This paper describes the treatment performance of a newly developed compact treatment process, named the “contact biofilter”. It is composed of a submerged biofilter and a granular medium filter. The research experiments on the process were conducted using domestic sewage. It was clearly shown that this process could reduce SS and total BOD in effluent to below 10 and 20 mg/l, respectively, in a short retention time, and it can be used as a secondary treatment process. The organic substances in sewage are effectively recovered as sludge without extensive mineralization.

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