Optimization of the coagulation/flocculation of wastewater from oil refineries use of Response Surface Methodology

Spatial variation the degree of contamination in wastewater treatment plant of the refinery company samir can create a fluctuation over time and therefore resulting in a negative effect on the biomass of the biological basin and the coagulation flocculation and subsequently poor degradation of pollutants. optimization of coagulation flocculation process is necessary to improve the processing performance of the treatment plant. this study examines the evaluation and optimization of the physicochemical treatment by coagulation flocculation of wastewater from the company samir,in the perspective of a compromise between efficiency and operational cost. the purpose of using the experimental design methodology and central composite response surface. the results showed that the best regression coefficients (r2) were obtained for the results showed that,the best regression coefficients (r2) were obtained for turbidity,dco,bod5,hc and phenol,reaching values of 0.96,0.95,0.92,0.92 and 0.95,respectively. finally,the optimum values and resultants obtained were ph=6,384 mg/ l of coagulant 14 mg / l of flocculant and,78.52 %,80.47%,85.23%,77.07 % and 75.75 % of turbidity,cod,bod5,hc and phenol removal,respectively.