Treatment of municipal wastewater using a contact oxidation filtration separation integrated bioreactor |
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Authors: | ZH Li K Yang XJ Yang L Li |
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Institution: | 1. Department of Municipal Engineering, School of Civil Engineering, Wuhan University, No. 8 South Donghu Road, Wuhan 430072, PR China;2. Environmental Science Research Institute, Wuhan University of Science and Engineering, Wuhan 430073, PR China;3. Central and Southern China Municipal Engineering Design and Research Institute, Wuhan 430010, PR China |
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Abstract: | A new contact oxidation filtration separation integrated bioreactor (CFBR) was used to treat municipal wastewater. The CFBR was made up of a biofilm reactor (the upper part of the CFBR) and a gravitational filtration bed (the lower part of the CFBR). Polyacrylonitrile balls (50 mm diameter, 237 m2/m3 specific surface, 90% porosity, and 50.2% packing rate) were filled into the biofilm reactor as biofilm attaching materials and anthracite coal (particle size 1–2 mm, packing density 0.947 g/cm3, non-uniform coefficient (K80 = d80/d10) < 2.0) was placed into the gravitational filtration bed as filter media. At an organic volumetric loading rate of 2.4 kg COD/(m3 d) and an initial filtration velocity of 5 m/h in the CFBR, the average removal efficiencies of COD, ammonia nitrogen, total nitrogen and turbidity were 90.6%, 81.4%, 64.6% and 96.7% respectively, but the treatment process seemed not to be effective in phosphorus removal. The average removal efficiency of total phosphorus was 60.1%. Additionally, the power consumption of the CFBR was less than 0.15 kWh/m3 of wastewater treated, and less than 1.5 kWh/kg BOD5 removal. |
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