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Method for stabilizing fly ash of municipal solid waste incinerator by using artificial sea water

A technology of domestic waste incineration and artificial seawater, which is applied to the removal of solid waste, can solve the problem of high cost, and achieve the effect of simple operation and low treatment cost

Inactive Publication Date: 2012-11-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the present invention is to propose a new agent for stabilizing heavy metals in fly ash, and to use the agent to treat fly ash with low cost, aiming at the problems of insufficient technology and high cost of the existing domestic waste incineration fly ash heavy metal stabilizing agent. The process is simple, the effect is stable, the source of raw materials is extensive, and it will not cause secondary pollution to the environment

Method used

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  • Method for stabilizing fly ash of municipal solid waste incinerator by using artificial sea water
  • Method for stabilizing fly ash of municipal solid waste incinerator by using artificial sea water
  • Method for stabilizing fly ash of municipal solid waste incinerator by using artificial sea water

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Embodiment 1

[0027] Take 100g of the above fly ash as a sample, take 100ml of the above stabilizer (artificial seawater), add the stabilizer to the fly ash, stir for 10 minutes, make the stabilizer solution and the fly ash mix fully, forming a thick mortar material, heavy metals in the fly ash The ions react with the stabilizer solution completely, and then the above mixture is dried under natural ventilation, and then it can be landfilled in a hazardous waste landfill. According to the hazardous waste identification standard (GB5086.2-1997), the treated fly ash was subjected to toxicity leaching test. The results are as follows figure 2 Shown: show that the leaching concentration of lead (lead=14.23mg / L) exceeding the standard is 0.21mg / L, the rest, the concentration of zinc is 0.10mg / L, the concentration of chromium is 0.03mg / L, cadmium, nickel, copper None of them have been detected, reaching the pollution control standard for hazardous waste landfills (GB18598-2001).

Embodiment 2

[0029] Take 100g of fly ash sample, 50ml of stabilizer, fly ash and stabilizer are the same as in Example 1. Add the stabilizer to the fly ash and stir for 20 minutes to mix the stabilizer and the fly ash fully to form a thick substance. The heavy metal ions in the fly ash react with the stabilizer solution completely, and then the above mixture is dried under natural ventilation. Then it can enter the hazardous waste landfill. According to the hazardous waste identification standard (GB5086.2-1997), the treated fly ash was subjected to a toxicity leaching test. The results showed that the leaching concentration of lead element exceeding the standard was 0.15mg / L, and the concentration of zinc was 0.06mg / L. The concentration of chromium is 0.035mg / L, cadmium, nickel, and copper are not detected, which meets the pollution control standard for hazardous waste landfills (GB18598-2001). Such as image 3 Shown.

Embodiment 3

[0031] Take 100g of fly ash sample and 25ml of stabilizer. Add stabilizer to fly ash and stir for 30 minutes to make the stabilizer and fly ash mix fully to form a thick substance. The heavy metal ions in the fly ash react with the stabilizer solution completely, and then The above-mentioned mixture is dried under natural ventilation, and then it can be landfilled in a hazardous waste landfill. According to the hazardous waste identification standard (GB5086.2-1997), a toxicity leaching test was carried out on the treated fly ash. The results showed that the leaching concentration of lead element exceeding the standard was 0.29mg / L, and the concentration of zinc was 0.045mg / L. The concentration of chromium is 0.08mg / L, cadmium, nickel, and copper are not detected, which meets the pollution control standard for hazardous waste landfills (GB18598-2001). Such as Figure 4 Shown.

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Abstract

The invention provides a method for stabilizing fly ash of a municipal solid waste incinerator by using artificial sea water, and relates to a process for stabilizing heavy metals in the fly ash of the municipal solid waste incinerator. The method comprises the following steps of: weighing the fly ash and sea salt in a mass ratio of 1:0.01-0.5; weighing distilled water and the sea salt in the mass ratio of 30 to 1; dissolving the sea salt into the distilled water to make the artificial sea water; adding the fly ash into the artificial sea water; stirring for 10 to 30min to generate heavy mortar mixture; drying and maintaining the heavy mortar mixture for 2 to 3 days under a natural ventilating condition, and detecting that immersion of the heavy metals in the mixture meets the safe landfill requirement of 'Identification Standards for Hazardous Wastes-Identification for Extraction Toxicity' (GB5085.3-2007). The invention has the advantages of readily available raw materials and low cost, and cannot generate secondary pollution to the environment.

Description

Technical field [0001] The invention relates to a method for stabilizing heavy metals in fly ash of a domestic garbage incineration plant. It belongs to the technical field of stabilization treatment of hazardous waste in environmental engineering. technical background [0002] With the rapid development of my country’s economy, the rapid improvement of people’s living standards, and the continuous acceleration of the process of urbanization, the annual output of domestic waste per capita in my country is 300kg, with a growth rate of 5% to 8%. Many cities are facing the danger of being surrounded by garbage. Dilemma, the problem of garbage disposal can no longer be ignored. Due to the fast incineration of domestic waste, less floor space, significant reduction and harmlessness effects, more and more attention is paid to the incineration of domestic waste. However, fly ash, whose volume is only 3% to 5% of the amount of waste incineration, is enriched with a large amount of hazar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
Inventor 赵由才孙旭王明超王声东仝欢欢柴晓利牛冬杰
Owner TONGJI UNIV