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A step-by-step leaching method for remediation of heavy metal chromium contaminated soil

A technology for chromium-contaminated soil and heavy metals, applied in the field of soil remediation, can solve problems such as pollution

Active Publication Date: 2022-02-22
HUNAN JINLV ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the present invention proposes a step-by-step leaching repair method for chromium-contaminated soil, which can effectively improve the leaching efficiency of chromium in the soil and solve the problem of soil chromium pollution from the root

Method used

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  • A step-by-step leaching method for remediation of heavy metal chromium contaminated soil
  • A step-by-step leaching method for remediation of heavy metal chromium contaminated soil
  • A step-by-step leaching method for remediation of heavy metal chromium contaminated soil

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Effect test

Embodiment 1

[0037] A step-by-step leaching method for remediation of heavy metal chromium-contaminated soil, according to figure 1 The process flow chart shown includes processes such as pretreatment, oxidation, alkali rinsing, acid rinsing, reduction and neutralization, and specifically includes the following steps:

[0038] (1) Air-dry and crush the contaminated soil, pass it through a 10-mesh sieve, take 100 g of the sieved soil, put it in a 2L beaker, add deionized water at a solid-to-liquid ratio of 1:20, and mix and stir for 5 minutes;

[0039](2) in the slurry prepared in (1), fill ozone and carry out oxidation, oxidation time 15min; Ozone adopts ozone generator to make, and ozone concentration is 20mg / L, and ozone generation is 20g / L;

[0040] (3) Add pH adjuster A1 sodium hydroxide solution to the slurry after (2) oxidation treatment, adjust the pH value to >10, and the concentration of sodium hydroxide solution is 4mol / L; stir and mix for 15min, then add alkali rinse agent B1"K...

Embodiment 2

[0048] A step-by-step leaching method for remediation of heavy metal chromium-contaminated soil, specifically comprising the following steps:

[0049] (1) Air-dry and crush the contaminated soil, pass through a 10-mesh sieve, take 300 g of the sieved soil and place it in a 5L beaker, add deionized water at a solid-to-liquid ratio of 1:10, and mix and stir for 5 minutes;

[0050] (2) Fill the slurry prepared in (1) with ozone for oxidation, and the oxidation time is 10 minutes. Ozone uses an ozone generator with an ozone concentration of 15mg / L and an ozone production of 20g / L;

[0051] (3) Add pH adjuster A1 sodium hydroxide solution to the slurry after the oxidation treatment in (2) to adjust the pH value to >10, and the concentration of the sodium hydroxide solution is 4mol / L. Stir and mix for 15 minutes, then add the combined solution of alkali rinse agent B1 "polyphosphate + sodium lignosulfonate", wherein the dosage of polyphosphate is 0.5%, and the dosage of sodium lign...

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Abstract

The invention discloses a step-by-step leaching method for remediation of heavy metal chromium-contaminated soil, comprising the following steps: S1, oxidation stage; S2, alkali leaching stage: adjusting the pH to be greater than 10 and adding alkali leaching for removing chromium (VI) The lotion is used for rinsing; S3, acid rinsing stage: adjust the pH to less than 4 and add an acid rinsing agent for removing chromium (III) for rinsing; S4, reduction and neutralization stage. According to the different forms of chromium in the soil and its adsorption characteristics under different pH conditions, the method performs step-by-step leaching of hexavalent chromium (VI) and trivalent chromium (Cr(III)) in the soil to achieve Efficient removal of total chromium and hexavalent chromium Cr(VI) in soil; this method has the characteristics of strong pertinence and high removal rate, and the removal rate of total chromium in soil can reach more than 90%, and the removal rate of hexavalent chromium It can reach more than 99%, which can provide a good demonstration for the ex-situ restoration of chromium-contaminated soil.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a step-by-step leaching method for remediation of heavy metal chromium contaminated soil. Background technique [0002] Land resources are the material basis for the survival and development of human beings, and the quality of soil is related to social security. Compared with air pollution and water pollution, soil heavy metal pollution is highly concealed and difficult to be directly detected by the senses. Chromium and its compounds are commonly used industrial raw materials, mainly used in metallurgy, metal processing, electroplating, pigments and other departments. The "three wastes" produced in the production of these departments pose a serious threat to soil safety. Among them, hexavalent chromium Cr(VI) is an inhalation poison, has carcinogenic effect, and is listed as one of the eight most harmful chemical substances to the human body. Long-term living in an environment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 魏勇红喻海彬罗军黄放江湛如袁本琦
Owner HUNAN JINLV ENVIRONMENTAL PROTECTION CO LTD
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