Method for remediating polycyclic aromatic hydrocarbon composite contaminated soil by utilizing sulfate radical free radical advanced oxidation technology

A technology for polluted soil and polycyclic aromatic hydrocarbons, applied in the field of soil remediation, can solve the problems of low removal efficiency of PAHs, increase the difficulty of soil remediation, affect removal efficiency, etc. Effect

Active Publication Date: 2019-02-05
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In actual PAHs-contaminated site remediation, the direct application of sulfate radical advanced oxidation technology has certain limitations. Long-term compound pollution, complex composition increases the difficulty of soil remediation; 2. Fe in sulfate radical advanced oxidation technology 2+ Easily oxidized to Fe in soil environment 3+ , thus affecting SO 4 The formation of - affects the removal efficiency; 3. After a long period of aging, the site PAHs are more in a bound state, which is difficult to use and decompose, resulting in low removal efficiency of PAHs in contaminated soil when using this technology

Method used

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  • Method for remediating polycyclic aromatic hydrocarbon composite contaminated soil by utilizing sulfate radical free radical advanced oxidation technology
  • Method for remediating polycyclic aromatic hydrocarbon composite contaminated soil by utilizing sulfate radical free radical advanced oxidation technology
  • Method for remediating polycyclic aromatic hydrocarbon composite contaminated soil by utilizing sulfate radical free radical advanced oxidation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The removal rate of sodium persulfate and ferrous ion to PAHs in polluted soil of embodiment 1

[0030] The soil of a PAHs-contaminated site was selected for advanced oxidation remediation of sulfate radicals, and the ratios of different ferrous ions and sodium persulfate were adjusted in order to obtain optimized degradation efficiency. The characteristics of PAHs pollution in the soil of the site are shown in Table 1.

[0031] Table 1 Contents of 16 PAHs in polluted soil

[0032]

[0033] Impurities in the PAH-contaminated soil were removed and the soil was air-dried, and the air-dried soil was crushed and passed through a 20-mesh sieve. The test soil that takes 5g polycyclic aromatic hydrocarbon pollution is placed in the 30ml brown glass bottle, sodium persulfate and ferrous ion of different concentrations are set, 1) sodium persulfate 0mmol / g, ferrous ion 0mmol / g (FOS0). 2) Sodium persulfate 0mmol / g, ferrous ion 0.5mmol / g (F0.5S0). 3) Sodium persulfate 1mmol / ...

Embodiment 2

[0036] Example 2 Adding chelating agent to remove PAHs in polluted soil under the optimum concentration of sodium persulfate and ferrous ion

[0037] On the basis of the sodium persulfate of 5mmol / g and the ferrous sulfate of 0.5mmol / g in Example 1, different types of chelating agents are added, 1) oxalic acid, 2) sodium oxalate, 3) citric acid, 4) Sodium citrate, 5) EDTA, 6) potassium dihydrogen phosphate, 7) sodium pyrophosphate. Set the same concentration as 0.5mmol / g and the rest of the steps are the same as in Example 1.

[0038] Such as image 3 As shown, the results showed that the addition of citric acid to different chelating agents had the highest improvement in the removal efficiency of PAHs in contaminated soil, reaching 49.9%, and the lowest was sodium oxalate at 35.0%.

[0039] Compare the removal efficiency of PAHs with different ring numbers, such as Figure 4 As shown, the removal rate of tetracyclic PAHs in polluted soil was further optimized by adding citri...

Embodiment 3

[0040] Embodiment 3 adds surfactant on the basis of optimal chelating agent to remove PAHs in polluted soil

[0041] On the basis of adding 0.5mmol / g of citric acid as a chelating agent in Example 2, it is set to add different types of surfactants: 1) Brij-35 (polyoxyethylene lauryl ether), 2) HPCD (hydroxypropyl-β -cyclodextrin), 3) APG (AlkylPolyglycoside, alkyl glycoside), 4) CA-720, each surfactant has 4 different concentrations, which are 500mg / l, 1000mg / l, 1500mg / l, 2000mg / l respectively, and the amount added is 900μL of surfactant solution for each treatment (that is, every 5 grams soil plus 900 μL surfactant solution). All the other steps are the same as in Example 2.

[0042] Such as Figure 5 As shown, the results show that in different surfactants CA-720 has the highest improvement in the degradation efficiency of PAHs in contaminated soil, with a removal rate of 80.8%, and Brij-35 is the lowest, with a removal rate of 69.7%.

[0043] Compare the removal effi...

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Abstract

The invention discloses a method for remediating polycyclic aromatic hydrocarbon composite contaminated soil by utilizing a sulfate radical free radical advanced oxidation technology. The method comprises the steps of adding sodium persulfate, ferrous sulfate, citric acid and Igepal CA-720 into soil to be remediated, and reacting at 25 to 28 DEG C in dark place for 20 to 30 hours. According to themethod provided by the invention, the efficiency on removing PAHs of the soil reaches up to 80.8 percent, the removal rate of the PAHs in the contaminated soil is remarkably improved, the substrate action range is extended, the effect on removing tetracyclic PAHs is remarkably improved, the effect on removing other tricyclic and hexacyclic PAHs in the soil is further improved, and the applicationrange of the technology aiming at PAHs pollutants is further extended.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and relates to a method for remediating polycyclic aromatic hydrocarbon compound polluted soil by using sulfate radical advanced oxidation technology. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of condensed ring compounds containing two or more benzene rings arranged in linear, angular or clustered shapes, with high melting and boiling points, strong hydrophobicity, low vapor pressure, octanol - Features such as high water partition coefficient. Its sources mainly include natural existence, incomplete combustion of fossil fuels, organic synthetic materials and refinery production. [0003] PAHs have been proved to have "three effects" of carcinogenicity, teratogenicity and mutagenicity, which pose a considerable threat to the safety of agricultural products and human health. Therefore, the problem of PAHs pollution has attracted widespread attenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/40
CPCB09C1/08C09K17/40
Inventor 徐莉徐源洲张力浩魏志敏赵晨雨张旭辉孙斌李辉信胡锋
Owner NANJING AGRICULTURAL UNIVERSITY
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