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Article dans une revue

Relationship Between Sulphate Starvation and Chromate Reduction in a H2-fed Fixed-film Bioreactor

Abstract : While developing a low-sulphate system combining indirect chromate-reduction by biologically-produced hydrogen sulphide and direct biological chromate-reduction to treat chromate-bearing waters, the aim of the present work was to evaluate the influence of sulphate and H2 starvation on chromate reduction. Chromate-reduction was performed under continuous-feed conditions in a fixed-film column bioreactor originally inoculated with a bacterial consortium containing Desulfomicrobium norvegicum, and fed with H2. With 500 mg l−1 of sulphate in the feed solution, total chromate-reduction was observed in the effluent whereas sulphate-reduction was strongly decreased, as also confirmed by measurements of isotopic ratios for sulphur. In the absence of sulphate, a chromate-reduction activity was still observed but was lower than in the presence of sulphate, and chromate-reduction was H2-dependent. Molecular biology techniques revealed the composition of the bacterial population in the effluent. D. norvegicum together with other micro-organisms of the Bacteria domain were detected. They include members related to the genera Acinetobacter, Acetobacterium and Rhodocyclus. Even when sulphate-reduction was strongly decreased, the presence of sulphate enhances the efficiency of the H2-dependent chromate-reduction. A H2- and CO2-consuming bacterial population may be used in a globally autotrophic process to reduce chromate at low sulphate concentration, thus avoiding excess sulphide production.
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https://hal-brgm.archives-ouvertes.fr/hal-03644830
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Soumis le : mardi 19 avril 2022 - 14:24:13
Dernière modification le : mercredi 20 avril 2022 - 03:42:21

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Fabienne Battaglia-Brunet, Caroline Michel, Catherine Joulian, Bernard Ollivier, Ioannis Ignatiadis. Relationship Between Sulphate Starvation and Chromate Reduction in a H2-fed Fixed-film Bioreactor. Water, Air, and Soil Pollution, Springer Verlag, 2007, 183 (1-4), pp.341-353. ⟨10.1007/s11270-007-9383-3⟩. ⟨hal-03644830⟩

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