SECTION C -INFRASTRUCTURE OPERATION Attachment C1 ...

SECTION C -INFRASTRUCTURE & OPERATION

Attachment C1: Operational Information Requirements

- Outline Description of the Treatment Process at Kildalkey WWTP & Agglomeration

- Drawing No. 5270-2888

- Drawing No. 5270-2889

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EPA Export 26-07-2013:14:15:38

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OUTLINE DESCRIPTION OF THE TREATMENT PROCESS FOR KILDALKEY WASTE

WATER TREATMENT PLANT AND AGGLOMERATION

1.0 EXISTING PLANT

Kildalkey Waste Water Treatment Plant (WWTP) is located east of Kildalkey Village. The

plant was commissioned in 2000, treating municipal waste water from the village, with a

design capacity of 900 P.E. The drainage network serving Kildalkey discharges by gravity to

the sewage treatment plant.

The treatment process currently comprises extended aeration (activated sludge) secondary

treatment and clarification, followed by a tertiary (reed bed) polishing process.

Treated effluent from the works is discharged to the adjacent stream, which is a tributary of

the Tremblestown River, via two 150mm diameter gravity outfall pipes.

The existing treatment works currently consists of the following units:-

• Inlet pump sump chamber with bypass facility (for excess stormwater to bypass

treatment process)

• 'Agisac' preliminary screening

• Grit removal

• Preliminary balance tank

• Aeration (glass-lined steel) tank

• Secondary clarifier (glass-lined steel tank)

• Sludge holding (glass-lined steel) tank

• Reed bed tertiary treatment system

• Gravity outfall to the stream

• Offlce / Control building

Inlet to Works

Untreated waste water from Kildalkey Agglomeration enters the inlet lift pumping station via a

225mm diameter sewer. The pumping station consists of an underground holding

chamber/sump and is equipped with 2 Nr. submersible wet well pumps. Untreated

wastewater is then lifted to preliminary treatment, with continuous flow monitoring occurring at

Ihis stage of the works.

The inlet lift chamber is also equipped with an emergency storm water overfiow facility, such

that in extreme weather events stormwater can by-pass the treatment process and fiow

directly to the receiving waters, thus preventing inundation of the works. Excess stormwater

by-passing the works flows in a 225mm diameter pipe to the stormwater overfiow point

(SW3), terminating at the stream tributary of Tremblestown River.

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Inlet Works (Preliminary Treatment)

Preliminary treatment entails the removal of plastics, rags, grit, silt and sand from the waste

stream. Screening facilities are provided for solids removal of inorganic materials via an

'Agisac' fine screen. This screen is designed to produce washed screenings down to a

particle size of 3mm, with delivery to a nearby skip. Grit removal of the incoming screened

sewage is provided via a grit trap I classifier. The collected grit is also discharged to the

adjacent skip.

Screened sewage flows forward to an underground balance tank (capacity 32m' approx.).

The balance tank ensures that homogenous sewage is fed to the process plant. Following a

short retention time in the balance tank, partially treated waste water is then pumped (via two

submersible forward feed pumps) in a 100mm diameter rising main to the aeration unit.

Secondary Treatment

Extended aeration of the partially treated waste water is provided via a glass lined steel

aeration tank. Dissolved oxygen is supplied via a fine bubble diffusion system attached to the

base of the tank. Air is supplied to the diffusion system by means of a 7.5kW rated blower.

Dissolved oxygen is monitored continuously from a probe connected to the aeration tank,

which is linked to SCADA.

The activated sludge reactor has been constructed to the following approximate dimensions:

- diameter: gAm,

- overall depth: 4.0m

- freeboard: O.15m

- capacity: 267m'

Aerated waste water overflows a weir and is then diverted to the secondary clarifier. The

secondary clarifier comprises a glass-lined steel tank with the following approximate

dimensions:

- diameter: 5.1m,

- overall depth: 3.3m

- freeboard: O.8m

- capacity: 51 m'

The biomass generated in the aeration process tends to readily settle out during the

clarification stage. The secondary sludge collected in the clarifier is returned to the balancing

tank via the sludge return pump chamber (Return Activated Sludge line - RAS). A smaller

amount of this secondary sludge is 'wasted' and is pumped to the sludge holding tank via the

surplus sludge pump chamber (Waste Activated Sludge line - WAS).

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Currently a split-flow operation is in place at the plant, whereby treated effluent discharge, on

exiting the clarification stage, is split, with a proportion of this treated effluent discharging

directly to the receiving waters (refer to Secondary Discharge Point SW2) and the remainder

flowing forward to receive tertiary treatment in the on-site reed bed system.

