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Study on the Removal Rate to TP in Lake Caohai by Common Submerged Macrophytes

QIAO Jianrong\ REN Jiuchang (The State key Laboratory of Environmental Simulation and Pollution Control, Lab of Water Environment Simulation. Center for Environmental Sciences, Peking University, Beijing, 100871) CHEN Yanqing\ SONG Fu (Institute of Ecol  
The removal ability to TN, TP from polluted water in Lake Caohai by eight species submerged macrophytes including Potamogeton crispus, Vallisneria spiralis, Myriophyllum spicatum, Ceratophyllum demersum, Potamogeton pectinatus, Potamogeton maackianus, Chara sp., Edodea canadinsis were studied in this paper. Results shows that each species has great ability to remove TN, TP. During the 12 day experiment period, the removal percentage on TN, TP is 87.7%, 81.4% respectively.The regression relation of TP concentration and time is put emphasis on in this paper. The formulation of the regression equations is y=a e -bx (a0, b0) , which suggests that TP concentration in water declined in negative exponent form with the time continuing.The relation of TP concentration and removal rate to TP is studied too. The v TP equation of each species is given and their formulation is y=a e bx (a0, b0), which shows that within the given TP concentration range (0.14 ̄0.37 mg/L), the removal rate of each species increases with increasing TP concentration. Furthermore, the use of TP t and v TP curves for restoration of aquatic macrophytes is discussed.
【CateGory Index】: X171
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