Enhancing Anaerobic Co-Digestion with Locally Sourced Biochar: A Kinetic Analysis of Biogas Production Efficiency

In the quest for sustainable waste management, this study investigates the eco-friendly valorization of food waste (FW) and cattle rumen contents (CRC) into valuable resources via anaerobic co-digestion (AcD). The process is enhanced by the addition of locally sourced biochar (LSB), serving as an exogenous additive. The LSB efficacy as a biomass utilization enhancer and adsorbent was assessed, particularly on biogas production efficiency. The AcD was performed in a sealed cylindrical column for ۳۶ days, with the biogas yield quantified through water displacement in an inverted cylinder. The apex of biogas production was recorded on day ۱۶, with a yield of ۰.۷۲۴۴ ml/gVS following the addition of ۱۰ g of LSB. The LSB incorporation was associated with a decrease in physicochemical parameters, indicative of its capacity to degrade or adsorb inhibitory substances, thus boosting biogas production. Kinetic modelling was utilized to simulate the digestion process, employing the first-order kinetic model, modified Gompertz model, and the cone model. The modified Gompertz model exhibited the most accurate fit, as demonstrated by the lowest variance (۵۷.۳۳-۲۲۵.۱%) between the actual and predicted methane yields, along with the highest R۲ values (۰.۹۱۳-۰.۹۷۶). These results highlight the potential of LSB to act as a stabilizing agent in AcD, thereby enhancing biogas generation from organic waste.

کلیدواژه ها:

Biogas ، Anaerobic Co-Digestion ، Biochar ، Food waste ، Cattle rumen contents