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Organic polluted site soil in-situ chemical oxidation repairing method based on iron cycling regulation

An in-situ chemical oxidation and organic pollution technology, applied in the field of environmental chemistry, to achieve the effects of wide application range, environmental friendliness and mild reaction conditions

Active Publication Date: 2017-07-25
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for in-situ chemical oxidation repair of organically polluted site soil based on iron cycle regulation in order to address the above-mentioned deficiency of adding ferrous ion oxidation repair method

Method used

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  • Organic polluted site soil in-situ chemical oxidation repairing method based on iron cycling regulation
  • Organic polluted site soil in-situ chemical oxidation repairing method based on iron cycling regulation
  • Organic polluted site soil in-situ chemical oxidation repairing method based on iron cycling regulation

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1 Remediation of Chloronitrobenzene Contaminated Site Soil

[0039] The soil of the organic contaminated site was taken from the chloronitrobenzene contaminated site of an abandoned chemical plant. After sampling, the contaminated soil was freeze-dried, crushed, and ground to form a uniform soil sample. The main organic pollutants in the contaminated soil were determined by mass spectrometry to be o-chloronitrobenzene and p-chloronitrobenzene.

[0040] For the remediation of chloronitrobenzene-contaminated soil, add 1mL of ascorbic acid and hydrogen peroxide mixed solution to 1g of soil, so that the concentrations of ascorbic acid and hydrogen peroxide are 10mmol / L and 200mmol / L, respectively, without additional pH adjustment. place. At the same time, no ascorbic acid and hydrogen peroxide, only ascorbic acid or only hydrogen peroxide were used as control experiments. The concentrations of ascorbic acid and hydrogen peroxide in the control experiment were 10...

Embodiment 2

[0041] Example 2 Restoration of Chloronitrobenzene Contaminated Site Soil under Different Ascorbic Acid Concentrations

[0042] The soil of the organic contaminated site was taken from the chloronitrobenzene contaminated site of an abandoned chemical plant. After sampling, the contaminated soil was freeze-dried, crushed, and ground to form a uniform soil sample. It was determined by mass spectrometry that the contaminated soil contained o-chloronitrobenzene and p-chloronitrobenzene.

[0043]For the remediation of chloronitrobenzene-contaminated site soil, add 1mL of ascorbic acid and hydrogen peroxide mixed solution to 1g of soil, so that the concentration of hydrogen peroxide is 200mmol / L, and the concentration of ascorbic acid is 2, 5, 10 and 20mmol respectively / L, no need to adjust the pH, stand still, monitor the degradation of o-chloronitrobenzene and p-chloronitrobenzene respectively, the results are shown in image 3 and Figure 4 . image 3 As shown, as the initial...

Embodiment 3

[0044] Embodiment 3 Remediation of Chloronitrobenzene Contaminated Site Soil under Different Hydrogen Peroxide Concentrations

[0045] The soil of the organic contaminated site was taken from the chloronitrobenzene contaminated site of an abandoned chemical plant. After sampling, the contaminated soil was freeze-dried, crushed, and ground to form a uniform soil sample. It was determined by mass spectrometry that the contaminated soil contained o-chloronitrobenzene and p-chloronitrobenzene.

[0046] For the remediation of chloronitrobenzene-contaminated site soil, add 1mL of ascorbic acid and hydrogen peroxide mixed solution to 1g of soil, so that the concentration of ascorbic acid is 10mmol / L, and the concentration of hydrogen peroxide is 100, 200, 500 and 1000mmol respectively / L, no need to adjust the pH, let it stand still. Simultaneously with not adding ascorbic acid as control test, monitor respectively the degradation situation of o-chloronitrobenzene and p-chloronitrob...

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Abstract

The invention relates to an organic polluted site soil in-situ chemical oxidation repairing method based on iron cycling regulation. The organic polluted site soil in-situ chemical oxidation repairing method comprises the steps that a mixed solution of natural organic small molecules and hydrogen peroxide is added into to-be-repaired organic polluted site soil; iron minerals naturally existing in the soil is activated through the natural organic small molecules to serve as effective iron sources for decomposing the hydrogen peroxide; and the hydrogen peroxide is efficiently decomposed into hydroxyl free radicals, so that organic polluted site soil in-situ chemical oxidation repairing is achieved. According to the organic polluted site soil in-situ chemical oxidation repairing method based on iron cycling regulation, the iron minerals naturally existing in the soil is activated through the natural organic small molecules, so that the problem that ferrous ions need to be additionally added in a traditional hydrogen peroxide chemical oxidation technology is solved, and the mass transfer problem caused by direct contact between the hydroxyl free radicals produced through hydrogen peroxide decomposition and organic pollutants in the soil is solved; and the method is used for in-situ chemical oxidation repairing of the organic matter polluted soil and has the advantages of being efficient, non-selective, savable in cost, environmentally friendly, free of secondary pollution, and the like.

Description

technical field [0001] The invention belongs to the field of environmental chemistry, and in particular relates to a method for controlling and repairing organic pollutants in soil, which is suitable for repairing organic polluted soil in the fields of printing and dyeing, industry, agriculture and the like. Background technique [0002] Soil is an important natural resource on the earth and the basis for the survival and development of life. With the rapid growth of my country's population and the rapid development of industry and agriculture, a large amount of harmful wastewater and solid waste are continuously discharged into nature, resulting in increasingly prominent problems of soil pollution. Among them, the pollutants in organic polluted soil are of various types, and most of them are highly toxic and difficult to degrade under natural conditions, posing a major threat to the sound operation of the entire ecological environment. [0003] The most notable feature of ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 张礼知侯晓静黄小鹏
Owner HUAZHONG NORMAL UNIV
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