中文摘要：

城市污水和工业废水的氧化沟生物处理技术已经被全世界广泛采用.曝气机是污水生化处理技术中的一种关键设备,它影响治理效率、能源消耗和氧化沟的稳定.它的主要作用是氧化、混合以及推流.其中混合叶片的最优化设计对氧化效率的提高最为重要.提出了一种新的曝气机设计,并且通过实体建模,网格划分,有限元分析对曝气机的工作过程进行了研究,并最终提出了加入约束后的有限元分析过程,通过它找到了叶片中最脆弱的部分,并提出了一种高效最优的方案.

英文摘要：

Oxidation ditch process for sewage and industrial wastewater treatment of city has been widely adopted around the world. The inverted umbrella aerator is the key equipment of biological wastewater treatment techmdogy, which has an impact on treatment efficiency, energy consumption and stability of oxidation ditch. And it has the effects of oxygenation, mixing and plug-flow. The design and optimization of the mixing impeller is most important to the efficiency of oxygenation. A new aerator with curve blades was presented, and more, the working process of the blades have been studied through solid modeling, mesh generation and finite element analysis process, and the stress-strain finite element analysis was offered, which identified the weak links in the leaves and put forwacd the effective optimal measures.