This study aims to investigate the impact of the aerator position on the dissolved oxygen spatial distribution and stability of aerobic granular sludge (AGS). Three SBRs with 2.5 mm mesh screen were established under condition of different aerator positions, the aerators of R1, R2 and R3 were set at the bottom, 1/6 and 1/3 height of reactors, respectively. The results revealed that R2 was more favorable to improve the sludge settling behavior and structural stability of AGS, resulting in 83.7 ± 1.4 % of total nitrogen (TN) removal. However, R3 led to an anoxic environment at the bottom of reactor, which prevented the formation of AGS and made a large amount of sludge lost. DO distribution indicated that oxygen content at the bottom of R2 was at the optimum range of 18.9 %–20.1 %, being beneficial to realize the simultaneous nitrification-denitrification. Therefore, the functional microbes of Zoogloea spp. (17.4 %), Paracoccus spp. (12.5 %), Thaurea spp. (13.6 %) and Rhodobacter spp. (10.8 %) were highly enriched in R2. Overall, raising the aerator position to 1/6 height of reactor led to 7.4 % increase of TN removal efficiency and 15.4 % decrease of energy consumption, which favors the application of AGS technology.

本研究旨在探讨曝气器位置对好氧颗粒污泥（AGS）溶解氧空间分布和稳定性的影响。在曝气器位置不同的条件下，建立了3个2.5 mm筛网的SBR，曝气器R1、R2和R3分别设置在反应器底部、1/6和1/3高度处。结果表明，R2 更有利于改善 AGS 的污泥沉降行为和结构稳定性，可去除 83.7 ± 1.4 % 的总氮 (TN)。然而，R3导致反应器底部缺氧环境，阻止了AGS的形成，使大量污泥流失。DO分布表明R2底部的氧含量在18.9 %~20.1 %的最佳范围内，有利于实现同时硝化反硝化。因此，功能性微生物Zoogloea spp。(17.4 %)，副球菌属。(12.5 %) , Thaurea spp. (13.6 %) 和红杆菌属。(10.8%) R2 高度富集。总体而言，将曝气器位置提高到反应器高度的1/6，TN去除效率提高7.4%，能耗降低15.4%，有利于AGS技术的应用。