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 s...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.展开更多
One of the most common taste and odour compounds （TOCs） in drinking water is 2-methylisobor- neol （2-MIB） which cannot be readily removed by conventional water treatments. Four bacterial strains for degrading 2-MI...One of the most common taste and odour compounds （TOCs） in drinking water is 2-methylisobor- neol （2-MIB） which cannot be readily removed by conventional water treatments. Four bacterial strains for degrading 2-MIB were isolated from the surface of a biological activated carbon filter, and were characterized as Micrococcus spp., Flavobacterium spp., Brevibacterium spp. and Pseudomonas spp. based on 16S rRNA analysis. The removal efficiencies of 2-MIB with initial concentra- tions of 515 ng.L i were 98.4%, 96.3%, 95.0%, and 92.8% for Micrococcus spp., Flavobacterium spp., Brevibacter- ium spp. and Pseudomonas spp., respectively. These removal efficiencies were slightly higher than those with initial concentration at 4.2 mg. L~ （86.1%, 84.4%, 86.7% and 86.0%, respectively）. The kinetic model showed that biodegradation of 2-MIB at an initial dose of 4.2 mg. L1 was a pseudo-first-order reaction, with rate constants of 0.287, 0.277, 0.281, and 0.294d-1, respectively. These degraders decomposed 2-MIB to form 2-methylenebor- nane and 2-methyl-2-bornane as the products.展开更多
基金supported by the National Science and Technology Major Projects Special for Water Pollution Control and Management (No. 2009ZX07424-003)
文摘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.
文摘One of the most common taste and odour compounds （TOCs） in drinking water is 2-methylisobor- neol （2-MIB） which cannot be readily removed by conventional water treatments. Four bacterial strains for degrading 2-MIB were isolated from the surface of a biological activated carbon filter, and were characterized as Micrococcus spp., Flavobacterium spp., Brevibacterium spp. and Pseudomonas spp. based on 16S rRNA analysis. The removal efficiencies of 2-MIB with initial concentra- tions of 515 ng.L i were 98.4%, 96.3%, 95.0%, and 92.8% for Micrococcus spp., Flavobacterium spp., Brevibacter- ium spp. and Pseudomonas spp., respectively. These removal efficiencies were slightly higher than those with initial concentration at 4.2 mg. L~ （86.1%, 84.4%, 86.7% and 86.0%, respectively）. The kinetic model showed that biodegradation of 2-MIB at an initial dose of 4.2 mg. L1 was a pseudo-first-order reaction, with rate constants of 0.287, 0.277, 0.281, and 0.294d-1, respectively. These degraders decomposed 2-MIB to form 2-methylenebor- nane and 2-methyl-2-bornane as the products.
