磁混凝对黑臭水体中污染物的去除特性  

Characteristics of Magnetic Coagulation for Pollutants Removal from Black and Odorous Water

作　　者：方华[1,2] 杨顺 赵金宇 李吴波 于江华[1,2] FANG Hua;YANG Shun;ZHAO Jin-yu;LI Wu-bo;YU Jiang-hua(Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies,School of Environmental Science&Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,China;Jiangsu Key Laboratory of Atmospheric Environmental Monitoring&Pollution Control,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学环境科学与工程学院大气环境与装备技术协同创新中心,江苏南京210044 [2]南京信息工程大学江苏省大气环境监测与污染控制高技术研究实验室,江苏南京210044

出　　处：《中国给水排水》2023年第15期70-74,共5页China Water & Wastewater

基　　金：国家重点研发计划项目(20180300048);江苏省研究生实践创新计划项目(SJCX20_0306)。

摘　　要：在工艺优化基础上,深入开展了混凝、磁混凝、回流磁泥混凝3种工艺对黑臭水体中污染物的去除特性与机制研究。结果表明,微米级磁种粒径对磁混凝除浊效果影响不显著,快搅阶段投加磁种和回流磁泥的除污效果较好。磁混凝和回流磁泥混凝主要通过提高不溶性污染物的去除能力来强化对黑臭水体中氨氮、总磷和COD等指标的去除效果。磁混凝和回流磁泥混凝可形成更为致密、紧实的磁性絮体,可大幅提升沉降速度。回流磁泥可使水中微粒表面电位显著下降,大幅减少混凝剂投加量。This paper investigated the characteristics and mechanism of three processes including coagulation,magnetic coagulation and magnetic coagulation with mud reflux for pollutants removal from black and odorous water on the basis of process optimization.The particle size of micron magnetic seeds had no significant effect on the turbidity removal performance of magnetic coagulation,and the pollutants removal performance was better when adding magnetic seed and refluxing magnetic mud in rapid stirring stage.Magnetic coagulation and magnetic coagulation with mud reflux enhanced the removal performance of ammonia nitrogen,total phosphorus and COD from black and odorous water by improving the removal ability of insoluble pollutants.Magnetic coagulation and magnetic coagulation with mud reflux formed denser and more compact magnetic floc,which greatly improved the settling velocity.The returned magnetic mud significantly decreased the surface potential of colloidal particles in water,and thus greatly reduced the dosage of coagulant.

关 键 词：磁混凝 回流磁泥 黑臭水体 除污效能 混凝机制 

分 类 号：TU992[建筑科学—市政工程]