Yazar "Irdemez, Sahset" seçeneğine göre listele

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    Comparison of Bomaplex Blue CR-L Removal by Adsorption Using Raw and Activated Pumpkin Seed Shells
    (Sciendo, 2022) Irdemez, Sahset; Ozyay, Gizem; Ekmekyapar Torun, Fatma; Kul, Sinan; Bingul, Zuleyha
    In this study, removal of colour from wastewaters prepared synthetically using Bomaplex Blue CR-L was investigated using raw and activated pumpkin seed shells by adsorption in a batch system. The effects of stirring speed, adsorbent concentration, dye concentration, temperature and pH on colour removal were investigated, and adsorption capacities of raw and activated pumpkin seed shells were determined. In addition, adsorption kinetics, isotherm coefficients, activation energies and thermodynamic parameters were calculated. The optimal adsorption conditions were determined as pH = 2, stirring speed of 200 rpm, adsorbent concentration of 10 g L-1 and 30 degrees C. Under the optimal conditions, the maximum removal efficiency of Bomaplex Blue CR-L using raw pumpkin seed shells was 73.01 %. This value rose to 79.71 % after activation processing was applied. Experimental adsorption data show that the adsorption is more suited to the Langmuir adsorption model and works in accordance with the pseudo-first-order kinetics model. As a result of thermodynamic research, Delta H degrees and Delta S degrees were 31.515 kJ mol(-1) and 109.952 kJ mol(-1) K-1 for the raw adsorbent, respectively. For the activated adsorbent, Delta H degrees and Delta S degrees were 43.118 kJ mol(-1) and 152.237 kJ mol(-1) K-1, respectively. The activation energy of adsorption was calculated as 10.918 kJ mol(-1) for the raw adsorbent and 9.882 kJ mol(-1) for the activated adsorbent.
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    Comparison of kinetics of Cr (III) ions removal from wastewater using raw and activated montmorillonite minerals
    (Univ Studi Bologna, Dept Agricultural Sciences, 2021) Irdemez, Sahset; Durmus, Gul; Kul, Sinan; Torun, Fatma Ekmekyapar; Bingul, Zuleyha
    In this study, kinetics of the removal of Cr (III) from the waters by adsorption have been investigated using montmorillonite natural clay that was obtained from the vicinity of Narman, Erzurum in Turkey. Activation energy, thermodynamic values and adsorption kinetics were determined. In addition, the trials were repeated by subjecting to the same adsorbent activation process. The values found for these two adsorbents were compared. As a result of the experiments, the parameters affecting the adsorption kinetics were examined. It was determined that the adsorption process could be best depicted by pseudo second order reaction kinetics. Using pseudo second order reaction rate constants, Delta H degrees = -25.791 kJ mol(-1) and Delta S degrees = 106.19 joule mol(-1) were calculated for raw adsorbent. For the activated adsorbent, Delta H degrees = -18,806 kJ mol(-1) and Delta S degrees = 79.37 joule mol(-1) were calculated. That Delta G degrees increases as temperature increases indicates; adsorption is more spontaneous at high temperatures. Negative Delta H degrees values show that the reaction is exothermic. The positive values of Delta S degrees indicate increased randomness at the adsorbent/solution interface during the adsorption of chrome.
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    DETERMINATION OF PARAMETERS AFFECTING KINETIC AND THERMODYNAMIC VALUES FOR LEAD REMOVAL USING WASTEWATER TREATMENT PLANT SEWAGE SLUDGE ASH
    (Chem Soc Ethiopia, 2022) Irdemez, Sahset; Yesilyurt, Duygu; Torun, Fatma Ekmekyapar; Kul, Sinan
    In this study, treatment of lead containing wastewater using sewage sludge ash obtained from the incineration unit in the domestic wastewater treatment plant in Gaziantep province in Turkey was investigated. The main purpose of the study is to determine the potential of using the treatment sludge ash, which comes out as waste in the treatment plant, in the treatment of wastewater of another industry. As a result of this study, the most suitable adsorption conditions were determined and focused on the kinetics of adsorption. In the experiments, the lead adsorption capacity of sewage sludge ash was determined as 122 mg g-1 at 0.5 g L-1 adsorbent concentration in wastewater containing 100 mg L-1 Pb2+under optimum conditions. As a result of the research, it was determined that the adsorption reaction proceeds according to the pseudo second degree reaction and is suitable for the Langmuir isotherm. As thermodynamic constants, & UDelta;H & DEG; = 7.407 kJ mol-1 and & UDelta;S & DEG; = 33.25 J mol-1 were determined. As a result of this, it was determined that the adsorption reaction was endothermic, spontaneous and random, and adsorption was physical adsorption. The results show that sewage sludge ash can be used in the treatment of water containing high concentrations of Pb2+.
