Kinetic Models of Disinfection with Sodium Hypochlorite and Peracetic Acid of Bacteria Isolated from the Effluent of a WWTP

The disinfection of wastewater is a treatment that allows for its reuse. However, not all pathogenic microorganisms or their resistant structures, e.g., endospores, cysts, oocysts, are eliminated in conventional treatments. This work compared the removal efficacy sodium hypochlorite (NaClO) and peracetic acid (PAA) on three strains bacteria isolated from tertiary effluent plant. results inactivation kinetics showed complete S. pasteuri was achieved with both NaClO (>12 log, t = 5–10 min, 15–30 mg/L) PAA (~9 20–30 15 mg/L). Likewise, higher concentration disinfectants, time decreased. K. pneumoniae greater resistance to (3 30 min) than (8 min). B. subtilis endospores 60–100 mg/L); however, more effective (~4 45–100 min), mg/L regarding these latter four kinetics. curves concave linear tendencies tail effects, fitting Weibull Geeraerd models. Both models established vegetative cells this study conclusive understand differences between biological forms and, consequently, ability survive disinfection.