垂直流人工湿地去除布洛芬和罗红霉素的影响因素分析
Analysis on influence factors of ibuprofen and roxithromycin removal in vertical flow constructed wetlands
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摘要: 选择典型消炎药布洛芬和抗生素罗红霉素作为研究对象,研究垂直流人工湿地中植物、水力停留时间、进水方式对布洛芬和罗红霉素的去除效果的影响.结果显示,在湿地种植的美人蕉、花叶芦竹、伞草和无植物对照组中,美人蕉组去除布洛芬的效率最高(69.74%),花叶芦竹对罗红霉素的去除效果最好(94.06%);在0-4 d范围内设置水力停留时间(HRT),发现增加水力停留时间可以使布洛芬更加充分的被人工湿地中生物降解,它的最佳水力停留时间为4 d,而罗红霉素在HRT=4 d时的去除效率与HRT=2 d相比并没有显著提高(P > 0.05),却增加了运行成本,故2 d才是罗红霉素相对合适的水力停留时间;两种药物的去除效率还受进水方式的影响,快速进水的进水方式有利于布洛芬和罗红霉素的去除.通过方差分析发现,去除布洛芬时,美人蕉去除效果并未显著优于花叶芦竹和伞草组(P > 0.05);在去除罗红霉素时,花叶芦竹的去除效果显著优于美人蕉组和伞草组(P<0.05),伞草与美人蕉组没有显著差异(P>0.05);3组有植物组的人工湿地对布洛芬和罗红霉素去除效果均明显好于无植物组(P<0.01);罗红霉素实验组植物类型与进水方式交互作用显著.Abstract: Selecting typical antiphlogistic drugs ibuprofen and the antibiotic roxithromycin as research objects, the study investigated the influence of the plants, hydraulic retention time and influent pattern on the removal efficiency of ibuprofen and roxithromycin in vertical flow constructed wetlands. The results showed that in the comparison between the Canna indica, Arundo donax var, Umbellifera planted in wetlands and no plant controls, the Canna indica control had the highest removal efficiency(69.74%) for ibuprofen, and the Arundo donax var control had the best removal efficiency for roxithromycin(94.06%). By setting up hydraulic retention time in the 0-4 d range, the study found that increasing hydraulic retention time made ibuprofen more fully degraded by biological in constructed wetlands, and its best hydraulic retention time was 4 d. However the removal efficiency of the roxithromycin at HRT=4 d didn't improve significantly, compared with the removal efficiency of the roxithromycin at HRT=2 d(P > 0.05). While the operating costs increased, relatively appropriate hydraulic retention time was 2 d. The removal efficiency of the two pharmaceuticals were also influenced by the influent pattern, and the water quick feeding increased the removal efficiency of ibuprofen and roxithromycin. Through the analysis of the variance, it was found that when removing ibuprofen, the removal efficiency of the Canna indica was not significantly higher than Arundo donax var and Umbellifera(P > 0.05). When removing the roxithromycin, the removal efficiency of the Arundo donax var was significantly higher than the Canna indica and Umbellifera(P<0.05),and the Umbellifera and Canna indica controls had no significant difference(P>0.05). Three controls constructed wetlands with plants had highter removal efficiency for ibuprofen and roxithromycin than the controls without plants(P<0.01). And the experimental group of roxithromycin plant types had obvious interaction with influent pattern.
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Key words:
- constructed wetland /
- ibuprofen /
- roxithromycin /
- influent pattern /
- hydraulic retention time
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