Entity

Time filter

Source Type

Masākin, Tunisia

Brahmi K.,U. R Traitement et Dessalement des Eaux | Bouguerra W.,U. R Traitement et Dessalement des Eaux | Hamrouni B.,U. R Traitement et Dessalement des Eaux | Loungou M.,Groupe Chimique Tunisien
Desalination and Water Treatment | Year: 2015

Electrocoagulation (EC) is an efficient technique for cleaning waste water containing heavy metals before discharge in the environment. The performance of electro coagulation for zinc ions removal using aluminum electrodes was investigated in this paper. Several electrochemical parameters such as pH, current density, electrolyte doses, energy consumption, initial concentration, EC time, the state of the aluminum plates, and heavy metal ions concentration were studied in an attempt to achieve high zinc removal efficiency. Optimum conditions for zinc removal were found at a pH value of 7, a current density of 7.35 mA cm−2, an inter-electrode potential of 5 V, a conductivity of 5.3 mS cm−1, and an EC time of 30 min. These operating conditions can simultaneously achieve a good mix, good flotation, high flocs stability, and thus efficient removal in a relatively short reaction time and low cost with a removal percentage up to 98.96. The testing of zinc removal from industrial waste water showed that the removal by EC using aluminum electrodes was effective and the removal efficiency of zinc reached 100% in the first 5 min of treatment with a very low power consumption of 1.02 kW h m−3 for an initial pH over 5. In the light of these results, this method promises interesting industrial applications. © 2014 Balaban Desalination Publications. All rights reserved. Source


Bouguerra W.,U. R Traitement et Dessalement des Eaux | Brahmi K.,U. R Traitement et Dessalement des Eaux | Elaloui E.,Gafsa University | Loungou M.,Groupe Chimique Tunisien | Hamrouni B.,U. R Traitement et Dessalement des Eaux
Desalination and Water Treatment | Year: 2015

This study was carried out to investigate the effect of the electrocoagulation reactor design parameters in the removal of zinc from water. In order to optimize experimental electrocoagulation reactor parameters such as inter electrode distance (die), electrode connection mode, surface-area-to-volume ratio (S/V), and the initial temperature of the solution (T), many electrocoagulation tests were performed using aluminum electrodes. The obtained experimental results showed that optimal zinc removal was achieved with a distance between electrodes of 0.5 cm, a bipolar connection mode, the surface-area-to-volume ratio (S/V) of 13.6 m−1, and for an initial temperature (T) of 50°C. The application of these results on the treatment of a sulfuric acid and superphosphate manufacturing industry wastewater made it possible to achieve a total zinc removal in five minutes of electrolysis time. © 2015 Balaban Desalination Publications. All rights reserved. Source


Hentati H.,University of Sfax | Abdelmoula R.,University of Paris 13 | Maalej A.,University of Sfax | Maalej K.,Groupe Chimique Tunisien
Applied Mechanics and Materials | Year: 2012

Fracture mechanics has been revisited by proposing different models of quasi static brittle fracture. In this work, the problem of the quasi static crack propagation is based on variational approach. It requires no prior knowledge of the crack path or of its topology. Moreover, it is capable of modeling crack initiation. In the numerical experiments, we use a standard linear (P1) Lagrange finite element method for discretization. We perform numerical simulations of a piece of brittle material without initial crack. An alternate minimizations algorithm is used. Based on these numerical results, we determine the influence of numerical parameters on the evolution of energies and crack propagation. We show also the necessity of considering the kinetic term and the crack propagation becomes dynamic. © (2012) Trans Tech Publications, Switzerland. Source


Hentati H.,University of Sfax | Abdelmoula R.,University of Paris 13 | Maalej A.,University of Sfax | Maalej K.,Groupe Chimique Tunisien
Applied Mechanics and Materials | Year: 2012

Fracture mechanics has been revisited aimed at modeling brittle fracture based on Griffith viewpoint. The purpose of this work is to present a numerical computational method for solving the quasi static crack propagation based on the variational theory. It requires no prior knowledge of the crack path or of its topology. Moreover, it is capable of modeling crack initiation. At the numerical level, we use a standard linear (P1) Lagrange finite element method for space discretization. We perform numerical simulations of a piece of brittle material without initial crack. We show also the necessity of adding the backtracking algorithm to alternate minimizations algorithm to ensure the convergence of the alternate minimizations algorithm to a global minimizer. © (2012) Trans Tech Publications, Switzerland. Source


Bouguerra W.,Faculte des science de Tunis | Brahmi K.,Faculte des science de Tunis | Elaloui E.,Gafsa University | Loungou M.,Groupe Chimique Tunisien | Hamrouni B.,Faculte des science de Tunis
Desalination and Water Treatment | Year: 2015

This study was carried out to investigate the effect of the electrocoagulation reactor design parameters in the removal of zinc from water. In order to optimize experimental electrocoagulation reactor parameters such as inter electrode distance (die), electrode connection mode, surface-area-to-volume ratio (S/V), and the initial temperature of the solution (T), many electrocoagulation tests were performed using aluminum electrodes. The obtained experimental results showed that optimal zinc removal was achieved with a distance between electrodes of 0.5 cm, a bipolar connection mode, the surface-area-to-volume ratio (S/V) of 13.6 m−1, and for an initial temperature (T) of 50°C. The application of these results on the treatment of a sulfuric acid and superphosphate manufacturing industry wastewater made it possible to achieve a total zinc removal in five minutes of electrolysis time. © 2015 Balaban Desalination Publications. All rights reserved. Source

Discover hidden collaborations