Mathematical Modeling of Moving Fluidized Bed Bioreactor - Granular Activated Carbon, MFBBR- GAC Domestic Wastewater Treatment for Agricultural Use

Abstract

The objective of this study was to developing mathematical models for Moving Fluidized Bed Bioreactor - Granular Activated Carbon purposely managed to utilize the treated wastewater. The result of using MFBBR – GAC, a highly cylindrical acrylic tank with spiral flow connected with waste water tank, found that the optimal correlation of these variables are as follows: a dry weight (Wdry) of GAC was 4 kg., the initial height of bed (h0) was 0.55 m. The initial height of the saturated filter layer (h0) is 0.55 m with the flow rate of recirculation (QRe) between 13 liters / minute was to number impact nozzle jet water of wheel and the inflow rate of waste water (Qin) 20 Little /day,.It was found that the number of 24 nozzles was not different with the number of 8 nozzles. The 5 parameters of 8 nozzles that were used to construct the prediction equation are 1) the number impact nozzle jet water of wheel fixed (nw): 3 wheels, 2) the distant pipe of lateral (dpl) 0.11 m., 3) the number of pipe of lateral: (nPL) 8 pipes, 4) the diameter of nozzle (dn) 5 mm., 5) the particle diameter of GAC(dp) 1.50
mm. The indicators of moving bed were the 0.11 m movement height of bed (hB), the 11.51 sec. movement time of bed (tB) ,the 42.11 degree movement degrees of bed (B), 26 rpm optimum rate of bed's stirrer speed (NB), and 936 optimum rate of recirculation (R). This system can remove BOD removal efficiency higher than 96.58% of domestic wastewater, and the hydraulic recirculation time (HReT) was 2 hrs and MFBBR – GAC purposely managed to utilize the treated wastewater for agricultural use.