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《RESOURCES AND ENUIRONMENT IN THE YANGTZA BASIN》 2000-02
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STUDY OF THE EFFECT OF CONSTRUCTED WETLAND ON THE REMOVAL OF MICROCYSTINS

WU Zhen bin,CHEN Hui rong,LEI La mei,SONG Li rong, FU Gui ping,JIN Jian ming,HE Feng,HE Zheng rong(State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072,China)  
Two sets of downflow-upflow constructed wetland systems planted with different macrophytes were irrigated by water with algae bloom for one week. The inflow and outflow of the constructed wetlands were collected to study the removal efficiency of microcystins of the constructed wetland. The content of microcystins were tested by HPLC; the values of temperature, conductivity and dissolved oxygen were also determined,as well as the content of microcystins and microorganism in the water sample. Results showed that the two constructed wetland systems could reduce the microcystins in the inflow with the removal rates of 68.5% and 34.6% respectively. The removal efficiency of the wetland planted with Phragmites australis and Schoenoplectus sp. were better than the wetland planted with Zizania latifolia and Acorus tartarinowii.Among the three kinds of microcystins(RR, YR and LR), the YR is best removed by the constructed wetlands;its content dropped to lower than the test limit. Sorbing by the substrate and degrading by the microbes were the two main processes of the microcystins' removal in constructed wetland, and the microbial process, being largely affected by the conductivity and bacteria activity in the wetland,is more important.
【Fund】: 国家杰出青年科学基金项目!(项目号 3992 5 0 0 7);; 欧盟国际科技合作项目!(合同号ERBIC18CT96 0 0 5 9);; 国家自然科学基金!(项目号
【CateGory Index】: X52
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