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Summary

The tangential flow configuration in a photoelectrocatalytic reactor significantly enhances the degradation of Reactive Red 239 textile dye. This setup, using solar radiation and UV-LEDs, maximizes Photocatalytic Space-time Yield (PSTY).

Keywords:
Computational Fluid Dynamicsmass transferphotocatalytic space-time yieldphotoelectrocatalytic reactor designtextile dye degradation

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Area of Science:

  • Environmental Engineering
  • Chemical Engineering
  • Photocatalysis

Background:

  • Textile dyes pose environmental challenges due to their persistence and toxicity.
  • Photocatalytic degradation offers a promising method for treating dye-contaminated wastewater.
  • Optimizing reactor design and operational conditions is crucial for efficient dye removal.

Purpose of the Study:

  • To identify the optimal photoreactor flow configuration for maximizing Photocatalytic Space-time Yield (PSTY).
  • To determine operational conditions for efficient degradation of Reactive Red 239 textile dye.
  • To evaluate the performance of a photoelectrocatalytic reactor for dye wastewater treatment.

Main Methods:

  • Numerical simulations using Computational Fluid Dynamics (CFD) to model fluid dynamics and reaction kinetics.
  • Comparison of axial flow (AF) and tangential flow (TF) configurations.
  • Modeling of momentum and species transport, including surface reaction kinetics.

Main Results:

  • Tangential flow (TF) configuration yielded higher Space-time Yield (STY) than axial flow (AF) in both laminar and turbulent regimes.
  • TF configuration promotes helical fluid movement, enhancing mixing and mass transfer.
  • Turbulent flow combined with solar radiation maximized Photocatalytic Space-time Yield (PSTY).

Conclusions:

  • The TF photoreactor configuration is superior for degrading Reactive Red 239 dye.
  • Optimal PSTY of 45 g/day-kW achieved with TF, 0.2 m/s inlet velocity, solar radiation, and 14 W/m² UV-LEDs.
  • This study provides a pathway for efficient and sustainable treatment of textile dye wastewater.