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Development of a mathematical model for the simulation of the biodegradation of organic substrates in a high‐solids anaerobic digestion process
Author(s) -
Kayhanian Masoud,
Tchobanoglous George,
MataAlvarez Joan
Publication year - 1996
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199607)66:3<312::aid-jctb497>3.0.co;2-z
Subject(s) - anaerobic digestion , biogas , biodegradation , process (computing) , chemistry , total dissolved solids , biodegradable waste , fraction (chemistry) , municipal solid waste , suspended solids , pulp and paper industry , waste management , chemical engineering , environmental science , environmental engineering , chromatography , wastewater , organic chemistry , engineering , methane , computer science , operating system
A kinetic model is developed to simulate the biodegradation of the organic fraction of municipal solid waste in a high‐solids complete‐mix continuous‐flow anaerobic digestion process. A mass balance correction factor ( f ) is used to account for (i) the water that is incorporated into the production of biogas, and (ii) the water vapor present in the biogas. With the inclusion of the factor f , expressions are developed to determine the substrate removal efficiency based on first‐order and Monod kinetic models. Simulations using first‐order and Monod kinetic models are carried out to illustrate the importance of the f factor on the substrate mass removal and microorganism concentration in the high‐solids anaerobic digestion process. The effect of the value of f on kinetic constants, and the error involved in considering the high‐solids process as a low‐solids process are discussed. Finally, experimental results from a pilot‐scale high‐solids complete‐mix batch‐fed anaerobic digestion process are used to estimate the first‐order rate constant for the biodegradable fraction of municipal solid waste.