1. Kinetic study of defluoridation of drinking water by electrocoagulation/electroflotation in a stirred tank reactor and in an external-loop airlift reactor
- Author
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A.H. Essadki, Henri Delmas, B. Gourich, M. Azzi, Christophe Vial, Ecole Supérieure de Technologie de Casablanca (ESTC), Laboratoire d'électrochimie et chimie de l'environnement [Casablanca], Faculté des Sciences Aïn Chock [Casablanca] (FSAC), Université Hassan II [Casablanca] (UH2MC)-Université Hassan II [Casablanca] (UH2MC), Laboratoire de Génie Chimique et Biochimique (LGCB), Université Blaise Pascal - Clermont-Ferrand 2 (UBP), Laboratoire de Génie Chimique (LGC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Agence de l'Environnement et de la Maîtrise de l'Energie - ADEME (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Clermont-Ferrand - ENSCCF (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Hassan II Casablanca - UH2C (MOROCCO), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), and Laboratoire d'Electrochimie et Chimie de l'Environnement (Casablanca, Morocco)
- Subjects
[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn] ,Energie électrique ,Defluoridation ,General Chemical Engineering ,medicine.medical_treatment ,Mixing (process engineering) ,Continuous stirred-tank reactor ,Kinetic energy ,Industrial and Manufacturing Engineering ,Electrocoagulation ,chemistry.chemical_compound ,Adsorption ,Adsorption kinetics ,[CHIM.GENI]Chemical Sciences/Chemical engineering ,Mass transfer ,medicine ,Environmental Chemistry ,Génie chimique ,Dynamique des Fluides ,[SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Environmental engineering ,Milieux fluides et réactifs ,General Chemistry ,Langmuir–Freundlich isotherm ,Electroflotation ,Chemical engineering ,chemistry ,Volume (thermodynamics) ,Fluoride - Abstract
International audience; A kinetic study of defluoridation of drinking water was carried out using the electrocoagulation/electroflotation process in two batch reactors of identical volume (20 L): a stirred tank reactor (STR) and an external-loop airlift reactor (ELALR). When the evolution of fluoride content was independent of stirring speed, experimental results showed that the kinetics of fluoride removal could be modelled using a variable-order-kinetic (VOK) approach coupled with a Langmuir–Freundlich adsorption model in the STR. Conversely, when mixing was less efficient, which is the case in the ELALR, experimental data could be fitted adequately only using a pseudo-first-order model. This constitutes however only an empirical approach based on a lumped parameter that accounts simultaneously for mass transfer, adsorption and electrochemical steps. In this case, only regression analysis could be used to establish a quantitative relationship between the kinetic constant and the operating conditions, such as current density and initial fluoride concentration.
- Published
- 2010
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