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Reading Sewage Treatment Works, Reading

Design capacity PE

306,000 effluent, 346,000 sludge

Initial PE

284,000

Design peak flow

4,000L/sec

Peak instantaneous flow

3,490L/sec

Design maximum flow to treatment

1,805L/sec

Required maximum flow to treatment on commissioning

1,574L/sec

Inflow - ammonia-N:TKN ratio

Crude sewage - 60%; brewery waste - 22%

Inflow - inert solids:TSS ratio

Crude sewage - 15%; brewery waste - 81%

Inflow - COD fractions (crude sewage)

5% unbiodegradable and soluble, 13% unbiodegradable and particulate, 20% biodegradable and soluble

Inflow - COD fractions (brewery waste)

16% unbiodegradable and soluble, 54% biodegradable and soluble, 25% biodegradable and colloidal

Screening

6mm main inflow; 2mm brewery effluent

Biological nutrient removal

Modified 3-stage Bardenpho process, with additional prefermentation zone

Design phosphorous capture (on centrifuges)

75%

Ferric dosing requirement

At least 150kg/d as iron; not expected to exceed 300kg/d as iron (at anticipated loads)

Final effluent consents - BOD5

5mg/L

Final effluent consents - N-ammonia

2mg/L

Final effluent consents - TSS

30mg/L

Final effluent consents - total phosphorus

1mg/L (annual average limit)

Sludge - TDS

7-8%

Sludge - microbiological standards

Salmonella - nil; other pathogens - log6 reduction

Odour limits

<5 odour units (at site boundary)

Pumping station - pumps

5 x screw centrifugal impeller pumps

Pumping station - throughput capacity

500L/sec per pump

Pumping station - total discharge head

26m

Pumping station - electric motors

200kW premium efficiency motor

Project cost

£80 million

Initial design began

1998

Asset Management Plan 3 (AMP3) duration

2000-05

Site remediation began

January 2001

Detailed design phase

January 2001

Construction began

March 2002

Pumping station refurbishment commenced

March 2003

CEEQUAL Award of Excellence

9 September 2003

25% flow switched

22 March 2004

Full flow switched

May 2004

CHP system commissioned

May 2004

New EU discharge standards effective

From March 2005

IAS/OAS 'Best Bespoke Industrial Development' Award

13 October 2004

Official opening

18 January, 2005

Owners

Thames Water

Main contractor

Target Alliance (a partnership of Thames Water with the Black & Veatch / Taylor Woodrow JVC)

Biogas gas engines

Jenbacher

CHP O&M contractor

Clarke Energy UK

Odour control subcontractor

Alderley Systems

Odour control & desludging equipment

Chemviron; Gleeson

Optimisation software

Envirosim Associates

Pumping station refurbishment

Engenica (main contractor), Hidrostal (pumps), WEG Electric Motors (electric motors)
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