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The Impact of Rooftop Water Storage Tanks Cleaning and Solar Water Heater on Premise Plumbing Microbiome
drinking water,overnight stagnation,residual chlorine,biofilm,Heterotrophic Plate Count,disinfection by-product,solar water heater,Thermophile,
|Publication Year :||2019|
|Abstract:||台灣淨水程序普遍使用加氯消毒。然而，自來水停留於水塔內過長的時間會使水中的餘氯濃度下降，導致水中微生物的再生長，水塔累積的物質與餘氯反應生成消毒副產物。台灣普遍使用間接供水系統延長自來水在管線的停留時間，本研究分別在台中與台北，各揀選一處間接供水系統進行現地實驗。台北現地系統的研究目的為了解水塔清洗後，隔夜停滯的水塔中水質與微生物組成的變化，結果顯示在清洗前，隔夜停滯的水塔發現餘氯的消耗、總異營菌數增加、總三鹵甲烷濃度的上升，水中微生物組成在停滯後發生改變。水塔清洗減緩隔夜停滯的水塔中餘氯的消耗、總異營數的生長與停滯前後微生物組成的差異。台中現地系統的研究目的為了解通過太陽能熱水器後，隔夜停滯的熱水中水質與微生物組成的變化，隔夜停滯的熱水中發現餘氯劇烈的消耗與總異營菌數增加，熱水中嗜熱菌屬在隔夜停後相對組成比例有所上升，包括Meiothermus、Vulcaniibacterium 與Thermoleophilia _unclassified。停滯前的熱水中則發現Mycobacterium 與Pseudomonas相對組成比例增加。|
Using chlorine as disinfection commonly in water purification in Taiwan. However, the level of residual chlorine decreases when water stagnation in rooftop water storage tank, and it leads to the regrowth of microorganism in drinking water. The accumulated substances in rooftop water storage tank is able to react with residual chlorine to form disinfection by-product (DBP). Indirect water supply which is common to use in Taiwan with extra water storage tank increases hydraulic retention time in premise plumbing. There are two long-running premise plumbing systems with rooftop water storage tank was chosen for analysis, both of the premise plumbing systems in Taipei and Taichung respectively. The objective of analysis in Taipei system was to explores the impact of water stagnation in premise plumbing on water quality and microbiome after storage tank cleaning. Before cleaning, the result show that overnight stagnation resulted in residual chlorine decay, an increase of Trihalomethanes (THMs) and the growth of Heterotrophic plate count (HPC). The bacterial community structure changed during stagnation. The result of cleaning show that residual chlorine decay, growth of HPC and the bacterial community difference was reduced. The objective of analysis in Taichung system was to explores the impact of water stagnation on water quality and microbiome after heating with solar water heater. The result show dramatic chlorine decay and increase HPC during stagnation in solar water heater. The bacterial community changed with an increase relative abundance of Thermophile, including Meiothermus、Vulcaniibacterium and Thermoleophilia _unclassified after overnight stagnation and heating. The relative abundance of Mycobacterium and Pseudomonas increased in effluent from solar water heater before overnight stagnation.
|Appears in Collections:||環境工程學研究所|
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