Abstract
This work presents comprehensive mathematical modelling employed to describe the ozone (O3) mass transfer in the hollow fibre membrane contactor (HFMC) system. Using the model, impacts of operating parameters and membrane specification such as gas phase and liquid flow rates, porosity-to-tortuosity and membrane length on the dissolved ozone at the reactor outlet as well as ozone concentration distribution were simulated. Also, experimental data were used to validate the created simulation model and it was observed that there is reasonable agreement between experimental results and modelling output in terms of dissolved ozone at the reactor outlet at various water flow rate and initial ozone concentration. Based on the simulation outputs, the gas flow rate as well as porosity (ε)-to-tortuosity (τ) do not have impact on the dissolved ozone at reactor outlet while there was slight increase in the ozone outlet concentration with the enhancement of membrane length. Furthermore, the main resistance for ozone mass transfer was liquid phase and it was indicated that the gas phase and membrane subdomain resistance is lower for ozone mass transfer due to higher ozone diffusion coefficient in the gas phase.
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