

l S

up

po

rtM

anage

rT

reatm

en

Manage

r

Work

s

Technic

ians

–P

roce

ss

Op

tim

ise

r X

2

Work

s

Technic

ians

–P

roce

sC

ontr

olle

rsx11

Str

ate

gic

Waste

Pla

nne

Main

tenance

Co

ntr

acto

rM

anage

r

Opera

tional

Managem

ent

Centr

(OM

C)

Page 25


10

2.3

Tra

inin

g

All staff have received sufficient training appropriate to their role as summarised below

Job

Rol

e N

umbe

r of

staf

f

Tra

inin

g

Com

plet

ed

DA

TE

Fut

ure

Tra

inin

g

Nee

ds

DA

TE

Tre

atm

ent

Man

ager

1 CoTC – 4TMNH

LTO – License

to Manage

2002

2010

. OCU

manufacturers

training

2014

Pro

cess

Opt

imis

er

2

Licence to

Operate

Pre

2012

OCU

manufacturers

training

2014

Pro

cess

Con

trol

ler

12

Sludge

Treatment

(HACCP) PQ

Licence to

Operate

Pre

2012

OCU

manufacturers

training.

2014

3 O

dour

ris

k as

sess

men

t

3.1

Met

hodo

logy

An odour risk assessment was completed for the site. The purpose of the assessment is to identify potential sources of odour and the receptors, to quantify the risk associated with the odour source and the

managem

ent controls required to minimise this risk.

3.2

Sum

mar

y of

mai

n risk

s an

d co

ntro

ls

All stages of the STW have been identified as potential sources of odour. The main odour risk sources are:

Inlet works – off site pumping station discharges

Storm tanks

Screenings handling.

Prim

ary tanks and de-sludge wells.

Page 26


11

Odour suppressions sprays have been installed at key locations to minimise the potential for odour nuisance. Onsite locations of odour suppression sprays are:

Inlet system

Splitting cham

bers on the primary settlem

ent tank

Sludge storage tank

Gravity inlet sewer

Septic waste imports

Wastewater treatment processes all have the potential to em

it odours. The design of the plant enables the processes to be operated in a way to minimise odour em

issions. However, under conditions where the

wastewater or sludge becomes anaerobic, eg during storage, this may not be possible, and containm

ent and reduction facilities may be required.

The stages of wastewater treatment identified as being potential sources of odour at Ingoldmells STW are included in the materials inventory.

The Odour risk assessment is presented in Section 7.

Mat

eria

ls Inv

ento

ry

The following table comprises the inventory of odorous materials at the WwTW site.

Pot

entia

l O

dour

Sou

rce

Cur

rent

con

trol

mea

sure

s

Inle

t w

orks

– o

ff s

ite p

umpi

ng s

tatio

n

disc

harg

es

Pum

p stations currently being dosed are:

Skegness Richm

ond Drive

Skegness Churchill Avenue

Burgh le Marsh Storeys Lane

Chapel St Leonards TPS

Ingoldmells The Haven TPS

Som

e of the outlying pumping station have

odour control chem

ical dosed as result of

septicity being identified within the immediate

catchm

ent. Odour dosing equipm

ent is

maintained by a specialist contractor

Priva

te d

rain

age

netw

orks

The catchm

ent has a distinct propensity

for high levels of septicity to be

generated within private sewers

connecting caravan parks and other

commercial prem

ises with the public

sewer network.

AW are working with EHO to compile a list

of private sewage pumping stations to assist

in evaluating the potential for septicity

generated within private networks

Inle

t w

orks

– s

eptic

tan

ker

disc

harg

e po

int

Potential odour release from

tankers

Signage on site – pictorial format

Duty of care sheets which enable site to

Page 27


12

Pot

entia

l O

dour

Sou

rce

Cur

rent

con

trol

mea

sure

s

when discharging

monitor imports

Weighbridge

Odour suppression spays are fitted with

motion sensors

Inle

t W

orks

There is a potential for odours at the

skip area if the screens or compactors

fail.

Skips are changed as required or when full

to minimise odours

Routine Activities are carried out at the inlet

as planned

Inlet screen faults have alarm points on

telemetry

Prim

ary

Tan

ks

The surface of the primary tanks is a

significant odour source when the tanks

are operating with high levels of

retained sludge.

