The Role of Denitrification in Stormwater Detention Basin Treatment of Nitrogen.
The Role of Denitrification in Stormwater Detention Basin Treatment of Nitrogen.
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DOI：
10.1021/acs.est.7b01813
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发表时间：
2017-07
影响因子：
11.4
通讯作者：
Natalie R. Morse;L. McPhillips;James P. Shapleigh;M. Todd Walter
中科院分区：
文献类型：
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作者：
Natalie R. Morse;L. McPhillips;James P. Shapleigh;M. Todd Walter
氮（N）循环动力学的四个雨水流域，两个经常饱和的网站（“湿盆”）和两个快速排水网站（“干盆”），进行了监测，在2001年的时间。本研究将雨水和温室气体监测与微生物分析相结合，以阐明控制氮处理的机制。年溶解无机氮（DIN）的质量减少（流入减去流出）在干盆地比在湿盆地，2.16与0.75克N米-2年-1，分别。干盆地渗透了大量的水，因此具有更大的DIN质量减少，即使传入和传出DIN浓度在统计上是相同的两个网站。湿地具有较高的反硝化基因比例和潜在的反硝化速率。湿盆能够净化58%的输入DIN，而干盆仅净化1%。这些结果强调需要更多的机械注意流域设计，因为通过比较流入和流出负荷计算的减少可能不相关的流域尺度。反硝化是从陆地环境和接收水体中完全去除DIN的唯一途径。因此，在流域尺度上，湿盆地可能具有更好的整体DIN处理。
The nitrogen (N) cycling dynamics of four stormwater basins, two often saturated sites ("Wet Basins") and two quick draining sites ("Dry Basins"), were monitored over a ∼ 1-year period. This study paired stormwater and greenhouse gas monitoring with microbial analyses to elucidate the mechanisms controlling N treatment. Annual dissolved inorganic N (DIN) mass reductions (inflow minus outflow) were greater in the Dry Basin than in the Wet Basin, 2.16 vs 0.75 g N m-2 yr-1, respectively. The Dry Basin infiltrated a much larger volume of water and thus had greater DIN mass reductions, even though incoming and outgoing DIN concentrations were statistically the same for both sites. Wet Basins had higher proportions of denitrification genes and potential denitrification rates. The Wet Basin was capable of denitrifying 58% of incoming DIN, whereas the Dry Basin only denitrified 1%. These results emphasize the need for more mechanistic attention to basin design because the reductions calculated by comparing inflow and outflow loads may not be relevant at watershed scales. Denitrification is the only way to fully remove DIN from the terrestrial environment and receiving waterbodies. Consequently, at the watershed scale the Wet Basin may have better overall DIN treatment.