To investigate the effect of Tetrasphaera’s enrichment on phosphorus removal mechanism, three micro-pressure swirl reactor (MPSR) groups were used to experiment on sewage treatment under different SRT (17.2, 50.8, and 68.2 d). Results showed that Tetrasphaera enrichment in the MPSR system was promoted by extending the SRT. After extending the SRT from 17.2 to 68.2 d, the relative abundance of Tetrasphaera increased from 3.1% to 12.1%, and the TP removal efficiency maintained above 92%. The internal circulation results indicated that after extending the SRT, glycogen and polyhydroxybutyrate were co-synthesized during the anaerobic stage, which enhanced the driving force of nutrient removal. Analysis of the microbial composition and functional gene prediction indicated that efficient phosphorus removal can be attributed to the enrichment of Tetrasphaera at long SRT. Overall, the synergistic mechanisms of Tetrasphaera in the organic matter degradation and phosphorus removal processes were integrated into the MPSR.

为了研究四球藻富集对除磷机理的影响，采用三组微压旋流反应器（MPSR）组进行不同SRT（17.2、50.8和68.2 d）下的污水处理实验。结果表明，延长 SRT 可以促进 MPSR 系统中Tetrasphaera 的富集。 SRT从17.2 d延长至68.2 d后，四球菌相对丰度从3.1%增加至12.1%，TP去除率保持在92%以上。内循环结果表明，延长SRT后，糖原和聚羟基丁酸在无氧阶段共合成，增强了营养物去除的驱动力。微生物组成分析和功能基因预测表明，有效除磷可归因于长SRT下四球菌的富集。总体而言，四球菌在有机物降解和除磷过程中的协同机制被整合到MPSR中。