| 同步硝化反硝化耦合除磷工艺的快速启动及其运行特征 |
| 摘要点击 3236 全文点击 1885 投稿时间：2015-05-18 修订日期：2015-06-19 |
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| 中文关键词 好氧颗粒污泥 同步硝化反硝化 除磷 低COD/N 溶解氧 |
| 英文关键词 aerobic granular sludge simultaneous nitrification and denitrification(SND) phosphorus removal low COD/N ratio dissolved oxygen |
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| 中文摘要 |
| 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0.50~1.0 mg ·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、 NH4+-N、 TN和TP的平均去除率分别为84.84%、 93.51%、 77.06%和85.69%; 出水NO3--N和NO2--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 mL ·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NH4+-N>NO2--N >NO3--N; 对TP的去除率为 NO3--N >NO2--N >NH4+-N,反应器主要以同步硝化反硝化脱氮和反硝化方式除磷. |
| 英文摘要 |
| 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. |
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