Abstract
This paper deals with the effectiveness of activated sludge process in removing coliforms with respect to operating parameters like MLSS, F/M and SVI. It was observed that operation of biological treatment with high MLSS (3000-3500), low F/M ratio (0.2-0.35) and SVI in the range of 80-150 ml/g tended to result in increased removal of microbial indicators and pathogens. Therefore, it can be taken as a controlling range for higher coliform removal efficiency. Monitoring of these parameters at regular intervals will reveal the total spectrum of plants working efficiency so that operations and maintenance troubles in treatment system can be corrected in time.
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