Department of Biosystems and Agricultural Engineering, University of Kentucky, 128 CE Barnhart Building, Lexington, KY, USA.
Department of Biosystems and Agricultural Engineering, University of Kentucky, 128 CE Barnhart Building, Lexington, KY, USA.
J Environ Manage. 2024 Sep;367:121975. doi: 10.1016/j.jenvman.2024.121975. Epub 2024 Jul 30.
Stillage of American whiskey (e.g., bourbon) manufacturing is an abundant byproduct that is distinguished from fuel ethanol and malt whisky stillage materials by its highly inconsistent nature due to variability in mash bill composition. The impact of stillage physicochemical characteristics on biomethane production through anaerobic digestion was assessed by characterizing American whiskey stillage samples before batch biochemical methane potential tests of whole stillage. A maximum methane yield of 419 Nml CH/g VS was obtained under food to microbe ratio (F: M) of 0.5 and organic loading rate (OLR) of 10 g VS/L while digester instability was noted under F: M ratios exceeding 0.5 under batch production. Methane production was significantly influenced by the mash bill composition with lowest methane yields obtained with higher rye content (rye whiskey) and highest methane yields obtained with higher corn content (bourbon or corn whiskey). A multiple linear regression model including C, P, N, and Na was able to accurately describe the methane yield (R = 0.93). This study provides valuable insights to aid the design of anaerobic digesters generating renewable natural gas from heterogeneous American whiskey stillage.
美国威士忌（例如波本威士忌）制造的酒糟是一种丰富的副产品，由于麦芽配方组成的变化，其性质极不一致，有别于燃料乙醇和麦芽威士忌酒糟材料。通过分批生化甲烷潜能测试前对美国威士忌酒糟样品进行特性分析，评估了酒糟理化特性对厌氧消化生物甲烷生产的影响。在进料与微生物比（F:M）为 0.5 和有机负荷率（OLR）为 10 g VS/L 时，获得了 419 Nml CH/g VS 的最大甲烷产量，而在分批生产中 F:M 比超过 0.5 时，消化器不稳定。甲烷产量受到麦芽配方组成的显著影响，含较高黑麦含量（黑麦威士忌）的酒糟的甲烷产量最低，而含较高玉米含量（波本威士忌或玉米威士忌）的酒糟的甲烷产量最高。包括 C、P、N 和 Na 的多元线性回归模型能够准确描述甲烷产量（R=0.93）。本研究为设计从异构美国威士忌酒糟中产生可再生天然气的厌氧消化器提供了有价值的见解。
