Eluting agent used for remediation of chromium-contaminated soil, remediation method and apparatus

A technology of chromium-contaminated soil and repair method, which is applied in the restoration of contaminated soil, fertilization equipment, soil conditioning materials, etc., can solve the problems of large dosage of leaching agent, low effect, secondary pollution, etc., and achieve small formula dosage, Reduce repair costs and easily degrade

Inactive Publication Date: 2016-02-03
BEIJING GEOENVIRON ENG & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For this reason, the present invention provides a formulation and method of a leaching agent for repairing chromium-contaminated soil. Special technical research and development and optimization have been carried out to solve the current p

Method used

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  • Eluting agent used for remediation of chromium-contaminated soil, remediation method and apparatus
  • Eluting agent used for remediation of chromium-contaminated soil, remediation method and apparatus

Examples

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0029] The components contained in the rinse agent in the following examples of the present invention and the concentration of each component in the rinse agent are as follows.

[0030]

Example 1 Example 2 Example 3 Example 4 Example 5 Citric acidmol / L 0.05 0.18 0.25 0.37 0.5 Sodium dodecylbenzenesulfonate mol / L 0.05 0.02 0.01 0.08 0.07 pH (adjusted with HCl) 1.5 1.5 1.5 3 1

[0031] The preparation method of the above-mentioned eluent is as follows: according to the concentration requirements, citric acid and sodium dodecylbenzenesulfonate are dissolved in water, and hydrochloric acid is added to adjust the pH value.

[0032...

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Abstract

The invention discloses an eluting agent used for remediation of chromium-contaminated soil, a remediation method and an apparatus. The eluting agent is an aqueous solution including the following components: citric acid, sodium dodecyl benzene sulfonate and a pH value conditioning agent, wherein a mol ratio of citric acid to sodium dodecyl benzene sulfonate is 0.05 to 0.5: 0.01-0.1 and the pH value of the eluting agent is 1 to 3. The ex-situ remediation method and in-situ remediation method can be used for remediation of the chromium-contaminated soil. The invention also provides the apparatus used for in-situ remediation. The eluting agent is easy to degrade, poses no secondary pollution to the environment, exerts small influence on the physical and chemical properties of the soil, has a total chromium removal rate of more than 90% and shows good removal effect on trivalent chromium; and chromium in eluted soil is mainly in a residual form, total chromium concentration in the eluted soil is lower than national soil environment standard III, and environmental harm is not posed.

Description

technical field [0001] The invention relates to contaminated site restoration and soil / groundwater restoration, and belongs to the technical field of environmental restoration. In particular, the invention relates to a washing agent, a repairing method and a device for repairing chromium-contaminated soil. Background technique [0002] Chromium pollution in my country's soil and groundwater is very serious, which has caused many environmental problems and social conflicts for many years. As an effective remediation technology for soil heavy metal pollution, in-situ leaching technology has received more and more attention. In-situ leaching technology has the characteristics of low cost, good effect, and fundamental removal of heavy metal pollutants. It has great research and application value in the remediation of heavy metal pollution in soil and groundwater. In-situ leaching technology has been studied abroad earlier, and there are engineering application examples, which ...

Claims

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Application Information

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IPC IPC(8): C09K17/14C09K17/42B09C1/02
Inventor 张岩坤吕正勇魏丽
Owner BEIJING GEOENVIRON ENG & TECH
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