Evaluation of Ecological Purification Effect on Water Quality of
River Source Area in Lixia River
HANG Qingfeng1, XIA Ting2, WU Qinkai2, HE Tao2
(1. Yancheng Branch of Hydrology and Water Resources Bureau of Jiangsu Province, Yancheng 224002, Jiangsu, P. R. China;
2. School of Urban Construction, Nanjing University of Technology, Nanjing 211816, Jiangsu, P. R. China)
Abstract：In order to ensure long-term and stable operation of the Yanlong Lake project and regional water supply safety, the change
trends of 4 key water quality factors such as DO, NH3-N, CODMn and TP were analyzed, according to the monitoring data of water quality
in 5 drinking water source areas (Longgang, Yancheng New, Dazong Lake, Dagang, Gu Dianbao ) from 2009 to 2016, in the Lixiahe River
network region in northern Jiangsu province. Meanwhile, combined with the corresponding water quality factors and Chl-a index changes
in different purification function areas of the Yanlong Lake Project, the water quality purification effect and existing problems of
the ecological engineering in the source area were evaluated. The results indicate that the water quality in 5 water source areas is
greatly diverse in different water periods. In high and flat water periods, the standard-exceeding rates of water quality are
obviously higher than that in dry periods, especially for the factors of DO and CODMn in high periods, with the higher standard-
exceeding rates. The Yanlong Lake Project generally has a better purification effect on the water quality of the source area of
Mangshe River, but the purification effect of different water quality factors is different in different water periods and different
functional areas. On the whole, the project has the best effect to enhance DO, but the reduction rate of CODMn is low, meanwhile, the
concentration of Chl-a is high in spring and summer.
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2018, Vol. 37 
