COD adsorption capacity of the activated sludge — Its determination and application in the activated sludge process |
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| Authors: | K. N. Tan H. Chua |
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| Affiliation: | (1) Jurong Sewage Treatment Works, Sewerage Department, Ministry of the Environment, Pioneer Road, Jurong Town, Singapore;(2) Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong |
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| Abstract: | Proper control of the activated sludge process is essential in ensuring production of good effluent. COD adsorption capacity (CAC) of the activated sludge could be used as a control parameter. CAC is determined by mixing the activated sludge with the settled sewage and measuring the instantaneous COD reduction per unit mass of activated sludge. CAC measures substrate removal by physical adsorption and reflects the quality of the activated sludge. CAC of a healthy activated sludge increases with the flow along the aeration units. CAC could be used for process decision on variation in air supply and feed pattern to the aeration units. In a modified process to cope with sludge bulking problem, CAC could be used to estimate the air supply to the aeration unit which is merely used for reaerating the returned sludge. |
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