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Acid protease production was carried out by solid state fermentation (SSF) with Aspergillus niger using kitchen waste as the principal raw material. The SSF conditions were studied and the optimal one was identified. This study explored effects of different water contents in SSF medium, different inoculum sizes and different fermentation time on acid protease activities by following the one-factor-at-a-time method. Based on the results obtained, the optimal fermentation conditions for the production of c acid protease, were are as follows: 30g of kitchen waste content, 20mL of initial water content, 4mL of inoculum, and 70h ofas fermentation time. Under these fermentation conditions, the activity of the acid protease was 223.518 U.

KITCHEN WASTE SOLID STATE FERMENTATION BY Aspergillus niger TO PRODUCE ACID PROTEASE