Feasibility of Using Woodchip Bioreactors to Treat Legacy Nitrogen to Meet Chesapeake Bay Water Quality Goals.
Feasibility of Using Woodchip Bioreactors to Treat Legacy Nitrogen to Meet Chesapeake Bay Water Quality Goals.
复制标题
使用木片生物反应器处理残余氮以满足切萨皮克湾水质目标的可行性。
DOI：
10.1021/acs.est.9b04919
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发表时间：
2019
影响因子：
11.4
通讯作者：
K. Stephenson
中科院分区：
文献类型：
--
作者：
Z. Easton;E. Bock;K. Stephenson
美国环境保护署已经制定了积极的营养减少目标，以实现切萨皮克湾河口的水质目标。到2025年，每年还需要额外减少2040万公斤氮，因此氮减排目标被证明特别难以实现，许多容易实现和低成本的氮减排已经实现。我们评估的可行性，采用木屑净化生物反应器来处理遗产N来自春季排放在大西洋中部地区。我们估计，在超过6100公斤的可溶性氮是每天从美国地质调查局确定在四个大西洋中部国家的切萨皮克湾流域内的春天。基于典型的生物反应器去除效率（30-55%）和潜在的可处理流量（<6000 m3/d），广泛采用生物反应器处理来自231个泉水的遗留氮，保守地说，每天可去除420-770 kg氮，而针对48个泉水的战略采用，其氮浓度至少为3 mg/L，流量至少为500 m3/d，可能会导致322-每天去除590公斤氮，更具成本效益，安装数量少得多。成本分析表明，生物反应器可以是一种具有成本效益的脱氮策略，通常去除氮的成本低于5美元/kg·y。相对于其他非点源污染控制实践，生物反应器还提供了每个装置去除大量N的能力，并且更容易监测以量化N减少。
The United States Environmental Protection Agency has established aggressive nutrient reduction goals to achieve water quality objectives for the Chesapeake Bay estuary. Nitrogen (N) reduction goals are proving particularly difficult to meet with an additional 20.4 million kg of annual nitrogen reductions needed by 2025, and many of the easily achievable and low-cost N reductions have been realized. We assess the feasibility of employing woodchip denitrifying bioreactors to treat legacy N derived from spring discharge in the Mid-Atlantic region. We estimate that in excess of 6100 kg of soluble N is discharged daily from United States Geological Survey identified springs in four Mid-Atlantic states within the Chesapeake Bay watershed. Based on typical bioreactor removal efficiency (30-55%) and potentially treatable flows (<6000 m3/d), widespread adoption of bioreactors to treat legacy N from 231 springs could conservatively result in 420-770 kg N removed per day, while strategic adoption targeting 48 springs with N concentrations of at least 3 mg/L and flows of at least 500 m3/d could result in 322-590 kg N removed per day more cost-effectively and with far fewer installations. A cost analysis indicates bioreactors can be a cost-effective N removal strategy, generally removing N for less than $5/kg·y. Relative to other nonpoint source pollution control practices, bioreactors also offer the ability to remove larger quantities of N per installation and are more easily monitored to quantify N reductions.