INACTIVATION OF PATHOGENIC CYST-FORMING MICROORGANISM IN LIQUID

• Main Authors: YAMAUCHI KAZUO, KUROKAWA KENICHI, KIMATA ISAO, KUNITOMO SHINTA, SASAKI KENICHI, IZEKI MOTOHIRO, IGARASHI CHIAKI
• Format: Patent
• Language: English
• Published: 05.09.2000
• Edition: 7
• Subjects: CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; FOODS OR FOODSTUFFS; FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BYSUBCLASSES A23B - A23J; HUMAN NECESSITIES; HYGIENE; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES; MEDICAL OR VETERINARY SCIENCE; METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OFNUTRITIVE QUALITIES, PHYSICAL TREATMENT; THEIR TREATMENT, NOT COVERED BY OTHER CLASSES

PROBLEM TO BE SOLVED: To simply inactivate pathogenic cyst forming microorganisms in a liquid to obtain drinking water having excellent safety without adopting a heating method or without using a chemical agent by pressurizing the liquid containing the pathogenic cyst-forming microorganisms. SOLUTION: This method for inactivating pathogenic cyst-forming microorganisms in a liquid comprises pressurizing the liquid, such as water, containing pathogenic cyst-forming microorganisms such as Cryptosporidium at a pressure of >=1,500 kgf/cm2 for a pressurization time of >=5 min or at a pressure of >=2,000 kgf/cm2 for a pressurization time of >=2 min. The method for inactivating pathogenic cyst-forming microorganisms in a liquid preferably comprises storing the liquid containing the pathogenic cyst-forming microorganisms in a high pressure tank 4, pressurizing the liquid, and then releasing the high pressure liquid from a nozzle tip disposed at the top of the outflow pipe of the high pressure tank 4 into an ordinary pressure atmosphere, thus rapidly reducing the pressure to inactivate the pathogenic cyst-forming microorganisms in the liquid.