Prim

ary tank sludge depths recorded weekly.

Autom

atic desludging of primary tanks

Prim

ary

Tan

k D

e-sl

udge

Cha

mbe

rs

Intermittent odour source when auto-

desludging takes place.

Desludge cham

bers are covered

Act

ivat

ed S

ludg

e (A

S) Pla

nt Potential

odour from

stripping residual septicity at

head of AS plant.

Maintain minimum

loading on AS plant

MLSS optim

um below 3000 mg/l. Max

5000 mg/l.

Fin

al S

ettle

men

t

Layer of sludge on surface can

intermittently cause odours

Autom

atic desludging of final tanks

Slu

dge

trea

tmen

t pr

oces

s

Potential odour release from

processing

of sludge

Sludge tanks are covered

Any spillages are dealt with as detailed in

section 3.2

Sto

rm T

anks

Potential for odour generation when

emptied.

Odour eradicated through using cleaning

pumps in tanks, floor washed during cleaning

cycle

Old

Sto

rm S

ettle

men

t Tan

k. Potential

odour generation from

sludge settlem

ent.

Rem

ove odour potential by keeping tank

empty and clean.

Iden

tific

atio

n of

rec

epto

rs

Page 28


13

The main receptors for odour are within the vicinity of Ingoldmells STW and are located at

Residential properties High Street, Ingoldmells

Residential properties at Windsor Crescent

Residential properties at Festival Avenue

Residential properties and Medical Centre on Skegness Road, Ingoldmells.

Caravan Parks / Holiday Cam

ps

4C

ON

TR

OL M

EA

SU

RES

4.1

Man

agem

ent of

odo

rous

mat

eria

ls &

pro

cess

es

Odorous materials can be managed in two distinct ways:

Pro-active managem

ent

Reactive managem

ent

Pro-active managem

ent concentrates on routine measures to minimise odour em

issions by good practice in the operation of the processes on site.

Reactive managem

ent of odour em

issions is the activity taken to reduce odour em

issions when a potential em

ission to atmosphere is identified.

At the STW, It is not possible for the site operators to divert incoming sewage away from

the site if there is a problem. It is therefore essential for the treatment processes on site to remain operational at all

times.

4.2

Pro

-ac

tive

man

agem

ent

Good house keeping plays an essential part in reducing odour em

issions from

the site. Site operators perform daily site inspections to ensure there are no spillages from

tanks. Any spillages are to be cleaned

up as soon as possible. Tanks that have been taken out of service must be kept em

pty and clean to avoid odour.

All Works Technicians at Ingoldmells STW

have a

responsibility

to maintain

good housekeeping and

clear spillages at the

earliest opportunity to prevent unnecessary odour. Anglian

Water has a

purchase

agreem

ent which is managed by RTS who can provide additional clean up services at short notice. Works Technicians have been given specific authority for out-of-hours contract.

Page 29


14

Key areas at risk from

spillage and control measures.

The key areas at risk from

spillage and associated control measures are as follows:

Com

pactor/screen area.

Works Technicians to maintain good house keeping and hose down any spillages. Also prom

pt action is required if any part of the plant breaks down

RAM pumps (Prim

ary Settlement Tanks)

Works Technicians to maintain good house keeping and hose down any spillages. Also prom

pt action is required if any part of the plant breaks down

Sludge building

Works Technicians to maintain good house keeping and hose down any spillages

Septic discharge point

Motion sensors are installed which activates odour suppression spays when a tanker passes through sensor.

Daily inspections by site operators

Routine site inspections by Treatment Manager - a minimum

of once per month.

Works Technicians day-to-day schedules are managed by the OMC to ensure that sickness and holidays are managed centrally across all sites and critical activities are given the highest priority. The system

implem

ented allows for one technician to be on site during working hours and call upon a second resource if required. Out of hours there is always a standby technician to respond to any breakdowns and this

allows coverage 365 days.

Page 30


15

Scheduled daily jobs include the routine operational maintenance and monitoring of all odour abatem

ent equipm

ent. Odour abatem

ent equipm

ent is maintained by site staff in accordance with suppliers’ instructions.

