Microbially available organic carbon, phosphorus, and microbial growth in ozonated drinking water

被引:76
作者
Lehtola, MJ
Miettinen, IT
Vartiainen, T
Myllykangas, T
Martikainen, PJ
机构
[1] Natl Publ Hlth Inst, Lab Environm Microbiol, FIN-70701 Kuopio, Finland
[2] Natl Publ Hlth Inst, Chem Lab, FIN-70701 Kuopio, Finland
[3] Univ Kuopio, Dept Environm Sci, FIN-70211 Kuopio, Finland
关键词
drinking water; microbially available phosphorus; microbial growth; ozonation; water treatment;
D O I
10.1016/S0043-1354(00)00449-8
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Ozonation is a disinfection technique commonly used in the treatment of drinking water. It destroys harmful microbes. but it also degrades organic matter in water, increasing the bioavailability of organic matter. Recently. it was found that not only organic carbon bur also phosphorus can limit the microbial growth in drinking water, which contains high amount of organic matter. We used a bioassay to analyze whether ozone could also increase the microbially available phosphorus (MAP) in drinking water, and whether MAP in ozone-treated water was associated with the growth of heterotrophic microbes. We found that both assimilable organic carbon and MAP concentrations were increased by ozone treatment. In ozonated water, microbial growth was mainly limited by phosphorus. and even minor changes in MAP concentration dramatically increased the growth potential of heterotrophic microbes. In this study, ozonation increased the MAP by 0.08-0.73 mug P/l, resulting in an increase of 80,000-730,000 CFU/ml in water samples, In contrast to MAP. the content of assimilable organic carbon (AOC(potential)) did not correlate with microbial growth. The results show that in water treatment not only AOC(potential) but also MAP should be considered as an important factor that can limit microbial growth in drinking water. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1635 / 1640
页数:6
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