Perimetric Distributed UV Reactor and Its Validation and the Decontamination of Fresh Broccolis

Bruno Pereira De Oliveira,Vanderlei Salvador Bagnato,Daniel Chianfrone,Shirly Lara Pérez,Kate Cristina Blanco

doi:10.11648/j.ajac.20190706.12

Bruno Pereira De Oliveira, Vanderlei Salvador Bagnato + Show 3 more

Open Access

https://doi.org/10.11648/j.ajac.20190706.12

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Abstract

The ultraviolet (UV) irradiation as a non-thermal processing technique for microbial decontamination of food (MDF) has been the gainer in many variations after the inclusion of UV light as an alternative for MDF by the US FDA. However the lasts years increase the application of the UV light in food, water and pharmaceutical utilization. In this report, we describe a new type of reactor, where the UV emitters are parametrically distributed for decontaminating fresh broccolis. We described the constructed reactor and its characterization with the validation of the system with controlled contaminated broccolis. The overall liquid was contamined with 105 UFC/mL E. coli operating with a flow rate of 80 L/min in 30 L and six lamps in the reactor and the collection of samples in intervals of 25 min. The E. coli used in this experiment was eliminated in 99,99% The intensity of UVC light distributed in the internal part of the reactor is practically homogeneous due to the developed geometry. The kinetics of microbial death presented no great influence on this variation. That is, any volume of water contained in the process can be decontaminated. A relation between UV and the flow rate was stablished. The system demonstrated its capacity in inactivating the microorganism.

Highlights

The use of ultraviolet (UV) radiation as a non-thermal processing technique for microbial decontamination of food (MDF) has been the gainer in many variations after the inclusion of UV light as an alternative for MDF by the US FDA
An attractive alternative for this situation is the use of closed circuit water circulation with a stage of microbial inactivation using an efficient UV reactor
We describe a new type of reactor, where the UV emitters are parametrically distributed for decontaminating fresh broccolis

Summary

Introduction

The use of ultraviolet (UV) radiation as a non-thermal processing technique for microbial decontamination of food (MDF) has been the gainer in many variations after the inclusion of UV light as an alternative for MDF by the US FDA. An attractive alternative for this situation is the use of closed circuit water circulation with a stage of microbial inactivation using an efficient UV reactor. The water may remove the microorganisms that are inactivated followed by the return of the water to the circuit. That solution has many advantages: the volume used water is considerable decreased and the use of acid considerable reduced; in addition, the return of water to the environment causes no damage or needs a previous to discharge processing. Efficient UV reactor, dealing with charge water volume is necessary [2, 5, 6]

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