Additional maintenance beyond the scope of site staff is scheduled as part of the Ingoldmells maintenance plan and instructions are passed to maintenance staff via the ‘Click’ system

. ‘Click’ is a computer

based scheduling system

that deploys work directly to Works Technicians laptops and records jobs completed onto a central SAP work managem

ent system

.

4.3

Rea

ctiv

e M

anag

emen

t

Con

trol

of se

ptic

ity in

the

risi

ng m

ains

Following an extensive catchm

ent survey Nitrate dosing has been implem

ented in those incoming sewers with particular odour issues to limit septicity. Dosing is controlled on a flow and temperature basis to

ensure an optim

um dosing is maintained especially during hot weather conditions.

There are

seven

rising

mains from

pump

stations and

a gravity sewer that transfer sewage

to the

Ingoldmells STW. Three of these

rising

mains have been identified

as causing

septicity. The sites are

Skegness Richm

ond Drive (SKRISM) Skegness Churchill Avenue (SKCHSM) and Chapel St Leonards Old Works (CHWOSM). All 3 sites discharge in to the inlet headworks onsite at Ingoldmells STW.

Skegness Churchill Avenue: RM length 3350m.

Estimated DWF: 900 cu.m

Skegness Richm

ond Drive: RM length 5,500m.

Estimated DWF: 3,700 cu.m

Chapel St Leonards Old Works: RM length 4,716m.

Estimated DWF:1,100 cu.m

In the Ingoldmells catchm

ent, with virtually no gravity sewers, septicity will develop in the rising mains overnight as the outlying pumping stations do not have enough incoming flow between midnight and 7:00 am

to pump the volume of the rising main. This applies equally to the outlying pump stations as it does to the individual pumping stations on many of the holiday parks. This is then compounded by further

pumping the sewage for several thousand meters a process taking several hours, to the works.

Des

ludg

ing

of the

prim

ary

settle

men

t ta

nks

In the operational tanks available for duty the de-sludging is managed to limit the retention tim

e of sludge in each tank therefore minimising the potential for septicity.

This is achieved by desludging the tanks regularly on a daily basis to maintain the sludge blanket level at an optim

um level across all tanks.

Page 31


16

Prim

ary tanks are also dipped periodically by Works Technicians to measure the blanket depth.

Cle

anin

g of

the

sto

rm tan

ks

When the storm tanks have been used, the storm water will be returned for treatment at the earliest opportunity.

During the em

ptying process mixers are automatically activated to ensure settled residues are lifted into the returned storm water, thereby minimising residual solids in the tank and potential for odour em

issions.

Oth

er

Should elevated odour em

issions be identified by operators or complaints received, investigation into the source of the odour will be conducted.

4.4

Con

tinge

ncy

and

Em

erge

ncy

Pla

nnin

g

Bre

akdo

wns

In the event of a breakdown the responsible person creates a job which is then raised via Anglian Water’s Operational Managem

ent Centre (OMC). The response tim

e for remedying breakdowns is dependant

upon the criticality of the plant, response codes are:

A0

Within 1 hour.

A1

Within 4 hours.

A2

Within 1 day.

A3

Next day.

A4

Next 2 days.

Critical plant has been identified and given the appropriate priority. Jobs are allocated by the OMC via our electronic scheduling tool, ‘Click’. This identifies an appropriately qualified person who is able to

respond within the tim

escales determined by the response code.

The site holds many spares for key equipm

ent and framework arrangem

ents are in place for critical plant including lead tim

es for delivery to site. In addition, maintenance contracts are in place with many

suppliers and include the requirement for them

to store spares on Anglian Water’s behalf.

Flo

od, Fire

and

Ext

rem

e w

eath

er.

Hot and dry weather is likely to increase odour em

issions by increasing evaporation rates, reducing dispersion when wind is low and increasing the residence tim

es in the sewers leading to increased septicity and

odour em

issions. Heavy rain after dry weather will produce a first flush of strong sewage likely to cause odour at the inlet works as well as overflowing to the storm tanks where raw sewage can be stored for

some tim

e. It is therefore essential that the inlet works and storm tanks are managed closely to avoid odour nuisance during changing or extrem

e weather conditions.

