Browsing by Author "KERBOUA Kaouther"

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    A Numerical Study of the Efficiency of the Sono Galvano-Fenton Process as a Tertiary Treatment Technique for the Wastewater Reuse in Agriculture
    (The Eurasia Proceedings of Science, Technology, Engineering & Mathematics (EPSTEM), 2023) KERBOUA Kaouther
    In the present study, the Sono-Galvano-Fenton process is studied numerically as a tertiary treatment process for treated wastewater reuse in irrigation, with in situ generation of the Fenton’s reagent and catalyst, i.e., H2O2 and Fe2+. The sonochemical pathway is examined as a source of hydrogen peroxide under the pre optimized condition of acoustic frequency, 200 kHz. The macroscopic model accounting for the performance of the single acoustic cavitation bubble and the bubble population density is combined with the Fe/Cu galvanic cell operating in acidic conditions (pH 3), following a cumulative and instantaneous production approach in terms of Fenton’s reagent. The combination is optimized based on the rate of hydroxyl radicals generated by the Galvano-Fenton process, as a non-selective powerful oxidant against recalcitrant pollutants, then considering the synergetic effect of the hybrid process in terms of HO● pumped sonochemically and via the Fenton based pathway, treated using simulations of the isolated processes then their combined configuration following both aforementioned approaches
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    Acoustic Cavitation and Ionic Liquid Combined: A Modeling Investigation of the Possible Promises in Terms of Physico-Chemical Effects †
    (Engineering. Proceedings, 2023) KERBOUA Kaouther
    The present work is based on a mathematical model describing a single acoustic cavitation bubble oscillating under an ultrasonic field of 200 and 300 kHz and an acoustic amplitude of 1.8 atm within 1-butyl-3-methylimidazolium acetate. The model integrates the dynamics of bubble oscillation, the thermodynamics applied to the interior of the bubble and at its interface, and the sonophysical and sonochemical events occurring in the presence of dissolved cellulose in the ionic liquid. The performed simulations shed light on the major physical effects of acoustic cavitation, namely the shockwave and microjet, as well as the sonochemical effects in terms of the degradation rate of the dissolved cellulose in the secondary reactional site, i.e., the interface. The predominance of the effects and its dependency of the acoustic frequency is tackled from an energetic point of view. It is demonstrated that 300 kHz offers the lowest heat flow across the bubble interface, lowering the chances for the sonochemical degradation of cellulose, while 200 kHz offers a significant degradation rate, attaining 71.4 mol·dm−3·s−1, as well as harsher microjets and shockwaves with powers of 3300 and 900 mWatcollapse, respectively
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    PV Supplied Electrochemical Production of Hydrogen Peroxide: A Green Pathway for Fenton Based Advanced Oxidation Processes
    (The Eurasia Proceedings of Science, Technology, Engineering & Mathematics (EPSTEM), 2023) KERBOUA Kaouther
    Hydrogen peroxide is the common reagent of the Fenton Based advanced oxidation processes, it is generally added in stochiometric yields to the Fenton catalyst (Ferrous or ferric ions) to produce hydroxyl radicals. In the present study, a green technique for the in-situ production of hydrogen peroxide is examined numerically, using modelling and simulation, based on PV supplied electrochemical process and carbon-based electrodes. The PV supply model is based on Maximum Power Point Tracking using ET-Solar M53640 panel, while the modelling of the performance of the electrochemical cell is based on an electrical equivalent schema of activation, ohmic, and concentration resistances. Two production pathways of hydrogen peroxide under acidic conditions are considered, namely the reduction of O2 and the oxidation of H2O. The performed simulations under 3 scenarios of solar radiation (low, middle and high) demonstrated that 300 W/m2 of incident global radiation results in 0.35 A of feeding current, against 0.88 A under 600 W/m2 and 1.41 A under 900 W/m2. Simulations for hydrogen peroxide production under the three scenarios have been compared based on the O2 reduction pathway, which is proved to be more performant, especially with the lower H2O2 cathodic decomposition.
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    Water Remediation from Recalcitrant Pollution Using the Galvano-Fenton Process: A Modeling Approach of the Hydroxyl Radical Generation and the Energy Efficiency
    (The Eurasia Proceedings of Science, Technology, Engineering & Mathematics (EPSTEM), 2022) KERBOUA Kaouther
    The hydroxyl radical is the most powerful oxidant after fluorine, and is the key reactant of the advanced oxidation processes AOP. Monitoring the kinetics of formation and reaction of this short life species is one of the challenging tasks from an experimental point of view. Thus, modelling is suggested to be one efficient tool for a comprehensive and predictive study of AOPs, particularly the Galvano-Fenton process. In the present study, mathematical modelling is used to describe the kinetics of hydroxyl radical 𝐻𝑂• generation and organic substrate 𝑅𝑂 degradation within the Galvano-Fenton process, based on the spontaneous galvanic corrosion of iron waste and in situ ferrous ion catalyst generation. A range of typical absolute kinetic constants of 106 à 1010 M-1.s-1 is considered to characterize the attack of 𝑅𝑂 species by 𝐻𝑂•. Phenol is presented as a model pollutant for a total mineralization model. The numerical simulations demonstration a quasi-linear evolution of hydroxyl radical production during the first stage of the Galvano-Fenton process. A comparison of the Galvano-Fenton process with the classic Fenton in terms of kinetics, and electro-Fenton in terms of energetic performance, revealed that the spontaneous galvanic generation of ferrous ions in the Galvano-Fenton process leads to a higher rate of the reaction a higher instantaneous concentration of ferric ions accompanying the release of hydroxyl radicals and hence a better oxidation efficiency, as well as a positive energy balance. A particular attention was given to the ratio of the degradation efficiency to the released energy