.i i. .

Biological :

C l Wastewater Treatment with the STAHLERMATIC@-Aerotor

Proven Aeration System - Combination of Activated Sludge and Fixed Film nearly 30 years of experience, well-engineered, rugged construction

oxygen input at the spillway

intake of atmospheric air

wastewater filling the pipe

--. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

aeration from release of trapped air

_/- ____________________-----

Pipe-Aerotor (RR)

rotation

forced conduction and compression of the trapped air

running in wastewater

oxygen transfer at the transition zones air I water

_____________---____-------

-. -----._scraper blade alternative:

additional pipe --

Process Description

The wastewater treatment unit combines the advantages of the activated sludge process with those of fixed film in a unique design. The system works like a conventional activated sludge system with activated biological sludge in the mixed liquor and a return sludge circuit. This process is enhanced by working with higher concentrations of suspended sludge as a consequence of the low sludge volume index and by the additional effect of the fixed film.

The STM-AEROTOR is designed as a rotor equipped with pipes created by media discs. By rotating the rotor by a motor above water level, surface air is captured by the special design of the fixed film media and consequently the microorganisms in the basin are supplied with oxygen.

As soon as a pipe of the rotor emerges above water level during rotation, the mixed liquor inside the pipes flows out. By this it is firstly aerated at the spillway. The pipe will then be filled with atmospheric air. The necessary oxygen for the fixed film dissolves on the wet surfaces of the media discs. During the downward rotation the air is trapped in the pipes and forced into the mixed liquor. Moving downwards to the bottom of the biotank the air is compressed more and more. The compressed air is contacting all inner surface areas of the disc during rotation. The fixed film is supplied with oxygen during the entire rotation in the atmosphere and in the mixed liquor. During rotation parts of the air can escape. The bubbles travelling to the centre of the rotor result in a homogeneous mixing of the biotank. A circular stream in the centre of the rotor increases significantly the detention time of the lbubbles so that consequently the oxygen transfer time is much larger compared to a conventional diffuser aeration system. The activated sludge in the mixed liquor is always effectively supplied with oxygen.

The STM-AEROTOR is a highcapacity oxygen supply mechanism designed to satisfy high demands while using less power.

Zones with different oxygen concentrations are formed in the basin. These zones influence with advantage the processes of nitrification I denitrification and increased biological Pelimination. The system can be flexibly designed arid controlled adapted to varying requirements - by appropriately sizing the volume of the biotank - by changing the speed of the rotor (frequency controlled motor) - by adding additional media pipes and scraper blades

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Choosing larger dimensions of the biotimk equipped with the same aerotor (expanding the biotank volume) results in a larger treatment volume. Consequently the anoxic environmental zones are increased so that simultaneous denitrification takes place. These anoxic zones are mainly beneath and under the aerotor. At the tank bottom the concentration of the mixed liquor increases too as a result of first sedimentation in consequence of 1:he low sludge volume index created by the fixed film. Here all oxygen is consumted and a anaerobic zone is created so that an increased biological phosphorus elimination (luxury P-uptake) is additionally achieved. To that the sludge in the anaerobic zone becomes septic a scraper and I or additional pipes are to be installed so that the sludge is mixed and get back into the aerated turbulence of the aerotor.

circular stream aerobic zone

-/-- fluctuation zone: I aerobic I anoxic

\ anoxic I anaerobic zone

The basic construction of the rotor is a central shaft and a steel cage structure which transfers forces directly to the bearings. The central shaft is significantly less stressed.

Pipe-Aerotor

The pipes are formed by joining discs into cylinders. Several of these pipes are specially arranged to create the rotor. The pipes form hollow chambers which serve both to input oxygen and as fixed film growth surfaces. The discs consist of durable polypropylene. The distance between the discs is 20 mm. Each rotor can be fitted with additionall scrapers and pipes.

