Fate of Escherichia coli experimentally injected in a drinking water distribution pilot system
Fate of Escherichia coli experimentally injected in a drinking water distribution pilot system
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DOI：
10.1016/0043-1354(96)00100-5
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发表时间：
1996-09-01
期刊：
影响因子：
12.8
通讯作者：
Block, JC
中科院分区：
文献类型：
--
作者：
Fass, S;Dincher, ML;Block, JC
大肠菌群和E.饮用水分配系统中的调用可以通过网络中这些细菌的意外污染和/或生长来解释。这最后一点仍然是有争议的，一个实验进行了两个E。呼叫菌株（E. coli O 126：B16和一个从饮用水分配系统分离的菌株）分别注入连续供给饮用水的饮用水分配中试装置中。该工作旨在研究（i）注入的细菌在水相和固有生物膜相之间的分配和（ii）这些细菌的消失或生长的动力学。在最初的5-7天，E.大肠杆菌群体的行为类似：注射细菌的总数比理论上的清除（死亡、溶解、捕食等）下降得更快。然后，这些细菌的数量缓慢增加，在第9-12天，可回收的注射细菌数量变得高于根据理论洗脱计算的可预测数量。这一结果清楚地证明了E.大肠杆菌菌株能够生长在20摄氏度，在没有残留氯的分配网络系统，主要是与本地人口殖民。然而，E.大肠埃希菌株仅为部分和短暂的。版权所有（C）1996 Elsevier Science Ltd
Detection of coliforms and E. call in drinking water distribution systems can be explained by accidental contaminations and/or growth of these bacteria in the network. This last point still remaining debatable, an experiment was carried out with two E. call strains (E. coli O126:B16 and one isolated from a drinking water distribution system) separately injected in a drinking water distribution pilot plant continuously fed with drinking water. The work aimed to study (i) the partition of the injected bacteria between the water phase and the indigenous biofilm phase and (ii) the kinetic of disappearance or growth of these bacteria.Depending on the strain, 1-50% of injected bacteria adsorbed within a few hours to the indigenous bacterial biofilm. During the first 5-7 days, both E. coli populations behaved similarly: the total number of injected bacteria decreased more quickly than the theoretical washout (death, lysis, predation,...). Then the number of these bacteria slowly increased and at day 9-12, the number of recoverable injected bacteria became higher than the predictable number calculated from the theoretical washout. This result clearly proves that both E. coli strains are able to grow at 20 degrees C in the absence of residual chlorine in a distribution network system largely colonized with an autochthonous population. However, colonization of the network by E. coli strains was only partial and transient. Copyright (C) 1996 Elsevier Science Ltd