饮用水管网生物稳定性分析

Research and analysis for biological stabilization in drinking water distribution system

目的研究饮用水管网生物隐定性指标的变化规律。方法对我国北方某市市区配水管网中细菌总数、生物可同化有机碳(AOC)、生物可降解有机碳(BDOC)等水质指标进行了监测。结果水温是影响管网中细菌总数变化的重要因素,与细菌总数呈正相关关系。AOC与自由余氯间呈正相关关系;与细菌总数间无相关关系。BDOC与自由余氯呈负相关关系;与细菌总数呈一定的正相关关系。结论控制管网水中细菌的再繁殖,应将AOC与消毒剂余量和浊度的控制结合起来进行。管网中细菌、AOC和BDOC、氯及水力条件之间的关系复杂,而且不同的管网间差异较大。

Objective To study the variational rules of biological stabilization. Methods Detection was made on the parameters such as heterotrophic plate counts （HPC） assimilable organic carbon （AOC） and biodegradable organic carbon （BDOC） in a northern city distribution network of China. Results Temperature was the most important factor that infected the result of HPC, it had evidently positive correlation with HPC. AOC content seemed to have weak correlation with free chlorine, and had no correlation with amount of heterotrophic bacteria. BDOC had some negative correlation with free chlorine, and had some positive correlation with amount of heterotrophic. Conclusion The control of AOC, disinfectant residue and turbidity should be combined to be considered in order to control the bacteria regrowth in distribution network. The relationship among bacteria, AOC, BDOC, disinfectant and the hydraulic factor in the distribution network is quite complex, and it＇ s far different from one network to another. The physical and chemical reactions in the network still need further research.