Method for removing polycyclic aromatic hydrocarbons in soil by using persulfate-calcium peroxide through compound oxidation
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A calcium peroxide, polycyclic aromatic hydrocarbon technology, applied in the field of polycyclic aromatic hydrocarbons, can solve the problems of difficult to control repair, rapid decomposition and instability, damage to soil physical and chemical properties, etc.
Active Publication Date: 2017-01-25
NANJING AGRICULTURAL UNIVERSITY
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[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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[0021] Total PAH removal rate:
[0022]
[0023] Examples 1-6, the prepared polluted farmland soil is processed using the above-mentioned polluted soil treatment method, wherein the soil-water ratio, the amount of calcium peroxide added (the amount added in the soil after air-drying per unit mass), the ferrous ion in the mud reaction solution Concentration, oxalate ion concentration and persulfate ion concentration adopt the parameters in Table 1, and the reaction time is 4 days, and then the treated soil is tested for polycyclic aromatic hydrocarbons. Wherein, the ferrous ion is added in the form of ferrous sulfate, the oxalate ion is added in the form of potassium oxalate, and the persulfate ion is added in the form of sodium persulfate.
[0024] Table 1 The effect of calcium peroxide addition on the removal rate of polycyclic aromatic hydrocarbons in soil
[0025]
[0026]
[0027] Test Results:
[0028] Table 2 The removal rate of polycyclic aromatic hydrocarbon...
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Abstract
The invention discloses a method for removing polycyclic aromatic hydrocarbons in soil by using persulfate-calcium peroxide through compound oxidation, and belongs to the field of soil repairing. The method comprises the following steps: after sieving to-be-measured air-dried soil, mixing the soil with calcium peroxide evenly; then adding distilled water to obtain slurry; successively adding oxalate ions, ferrous ions and peroxydisulfate ions, and stirring uniformly to obtain slurry reaction liquid; then leaving the slurry reaction liquid standstill in a dark place so that the polycyclic aromatic hydrocarbons in the soil can be removed after reaction is finished. By the method, naphthalene, acenaphthylene, acenaphthene, phenanthrene, anthracene, fluoranthene, pyrene, benzo[a]anthracene, a component as shown in the specification, benzo[b] fluoranthene, benzo[a]pyrene, dibenzo[a,b]anthracene, benzo[ghi] perylene and indeno[1,2,3-cd] pyrene in a complicated environment of the soil can be removed effectively, the removal rate of the polycyclic aromatic hydrocarbons is high, neutral pH of the soil can be maintained, acidized soil is improved, and a catalyst and a chelating agent are adopted, so that the removal effect and the removal efficiency are enhanced.
Description
technical field [0001] The invention relates to the technical field of soil remediation, and specifically relates to a method for removing polycyclic aromatic hydrocarbons in soil by using persulfate-calcium peroxide composite oxidation. 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 people's lack of 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) are 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, remov...
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