Method for resource recovery and classification utilization of urban domestic waste

Abstract

The invention discloses a method for resource recovery and classification utilization of urban domestic wastes, which at least comprises the following steps of: a magnetic separation step, a waste cutting step, a elutriation flotation step, a waste extrusion dehydration step, an anaerobic treatment step and a sludge deposition concentration step; scrap iron is separated by the magnetic separationstep for the recovery and utilization of the scrap iron; anaerobic organic matter is crushed by the waste cutting step; pasty organic matter and block non-anaerobic wastes are thoroughly separated bythe elutriation flotation step so as to allow the pasty anaerobic organic matter to enter a biogas generation pool or tank for an anaerobic reaction and to allow the clean non-anaerobic wastes to be extruded, dehydrated and dried for individual treatment, and the waste decrement is above 90%; after elutriation, the left 10% non-anaerobic wastes are prepared into fuel oil by a cracking reaction; or are recycled through screening with no screening difficulty being caused by dust and organic matter containing in the wastes; or are delivered into a gasifier for fuel gas production, which preventsthe energy consumption of water-containing organic matter during waste incineration treatment, and greatly increases the thermal efficiency of waste treatment.

Description

technical field [0001] The invention relates to a method for classifying garbage and utilizing the garbage as resources to eliminate urban domestic garbage. Background technique [0002] The biggest problem in garbage disposal is that the components of garbage are complex, and the characteristics of each component are very different, resulting in an increasing accumulation of garbage, which has become a serious obstacle to the development of human society. [0003] The landfill method is the most used and passive method of garbage disposal. The disadvantages are that it occupies a large area, is harmless, and has a low degree of volume reduction. There is a potential threat of secondary pollution, and all the resources in the garbage are wasted. [0004] Incineration is also an important method to deal with garbage. The advantage of incineration treatment is that the reduction effect is good, the volume of the residue after incineration is reduced by more than 90%, the weig...

AI Technical Summary

Problems solved by technology

The disadvantage is that it destroys resources. Garbage contains about 70% of water. Hydrogenous organic matter consumes energy, and combustible garbage releases energy. During the incineration process, the energy consumed and the released energy are offset, and the remaining energy is little or negative. Therefore, there are requirements for the calorific value of garbage. , incineration consumes coal, oil and other combustion-supporting energy, wasting a lot of recyclable resources

[0005] Anaerobic fermentation method is an effective method to deal with municipal solid waste, which can recycle the energy in domestic solid waste, but its disadvantage is that the anaerobically decomposable waste is large in size and easy to be wrapped in plastic, resulting in long fermentation time, incomplete anaerobic reaction, and Non-anaerobically decomposable garbage such as waste plastics and waste metals cannot be recycled, making it extremely difficult to popularize and apply this method

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