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This study aimed to develop integrated fluidized bed bioreactor (iFBBR). The oxidation pond and sand filter were added for more treatment efficiency of this system. The organics substance removal efficiency was developed by using mathematical models of a novel recirculation plug-flow reactor (RPFR) and recirculation completely-mixed stirred tank reactors (RCSTR). The evaluated and predicted of wastewater treatment performance was conducted by a fluidized bed bioreactor with granular activated carbon (FBBR-GAC) and oxidation pond. On-site domestic wastewater was used in this study. The developed RPFR and RCSTR model can precisely predict the effluent BOD of wastewater at the optimum rate of recirculation (R) 936, and optimum rate of the bed's stirrer speed (NB) 26 rpm. The kinetic results showed that the rate of BOD removal of wastewater used with FBBR-GAC reactors and Oxidation pond followed 2nd order kinetic models, with k2nd, RPFR and RCSTR values of 1.543 and 14.602 day-1 for treated sewage effluent, respectively. Additionally, it was found that the RPFR model and RCSTR model were more suitable for describing the behavior of the FBBR-GAC and oxidation pond system. The efficiency of BOD removal of FBBR-GAC was increased from 83.64% to 95.46% when compared with iFBBR. FBBR-GAC used the hydraulic recirculation time (HReT) of 0.0417 day. Both models are important to use for designing the waste water treatment system as constructed wetland.
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