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‘1

. I . I

Wide ADDlicability

- treatment of domestic and industrial wastewater - partial or basic treatment, advanced treatment with nitrificationldenitrification,

- new plants, expansions, and retrofits of existing plants - single home treatment units - containerized and modular plants - large treatment plants in single and compactly designed concrete tanks - separate aerobic sludge stabilisation -treatment of septic and faecal sludges - treatment of liquid manure and other wastewaters from livestock

and increased biological Pelimination

Advantaaes

Process Stability The STM-system is very capable and reliable under even the highest demands. By optimally combining activated sludge with fixed film, required effluent concentrations are safely and steadily achieved, both for basic and for advanced treatment.

The Stahlermatic@-AEROTOR Using modular construction, it is possible to adapt the process to the requirements of every application or loading. The simple and ruggedly designed construction requires less maintenance. The selected materials guarantee long service life. Only half the power of a conventional diffusedair aeration system is required.

High Process Stability Highest process stability is achieved through a wide spectrum of microorganisms in the mixed liquor and the fixed film. Oxygen supply is always guaranteed even with increased effluent standards or during excessive loadings.

Smaller Footprint and Volume The high efficiency and the compact design reduce the needed footprint to nearly 50% of conventional process with the same efficiency.

Low Noise and Odour-Free Formation of aerosols and emission of odours are minimized due to the special design of the system. The low speed of the rotor requires no additional noise control measures.

Improved Sludge Quality Less production of waste sludge by the fixed film component, significantly lower sludge volume index, and best sludge settling and dewatering characteristics are the main attributes of the STM- AEROTORSystem.

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Recommended data5 for dimensioning The b.TV-Gui&lines are the basis for all dimensionings, documented in the papers A 122, A 126, A 131, A 135, A 257 and H 254. Other informations are given in the report of the ATV-workshoc 2.6.4 ”Combined waste water treatment techniques”. The follovdng recommended datas are based on practxal experience by operating more ‘lhan 500 STAHLERMATIC I: -facilities of 1ony standing worldvride (actual states of the STAHLERMATII? technique). These recommended datas have to be used in the dimensioning instructions according io the Guidelines mentioned ahwe.

Combined Waste water Treatment Tech n i gu es

The principle of the datas specified in the guide!ines mentioned above can be used for the dimensioning of the 5 lahlerma t ic-wastewa le r treatmen! fa c i I i ties.

Indicalioris For the method used of dmensioning of the STAH LERMATICS-system can be found in these guidelines; The influent load is divided in differeent proportions for the suspended activated sludge and for the fixed film. for both components the degndation efficiency has to vtle proofed separately in accordance with the guldelines, As a rule this method is bsed lor all wane water treatment plants wlith a design capaclty of not more than i O , O O O papulation equivalents. Other informations are given in the ATV- Guidelines A131 and H 254.

S utxiard BLrJradatiufs 9,Q . 4,O 4‘5 - 7,O

Deyrddation with nitriiicatiun and wig) denitrification 4,o. 7,o 5,Q * B,D

Sinhitwous acrobic stimilisdtion of s!udgc with addanced nitrifirdtinn i denitrification 5,o. 9,s ar#l ddvariid biological P-upukt.

Sbdee Volume indei (ml/#)

.. , .- ..... ., . .. .. . .. I . . ,

.._ - - l ___ ._ . . . . . ___ . .~ . . . . ,

-. . . .. _. --A..-, - ._,_ . -.. ... .-. - I .. . . . ~. . . . ... .. . .. - . . . . ~

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Flexibility of welume adaption and the dimensioning of the sxygen supply

The STM@system offers various possibilities in the design: Varietion of the oxygen supply by

Changing the number of rwrolutions o i the conlafl aerators (adaption to changing operation conditions) by using an infinitely variable gear motor or a frequency mgulald motor

Asembllng additional pipes; increase of the total oxygen transfer and of degradation Miciency

Adaption of the volume of the biotank

Volume of ttre biotank

I f the tank has t o be completely aerobic, e.g. far advanced nitrification, smaller sizes of the biotank are recomnnended. The biotdnk volume is then always sufficiently supplied with oxygen. A high nitrification efficiency is always guaranteed.

Choosing a larger size of the biotank equipped with the same contact aerator (expanding the biorank volume) results in a larger treatment volume. Cansequently the anoxic envlronmentsl zones ate Increased, so that simultaneous denitrification takes place. These anoxic zones are mainly beneath the contacl aerator$. By expanding the biotank volume an always aerobic omironmen1 in the antre and right nexl to ut0 contact aerator is guaranteed.

