Abstract: Apparatus for treating items with a treatment gas to decontaminate the items includes a chamber which receives the items. The chamber has a gas inlet in fluid communication with a distribution duct positioned within the chamber. The duct distributes the treatment gas throughout the chamber to prevent gas stratification. The chamber may also have a gas outlet for exhausting the chamber, a treatment gas source providing gas, such as ozone, carbon dioxide, or other treatment gas to the chamber. A vacuum pump is used to lower the pressure within the chamber and a purge pump is used to flush the treatment gas from the chamber upon completion of the treatment. A liquid reservoir is used to maintain a desired humidity within the chamber. A heat exchanger is used to maintain a desired temperature within the chamber, and a fan is used to circulate the treatment gas within the chamber.

Abstract: A pulsed electric field treatment device for the sterilization and preservation of pumpable food products having a at least two electrodes and an insulator and particularly suited for the inactivation of vegetative and bacterial spore microorganisms. Each electrode includes an electrode flow chamber for making electrical contact with the pumpable food product and for allowing the pumpable food product to flow through the treatment device. The insulator is situated between the electrodes and includes an insulator flow chamber positioned between the electrode flow chambers and provides for the flow of pumpable food product from one electrode flow chamber to the other. A high voltage pulse generator applies a high voltage signal of variable voltage, frequency and pulse duration to the electrodes. The electrode and insulator flow chambers may employ a variety of sectional and cross-sectional geometries including tubular, cylindrical, rectangular, elliptical and non-uniform design.