In the present study, a coagulation process was\nused to treat paper-recycling wastewater with alum coupled\nwith poly aluminum chloride (PACl) as coagulants. The\neffect of each four factors, viz. the dosages of alum and\nPACl, pH and chemical oxygen demand (COD), on the\ntreatment efficiency was investigated. The influence of these\nfour parameters was described using response surface\nmethodology under central composite design. The efficiency\nof reducing turbidity, COD and the sludge volume index\n(SVI) were considered the responses. The optimum conditions\nfor high treatment efficiency of paper-recycling\nwastewater under experimental conditions were reached\nwith numerical optimization of coagulant doses and pH, with\n1,550 mg/l alum and 1,314 mg/l PACl and 9.5, respectively,\nwhere the values for reduction of 80.02 %in COD, 83.23 %\nin turbidity, and 140 ml/g in SVI were obtained.
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