[Study on nitrogen removal treating agriculture wastewater in subsurface constructed wetland].
Nitrogen removal in subsurface constructed wetland treating agriculture non-pointed wastewater was studied in pilot-scale. The experimental results showed that the removal rates of TN increases with HRT increasing. The removal rates of TN achieved 60% in macrophyte bed system when the nominal hydraulic retention time was 5 days. Removal of TN followed first-order plug flow kinetics. Rate constant of Non-plant bed, Phragmitas communis bed and Zizania caduciflora bed was 0.14, 0.26 and 0.20 d-1 respectively. Denitrification was the main removal mechanism of total nitrogen, the amount of TN that can be removed by harvesting were above 15% compared to the loading into constructed wetland system.
Zhang
Rongshe
R
Pollution Control and Resource Reuse Lab, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. zhrs555@sina.com
Zhou
Qi
Q
Zhang
Jian
J
Shi
Yunpeng
Y
D000383:Agriculture; D017753:Ecosystem; D009584:Nitrogen / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014872:Water Movements; D014876:Water Pollution / Q000517:prevention & control*
D009584:Nitrogen