Browsing by Author "Yilmaz, Alper Erdem"

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Adsorption of Methyl Violet Dye a Textile Industry Effluent Onto Montmorillonite-Batch Study
(Taylor & Francis inc, 2014) Aladag, Erdinc; Fil, Baybars Ali; Boncukcuoglu, Recep; Sozudogru, Onur; Yilmaz, Alper Erdem
In this study, methyl violet (MV) dye adsorption from synthetically prepared solutions onto montmorillonite was investigated. Experimental parameters were selected as stirring speed, adsorbent dosage, initial dyestuff concentration, initial solution pH, ionic strength, and temperature. It was determined that adsorption rate increased with increased stirring speed, initial dye concentration, solution pH, ionic strength, and temperature, but decreased with increased adsorbent dosage. The experimental data were analyzed by Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms, and it was found that the isotherm data were reasonably correlated by Langmuir isotherm. Maximum adsorption capacity of montmorillonite for MV dye was calculated as 230.04 mg g(-1). Pseudo-first-order, pseudo-second-order, Elovich, and intraparticle particle diffusion models were used to fit the experimental data. Pseudo-second-order rate equation provided realistic description of adsorption kinetics. Thermodynamic parameters were calculated as 62.14 kJ mol(-1), 59.55 kJ mol(-1), 51.98 kJ mol(-1), and 0.0242 kJ mol(-1) K-1 for Ea, Delta H*, Delta G*, and Delta S* at 293 K, respectively. The value of the calculated parameters indicated that the physical adsorption of MV on the clay was dominant and the adsorption process was also endothermic. The positive values of Delta S degrees suggest the increased randomness. The positive Delta G degrees value indicated the un-spontaneous nature of the adsorption model.
Treatment of Slaughterhouse Wastewater With the Electrochemical Oxidation Process: Role of Operating Parameters on Treatment Efficiency and Energy Consumption
(Elsevier, 2019) Ozturk, Dilara; Yilmaz, Alper Erdem
In this study, investigation of the applicability and efficiency of electrochemical oxidation (EO) processes for slaughterhouse wastewater was targeted by evaluating the treatment efficiency and energy consumption values together. The effect of operating parameters such as type of supporting electrolyte (SE) (Na2SO4, NaNO3 and NaCl), concentration of SE (0.01-0.1 M), initial wastewater pH (3-9), current density (CD) (4.73-14.20 mA/cm(2)) and dilution rate of wastewater (1/1-1/4) on removal of chemical oxygen demand (COD), total organic carbon (TOC), total nitrogen (TN), total suspended solids (TSS) and color were investigated. The most effective electrolyte type was observed as NaCl. With the use of 0.025 M NaCl and 25 degrees C reaction temperature, at fixed 4.73 mA/cm 2 CD and pH of 7.03 for 4 h reaction time, the optimum conditions for both energy consumption and removal efficiency for treatment of SWW were obtained. At optimum conditions, TSS, TOC, COD, TN and color removal efficiencies were found as; 99.5%, 88.0%, 92.2%, 93.5% and 99.9%, respectively, and the energy consumption under these conditions were 153.57 kWh/m(3) and 14.12 kWh/kg COD. The energy cost was calculated as 1.69 $/kg COD. Also, results distinctly show that almost full mineralization of organics is obtained after 4 h treatment. Unluckily, taking into account the large volumes of effluent produced per slaughtering cycle, the need for long treatment times is impractical, yet if the reactor is developed to include hydrodynamic conditions or combined with another treatment process which is shorter than the EO treatment time a novel setup may be possible.