Compton Bassett Sewage Treatment Works Background The Compton Bassett plant in Wiltshire treats domestic sewage from the nearby town as well as periodically taking waste from a nearby domestic waste recycling centre with onsite waste washing and cleaning facilities. This waste can have a high concentration of ammonia and during periods of peak discharge the process of de-nitrification causes excess sludge to rise, which then floats on the surface of the Primary settlement tanks. The Overall Objective The floating sludge can block the plant’s downstream processes, therefore its removal is vital to maintaining an efficient operation and ensuring suspended solids consent limits are met. Solution To solve the problem, SPS installed its mobile D25 Dissolved Air Flotation (DAF) unit between the

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