Method for evaluating leaching toxicity of municipal waste incineration fly ash

A technology for incinerating fly ash and urban waste, applied in biochemical equipment and methods, microbe determination/inspection, color/spectral characteristic measurement, etc., can solve the problem of inaccurate results and the inability to guarantee the biological safety of fly ash or its processed products And other issues

Active Publication Date: 2020-12-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the evaluation of incineration fly ash by using TCLP toxicity leaching procedure or other toxicity evaluation methods based on TCLP is inaccurate. Because toxic substances can eventually biomagnify in animals and humans through the food chain, the incineration fly ash Leach toxicity such as TCLP does not guarantee the biosafety of fly ash or its processed products even within safe thresholds
Therefore, there is currently a lack of methods for scientific testing and evaluation of fly ash toxicity.

Method used

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  • Method for evaluating leaching toxicity of municipal waste incineration fly ash
  • Method for evaluating leaching toxicity of municipal waste incineration fly ash
  • Method for evaluating leaching toxicity of municipal waste incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] S1. Dry the waste incineration fly ash samples from the same batch of waste incineration power plants at 105°C for 24 hours, and seal them for future use. The TCLP test results are shown in Table 1;

[0046] S2. Take concentrated sulfuric acid and concentrated nitric acid and mix them with a volume ratio of 2:1. After mixing evenly, add the mixed solution dropwise to deionized water to make the pH value to 4 to make an extraction agent;

[0047] S3. Weigh 10g of the sample obtained in step S1 and 100mL of the extraction agent obtained in step S2, shake and mix in a PE barrel, seal and fix it on a flipping oscillating device, turn and shake at a speed of 30rpm at room temperature for 18h, The resulting suspension was filtered through a 0.3 μm microporous membrane to obtain a leaching solution. The leaching solution was alkaline and had a pH value of 11;

[0048] S4, the leachate that step S3 is obtained is acidified to pH 7.4, by adding 0.3g of beef extract, 1g of pepton...

Embodiment 2

[0070] S1. Dry the waste incineration fly ash sample from the same batch of waste incineration power plant at 105°C for 24 hours, and seal it for storage for later use. The TCLP toxicity test results of waste incineration fly ash are shown in Table 2;

[0071] S2. Take concentrated sulfuric acid and concentrated nitric acid and mix them with a volume ratio of 2:1. After mixing evenly, add the mixed solution dropwise to deionized water to make the pH value to 3 to make an extraction agent;

[0072] S3. Weigh 10g of the sample obtained in step S1 and 100mL of the extraction agent obtained in step S2, shake and mix in a PE barrel, seal and fix it on an inverting oscillating device, and invert and oscillate at a speed of 40rpm for 18h at room temperature, The resulting suspension was filtered through a 0.4 μm microporous membrane to obtain a leaching solution. The leaching solution was alkaline and had a pH value of 12;

[0073] S4, the leachate that step S3 is obtained is by acid...

Embodiment 3

[0095] S1. Dry the waste incineration fly ash samples from the same batch of waste incineration power plants at 105°C for 24 hours, and seal them for future use. The TCLP test results are shown in Table 3;

[0096] S2. Take concentrated sulfuric acid and concentrated nitric acid and mix them with a volume ratio of 2:1. After mixing evenly, add the mixed solution dropwise to deionized water to make the pH value reach 5 to make an extraction agent;

[0097] S3. Weigh 10g of the sample obtained in step S1 and 100mL of the extraction agent obtained in step S2, shake and mix in a PE barrel, seal and fix it on a flipping oscillating device, turn and shake at a speed of 30rpm at room temperature for 18h, The resulting suspension was filtered through a 0.5 μm microporous membrane to obtain a leaching solution. The leaching solution was alkaline and had a pH value of 12;

[0098] S4, the leachate that step S3 is obtained is by acidifying to pH 7.4, by adding 0.3g beef extract, 1g pepto...

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Abstract

The invention discloses a method for evaluating leaching toxicity of municipal waste incineration fly ash. The method comprises the following steps: S1, preparing a waste incineration fly ash sample;S2, preparing a leaching agent; S3, adding the sample prepared in the step S1 into the leaching agent prepared in the step S2 to prepare a leaching solution; S4, preparing a bacterial culture solution; S5, culturing the bacteria and evaluating the activity of the bacteria; S6, if the bacterial activity in the step S5 is qualified after being detected, further preparing a cell culture solution, andif the bacterial activity in the step S5 is unqualified after being detected, performing comet assay and western blot detection; S7, culturing cells; S8, taking the cells cultured in the step S7 formulti-cytotoxicity test, and evaluating the cell activity; S9, if the cell activity in the step S8 is detected to be qualified, ending the test, and if the cell activity is detected to be unqualified,performing comet assay; and S10, performing western blot analysis by the cells obtained in the step S7. According to the method, the toxic reaction of bacteria and biological cells to the leaching solution is directly utilized, and the method can be used for scientifically evaluating the toxicity detection of the waste incineration fly ash.

Description

technical field [0001] The invention relates to the technical field of environmental analysis and detection, in particular to a method for evaluating the leaching toxicity of municipal waste incineration fly ash. Background technique [0002] Incineration fly ash is a kind of solid by-product produced in municipal waste incineration power generation technology. Its main components include silicates, carbonates, chlorides, a small amount of organic matter and heavy metals. Among these components, especially heavy metals, Such as Pb, Cr, Cd, Cu and Zn, etc., have serious harmful effects on the natural environment and biological safety. Therefore, waste incineration fly ash is classified as hazardous waste by various governments, and it is also the main research object for eliminating secondary pollution in municipal waste incineration technology. [0003] The harmfulness of incineration fly ash to the environment is essentially the result of the migration and transformation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12Q1/02G01N21/31G01N33/68
CPCC12Q1/02G01N21/31G01N33/68G01N33/5014
Inventor 邓怡杨为中韩秋阳赵建奎陈勇
Owner SICHUAN UNIV
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