CONTROL PHILOSOPHY - Environmental Protection … PhilosoDhv 312 3 1. OVER VIEW A waste water treatment plant is being up graded at Palantine to treat waste water from the local housing

Palantine M P

Design - Build - Operate

MECHANICAL & ELECTRICAL WORKS

CONTROL PHILOSOPHY

(DRAFT)

TO BE READ IN CONJUNCTION WITH P+ID PLAN (DRAFT & REV, 0)

CARLOW COUNTY COUNCIL

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Control Philosophy 1/23

TABLE OF CONTENTS

PRELlMlNAR

I. Overview

II. Abbreviations

Ill. Tags and codes in P+ID plans

IV. Alarms

Waste Water Treatment Plant I. Inlet Screening

2. Forward Feed Pumping Station

3. Grit Classifier

4. Aeration Tank

5. Clarifier

6. Final Effluent Pumping Station

7. Sludge Holding Tanks

8.

9. Ferric Dosing

Storm Tank & Tertiary Treatment Filter

July 2007 DRAFT Palantine WWTP

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Control Philosophv 2/23

REVISION TABLE

The process control description is based on the following “P+ID drawing: I Drawing No. I Title I description I Revision I Date 1 I I I

106337-501 I P8iD - Palantine ‘Waste Water Treatment Plant I 1 I 0712007

Palanline WWTP July 2007 DRAFT

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.

Control PhilosoDhv 312 3

1. OVER VIEW

A waste water treatment plant is being up graded at Palantine to treat waste water from

the local housing estate. The plant is designed for an inflow of 230 m3 of waste water per

day.

a. Waste Water Treatment Plant

Waste water enters the treatment plant through an existing inlet manhole from the local

sewer network. Solid non-biodegradable objects are removed from the incoming flow at

the inlet screening and are removed to a waste skip. The waste water gravitates to the

forward feed pumping station and is pumped to the grit classifier where grit particles are

removed. Flows in excess of 3 x DWF are pumped to the storm water holding tank. The

water flows back from the storm tank to the pumping station via an actuated butterfly

valve when the inlet flow has receded. Water flows by gravity from the classifier to the

aeration tank. Oxygen is introduced to the tank by a fixed film aerator on a VSD drive.

The drive is controlled by a dissolved oxygen probe. The water flows from the aeration tank to the clarifier. A rotating half bridge cause the sludge to settle to the bottom of the

tank where it is pumped to the sludge holding tanks as WAS or returned as RAS to the

aeration tank. Clarified water overflows a weir in the clarifier and flows by gravity to the

final effluent pumping station. The clarified effluent is pumped to the tertiary filter for final

treatment and gravitates to the out fall.

Wash water is pumped to the inlet mechanical screen during cleaning from the final

effluent pumping station.

b. Waste Sludse

WAS is stored in two sludge holding tanks. The tanks are aerated by means of an air

compressor and diffuser arrangement to prevent septic conditions occurring.

Supernatant is decanted off and flows to the inlet pumping station. Settled sludge is

periodically removed from the tanks by a road tanker.

Palantine W T P July 2007 DRAFT

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Control Philosophy 412 3

II. Abbreviations List

AB = Air Blower

B = Bin / Skip

BV = Butterfly Valve.

CO = Compressor

D/S = Duty / Standby

DO = Dissolved Oxygen

DWF= Dry Weather Flow

FM = Flow Meter

GV = Gate Valve

LS = Limit Switch

M = Motor

P = Pump

PLC = Programmable Logic Controller

PS = Pressure Switch

RAS = Return Activated Sludge

SA = Sampler

SC = Screen

SHT = Sludge Holding Tank

SV = Solenoid Valve

. .

US = Ultrasonic Level Sensor

VSD = Variable Speed Drive

WAS = Waste Activated Sludge

Palantine WWTP July 2007 DRAFT

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Control PhilosoDhv 512 3

- 01 - sv 05 E Unit No. (e.g. inlet works, Instrument I equipment Instrument I equipment R pumping station) (see note 1) number. --

111. Tags and codes in P+ID plans

Existing

Replaced

New

Letter First letter

B -

C -- F Flow

Succeeding letter(s)

Display of state (e.g. motor

running)

Controlling I

T

X

Z Addition

-- Time or time programme

Level

Moisture or humidity

Pressure (analysis, concentration, conductivity, etc.)

