pH的基本作用在CH4生物转化为多基酸盐的混合甲类培养中
V Pérez1, R Lebrero1, R Muñoz1
1Institute of Sustainable Processes, Valladolid University, Dr. Mergelina s/n, Spain; Department of Chemical Engineering and Environmental Technology, Valladolid University, Prado de la Magdalena 5, Valladolid, Spain.
Chemosphere
|April 3, 2024
概括
优化pH值是将甲 (CH4) 转化为多基酸盐 (PHAs) 的关键. 较高的pH值提高了CH4的转化率,而较低的pH值增加了特定细菌的PHA积累,这对生物炼油厂至关重要.
科学领域:
- 环境微生物学 环境微生物学
- 生物技术是生物技术.
- 生物精炼是生物精炼的一种方式.
背景情况:
- 气候变化和塑料污染是环境面临的主要挑战.
- 将甲 (CH4) 生物转化为多基酸 (PHAs) 为减轻CH4排放和生产可生物降解的聚合物提供了一种双重解决方案.
- 工业应用需要优化CH4到PHA的生物转化.
研究的目的:
- 研究培养pH对细菌生长,CH4生物转化,PHA积累和微生物群落结构的影响.
- 为了确定最佳的pH条件,以有效地CH4-PHA生物转化在甲类细菌.
主要方法:
- 在乏下在动水箱生物反应器中培养甲型细菌.
- 用不同的pH值 (5.5,7,8.5,10) 进行实验.
- 对CH4生物转化率,PHA积累,生物质生长和细菌群体结构的分析.
主要成果:
- 随着pH值的上升而增加的CH4消除率,在pH值8.5时达到50.4g的CH4·m−3·h−1,可能是由于增强的气液质量转移.
- 在较低的pH值下,聚-3-基酸盐 (PHB) 积聚率更高,在pH值5.5时达到43.7%w·w−1,这归因于Methylocystis等II型甲类动物的选择.
- 持续高的CH4生物降解率48小时后的缺乏,由细胞内PHB积累支持.
结论:
- pH 在CH4-PHA生物转化效率中起着关键和多因素的作用.
- 对于CH4转化率 (性) 和PHA积累 (酸性) 存在不同的pH最佳值.
- 这些发现为优化未来生物炼油厂中CH4生物转化过程提供了关键的见解.
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