Simultaneous Removal of Dissolved Methane and Nitrogen from Synthetic Mainstream Anaerobic Effluent
Nitrogen
General Chemistry
1600 Chemistry
01 natural sciences
7. Clean energy
6. Clean water
12. Responsible consumption
Bioreactors
13. Climate action
2304 Environmental Chemistry
RNA, Ribosomal, 16S
Ammonium Compounds
Denitrification
Environmental Chemistry
Anaerobiosis
Methane
Oxidation-Reduction
0105 earth and related environmental sciences
DOI:
10.1021/acs.est.0c00912
Publication Date:
2020-05-20T13:03:51Z
AUTHORS (7)
ABSTRACT
Anaerobic technologies have been proposed as a promising solution to enhance bioenergy recovery and to transform a wastewater treatment plant (WWTP) from an energy consumer to an energy exporter. However, 20-60% of the methane produced remains dissolved in the anaerobically treated effluent, which is a potent greenhouse gas and is easily stripped out in the aeration tank. This study aims to develop a solution using dissolved methane to support denitrification, thus simultaneously enhancing nitrogen removal and achieving beneficial use of dissolved methane. By coupling anaerobic ammonium oxidation (anammox) with nitrite/nitrate-dependent anaerobic methane oxidation (n-DAMO), up to 85% of dissolved methane and more than 99% of nitrogen were removed in parallel in a biofilm system. Mass balance was conducted during both long-term operation and short-term batch tests, which indicated that n-DAMO bacteria and n-DAMO archaea indeed contributed jointly to the methane removal. The 16S rRNA gene amplicon sequencing further showed the co-presence of n-DAMO bacteria and n-DAMO archaea, while anammox bacteria were detected with a low relative abundance. This proposed technology can potentially be applied to reduce the carbon footprint and to save the organic carbon consumption in WWTPs.
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