Journal
WATER RESEARCH
Volume 47, Issue 16, Pages 6122-6129Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2013.07.033
Keywords
Syngas fermentation; In-situ hydrogen utilization; Fatty acids; Mixed culture; Hollow-fiber membrane biofilm reactor
Funding
- Natural Science Foundation of China [50978244]
- Hundred-Talent Program of CAS
- Fundamental Research Funds for the Central Universities [WK2060190007]
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Gasification of waste to syngas (H-2/CO2) is seen as a promising route to a circular economy. Biological conversion of the gaseous compounds into a liquid fuel or chemical, preferably medium chain fatty acids (caproate and caprylate) is an attractive concept. This study for the first time demonstrated in-situ production of medium chain fatty acids from H-2 and CO2 in a hollow-fiber membrane biofilm reactor by mixed microbial culture. The hydrogen was for 100% utilized within the biofilms attached on the outer surface of the hollow-fiber membrane. The obtained concentrations of acetate, butyrate, caproate and caprylate were 7.4, 1.8, 0.98 and 0.42 g/L, respectively. The biomass specific production rate of caproate (31.4 mmol-C/(L day g-biomass)) was similar to literature reports for suspended cell cultures while for caprylate the rate (19.1 mmol-C/(L day g-biomass)) was more than 6 times higher. Microbial community analysis showed the biofilms were dominated by Clostridium spp., such as Clostridium ljungdahlii and Clostridium kluyveri. This study demonstrates a potential technology for syngas fermentation in the hollow-fiber membrane biofilm reactors. (C) 2013 Elsevier Ltd. All rights reserved.
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