Page 32


17

Problem

atic sewers have been identified and Nitrate dosing installed to mitigate the effect of septicity during hot and dry weather conditions. An H2S monitor at the inlet works continuously monitors the efficiency

of the system

, allowing the operators to make adjustments to the system

and identify other potentially problematic areas. The readings and outcom

es are reviewed on a monthly basis to ensure the continued

success of the mitigation measures and identify other potential measures that may be required. The storm flows that accumulate in the storm tanks are returned to the inlet works for treatment in the WwTW as

soon as flows permit and the storm tanks will be cleaned after em

ptying to ensure odour em

issions from

residues are minimised.

Freezing can prevent the operation of valves, pumps and other equipm

ent leading to sludge build-up in the process. Trace heating/lagging is installed on critical plant to ensure continued operation through the

winter months. Snow fall or frozen roads can also limit access to the site limiting chem

ical deliveries. Should there be a need a contractor proactively grits access roads to site which ensures continued access

during cold weather.

Pow

er fai

lure

The site at Ingoldmells is equipped with two backup generators to run the site in case of a major power failure.

If necessary, Anglian Water also has a contract in place for hiring mobile generators at short notice.

Abn

orm

al o

pera

tion/

Con

stru

ctio

n

Any planned construction of a certain size on site will meet the requirements of CDM Regulations 2007. Such new works will require a Pre-Construction Site Managem

ent Plan which will be developed to cover

the

construction

and

commissioning

period

of proposed works. The strategy/plan will be continually reviewed in line

with site conditions

to ensure that the

process

capabilities

of the

works will not be

comprom

ised. Under the agreed delivery model, construction and commissioning gateway governance shall be completed and approved by key stakeholders, which includes the Operational Treatment Manager. The

document covers managem

ent of environm

ental impacts of the construction, including how odour is to be managed and minimised while work on site is on-going.

In the event that an activity is assessed as a medium or high risk of odour nuisance the activity shall be undertaken under an impact plan. Impact Plans are used by AWS to manage non routine activities that

have the

potential to impact on works compliance, health & safety and

custom

ers. The plan is designed to ensure appropriate controls, mitigation

and

communication

procedures have been identified

and

are

followed appropriate to the task. Such exam

ples where odour risk is identified and an impact plan is required, mitigation actions may include:-

Revised construction sequence and commissioning activities that shall reduce / remove odour generation

Revised commissioning sequence

Utilisation of existing odour control equipm

ent, possible extension via temp measures to accommodate additional areas

Provision of temporary odour reduction plant

Enabling new odour managem

ent plant earlier within construction programme

Provision of temporary sufficient spray system

s to mask odour.

The Regulators will be made aware of any event which may lead to a risk or temporary increase in odour, the mitigation measures put in place and tim

e scales for the work to be undertaken.

Page 33


18

5M

onito

ring

pro

cedu

res

5.1

Mon

itoring

of od

ours

Monitoring of odours will be a combined effort by all site managers and site staff. All staff are expected to:

Ensure provision of Nutriox dosing in the network to reduce septicity in the influent wastewater.

Weekly check of primary sludge depth and desludging of PSTs.

Good house keeping including tim

ely cleanup of spillages.

Operation and monitoring of performance of odour suppression sprays.

Routine monitoring of sniff tests are carried out in areas around the site and close to potential receptors as identified

If an odour is detected on site, sources will be investigated on all sites to determine the source. If the source can be identified, actions will be taken to stop odour generation or stop the activity responsible.

If the activity cannot be stopped immediately for operational reasons, the Regulators will be informed, with a tim

e scale to affect a permanent solution.

A record is also maintained of any known off-site activities that may have an impact on odour, such as agricultural practices. This consists of an entry in the site log book showing relevant tim

e and date.

Inline Hydrogen sulphide monitors are installed at the inlet of the STW, this allows continuous monitoring and feedback to the Maintenance team

s as to the efficacy of the septicity dosing in the catchm

ent and

allows proactive adjustments to be made.

