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Electro-thermal coupling chemical oxidation method and device

A technology of chemical oxidation and electrothermal coupling, which is applied in the field of soil remediation, can solve the problems of low oxidant activation efficiency and poor mass transfer in low-permeability formations, achieve high oxidant activation efficiency, eliminate dead corners of agent transmission, and reduce heating energy consumption.

Pending Publication Date: 2020-06-16
ZHONGKE DINGSHI ENVIRONMENTAL ENG CO LTD
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Problems solved by technology

[0006] In order to solve the problems of poor mass transfer in low-permeability formations and low activation efficiency of oxidants in in-situ chemical oxidation technology, the present invention provides an electrothermal coupling chemical oxidation method and device

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  • Electro-thermal coupling chemical oxidation method and device
  • Electro-thermal coupling chemical oxidation method and device
  • Electro-thermal coupling chemical oxidation method and device

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Embodiment Construction

[0041] like figure 1 As shown, the present invention provides an electrothermal coupling chemical oxidation device, including an oxidant preparation and injection unit 1, a monitoring control unit 2 and a power regulation unit 3, wherein:

[0042] The oxidant preparation and injection unit 1 includes an oxidant storage and stirring tank 11, a pressurized injection pump 12, and an electrode injection integrated well 13. The electrode injection integrated well 13 is made of corrosion-resistant metal, and can be used as an oxidant injection well or as an oxidant injection well. Electrodes are used to introduce direct current or alternating current into the ground;

[0043] The monitoring control unit 2 includes a monitoring well 21, a detector (capable of detecting oxidation-reduction potential, pH value, electrical conductivity, water content and / or temperature, etc. in the soil), a display and a memory (not shown), and is configured with Intelligent "positive and negative pola...

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Abstract

The invention provides an electro-thermal coupling chemical oxidation method and device. The device comprises an oxidizing agent preparation and injection unit, a monitoring control unit and an electric power adjusting unit. The oxidizing agent preparation and injection unit can inject an oxidizing agent into contaminated soil. The monitoring control unit can detect the change conditions of the conductivity and the oxidation-reduction potential in the contaminated soil. The electric power adjusting unit comprises an isolation voltage regulator, a rectifier and a change-over switch, the input end of the isolation voltage regulator is connected with an alternating current power supply, and the output end of the isolation voltage regulator is selectively and directly connected with an electrode in the contaminated soil through the change-over switch or selectively connected with the electrode through the rectifier, so that alternating current or direct current is transmitted to the electrode. According to the method, direct current is firstly introduced to directionally migrate the oxidizing agent, and then alternating current is introduced to activate the oxidizing agent under the heating action of an alternating current electric field, so that the polluted soil is efficiently oxidized.

Description

technical field [0001] The invention relates to the technical field of soil restoration. Background technique [0002] In-situ chemical oxidation technology is an efficient in-situ remediation technology suitable for treating source areas. By injecting oxidants into soil or groundwater contaminated areas, the oxidants will oxidize in contact with pollutants, so that pollutants can be transformed into non-toxic or relatively less toxic The material has the characteristics of good economy, quick repair and remarkable effect. However, for low-permeability formations, there is the problem of poor mass transfer of oxidants. Since the transmission and diffusion of oxidants are affected by the permeability of the soil, sufficient contact between oxidants and pollutants cannot be achieved, resulting in poor in-situ chemical oxidation effects. [0003] Sodium persulfate is a new type of oxidizing agent with strong oxidation ability (E 0 =2.01V), many types of pollutants to be treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/002B09C1/085B09C2101/00
Inventor 周广东刘爽牛静张景鑫金增伟黄海杨勇王海东殷晓东张程
Owner ZHONGKE DINGSHI ENVIRONMENTAL ENG CO LTD
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