http://hdl.handle.net/10366/3916 2026-04-23T17:59:56Z 2026-04-23T17:59:56Z García Prieto, Juan Carlos Núñez-Núñez, Cynthia Manuela Proal-Nájera, José Bernardo García Roig, Manuel http://hdl.handle.net/10366/150939 2025-04-30T19:22:18Z 2022-01-20T00:00:00Z

[EN] The inactivation processes of coliform bacteria (total and fecal) and sulphito-reducing Clostridium bacteria (vegetative species and spores) in water maturation lagoon of a low-cost nature-based wastewater treatment plant using constructed wetlands and through processes of photolysis in a pilot photoreactor have been comparatively studied. The diferent inactivation mechanisms by photolysis of these bacteria have been studied following the criteria of diferent statistical and kinetic models. Clostridium disinfection treatments ft models in which two types of bacteria populations coexist, one sensitive (vegetative species) and the other (spores) resistant to the treatment, the sensitive one (94%) with an inactivation rate of k=0.24±0.07 min−1 and the resistant one (6%) with k=0.11±0.05 min−1. Total coliform photolytic disinfection also shows two populations with diferent physiological state. The time required to reduce the frst logarithmic decimal cycle of the diferent types of bacteria (physiological states) are δ1=4.2±0.9 and δ2=8.3±1.1 min, respectively. For fecal coliform photolytic disinfection, only bacteria population, with k=1.15±0.19 min−1, is found. The results obtained confrm the photolytic disinfection processes and maturation lagoon are efective systems for Clostridia bacteria removal after water treatment by nature-based systems. Total removal of coliform bacteria is not achieved by maturation lagoons, but their reduction is signifcant using low doses of cumulative radiation.

2022-01-20T00:00:00Z