Quality - Temperature

OnlOff I

-

Indicating -- - -- Recording - - Switching

Transmitting -

Emergency of safety acting

In case of 2 or more succeeding letters, they will be placed one after the other in the

sequence I-R-C-T-Q-S-2-A-B.

Note 1:

For explanation of tags I symbols, please refer to “Process and Instrumentation Diagram

Details” plan.


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11 I


iv. Alarms

Prioritv I

e Event

Locally displayed at control painel.

Prioritv 2

e Attention (High level detected)

e Caution

Alarm raised locally and at the county councils head office.

Prioritv 3

e Urgent (Over flow, pump fail to start, etc)

Alarm raised locally and at the county councils head office.

Where duty / standby pumps are installed. If the duty pump fails to start, the standby

pump automatically becomes the duty pump. A priority 2 alarm is raised.


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r

Conlrol PhilosoDhv 7/23

I . INLET SCREENING

1.1 Process Description

A new manhole installed at the treatment plant receives flows from the existing inlet

manhole through a 0225mm pipe and from the control building through a 0150mm pipe.

Waste water gravitates to the inlet screening chamber through a 0 225mm pipe.

The water flows through a mechanical screen where solid non-biodegradable material is

removed to a waste skip by a mechanical screen (01-SCOI). In the event of power

failure the incoming flow is diverted to the outfall chamber by a 0300mm pipe.

The screen is controlled by an ultrasonic level sensor (01-USOI) located prior to (01-

SCO1) and a timer. When a high level is detected by ultrasonic level sensor (01-USO1) in

the inflow chamber, the mechanical screen starts and removes solid material to the

waste bin (01-901). When the screen is started, wash water is pumped from the final

effluent tank to the screen by return pumps (06-Pol-02) to remove build up of waste

material on the mechanical spiral. The screened effluent flows by gravity from the inlet

works to the forward feed pumping station via a 0 225mm pipe.

1.2 Control Philosophy

(Levels and times to be set during commissioning)

1.3 Automatic Operation

Screen (01-SCOl)

Duration of screen cycle to be controlled by a timer

0 In the event of a high level as monitored by level sensor (01-USOI), screen starts.

0 Material is removed from the screen by a spiral conveyor to the waste bin (01- 601).

Screenings are compacted in the compaction zone of the conveyor to remove water.

Diained water is diverted down stream of (01-SCOI).

Solenoid valve (01-SVO1) opens to allow wash water to the lower area of the screen.

The valve is controlled on a time basis (2 seconds open I 5 seconds pause) while (01-

SCOI) is running.


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Control Philosophy 8/23

Tag

01-SCOI

01-SVOllO2

01-BO1

Solenoid valve (01-SVO2) opens to allow wash water to the upper area of the

conveyor to the compaction zone. The valve is controlled on a time basis (5 seconds

open after every 120 seconds of (01-SCO1) running.

Solenoid valves (01-SVOI-02) close and the screen (01-SCOI) stop after a period of

time after a low level is detected by (01-USO1).

- Description

Mechanical Screen

-

-

Solenoid Valves

Waste Bin - -

The screen is also started automatically by the PLC if a cycle has not occurred with

in a preset time.

Tag

01-us01

0 1 -SA0 1

0 In the event of a high - high level as monitored by (01-USOI) an alarm is raised at the

local control panel and at the county councils head office.

Description Signal Alarm Comment

L.1 R.C Ultrasonic Level Analogue Priority 2 at high level

Controls 01-SCO1

Sampler Q.1.R

“Y type” strainers (01-YSOI-02) are installed in the wash water pipe line prior to the

screening unit to prevent dirt particles affecting the washer unit.

A flow proportional refrigerated sampler ( O l S A O I ) located in the inlet chamber

automatically collects samples of the incoming waste water for analysis.

1 DRIVES - PLANT

Control

01-us01 I n\ml

Controls at PL-01

I I 1

Palanline WWTP July 2007 DRAFT

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Control Philosophy 912 3

2. FORWARD FEED PUMPING STATION


The forward feed pumping station receives flows from:

The inlet screening.

0 Supernatant from the sludge holding tanks.

Water from the grit classifier.

