垃圾渗滤液的Fenton氧化预处理研究

Pretreatment of landfill leachate by Fenton process

采用Fenton氧化法对垃圾渗滤液进行预处理,考察了渗滤液初始pH值、H2O2和FeSO4.7H2O投加量、H2O2/Fe2+投加的物质的量比及氧化反应时间等对Fenton氧化处理效果的影响,获得Fenton氧化处理垃圾渗滤液的最佳工艺条件:初始pH=3.0,H2O2投加量为5.0 mL.L-1,FeSO4.7H2O投加量为3.48 g.L-1,H2O2/Fe2+物质的量比为4-1,反应时间为1.5 h。最佳条件下处理后垃圾渗滤液COD为5 220 mg.L-1,COD去除率达57.8%。凝胶渗透色谱和三维荧光光谱分析结果表明,垃圾渗滤液中主要含有腐殖酸类大分子物质,经Fenton氧化后降解变成小分子化合物。

Fenton process was tried to pretreat landfill leachate in this paper.The effect of operating conditions such as initial pH,H2O2 dosage,FeSO4-7H2O dosage,H2O2 to Fe2＋ molar ratio,and reaction time on the efficacy of Fenton process was investigated.The optimum operating conditions of Fenton process were as follows： initial pH was around 3.0,H2O2 dosage was 5.0 mL·L-1,FeSO4-7H2O dosage was 3.48 g·L-1,the molar ratio of H2O2 to FeSO4-7H2O was 4：1,and reaction time was 1.5 h.The landfill leachate COD after Fenton process under the optimum conditions decreased to 5220 mg·L-1 and COD removal reached 57.8%.Gel permeation chromatography（GPC） and three-dimensional fluorescent spectroscopy（3DEEM） results indicated that large molecular humic matters,the major components in landfill leachate,were removed and decomposed into small molecular compouds after Fenton process.