Method for removing arsenic in soil by combining microorganisms with electric repairing

A technology of electrodynamic repair and microbiology, applied in the restoration of contaminated soil, etc., can solve the problem of low arsenic removal rate, achieve the effect of simple operation, low dissolving efficiency and easy acquisition

Active Publication Date: 2015-07-01
有研资源环境技术研究院(北京)有限公司
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  • Summary
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AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problem of low removal rate of arsenic in low-permeable compact soil at present, and aims to improve...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Bioelectric restoration of soil simulated in laboratory to remove arsenic

[0027] (1) The microorganism used is Acidophilus Thiobacillus ferrooxidans, which was purchased from the American Standard Biological Collection, with the preservation number ATCC23270.

[0028] (2) Acidophilus ferrooxidans was inoculated in conventional 9K medium (pH = 1.7) and pre-cultured to obtain a bacterial concentration of 10 8 ~10 9 Individual / mL microbial solution of acidophilic Thiobacillus ferrooxidans;

[0029] (3) Take 10% (about 10 6 ~10 7 cells / ml) were inoculated into the medium containing 9K liquid medium, and continued to culture at 30°C;

[0030] (4) Acidophilus ferrooxidans cultured in step (3) (about 10 8 ~10 9 pcs / ml) stored at 25 degrees for later use;

[0031] (5) Soil samples are contaminated soil samples from western Guangxi. Take 20 to 40 soils 30 to 80 cm away from the soil surface, mix them evenly, mash them, pass through 10 to 20 mesh sieves, and st...

Embodiment 2

[0038] Example 2 Removal of Arsenic by Bioelectric Restoration of Land Soil

[0039] (1) Carry out strain culture as in Example 1, make acidophilus Thiobacillus ferrooxidans (about 10 8 ~10 9 pcs / ml) for future use.

[0040] (2) Electrokinetic remediation was performed on the soil in northwestern Guangxi. The arsenic content in the soil was 187.1 mg / kg, the S content was 10.2 mg / kg, the Fe content was 21.6 mg / kg, and the permeability was 450 mm / h. Lay an anti-seepage layer at a depth of 40cm from the soil surface in the electric repair area, and set a 0.04m wide, 0.3m deep, and 1m long groove at a distance of 0.3m from the soil surface as an electrode operation, and insert Yin and Yang into two adjacent grooves. Grade electrode, the electrode is made of graphite electrode, and 0.05M HNO is added to the anode tank 3 The solution makes the pH in the anode tank 1.5, and add 0.2M HNO in the cathode tank 3 The solution makes the pH in the cathode tank 1.2, and the current density...

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Abstract

The invention provides a method for removing arsenic in soil by combining microorganisms with electric repairing. The method comprises the following steps: in a process for pollution governance on arsenic in soil by adopting an electric repairing method, introducing the microorganisms (acidithiobacillus ferrooxidans) into soil which is being repaired; and adding a mixed liquid of HNO3 and microorganisms at an anode, and adding HNO3 at a cathode, so that, due to the action of microorganisms and arsenic and synergistic action of electrostatic force in the electric repairing process, the arsenic which is difficult to remove independently by an electric repairing method in soil is effectively removed. The method has the advantages that by virtue of the action of the microorganisms and the arsenic in soil, the arsenic is changed into an ionic state, and is removed from the soil by the electric repairing method, coordination of two effects is realized; the target of effectively removing arsenic pollution in the soil is reached; the method is simple to operate and low in price; and new pollution is not generated in the implementation process.

Description

technical field [0001] The invention belongs to the technical field of soil electrodynamic restoration, and in particular relates to a new method for removing arsenic in soil by combining microorganisms and electrodynamic restoration. Background technique [0002] Soil is an important natural resource in human production and life, and human beings cannot do without soil for basic necessities of life. With the rapid development of metallurgy, chemical industry, mining industry, electronics industry and foundry industry, the problem of soil heavy metal pollution is becoming more and more serious. Soil heavy metal pollution has deteriorated the quality of human living environment, leading to frequent occurrence of various pollution incidents, seriously endangering the virtuous cycle of the ecosystem and the survival and health of human beings. Soil heavy metal restoration has become a hot spot in today's society. Arsenic, as the most representative toxic substance and difficul...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 徐政黄松涛杨丽梅纪仲光李岩王巍
Owner 有研资源环境技术研究院(北京)有限公司
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