关键词: A/O法, 生物脱氮, 摇动床反应器, 硝化液回流比, 进水负荷

Abstract: The swim-bed technology is an innovative and highly efficient wastewater treatment process developed by Networking of Engineering and Textile Processing Limited Corporation,Japan.The technology uses a novel biofringe attachment material, which allows for attachment of large amount of biomass on a flexible matrix in a fixed position. By this approach, flexing of the matrix induced by wastewater flow creates a swimming motion, which enhances mass transfer and improves the activity of the biomass. In this paper biological nitrogen removal from petrochemical wastewater was investigated by using an anoxic-oxic swim-bed reactor. The study result showed that good biological nitrogen removal was achieved in the reactor. The influence of mixed liquid recycle ratio and influent load on biological nitrogen removal was discussed. When mixed liquid recycle ratio,influent COD concentration and NH⁺₄-N concentration were 2.5, 400～600 mg•L^-1 and 20～40 mg•L^-1 respectively,the concentration of COD, NH⁺₄-N and TN in the outlet were lower than 40 mg•L^-1, 1.0 mg•L^-1 and 7.0 mg•L^-1 respectively, and COD removal efficiency, nitrification rate and denitrification rate were 90%, 95% and 70% respectively.

Key words: A/O法, 生物脱氮, 摇动床反应器, 硝化液回流比, 进水负荷