Method for fast biogas production from kitchen waste

Abstract

The invention relates to a method for rapidly producing biogas from kitchen waste. It solves the technical problems of the prior art such as high cost. The method for rapid biogas production from kitchen waste includes the following steps: A. Pour the kitchen waste into a crusher for crushing treatment; B. Prepare mixed enzymes, dissolve and react amylase, protease and cellulase with water, and the water The temperature is 35-45°C to prepare an enzyme solution; C. Stir and mix the enzyme solution with the crushed kitchen waste, the stirring temperature during the stirring process is 30-45°C, let stand after stirring and mixing, and wait for oil After flotation, the upper oil slick is collected. D. After the slick oil is collected, filter the remaining stirred mixture to obtain the supernatant, and combine the filtered residue with sludge anaerobic fermentation to continue to produce biogas; E. Add the supernatant to the UASB reactor and react through UASB The device is used for methanogenic reaction, that is, methane with a concentration of 55%-65% is produced. The invention has the advantages of low cost.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for rapidly producing biogas from kitchen waste. Background technique [0002] Food waste refers to food residues and wastes generated in catering activities such as households, catering services, or unit meals. my country's food waste is huge, and it has the characteristics of high water content, organic matter content, oil content, salt content, rich nutrient elements, etc., and has great recycling value. Food waste is a resource that has been misplaced. Food waste contains a large amount of organic matter such as starch, plant cellulose, animal fat, protein, etc., such as meat, fish, fruits and vegetables, grains, bones, etc. Effective utilization of resource treatment has great ecological and economic benefits. [0003] At present, domestic and foreign food waste treatment technologies mainly include sanitary landfill, composting, biolo...

AI Technical Summary

Problems solved by technology

[0004] 1. If figure 1 The four stages of methane production by anaerobic fermentation of food waste are shown. The nutrients in food waste usually exist in the form of macromolecules (such as starch and protein), and these macromolecular nutrients need to be hydrolyzed to produce small molecular nutrients ( Such as glucose and amino acids), can be used by microorganisms to ferment methane, and this hydrolysis process is considered to be the rate-limiting step of anaerobic fermentation of food waste to methane, which increases the cost of methane production;

[0005] 2. Unlike liquid organic waste, most of the nutrients in food waste exist in solid form, resulting in low substrate utilization, which in turn leads to low output of methane produced by anaerobic fermentation of food waste;

[0006] 3. Food waste contains a large amount of oil. During the process of anaerobic fermentation to methane, these oils will adhere to the surface of fermenting methane-producing microorganisms, inhibit the activity of methane-producing microorganisms, and reduce the specific surface area in contact between the substrate and microorganisms. Thus affecting the methane production efficiency of the anaerobic fermentation methane production system

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