同步硝化反硝化耦合除磷工艺的快速启动及其运行特征

以低COD/N生活污水(C/N为3∶1~4∶1)为进水基质,在序批式活性污泥反应器(SBR)中接种好氧颗粒污泥(AGS),通过逐步降低溶解氧(DO)浓度的方式快速实现同步硝化反硝化耦合除磷.反应器运行20 d后(DO浓度为0.50~1.0mg·L-1),系统出现同步硝化反硝化耦合除磷的现象.在随后运行的40 d里,反应器对废水COD、NH+4-N、TN和TP的平均去除率分别为84.84%、93.51%、77.06%和85.69%;出水NO-3-N和NO-2-N平均浓度分别为4.01 mg·L-1和3.17 mg·L-1.反应器启动运行后期,污泥体积指数(SVI)为55.22 m L·g-1,沉降性能良好,颗粒结构较完整.不同氮源的周期曝气阶段结果表明,对TN的去除率为NH+4-NNO-2-NNO-3-N;对TP的去除率为NO-3-NNO-2-NNH+4-N,反应器主要以同步硝化反硝化脱氮和反硝化方式除磷.

Rapid Start-up of Simultaneous Nitrification and Denitrification Coupled Phosphorus Removal Process and Its Performing Characteristics

In this study, simultaneous nitrification and denitrification(SND) coupled Phosphorus removal process through gradually decreasing DO concentration was investigated by treating wastewater with a low COD/TN ratio (C/N=3 :1-4 :1) in a sequencing batch reactor (SBR) inoculated with aerobic granular sludge(AGS). Successful SND coupled Phosphorus phenomenon occurred after 20d at the DO concentration of 0.50-1.0 mg ·L^-1. In the following 40 days, the average removal rates of COD, NH₄⁺-N, TN and TP were 84.84%, 93.51%, 77.06% and 85.69%,and the NO₃^--N and NO₂^--N average accumulations in the effluent were only 4.01 mg ·L^-1 and 3.17 mg ·L^-1, respectively. The AGS had complete forms and good settling performances, and the sludge volume index (SVI) was about 55.22 mL ·g^-1 at the end of starting-up stage. The results of different nitrogen sources showed that the removal rate of TN was in the order of NH₄⁺-N>NO₂^--N>NO₃^--N, and the removal rate of TP was in the order of NO₃^--N >NO₂^--N >NH₄⁺-N. The nitrogen and phosphorus removal of wastewater were mainly realized by simultaneous nitrification and denitrification and denitrifying phosphorus removal, respectively.