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A stabilized remediation agent for chromium-contaminated soil and a method for its application in soil remediation

A technology of chromium-contaminated soil and remediation agent, applied in the field of soil remediation and contaminated soil remediation, to achieve the effect of reducing soil toxicity, restoring function, and good remediation effect

Active Publication Date: 2020-08-07
北京润鸣环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The first object of the present invention is to provide a stabilized remediation agent for chromium-contaminated soil. In the remediation agent of the present invention, the sludge rich in active microorganisms, nutrients and chemical reducing agents are used comprehensively, so that physical The comprehensive action of chemistry and microbes can effectively remediate chromium-contaminated soil, and solve the shortcomings of single microbial remediation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The content of hexavalent chromium in a polluted soil in Yunnan is 545mg / kg. The leaching method of "Body Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" is used to leaching. The concentration of hexavalent chromium in the leaching solution is 26mg / L, and the total chromium concentration is 30mg / L. .

[0052] Soil remediation method: add 3% by weight of stabilized remediation medicament of the present invention in the soil, and the consumption of each raw material in the medicament is as follows: 1 part of iron powder, 6 parts of wheat bran, 5 parts of organic fertilizer, 4 parts of sludge, and ferrous iron 2 parts of salt; add water to make the soil moisture content reach 40%, seal and maintain;

[0053] After 7 days, the content of hexavalent chromium in the soil was 16mg / kg, and the leaching method of "Body Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" was used to leaching. The concentration of hexavalent chromium...

Embodiment 2

[0056] The content of hexavalent chromium in a polluted soil in Henan is 1600mg / kg, and the leaching method of "body waste leaching toxicity leaching method sulfuric acid and nitric acid method" is used. The hexavalent chromium concentration in the leaching solution is 126mg / L, and the total chromium concentration is 154mg / L .

[0057] Soil remediation method: add 3% by weight of stabilized remediation medicament of the present invention in the soil, and the consumption of each raw material in the medicament is as follows: 1 part of iron powder, 6 parts of wheat bran, 5 parts of organic fertilizer, 4 parts of sludge, and ferrous iron 2 parts of salt; add water to make the soil moisture content reach 40%, seal and maintain;

[0058] After 7 days, the content of hexavalent chromium in the soil was 553 mg / kg, and the leaching method of "Body Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" was used for leaching. The concentration of hexavalent chromium in...

Embodiment 3

[0062] The content of hexavalent chromium in an industrial polluted soil is 5909mg / kg, and the leaching method of "Body Waste Leaching Toxicity Leaching Method" leaching method, the concentration of hexavalent chromium in the leaching solution is 287mg / L, and the total chromium concentration is 296mg / L .

[0063] Soil remediation method: add 5% by weight of stabilized remediation medicament of the present invention in the soil, and the consumption of each raw material in the medicament is as follows: 1 part of iron powder, 6 parts of wheat bran, 5 parts of organic fertilizer, 4 parts of sludge, and ferrous iron 2 parts of salt; add water to make the soil moisture content reach 40%, seal and maintain;

[0064] After 14 days, the content of hexavalent chromium in the soil was 2750mg / kg, and the leaching method of "Body Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" was used to leaching, the hexavalent chromium concentration in the leaching solution was...

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Abstract

The invention provides a stabilization repair agent for chromium-contaminated soil and a method of applying the stabilization repair agent to repair soil. Chromium-contaminated soil can be effectively repaired with the stabilization repair agent through the comprehensive use of sludge rich in activated microbes, nutrients and a chemical reducing agent and through integrated physical, chemical and microbial action. In addition, the stabilization repair agent is applicable to in-situ and ex-situ repair of chromium-contaminated soil.

Description

technical field [0001] The invention relates to the field of contaminated soil remediation, in particular to a stabilized remediation agent for chromium-contaminated soil and a method for applying the same to soil remediation. Background technique [0002] Since the first chrome salt production line was built in 1958, there have been more than 70 chrome salt enterprises in my country, and at most 52 enterprises are producing at the same time. As of 2015, 48 factories have been shut down, and 15 are still in production. The leftover sites of the shut-down companies are the main source of chrome-contaminated sites in my country. In the natural environment, chromium usually exists in stable trivalent and hexavalent valence states, and occasionally there are extremely unstable intermediate states of tetravalent or pentavalent chromium. Hexavalent chromium in soil is usually represented by CrO 4 2- and Cr 2 O 7 2- Due to the high activity of hexavalent chromium, it is diffi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08B09C1/10
CPCB09C1/08B09C1/10B09C2101/00C09K17/40
Inventor 张琢王志新丁苏苏
Owner 北京润鸣环境科技有限公司
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