Applying UV absorbance and fluorescence indices to estimate inactivation of bacteria and formation of bromate during ozonation of water and wastewater effluent

Water Research
Ji WuWen-Tao Li

Abstract

Ozone is an effective oxidant and disinfectant commonly used for elimination of micropollutants and inactivation of resistant microbes. However, undesirable oxidation/disinfection byproducts such as bromate might form during ozonation. In this study, the UV absorbance and fluorescence indices were applied as surrogate indicators for predicting the inactivation of bacteria and formation of bromate during ozonation of water and wastewater effluents. The inactivation efficiencies of lab-cultured Escherichia coli (E. coli) and autochthonous bacteria were measured by plating (for E. coli only) and flow cytometry with fluorescence staining. During ozonation of E. coli spiked into wastewater effluents (∼106 cell/mL), the priority of inactivation efficiency determined by different cell viability methods were in the order of CFU > membrane damage > DNA damage. Approximately, 99% membrane damage and/or 90% DNA damage are conservatively supposed as an indicator for sufficient bacterial inactivation as well as degradation of antibiotic resistance genes. The related required O3 dosing thresholds for sufficient inactivation of E. coli and autochthonous bacteria refer to ∼0.6 O3/DOC (g/g), ∼50% decrease of UVA254, ∼60% decrease of UVA280, or ...Continue Reading

Citations

Nov 13, 2018·Nanotechnology·Lingyan MengMengtao Sun
Aug 15, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Vijay Sundaram, Krishna Pagilla
Sep 6, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Lihua LanDezhao Liu

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