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Pretreatment of Landfill Leachate by Coagulation-Adsorption Process

SHEN Yao-liang 1, YANG Quan-da 1, WANG Bao-zhen 2 (1.Depart. of Environ. Protection, Suzhou Institute of Urban Construc. and Environ. Protection, Suzhou 215011, China; 2. School of Munic. and Environ. Eng., Harbin Univ. of Civil Eng. and Archit  
A study on the pretreatment of landfill leachate by coagulation-adsorption was carried out and reported in this paper. The results showed that the effective removal of COD and heavy metals could be obtained by using PAC as coagulant and processed coke as absorbent. With PAC dosage of 400 mg/L and processed coke dosage of 8~10 g/L, 58.9% of COD and about 60% of heavy metals removals were achieved, of which the removal of Cu was nearly 100%. The mutually complement action of coagulation and adsorption processes was found which would promote the stable and flexible operation. In addition, 68% of color reduction and adsorption processes was found which would promote the stable and flexible operation. In addition, 68% of color reduction was achieved by coagulation at PAC dosage of 400 mg/L. In adsorption process, the obvious competitive adsorption phenomenon was observed and COD possessed a strong competitive potential because of its high concentration in leachate.
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