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

How to Cite

Saif Ur Rehman, M., Mehmood, S., Ahmad, A., Saeed, A., & Mahmood, T. (2011). Color and COD Reduction of Biotreated Complex Wastewater using Ozonation Process. Journal of the Pakistan Institute of Chemical Engineers, 39(1), 81–87. Retrieved from http://piche.org.pk/journal/index.php/jpiche/article/view/27

Issue

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

Section

Articles

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