Actinometric and biodosimetric evaluation of UV-C dose delivery in annular, Taylor-Coutte and coiled tube continuous systems.
Food Sci Technol Int
; 23(3): 222-234, 2017 Apr.
Article
in En
| MEDLINE
| ID: mdl-27837034
ABSTRACT
In this study, the evaluation of the performance of two thin-film UV-C reactors (annular and Taylor-Couette) and a coiled tube system is presented using actinometry and biodosimetry methods. The iodide/iodate actinometry method was found suitable for comparison of the efficiency of UV-C dose delivery of the UV-C continuous flow systems. Inactivation kinetics of Escherichia coli ATCC 8739 in quarter-strength Ringer's solution (absorption coefficient α254 nm â¼ 0 cm-1) at various flow conditions at Reynolds numbers in the range of 26 to 3000 showed a good correlation between the different reactor types. In high UV-C absorbing liquids, the inactivation efficiency increases due to the improved radial mixing. The inactivation performance of the Taylor-Couette system correlates to the annular reactor when no rotation force is applied. The residence time distributions showed the narrowest distribution with the coiled tube system at comparable flow rates. The results indicate that, despite the laminar flow conditions, the performance of the Taylor-Couette unit becomes equal to the turbulent flow conditions of the coiled tube reactor by rotation of the inner cylinder.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Ultraviolet Rays
/
Disinfection
/
Bioreactors
/
Food Irradiation
Language:
En
Journal:
Food Sci Technol Int
Journal subject:
CIENCIAS DA NUTRICAO
Year:
2017
Document type:
Article
Affiliation country:
Germany