地表水及城市污水二级处理出水中颗粒性质及其混凝特性研究  

Particle property of surface water and secondary effluent of WWTP and its alternation in coagulation-flocculation process

作　　者：韩芸[1] 巨姗姗[1] 王志鹏[1] 杨永哲[1] 王志盈[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院

出　　处：《西安建筑科技大学学报（自然科学版）》2008年第4期527-531,共5页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：陕西省教育厅专项科研计划项目(05JK231);西安建筑科技大学基金项目(JC0811、QN0511)

摘　　要：针对地表水和城市污水二级处理出水中颗粒的Zeta电位和粒径分布特性的差异,利用烧杯混凝实验,对不同混凝条件下水中颗粒性质进行研究.结果表明:在投加混凝剂之后,城市污水二级出水的Zeta电位不随混凝剂投量的增加而发生电位符号的改变,不存在明显的等电点.二级出水混凝后的颗粒粒径分布较地表水而言,存在一较大粒径区间内的物质无法通过常规混凝工艺去除.因此,有必要对二级出水深度处理混凝工艺中混凝剂投量进行优化.The zeta potential and particle size distribution（PSD） were used to characterize the property of particle in surface water and in secondary effluent of municipal wastewater treatment plant（WWTP）. The results showed that the zeta potential and the PSD presented significant difference between the particle in the surface water and in the secondary effluent of WWTP. Thereafter, the particle property in the coagulation-flocculation process were carried out using jar tests. The results showed that the Zeta potential of the particle in the secondary effluent didn＇t change while the isoelectric point couldn＇t be researched when the different amount of coagulant was dosed. The comparison of the PSD between the surface water and the secondary effluent of WWTP showed that the particle in a large size range couldn＇t be removed through conventional coagulation process. Therefore, the results necessitate the determination of the optimal dose of coagulant and flocculant in the coagulation-flocculation process treating the secondary effluent of the WWTP.

关 键 词：地表水 二级出水 ZETA电位 粒径分布 混凝 

分 类 号：X703.1[环境科学与工程—环境工程]