Abstract: The invention relates to a method for prolonging the shelf life of agricultural and food products placed in a large storage room having a volume greater than 200 m3, wherein said method comprises treating the air in said storage room by means of withdrawing air from the storage room, passing the air through a gas-liquid contactor, circulating an electrolyzed halide solution through said gas-liquid contactor, directing the treated air back into the storage room, wherein an acid is intermittently added to said circulated halide solution. An apparatus suitable for carrying out the method is also provided.

Abstract: A method for reducing the biological contamination of indoor air and sanitizing the walls and surfaces in a closed space, which method comprises causing a stream of air to flow upwardly through a treatment zone, and to contact, on a substantially horizontally aligned perforated surface, with a stream of brine solution having Redox potential of not less than 500 mV, whereby an active layer is formed on said horizontally aligned perforated surface, in which layer the brine and air mix, and delivering the treated air which exits said treatment zone into the space to be sanitized.

Abstract: A method for reducing biological contamination of indoor air, which method includes providing a concentrated salt solution, which is either (i) a brine capable of responding to aeration thereof by a rapid increase of its Redox potential, wherein the rate of said increase is greater than the rate of increase observed for a 45% (w/w) calcium chloride solution subjected to identical aeration conditions; or (ii) a brine which is passed through an electrolytic cell in order to raise its Redox potential; circulating said concentrated salt solution through a treatment zone; causing a stream of biologically contaminated air to flow through said treatment zone, such that said contaminated air is contacted with said salt solution in said treatment zone; and withdrawing purified air from said treatment zone.

Abstract: A method for prolonging the shelf life of agricultural and food products is provided, especially fruit and vegetables, which method comprises forcing a stream of air to flow upwardly through a treatment zone, such that it comes into contact with a stream of an aqueous salt solution having Redox potential of not less than 200 mV on a substantially horizontally aligned perforated surface, thereby forming a layer of bubbling liquid located above said surface, and delivering the treated air which exits said treatment zone into a storage room in which said agricultural or food products are placed.

Abstract: A method for reducing biological contamination of indoor air, which method includes providing a concentrated salt solution, which is either (i) a brine capable of responding to aeration thereof by a rapid increase of its Redox potential, wherein the rate of said increase is greater than the rate of increase observed for a 45% (w/w) calcium chloride solution subjected to identical aeration conditions; or (ii) a brine which is passed through an electrolytic cell in order to raise its Redox potential; circulating said concentrated salt solution through a treatment zone; causing a stream of biologically contaminated air to flow through said treatment zone, such that said contaminated air is contacted with said salt solution in said treatment zone; and withdrawing purified air from said treatment zone.