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A team from the University of Jaén has discovered a bacterium, Klebsiella 3S1, which is able to remove lead, zinc and silver from wastewater. The group has created a biofilter made from these microorganisms that can retain those materials which become contaminating and harmful, especially to animals and, by extension, to humans. In addition, the process recovers metal nanoparticles, in particular silver, that can be used in biomedicine and nanotechnology.