Surface water bodies worldwide may be contaminated with various organic contaminants. In many cases, the actual toxicity thresholds to nontarget organisms are unknown, thus presenting unknown risks. This study evaluated the potential use of floating treatment wetlands (FTWs) planted with Canna flaccida (common name: Canna) for removing two pharmaceuticals (acetaminophen and carbamazepine) and one herbicide (atrazine) from contaminated water. Triplicate FTWs with varying plant densities were established in 378 L mesocosms. After dosing the mesocosms with the contaminants, water samples were collected over a 12-week period for analysis. The planted FTWs showed differing abilities for removing acetaminophen, atrazine, and carbamazepine. Plant densities on the FTWs did not affect dissipation of acetaminophen or atrazine, but did carbamazepine. All acetaminophen residues were removed from the water within 2 weeks, while all atrazine residues were removed within 12 weeks. Approximately, 79−92% of these residues removed were associated with the FTWs. In contrast, all of the carbamazepine was not removed after 12 weeks, at which time only 29–36.7% of the total removed was associated with the FTWs. Overall results suggest that FTWs established with C. flaccida are promising for removing trace concentrations of acetaminophen, atrazine, and carbamazepine from surface water.

全球地表水体可能被各种有机污染物污染。在许多情况下，对非目标生物的实际毒性阈值是未知的，因此存在未知的风险。这项研究评估了使用Canna flaccida种植的漂浮处理湿地（FTW）的潜在用途（通用名称：Canna）用于从污水中去除两种药物（对乙酰氨基酚和卡马西平）和一种除草剂（阿特拉津）。在378 L的中观世界中建立了具有不同植物密度的三重FTW。在向中膜注入污染物后，在12周的时间内收集水样进行分析。种植的FTW显示出不同的清除对乙酰氨基酚，阿特拉津和卡马西平的能力。FTWs上的植物密度不会影响对乙酰氨基酚或阿特拉津的消散，但会影响卡马西平。在2周内将所有对乙酰氨基酚残留物从水中去除，而在12周内去除所有阿特拉津残留物。大约有79-92％的残留物与FTW相关。相反，所有卡马西平在12周后仍未去除，此时只有29–36。删除的总数的7％与FTW相关。总体结果表明，FTW建立了松果梭菌有望从地表水中去除痕量的对乙酰氨基酚，阿特拉津和卡马西平。