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Title	Fatty acids production from hydrogen and carbon dioxide by mixed culture in the membrane biofilm reactor
ID_Doc	8595
Authors	Zhang, F; Ding, J; Zhang, Y; Chen, M; Ding, ZW; van Loosdrecht, MCM; Zeng, RJ
Title	Fatty acids production from hydrogen and carbon dioxide by mixed culture in the membrane biofilm reactor
Year	2013
Published	Water Research, 47.0, 16
Abstract	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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