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《Journal of Safety and Environment》 2012-03
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Isolation and biosorption performance of copper-resistant bacteria

YAN Ping1,XIE Yi-fei2(1College of Chemistry and Environmental protection Engineering,Southwest University for Nationalities,Chengdu 610041,China;2 Chengdu Institute of Biology,The Chinese Academy of Sciences,Chengdu 610041,China)  
The paper is aimed at analyzing the isolation and biosorption behavior of copper-resistant bacteria accumulated in the aquatic ecosystem,which would be likely to bring about direct or indirect threat to human health.Particularly speaking,our discussion would be focused on the copper absorption capacity of the three bacteria strains we have isolated from the activated sludge in a sewage treatment plant via concentration gradient screening.When proceeding with our research,we have investigated the effects of pH value,temperature and concentration of Cu2+ of the three strains on the adsorption behavior of Cu2+.As the result of our investigations and experiments,we have gained the following characteristic features of the strain: Z-1-4 indicates highest adsorptive efficiency of Cu2+ when its concentration reaches 140 mg/L with the pH 5.0 at 30 ℃,whereas Z-1-5 exhibits greatest adsorptive efficiency of Cu2+ on the condition that its concentration gets to 170 mg/L with the pH being 6.0 at 28 ℃.As to Z-1-6,its highest adsorptive efficiency of Cu2+ while its concentration is 140 mg/L with the pH being 6.0 at 28 ℃.All the above results prove that the optimal increasing value of pH is neutral,though the osmotic tolerance of the strain was not very strong.However,strain Z-15 tends to display its maximal biosorption efficiency among all the three strains.Its optimal growing conditions tend to be displaying at the initial concentration of 200 mg/L,with the rate of the shaker at 120 r/min,the cultured time being of 1 h,when the adsorption efficiency could reach 82.41%.The adsorption capacity would like to reach its maximum at 14.23 mg/g when the Cu2+ concentration is 170 mg/L,and the sequential analysis of 16S rDNA reveals that Z-1-5 belongs to the genus sphingomonas,whereas Strain Z-1-5 would like to reach its greatest potential for treating artificial Cu2+ in the sewage under a wide range of environmental conditions.
【CateGory Index】: X703
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