Enhancement of Fe(III), Co(III), and Cr(VI) reduction at elevated temperatures and by a thermophilic bacterium

An unusual thermophilic bacterium has been isolated from deep subsurface sediments and tested for its ability to enhance Fe(III), Co(III), and Cr(VI) reduction. Without the bacterium, abiotic metal reduction was insignificant at temperatures below 45°C, but became a major process at 75°C. Addition of the bacterium enhanced the reduction of these metals up to fourfold, probably by nonspecific mechanisms. This study demonstrates abiotic and biotic metal reduction under organic-rich thermic conditions, and suggests that thermally and/or biologically enhanced metal reduction may provide an alternative for remediating metal contamination.

[1]  K. Nealson,et al.  Bacterial Manganese Reduction and Growth with Manganese Oxide as the Sole Electron Acceptor , 1988, Science.

[2]  Elizabeth A. Burton,et al.  Chemical and microbial processes causing anomalous magnetization in environments affected by hydrocarbon seepage , 1991 .

[3]  C. Palmer,et al.  Processes affecting the remediation of chromium-contaminated sites. , 1991, Environmental health perspectives.

[4]  J. Jones,et al.  Bacterial Reduction of Ferric Iron in a Stratified Eutrophic Lake , 1983 .

[5]  O. Levenspiel.  Chemical Reaction Engineering , 1972 .

[6]  Derek R. Lovley,et al.  Reduction of Chromate by Desulfovibrio vulgaris and Its c3 Cytochrome , 1994, Applied and environmental microbiology.

[7]  D. Lovley,et al.  Dissimilatory metal reduction. , 1993, Annual review of microbiology.

[8]  K. Nealson,et al.  Dissolution and reduction of magnetite by bacteria. , 1995, Environmental science & technology.

[9]  Lovley DerekR..  Organic matter mineralization with the reduction of ferric iron: A review , 1987 .

[10]  T. Phelps,et al.  Microbial activities in deep subsurface environments , 1989 .

[11]  W. J. Hickey,et al.  Degradation of Atrazine by Fenton's Reagent: Condition Optimization and Product Quantification. , 1995, Environmental science & technology.

[12]  K. Nealson,et al.  Iron and manganese in anaerobic respiration: environmental significance, physiology, and regulation. , 1994, Annual review of microbiology.

[13]  P. Urone.  Stability of Colorimetric Reagent for Chromium, s-Diphenylcarbazide, in Various Solvents , 1955 .

[14]  D. Lovley,et al.  Novel Mode of Microbial Energy Metabolism: Organic Carbon Oxidation Coupled to Dissimilatory Reduction of Iron or Manganese , 1988, Applied and environmental microbiology.

[15]  Derek R. Lovley,et al.  Enzymatic versus nonenzymatic mechanisms for Fe(III) reduction in aquatic sediments , 1991 .

[16]  M. Hoffmann,et al.  Inhibitor studies of dissimilative Fe(III) reduction by Pseudomonas sp. strain 200 ("Pseudomonas ferrireductans") , 1986, Applied and environmental microbiology.

[17]  M. Elovitz,et al.  Redox Interactions of Cr(VI) and Substituted Phenols: Kinetic Investigation. , 1994, Environmental science & technology.

[18]  H. Aldrich,et al.  Bacillus infernus sp. nov., an Fe(III)- and Mn(IV)-reducing anaerobe from the deep terrestrial subsurface. , 1995, International journal of systematic bacteriology.

[19]  L. Stookey.  Ferrozine---a new spectrophotometric reagent for iron , 1970 .