期刊
BIODEGRADATION
卷 32, 期 5, 页码 595-610出版社
SPRINGER
DOI: 10.1007/s10532-021-09955-w
关键词
Sequencing batch biofilm reactor (SBBR); Microbial communities; Purification performance; Temperature variation; Potential functions
资金
- Open Research Program from the Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture [ZJK201902]
- CRSRI Open Research Program [SN: CKWV2019765/KY]
- Fundamental Research Funds for the Central Universities [WUT: 2019III107CG]
Temperature variation can significantly affect the purification performance of bioreactors by enhancing nutrient removal and influencing the composition and dominant species of microbial communities. Nitrifiers play a key role in the purification process, closely related to the severe lack of carbon sources in treated wastewater.
Generally, the purification performance of bioreactors could be influenced by temperature variation via shaping different microbial communities. However, the underlying mechanisms remain largely unknown. Here, the variation trends of microbial communities in three sequencing batch biofilm reactors (SBBRs) under four different temperatures (15, 20, 25, 30 degrees C) were compared. It was found that temperature increment led to an obvious enhancement in nutrient removal which was mainly occurred in the aerobic section. Meanwhile, distinct differences in dominant microbial communities or autotrophic nitrifiers were also observed. The performance of the SBBR reactors was closely associated with nitrifier communities since the treated wastewater was characterized by a severe lack of carbon sources (mean effluent COD <= 14.4 mg/L). Spearman correlation unraveled that: most of the differentiated microbes as well as the dominant potential functions were strongly associated with nutrient removal, indicating the temperature-induced difference in microbial community well explained the distinction in purification performance.
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