Method for remedying organic contaminated soil through electric diffusion-electric heating coupling

A technology for soil and organic pollution remediation, applied in the restoration of polluted soil and other directions, can solve problems such as low utilization rate, and achieve the effect of rapid migration, in-situ controllable and efficient activation

Inactive Publication Date: 2018-01-12
陆隽鹤 +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Furthermore, with H 2 o 2 In contrast, persulfate will not cause low utilization rate due to volatilization and other reasons
[0005] However, in the practical application of ISCO technology, the key factor that restricts the treatment efficiency and effect is often not the oxidizing ability of chemical reagents, but how to promote the rapid and effective migration of oxidants to polluted soil, so as to fully contact with pollutants

Method used

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  • Method for remedying organic contaminated soil through electric diffusion-electric heating coupling
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  • Method for remedying organic contaminated soil through electric diffusion-electric heating coupling

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Effect test

Embodiment 1

[0029] 1) Setting of electrodes and dosing wells

[0030] According to the distribution of pollutants in the soil, along the pollution zone, insert multiple graphite rods into the soil, alternately set as cathode and anode, the distance between two adjacent anodes is 0.5-1.5 meters, and the distance between two adjacent cathodes is 0.5-1.5 meters, and the distance between adjacent yin and yang poles is 5-10 meters. In the middle of the electric field, set up a dosing well, which is parallel to the anode and spaced from the cathode, and the wire is connected to the electrode and the DC power supply; according to the scope of soil pollution, multiple sets of parallel electrodes are set. The electrode depth is consistent with the soil contamination depth. The electrode material is graphite rod or titanium mesh; the site setting is as follows figure 1 shown.

[0031] 2) Migration of oxidant in soil

[0032] Inject sodium persulfate solution and 100-10g / L sodium chloride soluti...

Embodiment 2

[0037] Prepare 10g / L sodium persulfate solution, 10g / L potassium permanganate solution and 10% sodium chloride solution in advance.

[0038] 1. Collect the soil in a certain area of ​​Nanjing, air-dry the soil, remove stones and plant residues, grind them evenly, and adjust the moisture content to 20%.

[0039] 2. Put the soil into a 5cm×5cm×20cm mold and put it into a rectangular glass box reactor. The soil is filled with quartz sand, and the mold is carefully pulled out. Set up two identical soil sample areas in the same reactor. Graphite electrodes were inserted between the two soil samples and at both ends of the reaction box, with the cathode in the middle and the anode at both ends. And connected to the AC power supply, the electric field strength is set to 1V / cm.

[0040] 3. The dosing well is also set between the two soil areas and separated from the cathode. Inject potassium permanganate solution or persulfate into the dosing well and turn on the power. Potassium...

Embodiment 3

[0043] The soil of the polluted site in the suburbs of Nanjing was collected, and the main pollutant was nitrobenzene, with a concentration as high as 100 mg / kg or more. According to the method of embodiment 2, put the soil sample evenly into the reactor (20cm×20cm×40cm), insert graphite electrodes at both ends and the middle of the reactor respectively, wherein the electrode in the middle is connected to the negative pole of the power supply, and the two ends are positive poles. Inject 10g / L sodium persulfate solution and 10g / L NaCl solution into the dosing well, adjust the electric field strength to 1V / cm, and keep it for 30 days to wait for the diffusion of oxidants. Then switch to an AC electric field, adjust the electric field strength to 500V / m, and make the current reach 0.5 ampere. After reacting for 5 days, samples were taken to analyze the residue of nitrobenzene. The data showed that the degradation rate of nitrobenzene reached 78%. However, no degradation occurre...

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Abstract

The invention discloses a method for remedying organic contaminated soil through electric diffusion-electric heating coupling. According to the method, a direct-current electric field is applied to achieve directed migration of persulfate molecules in the contaminated soil; and after persulfate migrates to a target contaminated area, an alternating-current electric field is adopted, and heat generated by currents is used for in-situ activation of the persulfate, so that sulfate radical anions with the strong oxidizing property are generated to degrade pollutants. By adoption of the method, directed and rapid migration of an oxidizing agent, namely the persulfate, in soil can be achieved, and meanwhile, controllable efficient in-situ activation of the persulfate in soil can also be achieved.

Description

Technical field: [0001] The invention belongs to the technical field of environmental protection, relates to the restoration of soil organic pollution, and in particular relates to a method for repairing soil organic pollution coupled with electrodynamic diffusion and electric heating. Background technique: [0002] Soil pollution caused by industrial emissions, mining, transportation, etc. has become an important factor restricting the sustainable development of my country's economy and society. Treatment methods for contaminated soil include landfill, incineration, high-temperature desorption, soil leaching, chemical oxidation, and microbial remediation, among which the in-situ chemical oxidation (ISCO) technology has become a Main methods of groundwater and soil remediation. In-situ chemical oxidation remediation technology is a contaminated soil remediation technology mainly through the oxidation reaction between chemical oxidants mixed into the soil and pollutants to d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/06
Inventor 陆隽鹤舒茂
Owner 陆隽鹤
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