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供水管网中微生物生长和生物膜形成可对管网水质和运行造成重要影响.利用MPN-Griess方法检测了上海某供水系统生物膜中氨氧化细菌的数量,分析了管网中氨氧化细菌与管网水中硝化作用和消毒剂之间的相关性.通过室内实验分析了氨氧化细菌和异养菌对氯胺消毒剂的抗性和消耗影响.结果表明,管网中氨氧化细菌数量(以生物膜干重计)在1.0×102~4.3×105MPN/g之间,与氨氮、亚硝酸盐氮和硝酸盐氮浓度的相关系数分别为-0.563、0.603和-0.563;与总氯和一氯胺浓度的相关系数分别是-0.659和-0.571.氨氧化细菌对氯胺消毒剂的抗性明显高于异养菌,对氯胺消毒剂的消耗能力也强于异养菌.
Microbial growth and biofilm formation in the water distribution network can have a significant impact on the quality and operation of the pipe network.The number of ammonia-oxidizing bacteria in a biofilm of a water supply system in Shanghai was measured by MPN-Griess method, The relationship between nitrification and disinfectant in pipe network water was studied.The effects of ammonia oxidizing bacteria and heterotrophic bacteria on the resistance and consumption of chloramine disinfectant were analyzed by laboratory experiments.The results showed that the number of ammonia oxidizing bacteria Biofilm dry weight) of 1.0 × 102 ~ 4.3 × 105mpN / g, with the correlation coefficient of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen concentrations were -0.563,0.603 and -0.563; and total chlorine and chlorine The correlation coefficient of amine concentration was -0.659 and -0.571, respectively.Ammonia-oxidizing bacteria were significantly more resistant to chloramine disinfectant than heterotrophic bacteria, and also had more depletion ability to chloramine disinfectant than heterotrophic bacteria.