Method and system for repairing polycyclic aromatic hydrocarbon contaminated soil through fenton-like and microorganism combination

A technology for contaminated soil and polycyclic aromatic hydrocarbons, applied in the field of contaminated soil remediation, can solve problems such as high cost, secondary pollution, and low efficiency, and achieve the effect of low cost, enhanced removal, and simple process

Inactive Publication Date: 2017-12-15
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of secondary pollution, low efficiency, and high cost existing in the existing polycyclic aromatic hydrocarbon-contaminated soil remediation technology, the present invention proposes a Fenton-like mic

Method used

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  • Method and system for repairing polycyclic aromatic hydrocarbon contaminated soil through fenton-like and microorganism combination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] According to the ratio of 1g glucose, 10g porous foam iron fine particles and 40mL water, first dissolve glucose in water to make glucose solution, then put porous foam iron fine particles into the glucose solution to make a mixed solution; put the above mixed solution in In a high-pressure hydrothermal reactor, heat at 120°C for 6 hours (the pressure in the hydrothermal reactor is 1.0-2.0MPa), after the reaction, take out the fine particles of porous foam iron, wash with deionized water and dry to obtain Carbon coated porous foam iron fine particles.

[0044] The charcoal-coated porous foam iron fine particles, sodium perborate and sodium citrate powder are uniformly mixed in a mass ratio of 70:15:15 to form a mixture.

[0045] The prepared charcoal-coated porous iron foam fine particles, sodium perborate and sodium citrate mixture are charged into the mixture hopper 3. The hydrogen peroxide solution with a mass concentration of 0.05% is charged into the hydrogen pero...

Embodiment 2

[0050] According to the ratio of 2.5g glucose, 5g porous foam iron fine particles and 40mL water, first dissolve glucose in water to make a glucose solution, then put porous foam iron fine particles into the glucose solution to form a mixed solution; the above mixed solution Put it in a high-pressure hydrothermal reaction kettle, heat it at 160°C for 4 hours (the pressure in the hydrothermal reaction kettle is 1.0-2.0MPa), after the reaction, take out the fine particles of porous foam iron, wash with deionized water and dry to prepare The charcoal-coated porous iron foam fine particles are obtained.

[0051] The charcoal-coated porous foam iron fine particles, urea peroxide and potassium citrate powder are uniformly mixed in a mass ratio of 80:10:10 to form a mixture.

[0052] The mixture is charged into the mixture hopper 3. The hydrogen peroxide solution with a mass concentration of 0.05% is charged into the hydrogen peroxide solution storage tank 4 . Sprinkle the mixture ...

Embodiment 3

[0057] According to the ratio of 2g glucose, 15g porous foam iron fine particles and 40mL water, first dissolve glucose in water to make glucose solution, then drop porous foam iron fine particles into the glucose solution to form a mixed solution; put the above mixed solution In a high-pressure hydrothermal reactor, heat at 180°C for 2 hours (the pressure in the hydrothermal reactor is 1.0-2.0MPa), after the reaction, take out the fine particles of porous foam iron, wash with deionized water and dry to obtain Carbon coated porous foam iron fine particles.

[0058] The charcoal-coated porous foam iron fine particles, sodium perborate and sodium citrate powder are uniformly mixed in a mass ratio of 90:5:5 to form a mixture.

[0059] The mixture is charged into the mixture hopper 3. The hydrogen peroxide solution with a mass concentration of 0.05% is charged into the hydrogen peroxide solution storage tank 4 . Sprinkle the mixture evenly into the contaminated soil at a rate of...

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Abstract

The invention discloses a method and system for repairing polycyclic aromatic hydrocarbon contaminated soil through fenton-like and microorganism combination. The method includes the following steps that (1) a mixture of carbon-coated porous foamed iron fine particles and sodium perborate or urea peroxide and citrate is scattered into the contaminated soil; (2) a hydrogen peroxide solution is evenly sprayed into the contaminated soil, polycyclic aromatic hydrocarbon pollutants are enriched and removed, and the foamed iron fine particles are recycled; and (3) mixed bacterium suspension is sprayed into the contaminated soil. The system comprises a material scattering device and a recovery device. The material scattering device comprises a material scattering crawler belt conveyor and a material scattering fixed frame. The material scattering fixed frame is provided with a mixture hopper, a hydrogen peroxide solution storage tank and a sprayer. The recovery device comprises a recovery crawler belt conveyor and a recovery fixed frame. The recovery fixed frame is provided with a magnetic recovery device, a recovery tank, a mixed bacterium suspension storage tank and a sprayer. By means of the method and system, the process is simple, cost is low, sustainability is high, damage to soil microorganisms and organic matter is avoided and the danger of secondary pollution is avoided.

Description

technical field [0001] The invention relates to a method for repairing soil polluted by polycyclic aromatic hydrocarbons, and belongs to the technical field of contaminated soil repair. Background technique [0002] Polycyclic aromatic hydrocarbons are carcinogenic, teratogenic, and mutagenic, and are highly hydrophobic and extremely difficult to be degraded by microorganisms. Therefore, they are widely found in soils rich in organic matter, and polycyclic aromatic hydrocarbons in soil account for more than 90% of the total reserves of all environments . With the acceleration of industrialization, the large-scale use and discharge of polycyclic aromatic hydrocarbons has caused the accumulation of polycyclic aromatic hydrocarbons in the soil, which has caused a great threat to human health and the ecological environment. Remediation of polycyclic aromatic hydrocarbons polluted soil has become an ecological environment field. research hotspots. [0003] The remediation metho...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08B09C1/10
CPCB09C1/00B09C1/08B09C1/10
Inventor 张小梅吴娟马东柴超郑永权柳修楚
Owner QINGDAO AGRI UNIV
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