Study on the purification effects of aquatic plant floating-beds for urban polluted water

Abstract

Abstract: Three kinds of ecological floating-beds were made of Hydrocotyle vulgaris, Nymphaea tetragona and Iris sibirica, respectively, to study their purification effects on removing pollutants of urban polluted water. The experiment lasted for 35 days. The results indicated that the three aquatic plants were adaptable to grow in the urban polluted water, and their biomass, height and root increased significantly at the end of the experiment. The growth rates were Nymphaea tetragona>Hydrocotyle vulgaris>Iris sibirica. Three plants had strong ability to remove COD_Cr, NH⁺₄-N, TN and TP, which were higher than that in the control treatments (P<0.05). The removal rates of TN by Hydrocotyle vulgaris, Nymphaea tetragona and Myriophyllum verticillatum were 90.0%, 85.7% and 81.2%, respectively. In addition, the removal rates of TP by Hydrocotyle vulgaris, Nymphaea tetragona and Myriophyllum verticillatum were 68.6%, 57.0% and 62.8%, respectively. Based on their significant effects on nitrogen and phosphorus removal, the three plants are recommended as species of aquatic plants in ecological restoration engineering of urban polluted water.

Key words: aquatic plants, polluted water, floating-bed, purification effect

CLC Number:

X172

ZHAO Feng, ZHANG Yong, HUANG Min-sheng, WU Xiao-hui,ZHANG Yi-fan, HE Yan. Study on the purification effects of aquatic plant floating-beds for urban polluted water[J]. Journal of East China Normal University(Natural Sc, 2011, 2011(6): 57-64.

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