缺氧区、好氧区容积比对A2/O工艺反硝化除磷的影响

反硝化除磷菌可以在碳源不足的条件下,通过"一碳两用"的方式同时实现反硝化脱氮和吸磷过程,有研究表明,A2/O工艺中存在反硝化除磷现象.为此以啤酒废水为处理对象,研究了缺氧区与好氧区容积比对A2/O工艺反硝化除磷的影响.试验结果表明,在缺氧区与好氧区容积比分别为0.33、0.48、0.60的条件下,A2/O系统对总氮的平均去除率分别为68.04%、79.64%和85.70%,对总磷的平均去除率分别为85.38%、90.80%和96.84%,对COD的去除率均在90%以上.此外,如果继续增大缺氧区与好氧区容积比,应适当调整内循环比,否则会由于缺氧区硝酸盐浓度不够而发生二次释磷现象.

Influence of Volume Ratio of Anoxic Zone to Aerobic Zone on Denitrifying Phosphorus Removal in A2/O Process

Under the condition of insufficient carbon source,denitrifying phosphorus removal bacteria can utilize nitrate as the electron acceptor to take up phosphorus by single carbon source.It is confirmed that denitrifying phosphorus removal bacteria exist in A2/O process.Therefore,the influence of the volume ratios of anoxic zone to aerobic zone on denitrifying phosphorus removal in the A2/O process for treating brewery wastewater was studied.The results show that when the volume ratios of anoxic zone to aerobic zone are 0.33,0.48 and 0.60,the resulting average total nitrogen removal efficiencies are 68.04%,79.64% and 85.70%,the average phosphorus removal efficiencies are 85.38%,90.80% and 96.84%,respectively.Also,the average COD removal efficiencies under the three ratios are all higher than 90%.Therefore,when the volume ratios of anoxic zone to aerobic zone continue to be increased,internal recirculation ratio shall be adjusted,otherwise the nitrate concentration will not be enough in anoxic zone and phosphorus will be released again.