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Degradation of ozonized tire rubber by aniline – Degrading Candida methanosorbosa BP6 strain

Marchut-Mikołajczyk, Olga, Drożdżyński, Piotr, Januszewicz, Bartłomiej, Domański, Jarosław, Wrześniewska-Tosik, Krystyna
Journal of hazardous materials 2019 v.367 pp. 8-14
Candida, Fourier transform infrared spectroscopy, aldehydes, aniline, biodegradation, biosurfactants, emulsifying properties, microbial growth, oxygen, ozonation, ozone, polymers, protein content, roughness, rubber, tires, yeasts
Aniline-degrading yeast strain - Candida methanosorbosa BP-6 was tested for its ability to degrade ground tire rubber, treated and non-treated with ozone. The protein content, respiratory activity, critical oxygen concentration (COC) and emulsifying activity of the yeast strain were monitored during 21 day degradation process. The effects of biodegradation were evaluated using aldehyde detection, Scanning Electrone Microscope (SEM) and Fourier-transform infrared spectroscopy (FTIR) analysis. Pre-treatment of ground tire rubber with ozone resulted in lower microbial growth. However, metabolic condition of the C. methanosorbosa BP-6 yeast strain was higher in sample with ozonized tire rubber. Furthermore, the COC values in the last days of the process were about 30% lower regarding non-ozonized polymer. Also, the ozonization of tire rubber resulted in higher biosurfactant production of the yeast strain. The roughness and visible gaps in rubber matrix (SEM analysis) confirmed the ability of Candida methanosorbosa BP-6 yeast strain for tire rubber biodegradation.