Electrochemical CO2 extraction as innovative pre-treatment method for biological biogas upgrading
The use of biogas as a natural gas substitute or renewable vehicle fuel requires the removal of CO2 from raw biogas in an upgrading process.Different physical-chemical technologies for CO2 separation are currently operational at industrial scale.Most of these methods are still highly energy or chemical intensive.In this study we present an electrochemical technique for CO2 removal via a current-driven extraction of (bi)carbonate ions across an anion exchange membrane.This electrochemically-assisted scrubbing and stripping of CO2 resulted in high CO2 removal efficiencies (up to 100%),without addition of chemicals.The biogas leaving the electrolysis cell could be further upgraded via chemoautotrophic microbial conversion of CO2 to CH4.The reduction of CO2 to CH4 relies on the action of hydrogenotrophic methanogens capable of using H2 gas as sole electron donor for CH4 production.The injection of biomethane produced with electrochemically-produced H2 as sole energy source can be envisaged as a scalable and decentralized storage of excess or off-peak renewable power.CO2 in biogas is thus a suitable candidate as C-source for biomethantion and the proposed electrochemical treatment an innovative and energy-efficient method for biogas pre-treatment.
Biomethane Water electrolysis Power-to-gas Carbon dioxide biomethanation
K.Verbeeck J.De Vrieze M.Biesemans K.Rabaey
Center for Microbial Ecology & Technology (CMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
769-772
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）