RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2006, Vol. 15 >> Issue (1): 54-57.

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BIOFILM CHARACTERISTICS OF THE SUBSTRATE IN INTEGRATED VERTICALFLOW CONSTRUCTED WETLAND

LI Jin1,2，MA Jian-min3，ZHANG Zheng1，ZHANG Jin-lian1，HE Feng1，WU Zhen-bin1   

  • Received:2005-03-02 Revised:2005-04-25 Online:2006-01-20
  • Contact: WU Zhen-bin

Abstract: The biomass, thickness and activity of the biofilm in substrate in integrated verticalflow constructed wetland were studied. The formation time of biofilms varied from 40 to 60 days with the quality of influent water. The biofilms with high trophic level in influent accumulated rapidly, the steady biomass and activity of biofilms were 1.59 and 1.5 times higher. The activity of biofilms with various thicknesses was different, and the optimum thickness was 150 um. The biofilm thickness in different layers of the substrate was dissimilar, the thickest biofilm was in the outmost surface (0~5 cm) of the substrate, being 2~3 times of other layers and 3~4 times of the optimum thickness. Excessive biofilm accumulation was not in favor of improvement of treatment efficiency and prone to cause clog of constructed wetland.

Key words: integrated verticalflow constructed wetland, substrate, biofilm activity, biofilm thickness

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