A compound microbial preparation for inhibiting anaerobic fermentation overacidification of vegetable waste

Abstract

The invention relates to a compound microbial preparation for inhibition of anaerobic fermentation over-acidification of vegetable wastes. The compound microbial preparation includes bacillus subtilis, bacillus cereus, bacillus megaterium, bacillus licheniformis, pichia pastoris, and saccharomyces cerevisiae. In an anaerobic fermentation environment, the microbial preparation has abilities of both producing alkaline substances and decomposing organic acids, can maintain acid-base balance of a vegetable waste anaerobic fermentation system, is well suitable for wet and dry anaerobic fermentation with the vegetable wastes as raw materials, and can guarantee smooth implementation of a biogas production process.

Description

technical field [0001] The invention relates to a compound microbial preparation for inhibiting anaerobic fermentation overacidification of vegetable waste, and belongs to the technical field of biogas additives. Background technique [0002] With the promotion and popularization of advanced agricultural production equipment and technologies such as new greenhouses and precision fertilization, as well as the introduction and improvement of many new vegetable varieties, my country's vegetable planting industry has achieved vigorous development, and a wide variety of vegetables has greatly enriched urban and rural areas. The masses' vegetable baskets have also significantly increased the economic income of farmers. However, it is worth noting that in the process of planting vegetables, it is inevitable to produce plant parts such as stems, leaves, and roots that are not suitable for consumption, and in the process of product transportation and marketing, some vegetables may als...

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Problems solved by technology

[0004] Vegetable waste has the characteristics of water content, high sugar content, perishability, and large compositional differences. When anaerobic fermentation is performed with it as raw material, the fermentation speed is usually fast because the substrate is easily utilized by the initial fermentation microorganisms, resulting in suboptimal fermentation. High-grade metabolites-organic acids accumulate rapidly in a short period of time. If these organic acids cannot be digested by downstream methanogenic archaea and other microorganisms in time, the fermentation system will be over-acidified, the pH will drop sharply, and the metabolism of most functional microorganisms Inhibited, leading to the collapse of the biogas fermentation system, unable to achieve normal production of biogas

In response to this problem, artificial dosing of alkaline substances can be used to adjust the pH, adding cow dung and other digestible substrates to change the material ratio, etc., but these solutions also have problems such as cumbersome operation and large restrictions on material sources. , in many cases it is not appropriate

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