摘要：The laboratory model of two-stage Rotating Biological Contactor (RBC) which was used in the present studyis a modified one, with a provision to vary the speed of rotating blades. Grey wastewater was used to studythe performance of the modified rotating biological contactor. The reactor had four rotating blades in eachstage, having the size of 300mm × 100mm × 10mm, attached perpendicular to the shaft. The experimentwas conducted for different influent COD loads and different speeds of rotating blades. Among the differentspeeds of rotational blades in treating grey water, the rotational speed of 3 rpm was found to yield betterpercent removal of COD at 95.85% as maximum, whereas against the rotational speeds of 4.5 and 6 rpm,the treatment efficiency is 92.15% and 90.90% respectively.
