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Micro-wave heating desorption/alkyl catalytic decomposition treatment method for polychlorinated biphenyl in soil

A technology for polychlorinated biphenyls and decomposition treatment, which is applied in the restoration of polluted soil and other directions, can solve the problems of slow desorption rate and low treatment capacity, and achieve the effects of reducing treatment cost, saving energy and improving treatment efficiency.

Inactive Publication Date: 2006-10-25
TSINGHUA UNIV
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Problems solved by technology

[0009] The purpose of the present invention is to provide a microwave thermal method for polychlorinated biphenyls in soil for the existing BCD process for processing persistent organic pollutants such as PCBs in soil. Desorption / alkali-catalyzed decomposition treatment method

Method used

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Embodiment

[0039] Microwave thermal desorption / alkali catalytic decomposition treatment of simulated PCBs polluted soil

[0040] Since trichlorobiphenyl used as an impregnating agent for power capacitors has been mass-produced in my country, commercially available 2,4,5-trichlorobiphenyl (PCB29) was selected as a model compound. Prepare the stock solution of PCB29 with n-hexane, add it to a certain amount of soil not polluted by PCBs, stir and mix thoroughly, evaporate the solvent in a fume hood, and obtain the soil with a concentration of PCB29 of 100mg / kg, and keep it in a closed container to avoid Light preservation, aging for one month for future use. Require PCB29 concentration to be lower than 1mg / kg in the treated soil, adopt microwave thermal desorption / alkali catalytic decomposition device among the present invention, carry out the processing of simulated PCBs contaminated soil, the steps are:

[0041] The first step is to adjust the humidity, and the soil humidity is adjusted ...

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Abstract

The present invention relates to a method for treating polychlorobiphenyls (PCBs) in polluted soil. It is characterized by that it uses wirowave as heat source to heat the soil polluted by PCBs in container, utilizes the lots of aqueous vapour produced by action of microwave and water in soil to carry off the PCBs molecules from soil, namely microwave thermal desorption process, to implement separation of PCBs and soil, then the volatilized pollutant can be trapped, and treated by alkali-catalyzed decomposition process.

Description

field of invention [0001] The invention belongs to the technical field of organic pollutant treatment in soil for environmental protection. Involves the combined process of microwave thermal desorption and alkali-catalyzed decomposition to treat persistent organic pollutants in contaminated soil, especially polychlorinated biphenyls (PCBs) leaked into the soil from discarded electrical equipment. Background of the invention [0002] PCBs are a class of organic pollutants with stable properties and acute and chronic toxicity, which have been widely used in many industries. PCBs can enter the soil through various channels during use, causing soil pollution. The distribution of PCBs in the soil exceeds 99% of the total amount of PCBs entering the environment. The content of PCBs in the soil of industrially polluted areas can be as high as more than a dozen mg / kg, and even as high as 510mg / kg in the soil near factories producing electrical components in Japan. . PCBs has a pr...

Claims

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Application Information

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IPC IPC(8): B09C1/06A62D3/00
Inventor 余刚刘希涛黄俊
Owner TSINGHUA UNIV
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