The combined performance of UV light and chlorine during reclaimed water disinfection

Water Science and Technology : a Journal of the International Association on Water Pollution Research
M MontemayorL Sala

Abstract

The combined effects of disinfectant agents on the microbiological quality of reclaimed water produced by two full-scale water reclamation plants in Catalonia, Spain, were examined in this work. All the disinfectant treatments tested led to the absence, or near absence, of E. coli in 100 mL samples of water, with log reductions of more than 3 log u. Hypochlorite reduced the bacterial concentrations. However, ultraviolet light was more effective than hypochlorite at reducing the concentrations of bacteriophages, viruses and pathogenic protozoa such as Cryptosporidium spp. We conclude that a combination of these two disinfectant agents is effective in protecting public health, as each agent acts to a different degree against the different groups of microorganisms studied. Further studies should investigate the combined action of disinfectant agents at water reclamation plants with ultraviolet light equipment in more favourable working conditions in order to assess their capacity to inactivate microorganisms.

Citations

Jul 2, 2011·Environmental Science and Pollution Research International·María-Eugenia RubianoFrancisco Lucena
Nov 5, 2015·Journal of Hazardous Materials·Jinshan ZhangYun Lu
Feb 4, 2016·Journal of Water and Health·Abidelfatah M Nasser
Nov 25, 2018·The Science of the Total Environment·Daniel Toribio-AvedilloMaite Muniesa
Feb 18, 2021·Journal of Applied Microbiology·A KrishnanF Critzer
May 25, 2021·Journal of Environmental Management·A Rosińska
Jul 3, 2021·Viruses·Daniel Toribio-AvedilloLorena Rodríguez-Rubio

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