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253 22 22 5 5 F. X. Wildenauer J. Winter Department of Microbiology University of Regensburg Universitätsstr. 31 D-8400 Regensburg Germany Summary A fixed film loop reactor was developed for the stabilization of undiluted sour whey. Porous clay beads were used to immobilize the population. The fermentation system was self-supporting with the aid of a pH-titrator. Within 2 months; the loading increased automatically to its maximum of 14 kg COD (chemical oxygen demand)/m 3 per day. Parallel to this, the bacterial film was formed on the surface of the support material. For a pH of 6.7 the steady state was reached at a hydraulic retention time of 5 days equivalent to a loading of 14 kg COD/m 3 per day. An amount of 5.6 m 3 biogas was produced per m 3 digester content and day and the COD-reduction was 95%. The pH-controlled whey addition led to only minor disturbances when overloading or oxygenation occured and a fast recovery of methanogenesis was observed. The economics of anaerobic whey digestion compared with conventional whey utilization is estimated by a simple cost/benefit calculation.
Applied Microbiology and Biotechnology – Springer Journals
Published: Sep 1, 1985
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