Abstract: Kitchen waste is perishable and plenty of organic compounds,and it can be transformed into feedstuff by solid-state fermentation,which provides a useful way for the reutilization of food waste.In this study,the target strain was screened from two yeast species and two trichoderma strains for the fermentation efficiency to product protein feedstuff.By production detection of crude protein and consumption detections of total sugar and reducing sugar,Aspergillus niger F3 was screened as the candidate.The results showed that the optimum fermentation process was fermentation temperature 30 ℃,initial pH 5.3,NaCl 2.5%.Under this condition,the crude protein content in fermentation product reached 31.53% and increased 22% compared with kitchen waste,which is in line with the requirements of the standard protein feedstuff.

Key words: kitchen waste, solid-state fermentation, Aspergillus niger, protein feed