کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4390542 | 1305179 | 2009 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phosphorus removal from agricultural runoff by constructed wetland
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
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چکیده انگلیسی
A free-water surface wetland covering an area of 2800 m2 was operated from March 2002 to June 2004 for agricultural runoff treatment in the Dianchi Valley in China. In the wetland were grown Zizania Caduciflora Turez Hand-mazt and Phragmites australis (Cav.) Trin.ex Steud. The instantaneous inflow rate was measured and the integrated flux was recorded by an ultrasonic flow instrument all year round. The average inflow rate, hydraulic loading rate (HLR) and hydraulic retention time (HRT) were kept at 242 m3 dâ1, 12.7 cm dâ1 and 2.0 d, respectively. The annual average total phosphorus (TP) in the inflow was 0.87 mg Lâ1, and the corresponding removal efficiency was calculated to be 59.0%. Biannual plant uptake and removal by harvesting and seed transport was the main pathway for TP removal, while the influent TP load was 12.9 g mâ2 yearâ1. Hydraulic retention time had a significant positive correlation with the removal of P (r2 = 0.88). Water temperature, inflow phosphorus load, inflow and hydraulic load rates were positively correlated with the removal of P. Inflow phosphorus concentrations were negatively correlated with the removal of P. It is shown that the free-water surface wetland was an effective and economical system for agricultural runoff treatment in lake regions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 35, Issue 3, 4 March 2009, Pages 402-409
Journal: Ecological Engineering - Volume 35, Issue 3, 4 March 2009, Pages 402-409
نویسندگان
S.Y. Lu, F.C. Wu, Y.F. Lu, C.S. Xiang, P.Y. Zhang, C.X. Jin,