Econ. Environ. Geol. 2009; 42(5): 471-477

Published online October 31, 2009

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Removal Characteristics of Dissolved Uranium by Shewanella p. and Application to Radioactive Waste Disposal

Seung Yeop Lee1*, Min Hoon Baik1 and Jun Kyu Song2

1Division of Radwaste Technology Development, Korea Atomic Energy Research Institute
2Young Sciences Inc.

Correspondence to :

Seung Yeop Lee

seungylee@kaeri.re.kr

Received: September 21, 2009; Accepted: October 20, 2009

Abstract

An experimental removal of dissolved uranium (U) exsiting as uranyl ion (UO22+) was carried out using Shewanella p., iron-reducing bacterium. By the microbial reductive reaction, initial U concentration (50 μM) was constantly decreased, and most U were removed from solution after 2 weeks. Major mechanism that U was removed from the solution was adsorption, precipitation and mineralization on the microbe surface. Under the transmission electron microscopy, the U adsorbed on the microbe was observed as being crystallized and eventually enlarged to several μm sizes of minerals by combining with individual microbes and organic exudates. It seems that such U growth and mineralization on the microbial surface could affect the U behavior in a radioactive waste disposal site. Thus,the biogechemical reaction of metal-reducing bacteria observed in this experiment could give an affirmative measure that the microbial activity may retard U movement in subsurface environment.

Keywords uranium, Shewanella p., bacterium, mineralization, biogeochimical

Article

Econ. Environ. Geol. 2009; 42(5): 471-477

Published online October 31, 2009

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Removal Characteristics of Dissolved Uranium by Shewanella p. and Application to Radioactive Waste Disposal

Seung Yeop Lee1*, Min Hoon Baik1 and Jun Kyu Song2

1Division of Radwaste Technology Development, Korea Atomic Energy Research Institute
2Young Sciences Inc.

Correspondence to:

Seung Yeop Lee

seungylee@kaeri.re.kr

Received: September 21, 2009; Accepted: October 20, 2009

Abstract

An experimental removal of dissolved uranium (U) exsiting as uranyl ion (UO22+) was carried out using Shewanella p., iron-reducing bacterium. By the microbial reductive reaction, initial U concentration (50 μM) was constantly decreased, and most U were removed from solution after 2 weeks. Major mechanism that U was removed from the solution was adsorption, precipitation and mineralization on the microbe surface. Under the transmission electron microscopy, the U adsorbed on the microbe was observed as being crystallized and eventually enlarged to several μm sizes of minerals by combining with individual microbes and organic exudates. It seems that such U growth and mineralization on the microbial surface could affect the U behavior in a radioactive waste disposal site. Thus,the biogechemical reaction of metal-reducing bacteria observed in this experiment could give an affirmative measure that the microbial activity may retard U movement in subsurface environment.

Keywords uranium, Shewanella p., bacterium, mineralization, biogeochimical

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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