PDF(Pubmed)
Abstract：
BACKGROUND: The aim of this study was to increase the accessibility and accelerate the breakdown of lignocellulosic biomass to methane in an anaerobic fermentation system by mechanical cotreatment: milling during fermentation, as an alternative to conventional pretreatment prior to biological deconstruction. Effluent from a mesophilic anaerobic digester running with unpretreated senescent switchgrass as the predominant carbon source was collected and subjected to ball milling for 0.5, 2, 5 and 10 min. Following this, a batch fermentation test was conducted with this material in triplicate for an additional 18 days with unmilled effluent as the \'status quo\' control.
RESULTS: The results indicate 0.5 - 10 min of cotreatment increased sugar solubilization by 5- 13% when compared to the unmilled control, with greater solubilization correlated with increased milling duration. Biogas concentrations ranged from 44% to 55.5% methane with the balance carbon dioxide. The total biogas production was statistically higher than the unmilled control for all treatments with 2 or more minutes of milling (α = 0.1). Cotreatment also decreased mean particle size. Energy consumption measurements of a lab-scale mill indicate that longer durations of milling offer diminishing benefits with respect to additional methane production.
CONCLUSIONS: Cotreatment in anaerobic digestion systems, as demonstrated in this study, provides an alternative approach to conventional pretreatments to increase biogas production from lignocellulosic grassy material.
RESULTS: The results indicate 0.5 - 10 min of cotreatment increased sugar solubilization by 5- 13% when compared to the unmilled control, with greater solubilization correlated with increased milling duration. Biogas concentrations ranged from 44% to 55.5% methane with the balance carbon dioxide. The total biogas production was statistically higher than the unmilled control for all treatments with 2 or more minutes of milling (α = 0.1). Cotreatment also decreased mean particle size. Energy consumption measurements of a lab-scale mill indicate that longer durations of milling offer diminishing benefits with respect to additional methane production.
CONCLUSIONS: Cotreatment in anaerobic digestion systems, as demonstrated in this study, provides an alternative approach to conventional pretreatments to increase biogas production from lignocellulosic grassy material.
摘要：
背景：这项研究的目的是通过机械共处理：发酵过程中的碾磨，在厌氧发酵系统中增加木质纤维素生物质的可及性并加速将其分解为甲烷，作为生物解构前常规预处理的替代方案。收集来自嗜温厌氧消化器的废水，该消化器以未经预处理的衰老柳枝枝作为主要碳源，并进行球磨0.5、2、5和10分钟。在此之后,用这种材料一式三份进行分批发酵测试，再进行18天，未研磨的废水作为“现状”对照。
结果：结果表明，与未研磨的对照相比，共处理0.5-10分钟的糖溶解增加了5-13％，更大的增溶与增加的研磨持续时间相关。沼气浓度范围为44％至55.5％甲烷，余量为二氧化碳。对于具有2分钟或更长时间的研磨(α=0.1)的所有处理,总沼气产量在统计学上高于未研磨的对照。配种也降低了平均粒径。实验室规模磨机的能耗测量表明，相对于额外的甲烷生产，更长的研磨持续时间提供了逐渐减少的好处。
结论：厌氧消化系统的协同处理，正如这项研究所证明的，提供了常规预处理的替代方法，以增加来自木质纤维素草材料的沼气产量。
结果：结果表明，与未研磨的对照相比，共处理0.5-10分钟的糖溶解增加了5-13％，更大的增溶与增加的研磨持续时间相关。沼气浓度范围为44％至55.5％甲烷，余量为二氧化碳。对于具有2分钟或更长时间的研磨(α=0.1)的所有处理,总沼气产量在统计学上高于未研磨的对照。配种也降低了平均粒径。实验室规模磨机的能耗测量表明，相对于额外的甲烷生产，更长的研磨持续时间提供了逐渐减少的好处。
结论：厌氧消化系统的协同处理，正如这项研究所证明的，提供了常规预处理的替代方法，以增加来自木质纤维素草材料的沼气产量。
