Title: The photocatalytic degradation of bezacryl yellow in a presence of TiO₂ - hydrodynamic contribution

Authors: Lamia Khenniche; Farida Benissad-Aissani; Abdeltif Amrane; Abdelkrim Bouzaza; Florence Fourcade; Lidia Favier

Addresses: Laboratoire de Génie de l'Environnement, Département de Génie des Procédés, Faculté de Technologie, Université de Bejaia, Bejaia, Algérie ' Laboratoire de Génie de l'Environnement, Département de Génie des Procédés, Faculté de Technologie, Université de Bejaia, Bejaia, Algérie ' École Nationale Supérieure de Chimie de Rennes, Université de Rennes 1, CNRS, UMR 6226, 11allée de Beaulieu, CS 50837, 35708 Rennes Cedex 7, France ' École Nationale Supérieure de Chimie de Rennes, Université de Rennes 1, CNRS, UMR 6226, 11allée de Beaulieu, CS 50837, 35708 Rennes Cedex 7, France; Université Européenne de Bretagne, 5 Boulevard Laënnec, 35000 Rennes, France ' École Nationale Supérieure de Chimie de Rennes, Université de Rennes 1, CNRS, UMR 6226, 11allée de Beaulieu, CS 50837, 35708 Rennes Cedex 7, France; Université Européenne de Bretagne, 5 Boulevard Laënnec, 35000 Rennes, France ' École Nationale Supérieure de Chimie de Rennes, Université de Rennes 1, CNRS, UMR 6226, 11allée de Beaulieu, CS 50837, 35708 Rennes Cedex 7, France; Université Européenne de Bretagne, 5 Boulevard Laënnec, 35000 Rennes, France

Abstract: A pilot installation was carried out in the research laboratory containing a photocatalytic reactor. It is intended to eliminate organic pollutants, including a textile dye [bezacryl yellow (BZY)] in the presence the P25 (TiO₂) and the PC500 (TiO₂). The degradation rates were influenced by both TiO₂ and the lamps (UVC/UVA). Both P25 and UVA light were the most effective. Both pseudo-first-order and Langmuir-Hinshelwood models described accurately the dye degradation. The biodegradability of the solution was enhanced by photocatalytic treatment. The performance of the system was reached after completion of the hydrodynamic study of the installation by optimising the solution circulation rate. Hydrodynamic modelling was conducted using the residence time distribution program. The parameters derived from the RTD model were compared with those determined experimentally and used to diagnose hydrodynamic conditions. The results showed that the reactor is an arrangement of both one plug flow reactor followed by one stirred tank.

Keywords: water treatment; azo dye; biological treatment; titanium dioxide; photocatalysis; mineralisation.

DOI: 10.1504/IJEWM.2019.099993

International Journal of Environment and Waste Management, 2019 Vol.23 No.4, pp.370 - 395

Accepted: 24 Sep 2018
Published online: 03 Jun 2019 *

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