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Method for remedying polycyclic aromatic hydrocarbon contaminated soil

A technology for contaminated soil and polycyclic aromatic hydrocarbons, applied in the field of contaminated soil remediation, can solve the problems of reduced oxidation efficiency and achieve the effect of increased removal rate and less dosage

Inactive Publication Date: 2018-09-25
INST OF SOIL SCI CHINESE ACAD OF SCI
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Problems solved by technology

However, during the activation of persulfate by ferrous ions, it is often accompanied by the reaction of sulfate radicals with excess ferrous ions, which eventually leads to a decrease in oxidation efficiency.

Method used

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  • Method for remedying polycyclic aromatic hydrocarbon contaminated soil

Examples

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Embodiment 1

[0015] The specific implementation steps are as follows:

[0016] (1) Collect contaminated soil from a coal-to-gas plant in Nanjing, with a sampling depth of about 1.5 m. The samples were air-dried to remove impurities, ground through a 0.2 mm sieve, mixed evenly and stored in a refrigerator at 4 °C for later use. The soil pH is 6.2, and the soil organic matter content is 19.5g·kg -1 , the soil PAHs concentration was 2632 mg / kg.

[0017] (2) Accurately weigh 1.5 g of sodium persulfate, 0.066 g of citric acid, and 0.1 g of ferrous sulfate, transfer them to a 250 mL glass conical flask, add 50 mL of deionized water and mix well, and prepare ferrous ion-activated sodium sulfate. Then accurately weigh 10 g of the PAHs-contaminated soil in step (1), add it into the activated sodium persulfate solution, put it into a magnetic stirrer, seal the bottle mouth with a parafilm, and place the Erlenmeyer flask on a magnetic stirrer to start Oxidation reaction, pay attention to adjust t...

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Abstract

The invention discloses a method for remedying polycyclic aromatic hydrocarbon contaminated soil. The method has the advantages that the polycyclic aromatic hydrocarbon contaminated soil can be remedied by the aid of ferrous ions and sodium persulfate systems, and the ferrous ions are added into the polycyclic aromatic hydrocarbon contaminated soil in batches; ferrous ion adding modes are changed,inhibiting reaction between excessive ferrous ions and sulfate free radicals can be prevented by low-dose batch adding modes, competing reaction between SO4.-, organic matters and inorganic anions can be prevented, accordingly, the removal rate of active sodium persulfate for removing PAHs (polycyclic aromatic hydrocarbons) in soil by means of oxidation can be increased, the addition dose of theferrous ions can be reduced, a low-consumption, efficient and environment-friendly treatment technology can be provided, and the method has important significance in PAHs contaminated soil treatment and remediation.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a method for remediating polycyclic aromatic hydrocarbon contaminated soil by adding ferrous ion sodium persulfate oxidant in batches in small doses. Background technique [0002] Polycyclic aromatic hydrocarbons (polycyclic aromatic hydrocarbons, PAHs) are a class of organic pollutants that widely exist in the environment, and are also the earliest chemical carcinogens discovered and studied, with long-term persistence, bioaccumulation, and "three-cause" effects. In 1979, there were 16 PAHs among the 129 priority monitoring pollutants announced by the US Environmental Protection Agency; the Chinese government also included 7 PAHs in the list of China's environmental priority pollutants. PAHs in the environment mainly come from coking gas, petrochemical and organic chemical industries. In the process of urbanization, a large number of polluting enterprise...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 申洋洋宋静
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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