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在ANAMMOX颗粒污泥中Ca2+粘附导致的较大的氧酸聚合是由高溶解氧气引起的

Mu Yuan¹, Qiu Shan², Mengqi Fu¹

¹School of Environment, Harbin Institute of Technology, Harbin, 150090, China.

|January 10, 2024

概括

溶解氧的波动改变无氧氨氧化 (ANAMMOX) 污泥,导致离子粘附,形成酸. 这影响了污泥形态和微生物群落,为防止污泥在废水处理中的恶化提供了一种策略.

科学领域:

环境科学环境科学
微生物学微生物学
生物技术是生物技术.

背景情况:

无氧氨氧化 (ANAMMOX) 是一个关键的可持续过程,用于从城市废水中去除 (NH₄⁺-N).
泥形态对于有效的ANAMMOX性能至关重要,但影响其稳定性的因素需要进一步调查.

研究的目的:

为了研究溶解氧 (DO) 波动对anammox颗粒污泥形态和组成的影响.
在不同的DO条件下识别污泥恶化背后的机制.
探索在ANAMMOX工艺中保持污泥稳定性的策略.

主要方法:

使用扫描电子显微镜 (SEM),数码相机成像,能量分散光谱仪 (EDS) 和X射线衍射 (XRD) 来描述污泥形态.
对细胞外聚合物物质 (EPS) 的分析,特别是蛋白质与多糖的比率 (PN/PS).
微生物群体分析以确定在不同DO暴露下的主导属.

主要成果:

交替溶解氧 (DO) 水平诱导离子 (Ca2+) 粘附于污泥表面,形成酸并改变污泥形态.
氧酸盐覆盖了原始污泥的孔隙,影响了其结构.
在氧气暴露下观察到PN/PS比率的下降,微生物群落发生了转移,norank_f_A4b和Nitrolancea在不同的时间点占主导地位.

结论:

由于离子粘附和氧酸盐的形成,DO的变化显著影响了anammox颗粒污泥的形态.
观察到的EPS和微生物群落的变化凸显了ANAMMOX对氧气水平的敏感性.
操纵DO和Ca2+度是一个可行的策略,以防止城市废水ANAMMOX系统中的污泥恶化.

关键词:

无氧氨氧化氧化无氧氨.离子是一种离子.溶解的氧气是一种溶解的氧气.细胞外聚合物质是细胞外的聚合物质.微生物社区结构是微生物的社区结构.

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