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Method and system for combined remediation of polycyclic aromatic hydrocarbon-polluted soil in in-situ chemical and biological mode

A polycyclic aromatic hydrocarbon and combined restoration technology, applied in the field of farmland soil, can solve the problems of high cost, secondary pollution, and low efficiency, and achieve the effect of low cost, enhanced removal, and simple process

Inactive Publication Date: 2018-01-19
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 farmland soil remediation technology, the present invention proposes an in-situ chemical and biological A method for joint remediation of polycyclic aromatic hydrocarbon-contaminated soil, while providing a system for implementing the method

Method used

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  • Method and system for combined remediation of polycyclic aromatic hydrocarbon-polluted soil in in-situ chemical and biological mode

Examples

Experimental program
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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] Detect the content of polycyclic aromatic hydrocarbons and the mass fraction of each ring in the contaminated soil to be remediated. The test results showed that the content of polycyclic aromatic hydrocarbons was 1.2 mg / kg, the mass fraction o...

Embodiment 2

[0050] The difference between this embodiment and Example 1 is that the bacterial suspension of Mycobacterium lightens P6 and Burkholderia lxb-5 is made into a mixed bacterial suspension at a volume ratio of 1:2.5. Spray the mixed bacterial suspension into the fully degraded contaminated soil at a rate of 500mL per square meter of contaminated soil.

Embodiment 3

[0052] According to the ratio of 1.5g glucose, 12g 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; mix the above mixed solution Put it in a high-pressure hydrothermal reaction kettle, heat at 120°C for 6 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.

[0053] 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.

[0054] Detect the content of polycyclic aromatic hydrocarbons and the mass fraction of each ring in the contaminated soil to be remediated. The test results showed that the content of polycyclic aromatic hydr...

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Abstract

The invention discloses a method and system for combined remediation of polycyclic aromatic hydrocarbon-polluted soil in an in-situ chemical and biological mode. The method includes the following steps that (1) carbon-coated porous foam iron subparticles and a mixture of sodium perborate or urea peroxide and citrate are scattered into the polluted soil; (2) a hydrogen peroxide solution is sprayedinto the polluted soil, and after pollutants in the soil are fully degraded, the carbon-coated porous foam iron subparticles are recycled; and (3) degrading bacterium suspension is sprayed into the polluted soil. The system comprises a material scattering device and a recycling device. The material scattering device comprises a material scattering movable frame. The material scattering movable frame is provided with a mixture hopper, a hydrogen peroxide solution storage tank and spray heads. The recycling device comprises a recycling movable frame. The recycling movable frame is provided witha magnetic recycling device, a recycling tank, a mixed bacterium suspension storage tank and spray heads. By adoption of the method and system, the process is simple, cost is low, sustainability is high, damage to soil microorganisms and organic substances is evaded and the danger of secondary pollution can be avoided.

Description

technical field [0001] The invention relates to a method for remediating farmland soil polluted by polycyclic aromatic hydrocarbons through chemical and biological combination, and belongs to the technical field of remediation of polluted farmland soil. 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 farmland soil polluted by polycyclic aromatic hydrocarbons has become an e...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08B09C1/10
Inventor 柴超吴娟马东张小梅柳修楚郑永权
Owner QINGDAO AGRI UNIV
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