Influence of growth and high mould concentration on the pressure drop in solid state fermentations

Abstract Aspergillus niger was grown on Amberlite IRA-900 imbibed with a solution containing high concentrations of sucrose ( S i = 100, 200, 300 and 400 g/litre) in static aerated fermentors. Growth was followed in dry biomass, biomass protein, CO 2 production and pressure drop ( DP ). The DP allowed the monitoring of germination, vegetative growth, limitation and the onset of sporulation for the four concentrations of sucrose studied. Concentrations up to 103 mg dry biomass/g dry support were obtained with S i = 400 g/litre and these reduced the relative intrinsic permeability to 0·0125. Under this condition the mould occupies 34% of the free space. DP increase was related to CO 2 production.

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