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Research on treatment of landfill leachates by flocculation-adsorption

ZHANG Futao, FANG Shaoming, SONG QuanyuanCivil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083 , ChinaCollege of Materials and Metallurgy, Northeastern University, Shenyang 110004, ChinaDepartment of Chemical Engineering, Zhengzhou Institute of Light Industry, Zhengzhou 450002, China  
Landfill leachate, whose main pollutants are organic matter, heavy metals and ammoniacal nitrogen, is a kind of poisonous, harmful and organic wastewater. The pretreatment of landfill leachate by flocculation-adsor-ption was investigated. Polyaluminium chloride (PAC) was used as the flocculant and its optimum dosage was 500 mg/L. The adsorbent was self-made modified bentonite. Experimental results showed that approximately 79% of CODCr and 46% of ammoniacal nitrogen were removed. As to heavy metals, the removal ratios were from 53% to 98% according to different kinds of landfill leachate.
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