2011•Environmental Science & TechnologyRequires access

Purification of Eutrophic Water of Different Degrees with Hydrophytes

Song Zhou

Abstract

To select better purification plants for eutorphic water of different degrees,the simulated constructed wetland system was used to treat sewage artificially made.Removal abilities of TP,TN,NH4+-N by five hydrophytes including Azolla imbircata(Roxb.)Nakai,Salvinia natans(L.)All.,Marsilea quadrifolia L,Hydrilla verticillata,Sagittaria sagittifolia in mildly,moderately and seriously eutrophic water were compared in the sampling period of 7d.Results showed that removal ability by these five hydrophytes increased with the improvement of the degree of eutrophic water,with removal ability ranking as Azolla imbircata(Roxb.)Nakai,Hydrilla verticillata,Marsilea quadrifolia L,Salvinia natans(L.)All.and Sagittaria sagittifolia in seriously eutrophic water.Removal rates of TN,TP,NH4+-N by Azolla imbircata(Roxb.)Nakai were 94.51%,77.41% and 74.64% respectively.

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Key concepts: Hydrilla, Azolla, Eutrophication, Aquatic plant, Pistia, Stratiotes, Biology, Botany