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Boron Removal by Electrocoagulation Using Full Factorial Design

Journal of Water Resource and Protection 2013年第9期5卷 867-875页

作者： Khaoula Missaoui Wided Bouguerra chiraz hannachi Béchir Hamrouni UR11ES17 Traitement et Dessalement des Eaux Faculté des Sciences de Tunis Université de Tunis El Manar Tunis Tunisie

Saline waters treatment has become increasingly important for drinking water supply in a greater part of the world. However, some serious limitations had recently been discovered during water treatment, among them the boron problem seems to have a critical meaning. According to the WHO regulations (2011), the boron concentration should be reduced to less than 2.4 mg/L for drinking water. The purpose of this study is to investigate the feasibility of electrocoagulation (EC) as a pretreatment process to remove boron from saline waters. To optimize the experimental conditions of boron removal, the effects of some parameters were studied such as inter-electrode distance (die), electrode connection mode, (S/V) ratio, pHi and initial conductivity of the solution (σi). Subsequently, an experimental design methodology was implemented to evaluate statistically the most significant operating parameters. The effects of current density, EC time and initial boron concentration and their mutual interaction were investigated using 23 full factorial design. At optimal conditions, boron removal from synthetic aqueous solutions containing initial boron concentrations of 5 and 50 mg/L reached 81% and 79%, respectively. Applied to boron removal from seawater samples, EC reduces boron concentration to less to 2.4 mg/L with excessive energy consumption under optimal parameters.

关键词： Boron Removal Electrocoagulation Full Factorial Design

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Adsorption of F-, NO3-and SO42-on AFN Anionic Membrane: Kinetics and Thermodynamics Studies

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American Journal of Analytical Chemistry 2013年第9期4卷 501-509页

作者： chiraz hannachi Fatma Guesmi Wided Bouguerra Bèchir Hamrouni UR Traitement et Dessalement des Eaux Faculté des Sciences de Tunis Université de Tunis El Manar Manar II Tunisie

The sorption of and from aqueous solution on AFN membrane has been studied and the equilibrium isotherms determined. The experimental data have been analyzed using the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models at different temperatures varying from 283 to 313 K. The results were analyzed using three kinetic models, Lagergen first order, second order and the Elovich model. The obtained results show that the best-fit correlation of the experimental data was obtained using the second order model. Thermodynamic parameters for the adsorption system were determined at 283, 298 and 313 K.

关键词： AFN Membrane Adsorption Isotherm Kinetic Models Thermodynamics Parameters

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Ion Exchange Equilibrium between DOWEX 1X8 Resin Modified by Polyethyleneimine and Electrolyte Solutions

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Journal of Water Resource and Protection 2013年第11期5卷 1059-1065页

作者： chiraz hannachi Fatma Guesmi Khaoula Missaoui Hana Tounakti Béchir Hamrouni UR Traitement et Dessalement des Eaux Faculté des Sciences de Tunis Université de Tunis El Manar Manar II Tunisie

In order to improve the selectivity of anion exchange resin, the surface of gel type anion exchange resin was modified with polyethyleneimine (PEI). In the proposed work an attempt to the utilization of commercial anion exchange resin modified by adsorption of polyethyleneimine was investigated. Many conditions of modification of anion exchange resin surface were studied. The influent parameters on the DOWEX 1X8 resin modification were determined using a factorial experimental design. The ion exchange reactions were studied for modified and unmodified resin and electrolyte solutions containing Cl-,NO3-,SO42-. All experiments were performed at constant ionic strength I = 0.3 mol·L-1 and constant temperature T = 298 K. Ionic exchange isotherms were established for the binary systems:Cl-/NO3-,Cl-/SO42- and NO3-/SO42-. The obtained results show that nitrate ion was more sorbed than chloride and sulfate. The order of preference for the anions studied in this investigation is:NO3->Cl->SO42-. All the results given by this resin were compared with those obtained with the AMX anion exchange membrane. Selectivity coefficients and thermodynamic constants for the three binary systems and for the two resins were determined. The modified resin became more selective towards monovalent anions.

关键词： Resin Modification Polyethyleneimine Factorial Design Binary System Isotherm Selectivity Coefficient

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