A Strain Rhodococcus wratislaviensis КТ112-7 as a Basis for Bioregeneration of PCB-Contaminated Metal/Carbon Catalyst

Abstract

A possibility of the bioregeneration of polychlorinated biphenyl-contaminated metal/carbon catalysts using aerobic bacteria as biological agents has been shown. Using the 5%-Pd/Sibunit catalyst contaminated by the products of the hydrodechlorinaton of the PCB commercial mixture of the Sovol brand and a strain of Rhodococcus wratislaviensis КТ112-7 it was proved that the application of the bacterial culture permits to rapidly clean the catalyst with the minimal technical and economic costs. It was established that the degree of the catalyst decontamination for 24 h with the help of the intact bacteria cells was equal to 99% (0.77 mg/mL). According to the gas-liquid chromatography, the R. wratislaviensis КТ112-7 strain decomposed all the components occurring on 5%-Pd/Sibunit after the reaction of PCB hydrodechlorination. The efficiency of the bacterial destruction made up 97% (0.76 mg/mL). The residual portion of contaminating compounds was adsorbed by the bacterial cells. Therefore, the R. wratislaviensis КТ112-7 strain can be used as a biological component in the systems for PCB-contaminated metal/carbon catalyst cleaning.