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A stabilized agent and method for repairing arsenic-contaminated soil using urban solid waste

A technology for arsenic pollution and soil, which is applied in the field of soil pollution remediation, can solve the problems that the stabilization effect is easily affected by acidic conditions, unfavorable for the application of contaminated soil remediation projects, and the soil properties are greatly affected, so as to reduce soil heavy metal pollution and reduce competition Adsorption and easy operation

Active Publication Date: 2022-03-08
SHOUGANG ENVIRONMENTAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The core of the stabilization and remediation technology lies in the stabilization agent. Most of the existing chemical stabilization agents that can be used for the remediation of arsenic-contaminated soil are relatively expensive, which is not conducive to the application of large-scale contaminated soil remediation projects.
The invention patent with the publication number CN102965119B utilizes a variety of organic chemical materials as stabilizers. Although the stabilization effect is good, there is a problem of high material cost; the invention patent with the publication number CN102335494A discloses that the stabilized material can be selected from a variety of alkaline reagents , its stabilization effect is easily affected by acidic conditions; the invention patent with the publication number of CN105062492A uses a catalytic oxidant and an iron-based compound as a stabilization material, which has a greater impact on soil properties and higher cost

Method used

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  • A stabilized agent and method for repairing arsenic-contaminated soil using urban solid waste
  • A stabilized agent and method for repairing arsenic-contaminated soil using urban solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In this example, the soil to be repaired is taken from a certain iron and steel metallurgical industrial site.

[0049] First execute S101, measure the heavy metal content in the leachate of the soil to be repaired, and obtain the measurement result of the heavy metal content in the leachate of the repaired soil;

[0050] Specifically, after leaching in the "Solid Waste Leaching Toxicity Method Sulfuric Acid Nitric Acid Method" (HJ 299-2007), the content of arsenic ions in the leachate was analyzed by the method of "Appendix E of Leach Toxicity Identification of Hazardous Waste Identification Standards" (GB 5085.3-2007). The concentration of arsenic ions in the medium is 0.231mg / L.

[0051] Next, perform S102-S104, according to the measurement results, mix the stabilizing agent described in any one of the above and the soil to be repaired at a mass ratio of (1-10): 100 to obtain a first mixture; Adding water to the first mixture and then mixing to obtain a second mixtu...

Embodiment 2

[0055] The soil to be repaired was taken from a lead-zinc smelting site.

[0056] First execute S101, measure the heavy metal content in the leachate of the soil to be repaired, and obtain the measurement result of the heavy metal content in the leachate of the repaired soil;

[0057] Specifically, after leaching in the "Solid Waste Leaching Toxicity Method Sulfuric Acid Nitric Acid Method" (HJ 299-2007), the content of arsenic ions in the leachate was analyzed by the method of "Appendix E of Leach Toxicity Identification of Hazardous Waste Identification Standards" (GB 5085.3-2007). The arsenic ion concentration in the medium is 0.51mg / L.

[0058] Next, perform S102-S104, according to the measurement results, mix the stabilizing agent described in any one of the above and the soil to be repaired at a mass ratio of (1-10): 100 to obtain a first mixture; Adding water to the first mixture and then mixing to obtain a second mixture; moisturizing and curing the second mixture to ...

Embodiment 3

[0062] The soil to be repaired was taken from an iron and steel metallurgical contaminated site.

[0063] First execute S101, measure the heavy metal content in the leachate of the soil to be repaired, and obtain the measurement result of the heavy metal content in the leachate of the repaired soil;

[0064] Specifically, after leaching in the "Solid Waste Leaching Toxicity Method Sulfuric Acid Nitric Acid Method" (HJ 299-2007), the content of arsenic ions in the leachate was analyzed by the method of "Appendix E for Identification of Leaching Toxicity in Identification Standards for Hazardous Wastes" (GB5085.3-2007). The concentration of arsenic ions in the leaching solution was 0.58mg / L.

[0065] Next, perform S102-S104, according to the measurement results, mix the stabilizing agent described in any one of the above and the soil to be repaired at a mass ratio of (1-10): 100 to obtain a first mixture; Adding water to the first mixture and then mixing to obtain a second mixt...

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Abstract

The invention relates to a stabilizing agent for repairing arsenic-polluted soil by using urban solid waste, which comprises, by weight, 100 parts of quicklime, 10-50 parts of fly ash and 30-80 parts of red brick powder. After adsorption, complexation and precipitation, the soil heavy metal pollution can be significantly reduced and the relevant environmental protection standards can be met. At the same time, construction waste and industrial waste are used as raw materials for the preparation of the restoration agent, which has wide sources, low cost, simple preparation method, and convenient operation. On this basis, it also has a certain environmental protection effect of waste disposal.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation, and in particular relates to a stabilizing agent and a method for remediating arsenic-contaminated soil by using urban solid waste. Background technique [0002] In recent years, environmental pollution and health hazards caused by heavy metals have attracted widespread attention. Heavy metal arsenic is widely used in the production, mining and smelting of pesticides, preservatives and pharmaceutical reagents in my country. Arsenic is a carcinogen that is toxic to humans and animals, and its environmental hazards and health safety have received special attention. At present, the commonly used soil arsenic pollution treatment and remediation technologies researched at home and abroad are mainly divided into: (1) solidification / stabilization treatment technology; (2) vitrification treatment technology; (3) soil leaching treatment technology; (4) in-situ treatment technology Ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08C09K17/40C09K101/00
CPCB09C1/08C09K17/40B09C2101/00C09K2101/00
Inventor 赵少丹马刚平周宇邹翔赵涛李世青曹学龙
Owner SHOUGANG ENVIRONMENTAL IND
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