Water processing device and method for household garbage incineration fly ash

Abstract

The invention discloses a water processing device and method for household garbage incineration fly ash. Fly ash in a countercurrent washer reversely flows upwards and is pushed and countercurrent contact washing is performed on the fly ash and water flow flowing downwards, a dehydration device dehydrates the washed fly ash, and then the fly ash is conveyed through a conveying device to a cement kiln system on a cement production line to be disposed and utilized. The countercurrent contact mode is adopted, sufficient multi-stage washing is performed on the fly ash and the water in the continuous countercurrent washer, soluble salt wrapped by the fly ash can be diffused and dissolved in the process on the condition that the certain concentration difference is kept, and the content of chlorine salt remaining in the washed and dehydrated fly ash meets the coprocessing requirement of a cement kiln; coagulation sedimentation, sand filtration and film filtration are performed on washing outflow water with the high salt content for further removing the remaining micro quantity of hazardous particles, and the quality requirement for standard sea drainage or bittern salt manufacturing is met.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment and disposal, in particular to a water washing treatment device and method for domestic waste incineration fly ash. Background technique [0002] With the continuous improvement of the degree of urbanization, the amount of domestic urban waste is also increasing year by year. Due to the many defects of the traditional sanitary landfill method, more and more cities adopt the incineration method. However, a certain amount of fly ash will be produced in the process of waste incineration, which is enriched with soluble salts, heavy metals (Cd, Pb, Zn and Cu, etc.) and trace amounts of dioxins, furans, etc. -100 times, the "National List of Hazardous Wastes" has listed waste incineration fly ash as hazardous waste (numbered HW18) for management. Due to the large amount of fly ash produced by waste incineration, it is obviously uneconomical to use the usual hazardous waste disposal method...

AI Technical Summary

Problems solved by technology

[0004] Chinese invention patent ZL201010162532.7 disclosed on September 1, 2010 a method for the co-processing of domestic waste incineration fly ash in cement kilns, through intermittent three-stage or single-stage water washing pretreatment of fly ash and co-processing technology in cement kilns Among them, the three-stage water washing process has achieved good results in engineering applications, but at the same time it also exposed problems such as long process flow, large equipment investment, residual chlorine in fly ash after washing, and high operating costs.

Images