渗滤液循环回灌出水在混凝处理中的去除特性  

Study on removal characteristic of the recirculated leachate by coagulation

作　　者：薛俊峰[1] 何品晶[1] 邵立明[1] 李国建[1] 

机构地区：[1]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《环境污染与防治》2005年第3期164-167,共4页Environmental Pollution & Control

基　　金：国家"十五""863"计划课题资助项目(No.2001AA644010;No.2003AA644020)

摘　　要：经循环回灌后的渗滤液出水含有大量的腐殖质,其生物降解性差、氨氮含量高,具有类似长填龄填埋层渗滤液的水质特征。用混凝法处理渗滤液循环回灌出水,通过混凝pH、混凝剂种类及其投加量实验,确定了最佳混凝条件;并通过分析混凝处理前后渗滤液循环回灌出水的分子量变化和从出水中分离出的腐殖酸(HA)、富里酸(FA)和Hydrophilic(HyI)三种组分的变化,讨论了混凝法对渗滤液循环回灌出水去除效率不高的原因。研究表明,聚合硫酸铁(PFS)在pH=5、投药量为0.22g/L(以Fe2O3计)的条件下的混凝效果最佳,其对渗滤液循环回灌出水的COD去除率达58.1%。混凝剂对渗滤液循环回灌出水中的HA、FA和HyI组分的去除效果依次为:HA>FA>HyI。The recirculated leachate has the water quality characteristics similar as the old landfill leachate: large amounts of humic substances, low biodegradation and high NH_3-N concentration. The optimum coagulation conditions for the COD removal of recirculated leachate are determined through the experiment of pH, the kind of coagulant and its dosage. The causes of low removal efficiency are discussed by the change of the molecular weight and the change of the isolated fractions of the recirculated leachate through coagulation. The results show that 58.1% removal of COD can be realized by the addition of 0.22 g/L PFS at pH 5. The removal effect of the isolated fractions of recirculated leachate by the coagulation is HA>FA>HyI.

关 键 词：渗滤液循环 混凝处理 出水 回灌 去除特性 最佳混凝条件 COD去除率 生物降解性 分子量变化 聚合硫酸铁 Fe2O3 氨氮含量 水质特征 去除效率 混凝效果 去除效果 混凝法 混凝剂 腐殖质 填埋层 投加量 腐殖酸 富里酸 投药量 

分 类 号：X703[环境科学与工程—环境工程]