Yazar "Akkaya, Gulizar Kurtoglu" seçeneğine göre listele

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    An economical electrocoagulation process of a hazardous anionic azo dye wastewater with the combination of recycled electrodes and solar energy
    (Springer Heidelberg, 2023) Akkaya, Gulizar Kurtoglu; Polat, Gokhan; Nalcaci, Gamze; Eker, Yasin Ramazan
    The energy and electrode costs are the restrictions of applying electrocoagulation (EC) in wastewater treatment and many attempts have been made to decrease these costs. In this study, an economical EC was investigated to treat a hazardous anionic azo dye wastewater (DW) that threatens the environment and human health. Firstly, an electrode for EC process was produced from recycled aluminum cans (RACs) by remelting in an induction melting furnace. The performance of the RAC electrodes in the EC was evaluated for COD, color removal, and the EC operating parameters such as initial pH, current density (CD), and electrolysis time. Response surface methodology which is based on central composite design (RSM-CCD) was used for the optimization of the process parameters which were found to be pH 3.96, CD 15 mA/cm(2), and electrolysis time 45 min. The maximum COD and color removal values were determined as 98.87% and 99.07%, respectively. The characterization of electrodes and the EC sludge was conducted by XRD, SEM, and EDS analyses for the optimum variables. In addition, the corrosion test was conducted to determine the theoretical lifetime of the electrodes. The results showed that the RAC electrodes show an extended lifetime as compared to their counterparts. Secondly, the energy cost required to treat DW in the EC was aimed to decrease by using solar panels (PV), and the optimum number of PV for the EC was determined by the MATLAB/Simulink. Consequently, the EC with low treatment cost was proposed for the treatment of DW. An economical and efficient EC process for waste management and energy policies was investigated in the present study which will be instrumental in the emergence of new understandings.
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    Evaluating the performance of an electro-membrane bioreactor in treatment of young leachate
    (Elsevier Sci Ltd, 2020) Akkaya, Gulizar Kurtoglu; Bilgili, Mehmet Sinan
    Leachate generated from landfill, typically contains high amounts of different pollutions. Its composition may vary according to the origin and age of landfill. In this study, the performance of a laboratory-scale submerged electro-membrane bioreactor (SMEBR), an integrated process consisting of an electro-coagulation unit and a conventional submerged membrane bioreactor (SMBR) for treating young leachate was evaluated. SMEBR and SMBR as control reactor were operated simultaneously to compare. In SMEBR, perforated aluminum (Al) electrodes were used. SMEBR was operated under electrokinetic conditions at a current density of 24 mA/cm(2) for 50 days: at 180 s/day for 25 days (Stage I) and 360 s/day for 25 days (Stage II). Chemical oxygen demand (COD), ammonia nitrogen (NH3-N), color and metal removal performances were evaluated for both reactors. Also, the membrane fouling was examined by monitoring the change in transmembrane pressure over time. The concentration of dissolved oxygen (DO) was determined using the oxygen uptake rate in a period covering SMEBR operating conditions. Based on the results obtained, positive effects of electrical field SMEBR were clearly observed at Stage II. At the Stage II, the removal efficiency of COD was 6-15% higher in SMEBR compared to SMBR. The average NH3-N removal efficiencies in SMEBR and SMBR were 86 and 78%, respectively. Following the introduction of electrical current to SMEBR, DO concentrations were measured about 0.8 mg/L lower than SMBR; however, nitrification was not affected adversely. Additionally, chemical properties of SMEBR and SMBR membranes surfaces were characterized by using the Fourier-transform infrared spectroscopy.
