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Core activated sludge communities are influenced little by immigration:Case study of a membrane bioreactor plant

Journal of Environmental Sciences 2021年第4期33卷 244-255页

作者： Shaoqing Zhang Fangang Meng School of Civil Engineering Guangzhou UniversityGuangzhou 510006China School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen UniversityGuangzhou 510275China

Microbial immigrants arriving with influent wastewater may influence activated sludge(AS)***,the extent to which immigration impacts AS communities is still *** explore the intensity of immigration impact,we used sequencing technology to track the raw wastewater and AS communities from a membrane bioreactor plant over a 12-month *** first distinguished core populations from peripheral ones in both raw wastewater and AS based on their occurrence frequency and *** results showed that core OTUs(≥80%occurrence frequency)made up a large fraction(>90%)of total sequences,while peripheral OTUs composed the majority of all detected OTUs but merely occupied a few sequences.A significant difference in core communities between the influent and AS was found,as well as between the compositions of core and peripheral ***,the persistent functional bacteria of AS,although not numerically dominant,accounted for 96.24%of the total sequences related to nutrient turnover,suggesting the presence of a small number of longstanding and core functional bacteria in the AS ***,64%of the 5188 OTUs in AS,which accounted for 91.51%of the sequences,exhibited positive growth rates,which suggested that their apparent abundances were due to growth within the plant,not from *** together,these results demonstrated that the impact of influent populations on core AS communities was ***,this work provides quantitative insights into the impact of immigration,which is expected to advance our understanding of the AS community assembly.

关键词： Membrane bioreactor Activated sludge Core community active population Immigration impact

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