供水管网中细菌再生长影响因素的研究

Investigation of the Influencing Factors on Bacterial Regrowth in Water Distribution System

在对北方某市进行大量水质调研的基础上,分析了细菌总数(Heterotrophicplatecount,HPC)与温度、余氯、三氯甲烷、可同化有机碳(assimilableorganiccarbon,AOC)、磷的关系。研究表明:温度是影响细菌总数的关键性因素;细菌总数随总余氯的减少而急剧增加;三氯甲烷与细菌再生长有一定的相关性;AOC与细菌总数相关性不高,不能仅用AOC来评估管网的生物稳定性;总磷与细菌总数有很好的相关性,可以作为该市水质生物稳定性的标志,水厂可通过工艺的改进来控制TP<3μg/L,以达到水质的生物稳定性。

In this paper, the relationship between HPC, temperature, residual chlorine, chloroform, AOC and phosphorus was investigated based on lots of experiments. The result indicated that temperature was the key influencing factor on bacterial regrowth. HPC increased heavily with the total residual chlorine decreasing. Chloroform was related to bacteria. AOC content was less correlative with HPC, and phosphorus was more correlative with HPC, phosphorus can be the symbol of biological stabilization. So, water plants can improve their techniques to limit the phosphorus in the outlet of the plant to 3μg/L for biological stabilization.