کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9491510 | 1630190 | 2005 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of pond shape and vegetation heterogeneity on flow and treatment performance of constructed wetlands
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effect of pond shape and vegetation heterogeneity on flow and treatment performance of constructed wetlands Effect of pond shape and vegetation heterogeneity on flow and treatment performance of constructed wetlands](/preview/png/9491510.png)
چکیده انگلیسی
A model framework is developed for nitrogen transformations in a constructed wetland by combining both hydraulics and chemical transformation of nitrogen species. The nitrogen concentration of the effluent water is represented in terms of a convolution between the probability density function of the hydraulic residence times and a chemical transformation function describing the rate of mass-removal of total nitrogen with time in the water as a first-order reaction. Closed-form solutions to the treatment efficiency is derived and related to the nitrogen reduction in wetland Alhagen in Nynäshamn, Sweden. Further, the model coefficients are explored by numerical simulations and expressed in terms of heterogeneity of the flow resistance, i.e. in vegetation, and the aspect ratio of the wetland. Heterogeneity in vegetation contributes to increasing the variance of the water residence time and this increases the effluent concentration of nitrogen. Based on the theory and the data from Alhagen, the residence time probability density function for water can have a significant influence on the treatment, and particularly the aspect ratio markedly affects the active water volume and the treatment efficiency.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hydrology - Volume 301, Issues 1â4, 20 January 2005, Pages 123-138
Journal: Journal of Hydrology - Volume 301, Issues 1â4, 20 January 2005, Pages 123-138
نویسندگان
Anders Wörman, Veronika Kronnäs,