生物膜和颗粒污泥如何在anammox过程中应对溶解氧暴露:性能,生物积累特征和细菌进化
Ben-Ze Chang1, Xiao-Lan Huang1, Dong-Zhi Chen2
1Department of Environmental Science and Engineering, Zhejiang Ocean University, No.1 Haida South Road, Zhoushan, 316022, PR China.
Journal of environmental management
|January 1, 2025
概括
低于0.41 mg/L的溶解氧 (DO) 对无氧氨氧化 (anammox) 总去除的影响最小. 较高的DO水平抑制了anammox活动,但一旦空气化停止,恢复是可能的.
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
- 生物地质化学循环的过程
背景情况:
- 无氧氨氧化 (anammox) 过程对于在废水处理中有效去除至关重要.
- 了解溶解氧 (DO) 对anammox细菌的影响对于优化治疗系统至关重要.
- 生物膜和颗粒式污泥是anammox工艺的常见配置,每一个都对环境因素具有潜在的不同敏感性.
研究的目的:
- 研究生物膜和颗粒性污泥在anammox反应堆中对不同水平的溶氧 (DO) 的抵抗机制.
- 为了确定不同DO度对anammox活性,微生物群落结构和细胞外聚合物质 (EPS) 生产的影响.
- 评估DO抑制对anammox工艺的可逆性及其对离子去除系统的影响.
主要方法:
- 建立和运行一个结合生物膜-颗粒污泥anammox反应堆.
- 反应堆暴露于不同水平的溶氧 (DO) (≤0.41 mg/L和1.96至2.08 mg/L).
- 监测总去除效率 (TNRE),特定的anammox活性,微生物群体组成 (包括Candidatus Kuenenia和Nitrospira),EPS含量和酸盐积累.
主要成果:
- 低的DO水平 (≤0.41 mg/L) 对总去除效率 (TNRE) 的影响最小.
- 高水平的DO (1.96-2.08 mg/L) 导致生物质分解,降低了anammox活性,在颗粒污泥中降低了EPS,但在生物膜中没有显著的降低.
- 高DO还降低了Candidatus Kuenenia的相对丰度,增加了Nitrospira,导致酸盐的积累;然而,这些影响在去除通风后是可逆的.
结论:
- 安纳莫克斯系统对低DO有一定的耐受性,但较高度对加工性能和微生物群落稳定性构成重大风险.
- 生物膜和颗粒型污泥对DO压力的反应不同,特别是关于EPS稳定性的反应.
- DO抑制的可逆性表明,在精心控制的条件下,可以将anammox与有氧过程结合起来.
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