Codigestion of proteinaceous industrial waste |
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Authors: | Braun R Brachtl E Grasmug M |
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Institution: | (1) Department of Environmental Biotechnology, Institute of Agrobiotechnology Tulln, University of Agricultural Sciences Vienna, Konrad Lorenzstrasse 20, A-3430 Tulln, Austria |
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Abstract: | Organic wastes are increasingly collected source separated, thus requiring additional treatment or recovery capacities for
municipal biowastes, organic industrial wastes, as well as agroindustrial byproducts. In this study, we demonstrate that anaerobic
digestion is preferentially suited for high-water-containing liquid or pasty waste materials. We also evaluate the suitability
of various organic wastes and byproducts as substrates for anaerobic digestion and provide a current status survey of codigestion.
Biodegradation tests and estimations of the biogas yield were carried out with semisolid and pasty proteins and lipids containing
byproducts from slaughterhouses; pharmaceutical, food, and beverage industries; distilleries; and municipal biowastes. Biogas
yields in batch tests ranged from 0.3 to 1.36 L/g of volatile solidsadded. In continuous fermentation tests, hydraulic retention times (HRTs) between 12 and 60 d, at a fermentation temperature of
35°C, were required for stable operation and maximum gas yield. Laboratory experiments were scaled up to full-scale codigestion
trials in municipal and agricultural digestion plants. Up to 30% cosubstrate addition was investigated, using municipal sewage
sludge as well as cattle manure as basic substrate. Depending on addition rate and cosubstrate composition, the digester biogas
productivity could be increased by 80–400%. About 5–15% cosubstrate addition proved to be best suited, without causing any
detrimental effects on the digestion process or on the further use of the digestate. |
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Keywords: | Anaerobic digestion codigestion biowastes industrial wastes proteinaceous wastes biogas |
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