上海 2012年8月9日 訊 /生物谷BIOON/ --和一般大眾的想法相反，來自家庭水龍頭的可飲用純凈水包含了數(shù)以百萬計(jì)的不同細(xì)菌（每加侖）,，然而科學(xué)家近日開發(fā)了一種新的方法來“操縱”水中的有益細(xì)菌,，使其給飲水者帶來健康效應(yīng)，避免其感染,。這項(xiàng)研究刊登在了ACS旗下的雜志Environment Science & Technology上,。
研究者Lutgarde解釋道，市政污水處理廠盡力去減少過濾器中細(xì)菌的生存的同時,，其也會去除一些顆粒和物質(zhì),，這些東西恰恰是細(xì)菌的營養(yǎng)供給，使得細(xì)菌可以生長。相應(yīng)的措施會增加水中的氯或者消毒劑來殺滅細(xì)菌以阻止其在水管中生長,。盡管如此,，當(dāng)前的技術(shù)并不可能完全小鼠飲用水中的細(xì)菌，因此研究過濾器和其它的水處理設(shè)施如何影響細(xì)菌的類型顯得尤為重要,，這也就是研究者開展此項(xiàng)研究的初衷,。
研究者的研究提供了一些建議，關(guān)于如何終結(jié)飲用水中的細(xì)菌的一些策略,?？茖W(xué)家們發(fā)現(xiàn)特定類型的細(xì)菌吸附于過濾器中，在過濾器中細(xì)菌可以產(chǎn)生生物被膜,，從而使其進(jìn)入飲用水中,，引發(fā)人類的感染。水體的PH值就是指示細(xì)菌進(jìn)入飲用水的一個典型的指標(biāo),，改變水體PH值或者清理過濾器可以有效改變有益和有害細(xì)菌的比率,，從而降低有害細(xì)菌感染人類。（生物谷Bioon.com）
編譯自：Leveraging Bacteria in Drinking Water to Benefit Consumers
doi:10.1021/es302042t
PMC:
PMID:
Bacterial Community Structure in the Drinking Water Microbiome Is Governed by Filtration Processes
Ameet J. Pinto†, Chuanwu Xi‡, and Lutgarde Raskin†*
The bacterial community structure of a drinking water microbiome was characterized over three seasons using 16S rRNA gene based pyrosequencing of samples obtained from source water (a mix of a groundwater and a surface water), different points in a drinking water plant operated to treat this source water, and in the associated drinking water distribution system. Even though the source water was shown to seed the drinking water microbiome, treatment process operations limit the source water’s influence on the distribution system bacterial community. Rather, in this plant, filtration by dual media rapid sand filters played a primary role in shaping the distribution system bacterial community over seasonal time scales as the filters harbored a stable bacterial community that seeded the water treatment processes past filtration. Bacterial taxa that colonized the filter and sloughed off in the filter effluent were able to persist in the distribution system despite disinfection of finished water by chloramination and filter backwashing with chloraminated backwash water. Thus, filter colonization presents a possible ecological survival strategy for bacterial communities in drinking water systems, which presents an opportunity to control the drinking water microbiome by manipulating the filter microbial community. Grouping bacterial taxa based on their association with the filter helped to elucidate relationships between the abundance of bacterial groups and water quality parameters and showed that pH was the strongest regulator of the bacterial community in the sampled drinking water system.
