• 关键词：A²O工艺  反硝化除磷  内循环比  体积比  旁流比

• 基金项目：国家自然科学基金-国际(地区)重大合作项目(No.50521140075);国家自然科学基金(No.20377003);北京市重点实验室开放基金

• 王晓莲
• 北京工业大学, 北京市水质科学与水环境恢复工程重点实验室, 北京 100022

• 王淑莹
• 北京工业大学, 北京市水质科学与水环境恢复工程重点实验室, 北京 100022

• 王亚宜
• 浙江工业大学建筑工程学院, 杭州 310014

• 彭永臻
• 北京工业大学, 北京市水质科学与水环境恢复工程重点实验室, 北京 100022

• 摘要：以啤酒废水为研究对象,重点考察了如何强化A²/O工艺反硝化除磷性能,从而提高营养物去除效果、并实现节能的目的.试验中建立了3种运行控制策略:(1)根据缺氧区末端出水硝酸盐的浓度控制内循环回流量;(2)调节厌氧/缺氧/好氧区体积比以减少厌氧区出水剩余COD对缺氧磷吸收的影响;(3)向缺氧区引入旁流并调节旁流比.试验结果表明,当缺氧区末端出水硝酸盐浓度控制在1～3mg·L^-1时,不仅可强化反硝化除磷效果,而且可以节省内循环所需能耗;厌氧/缺氧/好氧区最佳体积比为1/1/2;旁流的引入可以提高低C/N比条件下TN的去除,最优旁流比为0.32.

• Abstract：The lab-scale anaerobic-anoxic-oxic (A²/O) process for treating brewage wastewater was investigated for one year. The aims of this work were to improve nutrient removal efficiency and save energy by enhancing denitrifying phosphorus removal performance of A²/O system. Three kinds of operational strategies were proposed and investigated, i.e. (1) controlling nitrate recirculation flow rate; (2) adjusting the volume ratio of anaerobic /anoxic/oxic zone; (3) introducing bypass flow into anoxic zone and redistributing the bypass flow ratio. The results showed that not only anoxic P uptake could be stimulated but also recirculation energy consumption could be saved when anoxic effluent NO₃^--N concentration was controlled between 1～3 mg·L^-1 ; the optimal volume ratio of anaerobic /anoxic/aerobic zone in this system was 1/1/2; The TN removal efficiency could be improved significantly through the introduction bypass flow even if at low C/N ratio, the optimal value of bypass flow ratio was 0.32.

• Key words：A²/O process  denitrifying phosphorus removal  nitrate recirculation ratio  the volume ratio  bypass flow ratio

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