Abstract：An experimental study on the landfill leachate nanofiltration concentrate with a high organic content was performed using a coagulation-heterogeneous Fenton combined process. The effect of different treatment conditions on the removal of organic matter from nanofiltration concentrate was investigated. The working conditions of the combined process were optimized through the orthogonal test, and the feasibility of the effluent reaching the standard under the optimal working conditions was analyzed. The changes in dissolved organic matter and nitrogen pollutant content in the reaction process of the combined process were discussed. The cost of adding chemicals for the combined process was also elaborated. The results show that the optimal treatment conditions of the combined process for COD removal are:the dosage of PFS is 6g/L, the initial pH of coagulation is 7, the dosage of PAM is 25mg/L. The mass ratio of H2O2 to COD is 10, the initial pH of the Fenton reaction is 4, and the mass ratio of catalyst to COD is 16, reaching a COD removal rate of 98.62% under the optimal conditions. After the combined process treatment, the quality of the effluent can be discharged according to the related standard. In the reaction process, the coagulation and sedimentation units can reduce the processing load of the heterogeneous Fenton unit and ensure the discharge of TN and NH4+-N in the effluent of the combined process. The removal rate of HA, FA, and TON from the concentrate is 93.54, 86.80, and 83.98%, respectively. The heterogeneous Fenton unit further oxidizes and decomposes HyI, exhibiting a slightly poor removal effect during the coagulation process, to achieve the COD effluent standard, and its removal rate is 86.02%. Under optimal working conditions, the cost of adding chemicals for the combined process is 47.10yuan/t.
孙越, 张聪慧, 白皓, 刘鑫, 刘思卓. 混凝-异相Fenton工艺处理渗沥液纳滤浓缩液研究[J]. 中国环境科学, 2023, 43(3): 1197-1207.
SUN Yue, ZHANG Cong-hui, BAI Hao, LIU Xin, LIU Si-zhuo. Study on leachate nanofiltration concentrate treated by a coagulation-heterogeneous fenton process. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1197-1207.
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