期刊
ENERGY
卷 135, 期 -, 页码 294-302出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2017.06.133
关键词
Biomethanation; Biogas upgrading; Gas recycle; Hydrogenotrophic methanogens
资金
- Research Corporation of University of Hawaii [4502481]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) of the Republic of Korea [20163010092150]
- Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea [20163010092150]
- Pacific Biodiesel Technologies of U.S. [4502481]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20163010092150] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Biomethanation by hydrogenotrophic methanogens has been proven as a potential process for managing renewable power intermittency and upgrading biogas. The present work aimed to enrich hydrogenotrophic methanogens under different mixing conditions (gas recycle vs. mechanical mixing) and temperatures (mesophilic vs. thermophilic conditions) for biogas upgrading. The synthetic gas (H-2:CO2 = 4:1) was fed to the reactor bottom at a hydrogen injection rate (HIR) of 1.6 L H-2 L-1 d(-1). The gas recycle (100 L L-1 d(-1)) under thermophilic condition was found to be the most effective, reaching over 96% H-2 conversion to CH4 within 15 d of operation. Archaea community analysis performed by 454 pyrosequencing showed that the sequence of Methanosaeta sp. decreased while obligate-hydrogenotrophic methanogens increased: Methanoculleus chikugoensis (19.5%) and Methanothermococcus the rmolithotrophicus (28.1%) under mesophilic and thermophilic condition, respectively. To the thermophilic enriched culture, the biogas produced from an up-flow anaerobic sludge blanket reactor with additional hydrogen (four times of CO2) was fed at various HIRs for 200 d. As HIR increased, H-2 consumption rate also increased with CO2 removal contained in the biogas. Up to an HIR increase to 19.2 L H-2 L-1 d(-1), the high calorific biomethane (96% of CH4) could be obtained at gas recycle rate of 200 L L-1 d(-1). (C) 2017 Elsevier Ltd. All rights reserved.
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