Media surface properties and the development of nitrifying biofilms in mixed cultures for wastewater treatment |
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| Authors: | T Stephenson E Reid LM Avery B Jefferson |
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| Institution: | 1. Department of Civil Engineering, University of Granada, 18071 Granada, Spain;2. Institute for Water Research, University of Granada, 18071 Granada, Spain;1. Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia;2. Research Centre for Sustainable Process Technology (CESPRO), Faculty of Engineering and Built Environment, Universiti Kebangsaaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia;3. Processing & Engineering, Research & Development Centre, Sime Darby Research Sdn Bhd, Lot 2664 Jalan Pulau Carey, Pulau Carey, 42960 Kuala Langat, Selangor, Malaysia |
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| Abstract: | Plastic was tested to select biofilm support media that would enhance nitrification in the presence of heterotrophs. Eight different types (acrylonitrile butadiene styrene, nylon, polycarbonate, polyethylene, polypropylene, polytetrafluoroethylene (PTFE), polyvinyl chloride and tufnol) were immersed in an aerobic fed-batch reactor receiving domestic settled wastewater. Nitrification rates did not correlate with biomass concentrations, nor surface roughness of the plastics as measured by atomic force microscopy (AFM). The maximum nitrification rate of 1.5 g/m2 d?1 was obtained from biofilms growing on PTFE which had the lowest surface adhesion force (8 nN). Nitrification rates for the biofilms were inversely correlated with the attraction forces as measured by AFM. |
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