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Harmless treatment method for chlorinated organic compounds in soil

A technology for the harmless treatment of chlorinated organic compounds, which is applied in the field of soil remediation and the harmless treatment of chlorinated organic compounds in soil. The effects of high chlorine efficiency, increased degradation rate, and improved treatment degree

Pending Publication Date: 2022-12-02
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of this application is to provide a harmless treatment method for chlorinated organic substances in soil, to solve the problem that new chlorinated organic substances in soil, especially triclosan, are difficult to degrade or have low degradation efficiency

Method used

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  • Harmless treatment method for chlorinated organic compounds in soil
  • Harmless treatment method for chlorinated organic compounds in soil
  • Harmless treatment method for chlorinated organic compounds in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] in accordance with figure 1 As shown in the flowchart, take 1g of triclosan-contaminated soil and add different volumes (5mL, 10mL, 15mL, 20mL, 25mL, 30mL) of 30% hydrogen peroxide (the volume of hydrogen peroxide added at the beginning is the same as that of the contaminated soil The mass ratio is the initial liquid-solid ratio (mL / g), 50mg of sodium hydroxide and 50mL of ultrapure water are placed in a reaction kettle, put into an electric blast drying oven with a set temperature of 180°C, and the reaction time is 120min Finished, let cool.

[0037] Open the reactor, separate all the samples in the reactor from solid to liquid, and add an equal volume of extractant CH to the liquid part. 2 Cl 2The organic matter was extracted, and the aqueous phase and the first organic phase after extraction and separation were collected respectively, and the aqueous phase was quantified to 100 mL. Add the extractant CH to the solid part 2 Cl 2 The organic matter was extracted b...

Embodiment 2

[0042] in accordance with figure 1 In the flow chart given, take 1g of triclosan-contaminated soil and add 25mL of 30% hydrogen peroxide, 50mg of sodium hydroxide and 50mL of ultrapure water into the reactor, and put it into ℃ electric blast drying oven, the reaction time is 30min, 60min, 90min, 120min, 140min, after the timing is over, cool down.

[0043] Open the reactor, separate all the samples in the reactor from solid to liquid, and add an equal volume of extractant CH to the liquid part. 2 Cl 2 The organic matter was extracted, and the aqueous phase and the first organic phase after extraction and separation were collected respectively, and the aqueous phase was quantified to 100 mL. Add the extractant CH to the solid part 2 Cl 2 The organic matter was extracted by a shaker and ultrasound, and the above operation was repeated three times to obtain a solid phase and a second organic phase, and the above two organic phases were mixed. The organic phase was filtered a...

Embodiment 3

[0046] in accordance with figure 1 In the flow chart given, take 1g of triclosan-contaminated soil and add 25mL of 30% hydrogen peroxide, 50mg of sodium hydroxide and 50mL of ultrapure water into the reactor, and put it into ℃ electric blast drying oven, time 120min, and cool down. Open the reactor, separate all the samples in the reactor from solid to liquid, and add an equal volume of extractant CH to the liquid part. 2 Cl 2 The organic matter was extracted, and the aqueous phase and the first organic phase after extraction and separation were collected respectively, and the aqueous phase was quantified to 100 mL. Add the extractant CH to the solid part 2 Cl 2 The organic matter was extracted by a shaker and ultrasound, and the above operation was repeated three times to obtain a solid phase and a second organic phase, and the above two organic phases were mixed. The organic phase was filtered and analyzed by GC-MS. After the water phase product has been fixed to volum...

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Abstract

The invention relates to a harmless treatment method for chlorinated organic compounds in soil, which comprises the following steps: mixing a certain mass of triclosan-polluted soil with a certain volume of ultrapure water, hydrogen peroxide and a basic catalyst, putting the mixed material into a reaction kettle, heating to a preset temperature, and reacting for a period of time. According to the treatment method, on the basis of an original hydrothermal oxidation method, an alkaline substance is added to carry out improved catalytic treatment on the triclosan contaminated soil, and strong-oxidizing-property. OH is generated to dechlorinate triclosan in the soil and convert the triclosan into a low-toxicity or non-toxic intermediate product; the harmless treatment degree is improved, low-chlorine and chlorine-free intermediate products are generated in the degradation process, and the overall dechlorination efficiency is high. The treatment method mainly aims at various chlorinated organic compounds represented by triclosan in the soil, is a green treatment technology with wide applicability and high degradation efficiency, and is of great significance to efficient green restoration and environmental protection of chlorinated organic pollutants in the soil.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a soil restoration technology, in particular to a harmless treatment method for chlorinated organic matter in soil. Background technique [0002] With the rapid development of my country's economy and the continuous expansion of urbanization and industrialization, the use of chlorinated organic compounds has gradually become more and more widespread, and they are used in chemical, biopharmaceutical, and pesticide production facilities. After entering the environment, chlorinated organic compounds can be detected in polluted air, water environment and soil medium, and exist in the environment for a long time, with environmental persistence, bioaccumulation, long-distance migration ability and biohazardous. Among them, triclosan (2,4,4-trichloro-2-hydroxydiphenyl ether, triclosan, TCS), as a common antibiotic, belongs to typical PPCPs chemicals (ie pharmaceuticals and personal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 史瑞胡亚菲章荣陈禹霜骆虹君
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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