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Method for combined remediation of organic matter polluted soil

A technology for contaminated soil and joint remediation, applied in the field of organic-contaminated soil remediation, can solve problems such as high energy consumption, troublesome operating conditions and process steps, and achieve the effects of low operating cost, simple and easy steps, and simple and efficient treatment process.

Inactive Publication Date: 2016-08-10
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the remediation method of the patented organic polluted soil has a relatively good remediation effect, its operating conditions and process steps are relatively troublesome, and the energy consumption is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Anthracene 75.7mg / kg, pyrene 168.6mg / kg, benzopyrene 56.6mg / kg, that is, the polluted soil with a total content of polycyclic aromatic hydrocarbons of 300.9mg / kg was placed in the reactor, and the surfactant dodecyl was added at room temperature. The aqueous solution of sodium benzene sulfonate and sodium dodecyl sulfate is stirred, and the amount of surfactant added is 2% of the added mass of persulfate, and the added mass ratio of sodium dodecyl benzene sulfonate and sodium dodecyl sulfate is 1:1; the weight ratio of soil and water is 1:1; after adding, stir for 1h, and the stirring speed is 30rmp; after 1h, add persulfate (sodium persulfate, potassium persulfate and potassium persulfate in a molar ratio of 3: 3:2 mixture) and activator ferrous sulfate, the molar ratio of the added amount of persulfate to the added amount of ferrous sulfate is 10:1, and the added amount of sodium persulfate is 0.3mol / kg polluted soil; Shake artificially once every 1 h. After 4 h, the ...

Embodiment 2

[0031] Anthracene 300.0mg / kg, pyrene 300.0mg / kg, benzopyrene 50.0mg / kg, that is, the polluted soil with a total polycyclic aromatic hydrocarbon content of 650.0mg / kg, was placed in the reactor, and a surfactant was added to the reactor at room temperature. The aqueous solution, persulfate and activator are stirred, and the weight ratio of soil to water is 1:1; the surfactant is sodium dodecylbenzene sulfonate, and the addition amount is 1% of the added mass of persulfate, and the persulfate is It is a mixture of sodium persulfate, potassium persulfate and potassium persulfate in a molar ratio of 6:5:2, wherein the addition of sodium persulfate is 1.2 mol / kg; the activator is citric acid, and the addition of citric acid and persulfuric acid are The molar ratio of the amount of salt added is 1:52; the above agents are added at the same time and then stirred for 2 hours, and the stirring speed is 30 rmp; after standing for 22 hours, the soil and water are separated by vacuum filtr...

Embodiment 3

[0034] Anthracene 80.7mg / kg, pyrene 185.1mg / kg, benzopyrene 126.3mg / kg, that is, the polluted soil with polycyclic aromatic hydrocarbon content of 392.1mg / kg, was placed in the reactor, and water was added at room temperature for stirring. The weight ratio is 1:1; the surfactant cyclodextrin is added to the reactor, and the amount of the surfactant is 2% of the added mass of the persulfate. After adding, the mixture is stirred for 2 hours, and the stirring speed is 30 rmp; after 2 hours, the persulfuric acid is added Salt (sodium persulfate) and activator hydrogen peroxide, the molar ratio of sodium persulfate and activator hydrogen peroxide addition is 1:1, and the addition amount of sodium persulfate is 1.0mol / kg; after stirring reaction for 2h, soil and water Vacuum filtration separation, freeze-drying, and detection of the content of remaining PAHs in the soil after remediation. The calculated removal rate of anthracene is 94.6%, pyrene removal rate is 93.8%, benzopyrene is...

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Abstract

The invention relates to a method for combined restoration of organic-contaminated soil, comprising the following steps: (1) adding an aqueous solution of a surfactant to the organic-contaminated soil for solubilization treatment; (2) adding persulfate and an activator, Reaction, after the reaction is completed, separate and dry to obtain the repaired organic matter-contaminated soil. Compared with the prior art, the invention has the advantages of high removal rate of adsorbed organic pollutants, low cost, simple and easy method, and environmental friendliness.

Description

technical field [0001] The invention relates to the field of organic-contaminated soil remediation, in particular to a method for joint remediation of organic-contaminated soil. Background technique [0002] According to the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in April 2014, the soil pollution in some parts of the country is serious, and the total point exceeding rate is 16.1%. Second only to inorganic types, it poses a serious threat to the quality and safety of agricultural products and human health. Organic pollutants have been listed as potentially dangerous toxic pollutants in the environment and should be prioritized for control due to their complex composition and harmfulness. Therefore, the research on remediation technology for organic-contaminated sites has become a new hot and difficult point in current environmental protection engineering and technology resear...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 李森张宏玲张杨葛伟林周玉强商照聪罗勇吴向阳
Owner SHANGHAI RES INST OF CHEM IND
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