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Ammonia removal through combined methane oxidation and nitrification-denitrification and the interactions among functional microorganisms.

Authors
  • Cao, Qin1
  • Li, Xiaochuan2
  • Jiang, Huier1
  • Wu, Han3
  • Xie, Zhijie1
  • Zhang, Xiaoyi1
  • Li, Na4
  • Huang, Xinyi1
  • Li, Zhidong1
  • Liu, Xiaofeng5
  • Li, Dong6
  • 1 CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China. , (China)
  • 2 Beijing Lichuan Foundation engineering co. LTD, Beijing 100000, China. , (China)
  • 3 Sichuan Zotederun Technology co. LTD, Chengdu 610041, China. , (China)
  • 4 Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China. , (China)
  • 5 CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China. Electronic address: [email protected] , (China)
  • 6 CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China. Electronic address: [email protected] , (China)
Type
Published Article
Journal
Water research
Publication Date
Jan 01, 2021
Volume
188
Pages
116555–116555
Identifiers
DOI: 10.1016/j.watres.2020.116555
PMID: 33137529
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

It would be highly beneficial to use the methane produced by anaerobic digestion, which is low cost and accessible, as the carbon source in the removal of nitrogenous contaminants in wastewater. However, there is a knowledge gap regarding coupling systems that entail methane oxidation, nitrification, and denitrification, which restricts their industrial application. In this study, we acclimated a mixed culture to deal with simultaneous nitrification-denitrification coupled to methane oxidation in a laboratory-scale hollow-fiber membrane biofilm reactor, which achieved a steady ammonia removal rate of 38.09 mg N/(L•d). Furthermore, a series of batch experiments were conducted to test methane oxidation coupled to nitrate denitrification (AME-D3), nitrite denitrification (AME-D2), and simultaneous nitrification and denitrification (ME-SND). The molar ratio between methane consumed and nitrate reduced (C/N) equals 10 and 5 mol CH4C mol-1 NO3N in AME-D3 and AME-D2, averagely and respectively. Without methane injection, the removal of nitrates and nitrites was very low, indicating that the coupling of nitrate/nitrite denitrification and methane oxidation was beneficial. The average ammonia removal rates in the 20% O2 and 25% O2 groups were 20.06 and 22.03 mg N/(L•d) in the ME-SND system, respectively. Without methane, the ammonia oxidation rate declined, and large amounts of nitrite accumulated. As traditional ammonia and nitrite oxidation approaches are autotrophic, we proposed the possibility of heterotrophic nitrification-aerobic denitrification (HN-AD). To study the coupling systems, the microbial communities and functional bacteria were analyzed. The results indicated that the system contained a guild of methanotrophs (mainly Methylobacter) and HN-AD bacteria (mainly Chrysobacterium and Comamonas). Copyright © 2020. Published by Elsevier Ltd.

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