5.2

Com

plai

nt M

anag

emen

t

We receive odour complaints verbally, by em

ail, by letter or by the odour cards that we have issued to the residents. We will always acknowledge the complaint and respond to the custom

er, if needs be we

send a field technician or the CLM

may visit the custom

er. Any complaints made verbally through our call centre, by letter or by em

ail are recorded on SAP. If an odour card is sent back to us, we send a

new odour card back to the custom

er to acknowledge receipt of their feedback. Any issues are logged on a spreadsheet and this reviewed on a weekly basis.

5.3

Com

mun

ity E

ngag

emen

t The Rem

arkables, a public relations company, has been contracted to arrange pro-active public meetings and facilitate between the site and the public. This work will aim to:

Improve awareness of the improvem

ents to the works

Engage directly with local representatives to ensure a good understanding

Engage directly with residents to ensure they understand the investment / improvem

ent and also discuss in detail – on a one to one basis – any issues they may have regarding odour

Keep residents informed in the longer term

Ensure there is a forum for involvem

ent in the longer term

Assist AWS in mapping complaints and trends in complaints history

Page 34


19

5.3

Fut

ure

impr

oved

Mon

itoring

The provision of a weather station is planned in 2013 / 14 to provide the following information

Atmospheric pressure.

Tem

perature.

Hum

idity.

Wind speed and direction.

Rainfall.

Wind direction will be considered before any non routine work likely to cause odour is carried out. The weather station data will also be used to investigate odour complaints or to determine the source of

odours during weekly sniff testing by site staff.

6O

dour

Ris

k A

sses

smen

t

Pot

entia

l O

dour

Sou

rce

Cur

rent

con

trol

mea

sure

s Fut

ure

Pro

posa

ls

Dat

e

Doc

umen

ts

All

of T

reat

men

t

Wor

ks

Com

mission specialist odour mapping

survey, to identify any odour hot spots

on Treatment Works

Identify and implem

ent odour control

solutions following odour mapping

survey

Ongoing investigation within the

catchm

ent where we dose into

strategic pumping stations to inhibit the

formation of septicity

Olfactom

etry analysis required to enable full

dispersion model run. Analysis is scheduled for

April to better represent warmer temperatures and

seasonal load. May allow for targeted investigation

of any subsequent odour complaints

April 2013

Inle

t w

orks

off s

ite

pum

ping

sta

tion

disc

harg

es

Pum

p stations currently dosed are

Skegness Richm

ond Drive, Skegness

Churchill Avenue and Chapel St

Leonards TPS

Continuous H2S measurement, data used to

optim

ise dosing rates.

There has been some suggestion the operation of

Page 35


20

Pot

entia

l O

dour

Sou

rce

Cur

rent

con

trol

mea

sure

s Fut

ure

Pro

posa

ls

Dat

e

Doc

umen

ts

Ingoldmells Festival Avenue is causing odours to

vent near a property, possibly aggravated by high

water levels in the sewer – Further investigation is

required pending CCTV and hydraulic model output

Inle

t w

orks

-

sept

ic tan

ker

disc

harg

e po

int

Potential odour

release from

tankers when

loading.

Signage on site – pictorial format

Duty of care sheets which enable site

to monitor imports

Weighbridge

Odour suppression sprays are fitted

with a motion sensors

Odour logging indicates the septicity of the

combined imports when discharged at the inlet

reception is not significant. This would suggest

that reducing dispersion at the import cham

ber may

significantly reduce odour em

issions from

this point.

Modifications to the import cham

ber to be

considered.

Inle

t Scr

een

-

Fin

e

There is the

potential for

odours at the

skip area if the

screens or

compactor fails or

if there is an

increase in FOG

from

the

catchm

ent.

Skips are changed as required to

minimise odours or when full

Routine Activities are carried out at

the inlet as planned.

Inlet screen faults have alarm points

on Telem

etry.

Provision of new screenings and handling system

–

has been installed

Initiation of new FOG program centering on

Caravan Parks

Hea

dwor

ks

H2S that may be

present in the

Routine Activities are carried out at

the inlet as planned.

