不同类型的挥发性脂肪酸对批量反应堆中的性能和细菌群体的影响,该反应堆执行生物营养物质去除
Ruby Diaz1, Soklida Hong1, Ramesh Goel1
1Department of Civil and Environmental Engineering, University of Utah, Salt Lake City, UT 84112, USA.
Bioresource technology
|August 25, 2023
概括
挥发性脂肪酸 (VFA) 有效地为生物营养反应堆 (BNR) 提供燃料超过500天,实现了高和-去除. 观察到微生物群落的变化,包括Candidatus Accumulibacter的增加,但没有影响BNR的性能.
科学领域:
- 环境微生物学 环境微生物学
- 废水处理工程 废水处理工程
- 生物技术是生物技术.
背景情况:
- 生物营养去除 (BNR) 过程对于废水处理至关重要.
- 挥发性脂肪酸 (VFA) 是影响BNR中的微生物群落的关键碳来源.
- 了解微生物动态对于优化营养去除效率至关重要.
研究的目的:
- 调查不同挥发性脂肪酸 (VFA) 比率对BNR性能的影响.
- 分析微生物群落的变化,特别是聚酸盐积聚生物 (PAO) 和糖原积聚生物 (GAO).
- 评估特定微生物群体在不同VFA条件下的营养去除中的作用.
主要方法:
- 实验室规模的BNR运行,用四个阶段的不同VFA比率供给.
- 监测操作参数,包括溶解和-去除效率.
- 使用16S rRNA基因测序进行微生物社区分析,以确定关键品种的相对丰度.
主要成果:
- 持续高的去除效率 (>90%的,>98%的-) 超过500天.
- 当酸盐和酸盐是主要的碳来源时,Candidatus Accumulibacter的丰度显著增加 (从10%到57%).
- 在Clade IIC.中减少了Defluviicoccus (GAO) 丰度 (从41%降至5%) 和识别了非化积累生物 (DPAO).
结论:
- VFA显著影响了BNR中的微生物社区结构,有利于像Candidatus Accumulibacter.这样的PAO.
- 存在Defluviicoccus并没有损害BNR过程的稳定性或性能.
- 鉴定出能够利用亚酸盐的非化积聚生物 (DPAO),突出了提高营养物质去除的潜力.
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