Journal
CHEMICAL ENGINEERING JOURNAL
Volume 164, Issue 1, Pages 106-114Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.08.037
Keywords
Defluoridation; Electrocoagulation; Electroflotation; Adsorption kinetics; Langmuir-Freundlich isotherm
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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. (C) 2010 Elsevier BM. All rights reserved.
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