0 Return flows from the storm water holding tank.

Waste water is pumped to the grit classifier by 2 No. forward feed pumps (02-POI-02).

The pumps operate on a dutyktandby basis. The pumps are controlled by VSD’s, level

sensor (02-USO1) and flow meter (03-FM01). The pumps ramp up or down depending

on the level in the pumping station. The pumps are VSD controlled to maintain an even

level in the pumping station. The pumps automatically change over from duty to standby

on a time basis. Switch over time to be set during commissioning. On start up the pumps will run at 50Hz I max permissible flow until the level in the sump falls to the control level.

The pump speed is then controlled by the VSD to maintain a level until a minimum set

speed is recorded at which point the sump level is allowed to fall until it reaches the cut

out level.

During high flows > (3 x D.W.F) excess water is pumped to the storm water holding tank

by a storm pump (02-PO3). The pump is controlled by level sensor (02-USO1). The water

returns to the forward feed pumping station when incoming flows have receded to a flow

below (3 x D.W.F). An actuated buttemy valve (02-BVOI) automatically controls the

return flow from the storm tank based on levels in the forward feed pumping station.


(Levels to be set during commissioning)


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Control Philosophy 10123

2.2.1 Automatic Operation

Forward Feed Pumps (02-PO1-02).

In the event of a cut in level as monitored by level sensor (02-USOI), duty pump

starts.

0 In the event of a cut out level as monitored by level sensor (02-USOl), duty pump

stops.

If the level in the pumping station increases as monitored by (02-USO1) the duty pump

ramps up.

ramps down.

If the level'in the pumping station decrease as monitored by (02-USOl), duty pump

0 In the event of a high - high level as monitored by (02-USOI) an alarm is raised at the

local control panel and at the county councils head office.

Storm PumD (02-P03)

In the event of a high level as monitored by (02-USOl), pump starts.

In the event of a low level as monitored by (02-USOl), pump stops.

Actuated Butterflv Valve (02-Btvo1)

In the event of a high level as monitored by (02-USOl), and a signal from (08-USOl)

valve automatically closes.

0 In the event of a low level as monitored by (02-USO1) and a signal from (08-USOl),

valve automatically opens.


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Descrlptlon Control Control parameter Comment Tag

02-POI42 Forward Feed Pumps 02-us01 Level Duty I Standby I VSD

03-FMO1 Flow Controls at PL-01

Duty

Controls at PL-01 Strom Pump 02-us01 Level 02-PO3

Actuated Butterfly Duty 02-us01 Level

Controls at PL-01 02-BVO1

Valve L

Description Slgnal Alarm Tag -

02- U so 1 Ultrasonic Level Analogue High Level

Comment

L.1.R.C

Controls 02-POI-03, 02-

BVOl


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Control PhilosoPhv 12/23

Time

0o:oo

3. GRIT CLASSIFIER

Control 03-3BVO1 is in air position


00:05

The grit trap receives flow frorn the forward feed pumping station via a 0lOOmm pipe. A

flow meter (03-FM01) located on the vertical measures the forward flow. Grit settles to the bottom of the grit chamber.

At timed intervals the grit is removed to a classifier (03-SCOI) by means of an air blower

(03-AB01). Air is introduced to the bottom of the chamber to re-suspend the grit in

solution. A three way solenoid valve (03-3BVO1) controls the direction of air. Once the

grit has been agitated, the air is directed to the-discharge pipe. The grit is lifted to the

classifier. The grit is dischargied to a waste bin (03-801) for disposal. Water from the

classifier gravitates to the forward feed pumping station by a 0150mm pipe.

Water in the grit chamber gravitates to the aeration tank via a 0200mm pipe.

03-AB01 Starts, Air is diverted to bottom of

chamber to agitate settled grit.


(Levels & times to be set during commissioning)

3 5


0O:lO I 03-3BVOl changes to air lift position. Air is

4

5

6

7

8

20 00:30 03-AB01 is off

1 14 00:45 03-AB01 isoff

1 00:46 Go to step 5

14 01:oo 0 Got tostep 6

00:31 0 03-AB01 is on, 03-3BVO1 is in air lift position.

