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Hydraulic and Pollutant Removal Performance of Fine Media Stormwater Filtration Systems

机译：精细介质雨水过滤系统的水力和污染物去除性能

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摘要

Stormwater runoff from urban areas has multiple negative hydrologic and ecological impacts for receiving waters. Fine media stormwater filtration systems have the potential to mitigate these effects, through flow attenuation and pollutant removal. This work provides an overall assessment of the hydraulic and pollutant removal behavior of sand- and soil-based stormwater filters at the laboratory scale. The influence of time, cumulative inflow sediment, cumulative water volume, wetting and drying, and compaction on hydraulic capacity was investigated. The results suggested that the primary cause of hydraulic failure was formation of a clogging layer at the filter surface. Loads of sediment and heavy metals were effectively retained; however, the soil-based fitters leached nitrogen and phosphorus for the duration of the experimental period. Media pollutant profiles revealed significant accumulation of all pollutants in the top 20% of the filter profile, suggesting that elevated discharges of nutrients was due to leaching of native material, rather than failure to remove incoming pollutants. It is recommended that the top 2-5 cm of the filter surface be scraped off every two years to prevent hydraulic failure; this will also avoid excessive accumulation of heavy metals, which may otherwise have been of concern.
机译：城市地区的雨水径流对接收水具有多种负面的水文和生态影响。精细介质雨水过滤系统具有通过减少流量和去除污染物来减轻这些影响的潜力。这项工作在实验室规模上对基于沙子和土壤的雨水过滤器的水力和污染物去除行为进行了全面评估。研究了时间，累积入流沉积物，累积水量，润湿和干燥以及压实对水力能力的影响。结果表明，液压故障的主要原因是在过滤器表面形成堵塞层。有效地保留了沉积物和重金属的负荷；然而，在实验期间，土壤基的钳工浸出了氮和磷。介质污染物分布图表明，所有污染物在过滤器分布图的前20％都有大量积累，这表明养分排放的增加是由于天然物质的浸出而不是无法去除进入的污染物。建议每两年刮掉过滤器表面的顶部2-5厘米，以防止液压故障。这样也可以避免过多的重金属堆积，否则可能会引起关注。

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  • 来源
    《Environmental Science & Technology》 |2008年第7期|p.2535-2541|共7页
  • 作者

    BELINDA E. HATT; TIM D. FLETCHER; ANA DELETIC;

  • 作者单位

    Facility for Advancing Water Biofiltration, Department of Civil Engineering, Monash University, 3800 Victoria, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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