Advanced Treatment Using Sequencing Batch Reactor Activated Sludge Process Combined with UF Menbrane Process.

Abstract

To achieve stable removal of BOD, nitrogen and phosphorus, UF membrane process was combined with intermittent aeration sequencing batch activated sludge process(SBR process). The effect of a hybrid system was studied comparing with that of a SBR system using bench scale plants.Removal efficiencies of BOD and T-N in a hybrid system were higher than those in a SBR system, whereas removal efficiency of T-P was similar in both systems. In order to diminish UF membrane facility in size, a quadruple reactor type hybrid system was developed and it was successfully applied.A hybrid system was able to keep high removal efficiencies when the bulking of activated sludge occured. The flux of UF membrane was recovered by washing with 0.1N NaOH and 10% H2O2 solutions.