Browsing by Author "Öztürk, D."

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Design and Optimization of Cu(Ii) Adsorption Conditions From Aqueous Solutions by Low-Cost Adsorbent Pumice With Response Surface Methodology
(HARD Publishing Company, 2015) Öztürk, D.; Şahan, T.
The adsorption of Cu(II) by pumice was investigated in a batch system. Optimization of medium conditions was studied through experimental design. Response surface methodology – including central composite design – was successfully applied to develop a response surface to optimize medium conditions. The most influential medium parameters were determined as initial Cu(II) concentration, pH, temperature, and adsor-bent dosage. The optimum conditions were evaluated to be 47.14 mg/L, 5.31, 38.30ºC, and 3.14 g for initial Cu(II) concentration, pH, temperature and adsorbent dosage, respectively. At these optimum points, the adsorption yield and adsorption capacity were calculated as 95.10% and 1.43 mg/g, respectively. © 2015, HARD Publishing Company. All rights reserved.
An Investigation Based on Removal of Ibuprofen and Its Transformation Products by a Batch Activated Sludge Process: a Kinetic Study
(Yildiz Technical University, 2021) Özgüven, A.; Öztürk, D.; Bayram, T.
Ibuprofen metabolites can form in humans as a result of metabolic activities or can be produced by microorganisms in wastewater treatment plants and receiving environments, which increases their likelihood of being present in the environment. In this study, various experiments were conducted to determine the removal degree for ibuprofen, ibuprofen carboxylic acid (IBU-CBX), and 2-hydroxylated ibuprofen (IBU-2-OH) metabolites with an activated sludge reactor. Furthermore, the pseudo-first-order biodegradation rate constant (kbiol) (17.76 L/gSSday) was calculated to determine the decomposition degree of ibuprofen in the batch activated sludge system. The effects of different ibuprofen concentrations (8.2, 5.6, 3.2, 1.51 mg/L) at constant biomass concentration (3 g/L) on the biodegradation mechanism were investigated. In addition, IBU-2-OH and IBU-CBX were tested in a batch activated sludge reactor with a volume of 2 L individually at 100 μg/L with activated sludge containing 3 g/L biomass. It was observed that ibuprofen had a removal efficiency of more than 90%. IBU-CBX and IBU-2-OH were removed at approximately 27–91% and 18–82%, respectively. In abiotic conditions, the removal of ibuprofen was found to be 7.07%. It was confirmed that the removal of ibuprofen largely depended on biological degradation. This study enabled us to know which metabolites are involved in the biodegradation process of ibuprofen in batch experiments with the activated sludge process. Copyright 2021, Yıldız Technical University.