Bacterial dissimilatory MnO(2) reduction at extremely haloalkaline conditions.

A possibility of dissimilatory MnO(2) reduction at extremely high salt and pH was studied in sediments from hypersaline alkaline lakes in Kulunda Steppe (Altai, Russia). Experiments with anaerobic sediment slurries demonstrated a relatively rapid reduction of colloidal MnO(2) in the presence of acetate and formate as electron donor at in situ conditions (i.e.

Application of bacteria involved in the biological sulfur cycle for paper mill effluent purification.

In anaerobic wastewater treatment, the occurrence of biological sulfate reduction results in the formation of unwanted hydrogen sulfide, which is odorous, corrosive and toxic. In this paper, the role and application of bacteria in anaerobic and aerobic sulfur transformations are described and exemplified for the treatment of a paper mill wastewater. The sulfate containing wastewater first passes an anaerobic UASB reactor for bulk COD removal which is accompanied by the formation of biogas and hydrogen sulfide.