Method for producing volatile fatty acid (VFA) through facultative anaerobic fermentation of kitchen waste

Abstract

The invention provides a method for producing volatile fatty acid (VFA) through facultative anaerobic fermentation of kitchen waste. The method comprises the steps of pulverizing the kitchen waste into granules of which the diameters are less than 3mm, adding strains according to the volume ratio of the strains to the kitchen waste of 1: (1.5-2), adjusting the water content of the inoculated kitchen waste to 88-91%, mixing uniformly, performing the facultative anaerobic fermentation on the uniformly mixed kitchen waste at 34-37 DEG C, and adjusting process parameters according to the fermentation concentration. By adopting the method disclosed by the invention for hydrolyzing the kitchen waste, the time is short, the yield of VFA is high, and the hydrolysis rate is high; the kitchen waste can be efficiently recycled through the process for preparing marsh gas through anaerobic digestion after hydrolysis.

Description

technical field [0001] The invention belongs to the field of food waste resource treatment, and in particular relates to a method for producing volatile fatty acids (VFA) by facultative anaerobic fermentation of food waste. Background technique [0002] Kitchen waste accounts for a relatively large proportion of urban domestic waste in my country, reaching 40% to 60%. With the development of society, the output of kitchen waste is also increasing year by year. Food waste has the characteristics of high moisture content, high organic matter content, and easy corruption. If it is not handled properly, it will inevitably cause resource waste and environmental pollution. Therefore, how to reduce, harmless and recycle food waste has become a common concern. [0003] For the treatment and recycling of kitchen waste, technical methods such as landfill, composting, anaerobic fermentation, and feed are commonly used at home and abroad. Among them, anaerobic digestion biogas technol...

AI Technical Summary

Problems solved by technology

[0004] However, the anaerobic digestion of volatile fatty acids in the prior art has the disadvantages of long hydrolysis and fermentation time, generally not less than 5 days, the yield of fatty acids is not high enough, and the hydrolysis efficiency is low.