Heavy metal stabilizing agent and method for treating heavy metal contaminated soil by using same

A technology of heavy metal stabilizer and polluted soil, which is applied in the field of environmental chemistry, can solve problems such as easy anti-dissolution, and achieve chemical effect strengthening, high geochemical stability, and good treatment effect

Active Publication Date: 2013-03-13
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a heavy metal stabilizer and a method for using it to treat heavy metal-contaminated soil. The stabilizer has good stability in treating soil, and solves the technical problem that the existing curing agent and curing method are easy to dissolve

Method used

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  • Heavy metal stabilizing agent and method for treating heavy metal contaminated soil by using same
  • Heavy metal stabilizing agent and method for treating heavy metal contaminated soil by using same
  • Heavy metal stabilizing agent and method for treating heavy metal contaminated soil by using same

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Experimental program
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Effect test

Embodiment 1

[0032] Pb-contaminated soil was selected as the sample for this implementation, and the Pb concentration was 864.5mg / kg. The heavy metal stabilizer (proportioning (mass percentage) is: sodium dihydrogen phosphate is 40%, bentonite is 25%, fluorapatite is 30%, sodium chloride is 5%) and tap water are stirred according to the mass ratio of 1:20 After dissolving, add it to the sample according to the mass ratio of medicament to sample: 1:400, mix evenly, and let it stand for more than 30 minutes. Samples were dried for analysis and determination. The leaching experiment was carried out on the sample by the flipping leaching procedure, and the treated leaching solution was determined by atomic absorption.

[0033] After testing, the leaching concentration of the heavy metal Pb was 31.54 mg / L of the sample leach solution before the stabilization treatment, and 2.31 mg / L of the sample leach solution after the treatment. It can be seen that the treated soil sample meets the national...

Embodiment 2

[0035]Pb-contaminated soil was selected as the sample for this implementation, and the Pb concentration was 859.6mg / kg. The heavy metal stabilizer (proportioning (mass percentage) is: sodium dihydrogen phosphate is 50%, bentonite is 20%, fluorapatite is 25%, sodium chloride is 5%) and tap water are stirred according to the mass ratio of 1:20 After dissolving, add it to the sample according to the ratio of medicament to sample mass ratio of 1:500, mix evenly, and let it stand for more than 30 minutes. Samples were dried for analysis and determination. The leaching experiment was carried out on the sample by the flipping leaching procedure, and the treated leaching solution was determined by atomic absorption.

[0036] After testing, the leaching concentration of heavy metal Pb was 32.18 mg / L of the sample leach solution before stabilization treatment, and 2.27 mg / L of the sample leach solution after treatment. It can be seen that the treated soil samples meet the national stan...

Embodiment 3

[0038] Pb-contaminated soil was selected as the sample for this implementation, and the Pb concentration was 389.2mg / kg. The heavy metal stabilizer (proportioning (mass percentage) is: sodium dihydrogen phosphate is 45%, bentonite is 25%, fluorapatite is 25%, sodium chloride is 5%) and tap water are stirred according to the mass ratio of 1:20 After dissolving, add it to the sample according to the ratio of medicament to sample mass ratio of 1:1000, mix evenly, let it stand for more than 30 minutes, take samples and dry them for analysis and determination. The leaching experiment was carried out on the sample by the flipping leaching procedure, and the treated leaching solution was determined by atomic absorption.

[0039] After testing, the leaching concentration of the heavy metal Pb was 8.97 mg / L of the sample leach solution before the stabilization treatment, and 1.28 mg / L of the sample leach solution after the treatment. It can be seen that the treated soil sample meets th...

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Abstract

The invention discloses a heavy metal stabilizing agent and a method for treating heavy metal contaminated soil by using the heavy metal stabilizing agent. The heavy metal stabilizing agent is prepared from the following raw materials in percentage by weight: 40 to 50 percent of phosphate, 20 to 25 percent of bentonite, 25 to 30 percent of fluor apatite and 4 to 6 percent of sodium chloride/potassium chloride. When the heavy metal stabilizing agent is used for treating the contaminated soil, the heavy metal stabilizing agent and water are mixed together to form a suspension, then the suspension is added into the heavy metal contaminated soil, and the suspension and the heavy metal contaminated soil are fully mixed. The heavy metal stabilizing agent has high stability for treating soil, and the technical problem that the conventional curing agent and curing method cause reverse dissolution easily is solved.

Description

technical field [0001] The invention relates to the technical field of environmental chemistry, in particular to a heavy metal stabilizer and a method for treating heavy metal polluted soil with it. Background technique [0002] Heavy metal pollution in the environment of our country has been relatively serious and widespread. Heavy metal pollution in the environment not only affects the yield and quality of crops and aquatic products, but also involves the quality of the air and water environment, and can endanger human life and health through the food chain. Due to the complex sources of heavy metals, the different forms of heavy metals in the environment, the interaction between different heavy metals and other pollutants, the complexity of various compound pollutions increases the difficulty of heavy metal research, and heavy metals are harmful to animals, plants and humans. Long-term, latent and irreversible. [0003] Therefore, my country's environmental protection de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02B09C1/08
Inventor 孙福成裘知张宗霖钟重
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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