Evaluation of a denitrification wall to reduce surface water nitrogen loads

Journal of Environmental Quality
Casey A Schmidt, Mark W Clark

Abstract

Denitrification walls have significantly reduced nitrogen concentrations in groundwater for at least 15 yr. This has spurred interest in developing methods to efficiently increase capture volume to reduce N loads in larger watersheds. The objective of this study was to maximize treatment volume by locating a wall where a large groundwatershed was funneled toward seepage slope headwaters. Nitrogen concentration and load were measured before and after wall installation in paired treatment and control streams. Beginning 2 d after installation, nitrogen concentration in the treatment stream declined from 6.7 ± 1.2 to 3.9 ± 0.78 mg L and total N loading rate declined by 65% (391 kg yr) with no corresponding decline in the control watershed. This wall, which only comprised 10 to 11% of the edge of field area that contributed to the treatment watershed, treated approximately 60% of the stream discharge, which confirmed the targeted approach. The total load reduction measured in the stream 155 m downstream from the wall (340 kg yr) was higher than that found in another study that measured load reductions in groundwater wells immediately around the wall (228 kg yr). This indicated the possibility of an extended impact on denitrification...Continue Reading

References

Sep 8, 2001·Water Research·L A Schipper, M Vojvodić-Vuković
Jul 7, 2005·Journal of Environmental Quality·Louis A SchipperMaja Vojvodic-Vukovic
Feb 13, 2008·Journal of Environmental Quality·Dan B JaynesTim B Parkin
Aug 27, 2011·Journal of Environmental Quality·Rita ShihDavid L Rudolph

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Citations

Dec 12, 2012·Environmental Science and Pollution Research International·X Q LiangKüppers Stephan
Jul 29, 2015·Environmental Toxicology·Yongfang ChenJiexin Deng
May 3, 2016·Journal of Environmental Quality·Emily M BockZachary M Easton
May 3, 2016·Journal of Environmental Quality·Natasha L HooverThomas B Moorman
Apr 6, 2019·Journal of Environmental Quality·Rachel L NifongMatthew T Moore
Aug 11, 2018·The Science of the Total Environment·Michal ŠerešTereza Hnátková

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