垃圾渗滤液深度处理及混凝污泥有机物释放研究  

Advanced Treatment of Landfill Leachate Biochemical Effluent and the Release Characteristics of Organics from Coagulated Sludge

作　　者：田夏迪 张树军[1,2] 吕心涛 曲之明 谷鹏超 王佳伟[1,2] 郑冰玉 TIAN Xia-di;ZHANG Shu-jun;LU Xin-tao;QU Zhi-ming;GU Peng-chao;WANG Jia-wei;ZHENG Bing-yu(Beijing Drainage Group Co.Ltd.,Beijing 100124,China;Beijing Engineering Research Center of Wastewater Resource,Beijing 100124,China)

机构地区：[1]北京城市排水集团有限责任公司,北京100124 [2]北京市污水资源化工程技术研究中心,北京100124

出　　处：《中国给水排水》2023年第19期33-40,共8页China Water & Wastewater

基　　金：国家重点研发计划项目(2016YFC0401103);北京市科技计划项目(Z181100005518003)。

摘　　要：针对垃圾渗滤液厌氧氨氧化出水中有机物残留的问题,提出了“混凝—气浮—高级氧化”的无膜法工艺改造路线,并对混凝过程进行了深入研究;考察了混凝剂种类和投加量、pH等对有机物去除的影响,并进行中型正交试验;另外还分析了混凝前后有机物的变化以及压滤脱水后混凝污泥中有机物的释放规律。混凝工艺的最佳条件如下:pH=5.75、聚合硫酸铁(PFS)投加量为1 500 mg/L、聚丙烯酰胺(PAM)投加量为2 mg/L,在此条件下TOC、COD、UV_(254)和色度的去除率分别可达到79.84%、67.57%、88.55%和95.00%;中型正交试验结果表明,对混凝工艺影响最大的因素是pH,混凝工艺最佳条件与小试结果一致,证明该试验结果放大可信;三维荧光数据分析表明,混凝几乎去除了全部的腐殖酸;凝胶渗透层析(GPC)结果表明,处理后有机物的分子质量整体变小;另外,混凝污泥的有机物释放量较小且释放速率逐渐趋于稳定,污染物二次释放的风险较小。This paper proposed a non-membrane process consisting of coagulation,air floatation and advanced oxidation,and investigated the coagulation process,so as to solve the problem of organic residues in the effluent from anaerobic ammonia oxidation for treating landfill leachate.The effects of factors such as coagulant type,coagulant dosage and pH on the removal of organic matter were investigated,and an pilot-scale orthogonal test was carried out.In addition,the change of organic matter before and after coagulation and the release characteristics of organic matter in coagulated sludge after pressure filtration dehydration were also analyzed.The optimal coagulation process were as follows:the pH was 5.75,the dosage of polymerized ferric sulfate(PFS)was 1500 mg/L and the dosage of polyacrylamide(PAM)was 2 mg/L.Under these conditions,the removal rates of TOC,COD,UV_(254)and chroma reached 79.84%,67.57%,88.55%and 95.00%,respectively.The pilot-scale orthogonal test results showed that pH was the most important factor affecting the coagulation process,and the optimal operating conditions were consistent with the bench-scale test results,which proved that the experimental results were reliable.The three-dimensional fluorescence data showed that coagulation removed almost all of the humic acid.The results of gel permeation chromatography(GPC)showed that the molecular weight of organic matter decreased after coagulation treatment.In addition,the amount of organic matter released from the coagulated sludge was small and the release rate gradually tended to be stable,indicating that the risk of pollutants secondary release was small.

关 键 词：垃圾渗滤液 无膜法 混凝 有机物深度去除 

分 类 号：TU992[建筑科学—市政工程]