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Low-temperature plasma processing device and method for persistent organic pollutants in soil

A technology of low-temperature plasma and organic pollutants, applied in the field of remediation of organic polluted soil, to achieve the effect of small equipment investment, low treatment cost and high efficiency

Active Publication Date: 2014-12-24
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Technical problem to be solved: This application provides a low-temperature plasma treatment device and method with good remediation effect for heavily persistent organic matter-contaminated soil (especially site-contaminated soil)

Method used

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  • Low-temperature plasma processing device and method for persistent organic pollutants in soil
  • Low-temperature plasma processing device and method for persistent organic pollutants in soil
  • Low-temperature plasma processing device and method for persistent organic pollutants in soil

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The low-temperature plasma treatment method of soil persistent organic pollutants of the present invention mainly comprises: the first step, puts the naturally air-dried contaminated soil after screening into the reactor, and makes it evenly cover the bottom of the reactor container 1, and then The reactor cover plate 2 is covered on the reactor container 1; in the second step, the reactor is placed on the ground electrode 3, and the height of the high-voltage electrode 6 is adjusted by rotating the nut 5 of the stainless steel support rod 4 to make it close to the reactor Then tighten the nuts 8 on both sides of the insulating plate 7 to keep it fixed; in the third step, if it is necessary to create a discharge atmosphere other than air, the required atmosphere can enter the reaction system through the reactor inlet 9, Discharge through the air outlet 10 again; the fourth step is to connect the upper terminal 11 on the insulating plate 7 of the polytetrafluoroethylene m...

Embodiment 2

[0029] A low-temperature plasma treatment device for soil persistent organic pollutants, including a reactor and a reaction table, the reactor is composed of a reactor container 1 and a reactor cover 2, and an air inlet is provided on the reactor container 9 and the gas outlet 10, the reactor cover plate 2 is located on the reactor container 1; the reaction table includes an insulating plate 7, a conductive base 13, a low-temperature plasma power supply 12 and a fan 15, and the conductive base 13 is provided with a support rod 4, The insulating plate 7 is arranged on the supporting rod 4, the insulating plate 7 is provided with a high-voltage electrode 6 and an upper terminal 11, the conductive base 13 is provided with a grounding electrode 3 and a lower terminal 14, and the high-voltage electrode 6 and the grounding electrode 3 are arranged oppositely. The fan 15 is set towards the electrodes, the upper terminal 11 is connected to the low-temperature plasma power supply 12 , t...

Embodiment 3

[0031]Same as Example 2, a low-temperature plasma treatment device for soil persistent organic pollutants, including a low-temperature plasma power supply, two stainless steel discharge electrodes, a reaction kettle and an external cooling fan. The reaction kettle is placed between two stainless steel electrodes, and the three are closely attached. The output power of the low-temperature plasma power supply is 0-2kW, the frequency adjustment range is 5-30kHz, and the output voltage adjustment range is 0-30kV. The discharge electrode is a stainless steel cylinder with a diameter of 150 mm and a thickness of 26 mm. Five grooves are designed on the periphery of the side wall of the electrode. This design increases the surface area of ​​the electrode and facilitates the heat dissipation of the electrode during the discharge process. The discharge electrode is composed of a high-voltage electrode and a ground electrode, wherein the high-voltage electrode fixed on the polytetrafluor...

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Abstract

A low-temperature plasma processing device and a method for persistent organic pollutants in soil are disclosed. The device comprises a reaction kettle and a reaction stage. The reaction kettle consists of a reaction kettle container provided with a gas inlet and a gas outlet, and a reaction kettle cover plate arranged on the reaction kettle container. The reaction stage comprises an insulation plate, a conductive base, a low-temperature plasma power supply and a fan; the conductive base is provided with a strut, a ground electrode and a lower binding post, the insulation plate is arranged on the strut and provided with a high voltage electrode and an upper binding post, the high voltage electrode and the ground electrode are arranged oppositely, the fan is arranged toward the electrodes, the upper binding post is connected with the low-temperature plasma power supply, the lower binding post is connected with a ground wire, and the reaction kettle is arranged between the high voltage electrode and the ground electrode. The processing device is simple in operation, high in pollutant removal efficiency, small in device investment and low in processing cost, and is suitable for a small-scale test on the recovery of persistent organic pollution soil.

Description

technical field [0001] The invention belongs to the technical field of remediation of organic polluted soil, and in particular relates to a low-temperature plasma treatment device and method for soil persistent organic pollutants. Background technique [0002] Persistent Organic Pollutants (POPs) are mainly divided into three categories: pesticides (aldrin, chlordane, DDT, etc.), industrial chemicals (polychlorinated biphenyls and hexachlorobenzene) and production by-products (dioxins and furans). In recent years, pesticides and industrial chemicals have been widely used in my country's industrial and agricultural production. Because these substances are highly toxic, difficult to degrade, and easy to accumulate, their residues can be detected in most farmland soils and industrial lands in my country, posing potential hazards to human safety. Therefore, it has attracted widespread attention. [0003] POPs refer to long-distance migration and long-term existence in the env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/06
Inventor 骆永明陈海红滕应罗飞宋静刘五星
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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