Abstract
The transient response of a draft tube gas—liquid—solid fluidized bed biofilm reactor (DTFB) to a step increase in influent phenol concentration was experimentally investigated. A mathematical model, which considers the external mass transfer resistance, the simultaneous diffusion, reaction, and adsorption of phenol and oxygen inside the bioparticles, the dynamics of biofilm growth, and the time delay of microbial growth during the transient period, is proposed. The biofilm properties such as thickness and density are allowed to vary in the model with biofilm growth to simulate the real biofilm system. Simulation results predicted from the proposed model show reasonable agreement with the experimental data.
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