Journal of Pure and Applied MicrobiologyVol. 8 No. May 2014 Special Edition

Biodegradation of Geosmin by a Newly Isolated Xanthobacter flavus-YW

Yuanyuan Wu1,2, Chunmeng Qi3, Zhenguang Huang1, Keruo Ren1, Xueyao Yin1, Jinrui Zhao1 and Hai Yan1*

1School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing - 100083, China. 2Civil and Environment Engineering School, University of Science and Technology Beijing, Beijing - 100083, China. 3College of Food Science and Nutritional Engineering, China Agricultural University, Beijing - 100083, China.

Received on 12 April 2014 and accepted on 09 May 2014



Geosmin is a typical odorant in potable water sources, but this substance is hardly removed by conventional water treatment. In this study, a promising facultative anaerobic bacterial strain was successfully isolated from a bioreactor and exhibited a high biodegradation rate of geosmin. 16S rRNA sequencing and physiological analysis were performed. Results showed that this strain belongs to Gram-negative Xanthobacter flavus. To date, this is the only study to report the isolation and characterization of a facultative anaerobic bacterium from a bioreactor capable of biodegrading geosmin as the sole carbon source. As additional carbon source of X. flavus-YW, beef extract (0.5?g/L) may enhance the biodegradation of geosmin. At an initial concentration of 50 ?g/L, 60% of geosmin was biodegraded after 2?d, and 71.3% of geosmin was biodegraded after 10?d. This study is important in basic research and application of the efficient removal of geosmin from potable water sources.

Keywords : Geosmin; Biodegradation; Isolation; Xanthobacter spp.