9 0o:oo

I I I I diverted to the discharged pipe. I

Cycle starts again


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Control Philosophv 1 3/23

Tag Description Control Control parameter

03-SCO1 Gnt Classifier Timer Time

03-AB01 kr Blower Timer mme

03-3BV01 Solenoid Valve Timer Time

Comment

8 Duty

Controls at PL-01

Duty

Controls at PL-01

Duty

Controls at PL-01

Tag Description Signal Alarm

03-FM01 Flow Meter Analogue


Comment

F.1.R.C

Controls 02-POI-02, 09-POI-02, 05-PO2-03

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Control PhilosoDhv 14/23

4. AERATION TANK


The aeration tank receives flows from:

0 The grit classifier through a 0200mm pipe.

The clarifier sludge pumps (05-P02/03) through a 0100mm pipe.

The aeration tank consists of ,a fixed film aeration wheel. The aeration wheel is driven by

a motor drive (04-Mol). The motor is controlled by a timer and a dissolved oxygen probe

(04-0001) located in the aeration tank. On start up (04-Mol) runs at full speed for 10

minutes. If (04-0001) records a high oxygen level, an alarm will be activated and (04- Mol) will stop. The aerator will resume 5 minutes after a level below the maximum is

reached or every 60 minutes for a period of 10 minutes at full speed if an air level below

the set point is not reached.

Ferric sulphate is dosed in to the incoming flow by dosing pumps (09-Pol-02). Aerated

effluent overflows a weir in the aeration tank and gravitates to the clarifier through a

0200mm pipe.


(Levels to be set during commiissioning)


Aeration Motor (04-Mol)

0 In the event of low dissolved oxygen levels as monitored by (04-D001), motor ramps

UP.

0 In the event of high dissolved oxygen levels as monitored by (04-DOOI), motor ramps

down.

0 At a high - high dissolved oxygen level the motor stops.

0 The motor is also controlled by a timer.


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Tag Description Control Control parameter

04-MOI Aerator Motor 04-0001 Dissolved Oxygen

Timer Time


Comment - Duty I VSD

Controls at PL-01

DRIVES - PLANT 1

' INSTRUMENTATION

Tag Description Signal Alarm Comment

04-DO01 Oxygen Analogue Priority 2 at low levels Dissolved Q.1 R.C

Probe Controls 04-MO1

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5. CLARIFIER


The clarifier consists of:

A rotating half bridge with drive motor (05-Mol).

Scum Pump (05-POI).

Two RASMlAS pumps (05-PO2-03).

Limit switch (05LSO1).

Aerated liquid flows by gravity from the aeration tank to the clarifier and is directed to the

central diffusion drum. The flow discharges radially at the bottom of the diffusion drum.

The rotating half bridge is fitted with scrapers to direct sludge that settles on the floor of

the tank to a central hopper. The sludge is pumped from here by two RAS / WAS pumps

(05PO2-03) to the sludge holding tanks as WAS or to the aeration tank as RAS. The

pumps operate on a duty / standby basis. The pumps are VSD controlled and ramp up

and down depending on incoming flow as monitored by flow meter (03-FM01). The

pumps automatically change over from duty to standby on a time basis. Switch over time

to be set at 24 hrs initially.

The rotating half bridge is controlled by a fixed speed drive motor (05-Mol).

Clarified effluent over flows a weir plate around the tank and gravitates to the final

effluent pumping station through a 0200mm pipe.

Scum on the surface of the water is directed to a scum box by a scraper on the top of the

half bridge. The scum is pumped by scum pump (05-Pol) to the sludge holding tanks.

The pump operates on a duty' basis. The pump is controlled by a limit switch (05-LSO1)

located on the top of the tank. The limit switch is activated by a striker on the rotating half

bridge every complete revolution of the half bridge.


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Control PhiiosoDhv 17/23

Tag Description Control Control parameter Comment

05-MO1 Clarifier Drive On/Off Manual Duty

Controls at PL-01

Duty

Controls at PL-01 05-PO1 Scum Pump 05-LSOI Position

- Flow I Timer I Duty/ Standby

Operator Controls at PL-01

05-FM01 05-P02-03 RAS I WAS Pumps Time

Manual

DRIVES - PLANT 1

Tag Description Slgnal Alarm

05-LSOI Limit Switch Digital

Comment

P.1.R.C Controls 05M01


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Control Philosophv . la123

6. FINAL EFFLUENT PUMPING STATION


Clarified effluent enters the final effluent pumping station from the clarifier through a

0200mm pipe.