High nitrification efficiency is achieved independent of the number of revolutions of the contact aerator. The 5ize of ltre zones with different oxygen environment is not fixed. The extension of the zones wlll change dependent on the number of revoluttons, the oxygen demand and depending on the required degradation and the hydraulic loading rate (turbulence) of the tank.

Mainly the denitrification efficiency is influenced. The conditions for a high nitrification elficienw are always kepL Oxygen control in comblnation wlth operation control will keep nearly constant oxygen conditions In the different enulronmental zones. Advanced nitrification and simultaneous denitrification will always work with a high efficiency.

With the posslblllty to equip the contact aerators wlth additional plpes or l o choose other sizes of the biotank, the STf@-system can comply with all requirements of degredation: advanced biodegredation of the organic carbon components, advanced nitrification and $irnultdoeous denitrification.

Phosphate is exlenslwly eliminleted by blological uptake as lhe STM@system wlll work with higher concentrations of the blomass mpared to conventional 5ystems. In an expanded bibtank the suspended activated sludge changes continuburly from one oxygen environment into another {aerobic - anoxic). By this the P-uptake will be enhanced. Neverthetess the efficiency of lhe olher degradation processes Is kept wlthout changing.

10.0go populatiwi equivalents Advanced nltrlflEatiordden~fIratl~, with simultaneous biolo&al Puptake and sludge stablflsatlon

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W W P for a Cheese Production Plant in France 8

. I. - . . . .. . . .. . .

Small Packaoe Tkatment Plant for 100 p.e. ,(

Pig Waste Treatment with S T M -Aeroton

High process stability and flexibility, even under high loadings, by cornbinitig the activated sludge and fixed film processes. Even the strictest effluent standards can be met consistently

' I SOLID' AND SIMPLE ~ O N ~ R U ~ T I O P I

Quality System assured construction, including lony life polypropylene niedia, simple low-maintenance drive train, and nylon lined support bearings for extended life

9 -

os1 '

Tank volume i5 reduced by 40% over conventional aeration by the STM-Aerotor's process efficiency

The STM-Aemlor, which is 75% submerged, operates at slow speeds drivetr by a Iow-Dowered motor. This provides great savings in energy. Compawd with a fine birbble aeration only 45% of the necessary energy is

'

I used . 2

OVAL'

' The STM-Aerator can provide consistent simultaneous

' nitrification I denitrification, as well as biological phosphorous removal, In a single basin

Simple slow-speed operation reduces operating noise. The STM-Aerotor process operales with virtually no

, problem-causiny odours

Better sludge settling characteristics (lower sludge ' volume index), belter dewalerability, and smaller

volunies of waste sludge . .. . . _

STM%-Aerotors worldwide more than 800 references

CORK (Head Office): Unit 3. West Link Burliness Park, M a l l w Road, Cork Tel: 021 4307939 Fax: 021 4307941 e-mail: info@response-eng.com rrww.response-eng.com OUBLIN OFFlC E: TeVFax 01 2765004

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STM"-Aerot or

The Aeration System with Specific

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STAHLERMATIC* The combine wastewater treatment process The technique of the aLcombined processes” for the biological treatment of wastewater is a combination of the submerged fixed pmcess and the activated sludw system.

Wastewater treatment, according to the STAHlERMATld technique is effected on the one side by suspended activated sludge In lhhe mixed liquor and on the other side by flxed microcwganlsms In the biofilm on the surface of We contactors. This combines the advantages of activated sludge and flxed film processes in W. The system works like a conventional activated sludge !,ystern with activated biological sludge in the mixed liquor with sludge return. The efficiency of the typical actelved sludge system is cmhanced by wrking with hlgher concentratfons in the suspended sludge as usual and by the additional effect of the blofilm.

The STMWystem can be used in the same process combinatrons as conventional activated sludge systems, but with higher efficeincy, Advanced nitrification and denitrification as well !as effective biological P-elimination are carrled out simullaneo~ly and safely in one tank.

