Formula and application of working solution for electrokinetic remediation of antimony contaminated soil

A technology of polluted soil and electric restoration, which is applied in the field of soil restoration to achieve the effects of improving ion exchange capacity, improving the removal rate of antimony, and increasing work efficiency

Active Publication Date: 2019-02-05
南京迪天高新产业技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are no reports and successful cases on the use of electrod

Method used

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  • Formula and application of working solution for electrokinetic remediation of antimony contaminated soil
  • Formula and application of working solution for electrokinetic remediation of antimony contaminated soil
  • Formula and application of working solution for electrokinetic remediation of antimony contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Prepare a 1:1 0.05mol / L potassium dihydrogen phosphate-potassium hydroxide solution and a 1:1 0.2mol / L buffer solution. In the electric repair reaction device, the iron plate is used as the anode, and the steel plate is used as the cathode, and a DC power supply is used for regular intermittent power supply, and the current density is 1mA / cm 2 , the ratio of plate area to reactor side area is 1 / 2 m 2 / m 2 , The plate spacing is 15cm. Add 0.05 mol / L potassium dihydrogen phosphate-potassium hydroxide solution to the anode tank, and add 0.1 mol / L buffer solution to the cathode tank. The addition method is one-time addition, and samples are taken every 2 hours. Turn on the DC power supply, turn on the power for 2 hours, then cut off the power for 2 hours, and stop the power supply after 72 hours. It is measured that the removal rate of antimony in the soil reaches 30%.

Embodiment 2

[0048] Prepare a 1:1 0.5mol / L potassium dihydrogen phosphate-potassium hydroxide solution and a 1:1 0.8mol / L buffer solution. In the electric repair reaction device, the iron plate is used as the anode, and the steel plate is used as the cathode, and a DC power supply is used for regular intermittent power supply, and the current density is 1mA / cm 2 , the ratio of plate area to reactor side area is 1 / 2 m 2 / m 2 , The plate spacing is 15cm. Add 0.5 mol / L potassium dihydrogen phosphate-potassium hydroxide solution to the anode tank, and add 0.8 mol / L buffer solution to the cathode tank. The addition method is one-time addition, and samples are taken every 2 hours. Connect the DC power supply, turn on the power for 2 hours, then cut off the power for 2 hours, and stop the power supply after 72 hours. The removal rate of antimony in the soil is measured to reach 41%.

Embodiment 3

[0050] Prepare a 1:1 0.5mol / L potassium dihydrogen phosphate-potassium hydroxide solution and a 1:1 0.8mol / L buffer solution. In the electric repair reaction device, the iron plate is used as the anode, and the steel plate is used as the cathode, and a DC power supply is used for regular intermittent power supply, and the current density is 15mA / cm 2 , the ratio of plate area to reactor side area is 1 / 2 m 2 / m 2 , The plate spacing is 25cm. Add 0.5 mol / L potassium dihydrogen phosphate-potassium hydroxide solution to the anode tank, and add 0.8 mol / L buffer solution to the cathode tank. The addition method is one-time addition, and samples are taken every 2 hours. Connect the DC power supply, turn on the power for 4 hours, then cut off the power for 4 hours, and stop the power supply after 72 hours. The removal rate of antimony in the soil is measured to reach 50.9%.

[0051] The following table is the concentration of antimony in the soil after restoration using Examples 1-...

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Abstract

The invention discloses a formula and application of a working solution for electrokinetic remediation of antimony contaminated soil. In an electrokinetic remediation reactor, under the synergistic effect of ferrous ions or phosphate anions at the cathode, antimony replaced through the phosphate anions or original free state antimony or pentavalent antimony entering the anode working solution in an electromigration mode is reduced into trivalent antimony, and ferrous ions produced after anode potential electrochemical dissolution are purified or removed under a coprecipitation or flocculationeffect. By adopting the technical scheme, the formula and application of the working solution have the beneficial effects that the working solution formula is simple in raw material, good in treatingeffect, high in remediation speed and easy and convenient in operation, the formula is applied to electrokinetic remediation of the antimony contaminated soil, the remediation efficiency of the antimony contaminated soil is improved by 50%-100%, and the remediation speed is increased.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a formula and application of a working fluid for electrically remediating antimony-contaminated soil. Background technique [0002] Antimony is not a naturally abundant element, and the content in the bottom shell is about 0.2mg / kg. However, due to the increase in the concentration of antimony in the environment due to human activities, the global flux of antimony has increased by at least 10 times in the past ten years. The antimony content in the hair of the residents in the polluted area collected in the study was 15.9 mg / kg, so it is necessary to develop and effectively implement cleaning technology in the mining area to remove antimony in the soil. [0003] Currently available technologies for dealing with antimony-contaminated soil are mainly phytoremediation, microbial remediation and leaching. The operating cost of phytoremediation is low, and it is relatively e...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/085
Inventor 汪一潭秦丰林郑伟张慧任欢鱼刘新荣
Owner 南京迪天高新产业技术研究院有限公司
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