Abstract
There are numerous methods for treatment of effluents of dairy waste/waste water. Rotating Biological Contactors (RBC) is one of the most popular because of its easy operation, low energy usage and less area requirement. RBC is an aerobic treatment process. In the present study RBC is used to treat dairy waste water. Three stage RBC with each tank of total volume 10 litres and working volume of 8 litres is taken and kept in series. Rotational speed of discs is fixed to 40 rpm and with 40% submergence throughout the study. Biofilm formation has been taken because of continuous rotation of RBC discs. Hydraulic Retention Time [HRT] varies with 48,24,12,8 and 4 hrs for initial COD concentration 1000mg/l. Optimum HRT is fixed for 8hrs as per the study. With increasing loading rate of COD to 1500mg/l efficiency is reduced. To fix the COD loading rate, 1000 mg/l was increased to 1100mg/l, 1200 mg/l,1300 mg/l and 1400mg/l. With initial COD concentration of 1000mg/l with different HRT it is found 8hrs with COD removal efficiency (tank 1+tank 2+ tanks 3) was 85%. It is evident from the results that for an optimum HRT of 8 hrs, optimum COD loading rate is 1300mg/l with COD removal efficiency of tank 1+tank 2+ tanks 3 is 94%.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
