缓流河道污染物关联解析及预氧化混凝特性  

Correlation Analysis and Pre-oxidation Coagulation Characteristics of Pollutants in Slow-flowing Rivers

作　　者：张成若 孙力平 付传奇 王栋 邱春生 林明意 ZHANG Chengruo;SUN Liping;FU Chuanqi;WANG Dong;QIU Chunsheng;LIN Mingyi(School of Environmental and Municipal Engineering,TCU,Tianjin 300384,China)

机构地区：[1]天津城建大学环境与市政工程学院

出　　处：《天津城建大学学报》2019年第5期326-331,共6页Journal of Tianjin Chengjian University

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07106001)

摘　　要：为解决城市缓流水体的黑臭问题,探索高效河道水治理技术,本文以缓流河道水为原水,采用激光粒度散射技术对河道原水颗粒物粒径进行分析,发现河水颗粒物中值粒径的季节性变化趋势与浊度、COD的变化趋势一致,且在6月和9月出现峰值.采用铝系(Al系)和铁系(Fe系)共6种混凝剂进行单独混凝和预氧化混凝实验.结果表明:预氧化可以破坏包裹在颗粒表面的有机涂层,快速改变颗粒Zeta电位,强化混凝作用,减少混凝剂投加量,有效控制河道颗粒物与营养盐等物质的聚集及增长.同时发现Al系混凝剂混凝过程絮体成核与生长的变化速率普遍大于Fe系混凝剂,Fe系混凝剂絮体平均粒径变化速率为6~11μm/min,而Al系混凝剂则普遍大于20μm/min.In order to solve the black and stink problem of urban slow-flowing water body and to explore high-efficiency treatment technology for the river water,slow-flowing river water was collected and the characteristics of particle distribution were investigated by laser particle size scattering technology.The research found that the change of the size of particle pollutants exhibited the same tendency of turbidity and COD of river water,and the pollutants peaked in June and September.Pre-oxidation-coagulation experiments and coagulation experiments were carried out by using six kinds of coagulants of aluminum(Al-based)and iron type(Fe-based).The results showed that pre-oxidation could destroy the organic cover on the surface of the particles,rapidly change the zeta potential of the particles,strengthen the coagulation effect,and reduce the dosage of the coagulant.It was also found that the flocculation nucleation change and growth rate of Al-based coagulant were generally greater than those of Fe-based coagulant during the coagulation process.The average particle size change rate of Febased coagulant was 6~11μm/Min,while Al-based coagulants were generally greater than 20μm/min.

关 键 词：缓流水体 混凝剂 预氧化 絮体粒径 

分 类 号：X52[环境科学与工程—环境工程]