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Electrodynamic method for removing fluorine contaminant in soil

An electrokinetic and pollutant technology, applied in the restoration of polluted soil, etc., can solve the problems of soil pH value change, endangering the security of soil ecosystem, etc., to reduce electrochemical polarization, avoid the reduction of desorption effect, reduce The effect of small concentration polarization

Inactive Publication Date: 2010-07-28
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, soil electrokinetic remediation technology mainly focuses on the removal of heavy metals and organic pollutants in soil. There are occasional reports on the use of electrokinetic technology to remove anionic pollutants in soil, especially fluoride, but they all use strong alkaline solution as electrolysis. After remediation, the pH value of the soil changed drastically, which endangered the safety of the soil ecosystem

Method used

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  • Electrodynamic method for removing fluorine contaminant in soil
  • Electrodynamic method for removing fluorine contaminant in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 adopts such as figure 1 The electrokinetic device shown performs the removal process of fluorine pollutants in soil. The positive pole of the regulated DC power supply 1 is connected to the anode 5 through a wire, and the negative pole is connected to the cathode 6 . The electrolytic cell 2 is placed horizontally, and the anode chamber 3 and the cathode chamber 4 are respectively arranged at two ends of the electrolytic cell 2 . The anode 5 is placed in the anode chamber 3, the cathode 6 is placed in the cathode chamber 4, the anion exchange membrane 7 is placed between the anode and the polluted soil, and the alkali-resistant filter membrane 8 is placed between the polluted soil and the cathode. The anolyte circulates in the loop formed by the anode chamber 3, the transfer pump 15 and the conduit, so that the anolyte is mixed evenly; the anolyte storage chamber 9, the flow regulating valve 13, the anode chamber 3, and the transfer pump 17 form a loop thro...

Embodiment 2

[0019] The structure of the electrokinetic device used is the same as in Example 1.

[0020] Weigh 2000.0g of contaminated soil with a pH value of 7.6 and a fluorine content of 1382mg / kg, adjust the soil moisture content to 40%, and place it in an electrolytic cell. The anode electrolyte uses deionized water, and no sodium acetate solution is added during the restoration process. Its pH value, the initial electrolyte in the cathode chamber also uses deionized water, and does not add acetic acid to control its pH value during the repair process; the circulation flow rate of the electrolyte in the bipolar chamber is 3500ml / h, and the electric field strength is 1V / cm. After 240h of treatment, the fluoride ion The residual fluorine content in the soil was determined by selective electrode method to be 635mg / kg, the removal rate was 54%, the soil pH value at the anode end was 8.4, and the soil pH value at the cathode end was 12.1.

Embodiment 3

[0022] The structure of the electrokinetic device used is the same as in Example 1.

[0023]Replace the anion-exchange membrane 7 with an acid-resistant filter membrane, weigh 2000.0 g of polluted soil with a pH value of 7.6 and a fluorine content of 1382 mg / kg, adjust the soil moisture content to 40%, place it in an electrolytic cell, and use anolyte to remove Ionized water, sodium acetate solution is not added to adjust its pH value during the restoration process, deionized water is also used for the initial electrolyte in the cathode chamber, and acetic acid is not added to control its pH value during the repair process; the circulation flow rate of the electrolyte in the bipolar chamber is 3500ml / h, and the electric field The strength is 1V / cm, after 240h of treatment, the fluorine content of the soil measured by the fluoride ion selective electrode method is 1256mg / kg, the removal rate is 9.1%, the pH value of the soil at the anode end is 2.4, and the pH value of the soil ...

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Abstract

The invention discloses an electrodynamic method for removing fluorine contaminant in soil, which is as follows: an anion-exchange membrane is arranged between the anode and the contaminated soil to prevent the H+ generated by the anode from entering the electrolyzer so as to avoid the increase of the acidity of the contaminated soil; sodium acetate solution is put in an anode chamber to be used as electrolyte, deionized water is put in a cathode chamber to be used as electrolyte, and the liquid levels of the anode chamber and the cathode chamber are maintained to be parallel; in the rehabilitating process, the electrolytes circulate constantly to be stirred evenly so as to bring away the H2 and O2 which are generated by the anode and the cathode; the sodium acetate solution added in the anode chamber supplies OH- which neutralizes the H+ generated by the anode, and the surplus OH- and the OH- generated by the cathode promote the adsorbed fluorine in the soil to be desorbed to be free fluorinions; and the fluoride in the soil is removed through the electrodynamic approaches of electromigration, electroosmosis and the like. The method can effectively promote the adsorbed fluoride to be desorbed from the surface of the contaminated soil particles, remarkably improves the fluorine contaminant removal efficiency, reduces overpotential and saves energy consumption, and after the soil is rehabilitated, the pH value of the soil is basically maintained at the original state.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and energy saving, and relates to an electrokinetic method for removing fluorine pollutants in soil, in particular to a method for enhancing electrokinetic repair of fluorine-contaminated soil by using an anion exchange membrane and strong alkali and weak salt solution. Background technique [0002] Fluorine is an essential trace element for human body and animals. Insufficient intake is prone to dental caries and bone fragility. However, excessive fluorine will not only cause fluorosis symptoms such as dental fluorosis and skeletal fluorosis, but also affect children's intellectual development and male reproductive health. There are adverse effects. After plants are poisoned by fluorine, various diseases such as leaf tip necrosis, gradual chlorosis of leaves, and decline in yield and quality of plants will also occur. [0003] Excessive fluorine in the soil will have potential h...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 朱书法周鸣刘亚纳魏学锋苗娟
Owner HENAN UNIV OF SCI & TECH
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