Installation of odour suppression

Page 36


21

Pot

entia

l O

dour

Sou

rce

Cur

rent

con

trol

mea

sure

s Fut

ure

Pro

posa

ls

Dat

e

Doc

umen

ts

incoming sewage

from

the rising

mains

sprays

Provision of new screenings and

handling system

has been installed

which help prevent blockages and

odour

Prim

ary

trea

tmen

t

Sludge Blanket Detector and rotation

alarms

Autom

atic desludge of primary tanks

Desludge cham

bers are covered

Prim

ary

Tan

k D

e-

slud

ge C

ham

bers

Desludge cham

bers are covered

Act

ivat

ed S

ludg

e

(AS) Pla

nt

Activated sludge

plants- little

potential odour

Hi and Low Do alarms

Routine maintenance regime for RAS

and SAS removal

Maintain mixed liquors for optim

um

performance

Fin

al S

ettle

men

t

Layer of sludge

on surface can

intermittently

cause odours

Polyelectrolyte is added to aid final

settlem

ent

Autom

atic desluding

Chambers are covered

On going reduction of polymer following

optim

isation of the process

Sur

plus

act

ivat

ed

slud

ge

Has a high well alarm point linked to

telemetry

Page 37


22

Pot

entia

l O

dour

Sou

rce

Cur

rent

con

trol

mea

sure

s Fut

ure

Pro

posa

ls

Dat

e

Doc

umen

ts

Slu

dge

trea

tmen

t

proc

esse

s

High sludge tank alarm point is linked

to telemetry.

Final commission of new sludge tank

removing the need to use open top

sludge storage tanks

Any spillages to be wash down as

necessary

August 2012

Dru

m T

hick

ener

s

Potential odour

release from

processing of

sludge.

Drum thickeners faults have alarm

points on telemetry

Cen

trifu

ges

Potential odour

from

hydrogen

sulphide release

during operation

and from

centrate

produced during

dewatering

process.

If odours occur to assess centrate in

the liquor well

Inside vented building

Forthcoming installation of the strain press will

create a significant release point for sludge related

odours. Dosing centrate upstream

of the PST

distribution could significantly reduce H2S released

in the sludge process

April / May

2013

Tan

kering

aw

ay o

f

slud

ge

Centrifuge cake is transferred to a

trailer inside building; truck is covered

with tarpaulin before leaving site.

Sto

rm tan

ks

Empties back to works after storm

event

Instigate cleaning of storm tanks

Cleaning of the storm tanks is activated

automatically

July 2011

Page 38


23

Page 39


A-24

7W

orks

Tec

hnic

ians

Rou

tine

activ

ity s

heet

Page 40


A-25

Page 41

Ingoldmells WwTW OMP A-26

8 Summary of Recent and Future Odour Improvement Works

Summary of recent works undertaken to reduce odour at Ingoldmells WwTW

Item Works undertaken Status Comment

Control of

septicity in

rising mains

Improved management of Nitrate dosing

by profiling and seasonal adjustment to

further optimise the dosing.

On-going Loggers positioned as

inlet to indicate

septicity within the

sewage network.

Enables contractor to

adjust dosing.

Headworks

corrosion with

risk of odour

Provision of new screenings and

handling system has been installed

which help prevent blockages and

odour

Completed

Sludge Tanks Final commission of new sludge tank

removing the need to use open top

sludge storage tanks

Completed

Odour control Installation of new odour control system

which is maintained by a specialist

contractor

On-going Staff availability has

previously been an

issue but this has

improved due to

better training of staff

and a high priority

being given to this

task.

Page 42

Ingoldmells WwTW OMP A-27

Summary of proposed works to be undertaken to reduce odour at Ingoldmells WwTW

Item Works Proposed Date for implementation

Private

drainage

Network

The catchment has a number of private

pumping stations which discharge into the

catchment from holiday accommodation –

these are dormant in the close season.

AWS to work with the EHO, who will

compile a list of private pump stations.

AWS need to ensure these systems are

flushed though at the end of the

operating season to contain septicity

Pending confirmation from EHO

on the number of private pump

station. AWS will need to

review resource and cost

Odour Control

at Sludge

Treatment

Forthcoming installation of the strain

press will create a significant release

point for sludge related odours. Doing

centrate upstream of the PST distrubution

could significantly reduce H2S released in

the sludge process

Centrate dosing will be

implemented, initially on a trial

basis dependent upon a two

trial of two chemical.

Page 43

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