A^2O-MBR工艺脱氮除磷的性能及稳定性

PERFORMANCE AND STABILITY OF NITROGEN AND PHOSPHORUS REMOVAL BY A^2O-MBR PROCESS

使用A2O-MBR工艺处理人工合成的污水,并考察了该工艺对污水中COD、NH4+-N、总氮和PO43--P的去除效果,同时也研究了污泥的形态及变化。结果显示,该系统对COD、NH4+-N、总氮和PO43--P的去除率分别达到95%、98%、68%和70%左右,出水中NO2--N和NO3--N含量平均分别为0.4、4 mg/L。显微镜的观察结果显示,活性污泥部分已经呈现颗粒化状态,且污泥中含有大量细菌和原生动物等微生物。研究揭示出使用A2O-MBR工艺处理污水,出水水质比较稳定,运行状态良好。

The anaerobic-anoxic-oxic and membrane bioreactor （A2O-MBR） system was used to treat the synthetic wastewater. Water quality and sludge morphology was also investigated in the system. The results showed that the removal efficiency of COD, NH4^＋-N, TN, and PO4^3--P were 95%, 98%, 68%, and 70%, respectively. In addition, the average concentrations of NOE-N and NO3-N in effluent were correspondingly 0.4 and 4 mg/L. Microscopy images revealed granular sludge was gradually formed from activated sludge, and a lot of microorganisms such as bacteria and protozoa lived in the sludge. The study demonstrates that A^2O-MBR process can be successfully operated, and the water quality ofeffiuent is stable.