针对目前厌氧-缺氧-好氧（anaerobic-anoxic-oxic, A²/O）工艺能耗较高、好氧池氧利用率有待改善及污泥易发生沉积、老化等问题，对一体化污水处理装置的好氧池结构进行了优化设计。在相同曝气强度下，对比研究了微压内循环与普通好氧池的氧传质特性，并分析了内流场特性；装置稳定运行后，探究了水力停留时间（hydraulic retention time, HRT）和气提回流比对出水水质的影响。结果表明：在相同曝气强度下，微压内循环好氧池的氧总转移系数K_La（20）约为普通好氧池的1.16倍，且氧转移效率E_O2提升超10%，明显提高了氧传质速率和利用效率，有利于降低能耗；液相速度、涡量分布及大尺度旋涡结构的分析进一步证明，微压内循环结构能优化氧利用率，改善泥沉积问题，提升水处理效率；在HRT为14 h和气提回流比为250%的条件下，一体化装置具有良好抗冲击性能，对化学需氧量（chemical oxygen demand, COD）、总氮（total nitrogen, TN）、总磷（total phosphorus, TP）的平均去除率分别为91.02%、79.31%、77.77%，平均出水COD与TN浓度符合《城镇污水处理厂污染物排放标准》（GB 18918—2002）一级A标准，TP浓度达到一级B标准。该研究为污水处理氧传质强化、降本增效提供了新思路。

To address the issues of high energy consumption, suboptimal oxygen utilization in the aerobic tanks, and sludge sedimentation and aging in current anaerobic-anoxic-oxic (A²/O) processes, the aerobic tank structure of the integrated sewage treatment device was optimized. Under the same aeration intensity, the oxygen mass transfer characteristics between micro-pressure internal circulation and conventional aerobic tanks were comparatively studied, and the internal flow field characteristics were analyzed. After stable operation of the unit, the effects of hydraulic retention time(HRT) and air-lift reflux ratio on effluent quality were investigated. Results showed that under the same aeration intensity, the total oxygen transfer coefficient K_La(20) of the micro-pressure internal circulation aerobic tank is approximately 1.16 times that of the conventional aerobic tank. The oxygen transfer efficiency (E_O2) is increased by over 10%, whereby the oxygen mass transfer rate and utilization efficiency are significantly improved, and energy consumption is reduced. Analysis of liquid phase velocity, vorticity distribution, and large-scale vortex structures further demonstrate that the micro-pressure internal circulation structure could optimize oxygen utilization, improve sludge sedimentation issues, and enhance water treatment efficiency. Under the conditions of HRT of 14 h and stripping reflux ratio of 250%, the integrated unit has good shock resistance performance and is suitable for chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (total phosphorus). The average removal rates of TP are 91.02%, 79.31%, and 77.77% respectively. The average effluent COD and TN concentrations met the first-level A standard of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants (GB 18918—2002), and the TP concentration reached the first-level B standard. This research provides new ideas for enhancing oxygen mass transfer and reducing costs while improving efficiency in sewage treatment.