Combined remediation method of polycyclic aromatic hydrocarbon polluted soil

A technology for polluted soil and polycyclic aromatic hydrocarbons, applied in the field of soil remediation, can solve the problems of long time remediation by microbial remediation, can not completely solve the pollution of polycyclic aromatic hydrocarbons, and the effect of remediation is not significant, and achieves low cost and reduced polycyclic aromatic hydrocarbons. Aromatic content, the effect of simple steps

Active Publication Date: 2015-04-08
JIANGSU GAIYA ENVIRONMENTAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional remediation methods used to remediate polycyclic aromatic hydrocarbon pollution in soil are mostly microbial remediation methods. The remediation time of microbial remediation methods is too long, and the effect of remediation is not significant, which cannot completely solve the problem of polycyclic aromatic hydrocarbon pollution. The method of the present invention The purpose is to provide a joint repair method for polycyclic aromatic hydrocarbon pollution to solve the above problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Put PAH-contaminated soil in a bioreactor, add water at room temperature and stir, the weight ratio of soil to water is 1:9; (2) Add subtilisin and Bacillus subtilis to the bioreactor The amount of protease added is 30U / g soil, after adding, stir, and the stirring speed is 30rpm; (3) When stirring, add sodium palmitate and methyl palmitate to the bioreactor, and the amount of sodium palmitate is the weight of the soil 5wt%, the amount of methyl palmitate was 0.8wt% of the soil weight, and continued to stir after adding; (4) Add cotton straw powder to the bioreactor, the amount of cotton straw powder added was 4.5wt%, and continued to stir for 2 hours after adding After standing still, the soil is separated from the water and dried, which is the repaired soil.

Embodiment 2

[0020] (1) Put PAH-contaminated soil in a bioreactor, add water at room temperature and stir, the weight ratio of soil to water is 1:6; (2) Add subtilisin and Bacillus subtilis to the bioreactor The amount of protease added is 5U / g soil, after adding, stir, and the stirring speed is 30rpm; (3) When stirring, add sodium palmitate and methyl palmitate to the bioreactor, and the amount of sodium palmitate is 1 / 2 of the soil weight 3.5wt%, the amount of methyl palmitate is 1.6wt% of the soil weight, and continue to stir after adding; (4) Add cotton straw powder to the bioreactor, the amount of cotton straw powder added is 1.5wt%, continue to stir after adding After 2 hours, the soil is separated from the water and dried, which is the remediation soil.

Embodiment 3

[0022] (1) Put PAH-contaminated soil in a bioreactor, add water at room temperature and stir, the weight ratio of soil to water is 1:8; (2) Add subtilisin and Bacillus subtilis to the bioreactor The amount of protease added is 20U / g soil, after adding, stir, and the stirring speed is 30rpm; (3) When stirring, add sodium palmitate and methyl palmitate to the bioreactor, and the amount of sodium palmitate is 1 / 2 of the soil weight 4.5wt%, the amount of methyl palmitate is 1.0wt% of the soil weight, and continue to stir after adding; (4) Add cotton straw powder to the bioreactor, the amount of cotton straw powder added is 2wt%, continue to stir for 2 hours after adding After standing still, the soil is separated from the water and dried, which is the repaired soil.

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PUM

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Abstract

The invention belongs to the field of soil remediation, and discloses a combined restoration method of polycyclic aromatic hydrocarbon polluted soil, which comprises the following steps: (1) putting polycyclic aromatic hydrocarbon polluted soil in a bioreactor, adding water at room temperature, and stirring; (2) adding 5-30U of subtilisin to every gram soil of into the bioreactor, and stirring at 30 rpm; (3) while stirring, adding sodium palmitate and methyl palmitate into the bioreactor, and continuing stirring, wherein the sodium palmitate accounts for 3.5-5 wt% of the soil, and the methyl palmitate accounts for 0.8-1.6 wt% of the soil; and (4) adding cotton straw powder into the bioreactor (the cotton straw powder accounts for 1.5-4.5 wt%), continuing stirring for 2 hours, standing, separating the soil from water, and drying to obtain the remediated soil.

Description

technical field [0001] The invention belongs to the field of soil remediation, and relates to a method for remediating soil contaminated by polycyclic aromatic hydrocarbons, in particular to a combined method for remediating polycyclic aromatic hydrocarbon-contaminated soil. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) refer to hydrocarbons containing two or more benzene rings, which widely exist in nature, with more than 100 types, most of which are carcinogenic and mutagenic. PAHs are formed when fossil fuels, wood, garbage or other organic matter such as tobacco or charred meat are incompletely burned. It is generally believed that PAHs are formed from simple aromatic compounds such as benzene and naphthalene through the addition mechanism of dehydroacetylene. According to the reaction temperature, PAHs with different benzene rings are formed. When the reaction is carried out at a lower temperature, low-molecular polycyclic aromatic hydrocarbons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 程功弼詹晓倩
Owner JIANGSU GAIYA ENVIRONMENTAL SCI & TECH CO LTD
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