Effect of mass transport limitation and pyrite particulate on the continuous electro-Fenton process treatment of textile industrial dyek

Ahmad, Imran; Basu, Debolina

doi:10.22104/aet.2022.5547.1502

Effect of mass transport limitation and pyrite particulate on the continuous electro-Fenton process treatment of textile industrial dyek

Document Type : Research Paper

Authors

Civil Engineering Department, Motilal Nehru National Institute of Technology, Allahabad, India

10.22104/aet.2022.5547.1502

Abstract

The current study focused on the charge and mass transport effect on the continuous electro-Fenton (EF) process treatment of synthetic Reactive orange 16 (RO16) dye using low-cost stainless-steel electrodes and sodium chloride (NaCl) supporting electrolytes, respectively. Lab-scale experiments were carried out in a 500 mL volume reactor cell at various initial RO16 dye concentrations (75-250 mg/L) and flow rates (0.05-0.4 L/h). The results showed that the decolorization rate increased quantitatively with an increment of the RO16 dye concentration and flow rate due to the mass transport limitation. Increasing the mass flow rate increased the mass transfer coefficient (k_m), improving the kinetics of the decay. It was found that regardless of inflow concentrations, the dye removal efficiency increased with the flow rate. Additionally, the degradation rate, elimination capacity, current efficiency (CE), and specific energy requirement were estimated for the process. A dimensionless current density relation was generated for the developed continuous stirred tank to describe the kinetics and mass transfer relationship towards the overall reaction rate contribution. It was found that the stainless-steel anode electrode proved to be preferable due to lower energy consumption (6.5 kWh m^-3) and less iron sludge production. Additionally, the application of pyrite (FeS₂) particulate electrode increased the process efficiency (~ 5%) for TOC removal and current mineralization while maintaining its sustainability for reuse.

Graphical Abstract

Keywords

Main Subjects

Advanced oxidation processes

References

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