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

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...