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1 Polish Journal of Environmental Studies

1 2013

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Disinfection of UASB-treated municipal wastewater by H2O2, UV, ozone, PAA, H2O2/sunlight, and advanced oxidation processes: regrowth potential of pathogens

100%

Rizvi H. , Ahmad N. , Yasar A. , Bukhari K. , Khan H.

Polish Journal of Environmental Studies

2013

tom 22

nr 4

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.