Effect of carbon source and competition for electrons on nitrous oxide reduction in a mixed denitrifying microbial community |
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| Affiliation: | 1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China;2. Advanced Water Management Center, The University of Queensland, St Lucia, QLD 4072, Australia;1. Key Laboratory of Integrated Regulation and Resource Development on ShallowLakes, Ministry of Education, Hohai University, Nanjing 210098, China;2. College of Environment, Hohai University, Nanjing 210098, China;3. State Key Engineering Research Center of Efficient Utilization of Water Resources and Engineering Safety, Hohai University, Nanjing 210098, China;4. College of Environment, Nanjing University, Nanjing 210093, China;1. Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore;2. School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;1. School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China;2. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aza, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan;1. Department of Biosystems Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium;1. Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia;2. Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, Ghent 9000, Belgium;3. Nanyang Technological University, SCELSE, Singapore 637551, Singapore |
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| Abstract: | The competition for electrons has been recently demonstrated to affect the reduction rates of the nitrogen oxides in a methanol enriched denitrifying community. The aim of this study was to test if electron competition also occurred when other substrates were used for denitrification and if that could have an effect on the potential nitrous oxide (N2O) production and subsequent consumption. A denitrifying culture was developed in a sequencing batch reactor using nitrate as electron acceptor and a combination of acetate, ethanol and methanol as carbon sources. Four sets of batch tests were conducted using acetate, ethanol, methanol and a combination of the three carbon sources respectively. For each set the effect of nitrate, nitrite and nitrous oxide on each other reduction rates when present individually or in combination was assessed. Results show that reduction rates are affected by the type of substrate added, probably due to different microbial populations specialized with consuming a particular substrate. Also, N2O reduction rate is the most reduced under the different electron competition scenarios tested, which results in N2O accumulation in some cases. The effect of substrate limitation on N2O reduction was also assessed. |
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| Keywords: | Denitrification Electron competition Nitrous oxide Carbon sources Reduction rates |
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