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《Environmental Science & Technology》 2009-02
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Characteristics of Constructed Wetland Hydrophytes and Its Contribution to Municipal Wastewater Treatment System

GUO Ya-ping, WU Xiao-fu, HU Yue-li (Central South University of Forestry and Technology,Changsha 410004,China)  
Removal efficiency of contamination and function of wetland hydrophytes including Eichhornia Crassipes, Nymphoides peltata,Acorus calamus L.,Cockspur grass,Hydrilla verticillata,Hybird Giant Napier and Cana generalis Bailey introduced into municipal wastewater treatment system was studied. Results of pot culture test showed that although direct removal efficiency of TN and TP from wastewater by hydrophytes was only 14.0%~59.4% and 8.6%~55.2% respectively,total removal efficiency of TN and TP in system reached 65.4%~83.8% and 43.5%~69.5% respectively through filtration and retention process as well as degradation and transformation of organics strengthened by hydrophytes. Results of pilot test indicated that monthly removal efficiency of TN,TP and CODcr in system reached 80.4%,74.3% and 81.3% after different types of wetland hydrophytes introduced into municipal wastewater treatment system. Compared with conventional biochemical wastewater treatment system,it was found that the treatment effect had increased greatly and energy consumption for biochemical reaction had been decreased relatively with steady effluent water quality,which is an effective method to prevent municipal water from eutrophication on the basis of removing N and P from wastewater by hydrophytes.
【Fund】: 中挪政府间技术合作“株洲环境工程项目”;; 株洲市科技局项目(2003-2)
【CateGory Index】: X173;X703
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