The pumping station consists of:

Two wash water return pumps (06-POI-02).

Two tertiary treatment filter pumps (06-PO3-04).

Ultrasonic level sensor (06-IJSOI).

Clarified effluent is pumped to the tertiary treatment tank by 2 No. forward pumps (06-

P03-04). The pumps operate on a duty I standby basis and are controlled by level

sensor (OSUSOl) . The pumps; automatically change over from duty to standby on a time

basis. Switch over time to be set during commissioning.

Clarified effluent is pumped to the inlet screen (01-SCO1) during operation of the screen

by 2 No. wash water pumps (06-POI-02). The pumps operate on a duty I standby basis.

The pumps are controlled by ai timer and a level sensor (06-USO1).

The pumps automatically change over from duty to standby on a time basis. Switch over

time to be set during commissioning.


(Levels to be set during commissioning)


Tertiarv treatment filter Pumps (06-PO1-02L

In the event of a high level as monitored by (06-USOl), duty pump starts.

0 In the event of a low level as monitored by (OS-USOl), duty pump stops.


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Description Control Control parameter Tag 01-SCOI Inlet Screen

06-POI-02 Wash Water Pumps 06-us01 Level

06-P03-04 06-us01 Level Tertiary Filter Feed

Pumps

Wash Water Pumps (06-P03-04)

Comment

Duty I Standby

Controls at PL-01

Duty / Standby

Controls at PL-01

Duty pump is started by an ON signal from the (PLC), screen (01-SCO1) on.

Duty pump is stopped by an OFF signal from the (PLC), screen (01-SCO1) off.

In the event of a low level as monitored by (06-USOl), duty pump stops.

J Comment

L.1.R.C


06-US01 Ultrasonic Level Analogue - Controls 06-Pol-04

1 INSTRUMENTATION


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Control Philosophv 20123

Control Control parameter

Timer Time

7. SLUDGE THICKENING T A M

Comment

Duty


The sludge holding tanks receive WAS flows from the sludge pumps and scum from the

clarifier.

In the sludge tanks, heavycsluldge settles to the bottom of the tank and supernatant flows

on the top surface. The sludge tanks are aerated by means of an air compressor (07-

COOI). The aeration cycle is controlled by a timer.

When the compressor (07-CC)OI) starts, air is introduced to the bottom of the tanks by

means of a diffuser pipe located along the bottom of each tank. Air is directed to the

tanks one at a time by means of electronically actuated solenoid valves (07-SV01/02).

When valve (07-SVOI) is open and valve (07-SVO2) is closed, air is directed to sludge

holding tank 1. After a preset time valve (07-SVOI) closes and valve (07-SVO2) opens

Manual

Timer

and sludge holding tank 2 is aerated. The aeration cycle can also be started manually

prior to sludge removal.

Supernatant can be drawn off at a lower level by a manual decanting valve. A bauer

connection allows for settled sludge at the bottom of the tanks to be removed by a road

tanker. A flow meter (07-FMCII) measures the amount of sludge removed by the road

Operator Controls at PL-01

Time Duty

Controls at PL-01

tanker.


07-FM01 Flow Meter Analogue

I DRIVES - PLANT 1

Comment

F 1.R

-

-

r- 07-SVO1102 Solenoid Valves


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Control Philosophv 21123

8. STORM TANK &TERTIARY TREATMENT FILTER


Storm Tank

The storm tank is used as storage in the event of high flows entering the treatment plant.

Waste water is pumped from the forward feed pumping station to the storm tank by storm pump (02-PO3).

Liquid level in the tank is monitored by an ultrasonic level sensor (08-USO1) located on

top of the tank.

If the incoming flow to the storm tank is in excess of the storage capacity, storm water is

discharged to the receiving waters. The quantity of discharge is calculated using the PLC

and the ultrasonic level sensor (08-USO1).

Storm water gravitates back to the forward feed pumping station when storm levels have

receded (as per chapter 2).

Tertiarv Treatment Filter

Clarified effluent is pumped from the final effluent pumping station to the tertiary

treatment filter by 2 No. tertiary feed pumps (06-Pol-02). The tertiary treatment filter

consists of a wedge wire screen arrangement.

