Journal
APPLIED ENERGY
Volume 235, Issue -, Pages 1061-1071Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2018.11.006
Keywords
Biogas; In-situ; Ex-situ; Biological methanation; Full-scale upgrading strategies; Power to gas
Categories
Funding
- European Union [316838]
- Science Foundation Ireland centre MaREI [12/RC/2302, 16/SP/3829]
- Gas Networks Ireland through The Green Gas Innovation Group
- ERVIA
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This study investigated in-situ and ex-situ biological methanation strategies for biogas upgrading potential. The addition and circulation of hydrogen with a ceramic gas diffuser unit revealed positive effects on the metha-nogenic process. A short-term maximum methane productivity of 2.5 L CH4 per L reactor volume per day (L(vR)(-1)d(-1)) was obtained in-situ. Adverse effects of elevated dissolved hydrogen concentrations on acetogenesis became evident. Ex-situ methanation in a reactor subjected to gas recirculation for recurrent 24 h periods achieved methane formation rates of 3.7 L CH(4)L(vR)(-1)d(-1). A biomethane with methane concentrations in excess of 96% successfully demonstrated the potential for gas grid injection. A theoretic model supplying gases continuously into a sequential ex-situ reactor system and steadily displacing the upgraded biogas confirmed similar methane formation performance and was advanced to a full-scale concept. Gas conversion efficiency of 95% producing biomethane at 85% methane content was attained. A hybrid model, where an in-situ grass digester is followed by an ex-situ reactor, is proposed as a novel upgrading strategy.
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