一种基于DEAMOX污泥双回流AOAO污水深度脱氮除磷的装置与方法

一种基于DEAMOX污泥双回流AOAO污水深度脱氮除磷的装置与方法属于市政污水生物领域。生活污水和二沉池的回流污泥进入AOAO反应器的厌氧区，首先反硝化菌进行短程反硝化，将回流污泥中的硝态氮还原为亚硝态氮，然后厌氧氨氧化菌将氨氮和亚硝态氮转化为氮气，而后聚磷菌与反硝化聚磷菌厌氧释磷并贮存内碳源；随后部分混合液进入AOAO反应器的中间好氧区，进行吸磷和硝化反应，另一部分混合液进入AOAO反应器的缺氧区，与此同时中间好氧区的全部混合液与二沉池部分回流污泥进入缺氧区，利用污泥厌氧段贮存的内碳源与回流污泥中的内碳源发生短程反硝化、厌氧氨氧化、反硝化除磷，然后混合液进入后置好氧区，随后进入二沉池进行泥水分离。本发明实现深度脱氮除磷。 A method for advanced nitrogen and phosphorus removal of domestic sewage based on DEAMOX in AOAO process with sludge double-reflux is disclosed. The method comprises allowing domestic sewage and returned sludge of the secondary sedimentation tank (3) to enter the anaerobic zone (2.1) of the AOAO reactor (2), firstly performing partial denitrification by the denitrifying bacteria, reducing nitrate-nitrogen in the returned sludge to nitrite-nitrogen, then converting ammonia-nitrogen and nitrite-nitrogen into nitrogen by anammox bacteria, and phosphate accumulating bacteria and denitrifying phosphate accumulating organisms performing anaerobic phosphate release and storing internal carbon source; then