Econ. Environ. Geol. 2010; 43(3): 223-233

Published online June 30, 2010

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Adsorption and Redox State Alteration of Arsenic, Chromium and Uranium by Bacterial Extracellular Polymeric Substances (EPS)

Hyun-Sung Park1, Myoung-Soo Ko2 and Jong-Un Lee3*

1R&D Team, Mine Reclamation Corporation, Seoul 110-727, Korea
2Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology(GIST), Gwangju 500-712, Korea
3Department of Energy and Resources Engineering, Chonnam National University, Gwangju 500-757, Korea

Correspondence to :

Jong-Un Lee

jongun@chonnam.ac.kr

Received: May 3, 2010; Accepted: June 16, 2010

Abstract

The effects of extracellular polymeric substances (EPS) of Pseudomonas aeruginosa on adsorption and redox state alteration of dissolved As, Cr and U were investigated through batch experiments. Surfaces of bacterial cells were either vigorously washed or unwashed. Solutions of As(V), Cr(VI) and U(VI) were inoculated with the bacterial cells under no nutrient condition, and total aqueous concentrations and redox state alteration were monitored over time. No As adsorption occurred onto bacteria or EPS; however, unwashed bacteria reduced about 60% As(V) to As(III). Unwashed bacteria also led to removal of 45% total dissolved Cr and reduction of 64% Cr(VI). About
80% U(VI) was removed from solution with unwashed bacteria as well. Such electrochemical reduction of the elements was likely due to reducing capacity of EPS itself or detoxifying reduction of the bacteria which kept theirviability under protection of EPS. The results indicated that bacterial biofilm may significantly control the redox state and subsequent mobility of As, Cr and U in natural geologic settings.

Keywords bacteria, extracellular polymeric substances (EPS), arsenic, chromium, uranium

Article

Econ. Environ. Geol. 2010; 43(3): 223-233

Published online June 30, 2010

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Adsorption and Redox State Alteration of Arsenic, Chromium and Uranium by Bacterial Extracellular Polymeric Substances (EPS)

Hyun-Sung Park1, Myoung-Soo Ko2 and Jong-Un Lee3*

1R&D Team, Mine Reclamation Corporation, Seoul 110-727, Korea
2Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology(GIST), Gwangju 500-712, Korea
3Department of Energy and Resources Engineering, Chonnam National University, Gwangju 500-757, Korea

Correspondence to:

Jong-Un Lee

jongun@chonnam.ac.kr

Received: May 3, 2010; Accepted: June 16, 2010

Abstract

The effects of extracellular polymeric substances (EPS) of Pseudomonas aeruginosa on adsorption and redox state alteration of dissolved As, Cr and U were investigated through batch experiments. Surfaces of bacterial cells were either vigorously washed or unwashed. Solutions of As(V), Cr(VI) and U(VI) were inoculated with the bacterial cells under no nutrient condition, and total aqueous concentrations and redox state alteration were monitored over time. No As adsorption occurred onto bacteria or EPS; however, unwashed bacteria reduced about 60% As(V) to As(III). Unwashed bacteria also led to removal of 45% total dissolved Cr and reduction of 64% Cr(VI). About
80% U(VI) was removed from solution with unwashed bacteria as well. Such electrochemical reduction of the elements was likely due to reducing capacity of EPS itself or detoxifying reduction of the bacteria which kept theirviability under protection of EPS. The results indicated that bacterial biofilm may significantly control the redox state and subsequent mobility of As, Cr and U in natural geologic settings.

Keywords bacteria, extracellular polymeric substances (EPS), arsenic, chromium, uranium

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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