【摘要】 利用4个连续进水的垂直流人工湿地,比较分析水位对污染物去除效果的影响,研究湿地中植物对氮磷去除的贡献,阐析湿地中脱氮功能菌数量的演变规律。3个湿地栽种黄花鸢尾,水位分别控制在19、51和84cm,另一个湿地不栽种植物,水位为51cm。结果表明,水位对氮和有机物的去除有显著影响(p<0.05),栽种植物的湿地中,51cm水位时总氮去除率(67.4%～79.2%)最高,19cm水位时氨氮(85.3%～93.0%)和COD(81.8%～92.9%)去除效果最好。试验中黄花鸢尾均生长良好,植物吸收对总氮(Total nitrogen,简称TN)和总磷(Total phosphorus,简称TP)去除的贡献分别为19.2%～27.3%和14.7%～19.2%;植物地上部分发挥更重要作用,其TN和TP含量及对TN和TP的吸收量均高于地下部分。湿地表层基质中3种脱氮功能菌数量均随运行时间的增加而显著提高,亚硝化细菌和硝化细菌数量分别为10~4～10~6和10~5～10~7 MPN/g,随水位升高而减少;反硝化细菌数量为10~3～10~6 MPN/g,随水位升高而增加。更多还原

【Abstract】 The aim of this study is to analyze the effect of water level on the removal of nitrogen and organic,investigate the plant contributions for TN and TP removal,and explain the variation of nitrogen transformation microorganism in four continuous-feed vertical flow constructed wetlands(VFCWs).Three VFCWs were planted with Iris pseudacorus and operated with different water levels(19,51 and84 cm),and the other one was non-planted with 51 cm water level.The results indicated that the removal efficiency of nitrogen and organic were significantly different among four VFCWs(p<0.05).The planted wetland with 51 cm water level achieved the best TN removal efficiency of 67.4%～79.2%,and the highest removal efficiencies of NH+4-N(85.3% ～93.0%)and COD(81.8% ～92.9%)were observed in the wetland with 19 cm water level.The Iris pseudacorus grew well and showed potential for enhancing nutrient purification in VFCWs with three different water levels.Plant uptake accounted for19.2%～27.3% of TN and 14.7%～19.2%of TP removed in the VFCW systems.TN and TP contents(19.8～22.8 and 1.5～1.8 mg/g)and TN and TP uptake by plants(33.2～52.9 and 2.6～4.7 mg/m2·d)in above-ground tissue were significantly higher than those in below-ground tissue,which indicated that the above-ground portion played a more significant role in plant uptake.The nitrogen transformation microbial population of surface layer significantly increased with domestication and cultivation in the VFCWs.The populations of nitrosobacteria and nitrobacteria(10~4～10~6 and 10~5～10~7 MPN/g)reduced with the increasing water level,while the denitrifying bacteria(10~3～10~6 MPN/g)increased.更多还原