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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.


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.


Khaled B.,U. R Traitement et Dessalement des Eaux | Wided B.,U. R Traitement et Dessalement des Eaux | Bechir H.,U. R Traitement et Dessalement des Eaux | Elimame E.,Gafsa University | And 2 more authors.
Arabian Journal of Chemistry | Year: 2015

This study investigates the effect of reactor design parameters on cadmium removal from industrial wastewater discharged by the Tunisian Chemical Group (TCG) to improve as much as possible efficiency and cost of electrocoagulation (EC) process. Based on an examination of the design parameters one by one, the best cadmium removal was achieved for an inter-electrode distance (d ie) of 0.5cm, monopolar connection mode, stirring speed of 300revmin-1, surface-area-to-volume ratio (S/V) of 13.6m-1, and an initial temperature of 50°C. These operating conditions are allowed to achieve efficient removal in a relatively short operating time with the lowest energy consumption and cost possible. The present study proved that the parameters that have an effect on the operating cost are the electrode configuration, inter-electrode distance and S/V ratio. The energy consumption, the pH evolution, and the treatment cost were studied. The investigation of the effect of all the selected optimum EC design parameters together on the removal of cadmium from the TCG wastewater proved that the treatment was highly efficient; 100% of cadmium removal was reached in 5min, with a very low power consumption (1.6kWhm-3) and very low cost (0.116TNDm-3). Moreover, EC was found to be capable of removing cadmium as well as other pollutants at the same time from the case-study industrial wastewater. The investigation carried out in this work explores and proposes a very cost-effective treatment method to remove heavy metals from industrial wastewater if compared to results reported about cost of this treatment process through other widely used technologies such as coagulation (4.36Tunisian National Dinar (TND)m-3) and precipitation (9.96TNDm-3) employed in previous studies. © 2015 The Authors.

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