A numerical modelling using ADM1 model in the co-anaerobic digestion of food waste with varying fat fractions to generate biogas

The impact of different fat contents and different degrees of hydrolysis on the anaerobic digestion process and the production of biogas is the subject of this paper and the evaluation is conducted with the aid of the ADM1 model. Anaerobic digestion is one of the most important steps of the biogas production from organic wastes and it contains mainly methane (CH₄) and carbon dioxide (CO₂). The study shows clearly that each concentration of fat improves methane production with 15% fat concentration giving the highest output at a rate of 0.75 m³/kg at day 20 as compared to the 0.10 m³/kg from 0% fat concentrations. Also, the extent of hydrolysis profoundly predicts the degradation of the complex organic material; the greatest hydrolysis rate of 0.25h⁻¹ gave methane of 0.70 m³/kg, which is about 75% higher than lesser rates. The existing study also shows that there was a direct relationship between the density of organic acids, hydrogen and CO₂ with the degree of fat content and rates of hydrolysis. Hence the results presented in this paper underscore the significance of defining fat and its hydrolyses in relation to the biogas production so as to improve the efficiency and stability of the anaerobic digestion process as the complex organic matters diminish. What this research offers is knowledge indispensable to enhancing the efficiency of energy extraction from organic waste, thereby enriching the contemporary discourse on waste management.