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    Investigation of Manganese Ion Removal from Waters Using Sewage Sludge Ash
    (Jihad Daneshgahi, 2022) Irdemez, Sahset; Yesilyurt, Duygu; Torun, Fatma Ekmekyapar; Kul, Sinan; Bingul, Zuleyha
    In this study, the removal of Mn2+ ions from waters by the adsorption method using ash obtained from a treatment plant sludge burning unit, which is treatment plant waste and mostly disposed of in a landfill, was investigated. By determining the most suitable conditions for adsorption, adsorption kinetics, isotherms, and thermodynamic values were determined. In the experiments, 63.9% removal efficiency was achieved using 10 g/L adsorbent concentration for 10 mg/L Mn+2 under optimum conditions. As a result of the research, it was determined that the adsorption proceeds according to the pseudo-second-degree reaction and abides by the Langmuir isotherm. The thermodynamic constants of Delta H degrees= -4.866 kJ/mol and Delta S degrees= 21.44 J/mol were determined. As a result of this, the reaction was exothermic, spontaneous, and random, and adsorption was physical adsorption. As a result of the study, sewage sludge ash can be used in the treatment of water containing low concentrations of Mn2+ .
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    Investigation of organic and inorganic matters removal from tannery wastewater using iron plate electrode by electrocoagulation process
    (Taylor & Francis Ltd, 2023) Bingul, Zuleyha; Irdemez, Sahset; Kul, Sinan; Ekmekyapar Torun, Fatma; Demircioglu, Nuhi
    In this study, COD, turbidity, total nitrogen, phosphate, sulphate, oil-grease and chromium removals from wastewaters taken from a local tannery using the electrocoagulation process were examined and the most suitable parameters for the electrocoagulation system were tried to be determined. Soluble iron plate electrodes were used as electrodes in the experiments. As a result of the studies carried out, the most suitable initial pH in uncontrolled pH was determined as pH = 4 and for controlled pH as pH = 5. In studies, the most suitable current density for iron electrodes was determined as 1.2 mA cm(-2). Even if the increase in current density increased the amount of dissolved Fe, it negatively affected the removal efficiency. In addition, the turbidity of the wastewater was removed in 30 minutes, phosphate in 20 minutes and chromium in 15 minutes by 100%. During 60 minutes of operation, while 62.91% of TN, 87.8% of oil-grease were removed, sulphate was removed at the rate of 54.78%. In the studies, 1st and 2nd order kinetic equations for COD removal were examined and it was determined that removal kinetic is more suitable for 2nd order kinetics.
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    Investigation of the effect of current density and PH on oil and grease removal from leather industry wastewaters by electrocoagulation method
    (Yildiz Technical Univ, 2022) Bingul Recber, Zuleyha; Ekmekyapar Torun, Fatma; Kul, Sinan; Irdemez, Sahset
    In this study, the effects of pH and current density on the removal of high concentrations of oil and grease in leather industry wastewater by the electrocoagulation method were investigated. Two different types of electrodes were used in the study. Studies with aluminum electrodes have shown that these electrodes are more effective than iron electrodes in removing oil and grease. In addition, aluminum electrodes are affected more by the system pH than iron electrodes. Studies have shown that higher oil and grease removal efficiencies are obtained below pH 4 for both electrodes. While the oil and grease removal efficiency with Al electrodes is 95% at pH 2, this value decreases to 83% at pH 6. In Fe electrodes, while the removal efficiency is 87.83% at pH 2, it decreases to 83% at pH 6. The effect of current density on oil and grease removal was examined and it was observed that the removal efficiency remained constant above a certain current density in aluminum electrodes. While the efficiency of Al electrodes is 83.31% at 0.6 mA cm(-2) current density, this value has increased to about 98% at 1.2, 1.8, and 2.4 mA cm(-2) current densities. In Fe electrodes, the oil and grease removal efficiency is 82.66% at 0.6 mA cm(-2) current density, while it is 90% at 1.2 and 1.8 mA cm(-2) current densities and 98% at 2.4 mA cm(-2). These results show that the electrocoagulation process removes the oil and grease in wastewater at a high rate. This shows that this process can also be used as pre-treatment before the biological treatment of industrial wastewater with high oil and grease content.