Application of Box-Wilson experimental design method for the photodegradation of bakery's yeast industry with UV/H2O2 and UV/H2O2/Fe(II) process

• Published in: Journal of hazardous materials Vol. 128; no. 2-3; pp. 201 - 207
• Main Authors: CATALKAYA, Ebru C, SENGÜL, Fusun
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 06.02.2006
• Subjects: Applied sciences; Chemical engineering; Exact sciences and technology; Ferric Compounds - chemistry; Hydrogen Peroxide - chemistry; Hydrogen-Ion Concentration; Industrial Waste - prevention & control; Models, Chemical; Osmolar Concentration; Photochemistry - methods; Pollution; Reactors; Saccharomyces cerevisiae - chemistry; Saccharomyces cerevisiae - radiation effects; Ultraviolet Rays; Water Pollutants; Water Pollution - prevention & control; Discoloration; Hydrogen peroxide; Oxidant; Design; Decolorization; Mineralization; pH; Fenton reaction; Oxidation; Reactor; Bakery's yeast industry; Photochemical degradation; Pollutant behavior; Iron II; Prediction; Bakery; Laboratory scale; Regression analysis; Heavy metal; UV/H2O2 process; Response function; Ultraviolet radiation; Experimental design; Box-Wilson design; Physicochemical purification; Photo-Fenton process; Mercury; Photooxidation
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2005.07.052

Decolorization and mineralization of bakery's yeast industry effluent by photochemical advanced oxidation processes (AOPs) utilizing UV with hydrogen peroxide and Photo-Fenton, were investigated in a laboratory scale photo-reactor equipped with a 16 W low-pressure mercury vapor lamp. The Box-Wilson experimental design method was employed to evaluate the effects of major process variables (e.g. pH, oxidant dose, and irradiation time) on the decolorization efficiency. Response function coefficients were determined by regression analysis of the experimental data and prediction results agreed with the experimental results. The optimum hydrogen peroxide concentration and irradiation time were found to be 5 mM and 50 min at pH 3, respectively, for UV/H2O2 process. In the Photo-Fenton process application, maximum decolorization efficiency (96.4%) was obtained at the optimum reaction conditions that were 100 mM H2O2 and 1 mM Fe(II) doses at pH 3, and 10 min of irradiation time.