Method for comprehensively treating municipal solid waste

Abstract

The invention relates to a method for comprehensively treating municipal solid waste. The method comprises mechanical treatment steps of manual sorting, bag breaking, magnetic separation, screening with a roller, winnowing and pulpifying and biological treatment steps of anaerobic digestion and aerobic composting. By combining all the steps for use, different components in the municipal solid waste are classified according to physicochemical properties of the components and then are treated; magnetic metal, plastic paper and the like which are obtained through sorting are recycled; organic waste obtained through sorting is crushed and pulpified and then is subjected to anaerobic digestion so as to produce methane; sludge is subjected to aerobic composting so as to produce organic fertilizer; the residual inorganic substances which cannot be treated or recycled can be subjected to sanitary landfill; and odor which is produced in the waste treatment process is treated in a centralized way, and then is discharged after reaching the standard. The method has great significance for treating the increasing municipal solid waste.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for comprehensive treatment of municipal solid waste. Background technique [0002] With the acceleration of urbanization, the amount of municipal solid waste is increasing day by day. Municipal solid waste is mainly disposed of by sanitary landfill and incineration. The organic matter in municipal solid waste is about 60%, the recyclable matter is about 8%, and the moisture content is as high as 40%. Although sanitary landfill can effectively prevent secondary pollution caused by simple landfill, it needs to occupy a large amount of land resources, causing waste of recyclables, and the disposal cost of landfill leachate is relatively high. The degree of reduction and harmlessness of waste incineration is relatively high, but the calorific value of waste is required to be greater than 3344kJ / kg, otherwise it cannot meet the conditions of its own stable...

AI Technical Summary

Problems solved by technology

Although sanitary landfill can effectively prevent secondary pollution caused by simple landfill, it needs to occupy a large amount of land resources, causing waste of recyclables, and the disposal cost of landfill leachate is relatively high

The reduction and harmlessness of waste incineration are relatively high, but the calorific value of waste is required to be greater than 3344kJ / kg, otherwise the conditions for stable combustion cannot be met, and a certain amount of fuel needs to be added

In my country, urban domestic waste is generally collected in a mixed manner. The high moisture content leads to its low calorific value, and most of them are not suitable for direct incineration treatment, and the dioxin produced seriously pollutes the atmospheric environment.