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Título
Study of coliforms and Clostridium bacteria inactivation in wastewaters by a pilot photolysis process and by the maturation lagoons of a low-cost nature-based WWTP
Autor(es)
Materia
Photolysis
Wastewater
Disinfection/inactivation
Endospores
Clostridium
Coliforms
Maturation lagoons
Constructed wetlands
Clasificación UNESCO
3308.11 Control de la Contaminación del Agua
Fecha de publicación
2022-01-20
Editor
Springer
Citación
García-Prieto, J.C., Núñez-Núñez, C.M., Proal-Nájera, J.B. et al. (2022). Study of coliforms and Clostridium bacteria inactivation in wastewaters by a pilot photolysis process and by the maturation lagoons of a low-cost nature-based WWTP. Environ Sci Pollut Res 29, 35484–35499. https://doi.org/10.1007/s11356-021-18184-w
Resumen
[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.
URI
ISSN
0944-1344
DOI
10.1007/s11356-021-18184-w
Versión del editor
Colecciones
Patrocinador
Publicación en abierto financiada por el Consorcio de Bibliotecas Universitarias de Castilla y León (BUCLE), con cargo al Programa Operativo 2014ES16RFOP009 FEDER 2014-2020 DE CASTILLA Y LEÓN, Actuación:20007-CL - Apoyo Consorcio BUCLE.
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