The anaerobic microbial conversion of organic matter into biogas is state of the art. Organically high loaded wastewater is treated preferably by anaerobic digestion (AD), e.g. wastes and wastewater of the food industry. Breweries generate not only above-average amounts of wastewater and organic wastes but also a very inhomogeneous wastewater. Treating a brewery's wastewater presumes knowledge of its origin and composition to optimise the digestion process. Principles of anaerobic biological wastewater treatment are illustrated as well as typical factors for operating a biogas plant in breweries. These factors can be influenced only in a certain range. In general the implementation of AD plants in breweries shall be accompanied by restructuring the energy and wastewater management. Especially the utilisation of biogas respectively surplus heat asks for an intensive consideration of the production process. In Germany changing legislative restrictions and acts on granting priority to renewable energy sources offer thought-provoking impulses.
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