Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Influence of Growth Rate on Biosorption of Heavy Metals by Nocardia amarae

  • Kim, Dong Wook (Department of Environmental Engineering, Cheonan National Technical College) ;
  • Daniel K. Cha (Department of Civil and Environmental Engineering, University of Delaware) ;
  • Hyung-Joon Seo (Department of Environmental Engineering, Inha University) ;
  • Jong Bok Bak (Department of Civil & Environmental Engineering, Korea University)
  • Published : 2002.12.01
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Abstract

The goal of the current research was to assess the influence of the growth rate of Nocardia amarae on its overall metal binding capacity. Batch sorption isotherms for cadmium (Cd), copper (Cu), and nickel (Ni) showed that Nocardia cells harvested from chemostat cultures at a dilution rate of $0.33d^-1$ had a significantly higher metal sorption capacity than cells grown at 0.5 and $1d^-1$. The cell surface area estimated using a dye technique indicated that pure N. amarae cells grown at a lower growth rate had a significantly more specific surface area than cells harvested from a higher growth rate operation. Accordingly, this difference in the specific surface area seemed to indicate that the higher metal sorption capacity of the slowly growing Nocardia cells was due to their higher specific surface area.

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