Browsing by Author "Degermenci, N."

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Investigation of Mass Transfer of Ozone in Jet Loop Reactor
(2024.01.01) Cengiz, I.; Degermenci, N.; Yildiz, E.; Barlak, M.S.
Mass transfer of ozone in a jet loop reactor was investigated in this study. Different parameters such as ozone gas concentration, gas flow rate, circulation flow rate, and spray nozzle diameter were examined for their effect on mass transfer. In experiments with ozone gas concentrations ranging from 3.83 to 17.1 g/m3, the KLa values remained unchanged, with an average of 28.7 +/- 2.2 h-1. As the ozone gas concentration increased, the saturation values of ozone in the liquid phase also increased. Experiments were carried out with gas flow rates ranging from 50 to 250 L/h in the jet loop reactor, and increasing gas flow rates increased the KLa value up to five times. When the effect of the liquid circulation flow rate was examined for a spray nozzle diameter of 15.5 mm, increasing the flow rate from 40 L/min to 80 L/min increased the KLa value by approximately 41%. However, the power consumed per reactor volume for this process increased 8 times and reached 2.65 kW/m3. KLa values in the JLR vary between 6.1 and 37.3 h-1 depending on operating parameters and it has been concluded that it performs well compared to its counterparts.
Removal of Phosphate from Aqueous Solution Using Anion Exchange Resin: Equilibrium Isotherms and Kinetics
(2023.01.01) Korkmaz, C.; Degermenci, G.D.; Degermenci, N.
Phosphate removal before discharging wastewater into the receiving environment is important since eutrophication has become an environmental problem on a global scale. In this study, phosphate ion removal from aqueous solutions was investigated using a strong anion exchange resin, Purolite A200E. The effects of initial phosphate ion concentration, initial pH value of the solution, resin dosage, stirring speed, presence of some anions in solution, and temperature on the ion exchange process were researched. Resin dosage, stirring speed, and temperature increases were determined to increase the phosphate removal rate. The highest phosphate removal efficiency was observed in the pH interval 7-9. With initial phosphate concentration of 10 and 20 mg/L, 1.50 g/500 mL resin dosage fully removed phosphate at the end of 120 min. However, at phosphate concentrations higher than 20 mg/L, increasing phosphate concentrations caused a reduction in removal efficiency. The competitive anion with the most effect on phosphate removal was sulfate while adding bicarbonate did not affect phosphate removal. Pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetic models were used to assess experimental data. Kinetic studies revealed that the ion exchange process can be explained better by the PFO kinetic model. Equilibrium isotherm data were analyzed with the Freundlich and Langmuir equations, and the Freundlich isotherm model fitted the equilibrium data better.