Color and COD Reduction of Biotreated Complex Wastewater using Ozonation Process

Authors

  • Muhammad Saif Ur Rehman Department of Environmental Science, Institue of Chemical & Biological Sciences, University of Gujrat
  • Sajid Mehmood Institue of Chemical & Biological Sciences
  • Ayyaz Ahmad Department of Chemical Engineering
  • Ameena Saeed Department of Environmental Science
  • Tariq Mahmood Department of Environmental Science

Keywords:

Biotreated wastewater, Ozone, Color, COD

Abstract

This study was mainly focused to investigate the color and COD abatement kinetics of ozonation process for biotreated complex wastewater. An up-flow anaerobic filter reactor (UAFR) treated combined domestic and industrial wastewater was ozonated to improve the effluent quality. The efficacy of ozonation process was assessed in terms of color and COD removal. Ozonation process followed pseudo first order kinetics. It was found that decoloration rate constant (kd) and COD abatement rate constant (kcod) had observed two stages; the first stage with a greater efficiency and second with decreasing trend. However, both the color and COD rate constants had great dependence on ozonation time, pH and temperature. Ozone feed time showed a critical impact on reaction rate whereas values of both rate constants respectively grew almost doubled at pH 9 (0.39 min-1 and 0.15 min-1) than their values at pH 7 (0.21 min-1 and 0.07 min-1) as reaction was controlled by hydroxyl radicals. However elevated temperature showed insignificant impact on ozone performance. An ozonation time of 10 minutes, pH value of 7.6 and room temperature were found as optimal process variables on the basis of EE/O (Electrical energy required per order of pollutant) values. 

Author Biographies

  • Muhammad Saif Ur Rehman, Department of Environmental Science, Institue of Chemical & Biological Sciences, University of Gujrat
    Lecturer, Department of Environmental Science, Institue of Chemical & Biological Sciences, University of Gujrat, Haifz Hayat Campus, Gujrat
  • Sajid Mehmood, Institue of Chemical & Biological Sciences
    Asst. Prof, Institue of Chemical & Biological Sciences, University of Gujrat, Haifz Hayat Campus, Gujrat
  • Ayyaz Ahmad, Department of Chemical Engineering
    Department of Chemical Enginnernig, University of Gujrat, Haifz Hayat Campus, Gujrat
  • Ameena Saeed, Department of Environmental Science
    Department of Environmental Sciences, PMAS Arid Agriculture University, Murree Road, Rawalpindi
  • Tariq Mahmood, Department of Environmental Science
    Chairman, Department of Environmental Sciences, PMAS Arid Agriculture University, Murree Road, Rawalpindi

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Published

2011-11-01

Issue

Vol. 39 No. 1 (2011): Journal of the Pakistan Institute of Chemical Engineers

Section

Articles

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How to Cite

Color and COD Reduction of Biotreated Complex Wastewater using Ozonation Process. (2011). Journal of the Pakistan Institute of Chemical Engineers, 39(1), 81-87. https://www.piche.org.pk/journal/index.php/jpiche/article/view/27