期刊
ECOLOGICAL ENGINEERING
卷 35, 期 3, 页码 402-409出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecoleng.2008.10.002
关键词
Phosphorus uptake by plants; Ultrasonic flow instrument; Phosphorus removal; Correlation
资金
- Major Special Program of the Ministry of Science and Technology (863 Program) [K99-05-35-02, 2005AA60101005]
- China's national basic research program [2008CB418204]
- Chinese Research Academy of Environmental Sciences of China
A free-water surface wetland covering an area of 2800 m(2) 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.) Trine.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 m(3) d(-1), 12.7 cm d(-1) and 2.0d, respectively. The annual average total phosphorus (TP) in the inflow was 0.87 mg L-1, 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 gm(-2) year(-1). Hydraulic retention time had a significant positive correlation with the removal of P (r(2)=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. (C) 2008 Elsevier B.V. All rights reserved.
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