Browsing by Author "OUARI Ikram"

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    Modelling and simulation of an integrated process for the valorisation of reverse osmosis brine
    (NATIONAL HIGHER SCHOOL OF TECHNOLOGY AND ENGINEERING -ANNABA, 2024) OUARI Ikram; HAMRAKROUHA Nesrine; KERBOUA Kaouther (Encadrant)
    The brine produced by desalination poses a threat to marine ecosystems because of its high salinity and chemical composition. Hybrid processes and the integration of renewable energies such as solar and wind power are used to optimize the transformation of brine into valuable products, while minimizing environmental degradation. Our project aims to develop a comprehensive mathematical model for the conversion of reverse osmosis brine into hydrochloric acid and hydrogen using PV-electrolysis. The model is validated experimentally and used to optimize the system through a parametric analysis. The obtained preliminary results with conventional power supply demonstrated a high correlation coefficient of 0.995 and also a high determination coefficient of 0.992, suggesting that the simulation model is highly accurate and reliable. The integration of the photovoltaic power supply and the study of the effects of cell temperature, global radiation and electrolyte concentration provided valuable information on system behavior under different conditions. It was found that ambient temperature is optimal for the performance of the membrane electrolyzer supplied by PV, while the highest performance was obtained with high values of solar radiation of 900 W/m². Regarding the concentration of the electrolyte, a concentration factor of 5 conducted to the highest the conductivity, making the electrolyte becomes richer in ions, thus lowering the resistance of the electrolyte and therefore the ohmic resistance in the electrolytic cell.
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    Recovery of acid and base from reverse osmosis brines: An electrochemical engineering solution adapted to UTE Desaladora Skikda station
    (NATIONAL HIGHER SCHOOL OF TECHNOLOGY AND ENGINEERING -ANNABA, 2024) OUARI Ikram; HAMRAKROUHA Nesrine; KERBOUA Kaouther (Encadrant)
    As demand for water increases, seawater desalination is becoming increasingly important, with reverse osmosis being the most commonly used method due to its high energy efficiency. However, the environmental impact of brine discharge is a challenge.The main objective of this project is to design an innovative modular device capable of simultaneously producing sodium hydroxide (NaOH) and hydrochloric acid (HCl) by an integrated process combining electrolysis and photochemical reaction, in partnership with UTE Desaladora desalination plant, Skikda. The system is adaptable to different production scales, starting with laboratory experiments. The work attempts through a parametric study to optimize the process using low-cost electrode materials while maintaining system efficiency and durability. The obtained results allowed the verification of the repeatability of the experiments of both electrolysis of synthetic brine and photochemical synthesis of hydrochloric acid, with a determination coefficient exceeding 92% and a correlation coefficient higher than 95%. The parametric analysis including feeding voltage, cell temperature, photoreactor stirring and electrolysis membrane type, demonstrated the existence of compromises between energy consumption and feeding current, as well as between the kinetic of the photochemical reaction and the dissolution of electrolytic gases in the reactor content. In terms of cell temperature, the positive effect attained a plateau at around 54°C, while N117 was the optimal separator for both synthetic and real brine recovered from the desalination station.