Advanced treatment of landfill leachate by ultraviolet catalytic persulfate
HUANG Li-kun1, LI Zhe1, WANG Guang-zhi2, ZHAO Wen-li2, XU Yuan-yuan1, WANG Dong-dong2
1. School of Food Engineering, Harbin University of Commerce, Harbin 150076, China; 2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
Abstract:To study the treatment characteristics of leachate biochemical effluent from refuse incineration plant, the effects of advanced treatment of landfill leachate by ultraviolet (UV) system, single persulfate (PS) system and ultraviolet/persulfate (UV/PS) system were compared. The results showed that the removal efficiency of UV/PS system was better than that of the other two systems. When the initial concentration of humic acid was 200mg/L, the dosage of PS was 25mmol/L, and the initial pH value was 4, the maximum removal rate of UV254 was 89.62%, the maximum removal rate of TOC was 76.17%. The effects of temperature, initial pH value and dosage ratio of chemicals on the treatment of leachate by UV/PS process were studied. It’s found that the treatment effect was good. The optimal conditions were as follows: temperature 35℃, pH value 4, dosing ratio 2, running for 24h, the maximum removal rate of COD was 82.64%, and the maximum treatment efficiency of TOC was 66.69%. At the same time, the removal ability of the system was in accordance with the pseudo-second-order kinetic equation. This paper can provide reference for advanced treatment of leachate in waste incineration plant.
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