Tertiary Treatment and Treated Effluent Outfall

As stated above, a portion of treated effluent also receives tertiary treatment. Effluent exiting

the secondary clarifier flows by gravity in a 150mm diameter pipe to the tertiary treatment

chambers, where it is distributed to the reed beds.

The effluent is distributed through the substrate layers of reed beds (6 nr. reed bed units on

site). The overflow from the reed beds is collected in an outflow chamber and then

discharged by gravity in 150mm diameter pipe to the adjacent stream (primary discharge

point SW1). Discharge of treated effluent is through a simple open-ended pipeline,

terminating directly over the stream, above the water level.

Sludge Handling

Settled sludge is drawn from the clarifier base via the surplus sludge pump chamber and sent

forward for temporary storage in the (glass-lined steel) sludge holding tank. As discussed

above, return activated sludge (RAS) is pumped back to the balancing tank via the sludge

return pump chamber. Waste sludge is pumped to the sludge holding tank at a rate, which is

determined by the MLSS concentration in the aeration unit. The sludge holding tank has a

capacity of approximately 34m3.

Sludge is allowed to settle in this tank and the resulting supernatant is siphoned back to the

balance tank. The sludge holding tank is emptied monthly (approximately) by tanker with the

thickened sludge being transported to the Navan Waste Water Treatment Plant for

dewatering.

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EPA Export 26-07-2013:14:15:38

SW3 STORMWATER OVERFLOW

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J:IProjecls\5270pp Meath Discharge Licence ApplicalionsID6-Drawings\02·TOBIN DrawingsIKHdalkey\5270·2888.dwg, 2888, 1710612009 17:14:22. ray kelly

SW2 SECONDARY DISCHARGE POINT (BY-PASSING REED BEDS)

SW1 PRIMARY DISCHARGE POINT ( PASSING THROUGH REED BEDS)

o Ordnance Survey Ireland. All rights reserved. Licence number 2008/10CeMA' Meath Local Authorities

Q

NOTES

WWTPSITE BOUNDARY

PRIMARY DISCHARGE

SECONDARY DISCHARGE

STORMWATER OVERFLOW

I . FIGURED DIMENSIONS ONLY TO BE TAKEN FROM nilS DRAWING

2. ALL DRAWINGS TO BE CHECKEO BY THE CONTRACTOR ON SITE

3. ENGINEER TO BE INFORMED BY THE CONTRACTOR OF ANY DISCREPANCIES BEFORE ANY WORK COMMENCES

4. ALL LEVELS SHOWN RELATE TO ORDNANCE SURVEY DATUM AT MALIN HEAD

CIi""t:

MEATH COUNTY COUNCIL

Pro)ed.: KILDALKEY WASTE WATER

DISCHARGE LICENCE APPLICATION

TiIlu:

EXISTING PLANT PROCESS SITE PLAN

SECTION I ATTACHMENT C.1

Sc;Jlu@ A3. 1: 500

Prepared by: Checked:

R.K. M.H.

e TOBIN P.~d J To",o & Co ~ kJ

TOBIN Consulting EnginooB. Murk!!1 SqU'"!!, Castlcbor. Co. Mayo. 1"""00. lei: +35J..(0){;4·0021401 fax :+35J..(O)fl.4·0021534 ... mail: Qlsllebar@tobjnie WWW.lobin.ie

OBI!!:

MAY09

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EPA Export 26-07-2013:14:15:38

INLET

CHAMBER! AGISAC GRIT RAW STORMWATER CHAMBER TRAPS WASTEWATER OVERFLOW (SCREENING) FROM KILDALKEY L ___ ~{~j

=':::":"~-1L...r

SCREENINGS AND GRIT

) FOR OFF-SITE DISPOSAL

Wz "'0: o=> =>1-...JW fflo: 01-wz 1-« ~~ ;::z uo: «W z"o:=> =>ffl 1-0 wz 0:«

)----1 BALANCING TANK

~

RASNIAS SUMP

CHAMBER

SUPERNATANT RETURN

WASTE A; TIVATED SLUDGE

SLUDGE WASTING

SLUDGE HOLDING

TANK

SLUDGE OFF-SITE

AERATION TANK

f---i>-----j CLARIFIER f----------C>--------+ ----1i>----

MIXED LIQUOR

OVERFLOW

STORMWATER OVERFLOW LINE

(BY-PASSING TERTIARY)

