Nepali Jayasinghe, Dilini Chandima Herath, Lalith Indranath Weerasekara, Sujithra Kaushalya Weragoda, Gayan Darshana Amarasooriya
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引用次数: 0
Abstract
This study was conducted to investigate the effect of different in-house practices on trihalomethane (THM) level fluctuations in pipe-borne water. Common in-house practices such as boiling, unboiling, boiling water with headspace/non-headspace, storage vessels materials, storage practices, and storage time were investigated to study residual THM and their percentage. Vessels made of plastic (P), clay (C), stainless steel (SS), glass (G), and aluminium (Al) were used for the study. Prime trihalomethanes of CHCl3, CHBrCl2, CHBr2Cl, CHBr3, and total of those four THMs (TTHMs) were measured, and removal/formation percentages were calculated. Results revealed that the percent change of TTHM varies based on the boiling practice as follows: open boiling TTHM > close boiling with headspace TTHM > close boiling without headspace (CBWH) TTHM. The following order was observed for residual TTHM for 6 h storage in the vessels; for CBWH water storage in open vessels C < G < P < SS < Al and close vessels C < G < P < SS < Al; and for un-boiled water storage in open vessels SS < C < Al < P < G and close vessels C < P < Al < SS < G. In conclusion, the lowest concentration of residual TTHM was found in the boiled water stored in a clay pot and recommended as an in-house practice to reduce TTHM.
本研究旨在探讨不同的室内操作对管道水中三卤甲烷(THM)水平波动的影响。调查了常见的内部操作,如煮沸、未煮沸、沸水顶空/非顶空、存储容器材料、存储操作和存储时间,以研究残余THM及其百分比。研究中使用了塑料(P)、粘土(C)、不锈钢(SS)、玻璃(G)和铝(Al)制成的容器。测定CHCl3、CHBrCl2、CHBr2Cl、CHBr3及其四种THMs (TTHMs)的质数三卤甲烷,并计算其去除率/成形率。结果表明,不同沸腾方式下,TTHM的百分比变化如下:开煮TTHM >带顶空闭煮TTHM >无顶空(CBWH)闭煮TTHM。剩余TTHM在容器中储存6小时的顺序如下:开放容器C < G < P < SS < Al,封闭容器C < G < P < SS < Al;对于未煮沸的水,开放容器中SS < C < Al < P < G,封闭容器中C < P < Al < SS < G。综上所述,在陶罐中储存的沸水中,TTHM残留浓度最低,建议作为室内实践来减少TTHM。