ORIGINAL RESEARCH
Disinfection of UASB-Treated Municipal Wastewater by H2O2, UV, Ozone, PAA, H2O2/Sunlight, and Advanced Oxidation Processes: Regrowth Potential of Pathogens
Hina Rizvi1, Nasir Ahmad2, Abdullah Yasar3, Kiran Bukhari2, Hajira Khan2
 
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1Environmental Sciences Department, Government College University, Faisalabad, Pakistan
2Institute of Geology, University of the Punjab, Lahore, Pakistan
3Sustainable Development Study Center, Government College University, Lahore, Pakistan
 
Pol. J. Environ. Stud. 2013;22(4):1153–1161
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ABSTRACT
Disinfection of anaerobically treated municipal wastewater was done using ozone, UV, H2O2, peracetic acid, and advanced oxidation processes (O3/H2O2, O3/UV, H2O2/UV, H2O2/sunlight). Ozone, UV irradiation, and H2O2 eliminated 99% of pathogens (total coliform, fecal coliform, and E. coli) at ozonation time of 20 min at the rate of 1000 mg/hr; UV irradiation time of 11 min and H2O2 dose of 336 mg/L. The use of combined systems (H2O2/sunlight) is especially promising due to the synergistic effect and cost efffectiveness. Regrowth of pathogens increased with increase in time and temperature (from 15 to 35ºC). The presence of nutrients and fluorescent light enhanced the rate of reactivation of pathogens.
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