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Stabilization repair agent for chromium-contaminated soil and method of applying stabilization repair agent to repair soil

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

Active Publication Date: 2017-07-25
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 certain polluted soil in Yunnan is 545mg / kg, and it is leached by the leaching method of "Body waste leaching toxic leaching method sulfuric acid nitric acid method", the concentration of hexavalent chromium in the leaching solution is 26mg / L, and the concentration of total chromium is 30mg / L .

[0052] Soil remediation method: add the stabilized remediation agent of the present invention of 3% weight ratio in soil, each raw material consumption is as follows in the agent: 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. Using the leaching method of "Sulfuric acid nitric acid method for leaching toxic leaching method of body waste", the concentration of hexavalent chromium in the leaching solution...

Embodiment 2

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

[0057] Soil remediation method: add the stabilized remediation agent of the present invention of 3% weight ratio in soil, each raw material consumption is as follows in the agent: 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 concentration of hexavalent chromium in the leaching solution was 46 mg / L, and the concentration of total chromium was 50 mg / L by using the leaching method of "Toxic Leachin...

Embodiment 3

[0062] The content of hexavalent chromium in a certain industrial polluted soil is 5909mg / kg. Using the leaching method of "Body waste leaching toxic leaching method sulfuric acid nitric acid method", the concentration of hexavalent chromium in the leaching solution is 287mg / L, and the concentration of total chromium is 296mg / L .

[0063] Soil remediation method: add 5% weight ratio of the stabilized remediation medicament of the present invention in the soil, and the dosage 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 2750 mg / kg, and the concentration of hexavalent chromium in the leaching solution was 29 mg / L, and the concentration of total chromium was 30 mg / L by using the leaching method of...

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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 soil remediation method thereof. Background technique [0002] Since the first chromium salt production line was built in 1958, there have been more than 70 chromium salt enterprises in my country, with a total of 52 enterprises producing at the same time. As of 2015, 48 companies have been shut down, and 15 companies are still in production. The sites left by the closed companies are the main source of chromium-contaminated sites in my country. In the natural environment, chromium usually exists in two stable trivalent and hexavalent states, and occasionally the extremely unstable intermediate state of tetravalent or pentavalent chromium appears. Hexavalent chromium in soil is usually expressed as CrO 4 2- and Cr 2 o 7 2- Because hexavalent chromium has high activity, it is difficult to be adso...

Claims

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Application Information

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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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