Method for disinfecting a room and objects contained therein and disinfecting composition

1. A method for disinfecting a room and the objects that may be contained therein, including the following steps:

(a) determining the volume of the room to be disinfected;

(b) as a function of the value determined in step a) above, determining a volumetric concentration of an aqueous disinfecting solution delivered into the room in the form of a dry mist required for obtaining a predefined level of disinfection, said disinfecting solution comprising hydrogen peroxide and silver ions (Ag + );

(c) delivering into the room said aqueous disinfecting solution in the form of a dry mist until the desired volumetric concentration is achieved;

(d) keeping said aqueous disinfecting solution in the form of a dry mist in contact with the room and with the objects that may be contained therein for a predefined time, so as to achieve a desired level of disinfection, wherein said aqueous disinfecting solution comprises:

(a) 2 to 30% by weight of hydrogen peroxide;

(b) 20 to 140 mg/kg of silver ions (Ag + );

(c) 10 to 250 mg/kg of phosphate and/or hydrogen phosphate ions;

(d) 0.1 to 2 g/kg of at least one non-ionic surfactant selected from: ethoxylated fatty alcohols, ethoxylated fatty acids, esters of ethoxylated fatty acids, or mixture thereof.

2. The method according to claim 1 , further including, before step (b), the step of:

(a′) determining the type and degree of microorganism contamination of the room, as a function of which step (b) can be carried out.

3. The method according to claim 1 , wherein the volumetric concentration of the disinfecting solution in the form of dry mist is in the range from 1 to 30 ml/m 3 .

4. The method according to claim 1 , wherein the dry mist of disinfecting solution consists of microdroplets with an average size below 5 μm.

5. The method according to claim 1 , wherein the step of delivery of the disinfecting solution into the room is carried out with a spraying device having a delivery rate in the range from 70 m/sec to 90 m/sec, and with a pressure, measured on the outlet nozzle, selected so as to obtain the delivery of the disinfecting solution in the form of a dry mist at a temperature of from 35° C. to 40° C.

6. The method according to claim 1 , wherein during step (d) the contact time of the disinfecting solution in the form of dry mist with the room to be disinfected is of 5 minutes to 20 minutes.

7. The method according to claim 1 , wherein the disinfecting solution is an aqueous disinfecting solution comprising:

(a) 2 to 30% by weight of hydrogen peroxide;

(b) 20 to 140 mg/kg of silver ions (Ag + );

(c) 10 to 250 mg/kg of phosphate and/or hydrogen phosphate ions;

(d) 0.1 to 2 g/kg of at least one non-ionic surfactant.

8. An aqueous disinfecting solution comprising:

(a) 2 to 30% by weight of hydrogen peroxide;

(b) 20 to 140 mg/kg of silver ions (Ag + );

(c) 10 to 250 mg/kg of phosphate and/or hydrogen phosphate ions;

(d) 0.1 to 2 g/kg of at least one non-ionic surfactant selected from: ethoxylated fatty alcohols, ethoxylated fatty acids, esters of ethoxylated fatty acids, or mixture thereof.

9. The aqueous disinfecting solution according to claim 8 , comprising:

(a) 3 to 10% by weight of hydrogen peroxide;

(b) 40 to 120 mg/kg of silver ions (Ag + );

(c) 20 to 200 mg/kg of phosphate and/or hydrogen phosphate ions;

(d) 0.1 to 2 g/kg of at least one non-ionic surfactant selected from: ethoxylated fatty alcohols. ethoxylated fatty acids, esters of ethoxylated fatty acids, or mixture thereof.

10. The aqueous disinfecting solution according to claim 8 , comprising:

(a) 5 to 30% by weight of hydrogen peroxide;

(b) 20 to 100 mg/kg of silver ions (Ag + );

(c) 10 to 40 mg/kg of phosphate and/or hydrogen phosphate ions;

(d) 0.1 to 2 g/kg of at least one non-ionic surfactant selected from: ethoxylated fatty alcohols, ethoxylated fatty acids, esters of ethoxylated fatty acids, or mixture thereof.

11. The aqueous disinfecting solution according to claim 10 , comprising:

(a) 10 to 20% by volume of hydrogen peroxide;

(b) 30 to 60 mg/kg of silver ions (Ag + );

(c) 15 to 30 mg/kg of phosphate and/or hydrogen phosphate ions;

(d) 0.1 to 2 g/kg of at least one non-ionic surfactant selected from: ethoxylated fatty alcohols, ethoxylated fatty acids, esters of ethoxylated fatty acids, or mixture thereof.

12. The disinfecting solution according to claim 8 , wherein the silver ions are added in the form of a soluble salt.

13. The disinfecting solution according to claim 8 , wherein the phosphate and/or hydrogen phosphate ions are introduced into the disinfecting solution by addition of a water-soluble phosphate and/or hydrogen phosphate.

14. The disinfecting solution according to claim 8 , wherein the phosphate and/or hydrogen phosphate ions are introduced into the disinfecting solution by addition of phosphoric acid H 3 PO 4 .

15. The disinfecting solution according to claim 8 , further comprising at least one complex phosphate or phosphonate in an amount ranging from 0 to 300 mg/kg.

16. The disinfecting solution according to claim 15 , wherein said at least one complex phosphate or phosphonate is selected among: potassium pyrophosphate, sodium orthophosphate, sodium tripolyphosphate, sodium hexametaphosphate, sodium hydroxyethylidendiphosphonate and analogs, and mixtures thereof.

17. The disinfecting solution according to claim 8 , wherein said at least one non-ionic surfactant has an ethoxylation degree of 7 to 30.

18. The disinfecting solution according to claim 8 , further comprising copper ions and/or zinc ions.

19. The disinfecting solution according to claim 8 , said solution being substantially free of chloride ions.

20. A method for disinfecting a room, the objects that may be contained therein, or a medical device by delivering an aqueous disinfecting solution according to claim 8 in the form of a dry mist.