As the clarified effluent passes down through the filter, suspended solids in the effluent

will be retained in the filter. Following the filter the effluent gravitates to the outfall of the

works through a 0150mm pipe.

8.2 Control Philosophy (Levels to be set during commissioning)


None


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Description Control Control parameter

DRIVES - PLANT

Comment


08-US01 Level Analogue

Comment

L.1.R


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Control PhilosoPhv 23/23

Description Control Control parameter Tag 09-POI42 Dosing Pump 03-FM01 Flow

9. FERRIC DOSING


Comment

Duty I Standby

Ferric sulphate is dosed in to the aeration tank at a rate to be set during commissioning.

The ferric sulphate is dosed by 2 No. dosing pumps (09-P01-02).The pumps operate on

a duty I standby basis. The pumps are controlled by flow meter (03-FM01). The ferric

sulphate is stored in an IBC (lm3) tank located over a bund. Level to be monitored by the operator.



(Dosing rate to be set during commissioning)

Comment


IDosinq Pumps (09-Pol-02)

0 In the event of incoming flow as monitored by (03-FM01), duty pump starts.

0 In the event of no incoming flow as monitored by (OSFMOl), duty pump stops.

Palantine WWTP July 2007 . DRAFT

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c1 - PALATINE M W

The existing WWTP had been built in 1985 for an estimated capacity of 300pe. The WWTP by December 2004 was receiving a load of 280pe. 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 Palatine.

The village is strategically located close to Carlow Town and adjacent to the old N9 and the proposed motorway M9.

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

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

The Palatine Stream is not particularly large 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 circular is design and in the centre of this tank was the settling tank. There was a forward feed pumping station and sludge drying beds. The plant was aerated by a surface aerator. There was no storm water holding capacity. The two forward feed pumps were controlled by an electrical panel and the aerator and sludge pump were controlled by another.

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 fimds 75% ofthe scheme with the remaining 25% from Development Levies.

The Palatine WWTP upgrade was tendered as a DBO bundle with two other WWTP projects. Ballon and Myshall WWTP upgrades were the other two plants in the DBO bundle were completed first before the works on Palatine commenced.

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

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

However a fourth WWTP was added to the Bundle and the Palatine Upgrading element of the DBO bundle was amended and signed on the 15"' of June 2007. Works commenced on site in January :!008 with the new WWTP receiving effluent in September 2008.

The new works consists of the htlowing:

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‘t

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Inlet 6mm screening and de-gritting on all flows, including storm flows. Storm water holding of 3DWF for 2 hours, providing settlement and a baffled outlet for overflow to the Palatine Stream, 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. Sludge holding and thickening tank with flow measurement for sludge removed from site.

The treatment standards for the new works are

BOD 10mg/l 95%ile TSS IOmg/l 95%ile AmmN 5mgll 95%ile Total P lmg/l 95%ile

The Palatine WWTP is designed to receive a DWF of 230m3 per day. The WWTP can cater for a peak flow of 45Vs.

Flows up to 3 DWF , 690m3 a day.

The flows enter the WWTP via a 225mm diameter sewer at the south eastern end of the site. It first passes through the Inlet Screen where the effluent receives screening to 6mm.

It then enters a forward feed pump sump. There is a duty and standby pump in the forward feed chamber.

It then is pumped to the Grit Classifier where it is degritted for 95% removal greater than 0.2mm with a specific gravity of greater than 2.6.

From the Grit Classifier the effluent passes on to the Aeration Basin. The Aeration Process consists of the Stahlermatic (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.

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From the Aeration Basin the effluent flows into the clarifier. The clarifier consists of a rotating bridge with scrapers along the floor. The hopper at the centre collects sludge. Sludge is then returned to the aeration tank or drawn off to the sludge holding tank.

Effluent flows from the clarifier into the tertiary treatment unit. This is a sand filtration system where the effluent is forced through suitably graded sands and gravel. The sand is backwashed every hour. The existing tank is used as a sump for the clear water required to carry out the backwashing operation.

The outer section of the original treatment tank is used as a storm holding tank.

