一个超热友的无氧发酵平台,用于从热水解污泥中高效地生产短链脂肪酸
Zhan Chen1, Shihui Zhu1, Shan Gao1
1State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
Water research
|August 13, 2023
概括
一个高热性无氧发酵 (HAF) 平台有效地将热水解污泥 (THS) 转化为短链脂肪酸 (SCFA). 最佳的3天固体保留时间 (SRT) 最大限度地提高了酸盐的生产和产量,而生物气的产生最小.
科学领域:
- 环境生物技术 环境生物技术
- 生物化学工程 生物化学工程
- 微生物生态学 微生物生态学
背景情况:
- 污水处理污泥对处置来说是一个很大的挑战.
- 从污泥中提取有价值的产品,如短链脂肪酸 (SCFA) 是一个新兴的研究领域.
- 高热性无氧发酵 (HAF) 提供了在高温下高效转化有机物质的潜力.
研究的目的:
- 建立和评估一个碳酸盐平台,用于使用HAF从热水解污泥 (THS) 生产SCFA.
- 研究HAF系统在不同固体保留时间 (SRT) 下的长期性能和微生物群体动态.
- 确定与最佳SCFA生产相关的关键微生物生物标志物.
主要方法:
- 开发一个在70°C下运行的HAF系统,用于从THS中生产SCFA.
- 系统地调查不同SRT的HAF性能 (SCFA度,生产率,产量).
- 使用属级生物标志物的微生物群落的分析和与SCFA生产的相关性.
- 监测生物气生产和抑制因素,如甲基生成,总氨 (TAN) 和自由氨 (FAN).
主要成果:
- 3天的最佳SRT产生了最高的酸盐生产率 (1.12gCOD/L/d,SCFA的60%).
- 总的来说,SCFA的产量达到6.61gCOD/L,生产率为1.86gCOD/L/d,产量为324gCOD/kgVSS.
- 由于超热和高氨含量抑制甲生成,产生了最小的沼气.
- 主导的微生物属 (Tepidimicrobium,Bhargavaea,XBB1006) 被确定为从各种有机化合物中生产SCFA的关键参与者.
结论:
- 已建立的HAF碳酸盐平台是有效的高效率的SCFA从过剩的污泥生产.
- 超热性条件和高氨水平有效抑制甲生成,增强作为SCFA的碳回收.
- 已确定的微生物联盟对于将复杂有机物分解为有价值的SCFA至关重要,提供了可持续的污泥利用战略.
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