高氨氮浓度下改良型倒置A~2/O工艺的脱氮性能研究

针对高氨氮生活污水,设计了一种新型的脱氮除磷工艺。该工艺是对传统倒置A~2/O工艺的改进,它采用了后置预缺氧区以提高系统的脱氮效果。试验探讨了工艺关键因素与脱氮效果的相关性。试验表明水力停留时间为25 h,内回流比为200%,DO浓度在2 mg/L时,对NH_3-N、TN、TP的去除率分别可达96.17%、73.83%和92.38%。

Research of Nitrogen Removal from the Wastewater with High Ammonia-nitrogen Concentration by Modified Reversed A2/O Process

In this research,with regard to the domestic wastewater with high concentration of ammonia nitrogen,a new nitrogen and phosphorus removal process was designed.This modified reversed A2/O process was improved from the traditional A2/O technology by application of a postposition preliminary anoxic zone to enhance the nitrogen removal of the system.Correlation between the key process factors and the removal rate of nitrogen was discussed.The experiment results showed that when HRT was 25 h,reflux ratio was 200％ and DO was 2 nag/L,the removal rate of NH3-N,TN and TP was 96.17％,73.83％ and 92.38％ respectively.