The WWTP will hl ly treat up to three times dry weather flow of 230m3 per day. Flows in excess of this will pass through the inlet screen and overflow fi-om the forward feed pump sump to the storm pump :jump from where it is pumped into the storm holding tank which will provide storage for a1 hrther 3 times the Dry Weather Flow.

Flows in excess of this will overflow directly to the Palatine but will have received screening and a degree of settlement in the storm holding tank.

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EPA Licence application

Palatine WWTW

River BOD mg/l Amm N mg/l

Palatine stream

1.0 Effluent Dilution.

Phosphorous mg/l ORP mg/l

2 1

The Palatine WWTW discharges into the Palatine Stream which flows north-west to the river Lerr and joins

it about 2 miles away. The Palatinr: stream had a 4 3 rating in 2003, since then Carlow County Council

have replaced the old WWTW with a new works.

There is no staff gauge or flow station on the Palatine Stream and the estimated flows for the Palatine

stream are based on a small catchment stream and are estimates only:

Estimated long-term 95%tile - 0.01m3/s

Estimated long-term 50%tile - 0.1 - 0.12m3/s Q

WWTW Flows

The flow modelled for the discharge from the WWTW is 230 lkld for the average flow, with the dry

weather flow (DWF) being 1801/h/d. These correspond to a daily flow average flow of 230m3/d and a

DWF of 180 m3/d for a population equivalent of 1000pe. These flows are then modelled discharging into

the Palatine Stream at 50%ile and 9570ile flows.

The parameters considered for assimilative capacity are BOD, Phosphorous and ammonia and the final

effluent concentrations for the future design loading are set out in the Table 1 below and the resulting

increases in the parameter concentrations in the receiving waters as a result of these discharges are set out in

Table 2 below. The model data for these tables is contained in Appendix A.

Table 3 - Increases in Parameter Concentrations in Receiving waters

River Flow

95%ile Flow

5O%ile Flow 0.2 0.075 0.012

BOD

Carlow County Council 1 Wastewater Treatment

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The BOD concentration of 10 mg/l was used which is a worst case as the WWTW is designed to achieve

this for 95% of the time so on average it should be producing a BOD concentration of less than 5mg/l. The

BOD concentrations in the Palatine stream as a result of the WWTW discharge are 2.1 mg/l at 95%ile low

flow and 0.2 mg/l at median flow which would be consistent with a good water quality status or 4 4 rating

and is an improvement compared with the discharges from the old works. The old works had BOD discharges of between 80 - 100 mg/l due to over loading so with the new WWTW at the future design

loading of IOOOpe discharging at less than IOmg/l, there would be 4-5 times less BOD being discharged

into the stream

Ammonia

An Ammonia concentration of 4 mg/l was used for the 50%ile and 3mg/l for the 95%ile flow as the

WWTW is designed to achieve 5 mg/l for 95% of the time so on average it should be producing an

ammonia concentration of less than 4mg/l. The ammonia concentrations in the Palatine stream as a result

of the WWTW discharge are 0.48 mg/l at 95%ile low flow and 0.075 mg/l at median flow. These are

outside the concentrations for 4 4 rating however they are a significant improvement compared with the

discharges from the old works. The old works had ammonia discharges of between 30 - 40 mg/l due to

over loading so with the new WWTW at the future design loading of IOOOpe discharging at less than Smg/l,

there would be 2-3 times less ammonia being discharged into the stream, thus improving the water quality.

Phosphorous, ORP

A phosphorous concentration of 1 mg/l was used for the dilution modelling this was modelled as an O W

concentration of 0.5mg/l. The O W concentrations in the Palatine stream as a result of the WWTW

discharge are 0.1 mg/l at 95%ile low flow and 0.012 mg/l at median flow. The median flow concentration

would be sufficient to attain a Q4 rating and better however the 95%ile concentration would not achieve

this. The old works had P discharges of between 4 - 8 mg/l as there was no P reduction so with the new

WWTW at the future design loading of 1 OOOpe discharging at less than 1 mg/l, there would be 2-3 times less

phosphorous being discharged into the stream, thus improving the water quality.


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Appendix A - Modelling Data


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Documents

CONTROL PHILOSOPHY - Environmental Protection … PhilosoDhv 312 3 1. OVER VIEW A waste water treatment plant is being up graded at Palantine to treat waste water from the local housing