针对某污水厂改良型Carrousel氧化沟工艺运行中全氮去除率较低的工况，研究了溶氧浓度、C/N比、污泥龄、污泥回流比、温度等因素对其同步脱氮的影响，提出优化运行方案. 结果表明，优化方案为根据相应位点溶氧浓度变化调控表曝机输出功率，降低系统能耗；改厌氧区单点进水为厌氧区、前置缺氧区双点进水，提高缺氧区C/N比. 改造后，系统对COD, BOD5, NH4+?N去除效果稳定，全氮去除率从56.25%提高到68.80%.

One problem of improved carrousel oxidation ditch of a sewage plant is the lower total nitrogen removal rate. Two solutions are put forward after analyzing the factors such as dissolved oxygen, C/N, sludge retention time, sludge return ratio and temperature. The results showed that power output of aerator is adjusted in accordance with the change of dissolved oxygen concentration monitoring in the corresponding site, which can also reduce energy consumption of the system. C/N of the anoxic zone is increased by adding one site of influent in anoxic zone. After reconstruction, the COD, BOD5 and NH4+?N of effluent are stable, and the total nitrogen removal rate is significantly increased from 56.25% to 68.80%.