氧化沟脱氮除磷强化途径

针对氧化沟脱氮除磷过程特点,分析了氧化沟脱氮除磷强化过程,探讨了氧化沟脱氮除磷适宜环境条件,从如下四个方面提出了改善氧化沟脱氮除磷性能的途径和方法:(1)安排合适的曝气器、进水口、出水口、回流口位置,将氧化沟反应区段构建成倒置A2/O脱氮除磷工艺;(2)将氧化沟设计成立面水流循环的形式,尽可能在沟渠内构建一个较严格的厌氧区段;(3)确定适当的供氧量,避免供氧量不足造成氨氮硝化与吸磷不充分;避免供氧过度导致碳源被大量消耗影响反硝化、溶解氧浓度偏高影响厌氧释磷;(4)确定适宜的氧化沟水力工作条件、供氧方式。

Approach to the Enhancement of Removal of Phosphorus and Nitrogen in Oxidation Ditch

In response to the characteristic of oxidation ditch and its limitation in removal of phosphorus and nitrogen,the research of the biological phosphorus and nitrogen removal in micro-environment and macroenvironment was reviewed.The process of enhancing phosphorus and nitrogen removal was discussed,the way to improve the phosphorus and nitrogen removal was presented:(1)the proper sequential arrangement of the locations of aerator,influent,effluent and return sludge to form the reversed A~2/O process;(2)forming more rigorously anaerobic zone by means of vertical flow circle;(3)the proper supply of oxygen,to avoid insufficiency of aerobic phosphorus uptake and nitrification with low oxygen supply;While to keep from overmuch waste of carbon source going against de-nitrification,and high oxygen concentration going against anaerobic phosphorus release due to high oxygen supply;(4)the proper hydraulic parameter and oxygen supply mode.