加载磁絮凝技术预处理垃圾渗滤液的研究  

Study on landfill leachate pretreatment by magnetic flocculation

作　　者：曹羡 梅凯[2] 李先宁[1] 

机构地区：[1]东南大学能源与环境学院,南京210096 [2]南京工业大学城建学院,南京210009

出　　处：《东南大学学报（自然科学版）》2017年第5期956-962,共7页Journal of Southeast University：Natural Science Edition

基　　金："十二五"国家水体污染控制与治理科技重大专项资助项目(2012ZX07101-005);中央高校基本科研业务费专项资金资助项目(2242016K41042);江苏自然科学基金资助项目(BK20171351);东南大学优秀博士学位论文培育基金资助项目

摘　　要：利用加载磁絮凝技术对垃圾渗滤液进行预处理试验,考察混凝剂PAC和助凝剂PAM投加量、pH值、磁粉Fe_3O_4投加量、磁场强度、药剂投加顺序等因素对试验的影响.结果表明,在pH为8.0,PAC投加量为600 mg/L,PAM投加量为0.25 mg/L,磁粉投加量为750 mg/L,磁场强度为150m T条件下,先投加PAC再加入磁粉,30 s后投加PAM时,混凝效果最佳,COD的去除率为55.86%,氨氮的去除率为36.13%,浊度的去除率为88.91%.磁絮凝与常规工艺的对比试验表明,投加磁粉对于COD的去除有良好的效果,基本可以取代PAM的作用,但去除氨氮的效果低于PAM.The technology of magnetic flocculation was used to pretreat the landfill leachate,the testing factors including the dosages of PAC（ polyaluminium chloride）,PAM（ polyacrylamide） and magnetic powder Fe_3O_4,the influences on p H,magnetic field strength and dosing sequence. The removal rates of COD（ chemical oxygen demand）,ammonia nitrogen and turbidity were obtained by55. 86%,36. 13% and 88. 91%,respectively,under the optimal conditions when p H was 8. 0,PAC was 600 mg/L,PAMwas 0. 25 mg/L,magnetic powder dosage was 750 mg/L,and magnetic field strength was 150 m T. The comparative results between magnetic flocculation test and chemical flocculation tests showthat the magnetic powder for replacing PAMis beneficial to test COD removal,but it is ineffective in ammonia removal.

关 键 词：加载磁絮凝 垃圾渗滤液 絮凝剂 磁粉 

分 类 号：X505[环境科学与工程—环境工程]