GEMMA-Group of Environmental Engineering and Microbiology, Department of Hydraulic, Maritime and Environmental Engineering, Universitat Politècnica de Catalunya-BarcelonaTech, c/Jordi Girona 1-3, Building D1, E-08034 Barcelona, Spain.
Sci Total Environ. 2012 Oct 15;437:61-7. doi: 10.1016/j.scitotenv.2012.07.087. Epub 2012 Aug 19.
The aim of this study was to examine the effects of climate, season and wastewater quality on contaminant removal efficiency of constructed wetlands implemented in Mediterranean and continental-Mediterranean climate region of Spain. To this end, two experimental horizontal subsurface flow constructed wetlands located in Barcelona and León (Spain) were compared. The two constructed wetland systems had the same experimental set-up. Each wetland had a surface area of 2.95 m(2), a water depth of 25 cm and a granular medium of D(60)=7.3 mm, and was planted with Phragmites australis. Both systems were designed in order to operate with a maximum organic loading rate of 6 g(DBO) m(-2) d(-1). Experimental systems operated with a hydraulic loading rate of 28.5 and 98 mm d(-1) in Barcelona and León, respectively. Total suspended solids, biochemical oxygen demand and ammonium mass removal efficiencies followed seasonal trends, with higher values in the summer (97.4% vs. 97.8%; 97.1% vs. 96.2%; 99.9% vs. 88.9%, in Barcelona and León systems, respectively) than in the winter (83.5% vs. 74.4%; 73.2% vs. 60.6%; 19% vs. no net removal for ammonium in Barcelona and León systems, respectively). During the cold season, biochemical oxygen demand and ammonium removal were significantly higher in Barcelona system than in León, as a result of higher temperature and redox potential in Barcelona. During the warm season, statistical differences were observed only for ammonium removal. Results showed that horizontal subsurface flow constructed wetland is a successful technology for both regions considered, even if winter seemed to be a critical period for ammonium removal in continental climate regions.
本研究旨在探讨气候、季节和污水水质对西班牙地中海和大陆-地中海气候区实施的人工湿地污染物去除效率的影响。为此，比较了位于巴塞罗那和莱昂（西班牙）的两个实验性水平潜流人工湿地。这两个人工湿地系统具有相同的实验设置。每个湿地的表面积为 2.95 m²，水深为 25 cm，颗粒介质的 D(60)=7.3 mm，并种植了芦苇。两个系统的设计目的都是以 6 g(DBO) m(-2) d(-1)的最大有机负荷率运行。巴塞罗那和莱昂的实验系统的水力负荷率分别为 28.5 和 98 mm d(-1)。总悬浮固体、生化需氧量和氨质量去除效率随季节变化，夏季（巴塞罗那和莱昂系统分别为 97.4%比 97.8%；97.1%比 96.2%；99.9%比 88.9%）高于冬季（巴塞罗那和莱昂系统分别为 83.5%比 74.4%；73.2%比 60.6%；19%比无净去除氨）。在寒冷季节，由于巴塞罗那的温度和氧化还原电位较高，生化需氧量和氨的去除在巴塞罗那系统中明显高于莱昂系统。在温暖的季节，仅对氨的去除观察到统计差异。结果表明，即使在大陆气候区，冬季似乎是氨去除的关键时期，水平潜流人工湿地仍是两个地区都成功的技术。
