中文摘要：

系统地研究了北京市某城市污水再生处理系统中隐孢子虫、贾第鞭毛虫（以下简称“两虫”）和粪大肠菌的浓度变化，考察了它们的浓度水平以及去除率之间的相关关系。结果表明，在污水再生处理系统中，粪大肠茵的浓度高于两虫，大约是两虫浓度的10000倍。污水再生处理系统对两虫的去除率低于对粪大肠菌的去除率。从整个污水再生处理系统来看，两虫与粪大肠菌呈正相关关系：浓度的相关系数分别为0．91和0．95，累计去除率的相关系数分别为0．96和0、97。但是在各工艺单元内，两虫与粪大肠茵的浓度、累计去除率和单元去除率间的相关系数都在0．03～0．72之间，相关性并不显著。可见，为了保障污水再生利用的安全性，对两虫进行直接检测是十分必要的。

英文摘要：

The concentrations of pathogenic protozoans （Cryptosporidium and Giardia） and fecal coXiform in an urban sewage recXamation treatment system in Beijing were studied. The correXation between initial concentrations and removal efficiencies of the protozoans and fecal coliform was investigated. The results show that the concentration of fecal coliform in the sewage reclamation system is 10 000 times higher than that of the protozoans. The removal efficiencies of the protozoans are lower as well. Moreover, a Xinear correXation exists between the protozoans and fecaX coXiform in the totaX sewage recXamation treatment system. The correXation coefficients of concentration are 0.91 and 0.95, and the correlation coefficients of accumulative removal efficiencies are 0.96 and 0.97, respectively. However, this correlation is not significant in each treatment unit, as the correXation coefficients are all between 0.03 and 0.72. It is necessary to detect Cryptosporidium and Giardia for the safety of sewage recXamation and reuse.