Phosphorus removal efficiency of Yaonigou constructed wetland on Fuxian lakeshore

Abstract

Abstract: To mitigate and control the eutrophication of the waters in Fuxian Lake bay,1 hm² Yaonigou constructed wetland was built on the north Fuxian lakeshore,and the P removal of the wastewater from Yaonigou River was investigated by the techniques of precipitation pond,oxidation pond,and subsurface-and surface flow constructed wetland.The results demonstrated that this constructed wetland had a very strong capacity (7.8%～81.1%) of total phosphorus (TP) removal.The average removal rate of TP was 54.9%,and the TP retention in the constructed wetland was 265mg·m^-2·d^-1,of which,plant assimilation was 26.1mg·m^-2·d^-1,about 10% of the total.The TP removal was mainly through adsorption and sedimentation,but the seasonal growth dynamics of main plant Oenanthe javanica could have a definite effect on the efficiency of TP removal.During the examination,the TP retention capacity was in order of subsurface flow constructed wetland>oxidation pond>precipitation pond>surface flow constructed wetland.

Key words: Fuxian Lake, Constructed wetland, Phosphorous removal efficiency

CLC Number:

X171.4

CHEN Yuangao, WU Xianhua, LI Wenchao, KONG Zhiming . Phosphorus removal efficiency of Yaonigou constructed wetland on Fuxian lakeshore[J]. Chinese Journal of Applied Ecology, 2005, 16(10): 1913-1917.

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