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Low-sulfur chromium contaminated soil remediation agent, preparation method and use method thereof

A technology for chromium-contaminated soil and remediation agent, applied in the field of soil pollution control, can solve problems such as site water and soil acidification, building base corrosion, secondary pollution, etc., to promote reducing ability, maintain structure and acid-base balance, and reduce hexavalent Effects of Chromium Toxicity Leaching Degree and Alkali Digestion Leaching Concentration

Active Publication Date: 2019-11-08
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

[0004] However, the above-mentioned existing hexavalent chromium-contaminated soil remediation technologies, especially the materials related to the solidification and stabilization technology, all have different defects. Among them, the biggest problem is that they all involve the application of a large amount of sulfur-containing substances or sulfur-related bacteria agents, which can easily cause secondary pollution. secondary pollution
When sulfur-containing substances are used in excess, they are easily transformed into sulfates. Long-term accumulation can lead to acidification of water and soil in the site, and bring hidden dangers such as corrosion of building foundations.

Method used

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  • Low-sulfur chromium contaminated soil remediation agent, preparation method and use method thereof
  • Low-sulfur chromium contaminated soil remediation agent, preparation method and use method thereof
  • Low-sulfur chromium contaminated soil remediation agent, preparation method and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0079] The preparation of a low-sulfur type chromium-contaminated soil remediation agent comprises:

[0080]In this embodiment, the sulfur-based material is a pore structure iron-based sulfate mineral with a porosity of 20wt%, a sulfur content of 6wt%, and an iron content of 15wt%. The preparation process of the pore structure iron-based sulfate mineral is The method comprises: dissolving ferrous chloride in sodium sulfate solution at a molar ratio of 1:1, passing through ozone for oxidation to obtain a sulfur-based material; the iron-based material is iron-aluminum hydrotalcite with an iron element content of 60 wt%. .

[0081] Grinding 8g of sulfur-based material to 200 mesh as component A; mixing 42g of iron-based material, 30g of micron iron powder, 15g of wheat bran and 5g of mordenite, both of which have a particle size of 200 mesh , ground to the average particle size of the mixture is 1mm, as the B component, to obtain the soil remediation agent;

[0082] Use this so...

Embodiment 2

[0086] The difference from Example 1 is that the mass of the sulfur-based material in component A is 12 g, and the mass of the iron-based material in component B is 38 g. After the soil is repaired, the soil is tested in the same manner as in Example 1. It was detected that the leaching concentration of hexavalent chromium in the soil sample was reduced from 261.68 mg / L to 0.25 mg / L, and the total amount of hexavalent chromium by alkali digestion was reduced from 2310.61 mg / kg to 6.21 mg / kg.

Embodiment 3

[0088] The difference from Example 1 is that the mass of the sulfur-based material in the A component is 6g, and the mass of the iron-based material in the B component is 44g. After the soil is repaired, the soil is tested in the same manner as in Example 1. It was detected that the leaching concentration of hexavalent chromium in the soil sample decreased from 261.68 mg / L to 0.42 mg / L, and the total amount of hexavalent chromium by alkali digestion decreased from 2310.61 mg / kg to 8.87 mg / kg.

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Abstract

The invention relates to a low-sulfur chromium contaminated soil remediation agent, a preparation method and a use method thereof. The low-sulfur chromium contaminated soil remediation agent includesa sulfur-based material with a sulfur element content of less than or equal to 10wt%, an iron-based material, zero-valent iron-based reductant, biochar and an assistant adsorbent. By utilizing the synergistic effect of the sulfur-based material, the iron-based material, several assistants and other components, the obtained soil remediation agent can achieve chemical stabilization on hexavalent chromium pollutants in the soil, and can reduce the toxic leaching concentration of hexavalent chromium and the total alkali digestion amount. The low-sulfur chromium contaminated soil remediation agentobtained by the invention can be applicable to environmental restoration of various hexavalent chromium contaminated soil, has a moderate dosage and good remediation effect on common hexavalent chromium contaminated soil, and also has the advantages of adjustable shape, low comprehensive cost, and no secondary pollution.

Description

technical field [0001] The invention belongs to the field of soil pollution control, and in particular relates to a low-sulfur chromium-contaminated soil remediation agent and a preparation method and an application method thereof. Background technique [0002] Hexavalent chromium-contaminated soil is a very typical soil type in many complex heavy metal-contaminated soil remediation scenarios in China. Unlike the soil remediation model that has been developed for many years in foreign countries, in China, especially in the past ten years, hexavalent chromium-contaminated site projects that have reached the corresponding acceptance standards relying on rapid restoration still account for a large proportion of the chromium-contaminated soil treatment market. Under this premise, curing and stabilization technology is still the mainstream demand in the domestic industry. [0003] At present, there have been many reports on remediation materials for hexavalent chromium-contamina...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08B09C2101/00C09K17/40
Inventor 毕学王志新
Owner 北京润鸣环境科技有限公司
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