A B S T R A C TThe aim of this research was to remove the chemical oxygen demand (COD) and color from an industrial wastewater using electro-Fenton process. The effects of five important parameters including H 2 O 2 /Fe 2+ molar ratio, current density, pH, H 2 O 2 /Petroleum refinery wastewater and reaction time on the process were carefully considered. The response surface methodology was applied to minimize the number of runs and investigate the optimum operating conditions. Forty-seven runs were carried out and the optimum conditions for COD and color removal were statistically obtained as 80.13% and 75.11% at H 2 O 2 /Fe 2+ molar ratio of 4.2 for COD removal and 2.49 for color removal, current density was 60.89 mA for COD removal and 57.72 mA for color removal, pH was 3.32 for COD and 3.34 for color removal, H 2 O 2 /PRE was 0.05 for COD removal and 0.03 for color removal, and reaction time recorded as 62.05 min for COD removal and 63.04 min for color removal.
In this work, the overall gas hold-up in the riser and down-comer of three internal airlift reactors with a working volume of 10.5, 32 and 200 l at the range of temperatures 18℃ - 21℃, under atmospheric pressure was simulated using Com-putational Fluid Dynamics (CFD). The range of superficial gas velocity was 0.5 - 3 cm/s. The three reactors geometrically were similar to each other. CFD simulation and experimental data showed that the gas hold-up in the riser and down-comer increased by increasing the reactor scale. It was concluded that the simulated data were in good agreement with the experimental ones obtained from the literature
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