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A system and method for remediating polycyclic aromatic hydrocarbon-contaminated soil

A technology for contaminated soil and polycyclic aromatic hydrocarbons, applied in the field of organic contaminated soil remediation, can solve the problem of lack of polycyclic aromatic hydrocarbons polluted soil and other issues

Active Publication Date: 2019-08-23
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a system and method for remediating polycyclic aromatic hydrocarbon-contaminated soil, which is used to solve the lack of using chemical oxidation combined with low-temperature thermal desorption to repair polycyclic aromatic hydrocarbons in the prior art. Problems with systems and methods for polluting soil

Method used

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  • A system and method for remediating polycyclic aromatic hydrocarbon-contaminated soil

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Effect test

Embodiment 1

[0145] The site polluted by polycyclic aromatic hydrocarbons was originally an electrical appliance company, and the soil around the site was polluted by polycyclic aromatic hydrocarbons produced by processing products for many years. The scale of polluted soil is 7200m 3 , the highest detected concentration of benzo(a)anthracene in contaminated soil was 2.1mg / kg, the highest detected concentration of benzo(b)fluoranthene was 4mg / kg, the highest detected concentration of benzo(a)pyrene was 2.6mg / kg, and the soil moisture content was 36%.

[0146] A system for repairing polycyclic aromatic hydrocarbon-contaminated soil of the present invention is used to repair the above-mentioned contaminated soil, and the specific process is as follows:

[0147] Put the excavated polluted soil into the material storage device (material storage bin) in the soil pretreatment equipment, and the polluted soil in the material storage device passes through the first outlet and passes through the c...

Embodiment 2

[0153] Near a rolling mill, the scale of polluted soil is 6250m 3 , the highest detected concentration of benzo(a)anthracene in contaminated soil was 2.7mg / kg, the highest detected concentration of benzo(b)fluoranthene was 4.2mg / kg, the highest detected concentration of benzo(a)pyrene was 2.1mg / kg, and the soil moisture The rate is 32%.

[0154] A system for repairing polycyclic aromatic hydrocarbon-contaminated soil of the present invention is used to repair the above-mentioned contaminated soil, and the specific process is as follows:

[0155] Put the excavated polluted soil into the material storage device (material storage bin) in the soil pretreatment equipment, and the polluted soil in the material storage device passes through the first outlet and passes through the conveyor belt to the primary screening device (drum sieve). After the first feed port enters the primary screening device for preliminary screening, the soil with a particle size of not less than 50mm is di...

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Abstract

The invention provides a system for repairing polycyclic aromatic hydrocarbon contaminated soil. The system is provided with soil pretreatment equipment, chemical oxidation equipment, thermal desorption equipment, soil accumulation equipment and flue gas dust removal equipment in sequence. Conveying belts are arranged between the soil pretreatment equipment, the chemical oxidation equipment, the thermal desorption equipment and the soil accumulation equipment. The thermal desorption equipment communicates with the flue gas dust removal equipment through a pipeline. The soil accumulation equipment communicates with the soil pretreatment equipment through a pipeline. The invention further provides a method for repairing the polycyclic aromatic hydrocarbon contaminated soil. According to the system and method for repairing the polycyclic aromatic hydrocarbon contaminated soil, chemical oxidation and low-temperature thermal desorption are combined, and therefore the removal rate of polycyclic aromatic hydrocarbon of the soil can reach 99%, the repairing effect of the contaminated soil can be effectively improved, and the repairing period can be effectively shortened.

Description

technical field [0001] The invention belongs to the technical field of remediation of organic polluted soil, and relates to a system and method for remediating polycyclic aromatic hydrocarbon-contaminated soil, in particular to a system and method for remediating polycyclic aromatic hydrocarbon-contaminated soil and sludge using chemical oxidation combined with low-temperature thermal desorption method. Background technique [0002] In recent years, along with the adjustment of my country's urban layout and the upgrading of industrial structure, a large number of polluting enterprises have been relocated in various cities, resulting in a large number of polluted sites left in urban areas, seriously hindering urban construction and local economic development, restricting It is the secondary development and utilization of urban land resources. Most of these polluted sites used to be coal chemical, petroleum, plastic, coking and other chemical industries, so the soil was enrich...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/06
CPCB09C1/06B09C1/08
Inventor 江闯陈辉洋陈良才唐秀华魏宏斌
Owner TONGJI UNIV
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