Hydraulic Response and Nitrogen Retention in Bioretention Mesocosms with Regulated Outlets: Part II—Nitrogen Retention
Hydraulic Response and Nitrogen Retention in Bioretention Mesocosms with Regulated Outlets: Part II—Nitrogen Retention
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DOI：
10.2175/106143011x12989211840936
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发表时间：
2011-08
影响因子：
3.1
通讯作者：
W. Lucas;M. Greenway
中科院分区：
文献类型：
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作者：
W. Lucas;M. Greenway
我们使用具有不同水力传导率的不同介质观察了植被生物滞留中生态系统中溶解氮的滞留。安装高位出口来调节水力响应，其中一种处理方法是自由排水。这些处理（每个重复 3 个）每周加载 50 cm 的污水，平均氮氧化物 (NOx) 为 2.47 mg/L，总氮为 4.67 mg/L，持续 1 年。出口调节处理的氮氧化物和总氮滞留量显着高于未调节处理。然后向系统施用 6 次 53 厘米的合成雨水，平均氮氧化物含量为 0.77 毫克/升，总氮含量为 1.46 毫克/升，施用时间超过 90 分钟。出口调节处理保留了68%的NOx和60%的总氮，而相应的自由排水处理保留了25%的NOx和27%的总氮。在接下来的冬季，出口调节处理保留了 50% 的氮氧化物和 73% 的总氮，而相应的自由排水处理则多出口了 17% 的氮氧化物，同时保留了 50% 的总氮。
We observed dissolved nitrogen retention in vegetated bioretention mesocosms using different media with varying hydraulic conductivities. Elevated outlets were installed to regulate hydraulic response, with one treatment left free draining. The treatments (three replicates each) were loaded weekly with 50 cm of effluent averaging 2.47 mg/L nitrogen oxides (NOx) and 4.67 mg/L total nitrogen for 1 year. The NOx and total nitrogen retention by the outlet regulated treatments was significantly greater than the unregulated treatment. The systems then were dosed 6 times with 53 cm of synthetic stormwater averaging 0.77 mg/L NOx and 1.46 mg/L total nitrogen, applied over 90 minutes. The outlet regulated treatment retained 68% NOx and 60% total nitrogen, while the corresponding free draining treatment retained 25% NOx and 27% total nitrogen. Over the following winter, the outlet regulated treatment retained 50% NOx and 73% total nitrogen, while the corresponding free draining treatment exported 17% more NOx, while retaining 50% total nitrogen.