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Effectiveness of Denitrifying Bioreactors on Water Pollutant Reduction from Agricultural Areas

Christianson, L. E., Cooke, R. A., Hay, C. H., Helmers, M. J., Feyereisen, G. W., Ranaivoson, A. Z., McMaine, J. T., McDaniel, R., Rosen, T. R., Pluer, W. T., Schipper, L. A., Dougherty, H., Robinson, R. J., Layden, I. A., Irvine-Brown, S. M., Manca, F., Dhaese, K., Nelissen, V. and von Ahnen, M. (2021) Effectiveness of Denitrifying Bioreactors on Water Pollutant Reduction from Agricultural Areas. Transactions of the ASABE, 64 (2). pp. 641-658. ISSN 2151-0032

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Article Link(s): https://doi.org/10.13031/trans.14011

Publisher URL: https://elibrary.asabe.org/abstract.asp?aid=52168&t=3

Abstract

HighlightsDenitrifying woodchip bioreactors treat nitrate-N in a variety of applications and geographies.This review focuses on subsurface drainage bioreactors and bed-style designs (including in-ditch).Monitoring and reporting recommendations are provided to advance bioreactor science and engineering. Denitrifying bioreactors enhance the natural process of denitrification in a practical way to treat nitrate-nitrogen (N) in a variety of N-laden water matrices. The design and construction of bioreactors for treatment of subsurface drainage in the U.S. is guided by USDA-NRCS Conservation Practice Standard 605. This review consolidates the state of the science for denitrifying bioreactors using case studies from across the globe with an emphasis on full-size bioreactor nitrate-N removal and cost-effectiveness. The focus is on bed-style bioreactors (including in-ditch modifications), although there is mention of denitrifying walls, which broaden the applicability of bioreactor technology in some areas. Subsurface drainage denitrifying bioreactors have been assessed as removing 20% to 40% of annual nitrate-N loss in the Midwest, and an evaluation across the peer-reviewed literature published over the past three years showed that bioreactors around the world have been generally consistent with that (N load reduction median: 46%; mean ±SD: 40% ±26%; n = 15). Reported N removal rates were on the order of 5.1 g N m-3 d-1 (median; mean ±SD: 7.2 ±9.6 g N m-3 d-1; n = 27). Subsurface drainage bioreactor installation costs have ranged from less than $5,000 to $27,000, with estimated cost efficiencies ranging from less than $2.50 kg-1 N year-1 to roughly $20 kg-1 N year-1 (although they can be as high as $48 kg-1 N year-1). A suggested monitoring setup is described primarily for the context of conservation practitioners and watershed groups for assessing annual nitrate-N load removal performance of subsurface drainage denitrifying bioreactors. Recommended minimum reporting measures for assessing and comparing annual N removal performance include: bioreactor dimensions and installation date; fill media size, porosity, and type; nitrate-N concentrations and water temperatures; bioreactor flow treatment details; basic drainage system and bioreactor design characteristics; and N removal rate and efficiency.

Item Type:Article
Business groups:Horticulture and Forestry Science
Additional Information:Open access
Keywords:Groundwater Nitrate Nonpoint-source pollution Subsurface drainage Tile.
Subjects:Science > Biology > Biochemistry
Science > Biology > Ecology
Agriculture > Agriculture (General) > Agricultural chemistry. Agricultural chemicals
Agriculture > Agriculture (General) > Agriculture and the environment
Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Agriculture > Agriculture (General) > Soil conservation and protection
Agriculture > Agriculture (General) > Fertilisers
Deposited On:05 Jul 2021 03:10
Last Modified:03 Sep 2021 16:46

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