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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.