The immersed STW-Aerotor is a wheel with a centre shaft. The wheel i s of a cage design. The plates and discs in the contact aerators are formed with a special surface profile in order to assure maxlmum oxygen transfer. Only OM mechanical drive fs mccssaty. An electrlc gear motor above water level rotates the contact aerator. By this atmospheric air is dissolved in t h e mixed liquor to supply the activated sludge sufficiently with oxygen. The biofilm on the contact aerators i s adequately supplied with oxygen when the contractors emerge above water level. During the downward trawl the air is trapped in the chambers, crcated by the plates and tllsn of the contactors, and forced into the water. Moving dowmtfards to the bottom of the biotank the air is compressed more and more. The biofilm is supplied with oxygen during the rotation of tlhe wheel, in the atmosphere and in the mixed liquor. The trapped air is parlially used to reduce the power requirements by buoyancy U) that the power conrumptlon of the system is w*y low. Tht STMaAerotor complies with the requireme!nts of an efficient aerator with lowest power cansumptim.

Statting 1989 Degree of purification advanced nftrificefron

(control value < lOmg NIi4-N / 1, temperature > 12C

33 m g C O D / l

Volume load Efficient quality < 3 - B O D g / l

< 0.7 kg BOD5 Am‘ x d)

< 4 m N H 4 - N I l (4 w N O , - N / l

No chemlcal treatment < 1 mg P / 1

Mode of Operation In principle the mode of operation is identical for both kinds of contact aerators, the cell-segment - and the pipe-segment-contact- aerator.

The oxygen supply for all miwo~rganbms is ensuwd by rotating the SfMB-Aerotors slowly by an eleclric frequency controlled gear motor above water level. As soon as a segment emerges above water level during rotation, the mixed liquor lmlde the chambers flows out. The segment will then be filled with atmospheric air. The necxssary oxVgen for the biofilm dissolves on the wet surfaces of the fixed bed biofilm. Because this very large surface area is directly by the partial presulre of the air, an immediate saturation of the oxygen concentration is achieved.

When the segments are submerged again the air cannot escape and is trapped in the segments. In the course of the rotation the trapped air is f m d to the bottom of the biotank and compressed more and more. During the downward travel a part of the air can escape. The bubbles travelling with the rotation of the whw! result in a homogeneous mixing of the blotank. In addition the actirpled rlud#e In the mixed llquor Is always effeclwety supplied with axr9en.

During upward travel of the contact aerator the partially drfilled segments provide buoyancy and reduce dgnlficantly the power consumption. The fixed fllm on Ihe surface areas wlthln the segments are supplied with oxypn up to sfhatiom while passing the atmorphwe. The forced air is contacting all inner surface areas of the plates or discs in the segments during rotation. By this also all microoganlsms of the fired film are futly supplied with oxygen during rotation in the mixed liquor.

The forced air mcts the specially profiled surfaces of the plates and discs. Due to these profiles contlnubusly new, innumerable transition zones are formed for the oxmn transfer. This results in the typlcal oxygen supply for both cmponents, fixed blofllm and suspended activated sludge.

COD : 7000 W d conc. 3500 mgA Bob5 s 40 n?gl Effluent concentratlon

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Design Features The characteristic properties of UW STM-system aye the high degradation efficiency, high quality effluent standards and a high flexibility caused by the combination of the advantdges of the biological processes in U true hyrid system. In local settles plants the facilities can be equipped for permanent ure in any she. In cases of temporary u5e the facilltles are placed In container or modular constructed unlU Different sizes, and design features comply with ~ulrements specified. The used materials are provided to warantee a long senrice life. The solid and simple construction renders possible low maintenance, eminent safety in service and lowest power consumption, The STAHLERMATIC contact aerators can be constructed as a cell- segment or as a pfpe-segment contact aerator. The construction of the STM-contact aetators corres(lionds tb the principles of the DIN 19569 - 3 - 1995 - 01 (equipment of waste water facilities).

