An EPR study on wastewater disinfection by peracetic acid, hydrogen peroxide and UV irradiation.
EPR spectroscopy was applied to obtain qualitative and quantitative information on the radicals produced in disinfection processes of wastewater for agricultural reuse. The DEPMPO spin trap was employed to detect hydroxyl and carbon-centered short living radicals in two different peracetic acid solutions and a hydrogen peroxide solution used for water disinfection either in the absence or in the presence of UV-C irradiation. Moreover, three different kinds of water (wastewater, demineralized water, distilled water) were analysed in order to assess the contribution of Fenton reactions to the radical production. The spectroscopic results were discussed in relation to the efficiency of the different oxidizing agents and UV irradiation in wastewater disinfection evaluated as Escherichia Coli, Faecal and Total Coliforms inactivation.
Bianchini
Roberto
R
Dipartimento di Chimica Organica, Università di Firenze, Polo Scientifico, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze.
Calucci
Lucia
L
Caretti
Cecilia
C
Lubello
Claudio
C
Pinzino
Calogero
C
Piscicelli
Michela
M
D004203:Disinfection / Q000379:methods*; D004578:Electron Spin Resonance Spectroscopy; D004755:Enterobacteriaceae / Q000378:metabolism; D004926:Escherichia coli / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000737:chemistry* / Q000378:metabolism; D017665:Hydroxyl Radical / Q000378:metabolism; D007558:Italy; D010463:Peracetic Acid / Q000737:chemistry* / Q000378:metabolism; D013113:Spin Labels; D019097:Spin Trapping; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014871:Water Microbiology; D018508:Water Purification / Q000379:methods*
D013113:Spin Labels; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D010463:Peracetic Acid