Biochemical Methane Potential and Kinetics on Anaerobic Co-digestion of Food Waste and Cellulose-based Food Packaging Product
Keywords:Biochemical methane potential, Food waste, Cellulose-based food packaging product, Co-digestion, Kinetics
Anaerobic co-digestion is proven to be a promising technology for enhancing the production of methane. In this study, the biochemical methane potential (BMP) from anaerobic co-digestion of food waste (FW) and cellulose-based food packaging product (CFPP) was carried out under mesophilic (35 ± 2°C) condition in a batch mode for 45 days. Three mixing ratios of these two substrates (FW/CFPP 100:0, 40:60, and 0:100 based on volatile solids (VS)) were studied with a substrate-to-inoculum ratio of 0.5. Sodium bicarbonate (NaHCO3) was also added to establish a stable anaerobic digestion process. In addition, four mathematical models (Modified Gompertz model, First-order model, Monod model, and Cone model) were employed to evaluate their suitability for predicting the methane production of the examined substrates. Based on the obtained results, it is found that the maximum cumulative methane yield was observed in FW/CFPP 100:0, followed by 40:60 and 0:100 with the values of 459.15, 381.79, and 355.60 NmL/gVS, respectively. Among all the studied kinetic models, it can be seen that the Modified Gompertz model was the most accurate and appropriate in predicting the methane production of FW/CFPP 100:0 and 0:100. However, in the case of FW/CFPP 40:60, the First-order model was found to be a better fit than the Modified Gompertz model. Besides, their kinetic parameters reveal that the co-digestion of FW/CFPP 40:60 had a faster methane production rate than the mono-digestion of FW or CFPP.
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