Studies on the Sewage Treatment for Methane Fermentation,Denitrfication and Phosphorus Removal by Rotating Biological Contactor.

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The Influent Domestic Sewage BOD_5 and TOC ranged from 50 to 140 mg/1 and 25 to 70 mg/1 respectively. On the Basis of the Results of this Investigation it was Concluded that:1) Maximum TOC Removal Retes of 90% at 35゜C of waste water Temperature and HRT with 6 hours,75% at 20゜C.2) Nitrification and Denitrification Rates of 95% at 25゜C of Waste Water Temperature and HRT with 6 hours.3) Attached Bacteria bring up Methanosarcing and Methanobacterium.4) Phosohorus Removal Rates of 80% at 20゜C of Waste Water Temperature and HRT with 6 hours by iron Plate Disk.5) Disk Material have Suitable for Ceramic than Polyethylene.6) The Phenomenon of Simultaneous Organic Oxidation,Nitrification and Denitrification Exists in Rotating Biological Contactor. The intrinsic activity of Nitrifying Bacteria would gradully Increase with the Depth of Biofilm,while that of Heterotrophic Bacteria would Decrease with it,Becouse of the Difference in the Specific Growth rate of Both Bacteria.