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Method for repairing PAHs-polluted soil by enhancing electrodynamics through surface active agent

A surfactant and polluted soil technology, applied in the field of surfactant-enhanced electrodynamic remediation of PAHs polluted soil, can solve problems such as the inability to achieve PAHs conversion and degradation, and achieve enhanced solubility and migration efficiency, promotion of degradation, and improved catalytic activity. Effect

Inactive Publication Date: 2016-11-16
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding surfactants in the remediation process of PAHs-contaminated soil with EK can improve the migration efficiency of PAHs, but cannot achieve the conversion and degradation of PAHs.

Method used

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  • Method for repairing PAHs-polluted soil by enhancing electrodynamics through surface active agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for surfactant-enhanced electrokinetic repair of PAHs-contaminated soil, the method described in this embodiment is characterized in that it comprises:

[0027] 1) Preparation before remediation of PAHs-contaminated soil:

[0028] A shed is built above the PAHs-contaminated soil (11) to be repaired, and the PAHs-contaminated soil to be repaired is mechanically loosened. Spray the surfactant solution on the loosened soil surface, the spraying amount of the surfactant solution is 10-80L / m 2 ;

[0029] 2) Remediation system for PAHs contaminated soil:

[0030] Schematic diagram of PAHs-contaminated soil remediation system figure 1As shown, an anode chamber (13) and a cathode chamber (9) are symmetrically arranged on both sides of the PAHs-contaminated soil (11) to be repaired, and the PAHs-contaminated soil (11) to be repaired: the anode chamber (13): the cathode chamber ( 9) has a volume ratio of (10-100): 1:1; an anode interlayer (12) is provided between the...

Embodiment 2

[0038] A method for surfactant-enhanced electrokinetic remediation of PAHs-contaminated soil. The method described in this embodiment is characterized in that it includes:

[0039] 1) Preparation before remediation of PAHs-contaminated soil:

[0040] A shed is built above the PAHs-contaminated soil (11) to be repaired, and the PAHs-contaminated soil to be repaired is mechanically loosened. Spray the surfactant solution on the loosened soil surface, the spraying amount of the surfactant solution is 20-90L / m 2 ;

[0041] 2) Remediation system for PAHs contaminated soil:

[0042] Schematic diagram of PAHs-contaminated soil remediation system figure 1 As shown, an anode chamber (13) and a cathode chamber (9) are symmetrically arranged on both sides of the PAHs-contaminated soil (11) to be repaired, and the PAHs-contaminated soil (11) to be repaired: the anode chamber (13): the cathode chamber ( 9) has a volume ratio of (20-90): 1:1; an anode interlayer (12) is provided betwee...

Embodiment 3

[0050] A method for surfactant-enhanced electrokinetic remediation of PAHs-contaminated soil. The method described in this embodiment is characterized in that it includes:

[0051] 1) Preparation before remediation of PAHs-contaminated soil:

[0052] A shed is built above the PAHs-contaminated soil (11) to be repaired, and the PAHs-contaminated soil to be repaired is mechanically loosened. Spray the surfactant solution on the loosened soil surface, the spraying amount of the surfactant solution is 30-100L / m 2 ;

[0053] 2) Remediation system for PAHs contaminated soil:

[0054] Schematic diagram of PAHs-contaminated soil remediation system figure 1 As shown, an anode chamber (13) and a cathode chamber (9) are symmetrically arranged on both sides of the PAHs-contaminated soil (11) to be repaired, and the PAHs-contaminated soil (11) to be repaired: the anode chamber (13): the cathode chamber ( 9) with a volume ratio of (30-100): 1:1; an anode interlayer (12) is provided bet...

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Abstract

The invention relates to a method for repairing PAHs-polluted soil by enhancing the electrodynamics through a surface active agent. The method is characterized by comprising the steps that a work shed is built above the PAHs-polluted soil (11) to be repaired, and the PAHs-polluted soil (11) to be repaired is loosened mechanically; a surface active agent solution is sprayed to the surface of the loosened soil with the spraying amount being 10-100 L / m<2>; an anode chamber (13) and a cathode chamber (9) are symmetrically arranged on the two sides of the PAHs-polluted soil (11) to be repaired, an anode buffer solution flows circularly between the anode chamber (13) and an anode buffer pool (2), and a cathode buffer solution flows circularly between the cathode chamber (9) and a cathode buffer pool (5); the voltage gradient of a constant-voltage direct-current power source (3) is 0.1-1 V / cm; and on the 1st-3rd day of the circulation flowing process, 10-100 L of a laccase solution is sprayed to the surface of each square meter of the PAHs-polluted soil (11) to be repaired at a time. The method has the characteristics of being simple in repairing system, capable of achieving in-situ repairing, environmentally friendly and safe, and migration and degradation of pollutants in the PAHs-polluted soil can be achieved simultaneously.

Description

technical field [0001] The invention belongs to the technical field of remediation of polluted soil. It specifically relates to a surfactant-enhanced electrokinetic repair method for PAHs-contaminated soil. Background technique [0002] Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons, PAHs) usually refer to condensed ring compounds containing two or more rings arranged in a linear, angular or clustered form, which are hydrophobic organic pollutants, and PAHs are highly carcinogenic , mutagenic and teratogenic properties, it is the largest category of environmental carcinogenic chemicals, and has a strong inhibitory effect on the growth of microorganisms. Due to their stable ring structure, PAHs are not easily utilized by microorganisms and widely exist in the human ecological environment. Coking plants, iron and steel plants, and gas plants will emit a large amount of PAHs during the production process. Through atmospheric dry and wet deposition, etc., t...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/085B09C1/105B09C2101/00
Inventor 任大军郭舒悦张淑琴龚洁杨芬李春侠
Owner WUHAN UNIV OF SCI & TECH
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