6 NO_ REED BEDS (TERTIARY TREATMENT) ,--- f--

f-- I--

I-- I---

f-- f--

f-- f--

~ f--

TREATMENT WORKS SITE

TREATED EFFLUENT TO SECONDARY

DISCHARGE POINT

~

TREATED EFFLUENT TO PRIMARY

DISCHARGE POINT

STORM WATER OVERFLOW

DISCHARGE TO THE STREAM

NOTES

1. FIGUREO DIMENSIONS ON\. Y TO BE TAKEN fROM THIS DRAWlNG

2 . ALL DRAWINGS TO BE CHECKED BY mE CONTRACTOR ON SITE

3. ENGINEER TO BE INFORMED BY THE CONTRACTOR OF ANY DISCREPANCIES BEFORE ANY WORK COMMENCES

.. . ALL lEVELS SHOWN RELATE TO ORDNANCE SURVEY DATUM AT M"LlN HEAD

,,,., I ~ ."

1"- ~.


Pru)ed: KILDALKEY WASTE WATER


,.." EXISTING PLANT I PROCESS

FLOW DIAGRAM

'--( SECTION I ATIACHMENT C.l LI

Chl!clu""

M,H.

M.F.G.

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J:\Projects\s270pp Meath Discharge Ucef'l(;e Applicalions\OS·Drawings\()2-TOBIN Orawings\Kilttalkoy\s270·2B89.dwg, 2889. 1710612009 17:14:50, ray kelly

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EPA Export 26-07-2013:14:15:38

SECTION C -INFRASTRUCTURE & OPERATION

Attachment C2: Outfall Construction & Design

- Outline Description of Outfall Design and Construction

- Drawing No. 5270-2892

- Drawing No. 5270-2893

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EPA Export 26-07-2013:14:15:38

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OUTLINE DESCRIPTION OF OUTFALL DESIGN AND CONSTRUCTION

1.0 PRIMARY DISCHARGE POINT

Location: SW1 - Kildalkey WWTP, Clonylogan TD., Kildalkey, County Meath

273002E, 258508N

Receiving Water: Discharge to tributary leading to Tremblestown River

Originates: Final treated effluent from Kildalkey WWTP (receiving secondary and

tertiary treatment)

Invert Level: 63.35 m.OD. (approx.)

Pipe Size: 150mm diameter gravity pipeline from WWTP

Design Criteria: Continuous flow of tertiary treated effluent from WWTP

Construction Detail: Simple open-ended outfall pipe discharging to stream channel

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EPA Export 26-07-2013:14:15:38

2.0 SECONDARY DISCHARGE POINTS

Location:

Receiving Water:

Originates:

Invert Level:

Pipe Size:

Design Criteria:

SW2 - Kildalkey WWTP, Clonylogan TD., Kildalkey, Counly Mealh

272986E, 258510N

Discharge to tributary leading to Tremblestown River

Final treated effluent from Kildalkey WWTP (receiving secondary

treatment)

63.5 m.OD. (approx.)

150mm diameter, gravity pipeline

Flow of secondary treated effluent from WWTP (by-passing tertiary

treatment)


There are currently no other secondary discharge points on the Kildalkey Sewerage Scheme.

In addition there are no emergency or occasional discharge points from any other structure on

the network.

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EPA Export 26-07-2013:14:15:38

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3.0 STORM WATER OVERFLOW DISCHARGE POINTS

Location:

Receiving Water:

Originates:

Invert Level:

Pipe Size:

Design Criteria:

SW3 - Kildalkey WWTP, Clonylogan T.D., Kildalkey, County Meath

272960E,258512N

Discharge to tributary leading to Tremblestown River

Storm water overflow from inlet pumping station sump at Kildalkey

WWTP

63.5 m.O.D. (approx.)

225mm diameter gravity pipeline

The inlet lift chamber is equipped with an emergency storm water

overflow facility, such that in extreme weather events stormwater can

by-pass the treatment process and fiow directly to the receiving

waters, thus preventing inundation and wash out of the works.

Excess stormwater by-passing the works fiows in a 225mm diameter

pipe to the stormwater overflow point (SW3), terminating at the

stream tributary of Tremblestown River.


