Method of restoring organic polluted soil through electro-thermal activation of persulfate

A technology for activating persulfate and organic pollution, applied in the field of soil remediation, can solve problems such as low heat transfer efficiency, secondary pollution of the environment, and increased repair costs, and achieve the effect of low temperature, efficient repair, and uniform distribution

Active Publication Date: 2020-03-27
HEBEI UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

At present, the problem of heat-activated persulfate oxidation of soil organic pollutants is mainly due to low heat transfer efficiency and high energy consumption. Due to the resistance of soil mass transfer, it is difficult for persulfate to fully contact with pollutants. During the repair process, excessive persulfuric acid needs to be added. Salt agents lead to higher repair costs, and there are excessive sulfates in the environment after restoration, causing secondary pollution to the environment

Method used

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  • Method of restoring organic polluted soil through electro-thermal activation of persulfate

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Effect test

Embodiment 1

[0030] The contents of naphthalene, phenanthrene, anthracene and benzo(a)pyrene in an organic polluted soil were 100mg / kg, 75mg / kg, 110mg / kg and 170mg / kg respectively. The electrodes of the electrode heating system are arranged as a regular triangle with a side length of 0.4m, and the electrode array layout depth is 0.5m below the treated soil. The soil organic matter content is 3.5%, and the sodium persulfate solution with a mass concentration of 25% is injected into the organic polluted soil. According to the soil pollution (water geological conditions, pollutant distribution), the electrode voltage amplitude, phase, and frequency are adjusted to form a rotating electric field to regulate the action point of persulfate in the soil. Raise the soil temperature to 35°C by alternating current, activate persulfate, release sulfate radicals, and oxidize organic pollutants in the soil. The contents of naphthalene, phenanthrene, anthracene and benzo(a)pyrene in the remediation soil...

Embodiment 2

[0032] The contents of naphthalene, phenanthrene, anthracene and benzo(a)pyrene in an organic polluted soil were 110mg / kg, 80mg / kg, 97mg / kg and 160mg / kg respectively. The electrodes of the electrode heating system are arranged as a regular triangle with a side length of 0.4m, and the electrode array layout depth is 0.5m below the treated soil. The soil organic matter content is 3.5%, and the sodium persulfate solution with a mass concentration of 25% is injected into the organic polluted soil. According to the soil pollution, the electrode voltage amplitude, phase, and frequency are adjusted to regulate the action point of persulfate in the soil. The soil temperature is raised to 38°C by alternating current to activate persulfate, release sulfate radicals, and oxidize organic pollutants in the soil. The contents of naphthalene, phenanthrene, anthracene and benzo(a)pyrene in the remediation soil were 2.2mg / kg, 2.4mg / kg, 4.85mg / kg and 8mg / kg respectively, and the removal rates ...

Embodiment 3

[0034]An organic polluted soil contains 700mg / kg and 420mg / kg of toluene and xylene respectively. The electrodes of the electrode heating system are arranged as a regular triangle with a side length of 0.4m, and the electrode array layout depth is 0.5m below the treated soil. The soil organic matter content is 3%, and the sodium persulfate solution with a mass concentration of 20% is injected into the organic polluted soil. According to the soil pollution, the electrode voltage amplitude, phase, and frequency are adjusted to regulate the action point of persulfate in the soil. Raise the soil temperature to 35°C by alternating current, activate persulfate, release sulfate radicals, and oxidize organic pollutants in the soil. The contents of toluene and xylene in the remediation soil were 26mg / kg and 21mg / kg respectively, and the removal rates were 96% and 95%, respectively. After the repair is completed, the sulfate radical is targeted to be enriched and collected through the...

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Abstract

The invention relates to a method of restoring organic polluted soil through electro-thermal activation of persulfate. According to the method, an electric field of an electrode heating system drivescontrollable distribution of an oxidant in soil; through an electro-thermal field formed in the electrode heating system, persulfate is activated to efficiently remove organic pollutants, and at the same time, the using amount of persulfate is reduced. The invention provides a novel method of efficiently restoring organic pollutant soil in an energy saving mode.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for electrothermally activating persulfate to remediate organic polluted soil. Background technique [0002] Toxic and harmful organic pollutants in the soil environment, such as polycyclic aromatic hydrocarbons, halogenated hydrocarbons, petroleum hydrocarbons, etc., have serious harm to the environment and human health. [0003] In the remediation of organic contaminated soil, in-situ chemical oxidation remediation has the advantages of avoiding soil transfer and short cycle time, and is a commonly used method for remediation of organic contaminated sites. The activity of the oxidant directly affects the repair effect of in-situ chemical oxidation. Persulfate itself has strong oxidizing properties, and its hydrolysis produces persulfate (S 2 o 8 2- ), using various conditions to stimulate the sulfate radicals that can generate stronger oxidative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/085
Inventor 马小东王菲
Owner HEBEI UNIV OF TECH
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