Modeling of Activated Sludge Bioreactor for BOD degradation in Industrial Wastewater

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Author(s) Dagde, Kenneth | K., Nwokoma | Darlington, B.M.
Pages 1011-1019
Volume 2
Issue 6
Date June, 2012
Keywords modelling, activated sludge, cstr in series, substrate utilization, biomass recycling, petrochemical wastewater treatment.


A model for an activated sludge bioreactor, which describes the dynamic behavior of the substrate-Biological Oxygen Demand (BOD) utilization and biomass growth, is developed. The activated sludge was modeled as system of Continuous stirred tank bioreactor (CSTR) operating isothermally. The model was solved numerically by employing the fourth order Runge-Kutta algorithm and simulated using Matlab program. The model prediction of BOD degradation (31.35mg/l) as compared to plant data (30.0mg/l) showed a deviation of 4.5%. The model simulations reveal 16h as the optimum hydraulic retention time and a recycle ratio of 1.0 for an industrial wastewater treatment plant with MLVSS of 2400mg/l and BOD concentration of 250mg/l. These results, which are in good agreement with the plant design parameters, imply that the WWT plant could be described using system of CSTR configuration.

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