Bio-drying dehydration method and system for household garbage

Abstract

The invention provides a bio-drying dehydration method and system for household garbage. The dehydration system comprises a bio-drying device, a ventilation device and a condensation device, wherein the bio-drying device is used for conducting biological decomposition on organic matter in the garbage under the ventilation condition; the ventilation device communicates with a bio-drying dehydration device and supplies oxygen required for reaction to the bio-drying dehydration device, and heat energy generated in the organic matter biological decomposition process is used for drying and dehydrating the garbage in the bio-drying device; and the condensation device communicates with a drying dehydration device and used for condensing gas generated during drying and carrying harmful impurities into liquid similar to leachate and spraying part of the leachate back to the drying dehydration device to regulate the humidity of the bio-drying dehydration system. By means of the bio-drying dehydration method and system, the heat value of the garbage is increased, carbon emission and secondary pollution in the subsequent processing process are reduced, meanwhile, the operation cost of subsequent processing is reduced, and reduction, harmless treatment and resource utilization of the household garbage are achieved.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method and system for biologically drying and dehydrating domestic garbage. Background technique [0002] With the rapid development of urbanization in our country, the amount of garbage in cities is increasing. This huge growth trend has had a huge impact on society, economy and ecology. In the past two years, cities have been besieged by garbage in various places, and the problem of garbage disposal has become an important problem that governments at all levels must face and urgently need to solve. [0003] At present, there are three main ways of domestic waste disposal in my country. [0004] 1. Landfill: Landfill is the most important way of domestic waste disposal in my country at present, but this method has very big disadvantages. First, it takes up a lot of land resources; second, it seriously pollutes the environment, groundwater and soil, and it is irreversib...

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Problems solved by technology

[0004] 1. Landfill: Landfill is the most important way of domestic waste disposal in my country at present, but this method has very big disadvantages. First, it takes up a lot of land resources; second, it seriously pollutes the environment, groundwater and soil, and it is irreversible; The landfill gas is discharged in an orderly manner, and the stench is unpleasant, which seriously affects the health of the surrounding residents. Fourth, the garbage cannot be disposed of properly, and the garbage is often moved helplessly due to the expansion of the city.

[0005] 2. Composting: Domestic waste is used for composting in some areas of my country. However, due to the limitation of composting technology and people's weak understanding of composting production, they have a prejudice against the production of fertilizer from waste, so there is no way to treat waste by composting in China. developed extensively

However, due to the characteristics of high water content and low calorific value of domestic waste, full incineration will lead to unstable combustion, and harmful gases will be produced when the combustion temperature is low, which will cause secondary pollution.

In addition, waste incineration also has a scale effect. Small-scale waste incineration has low resource efficiency, which is not only a waste of resources, but also increases unit investment costs, resulting in increased operating costs.

[0007] Due to the characteristics of high water content, high organic matter content, and low calorific value of domestic waste in my country, direct landfill or composting will produce a large amount of leachate and greenhouse gases, and the disorderly discharge of pollutants will lead to secondary pollution; while direct incineration of domestic waste is due to characteristics, it will lead to insufficient combustion, low system efficiency, and sometimes excessive pollutant emissions

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