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Reading Sewage Treatment Works, Reading

Design capacity PE

306,000 effluent, 346,000 sludge

Initial PE


Design peak flow


Peak instantaneous flow


Design maximum flow to treatment


Required maximum flow to treatment on commissioning


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


6mm main inflow; 2mm brewery effluent

Biological nutrient removal

Modified 3-stage Bardenpho process, with additional prefermentation zone

Design phosphorous capture (on centrifuges)


Ferric dosing requirement

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

Final effluent consents - BOD5


Final effluent consents - N-ammonia


Final effluent consents - TSS


Final effluent consents - total phosphorus

1mg/L (annual average limit)

Sludge - TDS


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


Pumping station - electric motors

200kW premium efficiency motor

Project cost

£80 million

Initial design began


Asset Management Plan 3 (AMP3) duration


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


Thames Water

Main contractor

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

Biogas gas engines


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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