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Sulfobacillus  and  Leptospirillum  occur frequently in leaching systems. Here we investigated the effects of cells of  L. ferriphilum  on biofilm formation and leaching performance by  S. thermosulfidooxidans . The effects were caused by the presence of  L. ferriphilum  or an addition of pyrite leach liquor from  L. ferriphilum . Data show that the number of attached  S. thermosulfidooxidans  on pyrite increases, if the pyrite had been pre-colonized by living biofilms of  L. ferriphilum , while it decreases if the pre-colonized biofilms had been inactivated. Coaggregation between  S. thermosulfidooxidans  and  L. ferriphilum  occurs during the dual-species biofilm formation, but different effects on bioleaching were noted, if the preculture of  L. ferriphilum  had been different. If  L. ferriphilum  had been pre-colonized on a pyrite, significantly negative effect was shown. However, if the two species were simultaneously inoculated into a sterile leaching system, the bioleaching efficiency was better than that of a pure culture of  S. thermosulfidooxidans . The effect might be related to a metabolic preference of  S. thermosulfidooxidans . If  S. thermosulfidooxidans  performed leaching in a filtered pyrite leachate from  L. ferriphilum , the cells preferred to oxidize RISCs instead of ferrous ion and the number of attached cells decreased compared with the control. This study gives an indication that in a short-term multi-species leaching system the role of  S. thermosufidooxidans  may be related to the time of its introduction.

Interactions Between Cells of Sulfobacillus thermosulfidooxidans and Leptospirillum ferriphilum During Pyrite Bioleaching