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Bacterial inactivation in wastewater using UV/H2O2 advanced oxidation

Authors : Moumita Bairagi a, Asok Adak *a and Md. Mirajul Islam b


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Abstract

The antibiotic resistant bacteria have been spread from the environment to human through the water and the inactivation processes may be a possible way to reduce this type of threat. The main objective of this work is to investigate inactivation of E. coli present in wastewater employing direct UV andadvanced UV/H2O2 process. Bacterial inactivation both in real wastewater as well as synthetic wastewater was also investigated. Direct photolysis at 253.7 nm showed only 61% inactivation when initial bacterial concentration was 1.7×107 CFU/mL. In case of UV/H2O2, about 99% bacterial inactivation was observed at 240 min treatment. It is concluded that during the advanced oxidation process, the chemical compound hydrogen peroxide (H2O2) absorbs UV light andhydroxyl radicals are produced by photolysis. These hydroxyl radicals are strong oxidizing agents and help to inactivate the bacteria.

Keyword

Antibiotic resistance, E. coli, UV, H2O2, Wastewater