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GAZİGİL, LEYLA

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GAZİGİL

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LEYLA

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    Publication
    Determination of the optimum conditions for electrochemical regeneration of exhausted activated carbon
    (Elsevier, 2023-02-02) Gazigil, Leyla; Er, Eren; Yonar, Taner; GAZİGİL, LEYLA; Er, Eren; YONAR, TANER; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Çevre Mühendisliği Bölümü; 0000-0001-8139-1338; 0000-0002-8798-8933; AAY-9420-2020; AAX-9798-2021; AAD-9468-2019
    In this study, the electrochemical regeneration of activated carbon used to soften the mains water in the batch system was investigated. The experimental data obtained were used to test the Freundlich and Langmuir isotherm models and it was seen that the experimental results showed good agreement with the Langmuir isotherm. To determine the optimum conditions; electrolyte type, electrolyte concentration, current density, electrolyte pH and regeneration time parameters were optimized. To evaluate the performance of activated carbon after electrochemical regeneration, adsorption tests with methylene blue (MB) were performed. The best removal efficiency was obtained with 0.1 M NaBr, 50 mA/cm2, 13 g activated carbon (AC) and 200 mL electrolyte volume. In the research, Sn/Sb/Ni-Ti cube was chosen as the anode and Pt/Ti as the cathode. After the ideal conditions for the electrochemical regeneration of AC were determined, the adsorption-regeneration cycle was carried out. As a result, it has been found that AC can be effectively recycled up to 6 times. While the removal efficiency was 98.78 % after the first cycle, the removal efficiency was calculated as 68.55 % in the last cycle. In addition, 1.3 kWh/kg electrical energy consumption was obtained under optimum conditions in the research.
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    Publication
    Electro-oxidation of indigo blue aqueous solution for COD and color removal: RSM optimization and pilot-scale study
    (Springer, 2023-08-18) Er, Eren; Gazigil, Leyla; Yonar, Taner; Er, Eren; GAZİGİL, LEYLA; YONAR, TANER; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Çevre Mühendisliği Bölümü; 0000-0001-8139-1338; 0000-0002-8798-8933; AAY-9420-2020; AAX-9798-2021; AAD-9468-2019
    In this study, the removal of indigo dye, which is used in the denim industry, by using the electro-oxidation method was investigated. Experiments were carried out using Sn/Sb/Ni-Ti anode and Pt-Ti cathode electrodes of indigo dye aqueous solution with an initial concentration of 100 mg/L, which was prepared synthetically in the laboratory. In the first stage of the study, appropriate support electrolyte (NaCl, KCl, Na2SO4, K2SO4) detection investigations were carried out. As a result of the trials, NaCl electrolyte was chosen as the supporting electrolyte type because it is both affordable and has high removal efficiency compared to other electrolytes. Color and COD removal were established according to the effective factors (pH, current density, supporting electrolyte concentration and electro-oxidation time) for the electro-oxidation method using the central composite design (CCD) based response surface methodology (RSM). The design consists of four components and seven central experiments, each with three levels. According to the RSM result, ideal conditions were pH 11, current density 51.01 mA/cm(2), supporting electrolyte concentration 1565.66 mg/L and duration 120 min. In ideal conditions, COD removal was determined as 97.43% and color removal as 98.93%, while energy consumption was determined as 17.49 kWh/kg COD. In the last stage of the study, pilot-scale tests were carried out in a spherical polyethylene (PE) tank with a bottom diameter of 65 cm and a height of 157 cm. Color and COD removal efficiencies obtained from the pilot scale under optimum conditions were calculated as 95.26% and 92.16%, respectively.
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    Publication
    Pilot-scale test results of electrodialysis bipolar membrane for reverse-osmosis concentrate recovery
    (Mdpi, 2022-01-01) Kestioğlu, O. Erdem; Gazigil, Leyla; GAZİGİL, LEYLA; Er, Eren; Yonar, Taner; YONAR, TANER; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Çevre Mühendisliği Bölümü.; 0000-0001-8139-1338; AAX-9798-2021; AEA-5887-2022; AAY-9420-2020
    In this study, it is aimed to investigate the potential of electrodialysis bipolar membrane (EDBM) systems for the recovery of the concentrate originating from an organized industrial estate (OIE) wastewater treatment system with reverse osmosis (RO). Acids and bases were obtained from a pilot-scale treatment plant as a result of the research. Furthermore, the sustainability and affordability of acids and bases obtained by EDBM systems were investigated. Six cycles were carried out in continuous-flow mode with the EDBM system as batch cycles in the disposal of the concentrate and the production of acids and bases with the EDBM system. For each cycle, the EDBM system was operated for 66, 48, 66, and 80 min, respectively, and the last two cycles were operated for a total of 165 min (70 + 90) with 5 min of waiting. In the EDBM system, a working method was determined such that the cycle flow rate was 180 L/hour, energy to be given to the system was 25 V, and the working pressure was in the range of 0.8-2.5 bar. In the six cycles with the EDBM system, the concentrate, acid and base, conductivity, pH, and pressure increase values were investigated depending on time. Throughout all these studies, the cycles were continued over the products formed in the acid and base chamber. As a result of all the cycles, acid (HCl) production at a level of 1.44% and base (NaOH) production at a level of 2% were obtained.