The invention discloses a casing
processing preservation method. The method comprises the processes of washing, immersing, scraping, flushing, water filling examination,
salting and storage; and in the storage process, casings are placed in a sealed container, an alkaline solution with the pH value of 11-13 is added into the container, a
mixed gas is finally introduced, and the
mixed gas comprises
carbon dioxide,
oxygen and
nitrogen. The casings obviously inhibit
bacteria causing casing corruption, comprising
Pseudomonas pseudoacaligenes,
Achromobacter sp, proteusbacillus vulgaris and the like in a
carbon dioxide gas with the concentration of 20-25%, can also avoid the promotion of the growth of
anaerobic bacteria comprising
Clostridium botulinum, Bacillus acidi lactic and the like due to too much
carbon dioxide, and cooperate with corresponding concentrations of
nitrogen and
oxygen to make the casings in suitable environment in order to inhibit deterioration and corruption, so storage freshness keeping is realized, thereby the preservation time is prolonged. The longest freshness keeping time is 20 months, and the casings have the characteristics of no oxidation, no heating or red phenomenon, and realization of the bacterial content reaching standards within the freshness keeping time.