污水再生处理絮凝工艺去除病原性原虫的机制分析  

Removal Characteristics and Mechanism of Cryptosporidium and Giardia from Secondary Effluent in Flocculation Process

作　　者：张彤[1] 胡洪营[1] 谢兴[1] 宗祖胜[1] 

机构地区：[1]清华大学环境科学与工程系环境模拟与污染控制国家重点联合实验室,北京100084

出　　处：《环境科学》2008年第8期2287-2290,共4页Environmental Science

基　　金：国家自然科学基金项目(20477021);国家自然科学基金-JST重大国际合作项目(20521140076)

摘　　要：通过考察在不同的絮凝剂种类、投加量、pH和温度等操作条件下隐孢子虫和贾第鞭毛虫(以下简称'两虫')的去除特性,探讨了污水深度处理絮凝工艺去除病原性原虫的作用机制.研究发现,污水经絮凝处理后,水样中胶体的平均ζ电位与2种荧光微球(两虫替代物)去除率和剩余浊度的线性相关度不高(R=0.49、0.48、0.65);而2种荧光微球之间的去除率线性相关性较高(R=0.99),并且与水样剩余浊度的变化趋势呈一定的指数相关关系(R=0.92、0.95).因此,在本研究的各种絮凝工况下,卷扫网捕是去除病原性原虫和浊度的重要作用机制.在相同操作条件下,贾第鞭毛虫的去除率大于隐孢子虫.Removal of Cryptosporidium and Giardia under different reaction conditions,such as flocculent dosage,pH,temperature,were investigated to study the removal characteristic and mechanism of pathogenic protozoan in a flocculation process.The experimental results showed that after flocculation,there were not good linear relationships between average ζ potential of colloid in water samples and removal efficiency of the two kinds of microspheres,the surrogates of the pathogenic protozoan,or the residual turbidity（R=0.49,0.48,0.65）.But the linear relationship between the removal of the two kinds of microspheres was obvious（R=0.99）,and there were also good exponential relationships between the removal of microspheres and residual turbidity（R=0.92,0.95）.Sweep flocculation appeared to be an important mechanism for protozoan removal under the conditions in this study.The removal efficiency of Giardia was higher than that of Cryptosporidium under same reaction conditions.

关 键 词：隐孢子虫 贾第鞭毛虫 污水再生利用 絮凝 

分 类 号：X172[环境科学与工程—环境科学]