Treatment of Sewage by using Two-Stage Rotating Biological Contactor (RBC)

Abstract

The rotating biological contactor (RBC) process offers the specific advantages of a bio-film system in treatment of wastewater for removal of soluble organic substance. The present review of RBC focus on parameter like materials used in fabrication of RBC Unit, media used for development of bio-film, HRT, organic and hydraulic loading rate, influent wastewater characteristics, Analysis treated wastewater characteristics, submergence variation, constant RPM, sizing of the reactor. In present study, a lab scale two stage RBC reactor is fabricated to treat sewage. Here work is carried out to check the performance and efficiency of two stage RBC reactor to treat sewage by varying submergence and maintaining constant speed (RPM).From present study, the two stages RBC is varied with 2 submergences for constant speed of disc as 4 RPM with different COD loading rate at optimum HRT. The result obtained when the disk submergence was 40%, the COD removal efficiency for tank1 was 90.31% and for tank1+tank2 were 93.8%. Hence optimum COD loading rate was 640 mg/L at optimum 2hrs HRT and when the disk submergence was 45%, the COD removal efficiency for tank1 was 90.76 % and for tank1+tank2 were 94.6 %. Hence optimum COD loading rate was 520 mg/L at optimum HRT of 1 hr.

Keywords: Two stage Rotating Biological contactor (RBC), sewage, Optimum COD Loading Rate and HRT.