ORIGINAL RESEARCH
Ozone for Color and COD Removal of Raw and Anaerobically Biotreated Combined Industrial Wastewater
A. Yasar, N. Ahmad, M. N. Chaudhry, M. S. U. Rehman, A. A. A. Khan
 
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Directorate of Research and Development, University of the Punjab, Lahore-Pakistan
 
Pol. J. Environ. Stud. 2007;16(2):289–294
 
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ABSTRACT
Ozonation was carried out for decolorization and COD removal of raw and anaerobically treated UASB (upflow anaerobic sludge blanket) combined industrial (mainly textile) effluent in a lab-scale bubble column reactor. Ozonation of anaerobic bioprocess effluent at a dose of 300 mg/h for 10 min resulted in 81% color and 75% COD removal (100 mgO3/80 mg COD) while for raw wastewater 25 min ozonation furnished 51% color and 67% COD removal (250 mgO3/345 mg COD). Optimal process conditions for biotreated effluent (pH = 8 and temperature = 25°C) resulted in 100% color and 96% COD removal for 10 min ozonation (100 mgO3/104 mg COD). Electrical energy comparison demonstrated that post ozonation required less electrical energy, 16 and 2.9 times as compared to pre ozonation.
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ISSN:1230-1485