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Method for removing polycyclic aromatic hydrocarbon methylnaphthalene substance by adopting double oxidants including persulfate and calcium peroxide

A double oxidant and persulfate technology, applied in chemical instruments and methods, water treatment of special compounds, oxidized water/sewage treatment, etc., can solve the problems of large influence of microorganisms, short effective time of in-situ chemical oxidants, instability, etc. , to achieve the effect of expanding the degradation range, improving the efficiency of bioremediation, and facilitating transportation

Active Publication Date: 2015-03-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims at the technical problems that the currently commonly used in-situ chemical oxidants have short effective action time, are unstable under the pH conditions of the actual groundwater or soil, and have a great influence on microorganisms in the environmental medium in engineering applications, thereby providing a method using persulfate And calcium peroxide double oxidant removes the method for organic pollutant in water body

Method used

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  • Method for removing polycyclic aromatic hydrocarbon methylnaphthalene substance by adopting double oxidants including persulfate and calcium peroxide
  • Method for removing polycyclic aromatic hydrocarbon methylnaphthalene substance by adopting double oxidants including persulfate and calcium peroxide
  • Method for removing polycyclic aromatic hydrocarbon methylnaphthalene substance by adopting double oxidants including persulfate and calcium peroxide

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Embodiment 1

[0028] Dissolve 0.1g of calcium peroxide in a certain amount of ultrapure water, place it on a stirrer and stir evenly, add dilute nitric acid solution to adjust the pH of the system to 7, add methylnaphthalene, and add ultrapure water until the final volume of the system is 100mL. The reaction was uniformly stirred at room temperature for 96 hours, and the removal of methylnaphthalene, a polycyclic aromatic hydrocarbon, was completed by using calcium peroxide alone. The removal rate of methylnaphthalene 96h reaches 34% in the present embodiment.

Embodiment 2

[0030] Dissolve 0.1g of calcium peroxide and 0.01g, 0.05g, 0.1g, 0.2g and 0.4g of sodium persulfate in a certain amount of ultrapure water respectively, place them on a stirrer and stir evenly, add dilute nitric acid solution to adjust the system respectively When the pH reached 7, methylnaphthalene was added, and ultrapure water was added until the final volume of the system was 100 mL. The reaction was uniformly stirred at room temperature for 96 hours, and the method for removing polycyclic aromatic hydrocarbons methylnaphthalene by using persulfate-calcium peroxide double oxidant was completed. The removal rates of methylnaphthalene in this example were 77% (96h), 100% (96h), 100% (72h), 100% (72h) and 100% (48h).

Embodiment 3

[0032] Dissolve 0.1g of sodium persulfate in a certain amount of ultrapure water, place it on a stirrer and stir evenly, add dilute NaOH solution to adjust the pH of the system to 7, add methylnaphthalene, and add ultrapure water until the final volume of the system is 100mL. The reaction was uniformly stirred at room temperature for 96 hours, and the removal of methylnaphthalene, a polycyclic aromatic hydrocarbon, was completed by using persulfate alone. The removal rate of methylnaphthalene 96h reaches 95% in the present embodiment.

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Abstract

The invention relates to a method for removing a polycyclic aromatic hydrocarbon methylnaphthalene substance by adopting double oxidants including persulfate and calcium peroxide. The method comprises the steps of adding persulfate and calcium peroxide into a water body containing methylnaphthalene, stirring uniformly, and reacting for 4-5 days under the condition that the pH of the system is neutral and weakly acidic, thus removing the pollutant by oxidization. The double oxidants are added into the water, and free hydroxy and sulfate radicals are generated to attack the pollutant, so that the pollutant is effectively degraded. The double oxidants including persulfate and calcium peroxide can simultaneously generate free hydroxy and sulfate radicals with extremely strong oxidation, so that the acting pollutant range is wider than that of a traditional method, and the pollutant sensitive to the free hydroxy and sulfate radicals can be simultaneously removed. The acting time is long, the applicable pH range is wide, a promotion effect on microbes in the environment is achieved, the bioremediation efficiency of microbes in environmental media can be improved, and then the repair efficiency of a polluted area is improved. The method is applicable in the field of polluted underground water repair.

Description

technical field [0001] The invention relates to a method for removing organic pollutants in water bodies, in particular to a method for removing methylnaphthalene, a polycyclic aromatic hydrocarbon, by using persulfate-calcium peroxide double oxidant in the field of groundwater restoration. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) usually refer to the general term of various organic compounds derived from two or more benzene rings [1] . High concentrations of PAHs are often seen in oil-contaminated areas. Due to its potential carcinogenicity, teratogenicity, and mutagenicity, it can be passed on through bioaccumulation and food chains, threatening human health and causing great harm to natural organisms and the ecological environment. Common repair methods for PAHs mainly include bioremediation, phytoremediation, chemical repair, etc. Compared with other repair methods, chemical oxidation has a shorter treatment cycle, lower cost, less damage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/32
CPCC02F1/72C02F1/722C02F2101/32C02F2103/06C02F2209/06C02F2305/023
Inventor 周雪飞张亚雷钱雅洁钱冬旭张静陈家斌
Owner TONGJI UNIV
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