Yazar "Gundogdu, Hilal" seçeneğine göre listele

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    Advanced electrocoagulation using aluminum electrodes supported by persulfate for the treatment of a high-strength wastewater
    (Elsevier, 2023) Yokus, Senem; Bilgin, Oyku Nur; Yilmaz, Ezgi Unal; Gundogdu, Hilal; Guvenc, Senem Yazici; Can-Guven, Emine; Varank, Gamze
    In this study, the treatment of leachate nanofiltration (NF) concentrate, which is high -strength wastewater, by advanced electrocoagulation (EC) was investigated. The EC pro-cess, in which aluminum electrodes were used, was enhanced by persulfate (PS) addition (EC-PS). First, the control experiments were conducted then the operating parameters of the process were optimized by the Box-Behnken design. Process variables were PS dose, applied current, initial pH, and reaction time while chemical oxygen demand (COD), total organic carbon (TOC), UV254, and color removal were the system responses. COD, TOC, UV254, and color removal efficiencies by the validation studies performed under optimized conditions (PS dose: 0.590 g/L; applied current: 0.710 A; initial pH: 5, and reaction time: 31.4 min) were 62.6%, 54.3%, 74.2%, and 88.0%, respectively. Based on the degree of effect on COD and TOC removal, statistical analysis parameters can be listed as linear, quad-ratic, and interactive from higher to lower one. The linear parameters can be listed as initial pH, applied current, reaction time, and PS dose according to the level of their effect on removal efficiencies. Quenching experiments showed that sulfate and hydroxyl radi-cals work together in the process while hydroxyl radicals were more effective. The specific energy consumption and total cost of the process under optimized operating conditions were 1.90 kWh/kg COD and 1.40 $/m3 respectively. By obtaining the spectrum of the sludge formed under optimum process conditions by Fourier Transform Infrared Spectroscopy analysis, the characteristics of the sludge were determined and Al hydroxides and hy-drocarbons were present in the sludge. (c) 2023 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.
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    Effective treatment of textile industry wastewater by combined ultraviolet assisted and Fe2+ catalyzed percarbonate oxidation
    (Taylor and Francis Ltd., 2024) Unal Yilmaz, Ezgi; Gundogdu, Hilal; Ersoz, Öykü Nur; Yokus, Senem; Türk, Oruç Kaan; Yazici Guvenc, Senem; Can-Güven, Emine
    Sustainable water management is very important for industries with high water consumption and wastewater generation, such as the textile industry. This study aims to investigate the treatment of textile wastewater with ultraviolet (UV) assisted and Fe2+ catalyzed sodium percarbonate (SPC) oxidation, which is an eco-friendly treatment method in terms of both added oxidant and activation methods. Based on the removal efficiencies and reaction rates, a sorting was made as UV/SPC/Fe2+ > SPC/Fe2+ > UV/Fe2+ > UV/SPC > SPC > UV. It was observed that the removal efficiencies increased as the SPC dose increased, and decreased due to the scavenging effect with the 5 g/L oxidant dose, and the optimum SPC dose was determined as 2.5 g/L. It was determined that the removal efficiencies were higher in acidic conditions and high UV power applications. Under optimum operating conditions (pH:3, SPC dose: 2.5 g/L, Fe2+ dose: 1 g/L, UV lamps: 4), 68% COD, 80.9% UV254, and 92% color removal were achieved. Under optimum conditions energy cost, chemical cost, and operational cost were calculated as 11.9 $/m3, 0.20 $/m3, and 12.1 $/m3, respectively. By reducing the process COD concentration to 236.2 mg/L, discharge standards have been achieved, and the applicability of the UV/SPC/Fe2+ process was proven. © 2023 Taylor & Francis Group, LLC.
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    Treatment of cosmetic industry wastewater with boron doped diamond, platinum and metal oxide electrodes in electrooxidation process
    (Pamukkale Univ, 2024) Can, Orhan Taner; Gundogdu, Hilal; Keyikoglu, Ramazan; Elibol, Pinar Sevim; Aygun, Ahmet; Isleyen, Mehmet
    In this study, treatability of cosmetic wastewater consist high pollution by electrooxidation process was investigated using three different anodes. For this purpose, BDD (Boron Doped Diamond), Pt and RuO2- IrO2 metal -oxide electrodes were used. The total organic carbon (TOC) removal efficiency of each electrode was determined and results were compared. After 120 min of operating time, the TOC removal efficiencies of BDD anode were obtained as 31.6%, 57.8% and 68%; Pt anode were obtained as 25%, 36.5% and 48%; RuO2-IrO2 metal -oxide anode were obtained as 22.6%, 29.8% and 42.6% respectively for 0.5, 1 and 1.5 ampere currents. It is observed that TOC removal efficiency increases with time for all electrodes throughout the operation time. The results showed that BDD electrode provided the best removal efficiency and this efficiency increased by the time of progress. After 120 min of operating time, the best TOC removal efficiencies of BDD, Pt and RuO2-IrO2 metaloxides electrodes were 68%, 48% and 42.6% respectively for 1.5 ampere.