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The filtrate generated from a sludge treatment process at a sewage disposal plant is generally returned to the primary clarifier through a sidestream. The concentration of nitrogen and phosphorus in the sidestream was approximately ten times higher than in the influent raw sewage. Therefore, the sidestream effluent contributed to the overall nitrogen and phosphorus loading of about 40% and 100% in the sewage disposal plant, respectively. However, BOD concentration in the sidestream effluent was notably low, and about 0.1 of BOD・TN-1 ratio was much lower than the value required for biological denitrification. An anaerobic fluidized pellet bed bioreactor (AFPB bioreactor) system combined with a contact aerator was applied to remove effectively nitrogenous and phosphorus compounds from the sidestream. The principal advantage of this system is the effective use of solid waste such as the primary sludge as a carbon source for denitrification. The sludge BOD required for sufficient denitrification was approximately 2.76 mg BOD・mg NO 3N-1.Even with the varied loading rate of NH4+-N between 0.15 and 0.37 kgN-m-3・day-1, almost complete nitrification and denitrification were achieved and the nitrogen removal efficiency was maintained over 75% in the sewage treatment system proposed in this study.

An Advanced Treatment of Sidestreams from a Sludge Treatment Process Using an Anaerobic Fluidized Pellet Bed Bioreactor System.