Enhanced disinfection byproducts formation by fine iron particles intercepted in household point-of-use facilities.
Enhanced disinfection byproducts formation by fine iron particles intercepted in household point-of-use facilities.
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DOI：
10.1016/j.watres.2023.120320
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发表时间：
2023-07
期刊：
影响因子：
12.8
通讯作者：
Yujia Gao;Y. Zhuang;Shuxuan Wu;Zhenguo Qi;Penglu Li;Baoyou Shi
中科院分区：
文献类型：
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作者：
Yujia Gao;Y. Zhuang;Shuxuan Wu;Zhenguo Qi;Penglu Li;Baoyou Shi
为了科普对优质饮用水的需求，广泛使用聚丙烯棉过滤器（PCF）等家庭使用点（POU）设施。然而，新的和使用过的PCF在变色下的行为尚不清楚。在这项研究中，我们发现，新的PCF没有有效地拦截下变色的颗粒在最初的5天内流入。此外，长期使用的PCF中积累的颗粒，特别是细小颗粒，加剧了消毒副产物（DBPs）和微生物的风险。三卤甲烷（THMs）和卤代乙腈（HAN）的浓度在流出物中运行通过PCF都随着时间的推移而增加，有趣的是，所有急剧增加5天后，根据流出物铁颗粒的减少。在此阶段，THMs和HAN的最大增长率分别为117.89%和75.12%。对于卤代乙酸（哈斯），它是主要污染物，浓度约为THMs和HAN的10倍。这一增加表明，使用过的多氯联苯可能会加剧接触消毒副产物的风险。三磷酸腺苷（ATP）也显示出类似的趋势，最大值从0.0033增加到0.0055 nmol/mL。因此，PCF只能作为预处理单元，并应在黄水事件后更换。该研究为PCF在饮用水净化中的应用提供了重要指导，特别是在变色情况下。
To cope with the demand for good-quality potable water, household point-of-use (POU) facilities such as polypropylene cotton filters (PCFs) are widely used. However, the behaviors of new and used PCFs under discoloration are unclear. In this study, we found that new PCF did not effectively intercept particles under discoloration within the initial 5 d of inflow. In addition, the particles, especially the fine ones, accumulated in the long-used PCF exacerbated the risks of disinfection byproducts (DBPs) and microbes. The concentrations of trihalomethanes (THMs) and haloacetonitriles (HANs) in the effluent run through the PCF all increased over time; interestingly, all sharply increased after 5 d in accordance with the decrease in effluent iron particles. During this stage, maximum increases rate of 117.89% in THMs and 75.12% in HANs were observed. For haloacetic acids (HAAs), it served as the dominant contaminants, with concentrations approximately 10-fold greater than those of THMs and HANs. The increase showed that used PCFs could exacerbate the risks in DBPs exposure. Adenosine triphosphate (ATP) also showed a similar trend, with a maximum increase from 0.0033 to 0.0055 nmol/mL. Thus, PCFs can act only as pretreatment units and should be replaced after yellow water events. This study offers important guidance for PCF usage in drinking water purification, especially under discoloration.