DISINFECTION EFFECTIVENESS OF SLAKED LIME WITH NATRIUM CHLORIDE

Abstract

Veterinary practice constantly needs highly effective, environmentally friendly, economically viable, non-specific means of protecting of animals from infectious diseases. It is known that various disinfectants are used for disinfection by irrigation, including: 5% hot solution of soda ash, 3% hot emulsion of disinfecting creolin, 1-2% formaldehyde solution, 2% sodium hydroxide solution, 5% chloramine solution, 1% glutaric solution aldehyde and others, calculation 0.5-1.0 l/m2 of the surface of the objects of veterinary surveillance. The disadvantage of these disinfectants is that many of them are toxic for humans and animals, have very irritating actirn on the respiratory tract, as well as the mucous membranes of the eyes. Also is known a disinfectant calcium hydroxide (slaked lime) of 10-20% concentration for the disinfection of objects of veterinary surveillance. This tool in comparison with the above mentioned is not particularly toxic and environmentally unsafe for the environment. The disadvantage of slaked lime is the low bactericidal activity against infectious diseases of the 1,2,3 category of resistance. It was found that 10% and 15% solutions do not disinfect Escherichia coli (pcs. 1257) and Staphylococcus aureus (pcs. 209 r), and 20% solution of hydrated lime disinfects Escherichia coli only after cross-application in 3 hours on smooth surfaces (stainless steel, galvanized iron, tile) and after 24 hours on rough surfaces (wood, concrete), at the rate of 1.0 l/m2. To increase the bactericidal and disinfection activity, 1.3 and 5% sodium chloride solution was added to a solution of 20% slaked lime. In this case, calcium chloride (CaCl2) and sodium hydroxide (NaOH) are formed, which can increase the disinfection activity by increasing the ionic strength of slaked lime solution. As experiments showed, the addition of 1% solution of sodium chloride in 20% solution of hydrated lime contributed to the disinfection of Escherichia coli and Staphylococcus aureus for 3 hours of exposure at rate of 0.5 l/m2, and rough -for 3 hours, at a rate of 1.0 l/m2. When 3% sodium chloride solution was added to 20% slaked lime solution, disinfection of smooth surfaces from Escherichia coli occurred in 1 hour, on rough surfaces in 3 hours at the rate of 0.5 and 1.0 l/m2, respectively. Staphylococcus aureus was disinfected on smooth surfaces in 3 hours at a rate of 0.5 l/m2, and on rough surfaces in 3 hours at a rate of 1.0 l/m2.