<![CDATA[The operation of the sequencing batch reactor (SBR) can be optimized by controlling the dissolved oxygen concentration, the dosage of external carbon, nitrification and denitrification, and the phase length of aeration (fills and react period). In this work, the analyses and tested with open loop identification the effect of fill and react period change on the performance of the SBR were studied. The process dynamic has been tested to determine the effect of Fill (tf) and React (tr)period changes on soluble substrate (Ss), soluble intermediate product (Ps), inert substrate (Si), particulate organics concentration (Xs), active biomass concentration (Xa), inert biomass concentration (Xi), the total biomass concentration (Xto) and the effluent chemical oxygen demand (COD) concentration in the SBR. In all simulations the total Fill and React time were set at 6 h, with the Fill time varied at 0.5 h, 1 h, 1.5 h, 2 h, 2.5 h, 3 h, and the corresponding react time set at 5.5 h, 5 h, 4.5 h, 4 h, 3.5 h, and 3 h, respectively.Keywords: fill time and reaction time, sequencing batch reactor, wastewater treatment]]>
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