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首页> 外文期刊>Environmental Science & Technology >Behavior of selected pharmaceuticals in subsurface flow constructed wetlands: A pilot-scale study
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Behavior of selected pharmaceuticals in subsurface flow constructed wetlands: A pilot-scale study

机译：地下流动人工湿地中某些药物的行为：中试研究

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Subsurface flow constructed wetlands (SSFs) constitute a wastewater treatment alternative to small communities due to the low operational cost, reduced energy consumption, and no sewage sludge production. Although much information is available about conventional water quality parameters in SSF constructed wetlands, few data are available regarding specific contaminants. In this paper, we focus on the behavior of three widely used pharmaceuticals (clofibric acid, ibuprofen, and carbamazepine) in two pilot SSF constructed wetlands planted with Phragmites australis and characterized by different water depths (i.e., 0.3 and 0.5 m). These SSFs partially treat the urban wastewater from a housing development (ca. 200 inhabitants). The three pharmaceuticals and bromide were continuously injected into the two SSFs during a period of 150-200 In, and the effluent concentration was simultaneously measured as 6 h composite samples. Their removal efficiency was calculated from the injected concentration, and the hydraulic parameters were evaluated and compared to bromide as tracer. In this regard, the behavior of clofibric acid was similar to that of bromide, and no sorption into the gravel bed occurred. On the other hand, carbamazepine showed a higher sorption than bromide and clofibric acid, which is attributable to its interaction on the gravel bed. Accordingly, the use of clofibric acid as a hydraulic tracer is proposed, taking into account its low residence time. lbuprofen removal was 81% in the shallow SSF and 48% in the deep one. Differences in removal efficiency could be explained by the less anaerobic environment of the shallow wetland.
机译：地下流动人工湿地（SSF）构成了小型社区的废水处理替代品，因为其运营成本低，能耗降低且没有污水污泥产生。尽管可以获得关于SSF人工湿地中常规水质参数的大量信息，但有关特定污染物的数据却很少。在本文中，我们着眼于三种广泛使用的药物（氯纤维酸，布洛芬和卡马西平）在两个试验性SSF人工湿地上种植的芦苇的行为，这些湿地种植了芦苇并具有不同的水深（即0.3和0.5 m）。这些SSF可以部分处理住房开发中的城市废水（约200名居民）。在150-200 In的时间内，将三种药物和溴化物连续注入两个SSF中，同时以6 h复合样品的形式测量流出物浓度。从注入浓度计算出它们的去除效率，并评估了水力参数，并与溴化物作为示踪剂进行了比较。在这方面，氯纤维酸的行为类似于溴化物，并且没有发生吸附到砾石床中的现象。另一方面，卡马西平显示出比溴化物和氯纤维酸更高的吸附力，这归因于其在砾石床上的相互作用。因此，考虑到其短的停留时间，建议使用氯纤维酸作为水力示踪剂。浅层SSF中布洛芬的去除率为81％，深层中为48％。浅层湿地厌氧环境较少的原因可以解释去除效率的差异。

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