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Electrokinetic remediation method of heavy metal polluted soil by composite electrodes

A composite electrode and heavy metal technology, applied in the restoration of contaminated soil, etc., can solve the problems that cannot meet the needs of heavy metal-contaminated soil remediation projects, and the pH value control method is complicated and difficult to achieve.

Active Publication Date: 2013-10-23
上海环境保护有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Although the above-mentioned prior art has disclosed the use of Fe in the remediation of heavy metal-contaminated soil and the method of controlling the pH value of the cathode, because soil pollutants are often combined with soil particles or organic matter, the sufficient interaction between pollutants and Fe is limited. contact, resulting in many restrictions on the use of Fe in soil remediation. At the same time, the existing pH value control methods are too complicated to be implemented in actual remediation projects.
In the future, with the higher requirements for the practicability of heavy metal-contaminated soil remediation technology, these existing technologies can no longer meet the needs of actual remediation projects for heavy metal-contaminated soil.

Method used

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  • Electrokinetic remediation method of heavy metal polluted soil by composite electrodes
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  • Electrokinetic remediation method of heavy metal polluted soil by composite electrodes

Examples

Experimental program
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Effect test

preparation example Construction

[0056] The preparation of the permeable reaction composite electrode of the present invention and the method for using it to carry out electrokinetic restoration of heavy metal polluted soil comprise the following steps:

[0057] (1) Fabrication of composite electrodes

[0058] Fe 0: The particle size is 10 mesh, 50 mesh, 100 mesh, 200 mesh, 400 mesh, 600 mesh or 1000 mesh powder.

[0059] Basic zeolite: basic zeolite with particle diameters of 10 mesh, 50 mesh, 100 mesh, 200 mesh, 400 mesh, 600 mesh or 1000 mesh, the basic zeolite is NaX, NaY, NaM, NaA or NaZSM-5, or is to place KF in Al 2 o 3 ·Basic zeolite formed by loading and modifying on 2NaY composite material. These zeolites have a pH of 8-14, preferably 14.

[0060] Acidic zeolite: Acidic zeolite with a particle size of 10 mesh, 50 mesh, 100 mesh, 200 mesh, 400 mesh, 600 mesh or 1000 mesh, the acidic zeolite is any acidic natural zeolite, or natural zeolite and the above-mentioned basic zeolite Acidic zeolite fo...

Embodiment 1

[0073] Embodiment 1: the remediation of chromium (VI) polluted soil

[0074] Using a plate-shaped composite electrode, electrokinetic remediation of chromium-contaminated soil with a chromium (VI) content of 120.1 mg / kg and a moisture content of 30% by mass is carried out. Composite electrodes were composed of graphite electrode plates and different permeable reaction materials, and four groups of experiments (A, B, C, and D) were carried out (as shown in Table 1 below). The cathode and anode are respectively high-purity graphite electrodes, and the basic zeolite in the active material is selected from NaX zeolite (initial pH value is 12), and the acid zeolite is formed by acidifying clinoptilolite with 10% phosphoric acid [mass concentration, the same below]. The particle size of the two zeolites is 30 mesh, and the selected Fe 0 The particle size is 300 mesh, these two zeolites and Fe 0 The mass ratio is 1:1. The distance between the cathode and anode electrodes is 20cm, ...

Embodiment 2

[0080] Embodiment 2: the remediation of chromium (VI) polluted soil

[0081] The same chromium (VI) contaminated soil was repaired in the same way as in Experiment D in the above-mentioned Example 1, the difference being that the composite electrode used contained active carbon acidified with 10% acetic acid with a concentration of 10% by mass. The results show that compared with the experiment D in Example 1, when activated carbon is included, the ability to regulate the pH value of the soil is stronger, and the fluctuation of the pH value is reduced by 1 to 2 units, and the removal rate of chromium (VI) is further improved at the same time , the amount of residual chromium in the soil is reduced to 1.2% from 1.9% in Example 1. It can be seen that when the adsorption material is contained, the composite electrode of the present invention exhibits more excellent performance.

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Abstract

The invention relates to composite electrodes and an electrokinetic remediation method of heavy metal polluted soil by using the composite electrodes. According to the electrodes, an active material layer is adhered to the surface of graphite electrodes or metal electrodes of an anode and a cathode so as to form integrated composite electrodes with permeable reactive performance. By the permeable reactive layer, on one hand, H<+> and OH<-> generated from the electrode reaction can be neutralized and adsorbed, the pH value of the soil can be effectively controlled, and the heavy metal can be prevented from being prematurely deposited in the soil. On the other hand, migrated heavy metal pollutants can be captured, and in situ removal of the heavy metal pollutants in the soil can be realized by removing the composite electrodes.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to the technical field of repairing heavy metal polluted soil by using an electric method. Background technique [0002] Soil heavy metal pollution has always been one of the most important environmental problems worldwide. The cultivated land polluted by heavy metals in my country has reached 20 million hectares, of which more than 700,000 hectares are seriously polluted. Soil heavy metal pollution not only affects the quality and use value of soil, but also pollutes surface water and groundwater, which is harmful to human health and ecological security. Especially in recent years, the long-term accumulation of heavy metal pollution problems in my country has begun to appear, heavy metal pollution incidents have occurred frequently, and the demand for the development and application of heavy metal pollution prevention and control technologies has becom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 付融冰徐珍
Owner 上海环境保护有限公司
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