Intermittent Water Supply Impacts on Distribution System Biofilms and Water Quality.
Intermittent Water Supply Impacts on Distribution System Biofilms and Water Quality.
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间歇性供水对分配系统生物膜和水质的影响。
DOI：
10.1016/j.watres.2021.117372
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发表时间：
2021
期刊：
影响因子：
12.8
通讯作者：
Calero Preciado C
中科院分区：
文献类型：
--
作者：
Calero Preciado C
世界各地的饮用水分配系统经常遇到间歇性供水（IWS），这要么是由于持续的操作实践，要么是由于一次性中断。在IWS事件期间，变化的条件可能会影响特有的生物膜，导致附着在管道壁上的有机和无机材料的水力动员，从而导致水质退化。为了研究IWS对饮用水微生物学和理化特性的影响，在实际水力条件下，一个实验规模的氯化管道设施运行了60多天，以允许生物膜的生长，并调查IWS事件后6、48和144小时的流量恢复行为。浊度和金属浓度对水流重新启动有显著的响应，表明生物膜发生了变化，大于6小时的事件会产生更多的浊度响应，因此有变色的风险。当系统重新启动时，压力的增加显示出细胞总数的大幅增加，而随后流量的增加导致浊度和金属浓度的升高。suva254监测表明，较短的非供水时间增加了芳香族有机化合物的风险，从而增加了形成消毒副产物的风险。DNA测序表明，IWS次数的增加导致潜在致病微生物的相对丰度增加，如分枝杆菌、鞘氨单胞菌和真菌青霉枝孢杆菌。总体结果表明，较短的IWS导致较高比例的芳香族有机化合物，这些化合物可能与氯发生反应，并增加形成消毒副产物的风险。然而，通过最小化IWS时间，可以减少与生物膜相关的影响，然而这些是复杂的生态系统，关于如何管理微生物相互作用以最好地确保持续的水安全供应，还有很多有待了解。
Intermittent water supplies (IWS) are routinely experienced by drinking water distribution systems around the world, either due to ongoing operational practices or due to one off interruptions. During IWS events changing conditions may impact the endemic biofilms leading to hydraulic mobilisation of organic and inorganic materials attached to pipes walls with a resulting degradation in water quality. To study the impact of IWS on the microbiological and physico-chemical characteristics of drinking water, an experimental full-scale chlorinated pipe facility was operated over 60 days under realistic hydraulic conditions to allow for biofilm growth and to investigate flow resumption behaviour post-IWS events of 6, 48 and 144 hours.Turbidity and metal concentrations showed significant responses to flow restarting, indicating biofilm changes, with events greater than 6 hours generating more turbidity responses and hence discolouration risk. The increase in pressure when the system was restarted showed a substantial increase in total cell counts, while the subsequent increases in flow led to elevated turbidity and metals concentrations. SUVA254monitoring indicated that shorter times of non-water supply increased the risk of aromatic organic compounds and hence risk of disinfection-by-products formation. DNA sequencing indicated that increasing IWS times resulted in increased relative abundance of potential pathogenic microorganisms, such asMycobacterium, Sphingomonas, and the fungiPenicilliumandCladosporium.Overall findings indicate that shorter IWS result in a higher proportion of aromatic organic compounds, which can potentially react with chlorine and increase risk of disinfection-by-products formation. However, by minimising IWS times, biofilm-associated impacts can be reduced, yet these are complex ecosystems and much remains to be understood about how microbial interactions can be managed to best ensure continued water safe supply.
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