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High-performance composite stabilizer for mercury-contaminated soil and method for repairing mercury-contaminated soil

A composite stabilizer and mercury pollution technology, which is applied in the field of high-efficiency composite stabilizers and heavy metal-contaminated soil treatment agents, can solve the problems of low cost and achieve the effects of wide applicability, insensitive soil physical and chemical properties, and obvious synergistic effect

Active Publication Date: 2017-11-24
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the defects existing in the repair method for mercury-contaminated soil in the prior art, the purpose of the present invention is to provide a method that can simultaneously stabilize and solidify various forms of mercury in mercury-contaminated soil, and has a good stabilization effect and a short period of time. High-efficiency compound stabilizer agent, which has wide sources of raw materials and low cost, which is conducive to wide application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The mercury-contaminated site soil left over from the relocation of a chemical factory in Hunan was taken. The average mercury content in the soil was 120mg / kg. The mercury concentration is 0.13mg / L.

[0049] (1) Crushing and sieving the mercury-contaminated soil to a particle size ≤ 1 cm to remove larger stones and other debris;

[0050] (2) Add an appropriate amount of water to the mercury-contaminated soil to keep the soil moist so that various reactions can be carried out better, and then add a good oxidant (4% potassium persulfate solution is added to 5% HCl solution, the volume ratio 1:10), control the molar ratio of active ingredients in potassium persulfate to mercury element in the soil to be not less than 2:1, stir evenly, and heat for 20 minutes (the temperature is controlled at 80 degrees Celsius), so that the organic mercury and monovalent mercury in the soil into divalent mercury;

[0051] (3) Add 5% sodium sulfide solution, the addition of sodium sulfid...

Embodiment 2

[0057] Get the same soil as in Example 1, and through the same crushing and screening process, add an appropriate amount of water to the mercury-contaminated soil to keep the soil moist, then add the configured oxidant (4% sodium persulfate solution to 5% In the HCl solution, the volume ratio is 1:10), and the molar ratio of the active ingredient in the sodium persulfate to the mercury element in the soil is controlled to be not less than 2:1, stirred evenly, heated for 20min (the temperature is controlled at 80 degrees Celsius), and the remaining steps are Same as Example 1, after curing for 3 days, leaching was carried out according to the "Leaving Toxicity of Solid Waste Leach Method Horizontal Oscillating Method" (HJ557-2009), and the concentration of mercury in the leach solution was 0.0005mg / L, which was higher than the value in Example 1. However, it can meet the mercury leaching concentration requirements in the "Soil Remediation Standards for Heavy Metal Contaminated S...

Embodiment 3

[0059] Get the same soil as in Example 1, and through the same crushing and screening process, add the same oxidizing agent as in Example 1 to carry out the same oxidation reaction, add 5% potassium sulfide solution, and the addition of potassium sulfide is equal to the sulfur element and the soil. The molar ratio of the mercury element in the medium is 2:1, stir evenly, react for 30 minutes, add ferrous chloride, the addition amount is 1% of the soil mass, stir evenly, react for 15 minutes; add bentonite, zeolite and humus The mass ratio is 1:1:1, the total addition is 5% of the soil mass, and it is evenly stirred; the next step of adjusting the pH is the same as in Example 1, and after 3 days of curing, follow the "Solid Waste Leaching Toxicity Leaching Method Horizontal Oscillation Method" (HJ557-2009) is leached, and the concentration of mercury in its leachate is 0.0008mg / L, is higher than the value in embodiment 1, but can meet the heavy metal pollution in " heavy metal c...

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Abstract

The invention discloses a high-performance composite stabilizer for mercury-contaminated soil and a method for repairing the mercury-contaminated soil. The composite stabilizer comprises an oxidizing agent, a composite stabilizer and a pH modifier; the method for repairing the mercury-contaminated soil comprises the steps of crushing and sieving the mercury-contaminated soil, taking screened mercury-contaminated soil granules; adding water to the mercury-contaminated soil granules for moisturizing, adding an oxidizing agent solution, stirring and heating for oxidizing reaction; adding a sulfide salt solution for vulcanization reaction; adding excessive ferrite sediments S2-, adding clay mineral and humus for adsorption, adding the pH modifier to adjust the pH value of the mercury-contaminated soil to be 6-7 and carrying out conservation for over 3 days. According to the method, mercury in multiple forms in the mercury-contaminated soil can be stably solidified at the same time, the stabilization effect is good, the period is short, and the drug is wide in raw material source, low in cost and beneficial to wide application.

Description

technical field [0001] The invention relates to a heavy metal-contaminated soil treatment agent, in particular to a high-efficiency composite stabilizer used for the stabilization treatment of mercury-contaminated soil, and belongs to the technical field of heavy metal-contaminated soil treatment. Background technique [0002] In recent years, with the rapid development of industry and agriculture, a large amount of mercury has been released in the process of production and use, making the soil polluted by mercury more and more serious. The main sources of soil mercury pollution are atmospheric deposition, sewage irrigation, industrial pollution sources (coal-burning, chlor-alkali industry, battery factory, smelting, papermaking and other industries), agricultural pollution sources (use of pesticides and fertilizers), mercury-containing waste (thermometers, waste battery, etc.) mishandled, etc. Mercury and its compounds in the soil can enter the human body through the food ...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08C09K17/40
Inventor 邵乐史学峰韩凤刘晓月李昌武
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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