Method of using persulfate-calcium peroxide to remove polycyclic aromatic hydrocarbons in soil to repair soil through composite oxidation

A technology of calcium peroxide and polycyclic aromatic hydrocarbons, applied in the field of environmental treatment, can solve the problems of low utilization rate, difficult to control repair, damage to soil physical and chemical properties, etc., and achieve the effect of high removal rate

Inactive Publication Date: 2019-02-26
SHANGHAI ENERGY CONSERVATION OF ENVIRONMENT
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Problems solved by technology

[0003] At present, the common methods of oxidation, removal and restoration of soil organic pollutants are mostly Fenton or Fenton-like oxidation. Because Fenton oxidation often needs to maintain a low pH of the soil to ensure the progress of the reaction, the physical and chemical properties of the soil are seriously damaged, and Hydrogen peroxide is usually used as an oxidant, but due to its characteristics of rapid decomposition, instability, and large amount of heat release, the utilization rate is low, and it is not easy to control during repair, and a large number of problems need to be solved for large-scale use

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  • Method of using persulfate-calcium peroxide to remove polycyclic aromatic hydrocarbons in soil to repair soil through composite oxidation
  • Method of using persulfate-calcium peroxide to remove polycyclic aromatic hydrocarbons in soil to repair soil through composite oxidation

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with specific examples, but not as a limitation of the present invention.

[0016] The technical scheme of the present invention provides a method that can utilize persulfate-calcium peroxide compound oxidation to remove polycyclic aromatic hydrocarbons in soil, and the method can effectively remove polycyclic aromatic hydrocarbons (benzo(a)anthracene, benzo(b) ) fluoranthene, benzo(a)pyrene, indeno(1,2,3-cd)pyrene, dibenzo(a,h)anthracene), and the removal rate of polycyclic aromatic hydrocarbons is high, which can maintain the neutral pH of the soil; Its specific technical solutions include:

[0017] Sieve the air-dried soil to be tested and mix it with calcium peroxide. After mixing, add distilled water to make a slurry. Add oxalate ions, ferrous ions and persulfate ions to the slurry in turn, and stir evenly to obtain a slurry reaction solution. , the mud reaction solution is allowed to stand in th...

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Abstract

The invention relates to the technical field of environmental governance, and especially relates to a method of using persulfate-calcium peroxide to remove polycyclic aromatic hydrocarbons in soil torepair soil through composite oxidation. The method comprises following steps: drying soil to be tested in the air; sieving the soil; evenly mixing the soil with calcium peroxide; adding distilled water into the mixture to prepare slurry; adding oxalate ions, ferrous ions, and persulfate ions into the slurry in sequence; evenly stirring to obtain a slurry reaction solution; placing the slurry reaction solution in a dark place, and allowing the slurry reaction solution to stand still to carry out reactions. After reactions, polycyclic aromatic hydrocarbons in the soil can be removed. The provided method can effectively remove polycyclic aromatic hydrocarbons (benzanthracene (a), benzofluoranthrene (b), benzoapyrene (a), indenopyrene (1,2,3-cd), and dibenzanthracene (a,h)) in soil; the removal rate of polycyclic aromatic hydrocarbons is high, and the neutral property (pH) of the soil is maintained.

Description

technical field [0001] The invention relates to the technical field of environmental treatment, in particular to a method for persulfate-calcium peroxide composite oxidation repairing polycyclic aromatic hydrocarbons in soil. Background technique [0002] Soil is an important component of the ecosystem and the basis for human survival. However, with the development of modern industry and agriculture, and the lack of people's awareness of environmental protection, a large amount of waste gas and waste water are improperly discharged into the soil system, directly or indirectly causing soil pollution, endangering the environment and human health, polycyclic aromatic hydrocarbons (PAHs) It is a common high-risk organic pollutant in soil pollution. There are hundreds of known PAHs, among which 16 PAHs have attracted the most attention due to the "three causes" of carcinogenicity, teratogenicity and mutagenicity. [0003] At present, the common methods of oxidation, removal and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 黄玮
Owner SHANGHAI ENERGY CONSERVATION OF ENVIRONMENT
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