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Membranes 2017, 7(2), 26; doi:10.3390/membranes7020026

Anaerobic Membrane Bioreactor for Continuous Lactic Acid Fermentation

1
Institute of Bioprocess Engineering and Membrane Technology, University of Applied Sciences Mittelhessen, Giessen 35390, Germany
2
Department of Chemical Engineering, Kansas State University, Manhattan, KS 66506, USA
3
Faculty of Biology and Chemistry, Justus Liebig University Giessen, Giessen 35390, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Baoqiang Liao
Received: 31 January 2017 / Revised: 19 April 2017 / Accepted: 27 April 2017 / Published: 3 May 2017
(This article belongs to the Special Issue Anaerobic Membrane Bioreactors)
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Abstract

Membrane bioreactor systems can enhance anaerobic lactic acid fermentation by reducing product inhibition, thus increasing productivity. In batch fermentations, the bioconversion of glucose is strongly inhibited in the presence of more than 100 g·L−1 lactic acid and is only possible when the product is simultaneously removed, which can be achieved by ceramic membrane filtration. The crossflow velocity is a more important determinant of flux than the transmembrane pressure. Therefore, to stabilize the performance of the membrane bioreactor system during continuous fermentation, the crossflow velocity was controlled by varying the biomass concentration, which was monitored in real-time using an optical sensor. Continuous fermentation under these conditions, thus, achieved a stable productivity of ~8 g·L−1·h−1 and the concentration of lactic acid was maintained at ~40 g·L−1 at a dilution rate of 0.2 h−1. No residual sugar was detected in the steady state with a feed concentration of 50 g·L−1. View Full-Text
Keywords: anaerobic membrane bioreactor; lactic acid; membrane filtration; membrane fouling; continuous fermentation; optical sensor anaerobic membrane bioreactor; lactic acid; membrane filtration; membrane fouling; continuous fermentation; optical sensor
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Fan, R.; Ebrahimi, M.; Czermak, P. Anaerobic Membrane Bioreactor for Continuous Lactic Acid Fermentation. Membranes 2017, 7, 26.

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