i . s i ' i I manufamflng waste Waq!?'~ ,

, I

Kind of waste water

Popuiatlon equiuajenu 5.000 starting 1994 Effluent quality 3 - 5 mgBODg/I

from a pagermill

65 - 70 me CODA 0,l NH,-N/I 1 mNtaa0

NochemlcaltroaMnt 1 n?gP/l

The cell-segment contact aerator (ZRI consists of several segments, each with two alrpockets. The segments are constructed of a series of plates, made of Polypropylene, to provide Oaqe g& surfaces for the fixed film biomass, and to create the airpockets for the oxygen supply. Sufficient oxygen transfer i s gMarafIlped for any pollution load. In principle the ptpe-segment contact aerator Is identical in function and operation with the cell-segment contacl aerator. The growth surfaces for the fixed film and the volume of the airpockets are smaller. This construction comply with the requirements for special applications or for other functions. Parallel to the shaft several cylindric hollow bodies in form of pipes are radially arranged as contact aerators. The plpn are constructed of a series of discs made of Polypropylene. Usually both kinds of contact aerators are equipped with a scraper. If required the contact aerators can be equipped with up to nine attached pipes. They increase the active surface area and the oxygen Input

Kind of wash water

Population equlvalents 12.000 Starting 1984 Volume load OI5-O,7k9 BOD5h'd)

+factwing waste waten fmm a papermill

Effluent auallty <5 mseoogi a70 mgCODA

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Application fields; The Si’M-technique is w d

for new was& water treatment facilities io equip existing plants to reach an advanced degree of treatment for reorganisatioo. modernisaticn and expansion of existing plants

The cantact aerator will be installed in a biotank built aE cancrete in great waste water treatment plants or in smaller local settled lacilitits. Smaller facilities or in cases of temporary bse of such facilities the STM-syrtern is built in a steel construction completely equipped: coritainewnits, packaged units, modular constructed units.

Application Fields Treatment of domestic waste water In every slze of the needed facility - single step or multiple steps waste water treiltment plants

Treatment of domestic waste water influenced by industrial and manufaclursi waste water Treatment ot organic loaded waste water from industry, manufacturing, trade, etc. STM-biological treatment facillties couple with - conventional activated sludge systems - denitrification facilities . N-elimination facilities - P-elimination facilities - sewage lagoons or polishing ponds - trealrnent facillties for fecal sludge

- primary sludge - excess sludge - fecal sludges

Biological treatment of leachate from sanitary landfill

Treatment of liquid manure partial, basic treatment

Aquaculture systems: JntenslCe fish fatmlng in closed warm water circuits

Aerobic sludge stabiliwtlon Operating since 1987 Klnd of waste water Population equivalents 26.000 Degree of tteaments

Holiday mort

biolagical degredatiorl with separate aerobic sludge stabilisatidn

I 10 rng# filterable solids Effluent quality < 5mg BODrJ

r \.-- - , 1 - . .~ . . ~ ~ ,r

The STAH LER MAT1 Cs-system Is equipped with 12 pipe-seqmen contact-aerators RR 4,3 x 2,5

The excess sludge will be stabilised sirnultifneously- The sludge is blOkIQidly and Sanitarrly clean and is pressed, dried, packed t,nto hags and used as fertiliser.

The table shorn flgures for the efflclency of the plant. Sanitary investigations of perms in the effluent water, in the slul$pe and in the air near the biological stage shws that hygenicably the plant works unobjectionable

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Feed Pipe dia Vel

Backwash Pipe Dia Vel

Backwash Pipe Gravity dia Fall Yo f Vel

Backwash Run Time min Sump Vol Reqd m3

Sump Dia Working Depth

I I I

m I 2.41 1.9 Re use Clarifier 1 1.56251 1.595568 m I ,

No of Nozzles 200 134 1 68 240

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................. .*:e ...... ...................... 1 . . I . i- ........ .................... c:+ ....

B t

Z J Z

t B c

........................ k* u.* ........ \

..... .... ::a ....... ........................ ........

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KSSseries KUHN spiral screen The constantly advancing development in modern sewage treatment plant,s requires maximum innovation. Much is expected especially from process and mechanical engineering solutions.

KSS-series KUHN spiral screens represent a new generation of fine screening that meets the highest technical standards in both production and on-site performance.

