Reduction of pertechnetate by haloalkaliphilic strains of Halomonas

It is shown for the first time that haloalkaliphilic bacteria, isolated from soda-lake environments were capable of reducing Tc(VII)O4− to the Tc(V), Tc(IV) and Tc(III) at pH 10 in carbonate medium, whereas no reduction took place without bacteria or in the presence of dead biomass. After 34 h of in...

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Bibliographic Details
Published in:FEMS microbiology ecology 2003-05, Vol.44 (1), p.109-115
Main Authors: Khijniak, Tatiana V, Medvedeva-Lyalikova, Natalia N, Simonoff, Monique
Format: Article
Language:English
Subjects:
Bacteria
Ecology
Microbiology
Microorganisms
Reduction
Stream pollution
Technetium
Waste management
Waste streams
Water pollution
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Summary:It is shown for the first time that haloalkaliphilic bacteria, isolated from soda-lake environments were capable of reducing Tc(VII)O4− to the Tc(V), Tc(IV) and Tc(III) at pH 10 in carbonate medium, whereas no reduction took place without bacteria or in the presence of dead biomass. After 34 h of incubation, 55% remained as Tc(VII), 36% was found as Tc(IV) and 8% as Tc(V) and after 2 months 80% of the technetium was reduced. Technetium has a toxic effect on bacteria. Reduction of TcO4− was drastically decreased at concentration above 1.5 mM. The microbial reduction has been suggested as a potential mechanism for the removal of Tc from contaminated environments or waste streams.
ISSN:0168-6496
1574-6941
DOI:10.1016/S0168-64960300018-7