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Electric restoration method and device utilizing salt bridge to improve soil organic pollutant removal

A technology of organic pollutants, electric repair, applied in the field of environmental remediation, can solve problems such as affecting electric field oxidation, achieve good removal effect and improve removal efficiency.

Active Publication Date: 2015-06-24
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional soil electrokinetic restoration process, the cathode and anode are in the same electrokinetic restoration chamber, and the H+ and OH- generated by the electrode reaction at the anode and cathode will undergo neutralization reactions in the soil, affecting the electric field to exert its maximum oxidation effect

Method used

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  • Electric restoration method and device utilizing salt bridge to improve soil organic pollutant removal
  • Electric restoration method and device utilizing salt bridge to improve soil organic pollutant removal
  • Electric restoration method and device utilizing salt bridge to improve soil organic pollutant removal

Examples

Experimental program
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Effect test

Embodiment 1

[0024] experimental device:

[0025] The present invention utilizes the electric restoration device of salt bridge to comprise electrode anode 1, electrode cathode 2, salt bridge 3, anode chamber 4, cathode chamber 5, relay 6, regulator 7 and power source 8; Wherein, electrode anode 1 and electrode cathode 2 are respectively Inserted into the anode chamber 4 and the cathode chamber 5 connected by the salt bridge 3, the electrode anode 1 and the electrode cathode 2 are connected to the power supply 8 through the relay 6, and the regulator 7 is connected to the power supply 8 and the relay 6 (see figure 1 ). The device performs electrode polarity switching through a relay 6 and a regulator 7 .

[0026] The traditional electric repair device includes electrode anode 1, electrode cathode 2, soil chamber 3, relay 4, regulator 5 and power supply 6; wherein, electrode anode 1 and electrode cathode 2 are respectively inserted into two ends of the soil chamber, and electrode anode 1 a...

Embodiment 2

[0033] experimental device:

[0034] The experimental device used in this embodiment is the same as in Example 1.

[0035] Specific implementation steps:

[0036] The soil used in the test was undisturbed polluted soil, which was PAH-contaminated soil in a coking site, and the total concentration of PAHs in the soil was controlled by 16 kinds of EPA priority to 5600 mg / kg.

[0037] There are 4 treatments in this embodiment, and treatment 1 and treatment 2 use traditional electric restoration devices ( figure 2 ), the yin and yang remediation areas of the soil chamber are not separated, in the same soil chamber, the volume of the soil chamber is 30cm×10cm×5cm, the electrode polarity is not switched in treatment 1, and the electrode polarity is switched every 4 hours in treatment 2; treatment 3 and Process 4 adopts the electric restoration device utilizing the salt bridge of the present invention ( figure 1 ), the electric remediation area of ​​yin and yang polluted soil is ...

Embodiment 3

[0041] The soil used in the experiment was petroleum-contaminated soil, and the petroleum hydrocarbon content in the soil was 5%. This embodiment is basically the same as Embodiment 2. After 60 days of treatment, the petroleum hydrocarbon content in the soil was determined by gravimetric method. Figure 5 It was shown that the final removal rate of petroleum hydrocarbons reached 20.7% (treatment 1), 32.3% (treatment 2), 35.6% (treatment 3) and 51.3% (treatment 4), and the salt bridge enhanced electrokinetic repair method was better than the traditional electrokinetic restoration method (without switching treatment). An increase of 14.9%-19.0%. The removal rate of petroleum hydrocarbons increased by 15.7% when using the salt bridge polarity switching treatment compared with the non-switching treatment.

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Abstract

The invention belongs to the technical field of environment restoration and relates to an electric restoration method and device utilizing a salt bridge to improve soil organic pollutant removal. The electric restoration method is characterized in that a cathode polluted soil electric restoration zone and an anode polluted soil electric restoration zone are constructed in polluted soil to be treated, an anode is arranged in the anode polluted soil electric restoration zone, a cathode is arranged in the cathode polluted soil electric restoration zone, the anode is connected to the cathode by a lead, the anode and cathode apply an electric field and realizes switching / non-switching of electrode polarity, and the anode polluted soil electric restoration zone is connected to the cathode polluted soil electric restoration zone by a salt bridge. The salt bridge separates the anode polluted soil electric restoration zone and the cathode polluted soil electric restoration zone, is conducive to anode zone acidic environment keeping and improves removal efficiency of the organic pollutants in the anode polluted soil electric restoration zone. Through a cathode-anode polarity switching mode, the total removal efficiency of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration, and in particular relates to an electric restoration method and a device thereof which utilize a salt bridge to strengthen the removal of soil organic pollutants. Background technique [0002] Industrial development has brought more and more organic pollutants into the soil environment. Pollutants that are difficult to biodegrade will remain in the soil for a long time and continue to migrate and transform, bringing great hidden dangers. Therefore, the removal of organic pollutants in soil, especially refractory organic pollutants, has become a research hotspot in the field of environment. Aiming at the status quo of soil pollution, people have developed a variety of remediation technologies. At present, organic contaminated soil remediation technologies include thermal desorption, microwave heating, steam extraction, chemical leaching, chemical oxidation and biodegradation, et...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 郭书海李凤梅徐素娟吴波李刚
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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