In-situ injection remediation method for hexavalent chromium-contaminated soil

A technology of contaminated soil and in-situ injection, applied in the restoration of contaminated soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of reducing the concentration of hexavalent chromium and the leaching concentration of trivalent chromium, and achieve strong reducibility , Improve the repair effect, increase the effect of contact chance

Inactive Publication Date: 2017-09-08
爱土工程环境科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies in the ectopic remediation technology of hexavalent chromium-contaminated soil, the present invention provides an in-situ injection repair method for hexavalent chromium-contaminated soil, which uses special agents to inject hexavalent chromium-contaminated soil, and utilizes adsorption, chelation, chemical Reduction, precipitation and other principles, reducing hexavalent chromium to trivalent chromium, and then stabilizing trivalent chromium to reduce the concentration of hexavalent chromium in the soil and the leaching concentration of trivalent chromium, thereby reducing the environmental risk of hexavalent chromium polluted soil, for the development and utilization of land

Method used

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  • In-situ injection remediation method for hexavalent chromium-contaminated soil

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preparation example Construction

[0034] The preparation method of the carbon nanotubes modified by the crown ether is as follows:

[0035] The first step, the acidification of carbon nanotubes, every 5g of multi-walled carbon nanotubes is placed in the mixed system of hydrochloric acid and sulfuric acid of 50ml, the volume ratio of hydrochloric acid and sulfuric acid is 2: 1, what hydrochloric acid adopts is the concentrated hydrochloric acid of 37%, Sulfuric acid is 98% concentrated sulfuric acid, oscillated in an ultrasonic environment, so that the multi-walled carbon nanotubes are evenly dispersed in the mixed acid, heated to 40°C and stirred for 4 hours, cooled to room temperature, and diluted with deionized water 5 times the volume of the mixed acid , filtered, and the acidified carbon nanotubes were washed 3 times with deionized water to remove the residual acid in the carbon nanotubes, and the product was dried at 70° C. for 24 hours in a vacuum environment of 0.1Mpa to obtain a solid with a smooth surf...

Embodiment 1

[0048] The preparation of embodiment 1 crown ether

[0049] Dissolve 1mol of 2,6-bis(hydroxymethyl)phenol and 1mol of 2,2-dimethylpropane in 50ml of dichloromethane solution, add 0.05mol of trifluoromethanesulfonic acid catalyst, and stir the reaction at room temperature for 2 hours, After filtration, the solution was concentrated on a rotary evaporator to obtain (2,2,6-trimethyl-4H-1,3-benzodioxin-8-methyl)methanol; 1 mol of (2,2, 6-trimethyl-4H-1,3-benzodioxin-8-methyl)methanol was dissolved in 40ml of dichloromethane solution, 1mol of pyridinium chlorochromate was added for acetalization, and the reaction was stirred at room temperature for 1.5 hour, filtered, and the solution was concentrated on a rotary evaporator to obtain (2,2,6-trimethyl-4H-1,3-benzodioxin-8-methyl)formaldehyde; 1mol (2,2, Dissolve 6-trimethyl-4H-1,3-benzodioxin-8-methyl)formaldehyde in 65ml of n-hexane, and pass hydrogen bromide gas at a rate of 80ml per minute to realize deprotection and benzyl brom...

Embodiment 2

[0052] Embodiment 2 Crown ether modified carbon nanotubes

[0053] Take 5g of multi-walled carbon nanotubes and place them in 50ml of hydrochloric acid and sulfuric acid mixed system. The volume ratio of hydrochloric acid and sulfuric acid is 2:1. Shake the environment to disperse the multi-walled carbon nanotubes evenly in the mixed acid, heat to 40°C and stir for 4 hours, cool to room temperature, add 5 times the volume of the mixed acid to dilute the solution with deionized water, filter, and the carbon nanotubes after acidification are deionized Wash 3 times with water to remove the residual acid in the carbon nanotubes, and dry the product at 70°C for 24 hours under a 0.1Mpa vacuum environment to obtain a solid with a smooth surface; 10g of the crown ether compound prepared in Example 1 was dissolved in N, N-dimethyl In 70ml of methyl formamide, ultrasonically oscillate for 25 minutes to fully dissolve, filter to obtain a yellow solution, add 8g of acidified multi-walled ...

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Abstract

The invention relates to an in-situ injection remediation method for hexavalent chromium-contaminated soil. The method is characterized in that injection wells are distributed in a honeycomb pattern in a site contaminated area, and two injection liquids are adopted and injected into the contaminated soil in sequence at twice; through the principles including adsorption, chelation, reduction, precipitation and the like, hexavalent chromium (Cr6+) is converted into low-toxicity trivalent chromium (Cr3+), trivalent chromium (Cr3+) is subjected to stabilization, and therefore the purpose of reducing the environment risk of the hexavalent chromium-contaminated soil is realized. According to the in-situ injection remediation method for the hexavalent chromium-contaminated soil, the concentration of hexavalent chromium in the soil and the total chromium leaching concentration are greatly reduced, the environmental risk of the site contaminated soil is reduced to a acceptable level, and the diffusion of contaminants during the remediation process is effectively prevented by adopting the in-situ remediation.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal-contaminated soil, and in particular relates to an in-situ injection repair method for hexavalent chromium-contaminated soil. Background technique [0002] In the production process of metal chromium and chromium salts in leather, electroplating, casting, metallurgy, chemical industry, aerospace and other industries, chromium enters the soil environment through the atmosphere, waste water, solid waste, and production equipment running, dripping, leaking, etc. , causing pollution to the soil environment. Chromium in soil is mainly Cr 3+ and Cr 6+ There are two forms, Cr in soil 3+ It mainly exists in the form of hydroxide, has low fluidity, and is a low-toxic or slightly toxic form, and is generally not easily oxidized to Cr by environmental conditions. 6+ . Studies have shown that Cr 6+ The toxicity is Cr 3 + 100 times of Cr 6+ Very soluble in water, with strong mobility, easy to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/02
CPCB09C1/08B09C2101/00C09K17/02
Inventor 吴启模周治安陈一文李娜何依琳洪源源肖伟张凤英
Owner 爱土工程环境科技有限公司
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