Domestic waste treatment method

Abstract

The invention discloses a domestic waste treatment method. The domestic waste treatment method comprises the steps that waste is sorted, wherein after waste raw materials are sequentially subjected torough sorting, hydraulic crushing, magnetic separation, roller screening, winnowing, intermediate crushing, bouncing circulation sorting and vortex metal sorting, the to-be-treated waste with the organic matter content reaching a threshold is sorted; the to-be-treated waste is shredded into refined waste with the length of 25-35 mm; the refined waste is mixed with sludge to obtain a waste and sludge mixture; the waste and sludge mixture is sequentially dried and carbonized so as to obtain waste biomass synthetic carbon; gas generated in the drying and carbonizing processes is separated, and combustible gas and waste gas are obtained; and the waste gas is sent to a microorganism filter bed combined deodorization system for purification, and the purified waste gas is subjected to ultraviolet photolysis, activated carbon adsorption and emission. According to the method, the pollution to the environment in the domestic waste treatment process can be reduced, and the method has the advantages of being free of secondary pollution, environmentally friendly, high in efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of domestic waste treatment, in particular to a domestic waste treatment method. Background technique [0002] With the continuous deepening of urbanization, garbage, as a product of urban metabolism, has become a burden on urban development. At the same time, environmental issues have gradually been paid attention to. Energy conservation and environmental protection have become the development themes of various countries, which provides extensive opportunities for industrial development for garbage disposal. The average annual growth rate of garbage in the world is 8.42%, while the growth rate of garbage in China has reached more than 10%. The world produces 490 million tons of waste every year, and China alone produces nearly 150 million tons of municipal waste every year. The cumulative stock of domestic waste in China has reached 7 billion tons. However, with the advancement of science and technology, ...

AI Technical Summary

Problems solved by technology

[0004] First, garbage landfills are subject to large regional restrictions. It is often necessary to transport garbage to suburbs far away from the city for treatment, and the garbage landfill has not been treated harmlessly, leaving a large number of bacteria, viruses, and latent methane, Heavy metals and other pollution. In addition, the seepage water, methane and stench produced by landfill will cause serious pollution to water, soil and atmosphere.

Second, waste incineration is to thermally decompose, burn, melt, etc. the waste, so that the waste is oxidized at high temperature to reduce its volume and become residue or molten solid matter. However, the one-time investment of the incineration method is large and the investment recovery period is long. ; The incinerator needs frequent maintenance, the equipment maintenance cost is high, and the equipment life is short. The tail gas incinerated contains a large amount of particulate matter, SO X , NO X , heavy metals, dioxins and other pollutants; due to no sorting process, complete mixed incineration, the residue contains a large amount of heavy metals and cannot be disposed of harmlessly; a large amount of sulfur-containing gypsum ore and heavy metal carbon residues need to be landfilled, resulting in secondary land pollution problems, affecting the environment and endangering people's health

Third, waste composting is to decompose and decompose the organic matter in domestic waste under artificial control conditions through the biochemical action of microorganisms, so as to convert it into stable humus soil, but this method requires a long fermentation period and a large area; Sulfate ions left in the composting process will compact the soil and pollute the land; the volatile gases produced during the fermentation will pollute the atmosphere; the inherent contradiction between the continuity of domestic waste treatment and the seasonality of composting product sales; resulting in composting words The volume reduction effect is poor, and the scope of application is small, which leads to high composting costs or poor quality, which affects the sales of composting products

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