Econ. Environ. Geol. 2001; 34(4): 345-354

Published online August 31, 2001

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Microbial Effects on Geochemical Behavior of Arsenic under Aerobic Condition and Their Applicability to Environmental Remediation

Jong-Un Lee*, Sang-Woo Lee and Kyoung-Woong Kim

Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology, Kwangju, 500-712, Korea

Correspondence to :

Jong-Un Lee

jlee@kjist.ac.kr

Received: June 8, 2001; Accepted: August 14, 2001

Abstract

The effects on arsenic geochemistry of indigenous microorganisms isolated from an area contaminated with high concentration of arsenic were investigated. Arsenite exerted higher inhibitory effects on the microbes' growth than arsenate. During incubation of the microbes in an arsenate-spiked medium over 24 hours, decrease in microbial growth was observed as arsenate content increased. Arsenate of 150 mM or over apparently inhibited cell growth. However, further incubation for up to 4 days in the high arsenate concentration medium resulted in cell growth, implying that the microorganisms adjusted their biochemical functions to detoxify arsenic and maintain growth. Two types of microbes were observed during 20 hours to reduce arsenate to arsenite in solution through a detoxification mechanism. As well, decrease in the total arsenic content occurred over a 4-day incubation with the same microbes in an arsenate-spiked medium. Therefore it is suggested that microorganisms can influence arsenic speciation in natural settings and this may be applied to efficient bioremediation of arsenic-contaminated sites.

Keywords microorganism, arsenic, speciation, geochemistry, bioremediation

Article

Econ. Environ. Geol. 2001; 34(4): 345-354

Published online August 31, 2001

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Microbial Effects on Geochemical Behavior of Arsenic under Aerobic Condition and Their Applicability to Environmental Remediation

Jong-Un Lee*, Sang-Woo Lee and Kyoung-Woong Kim

Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology, Kwangju, 500-712, Korea

Correspondence to:

Jong-Un Lee

jlee@kjist.ac.kr

Received: June 8, 2001; Accepted: August 14, 2001

Abstract

The effects on arsenic geochemistry of indigenous microorganisms isolated from an area contaminated with high concentration of arsenic were investigated. Arsenite exerted higher inhibitory effects on the microbes' growth than arsenate. During incubation of the microbes in an arsenate-spiked medium over 24 hours, decrease in microbial growth was observed as arsenate content increased. Arsenate of 150 mM or over apparently inhibited cell growth. However, further incubation for up to 4 days in the high arsenate concentration medium resulted in cell growth, implying that the microorganisms adjusted their biochemical functions to detoxify arsenic and maintain growth. Two types of microbes were observed during 20 hours to reduce arsenate to arsenite in solution through a detoxification mechanism. As well, decrease in the total arsenic content occurred over a 4-day incubation with the same microbes in an arsenate-spiked medium. Therefore it is suggested that microorganisms can influence arsenic speciation in natural settings and this may be applied to efficient bioremediation of arsenic-contaminated sites.

Keywords microorganism, arsenic, speciation, geochemistry, bioremediation

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

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