Journal
BIORESOURCE TECHNOLOGY
Volume 146, Issue -, Pages 234-239Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.07.049
Keywords
Coke oven gas; Biomethanation; Biogas upgrading; Anaerobic digestion
Funding
- Danish Council for Independent Research [12-126632]
- Hans Christian Orsted Postdoc Program from Technical University of Denmark
- Interreg IV project Bioref-Oresund [2104-06-0004]
- Science and Technology Commission of Shanghai Municipality [12230707600]
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A new method for simultaneous coke oven gas (COG) biomethanation and in situ biogas upgrading in anaerobic reactor was developed in this study. The simulated coke oven gas (SCOG) (92% H-2 and 8% CO) was injected directly into the anaerobic reactor treating sewage sludge through hollow fiber membrane (HFM). With pH control at 8.0, the added H-2 and CO were fully consumed and no negative effects on the anaerobic degradation of sewage sludge were observed. The maximum CH4 content in the biogas was 99%. The addition of SCOG resulted in enrichment and dominance of homoacetogenetic genus Treponema and hydrogenotrophic genus Methanoculleus in the liquid, which indicated that H-2 were converted to methane by both direct (hydrogenotrophic methanogenesis) and indirect (homoacetogenesis + aceticlastic methanogenesis) pathways in the liquid. However, the aceticlasitic genus Methanosaeta was dominant for archaea in the biofilm on the HFM, which indicated indirect (homoacetogenesis + aceticlastic methanogenesis) H-2 conversion pathway on the biofilm. (c) 2013 Elsevier Ltd. All rights reserved.
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