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Scanning electron microscopy of biofilm development in anaerobic fixed-bed reactors: Influence of the inoculum
Authors:Gerhard Zellner  Hans Diekmann  Ute Austermann-Haun  Carl Franz Seyfried
Institution:(1) Institut für Mikrobiologie, Universität Hannover, Schneiderberg 50, D-30167 Hannover, Germany;(2) Institut für Siedlungswasserwirtschaft und Abfalltechnik, Universität Hannover, Weifengarten 1, D-30167 Hannover, Germany
Abstract:Summary Scanning electron microscopy was applied to evaluate the influence of inoculum on efficiency of initial biofilm formation and reactor performance. Five anaerobic fixed-bed reactors were inoculated with anaerobic sludges from different sources and operated in parallel under identical conditions with defined wastewater and acetate, propionate and butyrate as constituents In all sludges Methanothrix sp. was the predominant acetotroph. The reactors inoculated with anaerobic sludge adapted to the wastewater achieved the highest space loading with 21.0 g COD/l·d after 58 days. The inoculation with granular sludge from an upflow anaerobic sludge blanket (UASB) reactor resulted in significantly less reactor efficiency. Time course of biofilm formation and biofilm thickness (ranging from 20–200 mgrm) depended on the type of inoculum.
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