Influence of the mode of reactor operation on the rate and yield of fermentation of the model solid substrate,wheat bran,by a microbial consortium under non-axenic anaerobic conditions |
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Authors: | Christine Dassargues Mamadou Sanou Grégoire Clerfayt Henry Naveau Edmond-Jacques Nyns |
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Institution: | (1) Unit of Bioengineering, Catholic University of Louvain, 2/19, Croix du Sud, B-1348 Louvain-la-Neuve, Belgium |
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Abstract: | Summary Anaerobic fermentation of wheat bran, a model solid substrate, was conducted under non-axenic conditions, in two reactors operated under different modes, all other conditions being strictly identical. The first reactor was a completely-mixed batch reactor. The second reactor was a percolator into which the liquid phase was recirculated in closed loop through the solid substrate acting as a stationary bed. The final yield of fermentation was obtained after 27 days in the completely-mixed batch reactor, and after 14 days only in the percolator. Scanning electron microscopy revealed that numerous micro-organisms adhered to the solid substrate acting as a carrier in the percolator, whereas only very few micro-organisms adhered to the solid substrate in the completely-mixed batch reactor. The results show that obtaining a durable direct contact between micro-organisms and their solid substrate improves the rate of solids degradation. |
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