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Managing dissolved methane gas in anaerobic effluents using microbial resource management-based strategies
- Gupta, Vedansh, Goel, Ramesh
- Bioresource technology 2019 v.289 pp. 121601
- Methylococcus capsulatus, ammonia, biofuels, chemical oxygen demand, denitrification, effluents, methane, methanol, methanotrophs, nitrate nitrogen, oxidants, oxidation
- This study reports the findings of three independent microbial resource management-based strategies to manage dissolved methane (D-CH4) gas in anaerobic effluents. In the first approach, an aerobic methanotroph Methylococcus capsulatus was immobilized. A maximum of 1.75 kg COD m−3 d−1 at a hydraulic retention time of 0.5 h was recorded in the attached growth aerobic methane oxidizing reactor. In the second strategy, denitrifying methane oxidizing organisms (DAMO) were first enriched in a lab-scale batch reactor which enabled a maximum methane oxidation rate of 0.31 kg COD m−3 d−1. In the last strategy, a mixed community of aerobic ammonia oxidizers was immobilized on sponge carriers and used to convert the D-CH4 gas into useful biofuel methanol at a rate of 0.73 kg COD m−3 d−1 equivalent of COD with a methanol production of 31.5 g COD m−3 d−1. On a COD basis, the amount of methanol generated could denitrify nearly 7 mg L−1 of NO3-N.