A method for stabilizing waste incineration fly ash

A technology for waste incineration fly ash and stabilization treatment, which is applied in the field of environmental engineering to achieve the effects of low product price, low treatment cost, and reducing the risk of re-pollution of the environment

Inactive Publication Date: 2011-12-21
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to propose a method for stabilizing waste incineration fly ash, which is low in cost, stable in treatment effect, and does not harm the environment. Secondary pollution

Method used

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  • A method for stabilizing waste incineration fly ash
  • A method for stabilizing waste incineration fly ash
  • A method for stabilizing waste incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take 100g of incineration fly ash sample A, and dissolve 1g of potassium dipropyldithiophosphate and 0.1g of aluminum sulfate in 90mL of water, add the stabilizer solution to the fly ash, and stir the above mixture for 20 minutes to make the heavy metals in the fly ash Completely react with dipropyl potassium dithiophosphate to form a thick mortar mixture, and then dry the above mixture under natural ventilation conditions and landfill safely. The weight ratio of fly ash to potassium dipropyl dithiophosphate is 100:1. According to GB5086.2-1997, the leaching toxicity test was carried out on the stabilized fly ash. The leaching concentration of lead exceeding the standard was 1.2mg / L, the leaching concentration of cadmium was 0.28mg / L, and the leaching concentration of chromium was 1.6mg / L. L, the leaching concentration of zinc is 5.0mg / L, meeting the hazardous waste identification standard and hazardous waste landfill pollution control standard.

Embodiment 2

[0043] Take 100g of incineration fly ash sample A, and dissolve 2.5g of diisopropyl ammonium dithiophosphate in 80mL of water, add the stabilizer solution to the fly ash, and stir the above mixture for 40 minutes to make the heavy metal in the mortar and diisopropyl ammonium Ammonium dithiophosphate reacts completely to form a thick mortar mixture. Then dry the above mixture under natural ventilation conditions and landfill safely. The weight ratio of fly ash to ammonium diisopropyldithiophosphate is 100:2.5. According to GB5086.2-1997, the leaching toxicity test was carried out on the stabilized fly ash. The leaching concentration of lead exceeding the standard was 1.0mg / L, the leaching concentration of cadmium was 0.19mg / L, and the leaching concentration of chromium was 1.4mg / L. L, the leaching concentration of zinc is 4.3mg / L, meeting the hazardous waste identification standard and hazardous waste landfill pollution control standard.

Embodiment 3

[0045]Take 100g of incineration fly ash sample B, take 1.0g of sodium dipropyldithiophosphate, 1.0g of potassium diisopropyldithiophosphate and 0.12g of polyaluminum chloride and dissolve it in 85mL of water, add the stabilizer solution to the fly ash In the ash, stir the above mixture for 25 minutes, so that the heavy metal in the mortar reacts completely with sodium dipropyl dithiophosphate and potassium diisopropyl dithiophosphate to form a thick mortar mixture. Then dry the above mixture under natural ventilation conditions and landfill safely. The weight ratio of fly ash to sodium dipropyldithiophosphate+potassium diisopropyldithiophosphate is 100:2.0. According to GB5086.2-1997, the leaching toxicity test was carried out on the stabilized fly ash. The leaching concentration of lead exceeding the standard was 1.1mg / L, the leaching concentration of cadmium was 0.20mg / L, and the leaching concentration of copper was 5.0mg / L. L, meet the hazardous waste identification standa...

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Abstract

The invention discloses a method for stabilizing waste incineration fly ash, which belongs to the technical field of environmental engineering. The present invention uses dialkyl dithiophosphate compounds or adding flocculants as stabilizers, and the treatment method is: take the above stabilizers and dissolve them in water to make a solution, then add them into fly ash, stir evenly, and form a thick mortar mixture , landfill after natural drying. The weight ratio of the dialkyl dithiophosphate compound to the flocculant in the stabilizer is 100:4 to 100:10, and the weight ratio of the dialkyl dithiophosphate compound to the waste incineration fly ash is 0.5:100 ~3:100, the weight ratio of water to fly ash is 0.7~1.0:1. The main advantages of the present invention are that the dialkyl dithiophosphate compounds have strong chelating ability with heavy metal ions, and the price is low, and the leaching concentration of the stabilized fly ash under the condition of pH 1-13 can satisfy the identification of hazardous wastes Standard, no secondary pollution.

Description

technical field [0001] The invention relates to a harmless and stabilizing treatment method for hazardous waste, which belongs to the technical field of environmental engineering, and particularly relates to a chemical agent stabilization treatment method for waste incineration fly ash. Background technique [0002] With the development of our country's social economy, the continuous acceleration of the urbanization process and the improvement of people's material life, the amount of municipal solid waste is increasing at a rate of about 10% per year. It is estimated that by 2010, the annual output of domestic waste will reach 290 million tons. Municipal waste incineration is an important means of urban waste disposal. However, the incineration process will produce a large amount of fly ash. The output of fly ash is related to the type of waste, incineration conditions, incinerator type and flue gas treatment process. Generally, it accounts for about 3% of the incinerated wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/33A62D101/43
Inventor 徐颖张方朱加征徐天奕
Owner HOHAI UNIV
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