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Soil restoration method based on bioleaching and electrodynamics

A bioleaching and electrodynamic technology, applied in the restoration of polluted soil, etc., can solve problems such as long working cycle

Inactive Publication Date: 2015-06-03
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bioleaching technology has many advantages: such as mild reaction conditions, low energy consumption, simple steps and low environmental impact, but the long working cycle is still a limiting factor for large-scale practical application of bioleaching

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add tap water to the left and right chambers of the bioleaching-electrokinetic device as the electrolyte for the anode chamber and cathode chamber, and turn on the power to ensure that the current density provided by the DC power supply is 0.25-1.5 mA / cm 2 . Mix 40 g of soil samples with 1000 ml of deionized water and add 10 g L -1 FeSO 4 .7H 2 O and 10% v / v of the bioleaching inoculum, all of which were added to the middle chamber. Start the stirring device, adjust the stirring rate to 150-200 rpm, and use the aeration tube to pump air in to ensure that the effective supply of soluble oxygen is 7.0-8.0 mg / L and maintain the uniformity of the soil suspension. Samples were taken daily for 6 consecutive days. Measure its pH value and the dissolution rate of Cu, Zn, Cr, Pb over time.

[0031] The results show that: pH value is the most important operational parameter affecting the dissolution of heavy metals. Using the joint restoration method, the pH value drops shar...

Embodiment 2

[0033] Add tap water to the left and right chambers of the bioleaching-electrokinetic device as the electrolyte for the anode chamber and cathode chamber, and turn on the power to ensure that the current density provided by the DC power supply is 0.25-1.5 mA / cm 2 . Mix 80 g of soil samples with 1000 ml of deionized water, and add 5 g L -1 Sulfur powder and 5% v / v bioleaching inoculum, all added to the middle chamber. Start the stirring device, adjust the stirring rate to 150-200 rpm, and use the aeration tube to pump air in to ensure that the effective supply of soluble oxygen is 7.0-8.0 mg / L and maintain the uniformity of the soil suspension. Samples were taken daily for 6 consecutive days. Measure its pH value and the dissolution rate of Cu, Zn, Cr, Pb over time.

[0034] The results showed that the pH value is the most important operational parameter affecting the dissolution of heavy metals. Using the joint remediation method, the pH value dropped sharply over time, and...

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PUM

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Abstract

The invention discloses a soil restoration method based on bioleaching and electrodynamics. The method comprises the following steps: adding to-be-restored soil to a middle chamber of a bioleaching-electrodynamics device and adjusting the solid content; adding a reductive energy substrate and a bioleaching inoculum; adding electrolyte to left and right chambers, and switching on a power supply; and mixing a mixture of the middle chamber evenly, keeping certain dissolved oxygen, and carrying out restoring treatment on the soil. Heavy metals such as Cu, Zn, Cr and Pb in the polluted soil are removed by combining a bioleaching technique with an electrodynamics method; an acid environment is provided for electrodynamics restoration by the bioleaching technique; dissolution of heavy metals is accelerated; the soil restoration efficiency can be improved by collaboration of two techniques; and the restoration cycle is greatly shortened.

Description

Technical field [0001] The present invention involves a method of repairing heavy metal pollution soil based on bioline filtration and electric power. Background technique [0002] Human beings have developed industrial and agricultural, which has caused serious environmental problems, including soil pollution caused by toxic metals such as CU, Zn, CD, CR, PB, etc.Different from organic matter, heavy metals are not degraded by biology in the soil. Therefore, heavy metals will stay in the environment for a long time, accumulate in the soil first, and then enter groundwater and food chains, threatening to move and plant and human life.Therefore, the repair of heavy metal pollution soil is imminent. [0003] Looking at the reimbursement technology of soil heavy metal pollution in recent years, physics, chemistry and biological repair methods are generally adopted. [0004] Physical repair is one of the first development techniques, including engineering repair method, thermal analys...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/02B09C1/10
Inventor 余震王跃强黄雷
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI