Life refuse treating process

Abstract

A process for treating life garbage includes such steps as breaking, sorting them by wind separation and magnetic separating to obtain inorganic substance, organic garbage and waste plastics, using inorganic substance to prepare building material, treating the waste plastics by the plastics-treating system, hydrolyzing and dewatering the organic garbage and then spray drying, and further sorting to obtain inorganic substance used to prepare building material, organic substance used to prepare fertilizer and waste plastics treated by said plastic treating system.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, in particular to a process for treating urban domestic garbage, which is suitable for treating mixed domestic garbage not collected according to classification. Background technique [0002] With the increasing awareness of global environmental protection, my country's municipal solid waste treatment has gone through a development process from bare garbage→simple landfill→simple composting→high temperature composting→sanitary landfill and incineration→recycling treatment. The municipal solid waste in our country is different from developed countries. The output and density of domestic solid waste are high, there are not many combustible materials such as paper, and the water content is as high as 40-60%. The municipal solid waste is not classified and collected as mixed waste. Foreign waste treatment technologies and equipment are not suitable for treating China's municipal solid waste becaus...

AI Technical Summary

Problems solved by technology

This garbage treatment process has the following disadvantages: 1) sorting adopts manual roughing and magnetic separation, which is labor-intensive and there are more bacteria in the garbage, which has a certain impact on the health of operators; 2) the sorting effect is poor, Sorting only removes scrap metal and waste batteries, as well as hard objects, sundries and foam plastics with a diameter or length greater than 50mm, while hard objects, sundries and foam plastics with a diameter or length less than 50mm cannot be separated from organic matter. During the pyrolysis process, a relatively large amount of organic matter will be wrapped by the reduced waste plastic (diameter or length less than 50mm), which is not conducive to re-screening, and the utilization rate of organic matter is low; 3) The pyrolysis process needs to treat organic matter, inorganic matter and Waste plastics are treated with three substances, which increases the load of pyrolysis, and needs to add an acidic catalyst with a concentration of 5%, which results in high operating costs; 4) There are a large amount of waste plastics in the inorganic matter sent to the building materials system, and the waste plastics are wrapped Organic matter, due to the characteristics of waste plastics and organic materials, is not suitable for making building materials, so a large amount of special modifiers, coagulants and other raw materials need to be added in the process of making materials, the production cost is high and the made building materials are difficult Reach the national standard; 5) The wastewater obtained by dehydration has not been treated, and its acid value is relatively high. If it is discharged naturally, it will cause secondary pollution to the environment

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