Browsing by Author "Yilmaz, A. E."

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Electrochemical Mineralization of Abattoir Wastewater With Continuous System
(Springer, 2021) Ozturk, D.; Yilmaz, A. E.; Sapci Ayas, Z.
This study aims to determine the effects of initial pollutant concentration level (1/1-1/4), flow rate (10-40 mL/min), NaCl concentration (0.1-1 M), pH (3-9) and current density (4.73-23.67 mA/cm(2)) parameters on the removals of total suspended solids, total organic carbon, chemical oxygen demand, total nitrogen and color for economic treatment of cattle-abattoir wastewater using mesh-type Ti/Pt anodes with continuous EO system. Total suspended solids, total organic carbon, chemical oxygen demand, total nitrogen and color analyses were carried out according to photometric method, catalytic oxidation method, closed reflux colorimetric method, nitrogen cell test method and platinum-cobalt method, respectively. The effluent chloride levels were analyzed according to the argentometric titration method. According to results, all operational parameters had an impact on removal efficiencies but the most effective parameters on energy consumption were NaCl concentration and applied current density. Although two possible system conditions were determined according to removal efficiencies the operating conditions with the lowest energy consumption are considered to be optimal. The optimum operating conditions were determined as NaCl concentration of 1 M, CD of 4.73 mA/cm(2), initial pH of 7.03, reaction temperature of 25 degrees C and FR of 10 mL/min. Under these conditions removal efficiencies (%) for total suspended solids, total organic carbon, chemical oxygen demand, total nitrogen and color were found as; 98.28, 93.03, 97.44, 95.53 and 99.80, respectively. The energy consumption values were calculated as 2.42 kWh/kg COD and 19.43 kWh/m(3). The approximate cost to treat 1 m(3) wastewater was calculated as $ 6.43. The kinetic behavior abided by a pseudo-first-order model.
Electrochemical Mineralization of Abattoir Wastewater With Continuous System (Vol 18, Pg 3761, 2021)
(Springer, 2022) Ozturk, D.; Yilmaz, A. E.; Sapci Ayas, Z.
Investigation of Electrochemical Degradation of Basic Red 13 Dye in Aqueous Solutions Based on Cod Removal: Numerical Optimization Approach
(Springer, 2020) Ozturk, D.; Yilmaz, A. E.
The aim of this study was to remove Basic Red 13 dye by electrochemical oxidation with Ti/Pt anodes and to numerically optimize the operating conditions such as current density (5-20 mA/cm(2)), flow rate (10-50 mL/min), initial pH (2-9) and supporting electrolyte concentration (10-100 mM) by using response surface methodology. Chemical oxygen demand analysis which was chosen as a response was performed according to closed reflux colorimetric method. Also, the effluent chloride levels were analyzed with the argentometric method. Momentary temperature, pH and electrical conductivity readings were taken with a multimeter. Although a number of possible system conditions were obtained with numerical optimization, the system operating conditions with the lowest energy consumption are considered to be optimal. From the quadratic model formed from central composite design in response surface methodology with numerical analysis, the optimum conditions were determined to be 4.38 for initial pH, 19.53 mA/cm(2) for current density, 40.78 mL/min for flow rate and 85.57 mM for supporting electrolyte concentration. At these optimum points, chemical oxygen demand removal efficiency was calculated as 99.98% and energy consumption values of the system were calculated as 7.91 kW h/m(3) and 0.98 kW h/kgCOD. Under these conditions when an industrial system is operated, the chemical oxygen demand removal yield will be 99.98% and the approximate cost of the system will be $1.25 to treat 1 ton of wastewater.