[Performance of treatment wetland systems for surface water quality improvement].
Intercropped with Phragmites communis and Typha angustifolia, subsurface flow constructed wetland systems (CWs) with the surface area of 3 x 20m x 2m were established beside Guanting Reservoir, an important source water base of Beijing. The treatment performance of the systems with different season were studied, the impacts of influent concentration, hydraulic loading rate and water temperature on contaminations removal were analyzed. The result showed that the subsurface flow CWs had the better decontamination effect to micro-pollution surface water. The relationship between the concentrations of CODMn and NH4+ -N in inflow and outflow followed the linear equation. The removal rates of total nitrogen (TN) and total phosphorus (TP) in the systems were 20%-60% and 30%-45%, respectively. The removal rates of contaminations were reduced with the decrease of water temperature and the increase of hydraulic loading rate, the removal rates of CODMn, N4+ -N and TN showed the positive correlation with their inflow concentration, but the removal rate of TP showed the negative correlation with its inflow concentration. Operation and management considerations of the subsurface flow CWs in winter were investigated in this study.
Liu
Hong
H
State Key Joint Laboratory of Environmental Simulation and Pollution Control, Institute of Environmental Sciences, Beijing Normal University, Beijing 100875, China. LH64@sina.com
Dai
Ming-li
ML
Liu
Xue-yan
XY
Ouyang
Wei
W
Liu
Pei-bin
PB
D001673:Biodegradation, Environmental; D010944:Plants / Q000378:metabolism*; D012621:Seasons; D032401:Typhaceae / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D014881:Water Supply / Q000032:analysis*
D014874:Water Pollutants, Chemical