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Updated: Jul 10, 2026

Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
Published on: July 13, 2012
Stabilization of swine wastes by anaerobic digestion
R D Costa1, C R G Tavares, E S Cossich
1Department of Chemical Engineering, State University of Maringá, Av. Colombo, 5790, Bloco E46-09, 87020-900, Maringá--PR, Brazil.
Abstract:
The purpose of this study was to evaluate the efficiency of the anaerobic digestion to reduce the organic load of swine waste. Anaerobic digestion is a biological means of decomposition of manure in an oxygen-free environment, and has the advantage of producing a fuel gas (methane) and an odor-free residue rich in nutrients, which can be used as fertilizer. The experiments were carried out in laboratory scale batch digester, at temperature controlled at 35 +/- 2 degrees C, without agitation. The digester was fed with 5% and 15% manure slurry. Results showed an average reduction of TCOD of 58% and DCOD of 85%. The methane content of biogas varied from 55 to 65% and stabilized sludge presented characteristics for use in agriculture.
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