Marsh gas preparation method of system for preparing marsh gas from domestic garbage

Abstract

The invention relates to the field of environmental protection facilities and equipment, in particular to a marsh gas preparation method of a system for preparing marsh gas from domestic garbage. Themarsh gas preparation method comprises the following steps: pretreating, by a pretreatment apparatus on garbage, storing and transporting the pretreated garbage by virtue of a storage and transportation apparatus, transporting the garbage to a crushing apparatus, crushing the garbage, fermenting the crushed garbage by virtue of a fermentation apparatus, storing the fermented garbage by virtue of astorage apparatus, desulphurizing and dehydrating the stored garbage by virtue of a desulphurization and dehydration apparatus, pressurizing the desulphurized and dehydrated garbage by virtue of a pressurizing apparatus, purifying by virtue of a purifying apparatus, and finally storing the purified marsh gas in a storage tank. By adopting the marsh gas preparation method, the recycling degree ofthe garbage can be maximally increased, the equipment is simple, the garbage is thorough in treatment, the cost is low, the investment return period is short, the energy utilization rate is high, thewaste utilization is realized by preparing the marsh gas from the garbage, the living fuel and electric charge can be saved, and the application prospect is promising.

Description

technical field [0001] The invention belongs to the technical field of garbage treatment, and in particular relates to a method for producing biogas from household garbage. Background technique [0002] my country is the country with the highest output of urban waste in the world. The annual output of urban domestic waste has exceeded 1.114 billion tons, accounting for more than 11 / 14 of the world's total, and it is still growing at a rate of 18-110% every year. The increasingly serious pollution of domestic waste to the urban environment is bound to become a major social problem that the government attaches great importance to and solves. With the changes in urban environmental sanitation and management methods, the management of urban domestic waste in my country is also developing from simple end treatment to source treatment and comprehensive management. In recent years, through national appropriation and local government financing, many landfills have been built in var...

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Problems solved by technology

[0003] The existing technology has the following problems: 1. Due to the variety of domestic waste, the pH cannot be determined. Second, biogas fermentation generally needs to maintain the pH at 17 to 18.15. Direct fermentation without pretreatment will affect the gas production rate; 2. Garbage collection and storage 3. Domestic waste often has a high water content, which affects the crushing effect, and the concentration of the permeate is high, making it difficult to crush when crushing. And it is easy to block the machine and the crushing is insufficient; 4. It is difficult for anaerobic fermentation equipment to control the pH value of the reaction area during the fermentation process, resulting in the rate of anaerobic fermentation not always being kept at the best state; Hydrogen also contains a large amount of dust. Dust entering the desulfurization and dehydration equipment will easily damage the internal parts of the machine and shorten the service life of the machine. Most of the existing biogas biological dehydration and desu

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