Kinetic model for biodegradation of 2-chlorophenol by acclimated digester sludge in a biofilm reactor

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Yen-Hui Lin

Abstract

A mathematical model was developed to describe the kinetics of biodegradation of 2-chlorophenol (2-CP) by acclimated digester sludge in the fixed-biofilm reactor using dewater sludge-fly ash composite ceramic particle (DFCCP) as a supporting medium. The model system incorporates the mechanisms of diffusive mass transport and Haldane kinetics. The model was solved using a combination of orthogonal collocation method and Gear's method. A laboratory-scale column reactor was conducted to verify the model system. Batch kinetic tests were conducted independently to determine the biokinetic parameters used in the model system. Experimental and model-predicted data for 2-CP effluent concentration, concentration of suspended biomass in effluent agree closely with each other. Under a steady-state condition, the removal efficiency of 2-CP was approximately 94.6%. The amount of biofilm and suspended biomass reached a maximal value in the steady state when the 2-CP flux reached a constant value and remained maximal. The experimental and modeling schemes proposed in this study could be employed to design a pilot-scale or full-scale anaerobic DFCCP fixed-biofilm reactor to treat chlorophenol-containing wastewater.

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