Municipal waste harmless recycling method with sewage cyclic utilization

Abstract

The invention relates to a municipal waste harmless recycling method with sewage cyclic utilization. Municipal waste is sorted into waste raw materials and preparation raw materials of waste derived fuel in manual sorting, magnetic sorting and mechanical sorting modes, then the preparation raw materials of the waste derived fuel obtained in the previous process are prepared into the waste derivedfuel, additionally, the raw materials are mixed with clay, limestone and iron powder and are crushed so as to be calcined in a rotary kiln to prepare raw materials for building materials, fly ash andsmoke which are generated by calcination of the rotary kiln are treated in dedusting and chemical reaction modes, and finally, denitrification, nitrification, ultrafiltration and reverse osmosis treatment are performed on sewage, so that the waste cleaning water is purified. The municipal waste is converted into the raw materials for the building materials, the municipal waste can be recycled, sothat the use rate of the municipal waste is greatly increased, and the sewage generated in a waste treatment process can be purified and reused, so that water resources are saved.

Description

technical field [0001] The invention relates to a method for treating urban garbage, in particular to a method for harmless and resourceful urban garbage with recycling of sewage. Background technique [0002] With the development of urban construction and the increase of population, the expansion of urban functions and the improvement of residents' living standards, the generation and accumulation of urban garbage have risen sharply. According to the statistics of China Urban Environmental Sanitation Association, my country produces nearly 1 billion tons of garbage every year. Among them, domestic waste is about 400 million tons, and construction waste is about 500 million tons. In addition, there are about 10 million tons of kitchen waste. The total amount of garbage in my country is one of the best in the world; With the improvement of living standards, urban domestic garbage is still increasing at a rate of about 5%-8% per year, and the hazard of garbage has become a serio...

AI Technical Summary

Problems solved by technology

[0005] 1. The "landfill method" is relatively easy to operate, but there are problems such as occupying a large amount of land resources, generating secondary pollution and potential dangers, huge investment, and limited service life, and a large amount of recyclable resources are lost

[0006] 2. The "pyrolysis method" can control harmful gas emissions, but there are still problems of large landfill volume and secondary pollution, and the investment is also a lot

[0007] 3. The "composting treatment method" is conducive to the utilization of organic matter in garbage, but it has strict requirements on the composition of the garbage to be processed, and the harmful components such as heavy metals in the garbage will pollute the soil and groundwater, thus entering the food chain of urban and rural residents, and its residues Handling and control of germs and viruses are also very tricky

[0008] 4. The "incineration method" is an important treatment method for urban waste reduction, and it is also one of the main methods that have been or are being implemented in many cities in my country; however, waste incineration equipment requires large investment and high operating costs, especially during the incineration process. Harmful gases such as hydrogen chloride, nitrogen oxides, sulfur oxides, and highly toxic dioxins are produced; moreover, there are about 10% of the original garbage weight ashes that must be landfilled again or specially treated as hazardous waste

Images