Abstract

The production of acetic acid from cellulose using Clostridium thermocellum was investigated. Fermentations were carried out in a batch mode to study the effects of the initial substrate concentration (S 0) and of the initial inoculum concentration (X 0) on acetic acid and ethanol production. The yields of fermentation products are reported for experiments carried out at 60°C and pH 7·0 using 0·5% and 1% pure cellulose. The analysis of the balance between substrate utilization and product formation suggests a high probability of an homofermentative pathway for acetic acid production, with a yield of 3 moles of acetate produced per mole of hexose-equivalents consumed.

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