Inactivation of faecal indicator microorganisms in waste stabilisation ponds: Interactions of environmental factors with sunlight
Inactivation of faecal indicator microorganisms in waste stabilisation ponds: Interactions of environmental factors with sunlight
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DOI：
10.1016/s0043-1354(98)00321-2
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发表时间：
1999-04-01
期刊：
影响因子：
12.8
通讯作者：
Nagels, JW
中科院分区：
文献类型：
--
作者：
Davies-Colley, RJ;Donnison, AM;Nagels, JW
阳光照射被认为是废物稳定池（WSP）中“自然”消毒的最重要原因。我们研究了溶解氧（DO），pH值，和颗粒和溶解成分在WSP污水，阳光灭活粪便微生物的影响，使用小反应器在受控的物理化学条件下运行。肠球菌和F-DNA的灭活强烈增加DO的增加，也依赖于光吸收pondwater成分，但pH值是没有影响的范围内调查（7.5至10）。灭活E.大肠杆菌在pH值高于8.5时，其活性显著增加，并且对DO有很强的依赖性。F-DNA噬菌体的灭活与所研究的因素无关。这些结果是一致的F-DNA指示剂被灭活的直接DNA损伤的结果，UVB在阳光下，而其他三个微生物指示剂被灭活的结果，光氧化损伤，虽然损伤的目标是明显不同的。我们的研究结果的不同影响的物理化学条件表明，在解释数据的困难，为一个单一的微生物，以表明水处理厂的污水质量。然而，阳光仍然是最重要的因素，WSP中的消毒可以通过增加阳光照射来增强。(C)1999 Elsevier Science Ltd.保留所有权利。
Sunlight exposure is considered to be the most important cause of "natural" disinfection in waste stabilisation ponds (WSPs). We examined the influence of dissolved oxygen (DO), pH, and particulate and dissolved constituents in WSP effluent, on sunlight inactivation of faecal micro-organisms, using small reactors operated under controlled physico-chemical conditions. Inactivation of both enterococci and F-DNA phages increased strongly as DO was increased, and also depended on light-absorbing pondwater constituents, but pH was not influential over the range investigated (7.5 to 10). Inactivation of E. coli increased strongly when pH increased above 8.5, as well as being strongly dependent on DO. Inactivation of F-DNA phage was independent of the factors investigated. These results are consistent with the F-DNA phages being inactivated as a result of direct DNA damage by UVB in sunlight, whereas the other three microbiological indicators are inactivated as a result of photo-oxidative damage, although the target of damage is apparently different. Our findings of diverse influences of physico-chemical conditions suggest difficulties in interpreting data for a single micro-organism to indicate WSP effluent quality. However, sunlight remains the factor of over-riding importance, and disinfection in WSPs may be enhanced by increasing sunlight exposure. (C) 1999 Elsevier Science Ltd. All rights reserved.