Simultaneous Removal of Dissolved Methane and Nitrogen from Synthetic Mainstream Anaerobic Effluent
| Autor: | Shihu Hu, Jianhua Guo, Zhuan Khai Lim, Tao Liu, Hui Chen, Zhiguo Yuan, Jie Li |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Denitrification
Nitrogen 010501 environmental sciences 01 natural sciences 7. Clean energy Methane 12. Responsible consumption chemistry.chemical_compound Bioreactors RNA Ribosomal 16S Ammonium Compounds Bioreactor Environmental Chemistry Anaerobiosis Effluent 0105 earth and related environmental sciences Chemistry General Chemistry Pulp and paper industry 6. Clean water 13. Climate action Anammox Anaerobic oxidation of methane Sewage treatment Aeration Oxidation-Reduction |
| Zdroj: | Environmental Science & Technology. 54:7629-7638 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.0c00912 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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