Chemically Assisted Sedimentation in an Inclined Tube Clarifier
A demonstration scale inclined tube clarifier was tested at two wastewater treatment plants in Thames Water. The performance of the clarifier was evaluated without coagulant, with coagulant and with coagulant and flocculant. The coagulant improved the removal of suspended solids and BOD and the key parameters were the initial mixing of the coagulant, flocculation time and overflow rate. The volume of sludge produced from the clarifier increased broadly in line with the additional mass of solids removed. Addition of a flocculant to the coagulated wastewater improved the performance of the clarifier and produced an effluent with an average of 50 mg/l suspended solids and 60 mg/l BOD.
KeywordsPhosphorus Hydroxide Sludge Sedimentation Sewage
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