Abstract
Denitrification coupled to anaerobic methane oxidation is a recently discovered process performed by bacteria affiliated to the NC10 phylum. These microorganisms could play important roles in the energy-efficient way of anaerobic wastewater treatment where residual dissolved methane might be removed at the expense of nitrate or nitrite. The difficulty to enrich these microorganisms due to a slow growth rate, especially at low temperatures, limited its application in engineering field. In this study, an NC10 bacteria community was enriched from Taihu sediments by a membrane biofilm bioreactor at ambient temperature of 10–25 °C. After 13 months enrichment, the maximum denitrification rate of the enriched culture reached 0.54 mM day−1 for nitrate and 1.06 mM day−1 for nitrite. Anaerobic methane oxidation coupled denitrification was estimated from the 13C-labeled CO2 (13CO2) production during batch incubations with 13CH4. Furthermore, analysis of 16S rRNA genes clone library confirmed the presence of NC10 phylum bacteria and fluorescence in situ hybridization showed that NC10 bacteria dominated the reactor. All of the results indicated the NC10 bacteria community was competitive in terms of treating nitrate-contaminated water or wastewater under natural conditions.
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Acknowledgments
This study was supported by the Science Fund for Creative Research Groups (no. 21221004), China Postdoctoral Science Foundation (no. 2012M510462) Program for Changjiang Scholars, and Innovative Research Team in University and Research Fund (no. 318051417) for the Doctoral Program of Higher Education of Liaocheng University.
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Wang, S., Wu, Q., Lei, T. et al. Enrichment of denitrifying methanotrophic bacteria from Taihu sediments by a membrane biofilm bioreactor at ambient temperature. Environ Sci Pollut Res 23, 5627–5634 (2016). https://doi.org/10.1007/s11356-015-5509-0
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DOI: https://doi.org/10.1007/s11356-015-5509-0