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Modifier enhanced thermal desorption remediation method for polycyclic aromatic hydrocarbon contaminated site

A polycyclic aromatic hydrocarbon and remediation method technology, applied in the field of polycyclic aromatic hydrocarbon contaminated soil remediation, can solve the problems of heat treatment, energy-intensive soil damage and unsustainability, and achieve the effect of improving remediation cost-effectiveness, improving remediation effect, and reducing damage.

Active Publication Date: 2021-08-20
江苏南京地质工程勘察院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While thermal desorption can quickly and reliably remediate PAHs-contaminated soils, the energy-intensive nature and destructive nature of thermal treatment makes it unsustainable.

Method used

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  • Modifier enhanced thermal desorption remediation method for polycyclic aromatic hydrocarbon contaminated site
  • Modifier enhanced thermal desorption remediation method for polycyclic aromatic hydrocarbon contaminated site
  • Modifier enhanced thermal desorption remediation method for polycyclic aromatic hydrocarbon contaminated site

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Effect test

Embodiment 1

[0029] An embodiment of the present invention provides a modifier-enhanced thermal desorption repair method for a PAHs-contaminated site, the method comprising the following steps:

[0030] (1) The contaminated soil was pretreated, crushed, ground and passed through a 1-2mm sieve, and the moisture content of the PAHs-stained soil was adjusted to 16%, to obtain a spare soil sample;

[0031] (2) Add 5wt% CuCl to the spare soil sample by dry mixing method 2 , followed by stirring with an overturning oscillator, the stirring speed is 30rpm modifier for modification treatment, after 24 hours of treatment, modified soil is obtained;

[0032] (3) The modified soil was subjected to modifier-enhanced thermal desorption treatment at 100° C. for 30 minutes, and after the desorption treatment, cooled to room temperature to obtain the repaired soil.

Embodiment 2

[0034] (1) The contaminated soil was pretreated, crushed, ground and passed through a 1-2mm sieve, and the moisture content of the PAHs-stained soil was adjusted to 16%, to obtain a spare soil sample;

[0035] (2) Add 5wt% granular activated carbon to the spare soil sample by dry mixing method, then stir with an overturning oscillator, and the stirring speed is 30rpm modifier for modification treatment, and obtain modified soil after 24 hours of treatment;

[0036] (3) The modified soil was subjected to modifier-enhanced thermal desorption treatment at 100° C. for 30 minutes, and after the desorption treatment, cooled to room temperature to obtain the repaired soil.

Embodiment 3

[0038] (1) The contaminated soil was pretreated, crushed, ground and passed through a 1-2mm sieve, and the moisture content of the PAHs-stained soil was adjusted to 16%, to obtain a spare soil sample;

[0039] (2) Add 2wt% FeCl to the spare soil sample by dry mixing method 3 , followed by stirring with an overturning oscillator, the stirring speed is 30rpm modifier for modification treatment, after 24 hours of treatment, modified soil is obtained;

[0040] (3) The modified soil was subjected to modifier-enhanced thermal desorption treatment at 100° C. for 30 minutes, and after the desorption treatment, cooled to room temperature to obtain the repaired soil.

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Abstract

The invention relates to a modifier enhanced thermal desorption remediation method for a polycyclic aromatic hydrocarbon (PAHs) contaminated site, which comprises the steps of (1) pretreating contaminated soil, crushing, grinding, screening, and adjusting the moisture content of the PAHs contaminated soil to obtain a standby soil sample; (2) adding a modifier into the standby soil sample by adopting a dry mixing method, and carrying out modification treatment for 24 hours to obtain modified soil; and (3) carrying out modifier enhanced thermal desorption treatment on the modified soil at the temperature of 100-300 DEG C for a certain time, and cooling after thermal desorption treatment to obtain the remediated soil. According to the method, the PAHs contaminated soil is modified through the modifier to strengthen the thermal desorption process of the PAHs, so that the desorption efficiency of the whole thermal desorption process is improved, the remediation cost is reduced, the cost effectiveness of the thermal desorption technology is also improved, and the method has a good application prospect.

Description

technical field [0001] The invention belongs to the field of remediation of polycyclic aromatic hydrocarbons (PAHs) polluted soil, in particular to a modifier-enhanced thermal desorption remediation method for remediating PAHs-contaminated sites, and belongs to the ex-situ enhanced thermal desorption remediation technology. Background technique [0002] With the continuous acceleration of my country's modernization process and the rapid development of economy, the consumption of petroleum, coal, biomass and other energy sources has increased significantly, which has caused the pollution level of PAHs in my country's environment to increase year by year. PAHs have a long pollution cycle and are difficult to degrade. They can migrate with the medium for a long distance, and eventually accumulate in large quantities in soil with strong adsorption. PAHs are very destructive to animals and plants, can cause plant leaves to curl, shrink and fall off, change animal reflex activitie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B09C1/08C09K17/04
CPCB09C1/06B09C1/08C09K17/04Y02A50/20
Inventor 徐成华张亚平陈春红刘刚于天施威
Owner 江苏南京地质工程勘察院
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