A^2/O生物同步脱氮除磷及其改良工艺进展

Development of A^2/O processes for phosphorus and nitrogen removal

介绍了污水处理中传统的A2/O工艺,该工艺具有在消减COD的同时有效脱氮除磷的优势,因而得到广泛应用。同时,对该工艺固有的一些弊端进行了分析,针对工艺中三类主要微生物:硝化菌、反硝化菌、聚磷菌竞争碳源、世代生长时间不同、食荷比要求不同的内在矛盾,列举了一些针对硝酸盐干扰释磷,碳源不足影响反硝化等的解决措施,并阐述了当前脱氮除磷工艺的最新研究进展。

The conventional anaerobic-anoxic-aerobic wastewater treatment method（A2/O） is a prevailing process due to its capability of degrading COD,N,and P in one process.The characteristics,advantages and disadvantages of A2/O method is analysed.And the detailed analysis of the problems associated with the conventional A2/O process,especially in the aspect of nitrogen and phosphorus removal is also presented.The typical problems include the inherent shortcomings in organic loading,the complicating demands for carbon source and sludge retention time for nitrifying bacteria,denitrifying bacteria and poly-phosphate accumulating bacteria.Accordingly,various countermeasures can be taken and are analyzed briefly to solve the nitrate interfering with phosphorus release and the lack of carbon sources for denitrification.The latest progresses in nitrogen and phosphorus removal processes based on the conventional ones are also summarized briefly,especially the two-sludge system and those utilizing denitrifying phosphorus removal bacteria.