SMALL-SCALE SEWAGE PLANT EXPERIMENT BY PRETREATMENT AND METHANIZATIONOF SUSPENDED-SOLIDS

An experiment has been carried out at a test plant for small-scale sew age that consists of a pretreatment unit, a suspended solid (SS) metha nization reactor with a membrane module, and a nitrogen removal unit. after continuous experiments, the SS removal rate in the pretreatment unit was found to be more than 80%. The reduction rate of the volatile suspended solids (VSS) in the SS methanization reactor was 51-79% und er temperature conditions of 25-35 degrees C and HRT 4.2-10.2 d, and t he effluent from the nitrogen removal unit was stable at BOD of less t han 2 mg/l and T-N of less than 5 mg/l.