Synder J W, Mains C N, Anderson R E, Bissonnette G K
Division of Plant and Soil Sciences, West Virginia University, Morgantown 26506-6057, USA.
Appl Environ Microbiol. 1995 Dec;61(12):4291-5. doi: 10.1128/aem.61.12.4291-4295.1995.
The water quality of 24 rural, domestic groundwater supplies treated with point-of-use, powdered activated carbon (PAC) filters was monitored to determine how such treatment might impact the bacteriological quality of private, residential drinking water supplies. Heterotrophic-plate-count (HPC) and total coliform analyses were performed on raw, PAC-treated, and overnight or stagnant (first-draw) PAC-treated water samples. Densities of HPC bacteria were elevated by 0.86 and 0.20 orders of magnitude for spring and well water systems, respectively, in PAC-treated effluents following overnight stagnation compared with levels in untreated treated effluents. Densities of HPC bacteria in PAC-treated effluents were significantly reduced (P < 0.01) below influent levels, however, after the point-of-use device was flushed for 2 min. While PAC significantly reduced the number of coliforms in product waters (P < 0.01), these indicator organisms were still detected in some effluents. Seasonal variations were evident in microbial counts from spring but not well water systems. It appears that aside from periods following stagnant-water use, such as overnight, PAC treatment does not compromise the bacteriological quality of drinking water obtained from underground sources.
对24个使用家庭用粉末活性炭（PAC）过滤器处理的农村生活地下水供应点的水质进行了监测，以确定这种处理方式可能如何影响私人住宅饮用水供应的细菌学质量。对原水、经PAC处理的水以及过夜或停滞（首次抽取）的经PAC处理的水样进行了异养平板计数（HPC）和总大肠菌群分析。与未处理的废水相比，过夜停滞的PAC处理废水中，春季和井水系统的HPC细菌密度分别提高了0.86和0.20个数量级。然而，在使用点设备冲洗2分钟后，PAC处理废水中的HPC细菌密度显著降低（P<0.01）至进水水平以下。虽然PAC显著减少了产水中的大肠菌群数量（P<0.01），但在一些废水中仍检测到这些指示生物。春季微生物计数存在明显的季节性变化，而井水系统则没有。看来，除了使用过夜等停滞水后的时间段外，PAC处理不会损害从地下水源获得的饮用水的细菌学质量。
