Growth monitoring of <Emphasis Type="Italic">Fibrobacter succinogenes</Emphasis> by pressure measurement |
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Authors: | G Christophe E Guiavarch C Creuly C-G Dussap |
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Institution: | (1) Laboratoire de Génie Chimique et Biochimique, Polytech’ Clermont-Ferrand, Université Blaise Pascal, 24 avenue des Landais, BP 206, 63174 Aubière Cedex, France |
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Abstract: | In life support systems, such as the MELiSSA (Micro-Ecological Life Support Alternative) project, developed by the European
Space Agency, the aim is to understand and assemble artificial ecosystems for ensuring human subsistence in space. Fibrobacter succinogenes, an anaerobic bacterium, was used for the degradation of vegetable wastes produced in higher plants chambers, but the process
does not allow the monitoring of biomass concentration and degradation rates. This study proposes a growth and a degradation
monitoring technique using pressure measurements. First, volatile fatty acids (VFA) production was compared with biomass growth
and with CO2 production. The experiments were carried out in batch and fed-batch processes on glucose and on vegetables. The results have
shown that a link could be established between VFA production, degradation rate and gas pressure measurements. Thus, the pressure
could be used both as a relevant variable for online evaluation of biomass growth and of degradation of complex vegetable
wastes. |
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Keywords: | Anaerobic fermentation Fibrobacter succinogenes Growth monitoring CO2 production Vegetable degradation |
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