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Green restoration method of organic contaminated soil

A technology of organic pollution and remediation methods, applied in the field of soil remediation and waste recycling, can solve the problems of biochar treatment of pollutants and re-precipitation of secondary pollution, failure to achieve degradation, etc., and achieves improved physical and chemical properties, easy operation and low price. Effect

Inactive Publication Date: 2018-12-18
SHANGHAI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Due to its unique physical and chemical properties and rich specific surface area, biochar can adsorb organic pollutants in the soil to achieve the purpose of transferring pollutants. Although the biochar remediation method can better overcome the damage to soil structure and composition, this method is only Simply transferring pollutants through adsorption does not achieve the purpose of degradation, and there will be problems such as the treatment of biochar after adsorption and the re-precipitation of pollutants to cause secondary pollution.

Method used

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  • Green restoration method of organic contaminated soil
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Examples

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Embodiment 1

[0024] In this example, a green restoration method for organically polluted soil, using hydrothermal charcoal and H 2 o 2 Perform heterogeneous catalytic reaction to generate strong oxidizing groups to degrade organic pollutants in soil. The specific steps are as follows:

[0025] a. Using wheat straw as a raw material, washing, crushing and grinding the wheat straw, passing through a 100-mesh sieve, and selecting the part under the sieve to obtain wheat straw powder as a powdery carbon source;

[0026] b. take by weighing 20g of the wheat straw powder obtained in said step a, and take by weighing 1g of FeCl 3 Dissolve in 100ml of deionized water and mix with wheat straw powder evenly, then pour it into the autoclave. The mixed wheat straw powder mixture is in a semi-solid state. The wheat straw powder mixture is used as a reactant, and the reactor is filled with inert gas N 2 Exhaust for 15 minutes. After the ventilation is complete, put the lid on the reaction kettle and p...

Embodiment 2

[0041] This embodiment is basically the same as Embodiment 1, especially in that:

[0042] In this example, a green restoration method for organically polluted soil, using hydrothermal charcoal and H 2 o 2 Perform heterogeneous catalytic reaction to generate strong oxidizing groups to degrade organic pollutants in soil. The specific steps are as follows:

[0043] a. using pomelo peel in the fruit and vegetable peel as a raw material, washing the pomelo peel, crushing and grinding it, passing through a 100-mesh sieve, and selecting the part under the sieve to obtain pomelo peel powder as a powdery carbon source;

[0044] b. take by weighing 20g of pomelo peel powder gained in said step a, and take by weighing 1g of FeCl 3 Dissolve in 100ml of deionized water, mix evenly with pomelo peel powder and pour it into the autoclave. The mixed pomelo peel powder mixture is in a semi-solid state. The pomelo peel powder mixture is used as a reactant, and the reaction kettle is filled wi...

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Abstract

The invention discloses a green restoration method of organic contaminated soil. The green restoration method is used for the technical fields of organic contaminated soil restoration and waste recycling. The green restoration method is different from a conventional charcoal adsorption soil organic contaminant restoration method in that environmentally-persistent free radicals with oxidative activity on the surface of hydrothermal charcoal and H2O2 carry out heterogeneous catalysis degradation on soil organic contaminants. Under the condition of normal pressure and temperature, the organic contaminated soil, the hydrothermal charcoal and H2O2 are mixed to be uniform according to the mass ratio of the organic contaminated soil to the hydrothermal charcoal of 5:1 to 20:1 and the solid-to-liquid ratio of the organic contaminated soil to H2O2 of 2:1 to 10:1 to synergistically remove the organic contaminants in the soil. The contaminant removal rate in the organic contaminated soil is increased, meanwhile, no contaminant precipitation or secondary pollution is generated in a reaction system, and no soil structure or ingredients are damaged inevitably. The method is simple in process, economical, efficient and environmentally friendly, and has great application potential in the field of organic contaminated soil restoration.

Description

technical field [0001] The invention relates to a method for repairing soil, in particular to a method for degrading organic pollutants in soil, which is applied in the technical fields of soil repair and waste recycling. Background technique [0002] There are many technologies for remediating organically polluted soil. When selecting a specific soil remediation technology, it is necessary to make a comprehensive comparison based on the pollutants and soil properties, treatment time, cost and other factors, and choose the appropriate remediation technology. At present, thermal desorption technology, soil gas phase extraction, bioremediation, etc. are widely used remediation technologies for organic contaminated soil. [0003] Thermal desorption remediation technology is to make the organic pollutants adsorbed in the soil reach the boiling point and volatilize into a gaseous state by heating, and then separate them for treatment. It is mainly used to treat halogenated organi...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 阮秀秀杜巍萌郭凡可汤育圆钱光人
Owner SHANGHAI UNIV
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