Biodegradation of geosmin in drinking water by novel bacteria isolated from biologically active carbon  

作　　者：Beihai Zhou Rongfang Yuan Chunhong Shi Liying Yu Junnong Gu Chunlei Zhang 

机构地区：[1]Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China. E-mail: zhoubeihai@ sina.com [2]Water Quality Monitoring Center, Beijing Waterworks Group, Beijing 100085, China

出　　处：《Journal of Environmental Sciences》2011年第5期816-823,共8页环境科学学报（英文版）

基　　金：supported by the National Science and Technology Major Projects Special for Water Pollution Control and Management (No. 2009ZX07424-003)

摘　　要：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 efficiencies of 2 mg/L geosmin in mineral salts medium were 84.0%, 80.2% and 74.4% for Chryxeobacterium sp., Sinorhizobium sp. and Stenotrophomonas sp., respectively, while removal efficiencies 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.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 efficiencies of 2 mg/L geosmin in mineral salts medium were 84.0%, 80.2% and 74.4% for Chryxeobacterium sp., Sinorhizobium sp. and Stenotrophomonas sp., respectively, while removal efficiencies 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.

关 键 词：GEOSMIN BIODEGRADATION pseudo first-order reaction Chryseobacterium sp. Sinorhizobium sp. Stenotrophomonas sp. 

分 类 号：X172[环境科学与工程—环境科学] TU991.2[建筑科学—市政工程]