Ozone microbial inactivation

An alfemative way to model microbial inactivation by means of HP nof using the first order kinetics model is the model of Fermi. This model demonsfrates fhat population decreases because of exposure fo lefhal agents such as heat, electric pulses, and radiation or ozone doses. The equation of Fermi relates the fraction of survivors S(P), fhe pressure applied P (MPa), the critical pressure Pc at which the survivors fraction is 0.5, and the constant k that indicates the rate at which inactivation is occurring (Palou et al., 1998). 

Erkan A, Bakir U, Karakas G (2006) Photocatalytic microbial inactivation over Pd doped SnOi and TiOi thin films. J Photochem Photobiol A Chem 184(3) 313-321 Evgenidou E, Fytianos K, Poidios I (2005) Semiconductor-sensitized photodegradation of dichlor-vos in water using TiOj and ZnO as catalysts. Appl Catal Environ 59(l-2) 81-89 Farooq S et al (1977) The effect of ozone bubbles on disinfection. Water Ozone Sci Eng 9(2) 233 Fiscetti M (2007) Fresh from the sea. Sci Am 297 118-119... 

Ozone is a strong anti-microbial agent with several potential applications in the food industry. High reactivity and spontaneous decomposition to a non-toxic product (i.e. Oxygen) make it a viable disinfectant, ensuring microbial safety of food products (Fisher et al. 2000 Kim et al. 1999 Restaino et al. 1995 Horvath et al. 1985). It is recognized as safe (GRAS). It can be used as a gas or mixed in water. It was successfully used to inactivate mycotoxins, pesticide residues. 

The primary purpose of disinfection is to kiU or inactivate the remaining pathogens. The second purpose is to provide a disinfectant residual in the finished water and prevent microbial regrowth in the distribution systems. Chlorine, chloramines, ozone, chlorine dioxide, and ultraviolet radiation are the common disinfectants used in water treatment plants. 

Ozone exhibits a 100% bacteriological effect at concentrations of 0.023 mg/1 without producing spores. Spores are destroyed at 0.61 mg/1 [247], At the same concentration, 87.5% of the hepatic virus B is inactivated. Large amounts of blood can be conserved without clotting by bubbling with oxygen-ozone mixture. Parallel to this, all the microbial materials in blood are oxidized, thus sterilizing it [266]. 

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