Abstract
The reduction of Tc(VII), Cr(VI) Se(IV) and Te(IV) by representatives of three genera of sulphate-reducing bacteria was studied with respect to the specificity of electron donor and acceptor. Tc(VII) and Cr(VI) were reduced by different mechanisms involving a hydrogenase. Cr(VI) reduction was achieved using a new isolate with lactate as the electron donor or by using H-2 in the presence of bicarbonate ion. Te(IV) and Se(IV) were reduced to base metals. The removal of Se(TV) was enhanced under sulphidogenic conditions, with metal sulphide identified by energy dispersive X-ray microanalysis. The order of preference of the electron accepters was Te(IV) > S(VI) > Se(IV), which is in sharp contrast to that predicted by the redox potentials alone. (C) 2001 Elsevier Science B.V. All rights reserved.
Original language | English |
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Pages (from-to) | 327-337 |
Number of pages | 11 |
Journal | Hydrometallurgy |
Volume | 59 |
Issue number | 2-3 |
DOIs | |
Publication status | Published - 1 Feb 2001 |
Keywords
- bioreduction
- chromate
- Desulfovibrio
- tellurite
- selenite
- pertechnetate
- sulphate-reducing bacteria