Impact of hydraulic residence time on nitrate removal in pilot-scale woodchip bioreactors Martin, E. A. Davis, Morgan Moorman, Thomas Isenhart, Thomas Soupir, Michelle
dc.contributor.department Natural Resource Ecology and Management
dc.contributor.department Agronomy
dc.contributor.department Agricultural and Biosystems Engineering
dc.contributor.other Iowa Nutrient Research Center 2019-03-09T12:56:53.000 2020-06-29T22:36:07Z 2020-06-29T22:36:07Z 2019-05-01
dc.description.abstract <p>Nitrate (NO3−N) export from row crop <a href="" title="Learn more about Farming System">agricultural systems</a> with subsurface tile drainage continues to be a major <a href="" title="Learn more about Water Quality">water quality</a> concern. Woodchip <a href="" title="Learn more about Bioreactor">bioreactors</a> are an effective edge-of-field practice designed to remove NO3−N from tile drainage. The NO3−N <a href="" title="Learn more about Removal Rate">removal rate</a> of woodchip bioreactors can be impacted by several factors, including <a href="" title="Learn more about hydraulic residence time">hydraulic residence time</a>(HRT). This study examined the impact of three HRTs, 2 h, 8 h, and 16 h, on NO3−N removal in a set of nine pilot-scale woodchip bioreactors in Central Iowa. NO3−N concentration reduction from the inlet to the outlet was significantly different for all HRTs (p < 0.05). The 16 h HRT removed the most NO3−N by concentration (7.5 mg L−1) and had the highest <a href="" title="Learn more about Removal Efficiency">removal efficiency</a> at 53.8%. The 8 h HRT removed an average of 5.5 mg L−1 NO3−N with a removal efficiency of 32.1%. The 2 h HRT removed an average of 1.3 mg L−1 NO3−N with a removal efficiency of 9.0%. The 2 h HRT had the highest NO3−N mass removal rate (MRR) at 9.0 g m−3 day−1, followed by the 8 h HRT at 8.5 g m−3 day−1, and the 16 h HRT at 7.4 g m−3 day−1, all of which were statistically different (p < 0.05). Significant explanatory variables for removal efficiency were HRT (p < 0.001) and influent NO3−N concentration (p < 0.001), (R2 = 0.80), with HRT accounting for 93% contribution. When paired with results from a companion study, the ideal HRT for the bioreactors was 8 h to achieve maximum NO3−N removal while reducing the impact from <a href="" title="Learn more about Greenhouse Gas Emission">greenhouse gas emissions</a>.</p>
dc.description.comments <p>This article is published as Martin, E. A., M. P. Davis, T. B. Moorman, T. M. Isenhart, and M. L. Soupir. "Impact of hydraulic residence time on nitrate removal in pilot-scale woodchip bioreactors." <em>Journal of Environmental Management</em> 237 (2019): 424-432. DOI: <a href="" target="_blank">10.1016/j.jenvman.2019.01.025</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 2290
dc.identifier.contextkey 13946220
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/1005
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 18:12:35 UTC 2022
dc.source.uri 10.1016/j.jenvman.2019.01.025
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Natural Resources Management and Policy
dc.subject.keywords Hydraulic residence time
dc.subject.keywords Pilot-scale
dc.subject.keywords Woodchip bioreactors
dc.subject.keywords Water quality
dc.subject.keywords Nutrient removal
dc.title Impact of hydraulic residence time on nitrate removal in pilot-scale woodchip bioreactors
dc.type article
dc.type.genre article
dspace.entity.type Publication
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