Browsing by Author "Tanyolac, Abdurrahman"

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Optimization of Electrochemical Treatment of Industrial Paint Wastewater With Response Surface Methodology
(Elsevier Science Bv, 2007) Koerbahti, Bahadir K.; Aktas, Nahit; Tanyolac, Abdurrahman
The electrochemical oxidation of water-based paint wastewater was investigated batch-wise in the presence of NaCl electrolyte with carbon electrodes for the first time in literature. The electrochemical treatment conditions were optimized using response surface methodology where potential difference, reaction temperature and electrolyte concentration were to be minimized while chemical oxygen demand (COD), color and turbidity removal percents and initial COD removal rate were maximized at 100% pollution load. The optimum conditions were satisfied at 35 g/L external electrolyte concentration, 30 degrees C reaction temperature and 8 V potential difference (64.37 mA/cm(2) current density) realizing 51.8% COD and complete color and turbidity removals, and 3010.74 mg/L h initial COD removal rate. According to these results, the electrochemical method could be a strong alterative to conventional physicochemical methods for the treatment of water-based paint wastewater. (c) 2007 Elsevier B.V. All rights reserved.
Optimization of Lactose Utilization in Deproteinated Whey by Kluyveromyces Marxianus Using Response Surface Methodology (Rsm)
(Elsevier Sci Ltd, 2006) Aktas, Nahit; Boyaci, I. Hakki; Mutlu, Mehmet; Tanyolac, Abdurrahman
Kluyveromyces marxianus Y-8281 yeast culture was utilized for the biological treatment of deproteinated whey wastewater in a batch system. Removal of lactose was optimized by the utilization of response surface methodology, RSM. The empirical model developed through RSM in terms of effective operational factors of medium pH, temperature, lactose and ammonia concentrations was found adequate to describe the treatment of deproteinated whey. Through the analysis, medium pH and temperature were found to be the most significant factors and an increment in both had a positive effect on lactose utilization, while lactose and ammonia concentrations had the least weight within the ranges investigated. Based on contour plots and variance analysis, optimum operational conditions for maximizing lactose removal were found to be 31 degrees C, 45 g/L whey powder concentration, 4 g/L total ammonium salt concentration and medium pH 6. Under the optimum operating conditions determined, 95% lactose removal was achieved after an 18-h fermentation. (c) 2005 Elsevier Ltd. All rights reserved.