Method for producing biogas from fruit and vegetable wastes

Abstract

The invention discloses a method for producing biogas from fruit and vegetable wastes. The method is characterized by comprising the following steps: (1) raw material pretreatment: grinding the fruit and vegetable wastes in a ball grinder to damage the difficultly degraded cellulose structure, releasing the bound water in the raw material and the intracellular water and the intracellular matter in the plant cell, and finally putting the obtained pasty effluent in a storage tank to store; (2) solid-liquid separation and coupling: performing solid-liquid separation on the pasty effluent to obtain a fruit and vegetable juice and a solid residue, wherein the fruit and vegetable juice comprises plenty of soluble carbohydrates (mainly comprising monosaccharide and polysaccharide) and easily biodegradable components for methanation processing; the solid residue is mainly rich in cellulose content; acid liquor containing plenty of volatile organic acids is obtained through a high-solid-concentration hydrolysis acid production reaction, a proper substrate is provided for the methane production process, and then the two-phase anaerobic system has a high gas production performance.

Description

technical field [0001] The invention relates to a method for producing methane from fruit and vegetable waste. Background technique [0002] With the acceleration of the intensive development of planting and the improvement of residents' living standards, a large amount of fruit and vegetable waste is produced, which has a negative impact on the environment and has a negative impact on people's production and life. The biggest feature of this type of waste is its high moisture content and organic matter content. The moisture content is generally above 80%, and the organic matter content is generally above 90% on a dry basis. Currently, the more common treatment technologies mainly include landfill, incineration, and composting. Landfill requires a large amount of land, and the leachate produced will pollute groundwater and soil; incineration requires additional energy input, and produces a large amount of dioxin and dust, which has the problem of secondary pollution; aerobic...

AI Technical Summary

Problems solved by technology

The biggest feature of this type of waste is its high moisture content and organic matter content. The moisture content is generally above 80%, and the organic matter content is generally above 90% on a dry basis. Currently, the more common treatment technologies mainly include landfill, incineration, and composting. Landfill requires a large amount of land, and the leachate produced will pollute groundwater and soil; incineration requires additional energy input, and produces a large amount of dioxin and dust, which has the problem of secondary pollution; aerobic composting requires First reduce the water content of raw materials, and adjust the porosity and nutrient content by adding conditioners, but the effect on the reduction is not very obvious. Therefore, it is urgent to develop a treatment method that is harmless, reduced, and energy-efficient. Fruits and vegetables The high content of organic matter in the waste makes it more suitable for anaerobic digestion, and clean gas fuel (biogas) can be obtained while processing waste

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