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Method for repairing soil polluted by arsenic

A technology for arsenic-contaminated soil, applied in the field of contaminated soil remediation, can solve problems such as poor effect of arsenic-contaminated soil, and achieve the effect of small environmental impact and high benefit

Active Publication Date: 2016-05-25
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing methods for in-situ remediation of arsenic-contaminated soil are ineffective

Method used

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  • Method for repairing soil polluted by arsenic

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with specific examples, so that those skilled in the art can better understand the present invention and implement it, but the given examples are not intended to limit the present invention.

[0038] The method for remediating arsenic-contaminated soil provided by the invention comprises the following steps:

[0039] 1) Configuration and addition of stabilizing agents

[0040] Main ingredient: FeSO 4 ·7H 2 O and CaO

[0041] Since pH has a great influence on the final arsenic leaching concentration, in practical engineering applications, it is necessary to control the amount of CaO added in the reagent to ensure that the pH of the final leaching solution is within an appropriate range. Specifically, add water to the chemical pool first, then add CaO, stir continuously, and then add FeSO 4 ·7H 2 O, stir evenly, and finally inject the prepared stabilizing agent into the arsenic-contaminated soil eve...

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Abstract

The invention discloses a method for repairing soil polluted by arsenic. The method is characterized by comprising the following steps: (1) taking a stabilized medicament and mixing with the soil polluted by arsenic, and conserving, wherein the stabilized medicament is prepared from the following components: FeSO4.7H2O, CaO and water; (2) taking a curing agent and mixing into the soil treated by the step (1), and conserving, wherein the curing agent is prepared from the following components: cement, water, sodium silicate and bentonite. By adopting a manner of combining the stabilized medicament with the curing agent and injecting in situ, the site soil polluted by heavy metal is subjected to curing and stabilization treatment, and the leaching concentration of heavy metal arsenic in the treated soil is lower than IV type water standards in the Underground Water Quality Standards (GB / T14848-93).

Description

technical field [0001] The invention belongs to the field of contaminated soil remediation, and relates to a method for remediating arsenic-contaminated soil, which stabilizes and solidifies the arsenic and reduces the dissolution of arsenic. Background technique [0002] With the rapid development of social economy, various industrial wastes, domestic sewage, agricultural production activities and other places are discharged, resulting in serious pollution of heavy metals in environmental media such as soil and water. Heavy metal elements are one of the main environmental pollutants, which are difficult to degrade, easy to accumulate, and highly toxic, and can endanger human health through the food chain. The heavy metals in the heavy metal polluted site gradually dissolve and migrate and diffuse under the erosion of rainwater and groundwater, posing a pollution threat to the surrounding environment and a potential risk to human health. Therefore, the restoration of heavy m...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 吕正勇魏丽冯国杰赵凡甄胜利金勇范吉强苗竹
Owner BEIJING GEOENVIRON ENG & TECH
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