Disinfection tests were carried out at pilot scale to compare the disinfection efficiency of ozone, sodium hypochlorite (NaOCI), peracetic acid (PAA), and UV irradiation. Total coliforms, fecal coliforms, and Escherichia coli were monitored as reference microorganisms. Total heterotrophic bacteria (THB) were also enumerated by cytometry. At similar doses, NaOCI was more effective than PAA, and its action was less affected by contact time. The results obtained by ozonation were comparable for total coliforms, fecal coliforms, and E. coli. On the contrary, some differences among the three indicators were observed for NaOCI, PAA, and UV. Differences increased with increasing values of the disinfectant concentration times contact time (C·t) and were probably the result of different initial counts, as total coliforms include fecal coliforms, which include E. coli. The UV irradiation lead to complete E. coli removals, even at low doses (10 to 20 mJ/cm2). Total heterotrophic bacteria appeared to be too wide a group to be a good disinfection indicator; no correlation was found among THB inactivation, dose, and contact time.

Mezzanotte, V., Antonelli, M., Citterio, S., & Nurizzo, C. (2007). Wastewater disinfection alternatives: Chlorine, ozone, peracetic acid, and UV light. WATER ENVIRONMENT RESEARCH, 79(12), 2373-2379 [10.2175/106143007X183763].

Wastewater disinfection alternatives: Chlorine, ozone, peracetic acid, and UV light

MEZZANOTTE, VALERIA FEDERICA MARIA;CITTERIO, SANDRA;
2007

Abstract

Disinfection tests were carried out at pilot scale to compare the disinfection efficiency of ozone, sodium hypochlorite (NaOCI), peracetic acid (PAA), and UV irradiation. Total coliforms, fecal coliforms, and Escherichia coli were monitored as reference microorganisms. Total heterotrophic bacteria (THB) were also enumerated by cytometry. At similar doses, NaOCI was more effective than PAA, and its action was less affected by contact time. The results obtained by ozonation were comparable for total coliforms, fecal coliforms, and E. coli. On the contrary, some differences among the three indicators were observed for NaOCI, PAA, and UV. Differences increased with increasing values of the disinfectant concentration times contact time (C·t) and were probably the result of different initial counts, as total coliforms include fecal coliforms, which include E. coli. The UV irradiation lead to complete E. coli removals, even at low doses (10 to 20 mJ/cm2). Total heterotrophic bacteria appeared to be too wide a group to be a good disinfection indicator; no correlation was found among THB inactivation, dose, and contact time.
Articolo in rivista - Articolo scientifico
Bacteria ; Enterobacteriaceae ; Microbiology ; Biological contamination ; Pathogenic ; Drinking water treatment ; Metabolic inactivation ; Correlation analysis ; Correlation ; Indicator ; Ozonization ; Surveillance ; Escherichia coli ; Coliforms ; Ultraviolet radiation ; Ozone ; Chlorine ; Disinfection ; Waste water ;
English
Mezzanotte, V., Antonelli, M., Citterio, S., & Nurizzo, C. (2007). Wastewater disinfection alternatives: Chlorine, ozone, peracetic acid, and UV light. WATER ENVIRONMENT RESEARCH, 79(12), 2373-2379 [10.2175/106143007X183763].
Mezzanotte, V; Antonelli, M; Citterio, S; Nurizzo, C
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/6068
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