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Method for collaboratively degrading 666 soil by Fe (II)/sodium percarbonate

A sodium percarbonate and synergistic degradation technology, applied in the field of contaminated site restoration, can solve the problems of easy reaction with soil organic matter, easy ineffective decomposition, poor contact efficiency, etc., and achieve the effect of simple process conditions, fast degradation rate and low operation requirements

Inactive Publication Date: 2017-03-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for repairing HCH-contaminated soil by using Fe(II) / sodium percarbonate heterogeneous Fenton-like reaction system, which solves the problem of classic Fenton system in soil due to poor contact efficiency with organic pollutants. Easily react with soil organic matter and H 2 o 2 The problem of easy invalid decomposition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1 and example 2

[0020] In Example 1 and Example 2, the treatment method of the present invention was used to oxidatively degrade BCH in muddy soil. Among them, the HCH content in the muddy soil is extracted by ultrasonic method, and detected and quantitatively analyzed by gas chromatography.

example 1

[0022] Prepare 10 grams of contaminated soil with an α-HCH content of 50 mg / kg, and add 50 mL of water to the soil to make a muddy soil mixture. Add 165 mg of citric acid to the mud-soil mixture to adjust the pH to 13.0, then add 90 mg of sodium percarbonate and 239 mg of ferrous sulfate. The reaction system was placed in a constant temperature shaking box at room temperature and shaken for 24 hours at a speed of 180 r / min. After the reaction is over, add an appropriate amount of isopropanol to the reaction system to quench the reaction. The α-HCH in the soil was extracted by ultrasound, and the BCH in the extract was quantitatively detected by gas chromatography. The results showed that the soil α-HCH degradation rate reached 60%.

example 2

[0024] Prepare 10 g of contaminated soil with a β-HCH content of 40 mg / kg, and add 40 mL of water to the soil to form a muddy soil mixture. Add 150mg of citric acid to the muddy soil mixture to adjust the pH to 9.0, then add 80mg of sodium percarbonate and 230mg of ferrous sulfate. The reaction system was placed in a constant temperature shaking box at room temperature and shaken for 15 hours at a speed of 200 r / min. After the reaction is over, add an appropriate amount of isopropanol to the reaction system to quench the reaction. The β-HCH in the soil was extracted by ultrasound, and the β-HCH in the extract was quantitatively detected and analyzed by gas chromatography. The results showed that the degradation rate of 666 in soil reached 52%.

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Abstract

The invention belongs to the technical field of repair of organic-polluted soil, and discloses a method for collaboratively degrading 666 polluted soil by citric acid assisted Fe (II) / sodium percarbonate. The method comprises the following steps: the 666 polluted soil is mixed as mud-state soil mixed solution according to a certain water-soil ratio; ferrous sulfate and sodium percarbonate are fed in the solution by a certain ratio to oscillate by 6-24 h in a constant-temperature oscillator at normal temperature; and the degrading rate of the treated 666 reaches above 50%. The method has such advantages as simple process conditions, low operation requirements and high treatment efficiency, and is suitable for repairing organic chlorine pesticide polluted soil.

Description

technical field [0001] The invention belongs to the technical field of remediation of contaminated sites, and in particular relates to a method for synergistically degrading BCH in soil by using citric acid to assist Fe(II) / sodium percarbonate. Background technique [0002] In 2009, nine typical organochlorine pesticides including lindane and HC6 were included in the Stockholm Convention, restricting or prohibiting their production, use and circulation in the world. A large number of organochlorine pesticide production workshops were forced to close down, leaving behind a large number of organochlorine pesticide-contaminated sites, which must be properly repaired before they can be redeveloped and utilized. Among them, 666 has the characteristics of high fat solubility, high toxicity, refractory degradation and easy residue. It often remains in the soil for a long time and is difficult to decay naturally, making it one of the most serious disasters in polluted sites. Rapid a...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 姚静波祝孔亮王明新刘建国张文艺
Owner CHANGZHOU UNIV
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