Abstract
A method for providing a controlled atmosphere in a food storage facility, which comprises: a) feeding a portion of an atmosphere from a food storage facility, containing carbon dioxide, oxygen and nitrogen, to a feed side of a membrane having a higher permeability to carbon dioxide than to nitrogen, b) recycling the carbon dioxide, oxygen and nitrogen not permeating the membrane back to the storage facility, and venting the carbon dioxide-enriched gas permeating the membrane to the atmosphere, and c) using a membrane-based system to maintain the required atmospheric composition and pressure in the food storage facility.
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