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Method for remediation of heavy-metal contaminated soil based on principle of galvanic cell

A technology of polluted soil and primary battery, applied in the field of soil remediation, can solve the problems of difficult removal of heavy metal cations, high power consumption, and reduced removal rate of heavy metals, and achieve low cost, easy operation, and environmental friendliness

Active Publication Date: 2019-04-16
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, electrokinetic repair consumes a lot of power, usually requiring tens of volts; on the other hand, electrokinetic repair has water decomposition, which leads to an increase in pH near the cathode, and heavy metal ions precipitate in the area near the cathode, thereby reducing the heavy metal removal rate (Chem .Eng.J., 2009, 169, 703-710; Environ.Pollut., 2009, 157, 3379-3386; Chem.Eng.J., 2017, 316, 601-608)
[0004] It has been reported in the literature that based on the principle of primary batteries, using air as the positive electrode and zero-valent iron as the negative electrode can remove arsenic in water. However, the positive electrode usually requires an expensive platinum electrode as a catalyst to allow the discharge reaction to proceed quickly, and this system is difficult. Realize the removal of heavy metal cations (J.Hazard.Mater.,2013,261,621-627)

Method used

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  • Method for remediation of heavy-metal contaminated soil based on principle of galvanic cell
  • Method for remediation of heavy-metal contaminated soil based on principle of galvanic cell
  • Method for remediation of heavy-metal contaminated soil based on principle of galvanic cell

Examples

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Embodiment 1

[0028] A method for removing heavy metals in soil based on the principle of primary batteries, the steps are as follows:

[0029] 1) Add 0.3 times the weight of 0.1mol L to the polluted soil -1 Disodium edetate solution;

[0030] 2) With the stainless steel net as the current collector of the electrode, the iron-manganese nodule powder and iron powder that have passed the 100-mesh sieve are respectively placed in the stainless steel net as the positive electrode and the negative electrode of the original battery, and the quality of the iron-manganese nodule powder and the iron powder is respectively 0.01 times and 0.005 times that of the negative electrode, the stainless steel mesh used as the negative electrode is wrapped with a layer of mixed cellulose microporous filter membrane to prevent the oxides produced by the corrosion of the negative electrode from entering the soil and changing the structure and properties of the soil, and then put the positive and negative electro...

Embodiment 2

[0038] A method for removing heavy metals in soil based on the principle of primary batteries, comprising the following steps:

[0039] 1) Add 0.2 times the weight of 0.5mol L to the polluted soil -1 Sodium citrate solution;

[0040]2) Using stainless steel mesh as the current collector of the electrode, put the manganese sand powder passing through the 100 mesh sieve and the iron powder passing through the 60 mesh sieve into the stainless steel mesh respectively as the positive and negative electrodes of the primary battery, the quality of the manganese sand powder and the iron powder They are 0.03 times and 0.01 times of the soil respectively. The stainless steel mesh used as the negative electrode is wrapped with a layer of mixed cellulose microporous filter membrane to prevent the oxides produced by the corrosion of the negative electrode from entering the soil and changing the soil structure and properties, and then put the positive and negative electrodes into the soil r...

Embodiment 3

[0043] A method for removing heavy metals in soil based on the principle of primary batteries, comprising the following steps:

[0044] 1) Add 0.5 times the weight of 1mol L to the polluted soil -1 Sodium humate solution;

[0045] 2) Using stainless steel mesh as the current collector of the electrode, the birnessite powder and iron powder that have passed through a 60-mesh sieve are respectively placed in the stainless steel mesh as the positive and negative electrodes of the primary battery. The quality of the birnessite powder and the iron powder are both soil 0.005 times that of the negative electrode, the stainless steel mesh used as the negative electrode is wrapped with a layer of mixed cellulose microporous filter membrane to prevent the oxides produced by the corrosion of the negative electrode from entering the soil and changing the structure and properties of the soil. Connect the positive and negative electrodes, and use a constant current discharge controller to ...

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Abstract

The invention discloses a method for remediation of heavy-metal contaminated soil based on a principle of a galvanic cell. The method comprises the following steps that 1) organic acid or a saline solution or an inorganic alkaline solution is added in the contaminated soil; 2) positive and negative electrodes are placed into the two sides of the soil respectively to form the galvanic cell for discharging, so that heavy metal ions in the soil migrate towards the electrodes and are captured, thereby achieving the remediation of the heavy-metal contaminated soil. The method for the remediation ofthe heavy-metal contaminated soil based on the principle of the galvanic cell has the advantages that Cu<2+>, Cd<2+>, Pb<2+>, Zn<2+>, As (III,V), Cr(III VI) and other obvious heavy metals in the soilcan be efficiently removed, the removal efficiency is high, the cost is low, the operation is simple and convenient, and the environment is friendly.

Description

technical field [0001] The invention belongs to the field of soil remediation, and in particular relates to a method for remediating heavy metal polluted soil by utilizing the principle of a primary battery. Background technique [0002] Soil heavy metal pollution has become a global problem that needs to be solved urgently. Heavy metals seriously threaten the ecosystem and human health due to their high toxicity, refractory and concealment. At present, traditional methods still dominate soil pollution control, among which earthwork excavation and disposal account for about 30%, followed by in-situ chemical remediation. These methods are usually costly, cause secondary damage to soil and are not completely removed. As an emerging soil remediation technology, electrochemical remediation has the characteristics of not damaging the ecological environment, simple operation and low cost. [0003] The existing electrokinetic repair technology is to insert the electrode into the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/085
Inventor 邱国红乔琪刘立虎杨雄
Owner HUAZHONG AGRI UNIV