Econ. Environ. Geol. 2003; 36(5): 349-356

Published online October 31, 2003

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Preliminary Study on Arsenic Speciation Changes Induced by Biodegradation of Organic Pollutants in the Soil Contaminated with Mixed Wastes

Sanghoon Lee*, Challan Chun and Jiae Shim

Environmental Engineering, Division of Biotechnology, The Catholic University of Korea, Buchon 420-743, Korea

Correspondence to :

Sanghoon Lee

slee@catholic.ac.kr

Received: February 18, 2003; Accepted: September 15, 2003

Abstract

As industrial activities are growing, pollutants found in the contaminated land are getting diverse. Some contaminated areas are subject to mixed wastes containing both organic and inorganic wastes such as hydrocarbon and heavy metals. This study concerns with the influence of the degradation of organic pollutants on the coexisting heavy metals, expecially for As. As mainly exists as two different oxidation state; As(III) and As(V) and the conversion between the two chemical forms may be induced by organic degradation in the soil contaminated by mixed wastes. We operated microcosm in an anaerobic chamber for 60 days, using sandy loam. The soils in the microcosm are artificially contaminated both by tetradecane and As, with different combination of As(III) and As(V);As(III):As(V) 1:1, As(III) only and As(V) only. Although not systematic, ratio of As(III)/As(Total) increase slightly at the later stage of experiment. Considering complicated geochemical reactions involving oxidation/reduction of organic materials, Mn/Fe oxides and As, the findings in the study seem to indicate the degradation of the organics is connected with the As speciation. That is to say, the As(V) can be reduced to As(III) either by direct or indirect influence induced by the organic degradation. Although Fe and Mn are good oxidising agent for the oxidation of As(III) to As(V), organic degradation may have suppressed reductive dissolution of the Fe and Mn oxides, causing the organic pollutants to retard the oxidation of As(III) to As(V) until the organic degradation ceases. The possible influence of organic degradation on the As speciation implies that the As in mixed wastes may be have elevated toxicity and mobility by partial conversion from As(V) to As(III).

Keywords arsenic speciation, bioremediation, mixed wastes, anaerobic condition, redox changes

Article

Econ. Environ. Geol. 2003; 36(5): 349-356

Published online October 31, 2003

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Preliminary Study on Arsenic Speciation Changes Induced by Biodegradation of Organic Pollutants in the Soil Contaminated with Mixed Wastes

Sanghoon Lee*, Challan Chun and Jiae Shim

Environmental Engineering, Division of Biotechnology, The Catholic University of Korea, Buchon 420-743, Korea

Correspondence to:

Sanghoon Lee

slee@catholic.ac.kr

Received: February 18, 2003; Accepted: September 15, 2003

Abstract

As industrial activities are growing, pollutants found in the contaminated land are getting diverse. Some contaminated areas are subject to mixed wastes containing both organic and inorganic wastes such as hydrocarbon and heavy metals. This study concerns with the influence of the degradation of organic pollutants on the coexisting heavy metals, expecially for As. As mainly exists as two different oxidation state; As(III) and As(V) and the conversion between the two chemical forms may be induced by organic degradation in the soil contaminated by mixed wastes. We operated microcosm in an anaerobic chamber for 60 days, using sandy loam. The soils in the microcosm are artificially contaminated both by tetradecane and As, with different combination of As(III) and As(V);As(III):As(V) 1:1, As(III) only and As(V) only. Although not systematic, ratio of As(III)/As(Total) increase slightly at the later stage of experiment. Considering complicated geochemical reactions involving oxidation/reduction of organic materials, Mn/Fe oxides and As, the findings in the study seem to indicate the degradation of the organics is connected with the As speciation. That is to say, the As(V) can be reduced to As(III) either by direct or indirect influence induced by the organic degradation. Although Fe and Mn are good oxidising agent for the oxidation of As(III) to As(V), organic degradation may have suppressed reductive dissolution of the Fe and Mn oxides, causing the organic pollutants to retard the oxidation of As(III) to As(V) until the organic degradation ceases. The possible influence of organic degradation on the As speciation implies that the As in mixed wastes may be have elevated toxicity and mobility by partial conversion from As(V) to As(III).

Keywords arsenic speciation, bioremediation, mixed wastes, anaerobic condition, redox changes

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

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