Davis Allen P, Shokouhian Mohammad, Sharma Himanshu, Minami Christie
Department of Civil and Environmental Engineering, Maryland Water Resources Research Center, University of Maryland, College Park 20742, USA.
Water Environ Res. 2006 Mar;78(3):284-93. doi: 10.2175/106143005x94376.
High nutrient inputs and eutrophication continue to be one of the highest priority water quality problems. Bioretention is a low-impact development technology that has been advocated for use in urban and other developed areas. This work provides an in-depth analysis on removal of nutrients from a synthetic stormwater runoff by bioretention. Results have indicated good removal of phosphorus (70 to 85%) and total Kjeldahl nitrogen (55 to 65%). Nitrate reduction was poor (< 20%) and, in several cases, nitrate production was noted. Variations in flowrate (intensity) and duration had a moderate affect on nutrient removal. Mass balances demonstrate the importance of water attenuation in the facility in reducing mass nutrient loads. Captured nitrogen can be converted to nitrate between storm events and subsequently washed from the system. Analysis on the fate of nutrients in bioretention suggests that accumulation of phosphorus and nitrogen may be controlled by carefully managing growing and harvesting of vegetation.
高养分输入和富营养化仍然是最需优先解决的水质问题之一。生物滞留是一种低影响开发技术，已被提倡用于城市和其他发达地区。这项工作对生物滞留去除合成雨水径流中的养分进行了深入分析。结果表明对磷（70%至85%）和凯氏氮总量（55%至65%）有良好的去除效果。硝酸盐还原效果不佳（<20%），并且在一些情况下还出现了硝酸盐生成现象。流量（强度）和持续时间的变化对养分去除有中等程度的影响。质量平衡表明该设施中的水衰减对于减少养分负荷总量具有重要意义。捕获的氮在暴雨事件之间可转化为硝酸盐，随后被冲出系统。对生物滞留中养分归宿的分析表明，通过谨慎管理植被的生长和收割，可以控制磷和氮的积累。
