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Denitrifying bioreactor microbiome: Understanding pollution swapping and potential for improved performance
Author(s) -
Hartfiel Lindsey M.,
Schaefer Abby,
Howe Adina C.,
Soupir Michelle L.
Publication year - 2021
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.1002/jeq2.20302
Subject(s) - bioreactor , denitrifying bacteria , anammox , denitrification , environmental science , nitrate , environmental chemistry , bioreactor landfill , pulp and paper industry , environmental engineering , microbial population biology , biochemical engineering , chemistry , ecology , nitrogen , biology , engineering , genetics , organic chemistry , bacteria
Denitrifying woodchip bioreactors are a best management practice to reduce nitrate–nitrogen (NO 3 –N) loading to surface waters from agricultural subsurface drainage. Their effectiveness has been proven in many studies, although variable results with respect to performance indicators have been observed. This paper serves the purpose of synthesizing the current state of the science in terms of the microbial community, its impact on the consistency of bioreactor performance, and its role in the production of potential harmful by‐products including greenhouse gases, sulfate reduction, and methylmercury. Microbial processes other than denitrification have been observed in these bioreactor systems, including dissimilatory nitrate reduction to ammonia (DNRA) and anaerobic ammonium oxidation (anammox). Specific gene targets for denitrification, DNRA, anammox, and the production of harmful by‐products are identified from bioreactor studies and other environmentally relevant systems for application in bioreactor studies. Lastly, cellulose depletion has been observed over time via increasing ligno‐cellulose indices, therefore, the microbial metabolism of cellulose is an important function for bioreactor performance and management. Future work should draw from the knowledge of soil and wetland ecology to inform the study of bioreactor microbiomes.