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Nitrogen Retention in Bioretention Mesocosms with Outlet Controls

机译：具有出口控制的生物滞留介体中的氮保留

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Retention of nitrogen (N) in bioretention systems is often less effective than observed for other pollutants. To examine factors that improve N retention, bioretention mesocosms 240L in size were used to retain dissolved nitrogen by bioretention systems, using different media amendments with varying hydraulic responses.Notwithstanding high hydraulic loads, cumulative retention of total nitrogen (TN) and nitrogen oxides (NO_x) was as high as 48%. In contrast to vegetated systems, TN retention by barren media was only 3%. TN retention in all vegetated systems substantially exceeded projected plant N uptake, suggesting that denitrification also contributes to TN removal in bioretention systems. The 63% NO_x retention observed in the outlet controlled treatment was significantly better than the 45% retention observed in the corresponding unrestricted treatment.During high concentration stormwater runs, TN retention ranged from 27% to 64%, and NO_x retention ranged from 19% to78%, with the unrestricted treatment being the least effective. During the low concentration stormwater runs, TN retention ranged from 2% to 50%, while NO_x retention ranged from 28% to76%. Again, the unrestricted treatment was the least effective. NO_x retention in the non-restricted treatment was significantly lower than the corresponding controlled treatment in every case, and in two of three cases for TN. These results document the importance of a saturated zone and extended retention time on improving N retention, even under high hydraulic loading rates.
机译：生物保留系统中氮（N）的保留效果通常不如其他污染物有效。为了研究改善氮保留的因素，使用大小为240L的生物保留介体通过生物保留系统保留溶解的氮，使用具有不同水力响应的不同培养基改良剂。 尽管液压负荷很高，但总氮（TN）和氮氧化物（NO_x）的累积保留率高达48％。与植被系统相比，贫瘠介质对TN的保留率仅为3％。所有植被系统中的总氮保留量都大大超过了预计的植物氮吸收量，这表明反硝化作用也有助于生物保留系统中总氮的去除。在出口控制的处理中观察到的63％的NO_x保留率明显好于在相应的非限制性处理中观察到的45％的保留率。 在高浓度雨水运行期间，总氮保留量为27％至64％，NO_x保留量为19％至78％，其中无限制的处理效果最低。在低浓度雨水运行期间，总氮保留量为2％至50％，而NO_x保留量为28％至76％。同样，无限制的治疗效果最低。在每种情况下，以及在三分之二的TN中，非限制性治疗中的NO_x保留率均显着低于相应的对照治疗。这些结果证明了饱和区和延长保留时间对改善氮保留的重要性，即使在高水力加载速率下也是如此。

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