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Chemical repairing method for polycyclic aromatic hydrocarbon polluted soil

A technology for polluted soil and polycyclic aromatic hydrocarbons, which is applied in the restoration of polluted soil and other directions, can solve problems such as unsatisfactory treatment effects, and achieve the effects of delaying the oxidation reaction rate, reducing the cost of remediation treatment, and improving the removal efficiency.

Inactive Publication Date: 2019-10-22
上海傲江生态环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is carried out in order to solve the above problems, and the purpose is to provide a chemical repair method for soil polluted by polycyclic aromatic hydrocarbons, which overcomes the problem of unsatisfactory treatment effect of the traditional Fenton oxidation method, not only has high treatment efficiency, is environmentally friendly, and has low energy consumption. It can also be widely used in the remediation of PAH-contaminated sites

Method used

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  • Chemical repairing method for polycyclic aromatic hydrocarbon polluted soil

Examples

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Effect test

Embodiment 1

[0045] Use an excavator to take 100 tons of polycyclic aromatic hydrocarbon-contaminated soil, use a screening and crushing bucket to screen and remove construction waste larger than 50 mm, and crush the screened contaminated soil. After crushing, the particle size of the soil can be reduced to less than 50 mm. Add 20kg EDTA and 100kg ferrous sulfate to the pretreated soil after sieving and crushing, and stir and mix with a sieving and crushing bucket. Then add 400kg of sodium persulfate and an appropriate amount of water to the soil, and stir with a sieve breaker. The soil after adding the medicine and mixing is placed in the temporary storage area for maintenance for 7 days, and the soil that meets the repair standard is obtained.

Embodiment 2

[0047] Use an excavator to take 100 tons of polycyclic aromatic hydrocarbon-contaminated soil, use a sieving bucket to sieve and remove construction waste larger than 50mm, and crush the sieved contaminated soil. After crushing, the particle size of the soil can be reduced to less than 50mm. Add 40kg EDTA and 200kg ferrous sulfate to the pretreated soil after sieving and crushing, and stir and mix with a sieving and crushing bucket. Then add 800kg of sodium persulfate and an appropriate amount of water to the soil, and mix with a sieve breaker. The soil after adding the medicine and mixing is placed in the temporary storage area for maintenance for 7 days, and the soil that meets the repair standard is obtained.

Embodiment 3

[0049] Use an excavator to take 100 tons of polycyclic aromatic hydrocarbon-contaminated soil, use a sieving bucket to sieve and remove construction waste larger than 50mm, and crush the sieved contaminated soil. After crushing, the particle size of the soil can be reduced to less than 50mm. Add 60kg NTA and 300kg ferrous sulfate to the pretreated soil after sieving and crushing, and stir and mix with a sieving and crushing bucket. Then add 1.2 tons of sodium persulfate and an appropriate amount of water to the soil, and mix with a sieving and breaking bucket. The soil after adding the medicine and mixing is placed in the temporary storage area for maintenance for 7 days, and the soil that meets the repair standard is obtained.

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Abstract

The invention discloses a chemical repairing method for polycyclic aromatic hydrocarbon polluted soil. The chemical repairing method comprises the following steps: performing primary dosing, namely putting a chelating agent which accounts for 0.02-0.1% of the mass of pretreated soil and ferrous sulfate which accounts for 0.1-0.5% of the mass of the pretreated soil into the pretreated soil, and sufficiently stirring and mixing to obtain a first soil mixture; performing secondary dosing, namely putting sodium persulfate and water which account for 0.4-2% of the mass of the pretreated soil into the first mixture, and sufficiently stirring and mixing to obtain a second soil mixture; performing soil piling, namely piling and maintaining the second soil mixture for 5-7 days, thereby obtaining repaired soil, wherein the mass water content of the second soil mixture is 25-35%; the mass ratio of the sodium persulfate to the chelating agent to the ferrous sulfate is (20:1:5)-(20:1:10). The soilrepairing method disclosed by the invention overcomes the problem that a conventional oxidation method is not ideal in treatment effect, not only is high in treatment efficiency, environmentally friendly and low in energy consumption, but also can be widely applied to repairing of a polycyclic aromatic hydrocarbon polluted field.

Description

technical field [0001] The invention relates to a method for remediating polluted soil, in particular to a method for chemically remediating soil polluted by polycyclic aromatic hydrocarbons. Background technique [0002] Polycyclic aromatic hydrocarbons contain two or more benzene rings and are volatile hydrocarbons produced when organic substances are incompletely burned. Polycyclic aromatic hydrocarbons (PAHs) are persistent organic pollutants with large quantities and widely distributed in the environment. Polycyclic aromatic hydrocarbons are very harmful to human beings, and many kinds of polycyclic aromatic hydrocarbons have been identified as carcinogenic. The remediation of PAH-contaminated soil in industrial sites has become a difficult and hot topic in the soil remediation industry. [0003] PAH-contaminated soils can be degraded or metabolized through a variety of ways, the main methods are chemical oxidation, thermal desorption, biological remediation and compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 刘勇付奕舒
Owner 上海傲江生态环境科技有限公司