Laboratory of Chemical and Environmental Technology, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Soil and Water Resources Institute, Hellenic Agricultural Organisation Dimitra, Thermi-Thessaloniki 57001, Greece.
Department of Biology, University of Padova, Via U. Bassi 58/b, 35121 Padua, Italy.
Bioresour Technol. 2023 Oct;385:129456. doi: 10.1016/j.biortech.2023.129456. Epub 2023 Jul 3.
Packing materials improve biological methanation efficiency in Trickle Bed Reactors. The present study, which lies in the field of energy production and biotechnology, entailed the evaluation of commercial pelletized activated carbon and Raschig rings as packing materials. The evaluation focused on monitoring process indicators and examining the composition of the microbial community. Activated carbon resulted in enhanced methane purity, achieving a two-fold higher methane percentage than Raschig rings, maintaining a stable pH level within a range of 7-8 and reducing gas retention time from 6 h to 90 min. Additionally, the digestate derived from biogas plant was found to be a sufficient nutrient source for the process. Fermentative species with genes for β-oxidation, such as Amaricoccus sp. and Caloramator australicus could explain the production of hexanoic and valerate acids during reactor operation. Based on the physical properties of packing materials, the efficiency of biological methanation could be maximized.
包装材料可提高滴流床反应器中的生物甲烷化效率。本研究属于能源生产和生物技术领域，评估了商业颗粒状活性炭和拉西环作为包装材料。评估重点在于监测过程指标和检查微生物群落的组成。活性炭提高了甲烷纯度，甲烷百分比比拉西环高出两倍，将 pH 值稳定在 7-8 范围内，并将气体保留时间从 6 小时缩短至 90 分钟。此外，沼气厂的消化物被发现是该过程的充足养分来源。具有β-氧化基因的发酵物种，如 Amaricoccus sp. 和 Caloramator australicus，可以解释在反应器运行过程中产生己酸和戊酸。基于包装材料的物理性质，可以最大限度地提高生物甲烷化的效率。
