【摘要】 以人工湿地为研究对象,分析了不同C/N下人工湿地的脱氮效果。结果表明,C/N为10时,TN、NO-2-N和COD平均去除率分别为(75.36±10.55)%、(86.34±9.23)%和(67.60±4.10)%,都显著高于其他2组系统(p=0.006、0.001、0<0.01);随着C/N的增加,NO-3-N去除率呈现出上升的趋势;NH+4-N刚好相反,C/N为1时,明显要高于其他2种情况(p=0<0.05),平均去除率为(65.42±14.31)%。针对C/N为1时人工湿地脱氮效率较低(51.29±14.48)%的情况,对系统进水采取了添加一定量好氧反硝化细菌固定化小球并曝气12 h的强化实验措施。结果发现,强化实验条件下TN、NO-2-N和NO-3-N去除率均提高了10%以上,且都要明显高于非强化实验条件(p=0.003、0、0<0.01),同时NH+4-N和COD去除率没有明显差异,研究结果表明,从微生物角度对系统进水进行前处理有助于提高人工湿地脱氮效率。更多还原

【Abstract】 The aim of this study was to investigate the removal of nitrogen and the impact of different C /N in constructed wetland. Results indicated that the average removal competence of TN,NO-2-N,COD were( 75. 36± 10. 55) %,( 86. 34 ± 9. 23) % and( 67. 60 ± 4. 10) %,respectively,which were significantly higher than that of other two systems( p = 0. 006,0. 001,0 < 0. 01) when C / N was 10; with the increasing of C / N,the removal capability of NO-3-N presented a rising trends; while at C / N = 1,the average removal amount of NH+4-N was( 65. 42 ± 14. 31) %,showing the largest in those three different C / N( p = 0 < 0. 05). Targeting at the defect of lower nitrogen removal quantity at C / N = 1,an amplifying test was adopted which was adding some aerobic denitrification bacteria immobilized beads into influent and aerating for 12 h. And the experimental results showed that the removal capacity of TN,NO-2-N,NO-3-N increased by more than 10% and considerably higher than non-amplifying test( p = 0. 003,0,0 < 0. 01),but there were no apparent differences on NH+4-N and COD.From the aspect of microorganisms,the pre-treatment of influent contributed to the improvement of nitrogen removal ability in constructed wetlands.更多还原