Treatment of Grey Water by Modified Rotating Biological Contactor (RBC)

The laboratory model of Rotating Biological Contactor (RBC) used in grey water treatment was a modified one, in respect of the reactor. The reactor had four blades each of size 350 mm × 100 mm attached to a shaft at an angle of 90º. The partially treated effluent from RBC was allowed to pass through three columns of filter connected in series. The experiments were run for two different filter media namely, granite, stone and coal separately. The experiment was conducted for different influent substrate concentrations and different speeds of rotating blades. Among the different speeds of rotational blades in treating grey water, the rotational speed of 3 rpm was found to yield better percent removal of COD, BOD, TSS, turbidity, E. coli, faecal coliforms, and total coliforms than the rotational speeds of 4.5 and 6 rpm.