Journal
WATER RESEARCH
Volume 106, Issue -, Pages 79-85Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2016.09.046
Keywords
Nitrous oxide accumulation; Denitrification biofilter; Functional gene; Quantitative relationship; C/N ratio
Funding
- Key Project of China Spark Program [GL2015007]
- Collaborative Innovation Center for Regional Environmental Quality
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Heterotrophic denitrification is usually inhibited by insufficient carbon sources; however, the underlying mechanisms responsible for nitrous oxide (N2O) accumulation within denitrification at low carbon:- nitrogen (C/N) ratios have not been quantified from a molecular level. In this study, five denitrification biofilters were developed and exhibited efficiency (total nitrogen: 18.5%-92.2%; nitrate nitrogen: 42.9% 99.5%; chemical oxygen demand: 50.5%-93.7%) in remediating micro-polluted water with C/N ratios ranging between 0.65 and 3.0. A combined analysis revealed that the coupling of anaerobic ammonium oxidation (ANAMMOX) and denitrification accounted for N2O accumulation in the biofilters, and the key drivers of the N2O accumulation rates were qnorB/nirK, nosZ/(narG + napA), amx/(nirS + nirK), narG/bacteria and qnorB/bacteria. Our study demonstrated that genetic association was indicative of microbial processes relative to nitrogen cycling and reflected N2O flux within denitrification biofilters at low C/N ratios. (C) 2016 Elsevier Ltd. All rights reserved.
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