Modified Biofilm Reactor System for Domestic Wastewater Treatment

The treatment of wastewater using biofilm technologies has been established to be an efficient and proven technology to obtain the desirable quality of effluent. A study was carried out to increase the effluent quality by treating domestic wastewater with biofilm system with the provision of some modification in the conventional Rotating Biological Contactor. To bring about the effective treatment and to check the feasibility of treatment process a lab scale model was developed. The model consists of drums and paddles attached to the shafts with the media filled in it and was operated at varying detention time and varying rotational speed. It was observed that there was remarkable reduction in wastewater parameters and it was because of consumption of organic matter by biofilm growth formed on media filled in rotating paddles and drums. The experimental study of Modified Biofilm Reactor revealed that, the maximum removal efficiency for BOD, COD and TS was observed to be 81%, 76% and 73% at rotational speed of 3 rpm and detention time of 24 hours.