Exploring the intersection of bioreactor technology and hydrogen energy: Experimental research and numerical modeling

Biogas production involves the complex process of anaerobic digestion in bioreactors. This paper presents numerical modeling results and analysis of bioreactors. We discuss research methodology, model geometry, internal bioreactor processes, and possible modifications. Two mathematical models and their results are detailed, including PDE models and discussions on their outcomes. Additionally, qualitative and quantitative biogas parameters were experimentally studied using chicken manure biomass and a bioreactor prototype, with and without biomass mixing. Mixing increased CH4 concentration, with maximum levels of 77.5 % and 63.2 % for mixed and unmixed biomass, respectively. Biogas yield increased by up to 36.0 % with biomass mixing, demonstrating its impact on production efficiency. Furthermore, this research identifies opportunities for integrating hydrogen energy within biogas systems. By capturing and utilizing CO2 during biogas upgrading processes, such as biogas-to-hydrogen conversion, environmental benefits and carbon capture are realized. Utilizing captured CO2 for carbon capture and storage (CCS) or synthesizing synthetic methane underscores the renewable energy potential of biogas systems. In summary, this study provides insights into biogas production dynamics and highlights potential synergies between biogas production and hydrogen energy. These findings contribute to advancing understanding of renewable energy systems and their role in sustainable energy futures. • Enhanced biogas yield by 36.0 % through mechanical mixing, optimizing bacterial activity. • Achieved 100.0 % temperature uniformity after 300 s of mixing. • Increased methane concentration from 63.2 % to 77.5 % via mechanical mixing. • Proposed modifications for cost-efficient and scalable biogas production.