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Chemical oxidation repair method of polycyclic aromatic hydrocarbon (PAH) contaminated soil

A technology of polluted soil and chemical oxidation, which is applied in the field of soil remediation, can solve the problems of complex chemical pretreatment process and difficult mud treatment, and achieve the effects of simple chemical types, easy stacking and good treatment effect

Inactive Publication Date: 2018-09-07
CCCC TDC ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the existing chemical oxidation remediation technology has a good remediation effect on PAH-contaminated soil, but there are also problems such as complex chemicals, many pretreatment procedures, and difficult handling of the remediation mud.

Method used

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  • Chemical oxidation repair method of polycyclic aromatic hydrocarbon (PAH) contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 500 tons of PAH-contaminated soil, use screening equipment to screen out construction waste with a particle size greater than 50 mm, and send the screened contaminated soil to crushing equipment for crushing to obtain fine-grained contaminated soil with an average particle size of 20 mm. The construction waste obtained by sieving is rinsed with 0.2 wt.% sodium persulfate solution to obtain clean construction waste. Add 2.5 tons of sodium persulfate and an appropriate amount of water to the fine-grained polluted soil, mix the polluted soil 3 times with an ALLU bucket to obtain a soil with a moisture content of 30%; place the mixed soil after the dosing Store and maintain in a cool place for 6 days to obtain repaired and up-to-standard soil.

Embodiment 2

[0032] Take 500 tons of PAH-contaminated soil, use screening equipment to screen out construction waste with a particle size greater than 50 mm, and send the screened contaminated soil to crushing equipment for crushing to obtain fine-grained contaminated soil with an average particle size of 15 mm. The construction waste obtained by sieving is washed with a sodium persulfate solution with a concentration of 2 wt.%, to obtain clean construction waste. Add 10 tons of sodium persulfate and an appropriate amount of water to the fine-grained polluted soil, mix the polluted soil 4 times with an ALLU bucket to obtain a soil with a moisture content of 30%; place the mixed soil after the dosing Store and maintain in a cool place for 8 days to obtain repaired and up-to-standard soil.

Embodiment 3

[0034] Take 500 tons of PAH-contaminated soil, use screening equipment to screen out construction waste with a particle size greater than 50 mm, and send the screened contaminated soil to crushing equipment for crushing to obtain fine-grained contaminated soil with an average particle size of 5 mm. The construction waste obtained by sieving is washed with a sodium persulfate solution with a concentration of 1 wt.%, to obtain clean construction waste. Add 5 tons of sodium persulfate and an appropriate amount of water to the fine-grained polluted soil, mix the polluted soil 3 times with an ALLU bucket to obtain a soil with a moisture content of 35%; place the mixed soil after the dosing Store and maintain in a cool place for 7 days to obtain repaired and up-to-standard soil.

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Abstract

The invention relates to a chemical oxidation repair method of polycyclic aromatic hydrocarbon (PAH) contaminated soil, belonging to the technical field of soil remediation. The chemical oxidation repair method of the PAH contaminated soil is characterized by comprising the following technological processes: (1) screening and crushing: screening the PAH contaminated soil to remove construction wastes with particle sizes larger than 50 mm, and then sending the screened contaminated soil to crushing equipment for crushing so as to obtain fine-grained contaminated soil with particle sizes smallerthan or equal to 20mm; (2) feeding chemical and mixing: adding a sodium persulfate agent in to fine-grained contaminated soil, and mixing; (3) stockpiling and curing: placing the soil, mixed with thechemical, in a cool place, and stockpiling and curing for 6-8 days so as to obtain chemically oxidized repaired soil. The chemical oxidation repair method of the PAH contaminated soil has the advantages of being short in technological process, high in treatment efficiency, easy in engineering application, remarkable in economic, environmental and social benefits, and the like.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, in particular to a method for chemical oxidation remediation of polycyclic aromatic hydrocarbon contaminated soil. Background technique [0002] Polycyclic aromatic hydrocarbons refer to hydrocarbons containing two or more benzene rings in their molecules, including more than 150 compounds such as naphthalene, anthracene, phenanthrene, and pyrene, which are carcinogenic, teratogenic, and mutagenic. The chemical properties of polycyclic aromatic hydrocarbons are highly stable, and they are difficult to degrade in the natural environment, causing long-term pollution to soil and groundwater, which greatly threatens human health. Therefore, PAH-contaminated soil remediation has become a hot issue in the soil remediation industry. [0003] At present, the remediation methods of PAH-contaminated soil mainly include chemical oxidation, pyrolysis, biological remediation and composite remediatio...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 王琦杨健梁文龙
Owner CCCC TDC ENVIRONMENTAL ENG
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