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首页> 外文期刊>Journal of Environmental Science and Health >POU water filters effectively reduce lead in drinking water: a demonstration field study in flint, Michigan
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POU water filters effectively reduce lead in drinking water: a demonstration field study in flint, Michigan

机译：POU滤水器有效减少饮用水中的铅：密歇根州弗林特的一项实地研究

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摘要

A field study was conducted to test the effectiveness of faucet-mounted point of use (POU) water filters for removing high concentrations of lead in drinking water from premise plumbing sources and lead service lines (LSL). These filters were concurrently certified for total lead removal under NSF/ANSI Standard 53 (NSF/ANSI-53) and for fine particulate (Class I) reduction under NSF/ANSI Standard 42 (NSF/ANSI-42). In 2016, filtered and unfiltered drinking water samples were collected at over 345 locations in Flint, Michigan. Over 97% of filtered water samples contained lead below 0.5 mu g/L. The maximum lead concentration in filtered water was 2.9 mu g/L, well below the bottled water standard. The effectiveness of the POU activated carbon block filters in reducing lead concentrations, even above the 150 mu g/L NSF/ANSI-53 challenge standard, is likely related to trapping particles due to the small effective pore size of the filters, in addition to ion-exchange or sorption removal of soluble lead. Properly installed and maintained POU filters, certified under both NSF/ANSI-53 (for total lead) and NSF/ANSI-42 (for fine particulate), can protect all populations, including pregnant women and children, by reducing lead in drinking water to levels that would not result in a significant increase in overall lead exposure.
机译：进行了一项现场研究，以测试水龙头安装式使用点（POU）滤水器去除室内自来水源和铅服务管线（LSL）中饮用水中高浓度铅的有效性。这些过滤器同时获得了NSF / ANSI标准53（NSF / ANSI-53）的总铅去除和NSF / ANSI标准42（NSF / ANSI-42）的细颗粒减少（I类）的认证。 2016年，在密歇根州弗林特市超过345个地点收集了经过过滤和未经过滤的饮用水样品。超过97％的过滤水样品中铅含量低于0.5μg / L。过滤水中的最大铅浓度为2.9μg / L，远低于瓶装水标准。 POU活性炭块式过滤器在降低铅浓度（甚至高于150μg / L NSF / ANSI-53挑战标准）方面的有效性，除了过滤器的有效孔径较小外，还可能与捕集颗粒有关离子交换或吸附去除可溶性铅。正确安装和维护的POU过滤器均通过NSF / ANSI-53（总铅）和NSF / ANSI-42（细颗粒）的认证，可以通过减少饮用水中的铅含量来保护所有人，包括孕妇和儿童。不会导致总铅暴露显着增加的水平。

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