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A small-molecule acid-coupled reduction-oxidation integrated ex-situ remediation method for organically polluted soil

A technology of organic pollutants and small molecular acids, applied in the field of environmental chemistry, can solve problems such as failure to repair, achieve cost savings, promote efficient oxidation, degradation and mineralization, and enhance the ability to reduce organic matter

Active Publication Date: 2022-04-01
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a single reduction technology can effectively reduce or even dechlorinate the nitro group of chloronitrobenzene, it is easy to generate chloroaniline and other highly toxic intermediate products, which cannot achieve effective and thorough repair.

Method used

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  • A small-molecule acid-coupled reduction-oxidation integrated ex-situ remediation method for organically polluted soil
  • A small-molecule acid-coupled reduction-oxidation integrated ex-situ remediation method for organically polluted soil

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1 Reduction, Oxidation and Reduction-Oxidation Coupling Technology Ex-situ Remediation of Chlorinated Nitrobenzene Contaminated Soil

[0028] The chloronitrobenzene-contaminated soil was taken from a pharmaceutical and chemical contaminated site in Wuhan. After sampling, the contaminated soil was air-dried, crushed, and sieved to form a uniform soil sample. For the remediation of chloronitrobenzene polluted site soil, add 2wt% iron powder in 300g soil, add the ascorbic acid aqueous solution that mass concentration is 7.5% after stirring and mixing (ascorbic acid quality is 0.5wt% of soil amount); Add an effective mass concentration of 13.5% hydrogen peroxide solution (the effective hydrogen peroxide mass is 1.8wt% of the soil amount) after 1 day, stir and mix evenly, and continue to react for one week (recorded as reduction oxidation 1). Set up control experiment as follows simultaneously: (1) add iron powder as reducing agent, do not add ascorbic acid reaction ...

Embodiment 2

[0029] Example 2 Reduction, Oxidation and Reduction-Oxidation Coupling Technology Ex-situ Remediation of Chlorobenzene Contaminated Soil

[0030] The chlorobenzene-contaminated soil was taken from a pesticide chemical pollution site in Wuhan, mainly containing chlorobenzene, 1,4-dichlorobenzene, and 1,2-dichlorobenzene. After sampling, the contaminated soil was air-dried, crushed, and sieved to form a uniform soil sample. For the remediation of organochlorine pesticide-contaminated site soil, add 3.3wt% iron boride powder (obtained with boric acid and iron powder ball milling) in 300g soil, and mass concentration is 4% protocatechuic acid aqueous solution (protocatechuic acid mass 0.2wt% of soil amount), stirring and mixing evenly; add hydrogen peroxide and protocatechuic acid mixed aqueous solution after three days of reaction, the effective mass concentration of hydrogen peroxide in this solution is 16%, and the mass concentration of protocatechuic acid is 3% ( The mass of ...

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Abstract

The invention belongs to the field of environmental chemistry, and in particular relates to a method for reducing-oxidizing integrated ex-situ repairing of organic pollutant soil coupled with small molecular acids. In the first stage, add zero-valent iron materials and natural organic small molecular acids to the concentrated piled soil, stir and mix evenly, stir and mix evenly, and perform a reduction reaction for a period of time. This stage is mainly to reduce the target pollutants; in the second stage, add hydrogen peroxide , or a mixed solution of hydrogen peroxide and small molecular acid, stir and mix evenly, and perform Fenton oxidation removal on the reduced organic pollutant soil. The natural organic small molecule acid coupling agent added in this method plays the role of coupling the two stages of reduction reaction and oxidation reaction, which can enhance the efficiency of reduction and oxidation at the same time, and finally realizes the integration of reduction-oxidation to efficiently remove organic pollutants and solve the problem of The single use of reduction or oxidation technology to remove the problem of low efficiency has a better effect of remediation of organic polluted soil.

Description

technical field [0001] The invention belongs to the field of environmental chemistry, and specifically relates to a reduction-oxidation integrated ex-situ repair method for organic pollutant soil, which is used as a coupling agent to simultaneously enhance reduction and oxidation efficiency with small natural organic molecules, and is suitable for industries such as industry, agriculture, and medicine. Remediation of organic-contaminated soil. Background technique [0002] With the rapid development of industrialization and urbanization, the problem of soil pollution in my country is becoming more and more serious. Among them, the problem of organic pollution caused by pesticide, coal chemical, petrochemical and other industries is very serious, and the restoration of organic polluted soil pollution has become an urgent matter. . Therefore, the development of effective soil remediation techniques with organic matter has been a research focus in the field of environmental rem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 张礼知王小兵陈娜廖敏子
Owner HUAZHONG NORMAL UNIV