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Electrodynamic and drop-irrigation combined heavy-metal-polluted soil remediation method

A technology of polluted soil and electrokinetics, applied in the field of environmental pollution control, can solve the problems of uncontaminated soil remediation, and achieve the effects of preventing soil acidification, reducing concentration, promoting desorption and migration

Inactive Publication Date: 2012-06-20
大恩(天津)环境检测有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, drip irrigation technology has achieved very significant results in the maintenance and water saving of roads and bridges, but there is no report on its application in the remediation of contaminated soil

Method used

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  • Electrodynamic and drop-irrigation combined heavy-metal-polluted soil remediation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Such as figure 1 As shown, the electrolytic cell is an open plexiglass container and is placed horizontally. 1 and 2 are carbon fiber anodes and cathodes respectively. Tourmaline powder is placed between the two sides of the polluted soil 4 and the electrodes, and a drip irrigation device 5 is set on the soil near the tourmaline powder. , the anode 1 and the cathode 2 are respectively connected to both ends of the DC power supply 6 .

[0015] The length, width and height of the electrolytic cell are 30cm×10cm×11cm, and the electrolytic cell is made of Cd(NO 3 ) 2 , Pb(NO 3 ) 2 It is prepared into polluted soil, the thickness of tourmaline on both sides is 0.6cm, and the particle size of tourmaline is d 90 =5.23μm, the voltage gradient is 1.0V / cm, continuous drip irrigation of 0.1mol / L KCl solution, the total amount of drip irrigation is 1800ml, the electrode distance is 20cm, the cathode and anode switching cycle is 3h, and the system runs continuously for 12 days. ...

Embodiment 2

[0019] Such as figure 1 As shown, the electrolytic cell is an open plexiglass container and is placed horizontally. 1 and 2 are made of carbon fiber to make an anode and a cathode respectively. Zeolite powder is placed between the two sides of the polluted soil 4 and the electrodes, and a drip irrigation device 5 is set on the soil near the zeolite powder. , the anode 1 and the cathode 2 are respectively connected to both ends of the DC power supply 6 .

[0020] The length, width and height of the electrolytic cell are 30cm×10cm×11cm, and the electrolytic cell is made of Cd(NO 3 ) 2 , Pb(NO 3 ) 2 It is formulated into polluted soil, the thickness of zeolite on both sides is 0.6cm, and the particle size of zeolite is d 90 =1.68μm, the voltage gradient is 1.0V / cm, continuous drip irrigation of citric acid solution, the total amount of drip irrigation is 1900ml, the electrode distance is 20cm, the switching cycle of cathode and anode is 12h, and the system runs continuously f...

Embodiment 3

[0024] Such as figure 1 As shown, the electrolytic cell is an open plexiglass container and is placed horizontally. 1 and 2 are made of carbon fiber to make an anode and a cathode respectively. Diatomite powder 3 is placed between the two sides of the polluted soil 4 and the electrodes. On the soil near the diatomite A drip irrigation device 5 is provided, and the anode 1 and the cathode 2 are respectively connected to two ends of a DC power supply 6 .

[0025] The length, width and height of the electrolytic cell are 30cm×10cm×11cm, and the electrolytic cell is made of Cd(NO 3 ) 2 , Pb(NO 3 ) 2 Prepare polluted soil, diatomaceous earth thickness on both sides is 0.6cm, voltage gradient is 1.0V / cm, continuous drip irrigation of EDTA solution, total drip irrigation is 2100ml, electrode distance is 20cm, cathode and anode switching cycle is 48h, and the system runs continuously for 12 days . The contents of heavy metals in contaminated soil before and after remediation are ...

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Abstract

The invention discloses an electrodynamic and drop-irrigation combined heavy-metal-polluted soil remediation method. The method comprises the following steps of: mounting positive and negative electrodes at the two ends of heavy-metal-polluted soil, wherein the positive and negative electrodes are made from carbon fibers; respectively placing adsorbents between the positive electrode and the polluted soil and between the negative electrode and the polluted soil; placing a drop irrigation device above soil close to the absorbents; slowly dropwise adding electrolyte, buffer solution or a complexing agent and the like into the polluted soil at the two sides, and carrying out periodic polarity switching, wherein heavy metal moves under the action of electric migration and is adsorbed by the adsorbents, thus concentration of the heavy metal in the soil is reduced. According to the invention, drop irrigation technology is applied to polluted soil electric remediation, a complex anode chamber, a complex cathode chamber and an electrolyte circulating system in the traditional electrodynamic remediation are not used, a proper amount of drop irrigation liquid is reserved in the soil, electrolyte and secondary pollution are effectively avoided, and the method disclosed by the invention has the advantages of simple structure, operation convenience, practicability, effectiveness and the like.

Description

technical field [0001] The invention relates to an environmental pollution treatment method, in particular to a treatment method for heavy metal polluted soil. Background technique [0002] Electrokinetics is a green restoration technology for soil and groundwater restoration. It can be used to remove some organic pollutants and heavy metal ions. It has environmental compatibility, multi-functional applicability, high selectivity, and is suitable for automatic control. Features such as low operating costs. In the electrokinetic restoration process, metals and charged ions undergo directional migration under the action of an electric field, and then undergo concentrated treatment in a set treatment area. Traditional electrokinetic restoration processes typically require two fluid circulation systems: one for the cathode and one for the anode. The pH of the cathode or anode is controlled by controlling the flow of acid or base from the storage tank into the circulating liqui...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 刘汉桥张曙光王建伟杨学东
Owner 大恩(天津)环境检测有限公司
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