Luiz Franciele Natividade, Lourenço Emilene de Carvalho, Gomes Guilherme Pavão, Becker Márcia Regina
Interdisciplinary Graduate Studies Programme in Energy and Sustainability, Federal University of Latin American Integration (UNILA), Foz do Iguaçu, Brazil.
Graduate Studies Programme in Chemistry (PPGQ), Federal University of Paraná (UFPR), Curitiba, Brazil.
Environ Technol. 2025 Aug 31:1-10. doi: 10.1080/09593330.2025.2548634.
This study evaluates biogas production from co-digested organic waste in a bench-scale semi-continuous Continuous Stirred Tank Reactor (CSTR). The use of organic waste in anaerobic digestion (AD) enables sustainable practices that help diversify the energy portfolio and reach decarbonization goals. However, the challenges associated with the operation of anaerobic reactor require studies and guidelines aimed at strategies for establishing biogas plants. This study assesses the production potential at the start of the operation of a Continuous Stirred Tank Reactor (CSTR), using a mixture of organic solid waste (OSW) that includes food waste, olive oil and pasta, selected for their high organic load and lipid-rich composition-was used to assess biogas production potential at startup. Essays were performed to determine biogas production and Biochemical Methane Potential (BMP) for progressive Organic Loading Rates (OLR) added to the semi-continuous reactor. The maximum biogas yield, based on the value obtained in the BMP assay occurred at an OLR of 4.49 gVS/L, while higher rates led to system instability and a significant drop in performance to 22% Volatile Solids (VS) removal remained above 70% and the methane content achieved excellent levels throughout the operation. This study shows the feasibility of using co-digestion of organic waste to produce biogas with excellent methane and highlights the innovative application of progressive OLR ramping as a start-up strategy that stabilizes anaerobic reactor performance, addressing common challenges in biogas plant implementation. Additionally, the results underscore the contribution of biogas to achieving energy sustainability goals and reducing greenhouse gas emissions.
本研究在实验室规模的半连续连续搅拌釜式反应器（CSTR）中评估了共消化有机废物产生沼气的情况。在厌氧消化（AD）中使用有机废物能够实现可持续发展实践，有助于使能源组合多样化并实现脱碳目标。然而，厌氧反应器运行相关的挑战需要开展研究并制定指导方针，以针对建立沼气厂的策略。本研究评估了连续搅拌釜式反应器（CSTR）运行初期的生产潜力，使用了包括食物垃圾、橄榄油和意大利面在内的有机固体废物（OSW）混合物，因其高有机负荷和富含脂质的成分而被选中，用于评估启动时的沼气生产潜力。进行了相关试验，以确定向半连续反应器中逐步增加有机负荷率（OLR）时的沼气产量和生化甲烷潜力（BMP）。基于BMP试验获得的值，最大沼气产量出现在OLR为4.49 gVS/L时，而更高的速率会导致系统不稳定，性能显著下降至22%，挥发性固体（VS）去除率在整个运行过程中保持在70%以上，甲烷含量达到了优异水平。本研究表明了利用有机废物共消化生产具有优异甲烷含量沼气的可行性，并突出了逐步增加OLR作为启动策略的创新应用，该策略可稳定厌氧反应器性能，解决沼气厂实施中的常见挑战。此外，结果强调了沼气对实现能源可持续性目标和减少温室气体排放的贡献。
