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A comprehensive model of anaerobic bioconversion of complex substrates to biogas
Author(s) -
Angelidaki Irini,
Ellegaard Lars,
Ahring Birgitte K.
Publication year - 1999
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/(sici)1097-0290(19990505)63:3<363::aid-bit13>3.0.co;2-z
Subject(s) - bioconversion , chemistry , substrate (aquarium) , biogas , manure , hydrolysis , ammonia , glycerol , wastewater , pulp and paper industry , biochemistry , organic chemistry , waste management , fermentation , agronomy , biology , ecology , engineering
Abstract A dynamic model describing the anaerobic degradation of complex material, and codigestion of different types of wastes, was developed based on a model previously described (Angelidaki et al., 1993). In the model, the substrate is described by its composition of basic organic components, i.e., carbohydrates, lipids, and proteins, the concentration of intermediates such as volatile fatty acids and long‐chain fatty acids, and important inorganic components, i.e., ammonia, phosphate, cations, and anions. This allows dynamic changes of the process during a shift of substrate composition to be simulated by changing the input substrate data. The model includes 2 enzymatic hydrolytic steps, 8 bacterial steps and involves 19 chemical compounds. The model also includes a detailed description of pH and temperature characteristics. Free ammonia, acetate, volatile fatty acids, (VFA) and long‐chain fatty acids (LCFA) constitute the primary modulating factors in the model. The model was tested with success in lab‐scale reactors codigesting manure with glycerol trioleate or manure with gelatin. Finally, the model was validated using results from a full‐scale biogas plant codigesting manure together with a proteinous wastewater and with bentonite‐bound oil, which is a waste with high content of lipids. © 1999 John Wiley & Sons, Inc. Biotechnol Bioeng 63: 363–372, 1999.