Sewage treatment system combining upgraded RBC and jet mixed separator

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This research deals with the experimental results obtained by the pilot plant of an upgraded Rotating Biological Contactor(RBC). This is a two-story RBC which is designed to simultaneously achieve the biological oxidation and removal of detached biomass in the trough. The authors constructed a three-stage pilot plant with an octagonal stainless mesh contactor 2 m across to collect the design information of an upgraded RBC.The municipal wastewater treatment was conducted to examine the RBC's performance. According to experimental results, with a contactor rotating speed of 2 rpm, the effluent TOC and NH_4-N concentrations were about 10 g/m^3 and 5 g/m^3, respectively, at the hydraulic loading of 70 L/m^2/d, corresponding to a BOD loading of about 8 g/m^2/d. The electrical power consumption of the RBC was 0.005 kwh/m^2/d at a contactor rotating speed of 1 rpm. A jet mixed separator (JMS) was used as the physico-chemical pre-treatment unit of the RBC.With the addition of a coagulant, simultaneous flocculation and sedimentation of the suspended particles occurred in the JMS.This combined system of the JMS and RBC produced a clean effluent.