Investigation of assimilable organic carbon (AOC) and bacterial regrowth in drinking water distribution system
Investigation of assimilable organic carbon (AOC) and bacterial regrowth in drinking water distribution system
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DOI：
10.1016/s0043-1354(01)00296-2
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发表时间：
2002-02-01
期刊：
影响因子：
12.8
通讯作者：
Ng, WJ
中科院分区：
文献类型：
--
作者：
Liu, W;Wu, H;Ng, WJ
以我国北方某城市为研究对象，研究了几个典型水厂和配水系统中可同化有机碳（AOC）浓度的变化规律。研究结果表明：（1）大部分水厂的出水和配水系统的出水AOC不能满足50-100 mug/L的生物稳定性标准; (2)只有4%的AOC浓度低于100 mug/L。然而，大约一半的测量AOC值小于200 mug/L。(3)较好的水源水质导致较低的AOC浓度。(4)配水系统中AOC浓度的变化受氯氧化和细菌活性的影响，前者导致AOC值的增加，后者导致AOC值的降低。(5)不同的配水系统或不同的季节，由于各自的运行特点，AOC浓度的变化规律也不同。(6)常规处理工艺对AOC的去除率低于30%，而颗粒活性炭（GAC）处理工艺对AOC的去除率为30-60%，最高可达50-60%。(7)通过扫描电镜（SEM）对配水管瘤样进行观察，发现配水管内壁不光滑，细菌在配水管瘤样缝隙及内壁大量繁殖。(C)2002爱思唯尔科技有限公司版权所有。
This paper investigated the variation of assimilable organic carbon (AOC) concentrations in water from several typical water treatment plants and distribution systems in a northern city of China. It is concluded from this study that: (1) The AOC in most of the product water of the studied water treatment plants and the water from the associated distribution systems could not meet the biostability criteria of 50-100 mug/L. (2) Only 4% of the measured AOC concentrations were less than 100 mug/L. However, about half of the measured AOC values were less than 200 mug/L. (3) Better source water quality resulted in lower AOC concentrations. (4) The variation of AOC concentrations in distribution systems was affected by chlorine oxidation and bacterial activity: the former resulted in an increase of AOC value while the latter led to a reduction in AOC. (5) The variation of AOC concentration followed different patterns in different distribution systems or different seasons due to their respective operational characteristics. (6) Less than 30% of AOC could be removed by a conventional treatment process, whereas 30-60% with a maximum of 50-60% could be removed by granular activated carbon (GAC). (7) The observation via scanning electron microscope (SEM) on distribution pipe tubercle samples demonstrated that the pipe inner wall was not smooth and bacteria multiplied in the crevice as well as in the interior wall of distribution pipes. (C) 2002 Elsevier Science Ltd. All rights reserved.