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Curing agent and method for heavy metal in polluted soil

A technology that pollutes soil and heavy metals. It is applied in the field of environmental engineering. It can solve the problems of unfavorable As fixation, no treatment method, and easy leaching of Pb, and achieve the effects of enhancing soil fertility, low cost, and strong metal adsorption capacity.

Active Publication Date: 2015-04-01
JIANGXI LYVJUREN MUNICIPAL GARDEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no effective treatment method for the compound pollution of Pb and As.
Because in the case of higher pH, it is conducive to the fixation of Pb, but not conducive to the fixation of As, conversely, in the case of lower pH, it is beneficial to the fixation of As and not conducive to the fixation of Pb; Pb is easy to leach at low pH

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Weigh 33% fly ash, 34% lime, and 33% peat. The peat is first calcined in a muffle furnace at a high temperature of 450°C for 4.5 hours, and then fully pulverized and mixed by a ball mill to obtain heavy metals in contaminated soil. Hardener;

[0037] 2) Weigh 100g of Pb and As contaminated soil, add 10g of the above curing agent, stir evenly, add tap water with 40% (weight ratio) of the mixture, stir thoroughly for 10min, mix evenly, seal with film, and let stand for 15 days ;

[0038] 3) After 15 days, the cured body was leached by solid waste respectively. Toxic leaching method - acetic acid buffer solution method (HJ / T300-2007) to obtain the leachate, and the soil was measured by "Determination of Soil pH" (Agricultural Industry Standard NY / T 1377-2007) pH value.

[0039] After testing, the leaching concentration of Pb dropped from 34.1 mg / L before curing to 3.7 mg / L after curing, which was lower than the detection value, and the leaching concentration of As dr...

Embodiment 2

[0041] 1) Weigh 40% of fly ash, 40% of lime, and 20% of peat. The peat is first calcined in a muffle furnace at 450°C for 4.5 hours, and then fully pulverized and mixed by a ball mill to obtain heavy metals from contaminated soil. Hardener;

[0042] 2) Weigh 100g of Pb and As contaminated soil, add 15g of the above curing agent, stir evenly, add tap water with 40% (weight ratio) of the mixture, fully stir for 10min, mix evenly, seal with a film, and let it stand for 15 days ;

[0043] 3) After 15 days, the cured body was leached by solid waste respectively. Toxic leaching method - acetic acid buffer solution method (HJ / T300-2007) to obtain the leachate, and the soil was measured by "Determination of Soil pH" (Agricultural Industry Standard NY / T 1377-2007) pH value.

[0044]After testing, the leaching concentration of Pb dropped from 34.8 mg / L before curing to 3.5 mg / L after curing, which was lower than the detection value, and the leaching concentration of As dropped from 21...

Embodiment 3

[0046] 1) Weigh 33% fly ash, 51% lime, and 16% peat. The peat is calcined in a muffle furnace at a high temperature of 450°C for 4.5 hours, and then fully pulverized and mixed by a ball mill to obtain heavy metals from contaminated soil. Hardener;

[0047] 2) Weigh 100g of Pb and As contaminated soil, add 10g of the above curing agent, stir evenly, add tap water with 40% (weight ratio) of the mixture, stir thoroughly for 10min, mix evenly, seal with film, and let stand for 15 days ;

[0048] 3) After 15 days, the cured body was leached by solid waste respectively. Toxic leaching method - acetic acid buffer solution method (HJ / T300-2007) to obtain the leachate, and the soil was measured by "Determination of Soil pH" (Agricultural Industry Standard NY / T 1377-2007) pH value.

[0049] After testing, the leaching concentration of Pb dropped from 34.6 mg / L before curing to 2.8 mg / L after curing, which was lower than the detection value, and the leaching concentration of As droppe...

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Abstract

The invention discloses a curing agent and method for heavy metal in polluted soil. The curing agent for heavy metal in polluted soil is characterized by comprising the three components in percentage by weight: 33-40% of pulverized fuel ash, 34-51% of lime and 16-33% of peat. When the curing agent is used for treating the polluted soil, the curing method comprises the steps of sufficiently mixing the curing agent and heavy metal polluted soil according to the ratio of 1:(10-20) (weight ratio); then, adding water accounting for 40% (weight ratio) of the mixture; and then, sufficiently stirring and mixing. The curing agent for heavy metal in polluted soil, disclosed by the invention, is prepared by taking natural minerals as raw materials, so that no secondary pollution is caused, the soil fertilizer efficiency can be effectively improved while the heavy metal is cured, and the technical problems that the pH value of the soil is remarkably changed and the soil is hardened in the existing chemical remediation method are solved.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a heavy metal solidifying agent for polluted soil and a use method thereof. Background technique [0002] Heavy metals generally refer to about 45 elements with a specific gravity above 5.0g / cm3. Big money in environmental pollution research [0003] The genus mainly refers to elements with significant biological toxicity such as Pb, Cd, Hg, Cr, and metalloid As, and also includes heavy metals such as Zn, Cu, Co, Ni, and Sn with certain toxicity. In recent years, the cadmium rice incidents that have occurred in China have aroused great concern from the party and the country. On February 18, 2011, the "Twelfth Five-Year Plan for Comprehensive Prevention and Control of Heavy Metal Pollution" was officially approved by the State Council and became the first approved "Twelfth Five-Year Plan". According to the requirements of the plan, the central gov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08B09C1/08C09K101/00C09K109/00
Inventor 孟涛
Owner JIANGXI LYVJUREN MUNICIPAL GARDEN CO LTD
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