Pre-ozonation of aqueous azo dye (Acid Red-151) followed by activated sludge process

Gokcen F., Ozbelge T. A.

CHEMICAL ENGINEERING JOURNAL, vol.123, no.3, pp.109-115, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 123 Issue: 3
  • Publication Date: 2006
  • Doi Number: 10.1016/j.cej.2006.07.005
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.109-115
  • Keywords: activated sludge process, pre-ozonation, Acid Red-151, AR 151 ozonation, enhancement of biodegradability, integrated process of chemical and biological oxidations, TEXTILE WASTE-WATER, BIODEGRADATION, DEGRADATION, OXIDATION, OZONE, DETOXIFICATION, ENHANCEMENT, WASTEWATERS, ADSORPTION, KINETICS
  • Middle East Technical University Affiliated: No


In this study, the efficiency of the integrated process was investigated in which the pre-ozonation step was followed by activated sludge process (ASP) in treating the aqueous Acid Red-151 (AR 151) solutions. The percent dye removal in the integrated process was found to be 47% for a pre-ozonation time of 30 min, instead of 25% in the singly ASP without pre-ozonation. The treatment efficiency of this process could be higher if the pre-ozonation time of 120 min yielding maximum enhancement of biodegradability at a peak value of BOD5/COD ratio were used before the biological treatment process. (c) 2006 Elsevier B.V. All rights reserved.