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EPA Export 26-07-2013:14:15:38

/ SW2 SECONDARY DISCHARGE POINT

~~ E I L

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CLONYLOGAN

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MOYRATH

[]

NOTE S

WWTPSITE BOUNDARY

PRIMARY DISCHARGE

SECONDARY DISCHARGE

STORMWATER OVERFLOW

I . FIGURED DIMENSIONS ONLY TO BE T.-.KEN FRO~1lliIS ORAWING

2. ALL DRAWINGS TO BE CHECKED BY TliE CONTRACTOR ON SITE

J , ENGINEER TO BE INFORMED BY THE CONTRACTOR OF ANY DISCREPANCIES BEFORE ANY WORK COMMENCES

4. ALL lEVELS SHOWN RELATE TO ORDNANCE SURVEY DATUM AT MALIN HEAD

'nUI010 ""AII'=CII

e_ ".

C~"nt


Plt!lea KILDALKEY WASTE WATER


T~Ie:

PRIMARY DISCHARGE POINT, SECONDARY DISCHARGE POINT &

STORMWATER OVERFLOW LAYOUT I LOCATION PLAN

(SECTION I ATTACHMENT C.2 )

SGIIle @AJ. 1 : 5000

P f~redby: Che!: koo:

R.K. M.H.

projKt OlrflCtOr: M.F.G.

9 TOBIN r .. otI; J I cbi'l & o, t tl

TOBIN CGnsulll1l!l Eng;neers, Market Square, COsUellllr, Co. Mayo, Ireland. leI; .353-(O)04 · G02I~OI

IWI.:< J5J.(O)04 ·gQ215 304 IHnlllt [email protected] ~.tobinlo

Oat,,: MAY 09

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':::::=========:--:-=--:--:::-:--_____ ....:1...-_ ___ ...::::::::~ __ L_~ ___ .....J.±j+~~::____=_::_:_:_,_l,=-__:__:::==-__:_:_:_--,,----J _.,N, 5270-2892 A J:\Projacts\S270pp Meath Discharge Licence Applicalions\06-Drawings\02.TOBIN Orawings\Kildalkey\5270.2BSO,2BS1, 2884,2886,2892,2895.dwg, 2892, 17/0612009 17:09:56, ray keRy ICI Ordnance Survey Ireland. All rights reserved. Licence nymber 2008/10CCMN Meath Lccal Authorities

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EPA Export 26-07-2013:14:15:38

SW3 STORMWATER OVERFLOW

( 225mmQJ OUTFALL PIPE)

)

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SW3 - 225mmQJ STORMWATER OVERFLOW

J:\Projects\5270pp Meath Discharge Licence App~calions\06-Drawin9s\()2-TOBIN Orawings\KUdalkey\S270·28S2,2881,2893,2694.dwg, 2893. 1710612009 17:11:53, ray kelly

SW2 SECONDARY DISCHARGE POINT

( 150mmQJ OPEN-ENDED OUTFALL PIPE)

SWl PRIMARY DISCHARGE POINT

150mm~ OPEN-ENDED OUTFALL PIPE)

o Ordnance Survey Ireland. Atl rights reserved. Ucence number 2008I1OCCMN Meath Local AutIlorilies

• Q

NOT ES

WWTPSITE BOUNDARY

PRIMARY DISCHARGE

SECONDARY DISCHARGE

STORMWATER OVERFLOW

, . FIGURED DIMENSIONS ONLY TO Be TAKEN FROM THIS DRAWING

2. ALL DRAWINGS TO BE CHECKED BY THE CONTRACTOR ON SITe

3, ENGINEER TO BE INFORMED BY THE CONmACTOR OF ANY OISCREPANCIES BEFORE ANY WORK COMMENCES

4. All LEVELS SHOWN RELATE TO ORDNANCE SURVEY OAruM "TMALIN HEAD


Pm)od:

KILDALKEY WASTE WATER DISCHARGE LICENCE

APPLICATION

"'-PRIMARY DISCHARGE POINT (SW1)

DISCHARGE POINT & STORMWATER OVERFLOW (SW3)

CONSTRUCTION & DESIGN SECTION I ATTACHMENT C-2

1 : 1000

Prep:ulld by:

RK

S TOBIN P.~"tJ l otw> 3 C<l l H

TOBIN Con5u~lng Englnoenl, Merlllll SquaTI!, CosUebClr, Co. Mllya.lreland. lei: 'J5J..{OjQ.4.0021401 faJ :' J5J..(O)IIo4-0021534 .mllW, CIl51Jebllu@tobinoie ww-N.lobinlt!

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EPA Export 26-07-2013:14:15:38

SECTION C -INFRASTRUCTURE OPERATION Attachment C1 ...

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