Ionic membrane reinforced electric-oxidation repair method of organic polluted soil

A technology of organic pollution and oxidation repair, applied in the restoration of contaminated soil, etc., can solve the problems affecting the subsequent use of soil, changing the basic properties of soil, etc., and achieve the effect of reducing impact, reducing loss, simple and convenient use and replacement

Inactive Publication Date: 2017-10-24
INST OF SOIL SCI CHINESE ACAD OF SCI
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Problems solved by technology

Cang's paper (Chemosphere, 2013, 90: 2326-2331) adopts the addition of persulfate at the cathode, and at the same time controls the catholyte to be acidic (pH=3.5) to change the reducing atmosphere in the cathode area to an oxidizing atmosphere, thereby reducing the persulfate. The loss of salt improves the removal efficiency of organic pollutants, but the above-mentioned practice causes the soil pH to drop to about 2.0, which obviously changes the basic properties of the soil and affects the subsequent use of the soil

Method used

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  • Ionic membrane reinforced electric-oxidation repair method of organic polluted soil
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  • Ionic membrane reinforced electric-oxidation repair method of organic polluted soil

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: In the quartz sand system, the impact of ion-exchange film on the migration of persulfate

[0022] figure 1 It is a schematic diagram of an electro-oxidation restoration device strengthened by an ion membrane, in which the soil is placed in the middle of the soil column 2, and the soil and the solution pool are separated by sintered glass. The anode pool is divided into +1 area anode pool and +2 area solution pool by ion exchange membrane, and the cathode pool is divided into -1 area cathode pool and -2 area solution pool. The DC power supply is connected to the electrodes to form a circuit loop. The solution of the anode pool in the +1 area is connected with the anolyte pool through the peristaltic pump, the solution of the solution pool in the +2 area is connected with the anode solution bank through the peristaltic pump, and the solution of the cathode pool in the -1 area is connected with the catholyte pool through the peristaltic pump, The solution ...

Embodiment 2

[0031] Embodiment 2: Ion-exchange film in the soil system is on the migration of persulfate radical and the impact on the removal of organic pollutants

[0032] sampling figure 1 The experimental device is used to carry out the effect of ionic membrane on the migration of persulfate and the removal of organic pollutants in the soil system. The polluted soil comes from a polluted plot of a coal-to-gas plant in Nanjing, and the pollutants are polycyclic aromatic hydrocarbons (PAHs). After the soil is recovered, it is air-dried, and after removing stones and other impurities, it is ground to pass through a 20-mesh sieve. The soil pH (soil-water ratio is 1:5) is 9.07, the EC is 800μS / cm, and the PAHs content is 4.88mg / kg. The soil column test design is shown in Table 3. Before the start of the experiment, use 0.01mol / L NaCl to equilibrate the soil column for 24h, and then replace the required electrolyte. According to the test design in Table 3, 200g / L sodium persulfate soluti...

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Abstract

The invention discloses an ionic membrane reinforced electric-oxidation repair method of organic polluted soil, relates to a reinforced electric-oxidation repair method for removing organic pollutants in soil, and solves the problems of easy generation of a reduction reaction near a cathode by an oxidizing agent, low utilization rate of the oxidizing agent and easy change of basic properties of the soil in a traditional electric-oxidation repair technology. The method comprises the following steps: a cation exchange membrane or an anion exchange membrane is mounted between an electrode and target soil; then, oxidizing agent solution is injected in one side, near the soil, of the ion exchange membrane; and direct-current voltage is applied for treatment by a certain time to finish repair of organic pollution. The method has the following advantages: (1) the loss of the oxidizing agent can be prominently reduced; and additional other chemical reagents are not needed for reinforced repair; (2) the removing efficiency of organic pollutants can be greatly improved; and meanwhile, the energy consumption is reduced; (3) the influence on the soil properties can be reduced; and (4) installation, use and replacement of the ion exchange membrane are simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to an ion membrane-enhanced electrokinetic-oxidation restoration method for organic polluted soil. Background technique [0002] Contaminated soil remediation is a technology that needs to be developed urgently, because soil pollution will cause very serious environmental problems and affect human health and social development. Due to the variety of organic pollutants, volatile nature, and easy migration in soil and water, organic polluted soil is more harmful and difficult to repair than heavy metal polluted soil. [0003] In situ advanced oxidation technology (ISCO) is a widely used in situ remediation technology for organic contaminated soil, which has the advantages of simple operation, high remediation efficiency, and deep treatment depth. The core of in-situ advanced oxidation technology is to inject oxidants (persulfate, potassium permanganate, hydrogen peroxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/085
Inventor 仓龙宋岳徐宏婷周东美
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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