Municipal waste harmless resourceful treatment system with sewage cyclic utilization function

Abstract

The invention relates to a municipal waste harmless resourceful treatment system with a sewage cyclic utilization function. The system comprises a pretreatment system, a waste treatment system, an aftertreatment system and a sewage purifying system, wherein waste raw materials and preparation raw materials of waste derive fuel are separated from municipal waste through the pretreatment system; thewaste treatment system prepares the preparation raw materials, obtained in the pretreatment system, of the waste derive fuel into the waste derive fuel, mixes the waste raw materials, clay, limestoneand iron powder, crushes the mixture, and burns the mixture through a rotary kiln to prepare building raw materials; the aftertreatment system treats fly ash generated by burning in the rotary kiln in a dust removing and chemical reaction mode; and the sewage purifying system purifies the sewage generated in the washing and separating process to achieve water cyclic utilization of the whole system. By the adoption of the system, the municipal waste is converted into the building raw materials, the municipal waste can be subjected to resourceful utilization, the sewage generated in the waste treatment process can be purified and reused, and utilization of water resources is saved.

Description

technical field [0001] The invention relates to an urban garbage treatment system, in particular to an urban garbage harmless and resourceful treatment system with sewage recycling. 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 ser...

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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

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