Dyes are constant compounds that are not easily biodegradable and are considered as cancerous agents. Electro-coagulation and electro-floatation method due to adaptability and compatibility with environment is regarded as one of the appropriate method for the treatment of wastewater industries containing dye. In this study in which stainless steel mesh electrodes with horizontal arrangement are used, the most important parameters affecting on the performance of simultaneous system of electro-coagulation and electro-floatation including electrodes area, the distance between electrodes, solution’s electrical conductivity, type of electrolyte, and initial pH were examined and the effect of every one of these parameters in color removal efficiency of Acid Red 14 from artificial wastewater, energy consumption and anode was determined and their values were optimized. The area of electrode equals 20.5 cm², the distance between the electrodes 0.5 cm, electrical conductivity 3600uu S/cm, and initial pH 7 were selected as the optimum values, and dye removal efficiency of 99 % with initial concentration of 150 mg/L and electric current density 40 mA/cm² (0.8 A) were obtained under optimum condition and within 20 minutes. The advantages of this method are low energy and material consumption beside the low produced sludge.

Hossein Ganjidoust received his BS in Chemical Engineering from Kansas State University, Manhattan, Kansas in 1976, 1st MS in Industrial Management from Central Missouri State University, Warrensburg, Missouri in 1977 and 2nd MS in Sanitary Engineering from the University of Missouri-Columbia in 1978 and PhD in Environmental Engineering from the University of Missouri-Rolla in 1988. From March 1995 to April 1996, he was on a Year of Sabbatical Leave At The National Institute for Resources & Environment (NIRE), Tsukuba Science City, Tsukuba, and Ibaraki, Japan. He has over 30 years experience in teaching and research in graduate levels and is presently engaged as Full Professor in the Department of Environmental Engineering, Civil & Environmental Engineering Faculty, at Tarbiat Modares University in Tehran, I.R. Iran. Dr. Ganjidoust’s research interests include water & wastewater, industrial and hazardous waste handling, treatment and disposal. He has supervised more than 20 research projects, and many PhD and MS students’ thesis. At present time, he has supervisor of 6 PhD theses and 8 MS thesis. He has published over 120 papers in scientific national and ISI Journals and over 150 conference proceedings on his research. He is co-author of the book entitled: "Application of Moving Bed Biofilm Reactor (MBBR) in Sanitary & Industrial Wastewater Treatment", Tarbiat Modares Univ. Published in February 2011 and a chapter on: “Hazardous Waste Management in Islamic Republic of Iran, HWM Policies and Practices in Asian Countries” published by Asian Productivity Organization (APO), Tokyo in October 2001.