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	Nitrogen removal from agricultural runoff by full-scale constructed wetland in China
	Lu, Shaoyong ; Zhang, Pengyi ; Jin, Xiangcan ; Xiang, Changsheng ; Gui, Meng ; Zhang, Jian ; Li, Fengmin
	2010-10-12 ; 2010-10-12
关键词	Nitrogen removal Free water surface Constructed wetland Agricultural runoff Plant harvesting Correlation Rate constant WASTE-WATER TREATMENT SUBSURFACE HORIZONTAL-FLOW POLLUTION CONTROL NUTRIENT PHOSPHORUS TEMPERATURE EFFICIENCY SEDIMENT CLIMATE BALANCE Marine & Freshwater Biology
中文摘要	We aimed at indicating some regularities of a constructed wetland treating agricultural runoff in China. The regularities, including the nitrogen removal capacity all year round, the nitrogen distribution pathways, and the nitrogen species removal kinetics, of a free water surface constructed wetland (2,800 m(2)) in the Dianchi Valley, which has been in operation for 27 months, were studied. The planted Phragmites australis and Zizania caduciflora were harvested biannually. The average inflow rate was recorded by an ultrasonic flow instrument, and then the hydraulic loading rate (HLR) and hydraulic retention time (HRT) were calculated. The average inflow and outflow concentrations of total nitrogen (TN), ammonia, and nitrate were measured, while the corresponding removal rates were calculated, showing better results than other constructed wetlands. Then the distribution pathways of nitrogen were analyzed, which indicated that plant harvesting was more important in wetland-treated agricultural runoff than in domestic wastewater. The reason for a good nitrogen removal capability and the obvious function of plants in the present wetland is the sound climate and intermittent inflow in the wetland. Results showed that inflow load had significant correction with both TN and ammonia removal efficiency. HLR, inflow rate, inflow nitrogen concentration, and temperature had significant and positive correction with both TN and ammonia removal. However, HRT had negative correction with both TN and ammonia removal, and the nitrate removal efficiency and parameters mentioned earlier were not significantly correlated. The rate constant values for nitrate and ammonia in summer were obviously larger than in winter. It is possible that bacterial and microbial activities were more active in summer than winter, and more conducive to bacterial and vegetative growth in summer than winter. Since this study was a pioneer for the implementation of constructed wetlands in China treating agricultural runoff, it has proved that this eco-technology could be used effectively for water quality enhancement in China and other areas with a similar climate.
语种	英语 ; 英语
出版者	SPRINGER ; DORDRECHT ; VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79680]
专题	清华大学
推荐引用方式 GB/T 7714	Lu, Shaoyong,Zhang, Pengyi,Jin, Xiangcan,et al. Nitrogen removal from agricultural runoff by full-scale constructed wetland in China[J],2010, 2010.
APA	Lu, Shaoyong.,Zhang, Pengyi.,Jin, Xiangcan.,Xiang, Changsheng.,Gui, Meng.,...&Li, Fengmin.(2010).Nitrogen removal from agricultural runoff by full-scale constructed wetland in China..
MLA	Lu, Shaoyong,et al."Nitrogen removal from agricultural runoff by full-scale constructed wetland in China".(2010).

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