成都市第五水厂自来水中氯仿来源及其含量的时空分布研究

SOURCE AND CONCENTRATION OF CHLOROFORM IN WATER AT DIFFERENT SPACE-TIME IN CHENGDU NO.5 WATER PLANT

本文对成都市供水量最大的第五水厂自来水中氯仿的来源及含量的时空分布进行了研究。研究表明:1、源水在第一和第二平水期均有少量氯仿污染;2、各水期沉淀池出水氯仿含量,均高于源水(P<0.01);3、除丰水期外,滤后水的氯仿含量均低于沉淀池出厂;4、与滤后水相比,各期出厂水的氯仿均有增高趋势;5、各水期管网水氯仿含量的总趋势是:远段>中段>近段>出厂水;6;在本研究条件下,自来水中氯仿含量,以平水期①为最高,平水期②次之,丰水期和枯水期最低。

Source and concentrations of chloroform in water at different space-time in Chengdu No.5 Water Plant are studied. The results showed that there was contamination of chloro form in natural water at both the first and the second period of mean rainfall. The concentrations of chloroform in nature water was lower than those in sediment water at all periods. Contents of chloroform in filtered water were also lower than those in sediment water all the time except in abundant rainfall period. In comparison with filtered water, there was an increase in concentraion of chloroform in finished water at various periods. The concentrations of chloroform in water distribution system at different space-time were as follows: remote>middle>near>waterplant, Although all of the water samples in the year were well qualified to National Standard for Drinking Water, yet there was a direct relationship between chloroform concentration and retained time of water in water distribution system.