SUNJian-wei.Effects of the Combined Ultraviolet and Chloramine Disinfection on Microbial Growth in a Full-scale Water Supply System[J].China Water & Wastewater,2022,38(9):39-43.
紫外/氯胺消毒对供水系统中微生物数量分布的影响
- Title:
- Effects of the Combined Ultraviolet and Chloramine Disinfection on Microbial Growth in a Full-scale Water Supply System
- Keywords:
- drinking water; combined ultraviolet and chloramine disinfection; water supply system; microbial growth
- 摘要:
- 针对上海临江水厂紫外/氯胺组合消毒供水系统，研究了紫外关闭前后，紫外/氯胺组合消毒和单氯胺消毒对供水系统中微生物数量分布的影响。结果表明：紫外/氯胺组合消毒对出厂水微生物的消毒效率比氯胺消毒更高。目前工艺条件下，组合消毒可做到对可培养细菌的100%灭活，单氯胺消毒只能达到97.71%～99.98%。单氯胺消毒下，管网异养菌平板计数均值相对紫外/氯胺组合消毒增加128.78%，二次供水异养菌平板计数均值相对增加8.94%，紫外/氯胺组合消毒相对单氯胺消毒可改善管网微生物生长水平，但不能改变管网微生物生长变化规律。二次供水的微生物水平仍明显高于供水管网。二次供水模式中，直供水模式的水质相对最好，水池+水箱供水模式的水质相对最差。相同供水模式下，组合消毒比单氯胺消毒对二次供水微生物的控制效果更好。
- Abstract:
- Linjiang Waterworks of Shanghai and its water supply system were targeted to investigate the influence of the combined UV/chloramine disinfection and chloramine disinfection on the quantity distribution of microorganisms. The results showed that the efficiency of the combined UV/chloramine disinfection was higher than that of the single chloramine disinfection. Under the current process conditions, the combined UV/chloramine disinfection could inactivate all culturable bacteria. However, chloramine disinfection could not inactivate all culturable bacteria (97.71%-99.98%). The average HPC in the chloramine disinfection pipe system increased 128.78% more than that in the combined UV/chloramine disinfection. It increased 8.94% in the secondary water supply system. Compared with the chloramine disinfection, the combined UV/chloramine disinfection could reduce the microbial growth level in pipe network to a certain extent, but could not change the law of microbial growth in pipe network. The microbial level in the secondary water supply system was still significantly higher than that in the main pipes. In the secondary water supply modes, the direct water supply mode had the best water quality, and the pool-tank water supply mode had the worst water quality. Under the same water supply mode, the combined disinfection in waterworks had better control effect on microorganisms in secondary water supply than the chloramine disinfection.
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