Fenton工艺处理垃圾渗滤液MBR出水的特性研究

Study on the Fenton Process Treating MBR Effluent for Landfill Leachate

研究采用Fenton工艺处理垃圾渗滤液MBR出水,考察不同因素对Fenton工艺去除垃圾渗滤液中有机物的影响,考察了不同影响因素对Fenton工艺中氧化作用和混凝作用的影响。研究结果表明:腐殖酸的降解是Fenton工艺有效处理垃圾渗滤液MBR出水的重要原因。H_2O_2浓度对Fenton工艺去除有机物有着最显著的影响。Fenton工艺主要通过氧化作用去除渗滤液中有机物。初始pH值为5.0,氧化时间为120 min,H_2O_2浓度为240 mmol/L,Fe^(2+)浓度为60 mmol/L时,Fenton工艺对垃圾渗滤液MBR出水的去除效果最好,COD去除率可达到85%以上,HA去除率为94.1%。三维荧光图谱分析表明类富里酸和类胡敏酸是垃圾渗滤液MBR出水的主要成分。Fenton反应后胡敏酸和富里酸的含量和缩合度均发生不同程度的下降,从而提高了渗滤液可生化性。

This study investigated the effects of reaction conditions on pollutant removal efficiency in Fenton process treating MBR effluent for landfill leachate. The effects of reaction conditions on oxidation and coagulation of Fenton process were also studied. Results showed that the effective degradation of humic acid（HA） was a key reason for the treatment of MBR effluent by Fenton process. H_2O_2 concentration had the most influence on the organic pollutant removal effect. The results indicated the optimal conditions to be 5.0 of initial pH,120 min of oxidation time,240 mmol/L of H_2O_2 concentration and 60mmol/L of Fe^（2＋） concentration. Above 85% COD removal rate and about 94.1% HA removal rate were achieved under the optimal conditions. Three-dimensional fluorescence spectrum analysis showed that fulvic acid and humic acid were the main components of MBR effluent in landfill leachate. The content and condensation degree of fulvic acid and humic acid in the landfill leachate decreased after Fenton process,which could increase the biodegradability of landfill leachate.