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首页> 外文期刊>Applied and Environmental Microbiology >Escherichia coli Behavior in the Presence of Organic Matter Released by Algae Exposed to Water Treatment Chemicals
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Escherichia coli Behavior in the Presence of Organic Matter Released by Algae Exposed to Water Treatment Chemicals

机译：暴露于水处理化学品的藻类释放的有机物存在下的大肠杆菌行为

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When exposed to oxidation, algae release dissolved organic matter with significant carbohydrate (52%) and biodegradable (55 to 74%) fractions. This study examined whether algal organic matter (AOM) added in drinking water can compromise water biological stability by supporting bacterial survival. Escherichia coli (1.3 × 105 cells ml?1) was inoculated in sterile dechlorinated tap water supplemented with various qualities of organic substrate, such as the organic matter coming from chlorinated algae, ozonated algae, and acetate (model molecule) to add 0.2 ± 0.1 mg of biodegradable dissolved organic carbon (BDOC) liter?1. Despite equivalent levels of BDOC, E. coli behavior depended on the source of the added organic matter. The addition of AOM from chlorinated algae led to an E. coli growth equivalent to that in nonsupplemented tap water; the addition of AOM from ozonated algae allowed a 4- to 12-fold increase in E. coli proliferation compared to nonsupplemented tap water. Under our experimental conditions, 0.1 mg of algal BDOC was sufficient to support E. coli growth, whereas the 0.7 mg of BDOC liter?1 initially present in drinking water and an additional 0.2 mg of BDOC acetate liter?1 were not sufficient. Better maintenance of E. coli cultivability was also observed when AOM was added; cultivability was even increased after addition of AOM from ozonated algae. AOM, likely to be present in treatment plants during algal blooms, and thus potentially in the treated water may compromise water biological stability.
机译：当暴露于氧化作用时，藻类会释放溶解的有机物，其中含有大量碳水化合物（52％）和可生物降解的部分（55％至74％）。这项研究检查了饮用水中添加的藻类有机物（AOM）是否可以通过支持细菌存活而损害水的生物稳定性。将大肠杆菌（1.3×105细胞ml？1）接种在无菌的脱氯自来水中，并补充各种质量的有机底物，例如来自氯化藻，臭氧化藻和醋酸盐的有机物（模型分子），以添加0.2±0.1毫克可生物降解的溶解有机碳（BDOC）升1。尽管BDOC的水平相等，但大肠杆菌的行为取决于所添加有机物的来源。从氯化藻中添加AOM导致大肠杆菌的生长与未补充自来水中的大肠杆菌相等。与未补充自来水相比，从臭氧化藻类中添加AOM可使大肠杆菌的增殖增加4至12倍。在我们的实验条件下，0.1 mg藻类BDOC足以支持大肠杆菌的生长，而最初存在于饮用水中的0.7 mg BDOC升？1和另外0.2 mg BDOC乙酸升？1不足。添加AOM时，还可以更好地保持大肠杆菌的可培养性。从臭氧化藻类添加AOM后，可耕性甚至提高。 AOM可能在藻华期间出现在处理厂中，因此可能存在于处理后的水中，可能会损害水的生物稳定性。

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