Biodegradation of geosmin in drinking water by novel bacteria isolated frombiologically active carbon
Beihai Zhou , Rongfang Yuan , Chunhong Shi , Liying Yu , Junnong Gu , Chunlei Zhang
DOI:
Received May 26, 2010,Revised September 29, 2010, Accepted , Available online
Volume 23,2011,Pages 816-823
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Three strains of Gram-negative bacteria capable of removing geosmin from drinking water were isolated from biologically active
carbon and identified to be Chryseobacterium sp., Sinorhizobium sp. and Stenotrophomonas sp. based on physio-biochemistry analysis
and 16S rRNA gene sequence analysis. Removal e ciencies of 2 mg/L geosmin in mineral salts medium were 84.0%, 80.2% and
74.4% for Chryseobacterium sp., Sinorhizobium sp. and Stenotrophomonas sp., respectively, while removal e ciencies of 560 ng/L
geosmin in filter influent were 84.8%, 82.3% and 82.5%, respectively. The biodegradation of geosmin was determined to be a pseudo
first-order reaction, with rate constants at 2 mg/L and 560 ng/L being 0.097 and 0.086 day??1, 0.089 and 0.084 day??1, 0.074 and 0.098
day??1 for the above mentioned degraders, respectively. The biomass of culture in the presence of geosmin was much higher than that
in the absence of geosmin.
