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Anaerobic Digestion Modelling
Anaerobic digestion is a well-established technology for stabilization and conversion of various organic wastes into bioenergy. Typical sources of organic wastes suitable for anaerobic digestion are mainly from municipal, agricultural and industrial producers. Because anaerobic digestion is such a complex process, mathematical modelling could assist in providing better understanding, design, optimization and prediction of the performance of anaerobic digesters. State-of-the-art models have been developed to simulate the methane yield improvement, reactor stability enhancement, operational issue identification and waste codigestion in anaerobic digestion systems.
In this chapter, a summary of existing anaerobic digestion models is presented. These models were derived for describing substrates characteristics, rate-limiting conditions, process inhibition, operating conditions, methane potential and production rate, liquid–gas interface mass transfer, as well as the application of computational fluid dynamics. A discussion with regard to their different assumptions, structures, applications and limitations is included. Modelling procedure adopted in the course of model structure selection, parameter estimation and model validation methods is also described. Finally, future work identifying the research needs in modelling anaerobic digestion is proposed. The intent of the authors of this chapter is to provide a comprehensive understanding of the fundamental concepts used in anaerobic digestion modelling and to provide ideas for further research work.
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Series Edited by: Yebo Li, Department of Chemical and Biomolecular Engineering, The Ohio State University, USA and Xumeng Ge, Ohio State University, Columbus, USA
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