![]() These wastes showed better process stability when co-digested with manure than when treated alone ( Fang et al., 2011a Fang, C., Boe, K. Previous studies have shown that several industrial organic wastes could not be efficiently treated alone due to their inhibitory effect, for example, due to high salt content or ammonia. The outcomes of such co-digestion processes have not yet been foreseen and optimized. This is a new situation for biogas operation and there is urgent need for clarification of the interaction of the substrates and for establishing the best operational conditions and mixing ratios for optimal utilization of these potential biomasses. Recently, attention has been paid to co-digestion of manure with energy crops in order to boost the biogas production for reaching the goal of renewable energy contribution to the energy supply in Denmark. ![]() Moreover, co-digestion of concentrated organic substrate with manure has an advantage in the form of a synergy effect as manure is a good substrate for dilution of inhibitory wastes, rich in nutrients important for microbial growth and has strong buffer capacity for maintaining a stable pH. S., Anaerobic co-digestion of cattle manure with corn stover pretreated by sodium hydroxide for efficient biogas production. Co-digestion of manure with organic wastes has economic advantages from improved biogas yield, cost saving by economy of scale and the sharing of equipment, and easier handling of mixed wastes ( Li et al., 2009 Li, X., Li, L., Zheng, M., Fu, G., Lar, J. and Rahman, S., Prospect of anaerobic co-digestion of dairy manure: A review. The positive effects of the co-digestion concept have been widely reported ( Atandi and Rahman, 2012 Atandi, E. The methane yield from manure is relatively low thus, co-digestion of manure with organic substrates with a high content of lipids, proteins or carbohydrates, is necessary for the biogas plant's economy. and Ellegaard, L., Codigestion of manure and organic wastes in centralized biogas plants. ![]() Co-digestion of manure with several organic wastes is a common practice applied in the Danish centralized biogas plants for more than two decades ( Angelidaki and Ellegaard, 2003 Angelidaki, I. The biogas process is a sustainable process for energy production, waste treatment and recycling of organic waste nutrients. Methane Anaerobic digestion Modelling Co-digestion Manure Subsequently, some experiments were reproduced, in order to evaluate the synergy obtained in the previous simulation and validate the model. The present work investigated the interactions between different simple co-substrates (carbohydrate, lipid and protein) and real co-substrates (corn silage, fodder beet, grass and wheat straw) under co-digestion with manure, in order to verify synergetic effects. This mathematical modelling provides an understanding of the processes and interactions occurring inside the biogas system. Biogas process modelling describes the kinetics and stoichiometry of different steps in the anaerobic digestion process. Co-digestion has become more and more powerful since it is possible, with the use of abundant and cheap substrates, to dilute the inhibitory effects of various other substrates, making the process of anaerobic digestion more efficient and stable. Biogas production is becoming increasingly important in the environmental area because, besides treating wastewaters, it also generates energy.
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