Author(s)

A. Mohseni-Bandpi & Z. Yousefi

Abstract

The performance of selector to solving bulking sludge problem in activated sludge process A. Mohseni-Bandpi & Z. Yousefi Department of Environmental Health Engineering, Health Faculty, Sari, Iran. Abstract An investigation was carried out to evaluate the performance of selector in activated sludge under extended aeration mode to control bulking sludge problem. The first phase of this study a bench scale of extended aeration process without a selector was run to evaluate the possible formation of bulking sludge. The results of this part show that SVI value was 200-600 ml/g. After using hydrochloride powder as a chemical material for controlling bulking sludge problem, the SVI reduced to 50 to 80 ml/g. After installing a selector zone this value was corrected to 80 to 120 ml/g. The second phase of this research, a pilot scale extended aeration process was designed and constructed with plastic material and a selector was installed in head of aeration unit. The characteristics of

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