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Updated: Jul 17, 2026

Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
Published on: July 13, 2012
A new approach to improve sludge dewatering using a semi-continuous hydraulic press system
G Kolisch1, M Boehler, F C Arancibia
1Wupperverbandsgesellschaft für integrale Wasserwirtschaft mbH, Untere Lichtenplatzer Strasse 100, 42289 Wuppertal, Germany. kol@wupperverband.de
Abstract:
In future, it will be necessary to incinerate an increasing proportion of the sludge produced by public wastewater treatment. In this context, equipment for more effective dewatering of sewage sludge is required. A hydraulic press system (Bucher HP) which has been used to date in the food industry could represent an alternative to the sludge dewatering systems currently used. The basic suitability of this press system was demonstrated in comprehensive industrial-scale trials at the Glarnerland STP (Switzerland). Dry solids contents of up to 43% were measured in the pressed sludge. Currently, the optimization of individual process parameters is being investigated in a pilot plant at the Schwelm STP operated by Wupperverband (Germany).
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