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 °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.

通常，通过塑造不同的微生物群落，温度变化会影响生物反应器的净化性能。然而，潜在的机制在很大程度上仍然未知。在这里，比较了三种测序批次生物膜反应器（SBBR）在四种不同温度（15、20、25、30°C）下微生物群落的变化趋势。发现温度升高导致养分去除明显增强，主要发生在好氧段。同时，还观察到优势微生物群落或自养硝化菌的明显差异。SBBR 反应器的性能与硝化菌群落密切相关，因为处理后的废水的特点是严重缺乏碳源（平均出水 COD ≤ 14.4 mg/L）。