Pathogen Re-Growth in UASB Effluent Disinfected By UV,O3, H2O2, and Advanced Oxidation Processes |
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Authors: | Abdullah Yasar Nasir Ahmad Hummaira Latif Aamir Amanat Ali Khan |
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Affiliation: | Directorate of Research and Development , University of the Punjab , Lahore-Pakistan |
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Abstract: | Disinfection of anaerobically treated effluent (UASB) was carried out to eliminate the enteric pathogens by using UV irradiation, peracetic acid, H2O2, O3 and advanced oxidation processes (O3/H2O2, O3/UV and H2O2/UV). Re-growth potential of these pathogens was monitored in terms of time and temperature. Inactivation of pathogens by ozone at the rate of 300 mg/h for 20 minutes approached 99%. UV irradiation resulted in 99% pathogen removal at irradiation time of 120 seconds. A dose of 170 mg/L H2O2 eliminated more than 99% pathogens. Samples disinfected with UV, H2O2 and O3 showed gradual re-growth with an increase in time and temperature (from 20 to 35°C). However, disinfection with AOPs proved to be the most effective tool resulting in reduction of treatment time taken by individual processes, also the disinfected samples showed minimal re-growth revealing the superiority of their combined effects. |
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Keywords: | Ozone Anaerobically Treated Effluent (UASB) Pathogens Disinfection Advanced Oxidation Processes Re-Growth |
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