Sludge retention time affects the microbial community structure: A large-scale sampling of aeration tanks throughout China.
Sludge retention time affects the microbial community structure: A large-scale sampling of aeration tanks throughout China.
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污泥停留时间对微生物群落结构的影响：中国各地曝气池的大规模采样。
DOI：
10.1016/j.envpol.2020.114140
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发表时间：
2020-02
影响因子：
8.9
通讯作者：
Chenxiang Sun;Bing-Chang Zhang;Zhan Chen;Wentao Qin;X. Wen
中科院分区：
文献类型：
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作者：
Chenxiang Sun;Bing-Chang Zhang;Zhan Chen;Wentao Qin;X. Wen
活性污泥中微生物群落结构对污水处理厂曝气池的功能和稳定性具有重要影响。微生物群落结构受多种因素的影响，其中操作参数是影响其结构的关键因素。然而，作为曝气池的重要运行参数，污泥停留时间（SRT）对群落特性的影响机制尚不清楚。在这项研究中，通过高通量Illumina-MiSeq测序技术检测了48个在不同SRT条件下运行的全规模污水处理厂曝气池中的144个AS样品。结果表明，泥龄对曝气池微生物群落的多样性、组成、聚集和共生模式有显著影响。SRT为10-20 d的曝气池微生物群落生物多样性最高，随机过程影响最小，分子生态网络结构更稳定，丝状菌污泥膨胀风险最小，脱氮潜力增强。在此泥龄条件下运行，曝气池微生物群落更稳定，对扰动的适应能力更强。研究结果为从微生物群落角度优化曝气池提供了参考。
Microbial communities in activated sludge (AS) have a significant influence on the functions and stability of aeration tanks in wastewater treatment plants (WWTPs). The microbial community structure is affected by various factors, among which operational parameters outcompeted as the key factors in shaping its structure. However, as an important operational parameter of aeration tank, the mechanisms by which sludge retention time (SRT) affect community properties remain unclear. In this study, 144 AS samples from aeration tanks of 48 full-scale WWTPs operating under different SRT conditions were examined via high-throughput Illumina-MiSeq sequencing technology. The results indicated that SRT significantly affected the diversity, composition, assembly, and co-occurrence patterns of the microbial community in aeration tanks. Moreover, our results provided clear evidence that the microbial communities in aeration tanks operating under SRT of 10–20 days have the highest biodiversity, the lowest stochastic processes influence, the more stable molecular ecological network structure, the lowest risks of filamentous sludge bulking and enhanced nitrogen removal potential. The microbial communities could be more stable and resilient to disturbance when aeration tanks were operated under this SRT condition. The findings of this study provided a reference for the optimization of aeration tanks from an of microbial community perspective.