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《Journal of Anhui Agricultural Sciences》 2009-21
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Study on the Purification Efficiency of Duckweed on Nitrogen and Phosphorus Pollutes

YU Bin et al (College of Environmental Science and Engineering,Yangzhou University,Yangzhou,Jiangsu 225009)  
[Objective] The study aimed to definite the characters of duckweed for purifying TN and TP in sewage and screen the optimized duckweed variety that could purify N and P effectively in organic sewage.[Method] With 3 kinds of representative local duckweed varieties selected from the each sample place in Yangzhou City and Kunshan City resp.as the tested materials and the anaerobic wastewater diluted at 5 times and 10 times from the cattle Farm as the tested sewage,10 groups of purification treatments matching with 5 different duckweeds on 2 concn.of sewage were set up to investigate the effect of different duckweed variety on the purification effect of N and P in sewage with different concn.under lab condition.[Result] TN and TP concn.in the sewage were decreased constantly with the increase of duckweed treating time in 0-10 d.The purification ability of Spirodela Schleid on TN and TP was higher than that of Lemna L.The maximal removal rates of duckweed on TN and TP in sewage diluted at 5 times were 71.14% and 81.00% resp.and that in the sewage diluted 10 times were 92.18% and 91.33% resp.[Conclusion] Spirodela Schleid could be taken as the optimized duckweed variety that was suitable to purify N and P effectively in organic sewage in Yangtze River delta region.
【Fund】: 江苏省科技计划项目(BS2007144)
【CateGory Index】: X703
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