Household refuse incineration ash landfill and anti-scaling treatment method
A technology of domestic waste incineration and treatment method, which is applied in the field of waste disposal derived from domestic waste treatment, can solve problems such as increasing local pipe pressure, reducing leachate delivery volume, threatening the safety of landfill piles, etc., and achieves the effect of reducing leachability
Active Publication Date: 2017-01-04
TONGJI UNIV
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Problems solved by technology
These composition characteristics make it possible for the leachate in the domestic waste incineration ash landfill to precipitate precipitates, which may easily cause fouling of the leachate collection and drainage system, resulting in a reduction in the cross-sectional area of the pipeline and a decrease in the amount of leachate transported, increasing the local pipe pressure. , a serious threat to the safety of the landfill
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Embodiment 1
[0028] The domestic waste landfill rebuilt according to this embodiment is mainly responsible for the sanitary landfill of the slag and stabilized fly ash of the city's domestic waste incineration plant, with a design storage capacity of 36.7×10 4 m 3 , the height of the landfill site is 20m, and the slope of the landfill area is provided with platforms every 8m in height difference, with a slope of 18-20°.
[0029] The slag is sieved into two particle size ranges of greater than and less than 5mm, and the slag with a particle size of >5mm is recycled as a building material after metal recovery. <5mm particle size slag and stabilized fly ash, after mixing with water at L / S=0.25L / kg, they are naturally aged in the landfill for two weeks and then buried. After aging, the pH of the leaching solution of incineration ash remains at Between 8-9. The leachate collection layer 2 is arranged at the bottom of the incineration ash landfill layer 1, the end of the leachate collection pi...
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Abstract
The invention relates to a household refuse incineration ash landfill and an anti-scaling treatment method. The method comprises the steps of 1, conducting aging treatment on flying ash and slag generated from household refuse incineration to obtain aged ash; 2, placing the aged ash in the ash landfill according to a sanitary landfill specification for landfill treatment, and guaranteeing that the water level of a leachate collection well in the ash landfill is always high enough to submerge a pipe orifice of a leachate collection pipe. Compared with the prior art, the method has the advantages that calcium salt capable of being dissolved or is easy to dissolve in incineration ash is converted into calcium salt hard to dissolve through aging pretreatment, so that the calcium concentration in leachate is controlled from the source; besides, by controlling the water level of the leachate collection well, the area of contact between leachate and outside atmosphere is reduced, and then scaling and blocking of a leachate collection and guide drainage system of the household refuse incineration ash landfill are avoided from multiple aspects.
Description
technical field [0001] The invention relates to a waste disposal technology derived from domestic waste treatment, in particular to a domestic waste incineration ash landfill and an anti-scaling treatment method that can prevent fouling of leachate collection and drainage systems. Background technique [0002] With the development of incineration technology in China, municipal solid waste incineration plays an increasingly important role in harmless treatment. According to the data of "China Statistical Yearbook" in 2015, the incineration of municipal solid waste in my country has reached 53 million tons per year, and the proportion of incineration in the harmless treatment of waste is 35%. Due to the limited consumption market for domestic waste incineration ash and recycled materials, there is still a large amount of ash that needs to be landfilled. Chinese invention patent "Method for recovering metals and combustibles from domestic waste incineration slag" (application ...
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IPC IPC(8): E02D31/00
CPCE02D31/006
Inventor 何品晶章骅邵立明吕凡夏溢
Owner TONGJI UNIV