Browsing by Author "Otmanine, Ghazi"

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    Environmental Assessment and Compliance of Wastewater from Arzew Oil Refinery for Future Development and Reuse
    (2022) Ghezali, Katia; Ben Tahar, Nourredine; Otmanine, Ghazi; Guettaf, Naima
    To acquire baseline knowledge on the nature of effluent released into the environment from petroleum refineries in Algeria, and to find more interesting treatment options for industrial wastewaters, the characteristics of Arzew refinery effluent were investigated. Industrial wastewater samples were gathered from the influent, API separator, and discharged into the sea effluent, and then analyzed for different parameters using standard methods. The analysis showed high concentrations of total Suspended Solids (TSS), biological oxygen demand (BOD), chemical oxygen demand (COD), total petroleum hydrocarbons (TPH), and Oil and grease (O&G) contained in the influent wastewater, and reduced to acceptable limits in the discharged effluent based on the Algerian standards for industrial liquid effluents (including refineries). Heavy metals such as cadmium (Cd), copper (Cu), lead (Pb), iron (Fe), zinc (Zn), and total chromium (Cr) were also detected. The findings were compared with the liquid discharge standards of two other Algerian refineries regarding the regulation of liquid effluents from refineries. As a result of these investigations on the evaluation of wastewater treatment processes in the petroleum refinery sector in Algeria, suggestions are recommended for future research toward the development of advanced treatment technologies and the exploitation of recycling in petrochemical and refinery wastewater treatment plants.
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    Interaction of intermediates with transition metal surfaces in the dehydrogenation of ethanol to ethyl acetate: A theoretical investigation
    (SAGE Publications, 2019) Boualouache, Adel; Boucenna, Ali; Otmanine, Ghazi
    By employing a combined approach of the unity bond index–quadratic exponential potential method and density functional theory within the generalized gradient approximation, we have studied the interaction of intermediates in the ethanol dehydrogenation process to ethyl acetate on Cu, Ag, Ni, Pd, Pt, Co, Au and Ir(111) transition metal surfaces. Binding energies and geometries were optimized for the main intermediates of this process. Electronic structures were computed for some intermediates/transition metal systems. We also calculated the activation energies for the elementary steps of the reactions. The results show that amid the studied surfaces, Cu(111) stabilizes ethoxy and acetyl species, preventing their dissociation. Inducing the h2 binding mode of acetaldehyde by alloying Cu with Ni, Co, Pd, Pt or Ir can enhance the catalytic proprieties of the Cu(111) clean surface.
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    New upgrading options of heavy oil fractions from Algerian refineries
    (Taylor & Francis, 2016) Otmanine, Ghazi; Bentahar, Nouredine; Otmanine, Mohamed