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Method for restoring heavy metal contaminated soil by utilizing combination of microorganisms and EK-PRBs

A technology for polluted soil and heavy metals, applied in the restoration of polluted soil and other directions, can solve problems such as poor remediation efficiency of electrokinetic methods, and achieve the effects of low remediation treatment cost, simple operation and high remediation efficiency.

Inactive Publication Date: 2017-08-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the comprehensive effect of various influencing factors, the restoration efficiency of the traditional electrokinetic method is poor. Therefore, how to improve the restoration efficiency of the electrokinetic method is currently a research hotspot in soil electrokinetic restoration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for repairing heavy metal-contaminated soil using microorganisms combined with EK-PRB, using an electric (EK) repair device to repair heavy metal-contaminated soil, and the electric repair device consists of a reaction tank, two electrodes, and two permeable reaction walls. (Permeable Reactive Barrier, PRB) and a DC power supply. There are detachable permeable reaction walls in front of the two electrodes. Between the two permeable reaction walls are used to place heavy metal compound polluted soil, humus and make the reaction tank The mixture is subjected to a voltage gradient of 1 V / cm, and after 4-8 days of electrification; the permeable reaction wall is removed, and heavy metal ions are removed from the soil. The specific steps are as follows:

[0026] (1). Weigh a certain amount of surface soil from the experimental field in the east area of ​​Baoshan Campus, Shanghai University, with a layer thickness of 0-20cm. After natural air drying, put it into a mort...

Embodiment 2

[0031] Embodiment 2 This embodiment utilizes natural polluted soil to carry out experiment:

[0032]This embodiment 2 is basically the same as embodiment 1, and the special features are:

[0033] The soil described in step (1) in Example 2 was selected from the polluted surface soil of a certain industrial legacy site in Shanghai, and the heavy metal-polluted soil was obtained after remediation.

[0034] The soil after above-mentioned remediation was tested with a chemical analyzer, and the hexavalent chromium concentration in the soil was measured to be 29.6 mg / kg, and the removal rate was 94.6%; the total chromium concentration was 217.9 mg / kg, and the removal rate was 65.3%; the cadmium concentration The removal rate was 8.9 mg / kg, and the removal rate was 68.7%, achieving a good heavy metal removal effect.

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Abstract

The invention discloses a method for restoring heavy metal contaminated soil by utilizing combination of microorganisms and EK-PRBs. According to the method, the heavy metal contaminated soil is repaired by using an electrokinetic (EK) repairing device, the electrokinetic repairing device is composed of a reactive tank, two electrodes, two permeable reactive barriers (PRB) and a direct-current power supply, the detachable permeable reactive barriers are arranged in front of the two electrodes respectively, the heavy metal composite contaminated soil, humus and a microbial reactive tank are arranged between the permeable reaction barriers, voltage is applied to the two electrodes, after electrification, cadmium in the soil is transferred to the cathode under the effect of the electric force and is adsorbed and fixed by the permeable reactive barrier before the cathode, chromium in the soil is transferred to the anode under the effect of the electric force and is adsorbed and fixed by the permeable reactive barrier before the anode, and the permeable reactive barriers for adsorbing and fixing heavy metal ions are removed so as to obtain the soil with pollution of the heavy metal ions removed. The method is simple to operate, low in cost and convenient to use, on-site repairing of the heavy metal contaminated soil can be realized, the repairing efficiency is high, and no new pollution is generated in the repairing process.

Description

technical field [0001] The invention relates to a method for repairing heavy metal-contaminated soil by using microorganisms combined with Electrokinetic (EK)-permeable reactive barrier (Permeable Reactive Barrier, PRB), which belongs to the technical field of environmental protection. [0002] technical background [0003] In the process of urbanization and the improvement of urban living environment in my country, the industrially polluted soil left in urban areas due to the upgrading of industrial structure, adjustment of urban layout, and the relocation of enterprises such as polluting and disturbing residents has seriously threatened the surrounding environment and the health of residents. Especially in the industrial soil left over from heavily polluted industries in developed areas, the common compound heavy metal pollutants in the soil, such as cadmium, chromium, nickel, lead and other elements, will endanger the stability of the ecosystem, especially pose a serious th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/085B09C1/10B09C2101/00
Inventor 何池全何佳颖童友节奚文杰王丙磊王昶童叶妍
Owner SHANGHAI UNIV
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