Trouble-free operation, long useful service life, minor maintenance requirements and simple integration in existing plants are only some of the factors that we can guarantee for this market.

Application The KSS-series KUHN spiral screens are mainly used in the primary treatment stage of municipal and industrial sewage treatment plants.

These screens are also used in the primary treatment of wastewaters [from slaughterhouses, tanneries, fish processing plants, etc.) and in concentration plants in the paper industry.

Operation and design KUHN spiral screens are mounted directly on the bottom of the container or trough. A bottom step is not necessary.

The liquid to be cleaned of !;olid matter is propelled through the separation scrE!en which holds back the solid matter.

The separation screen is cleared by the built-in shaftless screw conveyor and simultaneously cleaned by the cleaning brush.

The screw conveyor inside the cylindrical body transports the solid matter to the pressing and dewatering area. After the pressing and dewatering process, the screening is discarded through the discharge pipe. The press water is removed through the press water drain and the mounted drain pipe.

You have the option of attaching a bagging device on the discharge chute for hygienic purposes and to contain odors.

Design [technical features) The superior design of our KSS-series KUHN spiral screens ensures ecologically and economically optimal operation and guarantees long-term return on your investment, not least because of the following advantages:

high separation efficiency due to our special construction principle small power requirement high operational reliability because of a robust

low maintenance intensity structure and high-quality materials

KUHN GMBH . Franz-Kuhn-Str 1-3. 0-74746 Hbpfingen . Telephone: +49-[016283/2201-0 ' Fax, +49-1016283/2201-88~ w.kuhn-grnbh.de . tnfo@kuh-grnbh.de

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. . to separate solid matter from liquids 1_uy-

C

E+700

KSSseries spiral screen

0 E f 6min I flaw PnlkWl capacity

323.9 H + E i E1+950 200 410 < = IOV s I 1.1

A T A

+- U channel width 6

I KSS280 I C+775 I E/13.7071 + 1810 1 E+85O 1 355.6 1 H+E1 1 E1 + 1100 I 300 520 I <=25Vs I2.Oi2.211

KSS390 I C+860 /E/137071+2040~E+1050/ 3556 I H + E 1 /E1+11851 410 16001 <=60V~1361401

All dimensions m mm Specihcations may chmge without nnuce Speuficauons in 1 1 for nmm omo out ex pmectmml

KUHN GMBH Franz-Kuhn-Str 1-3. D. 74746 Hoplingen. Telephone. +49-1016283/2201-0. Fax. +49-l016283/2201-88~ w.kutu-grnbh.de . mfo@kuhn-gmbh de

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4

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- * -

MYSHALL WWTW ATTACHMENT C1

The existing WWTP had been built in 1976 for an estimated capacity of 250 pe. The WWTP by 2000 was receiving a load of 206 pe. The existing WWTP was performing poorly and was clearly not going to be able to cope with any new development that would take place in the Village of Mys ha1 1.

Carlow County Council saw Myshall as a suitable location to develop as a settlement town.

The Myshall Village Local Area Plan has zoned land to allow the population of Myshall to increase to 750 people.

The quality of the River Douglas was also a source of concern and the Myshall WWTP was a contributing factor to these problems.

The Douglas River had quality issues and a tighter discharge specification was required for the WWTP to allow the WWTP not to have an adverse effect on the receiving waters. There were various developments approved and thus the plant needed upgrading to cope with these new developments.

The existing aeration tank was square in design and contained a surface aerator. There system was operated by gravity and only a sludge return pump returned sludge fiom the final settling tank to the aeration basin. There was no forward feed pumping station and sludge drying beds were disused. There was no storm water holding capacity.

Carlow County Council progressed the new WWTP to tender stage during 2004. Funding was obtained under the Small Schemes. In the Small Schemes the Government funds 75% of the scheme with the remaining 25% fiom Development Levies.

The Myshall WWTP upgrade was tendered as a DBO bundle with two other WWTP projects. Ballon and Palatine WWTP upgrades were the other two plants in the DBO bundle. Ballon and Myshall were constructed simultaneously and Palatine commenced construction January 2009.

Tenders were received during August 2004 and the Tender was awarded to Response Engineering Ltd.

The original contract was signed on the 24'h of May 2005.

However a fourth WWTP was added to the Bundle and the Fenagh Upgrading element of the DBO bundle was amended and signed on the 15th of June 2007. Works commenced on the Myshall WWTP site in January 2006 with the new WWTP receiving effluent in April 2007.

The new works consists of the following:

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Inlet 6mm screening and de-grittirig on all flows, including storm flows. Storm water holding of 3DWF fcr 2 hours, providing settlement and a baffled outlet for overflow to the Douglas River, with held storm water returned for treatment. Flow measurement of flow to full treatment and storm overflow. Secondary treatment using aeration and settlement. Tertiary treatment using a sand filtration system. Phosphorous reduction using ferric dosing.

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Sludge holding and thickening tank with flow measurement for sludge removed fiom site.

Final settling tank with half bridge scraper and scum pump. Waste activated sludge (WAS) and return activated sludge pumps (RAS). Green metal cladded control building with form 4 panel and toilet, store room.

The treatment standards for the new works are :

BOD lOmg/l 95%ile TSS 1 Omg/l 95%ile AmmN 5mg/l 95%ile Total P 1mgA 95%ile

The Myshall WWTP is designed to receive a DWF of 184m3 per day. The WWTP can cater for a peak flow of 45Vs.

Flows up to 3 DWF ,552m3 a day.

The sewerage enters the site via gravity and passes through a 6mm screen with an automatic wash water system using final treated effluent. Sewerage then flows into a grit classifier where it is degritted for 95% removal greater than 0.2mm with a specific gravity of greater than 2.6. There screenings are collected in wheelie bins that are situated in enclosed structures. There is a contractor appointed to collect these bins on a regular basis.

The sewerage then flows via gravity to a forward feed pump station and then pumped into the aeration basin.

The Aeration Process consists of the Slahlermatic (STM) Process. This is an advanced process incorporating a combination of fixed film and activated sludge growth mechanisms in a single unit.

The process consists of a rotating wheel within a concrete structure. Atmospheric air is dissolved into the mixed liquor by the rotating wheel to supply the activated sludge with oxygen. The biofilm on the contact aerators is adequately supplied with oxygen when the contactors emerge above water level.

An aeration wheel supplies oxygen to the mixed liquor and the wheel is automatically controlled by a dissolved oxygen probe to provide ideal aeration conditions.

The Dissolved Oxygen level is controlled by regulating the speed of the Stahlermatic Wheel.

The Mixed Liquor Suspended Solids (h4LSS) liquid flows via gravity to a circular final settling tank with a half bridge scraper. There is a scraper on the floor of the final settling tank to scrape fi-esh healthy sludge to the centre of the tank. This healthy sludge is returned back to the aeration basin on a continuous basis. The top scraper scrapes the scum to a scum sump where an automatically activated scum pump pumps the scum back in to the system for full treatment.

Any storm flows that are not processed fix full treatment are transferred automatically to two oval shaped storm water holding tanks that automatically return the flows to the forward feed pumping station once the plant is able to process the volumes received. The overflow from the storm tank to the river Douglas is metered.

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The-kial clarified water then flows via gravity to a filter feed sump where it is then pumped through a mechanical sand filter into a final effluent sump. The final effluent flows via gravity to a manhole and then to the River Douglas. There is a backwash pump in the final effluent sump that cleans the filter sand on an automatically controlled cycle.

There is a ferric dosing system with a duty and standby pump which dose ferric sulphate into the aeration basin .These pumps are controlled by the forward feed pumps.

A cone test is done every morning and this will determine if sludge is to be wasted. The sludge is wasted into two oval sludge holding tanks and when full taken away by tanker. The sludge holding tanks are linked together and the:y have a combined and automatic decanting system.

All the electrical equipment is controlled. by a PLC which sends signals to the various equipment for automatic operation. The caretaker visits the site daily and vital information is recorded into a data log book. The caretaker has a mobile phone that is linked to an emergency dial out system to warn him of any critical failures.

There is an automatic sampler on the inlet and outlet of the plant for testing purposes.

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