System and method for innocent treatment of garbage flying ash

A technology of harmless treatment and garbage fly ash, which is applied in the field of hazardous waste treatment and disposal, can solve the problems that the diffusion of dioxin cannot be avoided, and the leaching of heavy metals cannot be guaranteed to meet the standards, so as to improve the quality of fly ash, avoid release, and improve the quality of materials. quality effect

Active Publication Date: 2008-09-03
EVERBRIGHT ENVIRONMENTAL PROTECTION TECHCAL DEV BEIJING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent application with the publication number CN1947872A discloses a washing pretreatment method for fly ash, which can remove most of the chloride ions in the fly ash, but the large amount of wastewater generated by this process needs to be retreated by carbonization-flocculation before it can be discharged. Fly ash cannot guarantee the leaching of heavy metals, nor can it prevent the diffusion of dioxins into the environment

Method used

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  • System and method for innocent treatment of garbage flying ash
  • System and method for innocent treatment of garbage flying ash

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] The fly ash collected by a grate type garbage incinerator filter bag dust collector, the content of some heavy metals, chlorine and alkali metals are shown in Table 1:

[0035] Table 1 Contents of some heavy metals, chlorine and alkali metals in the fly ash of an incinerator

[0036] Element type

[0037] The fly ash shown in Table 1, with 4.5% FeSO 4The solution is fully mixed with the fly ash in the reaction device 1 according to the liquid-solid ratio = 1.5: 1, and after being stirred evenly (the corresponding iron / ash mass ratio is 1: 40), a mixture in a liquid-solid state is formed, and then sulfuric acid or titanium dioxide waste is used to The acid adjusts the pH value of the system to 11 ± 0.15; the above-mentioned mixture is sent to the vacuum filtration equipment 2 for liquid-solid separation; the waste liquid after the suction filtration is pumped into the spray hot air drying tower 6 for spray evaporation ( Close the pipeline that vacuum filtratio...

example 2

[0039] For the fly ash shown in Table 1, the middle water is fully mixed with the fly ash in the reaction device 1 according to the liquid-solid ratio=3.5: 1, and 300kg of ferrous sulfate heptahydrate is added to each ton of fly ash simultaneously (the corresponding iron / ash mass ratio is 1:16.7), and then stirred until the pH value of the system naturally rose to 10, the ash-water mixture was sent to the filter press 2 for liquid-solid separation, and the separated waste liquid was sent to the multi-effect evaporator 6 for evaporation and recovery of salt (this Close the pipeline that filter press equipment 2 is connected with reaction device 1 when closing). After the press filtration is basically completed, reclaimed water 1.5 times the mass of the original fly ash is sent through the flushing device 7, and the ash cake is washed in the filter press equipment 2, and the separated waste water is sent to the front-end reaction device 1 for use with the fly ash. Ash mixed trea...

example 3

[0041] The content of some heavy metals, chlorine and alkali metals in the fly ash collected by a grate type garbage incinerator filter bag filter is shown in Table 2:

[0042] Table 2 Contents of some heavy metals, chlorine and alkali metals in the fly ash of an incinerator

[0043] Element type

Pb

mg / kg

Cr

Mg / kg

Cd

mg / kg

Zn

mg / kg

Cl

g / kg

CaO

g / kg

Na 2 o

g / kg

K 2 o

g / kg

content

1395

134.9

91

3175

129

221

34.3

38.7

[0044] The unpurified ferrous nitrate solution is mixed and stirred with the fly ash in the reaction device 1 according to the mass ratio of iron / fly ash=1:90, and the liquid-solid ratio is 1.8:1; The pH value of the fly ash is adjusted to 10.5 ± 0.15, and then the fly ash-water solution is sent to the vacuum filtration equipment 2 for liquid and solid separation, and the separated liquid is sent to the spray...

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Abstract

The invention discloses a refuse flying ash innocent treatment system comprising a reaction device for solidifying the flying ash, a liquid-solid separating device connected with the reaction device through a conduit, a flushing device connected with the liquid-solid separating device, and a pressing device connected with the liquid-solid separating device through a belt transfer device; a sunning field and an incinerator are also comprised, and the pressing device, the sunning field and the incinerator are connected by a transporting device. The invention also discloses a refuse flying ash innocent treatment method. Chlorine ions and base metal in the flying ash are removed effectively and the heavy metal is stabilized by using the inventive treatment system and method. Solidified flying ash is burned in the incinerator after press molded, dioxins is removed and the flying ash is sufficiently innocent to facilitate final treatment in next step and resource utilization.

Description

technical field [0001] The invention relates to the technical field of hazardous waste treatment and disposal, in particular to a process system and method capable of harmlessly treating the fly ash of garbage incineration containing heavy metals and dioxins. Background technique [0002] Garbage incineration is an important means of disposal of municipal solid waste. In the commonly used grate furnace incineration process, the incineration process will produce fly ash which is about 2-5% of the mass of the waste in the furnace, and fluidized bed incineration will produce more fly ash. Fly ash from waste incineration should be treated as hazardous waste because it contains a relatively high concentration of heavy metals and a certain concentration of dioxins, and should not enter the landfill without special treatment. The chlorine and alkali metal elements contained in the fly ash increase the difficulty of recycling, and the chlorine and alkali metal elements contained in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/00A62D3/40A62D101/20A62D101/43
Inventor 陈德珍张云月罗智宇张清马莉
Owner EVERBRIGHT ENVIRONMENTAL PROTECTION TECHCAL DEV BEIJING
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