Method and device for electrically recovering phenol-contaminated soil by using three-dimensional porous carbon electrode

An electric remediation, three-dimensional porous technology, which is applied in the field of remediation of organic-contaminated soil, can solve the problems of incompatibility, lack of flexibility, dead angle of electric field, etc., and achieve the effect of eliminating dead angle of electric restoration, realizing effective repair, and eliminating dead angle of electric field.

Inactive Publication Date: 2013-02-13
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inhomogeneity of the electric field generated by the one-dimensional electrode will lead to "electric field dead angle". Although the two-dimensional plate electrode can solve the inhomogeneity of the electric field to a certain extent, the plate electrode is like a wall to prevent the further migration of phenol and diffusion
Although some researchers have proposed the use of perforated graphite electrodes for electrodynamic repair, it is still difficult to meet the needs of practical applications because perforated graphite electrodes are rigid, lack flexibility and are easily broken, difficult to construct, and cannot adapt to the requirements of different shapes of sites.

Method used

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  • Method and device for electrically recovering phenol-contaminated soil by using three-dimensional porous carbon electrode
  • Method and device for electrically recovering phenol-contaminated soil by using three-dimensional porous carbon electrode
  • Method and device for electrically recovering phenol-contaminated soil by using three-dimensional porous carbon electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1 Use 2Kg of phenol with a concentration of 200mg / kg to simulate the soil, and add enough water to just submerge the soil, apply a constant voltage at room temperature, so that the potential gradient is 1.5V / cm, and last for 12 days, every other day at 1 , No. 2, 3, 4, and 5 sites were sampled to analyze their concentrations. Driven by the electric field, the water level in the anode area drops and the water level in the cathode area rises. Add 200ml of saturated Ca(OH) every 24h in the anode area from the next day 2 solution, neutralizes the generated hydrogen ions, and replenishes water. Collect the aqueous solution (about 200ml) in the cathode area, and add 200ml to the cathode area every 24h with a concentration of 5×10 -2 mol / L oxalic acid solution. The change curve of phenol concentration at each point with time is shown in Fig. 3 . It can be seen from the figure that the concentration of 3 sites (sites 2, 3, and 4) in the soil decreased signific...

Embodiment 2

[0054] Example 2 2Kg of phenol with a concentration of 100mg / kg was used to simulate the soil, and enough water was added to make it just submerge the soil, and a constant voltage was applied at room temperature to make the potential gradient 1.5V / cm for 12 days, and every other day at 1 , No. 2, 3, 4, and 5 sites were sampled to analyze their concentrations. Driven by the electric field, the water level in the anode area drops and the water level in the cathode area rises. Add 200ml of saturated Ca(OH) every 24h in the anode area from the next day 2 solution, neutralizes the generated hydrogen ions, and replenishes water. Collect the aqueous solution (about 200ml) in the cathode area, and add 200ml to the cathode area every 24h with a concentration of 5×10 -2 mol / L oxalic acid solution. Similar to Example 1, the concentrations of 3 sites (sites 2, 3, and 4) in the soil decreased significantly after 12 days, while the concentration of site 5 increased significantly. ...

Embodiment 3

[0055] Example 3 2Kg of phenol with a concentration of 300mg / kg was used to simulate the soil, and enough water was added to make it just submerge the soil, and a constant voltage was applied at room temperature, so that the potential gradient was 1.5V / cm, for 12 days, and every other day at 1 , No. 2, 3, 4, and 5 sites were sampled to analyze their concentrations. Driven by the electric field, the water level in the anode area drops and the water level in the cathode area rises. Add 200ml of saturated Ca(OH) every 24h in the anode area from the next day 2 solution, neutralizes the generated hydrogen ions, and replenishes water. Collect the aqueous solution (about 200ml) in the cathode area, and add 200ml to the cathode area every 24h with a concentration of 5×10 -2 mol / L oxalic acid solution. Similar to Example 1, the concentrations of 3 sites (sites 2, 3, and 4) in the soil decreased significantly after 12 days, while the concentration of site 5 increased significan...

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Abstract

The invention discloses a method and a device for electrically recovering phenol-contaminated soil by using a three-dimensional porous carbon electrode. The technical scheme comprises (1) adopting the flexible three-dimensional porous carbon electrode to serve as a positive electrode and a negative electrode respectively; (2) placing the positive electrode and the negative electrode in a positive electrode area and a negative electrode area of an electrokinetic remediation tank, respectively filling soil-free neutral aqueous solution in the positive electrode area and the negative electrode area, and filling soil to be recovered between the positive electrode area and the negative electrode area; (3) exerting direct voltage which enables phenol to move towards the negative electrode area between the positive electrode area and the negative electrode area; (4) respectively replenishing Ca(OH)2 and oxalate in the positive electrode area and the negative electrode area; and (5) removing the aqueous solution in the negative electrode area after all the phenol in the soil to be recovered converges to the negative electrode area, and achieving recovering of the phenol-contaminated soil. The method and the device can effectively remove phenol from the soil, basically have no electric field dead angle, simultaneously can cause no secondary pollution, and accordingly achieve effective recovering of the phenol-contaminated soil.

Description

technical field [0001] The invention relates to a method for repairing organic-contaminated soil, in particular to a method and a device for electrically repairing phenol-contaminated soil by using a three-dimensional porous carbon electrode. Background technique [0002] Soil is an important part of the ecological environment and one of the main resources for human survival. However, soil pollution in our country is very serious. According to reports, there are about 150 million mu of polluted cultivated land in our country. Therefore, soil remediation is an urgent technical problem to be solved in our country. [0003] Phenol is a class of highly toxic substances with carcinogenic, teratogenic, and mutagenic effects, and has been included in the list of priority pollutants in my country. At present, the remediation methods for phenol-contaminated soil mainly include physical remediation, chemical oxidation and biological remediation, but these methods often involve a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 刘守清裴晓哲沈光华
Owner SUZHOU UNIV OF SCI & TECH
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