晚期垃圾渗滤液的预处理及参数优化

Pretreatment and Parameter Optimization for Mature Landfill Leachate

采用三氯化铁为混凝剂、聚丙烯酰胺(PAM)为助凝剂对晚期垃圾渗滤液进行混凝沉淀预处理。以单因素和响应面实验考察以初始pH、混凝剂投加量、助凝剂投加量对渗滤液中各类有机物(主指标为COD)及浊度和色度去除的影响。结果表明,单因素实验所得优化条件:初始pH为3~5,FeCl_3投加量为1.0~1.6 g/L,PAM投加量为12~20 mg/L;通过响应面软件分析得出优化条件:初始pH为4,FeCl_3投加量为1.6 g/L,PAM投加量为20 mg/L,在此条件下,有机物的去除率达到63%,可大幅削减难降解有机物的含量,提高渗滤液可生化性,可作为后期生物处理工艺前的预处理。

Ferric chloride （FeC13） and polyacrylamide （PAM） were chosen as coagulant and flocculant respectively for coagulation sedimentation pretreatment of mature landfill leachate. The effect of initial pH, coagulant and flocculant dosage on organic matters （main index was COD）, turbidity and chroma of leachate Was researched by single factor and response swface experiments. The results showed that the optimal conditions of single factor experiment was as follow： the initial pH was 3-5, the dosage of FeC13 was 1.0-1.6 g/L, the dosage of PAM was 12-20 mg/L. The optimal coagulation condition obtained by the response surface analysis was that the initial pH was 4, the dosage of FeCl3 was 1.6 g/L, the dosage of PAM was 20 mg/L and removal rate of the organic reached 63%. Under the optimal condition could substantially reduce the content of refractory organic compounds, improve the biodegradability of leachate and could be used as a pretreatment process before anaphase biological treatment process.