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首页> 外文期刊>Ground Water Monitoring & Remediation >Monitoring the Removal of Phosphate from Ground Water Discharging through a Pond-Bottom Permeable Reactive Barrier
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Monitoring the Removal of Phosphate from Ground Water Discharging through a Pond-Bottom Permeable Reactive Barrier

机译：监视通过池底渗透性反应性屏障从地下水排放中去除磷酸盐

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Installation of a permeable reactive barrier to intercept a phosphate (PO_4) plume where it discharges to a pond provided an opportunity to develop and test methods for monitoring the barrier's performance in the shallow pond-bottom sediments. The barrier is composed of zero-valent-iron mixed with the native sediments to a 0.6-m depth over a 1100-m~2 area. Permanent suction, diffusion, and seepage samplers were installed to monitor PO_4 and other chemical species along vertical transects through the barrier and horizontal transects below and near the top of the barrier. Analysis of pore water sampled at about 3-cm vertical intervals by using multilevel diffusion and suction samplers indicated steep decreases in PO_4 concentrations in ground water flowing upward through the barrier. Samples from vertically aligned pairs of horizontal multiport suction samplers also indicated substantial decreases in PO_4 concentrations and lateral shifts in the plume's discharge area as a result of varying pond stage. Measurements from Lee-style seepage meters indicated substantially decreased PO_4 concentrations in discharging ground water in the treated area; temporal trends in water flux were related to pond stage. The advantages and limitations of each sampling device are described. Preliminary analysis of the first 2 years of data indicatas that the barrier reduced PO_4 flux by as much as 95%.
机译：安装可渗透的反应性屏障以拦截磷酸盐（PO_4）羽流排放到池塘的现象，为开发和测试监测屏障在浅池底部沉积物中的性能提供了机会。屏障由零价铁与天然沉积物混合而成，在1100 m〜2的区域中深度为0.6 m。安装了永久性的抽吸，扩散和渗漏采样器，以监视PO_4和其他化学物质沿穿过屏障的垂直样条以及屏障下方和顶部附近的水平样条。通过使用多级扩散和抽吸采样器对垂直方向间隔约为3厘米的孔隙水进行分析，结果表明向上流过屏障的地下水中PO_4浓度急剧下降。垂直对齐的水平多端口吸力采样器对中的样品还表明，由于池塘水位的变化，PO_4浓度显着下降，羽流排放区域的横向偏移也很大。 Lee型渗漏仪的测量结果表明，处理区的地下水排放中PO_4浓度大大降低；水通量的时间趋势与池塘阶段有关。描述了每个采样设备的优点和局限性。对前两年的数据指标进行的初步分析表明，该屏障将PO_4通量降低了多达95％。

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