Denitrifying bioreactors and dissolved phosphorus: Net source or sink?

IF 2.2 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Journal of environmental quality Pub Date : 2024-05-06 DOI:10.1002/jeq2.20568
A P Sanchez-Bustamante Bailon, A Margenot, R A C Cooke, L E Christianson
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Abstract

Understanding the world through a lens of phosphorus (P), as Dr. Andrew Sharpley aimed to do, adds a deeper dimension for water quality work in the heavily tile-drained US Midwest where nitrate is often the nutrient of biggest concern. Denitrifying woodchip bioreactors reduce nitrate pollution in drainage water, but dissolved phosphorus leached from the organic fill is a possible pollution tradeoff. Recent work by Dr. Sharpley and others defined such tradeoffs as strategic decisions in which a negative outcome is accepted with prior knowledge of the risk. In this vein, we assessed 23 site-years from full-size bioreactors in Illinois to determine if bioreactors were a net dissolved reactive phosphorus (DRP) source and, if so, to determine flow-related correlation agents (1904 sample events; 10 bioreactors). DRP was removed across the bioreactors in 15 of 23 site-years. The 23 site-years provided a median annual DRP removal efficiency of 12% and a median annual DRP removal rate of 7.1 mg DRP/m3 bioreactor per day, but the ranges of all removal metrics overlapped zero. The highest daily bioreactor DRP removal rates occurred with high inflow concentrations and under low hydraulic retention times (i.e., under higher loading). Dr. Sharpley was one of the first to explore losses of DRP in subsurface drainage and performed decades of useful applied studies that inspired approaches to management of P loss on both drained and undrained land. We seek to honor this legacy with this practical study of the DRP benefits and tradeoffs of denitrifying bioreactors.

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反硝化生物反应器和溶解磷:净源还是净汇?
安德鲁-夏普利博士(Dr. Andrew Sharpley)希望通过磷(P)的视角来了解世界,这为美国中西部排水量大的地区的水质工作增添了更深层次的意义,因为硝酸盐通常是最令人担忧的营养物质。反硝化木屑生物反应器可减少排水中的硝酸盐污染,但从有机填料中沥滤出的溶解磷可能会造成污染。Sharpley 博士等人最近的研究将这种权衡定义为在事先了解风险的情况下接受负面结果的战略决策。因此,我们对伊利诺斯州全尺寸生物反应器的 23 个现场年进行了评估,以确定生物反应器是否是溶解性活性磷 (DRP) 的净来源,如果是,则确定与流量相关的相关因子(1904 个样本事件;10 个生物反应器)。在 23 个现场年中,有 15 个生物反应器去除了 DRP。这 23 个现场年的 DRP 去除效率中位数为 12%,DRP 去除率中位数为每天 7.1 毫克 DRP/m3 生物反应器,但所有去除指标的范围均为零。最高的生物反应器 DRP 日去除率出现在高流入浓度和低水力停留时间(即较高负载)的情况下。Sharpley 博士是最早探索地下排水中 DRP 损失的学者之一,他进行了数十年有用的应用研究,为排水和未排水土地的 P 损失管理方法提供了灵感。我们希望通过对反硝化生物反应器的 DRP 效益和权衡的实用研究来缅怀他的丰功伟绩。
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来源期刊
Journal of environmental quality
Journal of environmental quality 环境科学-环境科学
CiteScore
4.90
自引率
8.30%
发文量
123
审稿时长
3 months
期刊介绍: Articles in JEQ cover various aspects of anthropogenic impacts on the environment, including agricultural, terrestrial, atmospheric, and aquatic systems, with emphasis on the understanding of underlying processes. To be acceptable for consideration in JEQ, a manuscript must make a significant contribution to the advancement of knowledge or toward a better understanding of existing concepts. The study should define principles of broad applicability, be related to problems over a sizable geographic area, or be of potential interest to a representative number of scientists. Emphasis is given to the understanding of underlying processes rather than to monitoring. Contributions are accepted from all disciplines for consideration by the editorial board. Manuscripts may be volunteered, invited, or coordinated as a special section or symposium.
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