Method for producing acetic acid by fermenting kitchen waste

Abstract

The invention relates to a method for producing acetic acid by fermenting kitchen waste. The method comprises the following steps: firstly adding high-activity dry yeast in crushed kitchen waste, and uniformly mixing, wherein the adding amount of the high-activity dry yeast accounts for 2-5wt% of the weight of the kitchen waste; performing anaerobic fermenting at 20-30 DEG C for 72-96 hours, and then adding calcium carbonate, wherein the adding mount of the calcium carbonate ensures that the pH value is kept at 5.5-6.5 in the fermentation process; then adding acetic bacteria, wherein the adding amount of the acetic bacteria accounts for 8-12wt% of the weight of the kitchen weight; performing aerobic fermenting at 30-37 DEG C for 72-96 hours; then performing the solid-liquor separation to obtain the kitchen waste fermenting liquor and kitchen waste residue, sending kitchen waste residue to refuse landfill, backfilling the kitchen waste residue to refuse landfill and distilling, refluxing and purifying the kitchen waste fermenting liquor so as to obtain the acetic. Each liter of kitchen waste fermenting liquid is capable of producing 24-28g of acetic acid, the acetic acid accounts for 84-93% of the total mass of the organic acid in the fermenting liquor, the heteroacid variety in the fermenting liquor is less, the production cost is low and the aim of re-utilizing the kitchen waste is realized.

Description

technical field [0001] The invention relates to a method for producing acetic acid by fermentation of kitchen waste. Specifically, the biotechnology method is used, that is, yeast and acetic acid bacteria to jointly process food waste and produce acetic acid. It belongs to the technical field of bioengineering. Background technique [0002] Food waste is the most important type of food waste, including food processing leftovers (kitchen waste) and food residues (swill) from families, schools, canteens and catering industries. The composition of food waste is complex, mainly including rice and flour food residues, vegetables, animal and vegetable oils, meat and bones, etc. In terms of chemical composition, the sugar content in kitchen waste is high, while swill is mainly composed of starch, cellulose, protein, and lipid, and is high in salt and fat. Therefore, food waste can be reused as biomass energy, and using it to produce acetic acid is one of the effective ways to re...

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Problems solved by technology

The Chinese patent with the publication number CN101085999 provides a method for bacteria chaff to promote lactic acid fermentation of food waste, and the Chinese patent with the publication number CN103290069 provides a method for directly fermenting fumaric acid from food waste by rhizopus. Publication number CN101724679 The Chinese patent provides a method of using food waste to produce biodiesel, but there is no research on the use of food waste for acetic acid fermentation

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