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    Investigation of Leachate Characteristics in Field-Scale Landfill Test Cells
    (Springer International Publishing Ag, 2019) Top, Selin; Akkaya, Gulizar Kurtoglu; Demir, Ahmet; Yildiz, Senol; Balahorli, Vahit; Bilgili, Mehmet Sinan
    This paper evaluates leachate recirculation and the impact of aeration on waste decomposition rate by means of leachate quality and quantity in field-scale landfill test cells. Four landfill test cells with the dimensions of 20 m x 40 m x 5 m were constructed in Komurcuoda Sanitary Landfill, Istanbul, Turkey. Solid wastes representing Istanbul Asian side waste characteristics were landfilled in the test cells and the test cells were operated simulating anaerobic landfilling (AN-1), leachate-recirculated anaerobic landfilling (AN-2), semi-aerobic landfilling (A-1) and aerobic landfilling (A-2) methods. Alternative landfilling methods for accelerating solid waste stabilization in landfills were investigated by means of leachate quantity and quality. The study indicated that aeration (forced or natural) and leachate recirculation accelerate the biodegradation rate of the waste. High biodegradation rates of MSW eventually provide a reduction in the contaminant life span of the landfill and decrease the cost of long-term monitoring. Results show an important and rapid development in leachate quality with a reduction in the treatment costs in aerobic landfill sites. Many important advantages can thus be achieved especially in the aerobic or semi-aerobic landfill sites noting that leachate recirculation seems to be an effective solution to reduce the stabilization time and provide in situ treatment of leachate when the aerobic landfilling cannot be applicable.
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    A simple and green preparation of red mud-coated membrane for efficient separation of oil-in-water emulsions
    (Elsevier Sci Ltd, 2022) Turk, Bahri; Kazak, Omer; Akkaya, Gulizar Kurtoglu; Tor, Ali
    This study presented a novel, low-cost and environmentally-friendly underwater superoleophobic membrane for influential separation of oil-in-water emulsions. The membrane was prepared by single-step deposition of waste red mud with sodium alginate on the nitrocellulose support through a vacuum pumping. The red mud-coated membrane had a superamphiphilic characteristic in air, whereas it demonstrated an underwater superoleophobic feature with contact angle values above 159(+/- 2)degrees. The prepared membranes with different amount of red mud showed effective separation performance having rejection and flux values greater than (98.5% and 945 L/m(2) h; 99.1% and 1033 L/m(2) h; 93.7% and 1186 L/m(2) h; 99.8% and 1224 L/m(2) h; 99.9% and 1028 L/m(2) h) for emulsions of various oils and solvents (diesel, mineral oil, toluene, kerosene and petroleum ether)-in-water, respectively. The oil rejection and permeate flux remained stable at the end of 5 cycles of the emulsion separation and also in the corrosive solutions, including NaOH, HCl and NaCl at 0.5 M of each one. Consequently, the usage of waste red mud in the preparation of underwater superoleophobic membrane through the suggested way can be offered as economical, practical and environmentally benign option for both implementing the efficient separation of oil-in-water emulsions and reuse of the industrial by-products.
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    Sustainable and efficient removal of cationic, anionic and neutral dyes from water by pre-deposited vinasse biochar membrane
    (Elsevier Sci Ltd, 2023) Kazak, Omer; Akkaya, Gulizar Kurtoglu; Tor, Ali
    This study demonstrated a simple and sustainable approach for removing dyes from water through a new predeposited vinasse biochar (PDVB) membrane, which was developed by single-step deposition of vinasse biochar powder on a filter paper support via vacuum pumping. The PDVB membrane combined advantages of adsorption and membrane filtration processes in one-stage. Performance of the PDVB membranes with waterwettable surface was examined on methylene blue (as a model dye) solution as functions of pyrolysis temperature, amount of biochar on the membrane unit area, solution pH, initial concentration and temperature of dye solution in a dead-end filtration mode. The best performance (removal efficiency >99%, flux: 8017 L/(m2.h)) was obtained at a wide pH range (2-11) by using membrane (7.95 mg biochar/cm2, derived from pyrolysis of vinasse at 900 degrees C). Moreover, initial dye concentration and solution temperature had no considerable effect on membrane performance, which was stable even after ten cycles of filtration-regeneration by ethanol-washing. At pH 2, the membrane was also quite good at removing Congo red (anionic dye) with efficiency of 98%, which decreased when increasing pH from 2 to 11. Behavior of membrane towards dyes with different characteristics was explained by considering high surface area (756 m2/g) of the biochar and phenomenon, including aromatic stacking and electrostatic-attraction between dye molecule and biochar surface. All findings and application to a real textile industry effluent demonstrated that developed membrane was easy-to-use and sustainable material for effective treatment of water and wastewater containing dyes with different molecular weights and ionic characteristics.