中文摘要：

以上海市某水厂实际供水管网为研究对象，对其管网水中异养菌生长水平和其它相关物理、化学指标的变化规律进行了检测分析．结果表明，在所研究供水管段中，悬浮水中所含细菌主要是以有机物为营养的异养菌；随着供水距离延长，悬浮水中BDOC逐渐增加，伴随异养菌数量和浊度呈增加趋势；在研究管段中，悬浮水中各形态氮的变化表明水中存在一定的亚硝化作用，而且亚硝酸盐含量同异养菌具有相同的升高变化趋势；管网水中总磷含量与异养菌数量也随供水距离延长同时增加．

英文摘要：

The growth of heterotrophic bacteria and the variation of some physical chemical parameters were studied in a full-scale water distribution system in Shanghai. The results showed that, in the water distribution system in Shanghai, heterotrophic bacteria fed on organics were the major population in pipe water. With the water supply distance extending, BDOC in water increased and correspondingly both the number of heterotrophic bacteria and turbidity increased. In addition, the changes of different forms of nitrogen showed the existence of nitritification in water, and the amount of nitrite increased along the number of heterotrophic bacteria. Our results also showed that the increase of total phosphorus correlated well with that of heterotrophic bacteria in pipe water.