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Abstract The processes of sewer biofilm growth and the distribution of DO, NH4+, NO2-, NO3- inside the mature biofilms cultured under wall shear stersses of 1.0, 1.5, 2.0Pa were measured by microelectrode testing technique. The results show as follows: the thicknesses of biofilms cultured under wall shear stresses of 1.0, 1.5, 2.0Pa are (2.3±0.1), (1.9±0.1), (1.6±0.1)mm, respectively;aerobic area and anoxic area were found in biofilms cultured under wall shear stresses of 1.0Pa and 1.5Pa, which indicates nitrification and denitrification existed inside the above biofilms; only aerobic area was found in biofilm cultured under 2.0Pa, indicating only nitrification existed in that biofilm. Thickness of biofilm affects the distribution of DO in biofilm, subsequently affecting the process of transport and transformation of nitrogen in biofilm.
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Received: 20 March 2015
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