Treatment of landfill leachate by coagulation-flocculation with FeCl3: process optimization using Box–Behnken design

Landfill leachate is a complex mixture containing toxic and recalcitrant substances with considerably low bod_5/cod indicating the necessity and difficulty of its treatment. amongst treatment processes, integrated separating-destructive processes are promising gones. in this way, suspended and colloidal particles get separated in a separating process, while the soluble fraction under goes separating process; probably an coagulation-flocculation process. in this study, coagulation process using ferric chloride was employed as apre-treatment process for landfill leachate. elimination of cod and turbidity was investigated using response surface method (rsm) with box-behnken design. design experiments were modeled and analysed. in optimum conditions (7.2g/l fecl_3 and 0.2ml/l flocculant) the average cod removals were occurred approximately 45%.