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分离液压和固体保留时间对富含碳水化合物的残留物转化为碳酸酸的效应
Adrián Lago1,2, Silvia Greses1, Kaoutar Aboudi1,3
1Biotechnological Processes Unit, IMDEA Energy, Avda. Ramón de la Sagra 3, 28935, Móstoles, Madrid, Spain.
Scientific reports
|November 23, 2023
概括
在甜菜糖的无氧发酵过程中,将液压保留时间 (HRT) 和固体保留时间 (SRT) 分离,最大限度地提高了挥发性脂肪酸 (VFA) 的产量. HRT是指导特定VFA转换路线的关键.
科学领域:
- 生物技术是生物技术.
- 环境工程 环境工程
- 生物化学工程 生物化学工程
背景情况:
- 无氧发酵是生产挥发性脂肪酸 (VFA) 的关键过程.
- 优化反应堆条件,例如液压保留时间 (HRT) 和固体保留时间 (SRT),对于最大限度地提高VFA产量和组成至关重要.
- 甜菜糖是VFA生产的可行的基质.
研究的目的:
- 评估HRT和SRT脱对从甜菜糖中生产的VFA产生的影响.
- 为了比较连续水箱反应堆 (CSTR) 与无氧测序批量反应堆 (AnSBRs) 在各种HRT下的性能.
- 确定最佳的HRT以最大限度地提高VFA产量和特定的VFA生产.
主要方法:
- 批量反应堆研究在25°C,35°C和55°C进行,以确定VFA生产的最佳温度,选择25°C.
- 连续水箱反应堆 (CSTR) 和两个无氧测序批量反应堆 (AnSBR) 用30天的固定的SRT和变化的HRTs (20和10天) 运行.
- 分析了生物转化效率和VFA成分 (包括酸等特定酸).
主要成果:
- 带有20天HRT的ANSBR与CSTR (34.9%) 相比,实现了更高的VFA生物转化效率 (55.5%).
- CSTR倾向于生产酸 (25.4%的总VFA),而AnSBR的产量较少 (4.1%).
- 在ANSBR中将HRT减少到10天,由于乳酸积累,效率降至21.7%.
结论:
- 分离HRT和SRT有效地提高了整体VFA生产.
- HRT 作为一个关键的控制参数,以引导无氧发酵向特定的 VFA 配置,如丁酸盐或乳酸盐发酵.
- 在ANSBR中优化HRT可以显著提高比CSTRs的甜菜糖的VFA产量.
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