Congratulations to Dr. Bettina Huber for successfully defending her doctoral dissertation on Sept. 13, 2016 entitled "Biogenic Sulfuric Acid Corrosion in Sludge Digesters - Characterization of the bacterial groups and the corrosion potential”. The PhD committee was comprised of Prof. Hilde Lemmer, Prof. Rudi Vogel and Prof. Jörg Drewes. Prof. Christoph Gehlen served as chair of the examination board.