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[The solid-state fermentation with double dynamic of gas phase for celluloses].

To utilize the advantages of solid-state fermentation for cellulose production, the solid-state fermentation with double dynamic of gas phase was proposed. The studies showed as follows: under the optimum operating conditions, the air pulsation range, the air pulsation periods and the air internal circulation, the fermentation temperatures were controlled quite well and the maximum temperature difference was 0.12 degree C/cm at a bed height of 9.0 cm; the water activity in the fermentation with steam-exploded straw as substrate was very suitable for the fungal growth; and with the observation of microbial growth by ESEM. It was discovered that air-pulsating fermentation was more advantageous to cellulose production and microorganism growth than static fermentation. The period of air-pulsating fermentation (60 h) was almost shorter 1/3 and its filter paper activity of enzymes (20.36 IU/mg) was larger 1 time than in the static fermentation with the fermentation period 84 h and the enzyme activity (10.82 IU/mg). Thus, this double dynamic of gas laid strong basis for cellulose production on a large scale.