新型PD/A工艺同步处理低C/N生活原水和二级出水

通过一种新型的短程反硝化-厌氧氨氧化（Partial Denitrification/Anammox，PD/A）固定生物膜工艺，同步处理模拟的低C/N城市污水厂生活原水和二级出水，研究了不同进水C/N（1.3，1.5，1.6，1.8）和不同pH值（7.5，8.0，8.5，9.0）下该工艺的脱氮效果.结果表明，逐步提高进水C/N强化了系统的完全反硝化作用，平均NO₃^--N去除率从52.3%增长至85.7%；较高的进水pH值促进了短程反硝化过程中NO₂^--N的积累，继而强化了厌氧氨氧化的自养脱氮作用，平均NH₄⁺-N去除率从82.2%增长至89.7%.在C/N=1.6、pH=9.0的条件下，该工艺达到了88.3%的TN去除率，出水TN稳定低于2mg/L.此外，分析了PD/A固定生物膜工艺在传统AAO工艺升级改造中的潜力.

NovelPD/A processtotreat low C/N domestic wastewater and secondary effluent simultaneously

Anovelfixed-bed biofilm process based on partial denitrification/anammox (PD/A) was developed for the simultaneous treatment of low C/N domestic wastewater and secondary effluent. The nitrogen removal performance of the process at different influent C/N (1.3, 1.5, 1.6, 1.8) and different pH (7.5, 8.0, 8.5, 9.0) was studied. Results showed that increasing influent C/N enhanced the complete denitrification of the system, whichincreased the average removal rate of NO₃^--N from 52.3% to 85.7%; The higher influent pH promoted theNO₂^--N accumulation in partial-denitrification process, and then enhanced the autotrophic nitrogen removal by the anammox, which increased the average removal rate of NH₄⁺-N from 82.2% to 89.7%. Under the conditions of C/N=1.6 and pH=9.0, 88.3% of TN removal rate was achieved, and the effluent TN was stable less than 2mg/L. Moreover, the potential of the fixed-bed biofilm process based on PD/Ain the upgrading of traditional AAO process was analyzed.