Anaerobic fermentation of cattle manure: Modeling of hydrolysis and acidogenesis

• Published in: Water research (Oxford) Vol. 41; no. 2; pp. 323 - 332
• Main Authors: Myint, M., Nirmalakhandan, N., Speece, R.E.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 2007; Elsevier Science
• Subjects: Acidogenesis; Acids - metabolism; anaerobic conditions; anaerobic digestion; Anaerobic hydrolysis; Anaerobiosis - physiology; animal manure management; Animals; Applied sciences; Bacteria, Anaerobic - metabolism; biodegradation; Bioreactors; Cattle; Cattle manure; Cellulose; Cellulose - metabolism; Exact sciences and technology; fermentation; Fermentation - physiology; Hemicellulose; Hydrolysis; Kinetics; Manure - analysis; Manure - microbiology; mathematical models; mechanism of action; model validation; Models, Biological; Other industrial wastes. Sewage sludge; Pollution; Process model; reaction mechanisms; Refuse Disposal - methods; solid wastes; waste management; waste treatment; Wastes; Water treatment and pollution; Process model; Hemicellulose; Acidogenesis; Cattle manure; Cellulose; Anaerobic hydrolysis; Correlation coefficient; Surface reaction; Waste treatment; Anaerobic hydrolysis Acidogenesis Cattle manure Process model Cellulose Hemicellulose; Biomass; Calibration; Farmyard manure; Modeling; Anaerobic digestion; Hydrolysis; Batchwise; Anaerobe; Kinetics; Agricultural waste; Biological treatment; Mathematical model; Animal waste
• ISSN: 0043-1354; 1879-2448
• DOI: 10.1016/j.watres.2006.10.026

A mathematical model for the hydrolysis and acidogenesis reactions in anaerobic digestion of cattle manure is presented. This model is based on the premise that particulate hydrolysable fraction of cattle manure is composed of cellulose and hemicellulose that are hydrolyzed at different rates according to a surface-limiting reaction; and, that the respective soluble products of hydrolysis are utilized by acidogens at different rates, according to a two-substrate, single-biomass model. Batch experimental results were used to identify the sensitive parameters and to calibrate and validate the model. Results predicted by the model agreed well with the experimentally measured data not used in the calibration process, with correlation coefficient exceeding 0.91. These results indicate that the most significant parameter in the hydrolysis–acidogenesis phase is the hydrolysis rate constant for the cellulose fraction.