The investigation of UV-C LED arrangement on the sterilization of Escherichia coli in flow reactors
Notice bibliographique
Résumé
In this study, a planar UV reactor with distinct UV-C LED arrangements was proposed to treat potable water.The particle tracing method combined with computational fluid dynamics were used to simulate water velocity field, microbial trajectory and exposure time.The ray tracing method was used to determine the irradiance distribution in water.The simulated variables were integrated to determine the distribution of fluence in water.UV light has been widely used in water sterilization processes because it is safe and simple and does not produce any unwanted by-products [1].UV-C LEDs have been used instead of mercury lamps in water disinfection processes because of their numerous advantages, such as their long lifespan, mercury-free design, tunable wavelength, and high design flexibility [2,3].The arrangement of UV-C LEDs substantially affects the light distribution and UV fluence to which microbes are subjected.However, if the distribution of light is not optimized, the performance of reactors employing UV LEDs may be lower than that of reactors employing traditional mercury lamps [4].According to studies on the application of UV-C LEDs in water disinfection in flow reactors, positively correlating the flow field with the irradiation distribution can aid in the design of highly efficient UV reactors.In this study, the effects of LED arrangement on the efficacy of a planar UV LED reactor for E. coli disinfection under various flow rates were investigated.In this experiment, E. coli IFO 3301 was used to validate the water disinfection performance of the reactor.The bacteria were cultured on NZCYM broth supplemented with deionized water and grown in an incubator.To determine the reactor's sterilization performance, plate counting was used with irradiated and nonirradiated water.The inactivation kinetic was defined using the first linear model [5].Both experimental and theoretical results among the distinct UV light modules used in this study, turn-enhanced emission exhibited the highest efficiency in sterilizing E. coli owning to the synergic effect of hydrodynamics and UV radiation.Turn-enhanced emission combined with turn-induced secondary flow effectively improved the reactor performance.At a flow rate of 300 mL/min, turn-enhanced emission resulted in an inactivation value of 4.6 log, which was approximately 21.9%, 19.3%, 19.9%, and 111.2% higher than the values obtained with top, staggered, lined, and side emission, respectively.According to the particle count and cumulative count of the fluid particles, turn-enhanced emission effectively enhanced the UV fluence to which microbes in water were subjected.In conclusion, optimal combinations of LED arrangements and channel configurations effectively improve the sterilization efficiency of UV reactors.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».