【摘要】 为探究不同供水管道滞流过程中,管网水细菌数量和微生物群落结构对铁释放影响作用,研究依托搭载于实际供水管网中的试验平台,分别采用传统R2A培养法计数可培养腐蚀细菌数量,和高通量测序分析水中微生物群落结构.结果显示,滞流过程中不同管材管网水微生物群落以变形菌门(Proteobacteria)为主,占到86.69%~91.36%.在纲水平上,a-变形菌纲(Alphaproteobacteria)、β-变形菌纲(Betaproteobacteria)和放线菌纲(Actinobacteria)含量较高,可达50%以上.总铁浓度与铁氧化细菌和硫酸盐还原菌的相关性较强,且球墨铸铁管管网水中腐蚀细菌对总铁释放的影响性相较于HDPE管的要大.通过相关性系数分析和RDA分析,门水平上Proteobacteria、Actinobacteria和Acidobacteria以及纲水平上的Alphaproteobacteria、Betaprotebacteria和Bacilli对铁释放起到促进作用.更多还原

【Abstract】 To investigate the influence of total bacteria and microbial community structure on the iron release in water supply pipes under stagnation condition,the research was carried on the pilot platform constructed in actual water supply system.The number of culturable corrosive bacteria was counted by conventional R₂A cultural method,and microbial community structure was analyzed using high-throughput sequencing（454 pyrosequencing）.Results show that Proteobacteria,which account for 86.69%⁹1.36% in pipe biofilms under stagnation condition,are the dominant microbial community in phylum level.In class level,the content of Alphaproteobacteria,Betaproteobacteria and Actinobacteria excesses half of the total amount.The total iron concentration and iron oxidizing bacteria had a strong correlation with sulfate reducing bacteria.In ductile cast iron pipes,the influence of corrosive bacteria on total iron release is greater than that of HDPE pipes.By correlation coefficient and RDA analysis,it is observed that Proteobacteria,Actinobacteria and Acidobacteria in phylum level and Alphaproteobacteria,Betaproteobacteria and Bacilli in class level promote iron release.更多还原