Biological Processes Laboratory (LPB), São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, São Paulo, 13563-120, Brazil.
Biological Processes Laboratory (LPB), São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, São Paulo, 13563-120, Brazil.
J Environ Manage. 2022 May 15;310:114768. doi: 10.1016/j.jenvman.2022.114768. Epub 2022 Feb 25.
Ethanol and biodiesel industries generate large volumes of by-products, such as vinasse and glycerol, which are suitable for biogas exploitation. This paper assessed the applicability and process performance of the anaerobic structured-bed reactor (AnSTBR) for the mesophilic (30 °C) continuous (105 days) anaerobic co-digestion of sugarcane vinasse and distilled glycerol under increasing organic loading rates (OLR) (0.5-5.0 kgCOD md). The highest methane yield (211 NmL gCOD) and volumetric production (668 NmL Ld) occurred at an OLR of 3.5 kgCOD md. The performance of the AnSTBR showed high removal efficiencies of total COD (77.1%), carbohydrates (81.9%), and glycerol content (99.7%). Biofilm growth enhancement within the reactor offset the impairment of methanogenesis activity at high organic loads. The prompt biodegradability of glycerol reinforced the importance of gradually increase the organic load to prevent the buildup of volatile acids and maintain a stable long-term co-digestion system.
乙醇和生物柴油产业会产生大量的副产物，如酒糟和甘油，这些副产物适合沼气开发。本文评估了厌氧结构床反应器（AnSTBR）在中温（30°C）条件下，连续（105 天）对甘蔗酒糟和蒸馏甘油进行厌氧共消化的适用性和工艺性能，OLR（0.5-5.0 kgCOD md）逐渐增加。在 OLR 为 3.5 kgCOD md 时，甲烷产量（211 NmL gCOD）和体积产率（668 NmL Ld）最高。AnSTBR 的性能表现出对总 COD（77.1%）、碳水化合物（81.9%）和甘油含量（99.7%）的高去除效率。反应器内生物膜的生长增强抵消了高有机负荷下甲烷生成活性的损害。甘油的快速生物降解性强化了逐渐增加有机负荷以防止挥发性酸积累并维持稳定的长期共消化系统的重要性。
