操作条件对污水再生处理絮凝工艺中病原性原虫去除特性的影响  

Effect of Reaction Conditions on the Removal of Pathogenic Protozoan from Secondary Effluent in Flocculation Process

作　　者：张彤[1] 胡洪营[1] 吴乾元[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》2007年第8期1752-1758,共7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(20510076)

摘　　要：再生水中的隐孢子虫和贾第鞭毛虫会通过直接或间接的方式影响人体健康．与传统的消毒手段相比，絮凝、澄清、过滤等污水深度处理工艺能有效地控制两虫污染．本研究主要考察了絮凝剂种类、投加量、pH和温度等操作条件对污水再生处理絮凝过程中病原性原虫去除特性的影响．结果发现，污水絮凝过程中，pH为6—8时两虫的去除率较高，低温条件不利于两虫的去除．氯化铁对两虫的去除率随投加量的增加而增加；硫酸铝絮凝和聚合氯化铝的最佳投加量分别为70mg/L和20mg/L左右．Cryptosporidium and Giardia in reclaimed water are endangering the health of human beings by direct and indirect ways. Compared with traditional disinfection measures, flocculation, clarification and filtration can remove the pathogenic protozoan from wastewater more effectively. The factors affecting the removal of pathogenic protozoan from secondary effluent in flocculation process, including type and dosage of flocculant, pH, temperature and other reaction conditions were studied. The experimental results showed that the effectiveness of pathogenic protozoan removal appeared to be good at pH 6 - 8 and bad at low temperature. The effectiveness increased with the increase of ferric chloride dosage. Aluminium sulphate and poly aluminium chloride gave better performance in removal of pathogenic protozoan at the dosage of 70 mg/L and 20 mg/L respectively.

关 键 词：隐孢子虫 贾第鞭毛虫 污水再生利用 絮凝 操作条件 去除特性 

分 类 号：X172[环境科学与工程—环境科学]