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Updated: Feb 22, 2026
Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
Published on: July 13, 2012
Effect of agitation time on nutrient distribution in full-scale CSTR biogas digesters
Philipp Kress1, Hans-Joachim Nägele1, Hans Oechsner1
1University of Hohenheim, State Institute of Agricultural Engineering and Bioenergy, Garbenstraße 9, Stuttgart 70599, Germany.
Abstract:
The aim of this work was to study the impact of reduced mixing time in a full-scale CSTR biogas reactor from 10 to 5 and to 2min in half an hour on the distribution of DM, acetic acid and FOS/TAC as a measure to cut electricity consumption. The parameters in the digestate were unevenly distributed with the highest concentration measured at the point of feeding. By reducing mixing time, the FOS/TAC value increases by 16.6%. A reduced mixing time of 2min lead to an accumulation of 15% biogas in the digestate.
