title: Disinfection of an advanced primary effluent using peracetic acid or ultraviolet radiation for its reuse in public services.
abstract: The disinfection of a continuous flow of an effluent from an advanced primary treatment (coagulation-flocculation-sedimentation) with or without posterior filtration, using either peracetic acid (PAA) or ultraviolet (UV) radiation was studied. We aimed to obtain bacteriological quality to comply with the microbiological standard established in the Mexican regulations for treated wastewater reuse (NOM-003-SEMARNAT-1997), i.e., less than 240 MPN (most probable number) FC/100 mL. The concentrations of PAA were 10, 15, and 20 mg/L, with contact times of 10, and 15 min. Fecal coliforms (FC) inactivation ranged from 0.93 up to 6.4 log units, and in all cases it reached the limits set by the mentioned regulation. Water quality influenced the PAA disinfection effectiveness. An efficiency of 91% was achieved for the unfiltered effluent, as compared to 99% when wastewater was filtered. UV radiation was applied to wastewater flows of 21, 30 and 39 L/min, with dosages from 1 to 6 mJ/cm². This treatment did not achieve the bacteriological quality required for treated wastewater reuse, since the best inactivation of FC was 1.62 log units, for a flow of 21 L/min of filtered wastewater and a UV dosage of 5.6 mJ/cm².
authors.affiliation: Metropolitan Autonomous University- Azcapotzalco, 180 San Pablo Ave, Mexico, D.F. 02200.
authors.forename: Flores R
authors.initials: FR
authors.lastname: Julio
authors.affiliation: Metropolitan Autonomous University- Azcapotzalco, 180 San Pablo Ave, Mexico, D.F. 02200.
authors.forename: Terres-Peña
authors.initials: TP
authors.lastname: Hilario
authors.affiliation: Metropolitan Autonomous University- Azcapotzalco, 180 San Pablo Ave, Mexico, D.F. 02200.
authors.forename: Vaca M
authors.initials: VM
authors.lastname: Mabel
authors.affiliation: Metropolitan Autonomous University- Azcapotzalco, 180 San Pablo Ave, Mexico, D.F. 02200.
authors.forename: López C
authors.initials: LC
authors.lastname: Raymundo
authors.affiliation: Metropolitan Autonomous University- Azcapotzalco, 180 San Pablo Ave, Mexico, D.F. 02200.
authors.forename: Lizardi-Ramos
authors.initials: LR
authors.lastname: Arturo
authors.affiliation: National Autonomous University of Mexico, Institute of Engineering, A. Postal 70-472, Coyoacán Zip 04510, Mexico, D.F. E-mail: nrov@pumas.iingen.unam.mx.
authors.forename: Rojas-Valencia
authors.initials: RV
authors.lastname: Ma Neftalí
mesh_terms: D058491:Bacterial Load; D004202:Disinfectants / Q000494:pharmacology*; D004203:Disinfection; D004755:Enterobacteriaceae / Q000187:drug effects* / Q000302:isolation & purification / Q000528:radiation effects*; D010463:Peracetic Acid / Q000494:pharmacology*; D059027:Recycling; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater; D014873:Water Pollutants / Q000737:chemistry / Q000528:radiation effects
chemical_list: D004202:Disinfectants; D010463:Peracetic Acid; D062065:Wastewater; D014873:Water Pollutants