Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Bioremoval of Cadmium(II), Nickel(II), and Zinc(II) from Synthetic Wastewater by the Purple Nonsulfur Bacteria, Three Rhodobacter Species

  • Jin Yoo (Indoor Environment Division, Incheon Research Institute of Public Health and Environment) ;
  • Eun-Ji Oh (Water and Land Research Group/Division for Natural Environment, Korea Environment Institute) ;
  • Ji-Su Park (EHS Part, Doosan Corporation Electro-Materials) ;
  • Deok-Won Kim (Department of Earth Resources and Environmental Engineering, Hanyang University) ;
  • Jin-Hyeok Moon (Department of Environmental and Biological Chemistry, Chungbuk National University) ;
  • Deok-Hyun Kim (Chemical Accident Investigation Team, National Institute of Chemical Safety) ;
  • Daniel Obrist (Department of Environmental, Earth, and Atmospheric Sciences, University of Massachusetts Lowell) ;
  • Keun-Yook Chung (Department of Environmental and Biological Chemistry, Chungbuk National University)
  • Received : 2023.07.25
  • Accepted : 2023.10.31
  • Published : 2023.12.10
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Abstract

The purpose of this study was to determine the inhibitory effect of heavy metals [Cd(II), Ni(II), and Zn(II)] on the growth of Rhodobacter species (Rhodobacter blasticus, Rhodobacter sphaeroides, and Rhodobacter capsulatus) and their potential use for Cd(II), Ni(II), and Zn(II) bioremoval from liquid media. The presence of toxic heavy metals prolonged the lag phase in growth and reduced biomass growth for all three Rhodobacter species at concentrations of Cd, Ni, and Zn above 10 mg/L. However, all three Rhodobacter species also had a relatively high specific growth rate against each toxic heavy metal stress test for concentrations below 20 mg/L and possessed a potential bioaccumulation ability. The removal efficiency by all strains was highest for Cd(II), followed by Ni(II), and lowest for Zn(II), with the removal efficiency of Cd(II) by Rhodobacter species being 66% or more. Among the three strains, R. blasticus showed a higher removal efficiency of Cd(II) and Ni(II) than R. capsulatus and R. sphaeroides. Results also suggest that the bio-removal processes of toxic heavy metal ions by Rhodobacter species involve both bioaccumulation (intracellular uptake) and biosorption (surface binding).

Keywords

Acknowledgement

This study was conducted with the support of the Research Cooperating Program for the National Research Foundation of Korea (Project No. 2019R1F1A 106325212), NRF, Republic of Korea.

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