Stock garbage screening and reduction treatment system and method

Abstract

The invention discloses a stock garbage screening and reduction treatment system and method. The stock garbage screening and reduction treatment system comprises a gas injection device, a gas extraction device, a methane concentration detection device, an airing system, a crushing device, a screening device, a sorting device, a winnowing device, a magnetic separation device and a leachate collecting device. The gas injection device injects inert gas into a stock garbage heap, meanwhile, the gas extraction device extracts landfill gas in the stock garbage heap, the concentration of methane in the stock garbage heap is reduced, and the excavation safety is improved. The airing system can reduce the water content of stock garbage, and the follow-up screening effect is improved. The treatment method comprises the steps that the stock garbage is aired before being screened, the water content of fed materials is controlled to be 30% or below, and the screening effect is remarkable; and the stock garbage is sequentially subjected to airing, crushing, screening, sorting, winnowing and magnetic separation, the treatment direction of screened products is reasonable, the project production halt risk caused by unsmooth discharging of the screened products is avoided, and meanwhile the problem of secondary pollution in the outward transportation process of the screened products can be avoided.

Description

technical field [0001] The invention relates to the technical field of stock garbage treatment, in particular to a screening and reduction treatment system and method for stock garbage. Background technique [0002] The existing waste screening and reduction treatment system is mainly used in the comprehensive treatment of simple domestic waste landfills. After excavation, the stock waste is transported to the screening and reduction workshop, and then transported to the uniform feeder by the chain plate conveyor. The uniform feeder sends the stock garbage to the magnetic separator, and at the magnetic separator, the iron-containing metals in the stock garbage will be sorted out. After the magnetic separator, the existing garbage is transported to the drum screening machine by a belt conveyor. In the drum screening machine, the existing garbage is divided into two parts, that is, the oversize material (particle size greater than 25mm) and the undersize material (particle siz...

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Problems solved by technology

[0004] 1) There is no pre-stabilization measures to reduce the methane concentration in the existing garbage dump before excavation construction, and there is no real-time monitoring of the methane concentration in the existing garbage dump. There is a greater risk of personnel methane poisoning in the brutal construction

[0005] 2) The excavation of existing garbage is different from general earthwork excavation. Due to the anaerobic fermentation of organic matter in the existing garbage, leachate and methane gas will continue to be produced. If effective pollution control measures are not taken during the excavation process, there will be Serious problems such as cross flow of leachate and overflowing odor have caused the surrounding environment to be polluted, and it is easy to cause resistance from nearby residents

[0006] 3) There is a lot of rainfall in the south, and the moisture content of the stocked garbage is generally greater than 50%. It directly enters the screening equipment without drying. If the moisture content is too high, it will be difficult to achieve the expected screening effect.

[0007] 4) The whereabouts of screening products is not practical. The main humus compost products, light materials (plastic bags, etc.) and medium-density materials (fabric, plastic bottles, glass, etc.) are not sold well. Sub-projects have no suitable outlet for the screened products, which leads to project shutdown and even environmental protection inspections

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