A mathematical model for dynamic simulation of anaerobic digestion of complex substrates: Focusing on ammonia inhibition

TLDR

A mathematical model for anaerobic digestion of complex organic material, such as manure, was developed to investigate ammonia inhibition, incorporating detailed pH and temperature dynamics to accurately simulate free ammonia concentration. The model consists of an enzymatic hydrolytic step, four bacterial steps, and 12 chemical compounds, with free ammonia and acetate identified as the primary modulating factors. When applied to cattle manure in continuously stirred tank reactors, the model’s predictions matched experimental data, demonstrating its validity. © 1993 John Wiley & Sons, Inc.

Abstract

Abstract A mathematical model for anaerobic degradation of complex organic material, such as manure, has been developed. The model includes an enzymatic hydrolytic step and four bacterial steps and involves 12 chemical compounds. The model focuses on ammonia inhibition and includes a detailed description of pH and temperature characteristics in order to accurately simulate free ammonia concentration. Free ammonia and acetate constitute the primary modulating factors in the model. The model has been applied for the simulation of digestion of cattle manure in continuously stirred tank reactors (CSTRs), and results compare favorably with experimental data. © 1993 John Wiley & Sons, Inc.