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Method for removing polycyclic aromatic hydrocarbon in soil through hydrothermal carbon reinforced washing

A polycyclic aromatic hydrocarbon and hydrothermal carbon technology, applied in the field of environmental remediation, can solve the problems of non-reuse of washing liquid and loss of detergent, and achieve the effects of reducing post-treatment costs, less pollution and high removal rate

Pending Publication Date: 2021-11-09
SHANGHAI TONGJI CONSTR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a good treatment effect and rapid response, but the washing liquid cannot be reused, and further treatment is required, and the washing agent is also lost

Method used

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  • Method for removing polycyclic aromatic hydrocarbon in soil through hydrothermal carbon reinforced washing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] A method for hydrothermal charcoal enhanced washing to remove polycyclic aromatic hydrocarbons in soil (such as figure 1 shown):

[0037] 1) First prepare hydrothermal carbon, mix waste biomass corn stalks with water at a mass ratio of 1:10, modifying additive glucose (addition amount is 5wt% of the mass of the mixture), stir, heat to a predetermined temperature of 180°C, and keep warm for 8 hours , solid-liquid separation, washing, drying, grinding and sieving for later use;

[0038] 2) Then use a crusher to crush and screen the hydrothermal charcoal and soil, control the hydrothermal charcoal mesh to 60, and the soil mesh to 180; add a certain concentration of detergent (SDBS concentration 20g / L) to the polluted soil , the solid-to-liquid ratio (soil mass: washing liquid mass) is 1:15, and the washing time is 6h to wash, and then add hydrothermal charcoal with a soil mass fraction of 12%, and react in the reactor; solid-liquid separation , the solid part is separate...

Embodiment 2

[0041] A method for hydrothermal charcoal enhanced washing to remove polycyclic aromatic hydrocarbons in soil (such as figure 1 shown):

[0042] 1) First prepare hydrothermal carbon, mix waste biomass corn stalks with water at a mass ratio of 1:50, modifying additive glucose (addition amount is 1wt% of the mass of the mixture), stir, heat to a predetermined temperature of 180°C, and keep warm for 8 hours , solid-liquid separation, washing, drying, grinding and sieving for later use;

[0043] 2) Then use a crusher to crush and screen the hydrothermal charcoal and soil, control the hydrothermal charcoal mesh to 60, and the soil mesh to 180; add a certain concentration of detergent (SDBS concentration 20g / L) to the polluted soil , the solid-to-liquid ratio (soil mass: washing liquid mass) is 1:15, and the washing time is 6h to wash, and then add hydrothermal charcoal with a soil mass fraction of 12%, and react in the reactor; solid-liquid separation , the solid part is separate...

Embodiment 3

[0046] A method for hydrothermal charcoal enhanced washing to remove polycyclic aromatic hydrocarbons in soil (such as figure 1 shown):

[0047] 1) First prepare hydrothermal carbon, mix waste sawdust and water at a mass ratio of 1:50, modifying additive glucose (addition amount is 3wt% of the mass of the mixture), stir, heat to a predetermined temperature of 250°C, keep warm for 6 hours, solid-liquid Separation, washing, drying, grinding and sieving for later use;

[0048] 2) Then use a crusher to crush and screen the hydrothermal charcoal and soil, control the hydrothermal charcoal mesh to 100, and the soil mesh to 220; add a certain concentration of detergent (SDS concentration 30g / L) to the polluted soil , the solid-to-liquid ratio (soil mass: washing liquid mass) is 1:30, and the washing time is 4h to wash, and then add hydrothermal charcoal with a soil mass fraction of 12%, and react in the reactor; solid-liquid separation , the solid part is separated and recovered fr...

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Abstract

The invention discloses a method for removing polycyclic aromatic hydrocarbon in soil through hydrothermal carbon reinforced washing. The method comprises the following steps: respectively crushing and screening hydrothermal carbon and soil by using a crusher, wherein the particle sizes of the hydrothermal carbon and soil are different, and screening is facilitated after subsequent mixing; adding a detergent into soil for washing, adding hydrothermal carbon, and conducting reacting in a reactor; after the reaction is finished, conducting solid-liquid separation, separating and recovering hydrothermal carbon in the soil from the solid part through a screening method, and using the hydrothermal carbon for adsorbing the liquid part, namely pollutants in washing waste liquid; and separating hydrothermal carbon separated from the washing waste liquid and conducting recycling after washing and regeneration, and conducting organic matter extraction on the washing waste liquid enriched with pollutants. The process is simple, the device composition is simple, operation is easy, the removal rate is high, aftertreatment of the washing waste liquid is integrally achieved, pollution is small, the regenerated liquid obtained after adsorption can be continuously and circularly used for washing and removing soil pollutants, the aftertreatment cost of the washing waste liquid is greatly reduced, and cyclic utilization of resources is achieved.

Description

technical field [0001] The invention relates to a polycyclic aromatic hydrocarbon-contaminated soil remediation technology, in particular to a method for improving the removal rate of organic matter by modified hydrothermal carbon enhanced washing of polycyclic aromatic hydrocarbons in soil, and belongs to the technical field of environmental restoration. Background technique [0002] Polycyclic aromatic hydrocarbons refer to aromatic hydrocarbons containing two or more benzene rings, mostly colorless, white or light yellow crystals, slightly soluble or insoluble in water, poor water solubility, high octanol-water partition coefficient, physical and chemical Stable in nature, it is a refractory persistent organic pollutant with low bioavailability and mainly exists in the soil environment. Polycyclic aromatic hydrocarbons exist in the soil and destroy the physical and chemical properties of the soil itself. The normal physiological and metabolic functions of animals, plants ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/00
CPCB09C1/02B09C1/00
Inventor 顾峥李利兴梁玺静
Owner SHANGHAI TONGJI CONSTR TECH
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