Modeling Anaerobic Co-digestion of Food Wastes and Cattle Manure in an Industrial Plant: a System Dynamic Approach

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Abstract Even though the Anaerobic Digestion Model number 1 (ADM1) is acceptable and widely used model for anaerobic digestion, it is associated with large number of experimental data and large number of model parameter identification thereby making it difficult to be utilized for optimization and control design. In this study, the applicability of Anaerobic Digestion Model number 2 (AM2) model to co-digestion of food wastes and cattle manure in an industrial biogas plant’s digester is explored. The model was modified and reconstructed in system dynamic modeling software (STELLA) for better interpretation and understanding. The predictive ability of the model using the model parameters estimated in Premium Solver was checked by comparing model results (biogas flow and compositions) with ADMI simulated results and the experimental data. In order to gain insight on variability of biogas flow and compositions as a result of change in some important process variables, sensitivity analysis was conducted. The simulation results of the modified AM2 model were found to correspond with the measured value with percentages errors of 1.42% and 0.6% for methane concentration and biogas flow respectively. The process variables associated with methanogenesis stage were obtained to be the most sensitive variables. The use of system dynamic modeling linked to AM2 model which is tractable, reduced and robust is therefore recommended for simulation of full scale biogas plant’s digester.

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