Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 54, Issue 12, Pages 7629-7638Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.0c00912
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Funding
- ARC Linkage project [LP180100772]
- MERINO (Maximizing Energy Recovery through Innovative Nitrogen remOval) - Melbourne Water Corporation
- Queensland Urban Utilities
- South Australian Water Corporation
- Advanced Queensland Research Fellowship
- Australian Research Council Australian Laureate Fellowship [FL170100086]
- Australian Research Council [LP180100772] Funding Source: Australian Research Council
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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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