earticle

영어

A systematic approach to determine the optimal operation strategy for nitrogen and phosphorus removal of sequencing batch reactors (SBR) has been developed and applied to successfully to a pilot-scale SBR. Activated Sludge Model No. 2d (ASM2d) is employed to model the SBR. Then, based on a survey of the relevant literature and a preliminary model-based analysis of the system, the following degrees of freedoms were identified and used for the SBR optimization: oxygen set-point in the aerobic phase (SO) and the lengths of anaerobic (TAN), aerobic (TA), and feeding (TF) phases. A grid of scenarios is formulated as fullfactorial experimental design to simulate the effect of the key degrees of freedom in the SBR system. Based on the effluent quality and robustness index of the best scenarios, the SBR operation under the condition (TF = 60 min, TAN = 140 min, TA = 240 min, SO = 2.0 mg O2/L) appeared to be the best scenario to provide effluent quality below discharge standards accompanied with good system stability. Under this scenario, the existing SBR performance for phosphorus removal could be improved by 93%.