Textile Dye Removal Using Photocatalytic Cascade Disk Reactor Coated by ZnO Nanoparticles
- 1 Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
- 2 Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
- 3 Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
Abstract
Dye effluents with low BOD/COD ratio and varied chemical structures are usually very recalcitrant to microbial degradation. Therefore, different process was used for the treatment of dye effluent. Heterogeneous photocatalyst process has been widely used as leading green technology for dye removal. The process utilizes a semiconductor photocatalyst (such as TiO2 or ZnO) and UV light to oxidize the recalcitrant organic compounds to inorganic ions, carbon dioxide and water. Photocatalytic process needs to photorectors and hydraulic parameters play an important role in mass transfer phenomenon in photocatalytic reactors. These fundamental parameters are flow rate, relative roughness and Reynolds number. This research experimentally evaluates flow rate and artificial relative roughness in order to determine the factors influencing the removal efficiency and reaction rate. For this purpose, a cascade photocatalytic reactor is constructed which consists of similar Plexiglas plates coated by various roughness. Numerical simulation usually overcomes complex reactor models which takes reasonable cost respect to experimental study. Here, OpenFOAM software is also utilized to perform a numerical study. Regime and velocity of sewage are simulated in photocatalytic flow with/without considering relative roughness.
- Reddy, S.S., Kotaiah, B. and Reddy, N.S.P. (2008) Color Pollution Control in Textile Dyeing Industry Effluents Using Tannery Sludge De-rived Activated Carbon. Bulletin of the Chemical Society of Ethiopia, 22.
- Basturk, E. and Karatas, M. (2015) Decolorization of Antra-quinone dye Reactive Blue 181 Solution by UV/H2O2 Process. Journal of Photochemistry and Photobiology A: Chemistry, 299, 67-72. https://doi.org/10.1016/j.jphotochem.2014.11.003
- Mehrjouei, M., Müller, S. and Möller, D. (2015) A Review on Photocatalytic Ozona-tion Used for the Treatment of Water and Wastewater. Chemical Engineering Journal, 263, 209-219. https://doi.org/10.1016/j.cej.2014.10.112
- Zou, L., Li, Y. and Hu, E. (2005) Photocatalytic Decolorization of Lanasol Blue CE Dye So-lution Using a Flat-Plate Reactor. Journal of Environmental Engineering, 131, 102-107. https://doi.org/10.1061/(ASCE)0733-9372(2005)131:1(102)
- Vezzoli, M., Martens, W.N. and Bell, J.M. (2011) Investigation of Phenol Degradation: True Reaction Kinetics on Fixed Film Titanium Dioxide Photocatalyst. Applied Catalysis A: General, 404, 155-163. https://doi.org/10.1016/j.apcata.2011.07.025
- Malayeri, H.Z., Ayati, B. and Ganjidoust, H. (2014) Photocatalytic Phenol Degradation by Immobilized Nano ZnO. Water Environment Research, 86, 771-778. https://doi.org/10.2175/106143014X13975035526301
- Yu, H., Zhang, K. and Rossi, C. (2007) Theoretical Study on Photocatalytic Oxidation of VOCs Using Nano-TiO 2 Photocatalyst. Journal of Photochemistry and Photobiology A: Chemistry, 188, 65-73. https://doi.org/10.1016/j.jphotochem.2006.11.021
- Zhang, Y., Stefanakos, E.K. and Goswami, D.Y. (2013) Effect of Photocatalytic Surface Roughness on Reactors Effectiveness for Indoor Air Cleaning. Building and Environment, 61, 188-196. https://doi.org/10.1016/j.buildenv.2012.12.018
- Kumar, J. and Bansal, A. (2013) Photocatalytic Degradation in Annular Reactor: Mod-elization and Optimization Using Computational Fluid Dynamics (CFD) and Response Surface Methodology (RSM). Journal of Environ-mental Chemical Engineering, 1, 398-405. https://doi.org/10.1016/j.jece.2013.06.002
- Ahmed, S., et al. (2011) CFD Simulation of Turbulence Promoters in a Water Treatment Reactor.
- Vezzoli, M. (2012) Intrinsic Kinetics of Titania Photocatalysis: Simplified Models for Their investigation.