Domestic waste biological treatment method

Abstract

A domestic waste biological treatment method adopts biological dry anaerobic fermentation for producing biogas, and is as follows: large impurities, combustible materials and ferromagnetic metals are sorted form waste, 90-110m<3> of biogas can be produced from the sorted organic waste per cubic meter by biological dry anaerobic fermentation, leachate circulation and spray inoculation of anaerobic bacteria and humidifying, the biogas can be purified and compressed to be used as a vehicle fuel and household energy, large impurities and light combustible materials can be further screened from the biogas slag by entire membrane covering and biological aerobic drying, the screened combustible materials can be used as a winter fermentation tank heating fuel, the biogas slag can be used as a compounding fertilizer raw material and an organic fertilizer for application; biogas productivity is high, hydrogen sulfide content in the biogas is low, no biogas slurry is discharged, the method is free of secondary pollution, the fertilizer efficiency is fully retained in the biogas slag, the fertilizer efficiency is high, equipment is simple, low investment and operating cost are low, land occupation is less, processing capacity is large, and the method is easy to implement and promote.

Description

technical field [0001] The invention relates to a domestic garbage treatment method, in particular to a biological dry anaerobic fermentation harmless treatment and resource utilization treatment method. It belongs to the field of energy and environmental protection. Background technique [0002] At present, my country is already the country with the heaviest garbage burden in the world. The annual output of garbage in 668 cities in the country alone has reached 180 million tons, and it is growing at a rate of 8% every year. China's garbage has accounted for more than 1 / 4 of the world's annual output of garbage. Almost all cities in the country are surrounded by garbage. "The Twelfth Five-Year Plan for the Construction of Harmless Treatment Facilities for Urban Household Garbage" (Guobanfa [2012] No. 23). It is pointed out in the article that urban domestic garbage disposal is an important part of urban management and environmental protection, an important symbol of socia...

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Problems solved by technology

[0007] 2. It occupies a large area. Due to the limited capacity, the landfill is generally used for a short period of 5-10 years. It takes a long time and cannot be reused within 100 years. The data shows that more than 800,000 mu of land has been occupied by garbage in the country, and the economic loss is as high as 35. 100 million yuan

[0008] 3. Waste landfills cause waste of resources, and each ton of domestic waste can produce 90-110m3 of biogas

Incineration for power generation requires oil injection or mixed combustion with coal, which increases operating costs and becomes a financial burden. A considerable number of waste incineration power plants are forced to stop running after commissioning and commissioning

[0012] 2. my country's waste incineration power generation accounts for only 19.6% of the waste (including incineration). The main reason is that the investment in project construction is large. The investment in waste incineration power plants is more than 100 million yuan per 100 tons of waste treatment, mainly relying o

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