Response Surface Methodology for the Removal of Chemical Oxygen Demand through Rotating Biological Contactor

Abstract

Response Surface Methodology (RSM) is a significant Statistical instrument utilized to explore the optimum levels of contribution factor(s). Most important contribution originally in the field of Response Surface Methodology was done by Box and Wilson (1951) and Box and Hunter (1957) originated from British chemical Industry. The effect of two factors, hydraulic retention time and number of discs were observed on the elimination of Chemical Oxygen Demand (COD) through Rotating Biological Contactor (RBC) In the present study. In Response Surface Model (RSM) revealed that number of discs or disc area increment has significant effect on the removal of COD as; corresponding p-values are less than 0.01, while linear and quadratic effect of retention time has no significant effect on the removal of COD as the p values are 0.301 and 0.071 respectively. The best possible optimum level of COD with respect to removal was 51.53984. Furthermore, Response Surface Model elaborated as well, to demonstrate the effect of retention time and number of discs on the removal of COD