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- Denitrifying Woodchip Bioreactors: A Microbial Solution for Nitrate in Agricultural Wastewater—A Review
- Sua Lee , Min Cho , Michael J. Sadowsky , Jeonghwan Jang
- J. Microbiol. 2023;61(9):791-805. Published online August 18, 2023
- DOI: https://doi.org/10.1007/s12275-023-00067-z
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- 2 Web of Science
- 3 Crossref
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Abstract
- Nitrate ( NO3 −) is highly water-soluble and considered to be the main nitrogen pollutants leached from agricultural soils. Its presence in aquatic ecosystems is reported to cause various environmental and public health problems. Bioreactors containing microbes capable of transforming NO3 − have been proposed as a means to remediate contaminated waters. Woodchip bioreactors (WBRs) are continuous flow, reactor systems located below or above ground. Below ground systems are comprised of a trench filled with woodchips, or other support matrices. The nitrate present in agricultural drainage wastewater passing through the bioreactor is converted to harmless dinitrogen gas ( N2) via the action of several bacteria species. The WBR has been suggested as one of the most cost-effective NO3 −-removing strategy among several edge-of-field practices, and has been shown to successfully remove NO3 − in several field studies. NO3 − removal in the WBR primarily occurs via the activity of denitrifying microorganisms via enzymatic reactions sequentially reducing NO3 − to N2. While previous woodchip bioreactor studies have focused extensively on its engineering and hydrological aspects, relatively fewer studies have dealt with the microorganisms playing key roles in the technology. This review discusses NO3 − pollution cases originating from intensive farming practices and N-cycling microbial metabolisms which is one biological solution to remove NO3 − from agricultural wastewater. Moreover, here we review the current knowledge on the physicochemical and operational factors affecting microbial metabolisms resulting in removal of NO3 − in WBR, and perspectives to enhance WBR performance in the future.
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Complete genome sequence of
Neobacillus
sp. strain OS1-2, a denitrifying bacterium isolated from apple orchard soil
Jinwoo Ahn, Jeonghwan Jang, Elinne Becket
Microbiology Resource Announcements.2025;[Epub] CrossRef - Dissimilatory nitrate reductions in soil Neobacillus and Bacillus strains under aerobic condition
Seohyun Ahn, Min Cho, Michael J. Sadowsky, Jeonghwan Jang
Journal of Microbiology.2025; 63(2): e2411019. CrossRef - Mn-oxidizing microalgae and woodchip-denitrifying bioreactor system for recovering manganese and removing nitrogen from electrolytic manganese metal industrial tailwater
Xinyue Gong, Qin Peng, Ruixin Jiang, Na Yang, Cijun Xing, Rui Wang
Journal of Hazardous Materials.2025; 488: 137383. CrossRef
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Complete genome sequence of
Neobacillus
sp. strain OS1-2, a denitrifying bacterium isolated from apple orchard soil
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