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  • Seawater sterilizing system

Seawater sterilizing system

Since customers pay more attentions to processing hygienes and demands the qualifications like HACCP, the mandatory condition of permitting a processing factory, a sterilizing and purifying water system is no longer optional but obligatory.

Seawater used in the various seafood’s production process used simple precipitation process or easily filtered seawater, but because of the customer’s increasing attention about hygienic process and demand for the HACCP qualification, the processing factory’s condition of permission, sterilizing and filtering system is becoming necessary nowadays.

Vibrio sepsis, an epidemic, is a vibrio cholera and vibrio vulnificus that causes an illness to the human body stakes out from January to April, when the temperature of the seawater is below than 15℃, began to be detected from May from seawater and mud when the temperature of the seawater is higher than 17℃. But it isn’t sterilized when processed at -20℃ and 4℃, and the regulation is lax so that the regulating number of colon bacillus is same as that of sewage effluent. Businesses are leaving it alone, because they have no duty to install sterilizing device, but installation of seawater sterilizing device is necessary to assure food safety.

Seawater’s sterilizing effect for the sepsis appeared to be great when used photocatalysis. Sterilizing effect of photocatalysis sterilizing system for the salmonella germ, known as food poisoning causing germ, decreases 3log from primary number of germs of 107CFU/mL to 104CFU/mL in a minute of process, and completely became extinct in 20minutes of process. On the other hand, in the seawater without photocatalysis treatment, primary number of germs, 107CFU/mL, did not decreased at all when process more than 30minutes.

Sterilizing method using photocatalysis is easy to control the sterilization of microorganisms with simultaneous effect of powerful oxidation of OH-radical, and UV’s sterilizing power, easy to manage, and economic seawater sterilizing method.

Because norovirus is cultivated artificially, FCV of calici-virus with similar biochemical description and genome constitution with norovirus was used as an alternative virus. As a result of consideration of inactive effect for the photocalysis sterilizing system, in the case of being treated with photocalysis sterilizing system, Infectivity starts to fall after 30 seconds, and removed almost after 3minutes. Otherwise, infectivity of virus of normal seawater with big structure maintained after 10 minutes.

Changes in FCV Tier in the case of being treated by the photocatalytic sterilizing system
*TCID50: Infects 50 percent of tissue culture.

The sterilizing device made with seawater corrosion resistant metal is capable of being designed in small to big size, and also usable in semi-permanent terms (except consumables),but it has a weakness of high cost of manufacturing. Otherwise, sterilizing device made with PVC material is relatively cheap, and corrosion resistant, but hard to be designed in big size because it is susceptible to shock, and small size sterilizing device can suffer life-shortening.

  • Otherwise, sterilizing device made with PVC material is relatively cheap, and corrosion resistant, but hard to be designed in big size because it is susceptible to shock, and small size sterilizing device can suffer life-shortening. To promote the non-malformed spawning of abalone and production of abalone’s larval by incubating abalone at abalone farm, all-in-one seawater sterilizing filter system that has an ability to filer seawater, sterilizing and UV irradiationt treatment is being used at abalone spawning and growing farm. Method of removing impurities or alga in the seawater primarily with filter, and getting rid of germs when passing through the photocatalysis sterilizing device is easy to control and manage.

    Seawater sterilizing filter system at abalone farm
  • Seawater sterilizing system for the process of raw oyster Raw oyster must be cleaned with sterilized seawater, because it has to be provided to the customers as raw stuff. Sterilized seawater must be packed together with raw oyster to minimize the speed of growth of germs in the period of circulation. And introduction of the seawater sterilizing device to improve the freshness is necessary.

    Seawater sterilizing process with medicines like ozone and chlorine dioxide has abilities to sterilize germs adhering to the surface or raw oysters. But ozone not only sterilize germs but also change the original taste, smell and color by reacting to the tissue of the oyster with its’ strong power of oxidation.