期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 482, 期 -, 页码 294-304出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2014.02.095
关键词
Pharmaceuticals; Micropollutants; Antibiotic resistance genes; Wastewater treatment; Surface flow constructed wetlands
资金
- Environment Canada's Lake Winnipeg Basin Stewardship Fund
- Thomas Sill Foundation
- Lake Winnipeg Foundation
- University of Winnipeg
- Clayton H. Riddell Faculty of Environment, Earth, and Resources at the University of Manitoba
- Natural Sciences and Engineering Research Council of Canada
- Canada Research Chairs Program
- Department of Civil Engineering at University of Strathclyde
Outdoor shallow wetland mesocosms, designed to simulate surface constructed wetlands to improve lagoon wastewater treatment, were used to assess the role of macrophytes in the dissipation of wastewater nutrients, selected pharmaceuticals, and antibiotic resistance genes (ARGs). Specifically, mesocosms were established with or without populations of Typha spp. (cattails), Myriophyllum sibiricum (northern water milfoil), and Utricularia vulgaris (bladderwort). Following macrophyte establishment, mesocosms were seeded with ARG-bearing organisms from a local wastewater lagoon, and treated with a single pulse of artificial municipal wastewater with or without carbamazepine, clofibric acid, fluoxetine, and naproxen (each at 7.6 mu g/L), as well as sulfamethoxazole and sulfapyridine (each at 150 mu g/L). Rates of pharmaceutical dissipation over 28 d ranged from 0.073 to 3.0 d(-1), corresponding to half-lives of 0.23 to 9.4 d. Based on calculated rate constants, observed dissipation rates were consistent with photodegradation driving clofibric acid, naproxen, sulfamethoxazole, and sulfapyridine removal, and with sorption also contributing to carbamazepine and fluoxetine loss. Of the seven gene determinants assayed, only two genes for both beta-lactam resistance (bla(CTX) and bla(TEM)) and sulfonamide resistance (sulI and sulII) were found in sufficient quantity for monitoring. Genes disappeared relatively rapidly from the water column, with half-lives ranging from 2.1 to 99 d. In contrast, detected gene levels did not change in the sediment, with the exception of sulI, which increased after 28 d in pharmaceutical-treated systems. These shallow wetland mesocosms were able to dissipate wastewater contaminants rapidly. However, no significant enhancement in removal of nutrients or pharmaceuticals was observed in mesocosms with extensive aquatic plant communities. This was likely due to three factors: first, use of naive systems with an unchallenged capacity for nutrient assimilation and contaminant removal; second, nutrient sequestration by ubiquitous filamentous algae; and third, dominance of photolytic processes in the removal of pharmaceuticals, which overshadowed putative plant-related processes. (C)2014 Elsevier B.V. All rigths reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据