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84 cm ,另一个湿地不栽种植物,水位为51 cm .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,51 cm水位时总氮去除率(67?4% ~79?2%)最高,19 cm 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 T N )和总磷(Total phosphorus ,简称 T P)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 T N和 T P含量及对 T N和 T P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104 ~106和105 ~107 M PN/g ,随水位升高而减少;反硝化细菌数量为103 ~106 M PN/g ,随水位升高而增加.
The aim of this study is to analyze the effect of water level on the removal of nitrogen and or‐ganic ,investigate the plant contributions for T N and T P removal ,and explain the variation of nitrogen transformation microorganism in four continuous‐feed vertical flow constructed w etlands (V FCWs ). T hree VFCWs were planted with I ris pseudacorus and operated with different water levels (19 ,51 and 84 cm ) ,and the other one w as non‐planted w ith 51 cm w ater level .T he results indicated that the re‐moval efficiency of nitrogen and organic w ere significantly different among four V FCWs (p<0?05).T he planted w etland w ith 51 cm w ater level achieved the best T N removal efficiency of 67?4% ~79?2%,and the highest removal efficiencies of N H +4 ‐N (85?3% ~93?0%) and COD (81?8% ~92?9%) w ere ob‐served in the w etland w ith 19 cm w ater level .T he I ris p seudacorus g rew w ell and show ed potential for enhancing nutrient purification in V FCWs w ith three different w ater levels .Plant uptake accounted for 19?2% ~27?3% of T N and 14?7% ~19?2% of T P removed in the V FCW systems .T N and T P contents (19?8~22?8 and 1?5~1?8 mg/g) and T N and T P uptake by plants(33?2~52?9 and 2?6~4?7 mg/m2 ·d) in above‐ground tissue w ere significantly higher than those in below‐ground tissue ,w hich indicated that the above‐ground portion played a more significant role in plant uptake .The nitrogen transformation mi‐crobial population of surface layer significantly increased w ith domestication and cultivation in the V FCWs .T he populations of nitrosobacteria and nitrobacteria (104 ~106 and 105 ~107 M PN/g ) reduced with the increasing w ater level ,w hile the denitrifying bacteria (103 ~106 M PN/g ) increased .