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Cooperative treatment method for refuse incineration fly ash and refuse leachate

A technology for waste incineration fly ash and landfill leachate, applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problem of polluted soil and surface water sources, unsatisfactory disposal effect, and low treatment stability and other problems, to achieve the effect of simple processing equipment, low processing cost, and reduced leaching toxicity

Inactive Publication Date: 2017-02-15
北京首创北科环境科技研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water quality of landfill leachate is quite complex, generally containing high concentrations of organic matter, heavy metal salts, and ammonia nitrogen. Landfill leachate not only pollutes soil and surface water sources, but also pollutes groundwater. There have been many studies on the removal of COD and ammonia nitrogen in landfill leachate , the biological method is generally used for disposal, but the disposal effect is not ideal, and the operating cost is relatively high
[0010] Under normal circumstances, these two types of waste are treated separately, so the treatment cost is high and the treatment stability is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this example, the fly ash was added to the water according to the solid-liquid mass ratio of 1:6, stirred at a speed of 2000r / min for 20min, and then solid-liquid separation was performed on a centrifuge, and the number of times of washing with water was 3 times. The washing rate can reach 99%. After that, add inorganic oxides to the fly ash after washing. The oxides are calcium oxide and silicon oxide. The amount added is 5% of the fly ash mass. Mix, set the temperature of the reactor to 250°C, and treat in the reactor for 3h.

[0043] After treatment, the fly ash dioxins can be reduced by more than 96.66%, Mn, Ni, Cu, Zn, Cd, Pb and other heavy metals, and the treatment efficiency is 96.35%, 97.56%, 96.25%, 98.59%, 97.22%, 96.81%. , the treatment efficiency has reached more than 96%, showing an excellent treatment effect.

Embodiment 2

[0045] In this example, fly ash was added to water at a solid-to-liquid mass ratio of 1:4, stirred at a speed of 2000r / min for 20 minutes, and then solid-liquid separation was performed on a centrifuge. The washing rate can reach 93%. After that, add inorganic oxides to the fly ash after washing. The oxides are calcium oxide and silicon oxide. The amount added is 3% of the fly ash mass. The solid mixture and landfill leachate are mixed in a solid-liquid ratio of 1:4. , the temperature of the reactor was set to 300°C, and the reactor was treated for 3h.

[0046] After treatment, the reduction of fly ash dioxin is more than 98.12%, and the treatment efficiency of Mn, Ni, Cu, Zn, Cd, Pb and other heavy metals is 97.12%, 97.35%, 97.25%, 97.86%, 97.28%, 98.16% respectively , the treatment efficiency has reached more than 97%, showing an excellent treatment effect.

Embodiment 3

[0048] In this example, the fly ash was added to the water according to the solid-liquid mass ratio of 1:8, stirred at a speed of 2000r / min for 20min, and then the solid-liquid separation was carried out on the centrifuge, and the number of water washings was 2 times. The washing rate can reach 98%. Afterwards, add inorganic oxides to the washed fly ash, the oxides are calcium oxide and silicon oxide, the amount added is 4% of the fly ash mass, and the solid mixture and landfill leachate are mixed at a solid-liquid ratio of 1:15 , the temperature of the reactor was set to 275°C, and the reactor was treated for 5h.

[0049] After treatment, the fly ash dioxins can be reduced by more than 98.50%, Mn, Ni, Cu, Zn, Cd, Pb and other heavy metals, and the treatment efficiency is 98.62%, 97.12%, 98.10%, 98.02%, 97.22%, 98.16% respectively , the treatment efficiency has reached more than 97%, showing an excellent treatment effect.

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Abstract

The invention relates to a cooperative treatment method for refuse incineration fly ash and refuse leachate. According to the cooperative treatment method for the refuse incineration fly ash and the refuse leachate, a solvent which has quite high oxidation performance in the subcritical state or the critical state is used for simultaneous treatment of dioxin in the fly ash, the flay ash and heavy metal and organic pollutants in the refuse leachate. Under the alkaline hydrothermal condition, carbon, aluminum and silicon matter in the refuse incineration fly ash can easily synthesize a zeolite-like structure, so that a large amount of heavy metal in the fly ash is adsorbed into pores of the zeolite-like structure, and therefore the leaching toxicity of the heavy metal in the fly ash is lowered. Under the hydrothermal condition, along with continuous rising of the temperature and the pressure in a sealed reactor, the water solubility of the dioxin is greatly improved, the reactivity is improved beneficially, and oxidation and decomposition of the dioxin are accelerated.

Description

technical field [0001] The invention relates to a method for processing waste incineration fly ash and landfill leachate, in particular to a method for cooperating with waste incineration fly ash and landfill leachate, especially a method for synergistically treating dioxin and landfill leachate in waste incineration fly ash Methods for heavy metals, organic pollutants and heavy metals in landfill leachate. Background technique [0002] Waste incineration fly ash is the material collected in the heat recovery system and flue gas purification system after waste incineration. It mainly comes from the bottom ash produced by the waste heat boiler, the bottom ash produced by the reaction tower and the dust collected by the bag filter. It contains a large amount of highly toxic pollutants such as heavy metals and dioxins, and belongs to the hazardous waste (number: HW18) stipulated by the state and must be disposed of safely. [0003] The important characteristics of fly ash and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C02F1/72C02F1/28C02F103/06C02F101/30C02F101/20
CPCB09B3/00C02F1/281C02F1/72C02F2101/20C02F2101/30C02F2103/06
Inventor 郑向军解刚王薇张平敏朱贵徽陆嘉
Owner 北京首创北科环境科技研究院有限公司
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