文档介绍：Research on the Distribution of Bacterium in
Secondary Water-supply Systems

Qing Wu2, Yi Zheng2, 3, Caiyun Zhao2, Yue Zhang2
(2. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072,China
3. Tianjin Finance City Development Co. Ltd., Tianjin 300040, China)

index were analyzed, and control measures and suggestion
Abstract―According to the application of secondary correspondingly were advanced.
water-supply system has been used more and more, the problem
of water pollution in secondary water-supply system turns Ⅱ. MATERIAL AND METHODS
serious. Research was made on distributing rules of bacteria in
secondary water-supply system; the variety and correlativity of A. Sample program
water quality index were analyzed. Index that reflecting total
bacteria number in water-supply system was indicated; control Based on the practice works’
methods and advices correspondingly were brought forward. impersonality condition and maneuverability of locale
experiment, a new flat area was selected as the bacteria
Keywords ―secondary water-supply systems; water quality; distribution research area for secondary water-supply systems.
bacteria There are 5 buildings in the area, all of them were found and
used during 2003~2004, and the population in the area is
I. INTRODUCTION about 12000. The water of 1 to 5th floor is dire