Investigation of Coagulation and Clotting Process of Purge of Environmental Pollutants of Paper Mill's Wastewater

Paper mill’s wastewater is the most pollutant industrial wastewaters. The effluent causes production sludge، scum formation and loss of aesthetic beauty in the environment. They also increase the amount of toxic substances in the water which causes death to the zooplankton and fish. The present research investigated the effect of coagulant of PACL for reduction of the pollutants in paper mill wastewater. For reduction of the pollutants the quantity and quality of wastewater investigated. This study showed that this wastewater has chemical oxygen demand (COD) 3523 mg/l and turbidity= 872. In this test، parameters of turbidity، COD، total solid (TS)، optimum pH and dosage of coagulant determined. According to data obtained from studies optimum pH and dosage of PACL were obtained to be 7، 785 mg/l، respectively. The results of the present study revealed that coagulant of PACL could reduce 90% of TS، 88% of COD and 93% of turbidity in paper mill wastewater