Comparison of the Monod and Kincannon-Stover Models for Kinetic Evaluation in an                       Anaerobic Baffled Reactor (ABR)

Abtahi, Seyyed Mehran; Torabian, Ali; Vosoogh, Ali; Jafari, Babak; Gholizadeh, Mehdi

Comparison of the Monod and Kincannon-Stover Models for Kinetic Evaluation in an Anaerobic Baffled Reactor (ABR)

Document Type : Original Articles

Authors

¹ Master of Science in Civil-Environmental Engineering, Faculty of Environment, University of Tehran.

² Department of Civil-Environmental Engineering, Faculty of Environment, University of Tehran

³ Ph.D Student of Water Engineering, Faculty of Civil, Iran University of Science and Technology, Tehran, Iran

Abstract

Abstract A pilot scale anaerobic baffled reactor (ABR), for treating low-strength industrial wastewater (671.5±49.9 mg COD/L, 350.1±36.8 mg BOD5/L) was studied. The reactor was started with a hydraulic retention time (HRT) of 25 h and this was gradually reduced to 3.33 h. The best reactor performance was observed with an organic loading rate (OLR) of 4.45 g COD/L.d which was at HRT of 4 h and the COD removal efficiency was obtained up to 78.27% and majority of COD removal was occurred in the first compartment. Under these conditions, for prediction of the effluent substrate concentration (Se) and optimum volume of the ABR (V), the Monod and Kincannon-Stover models were investigated. With using the Kincannon-Stover model, parameters of Umax and KB were obtained 2 and 2.14 g COD/L.d, respectively since, for the Monod model, the parameters of K and KS resulted as 1.54 g COD/g VSS.d and 0.21g COD/L, respectively. The regression line for the plotted linear equation of the Kincannon-Stover model had a R2 of 0.84 which was lower than that found for the Monod model with R2 of 0.985. Meanwhile, in the Monod model, the parameters of Y and Kd were obtained 0.073 g VSS/g COD and -0.008 d-1, respectively. The present study demonstrated that the Monod model is more suitable and applicable for formulating a kinetic model for prediction of the effluent substrate concentration and optimum volume of the ABR at the similar operation conditions.

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