Removal of Organic Content and Nutrients from Wastewater By Using Rotating Biological Contactor
Rotating biological contactor (RBC) is one of the most effective techniques of wastewater treatment. The purpose of the study is to find out the efficiency of single stage lab-scale RBC for removal of soluble organic substances and nutrients. For the above study a single stage reactor with a total media surface area of 0.14 m2 was utilized with a submergence of 45% and the rotating speed of shaft was kept at 6rpm. Two media profiles such as polypropylene and wood wool have been considered for the above study. The study is based on comparison between efficiencies of media profiles for giving best performance. The parameters that are considered for performance analysis of media profiles are COD, pH, ammonia, nitrate and phosphate. For the present study synthetic wastewater samples with varying concentrations of organic content, nitrate and phosphate has been prepared in the lab and processed through the RBC. Then the effluents were tested for above mentioned parameters. The results obtained shows that, wood wool delivers better results for nutrient removal that is 86.025% nitrate removal and 90.5% phosphate removal, whereas the polypropylene media gives better removal efficiency for organic contents that is,87.132% COD removal rate. The concentration of TDS constantly increases with time. The pH and temperature variation was in between 5.6 to 7.48 and 290C to 320C respectively. For wood wool the TDS variation pattern was different for different wastewater samples.
Keywords: RBC, COD, pH, TDS, Polypropylene media, wood wool.