Abstract: The new AmOn bioreactor based on the principle of airlift loop reactor, was designed to have the function of both traditional oxidation ditch and secondary sedimentation basin, which collected the process of organic matter removal, denitrification nutrients removal, sludge return and mud-water separation in one reactor. Aeration device was the core part of this reactor, which could not only supply oxygen demand and turbulence in mass transfer, but also provide the impetus for the liquid vertical flow in the whole reactor. By means of CFD technology, this paper analyzed the influence on the treatment effect and turbulence in mass transfer in different flow field, through the comparison of the simulating flow field information in oxidation zoon before change and after. Experiments showed that the middle aerator pipe at the two pipes condition destroyed the cycle eddy at the single pipe condition, which made the liquid velocity and gas hold-up more uniform and reasonable. The oxidation zoon was more conductive to gas-liquid and liquid-solid mass transfer, and the sewage treatment effect would be much enforced in the same aeration condition.

Key words: AmOn bioreactor, nitrogen and phosphorus removal, CFD technology, optimization design

摘要： 基于气升式环流反应器原理设计的新型AnOn反应器，是集传统氧化沟和二沉池工艺于一体，同时实现有机物去除、反硝化脱氮除磷、污泥回流以及泥水分离等功能的高效污水处理生化反应器。曝气装置是该反应器的核心部件，不但起到曝气充氧、紊动传质的作用，而且还是整个反应器内液相垂直流动的动力来源。本文借助CFD技术，对好氧区曝气方式改进前后流场特征进行模拟，分析不同流场情况对好氧区紊动传质及处理效果的影响。实验表明，双管曝气方式下，中间一道曝气管的曝气搅拌作用破坏了单管曝气方式下的循环涡流，使得液速和气含率分布更加均匀合理，好氧区流场更加有利于气液和液固传质，相同曝气量条件下污水处理效果得到很大加强。

关键词: AmOn反应器, 脱氮除磷, CFD技术, 优化设计