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

A technology of domestic waste incineration and artificial seawater, applied in the direction of solid waste removal, etc., can solve the problem of high cost, and achieve the effect of simple operation and low processing cost.

Inactive Publication Date: 2011-04-13
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 hi...

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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Experimental program
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Effect test

Embodiment 1

[0027] Take 100g of the above-mentioned fly ash as a sample, take 100ml of the above-mentioned stabilizer (artificial seawater), add the stabilizer to the fly ash, and stir for 10 minutes to fully mix the stabilizer solution with the fly ash to form a thick mortar substance, and the heavy metal in the fly ash The ions react completely with the stabilizer solution, and then the above mixture is dried under natural ventilation conditions, and then it can be landfilled in a hazardous waste landfill. According to the hazardous waste identification standard (GB5086.2-1997), the toxic leaching test was carried out on the treated fly ash, and the results were as follows: figure 2 Shown: show that the leaching concentration of the exceeding standard element lead (lead=14.23mg / L) 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 were detected, reaching the pollution control standard of hazardou...

Embodiment 2

[0029] Get fly ash sample 100g, stabilizer 50ml, fly ash and stabilizer are identical with embodiment 1. Add the stabilizer to the fly ash and stir for 20 minutes to make the stabilizer and fly ash fully mixed 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. can enter the hazardous waste landfill. According to the hazardous waste identification standard (GB5086.2-1997), the fly ash after the treatment was carried out the toxicity leaching test, the result showed that the leaching concentration of lead exceeding the standard was 0.15mg / L, and the concentration of the rest, zinc was 0.06mg / L, The concentration of chromium is 0.035mg / L, and cadmium, nickel and copper are not detected, reaching the pollution control standard of hazardous waste landfill (GB18598-2001). Such as image 3 shown.

Embodiment 3

[0031] Take 100g of fly ash sample, 25ml of stabilizer, add the stabilizer into the fly ash, stir for 30min, make the stabilizer and fly ash fully mixed to form a thick substance, the heavy metal ions in the fly ash react completely with the stabilizer solution, and then The above-mentioned mixture is dried under the condition of natural ventilation, and can enter the hazardous waste landfill for landfilling. According to the hazardous waste identification standard (GB5086.2-1997), the fly ash after the treatment was carried out the toxicity leaching test, the result showed that the leaching concentration of lead exceeding the standard was 0.29mg / L, and the concentration of the rest, zinc was 0.045mg / L, The concentration of chromium is 0.08mg / L, and cadmium, nickel and copper are not detected, reaching the pollution control standard of hazardous waste landfill (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 domestic waste incineration plants. The invention 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 urbanization, the annual output of domestic garbage per capita in my country is 300kg, with a growth rate of 5% to 8%. Many cities are facing the situation of being surrounded by garbage. Dilemma, the problem of garbage disposal can no longer be ignored. Due to the fast speed of domestic waste incineration, small footprint, significant reduction and harmless effects, more and more attention has been paid to domestic waste incineration. However, the fly ash whose volume is only 3% to 5% of the amount of incinerated garbage is enriched with a large amount of...

Claims

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Application Information

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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
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