关键词: AmOn反应器, 脱氮除磷, CFD技术, 优化设计

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