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城市污水脱氮除磷处理工艺一般分为A~2/O法、氧化沟法和SBR法三大类。以A~2/O法为主流工艺。随着技术的进步,三人类工艺均在不断发展和改进之中,氧化沟法出现了三沟式、DE型、DT型、卡鲁塞尔2000型(甚至3000型)等,SBR法出现了ICEAS法、CASS法、Unitank法和MSBR法等。和氧化沟法、SBR法工艺的不断革新相比,A~2/O法似乎较为保守,变化不大。实际上A~2/O法也在不断发展,特别是近十年来出现了许多改良型A~2/O工艺有的已经在工程上成功应用。本文对这些改良型A~2/O工艺进行系统综述,并推荐了其中两种适合我国城市污水水质的良型工艺。
Urban sewage nitrogen and phosphorus removal process is generally divided into A ~ 2 / O method, oxidation ditch and SBR three categories. A ~ 2 / O method for the mainstream technology. With the progress of technology, all three human processes are under continuous development and improvement. There are three grooves, DE type, DT type and Carrousel 2000 type (even 3000 type) in the oxidation ditch method. The SBR method appears ICEAS method, CASS method, Unitank method and MSBR method. Compared with oxidation ditch method and SBR method, the A ~ 2 / O method seems to be more conservative and has little change. In fact, A ~ 2 / O method is also evolving, especially in the last decade many modified A ~ 2 / O processes have been successfully applied in engineering. This paper systematically reviews these modified A ~ 2 / O processes, and recommends two of them, which are suitable for the urban sewage water quality in China.