United States Department of Transportation
i
Enhancing Nitrogen Removal in Stormwater Treatment Facilities for Transportation
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2015-01-01
[PDF-1.88 MB]
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TRIS Online Accession Number:01570257
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Edition:Final Report
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Abstract:Stormwater from roadways is a point source of pollution. State departments of transportation (DOTs) must comply with Total Maximum Daily Load (TMDL) regulations for nutrients such as nitrogen, which causes water quality impairment. Existing stormwater treatment technologies, such as bioretention cells, do not remove nitrogen adequately to meet water quality standards. New technologies that can more effectively remove nitrogen and reduce the footprint required for stormwater treatment will result in significant savings for State DOTs. The authors have hypothesized that biochar can be used in bioretention cells to promote microbial removal of nitrate from stormwater and improve bioretention cell performance. The goal of this project is to experimentally test this hypothesis and produce the data necessary to (1) develop a better understanding of biochar-enhanced denitrification and (2) secure multi-year support for a field-scale assessment of the proposed technology. The authors established a culture of the anaerobic bacterium Geobacter metallireducens and ”trained” it to utilize nitrate as an electron acceptor. Batch experiments were carried out to illustrate the ability of a commercial wood biochar, which is being tested in a field detention cell in Delaware, to support nitrate removal by G. metallireducens. This project provided direct or indirect research support for 12 students and resulted in 1 conference paper, 1 conference presentation, 3 seminars/public lectures, and 3 awarded multi-year grants.
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