Remediation method for arsenic contaminated soil

A remediation method, arsenic-polluted technology, applied in the field of remediation of arsenic-contaminated soil, can solve problems such as immature stabilization methods, and achieve the effect of reducing treatment costs

Active Publication Date: 2018-12-18
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stabilization method of this kind of combined pollution of organic arsenic and inorganic arsenic containing benzene ring is not yet mature

Method used

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  • Remediation method for arsenic contaminated soil
  • Remediation method for arsenic contaminated soil
  • Remediation method for arsenic contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The test soil preparation is as follows Table 1

[0029] Table 1

[0030]

[0031] experiment procedure:

[0032] (1) Stir the soil and water at a ratio of 1:200 to make a slurry, then add 1mol / L of a mixture of sodium polyphosphate and sodium silicate, and stir evenly;

[0033] (2) Iron alloy material is used as anode, aluminum alloy material is used as cathode, and the constant current density is 50mA / cm 2 . Expose air at a speed of 50ml / s to the uniformly stirred mud in step (1), and continuously stir the electrolysis reaction for 2h;

[0034] (3) Switch electrodes and adjust the constant current density to 150mA / cm 2 , stop the aeration, and continue stirring the electrolysis reaction of the mud obtained in step (2) for 1 hour.

[0035] After the electrolysis was completed and the mud was stabilized for 48 hours, it was detected that the removal rates of 3-amino-4-hydroxyphenylarsineic acid and p-aminophenylarsineic acid in the soil reached 90% and 95% respe...

Embodiment 2

[0037] The test soil preparation is as follows Table 2

[0038] Table 2

[0039]

[0040] experiment procedure:

[0041] (1) Stir the soil and water at a ratio of 1:180 to make a slurry, then add 4mol / L of ethylenediaminetetraacetic acid and sodium silicate mixture, and stir evenly;

[0042] (2) Using scrap iron material as the anode, aluminum material as the cathode, and a constant current density of 80mA / cm 2 . Expose air at a speed of 50ml / s into the uniformly stirred mud in step (1), and continue to stir the electrolysis reaction for 2.5h;

[0043] (3) Switch electrodes and adjust the constant current density to 200mA / cm 2 , stop the aeration, and continue stirring the electrolysis reaction of the mud obtained in step (2) for 1.5h.

[0044] After the electrolysis was completed and the mud was stabilized for 48 hours, it was detected that the removal rate of 3-nitro-4-hydroxyphenylarsine acid in the soil was 90%, and the removal rate of sodium arsenate was 98%, whic...

Embodiment 3

[0046] The test soil preparation is as follows Table 3

[0047] table 3

[0048]

[0049] experiment procedure:

[0050] (1) Stir the soil and water at a ratio of 1:190 to make a slurry, then add 2mol / L mixture of ethylenediaminetetraacetic acid and sodium silicate, and stir evenly;

[0051] (2) Using pure iron as the anode and pure aluminum as the cathode, the constant current density is 25mA / cm 2 . Expose air at a speed of 100ml / s into the uniformly stirred mud in step (1), and continue to stir the electrolysis reaction for 1h;

[0052] (3) Switch electrodes and adjust the constant current density to 100mA / cm 2 , stop the aeration, and continue stirring the electrolysis reaction of the mud obtained in step (2) for 0.5h.

[0053] After the electrolysis was completed and the mud was stabilized for 48 hours, it was detected that the removal rate of sodium dimethylarsinate in the soil was 95%, and the removal rate of sodium arsenate was 99%. The As in the repaired soil w...

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Abstract

The invention belongs to the soil remediation field, and discloses a remediation method for arsenic contaminated soil. The remediation method comprises the following steps of: mixing the arsenic contaminated soil with water and complex, and stirring to form mud; electrolyzing the mud under a neutral air aeration environment; and switching electrode polarity, and re-electrolyzing the mud under an oxygen-deficient environment, wherein the complex is at least one of ethylene diamine tetraacetic acid, N, N'-ethylenediamine disuccinic acid, nitrilotriacetic acid, sodium or potassium polyphosphate,sodium silicate and potassium silicate. The remediation method realizes complete mineralization and stabilization of organic arsenic in the soil, so that the remediated soil is low heavy metal leaching amount, and remarkably weakens biological and plant utilization deficiency of arsenic.

Description

technical field [0001] The invention belongs to the field of soil remediation, and more specifically relates to a method for remediating arsenic-contaminated soil. Background technique [0002] Aromatic organic arsenic, such as p-aminophenylarsineic acid and 3-nitro-4-hydroxyphenylarsineic acid, is widely used in my country's livestock and poultry breeding industry because of its broad-spectrum sterilization, promotion of livestock growth, and increase of egg production rate. . However, this kind of aromatic organic arsenic is difficult to be metabolized and decomposed in animals, and most of them are excreted in the feces as drug prototypes. Due to the high water solubility of this kind of organic arsenic, it is easy to migrate and diffuse into the soil, and due to biological and abiotic effects in the soil, it is transformed into inorganic arsenic with stronger migration ability and higher toxicity. As the largest producer of livestock and poultry meat in China, the annua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/085
Inventor 吕正勇冯国杰徐剑锋范吉强李淑彩苗竹宋登慧朱湖地
Owner BEIJING GEOENVIRON ENG & TECH
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