Methods for treating odors
There are provided methods for treating a fluid having an undesirable odor. The methods comprise contacting the fluid with a H 2 O 2 basic aqueous oxidizing composition and/or with a H 2 O 2 acidic aqueous oxidizing composition. Optionally, the fluid can be further treated by contacting it with activated carbon and/or by submitting the fluid and the composition to UV radiation when they are contacting together.
1. An acidic aqueous oxidizing composition comprising at least one cation of a metal chosen from Fe, Cu, Ni, Mn, Ti, Cr, Ce, Zn, Pd, Mo, and mixtures thereof, H 2 O 2 , and oxalic acid, wherein said acidic aqueous oxidizing composition has a pH of about 1.5 to less than 3.0.
2. The composition of claim 1 , wherein said composition comprises a metal cation of Fe.
3. The composition of claim 1 , wherein said composition comprises Fe 2+ .
4. The composition of claim 3 , wherein said composition comprises FeSO 4 .
5. The composition of claim 3 , wherein said acidic aqueous oxidizing composition has a pH of about 1.5 to about 2.0.
6. The composition of claim 3 , wherein said acidic aqueous oxidizing composition has a pH of about 2.0 to less than 3.0.
7. The composition of claim 3 , wherein said acidic aqueous oxidizing composition has a pH of about 1.8 to about 2.4.
8. The composition of claim 3 , wherein said acidic aqueous oxidizing composition has a pH of about 2.2 to about 2.6.
9. The composition of claim 3 , wherein said acidic aqueous oxidizing composition has a pH of about 2.5 to less than 3.0.
10. The composition of claim 3 , wherein said acidic aqueous oxidizing composition has a pH of about 2.5 to about 2.8.
11. A method of using the composition of claim 3 , wherein said method comprises contacting said composition with a gas having an undesirable odor so as to treat said gas.
12. An acidic aqueous oxidizing composition comprising at least one cation of a metal chosen from Fe, Cu, Ni, Mn, Ti, Cr, Ce, Zn, Pd, Mo, and mixtures thereof, H 2 O 2 , and a sequestering agent chosen from ethylenediaminetetraacetic acid, oxalic acid, citric acid, glycine, NTA, salicylic acid, sulfosalicylic acid, trithylenetetramine, and mixtures thereof, wherein said acidic aqueous oxidizing composition has a pH of about 1.5 less than 3.0.
13. The composition of claim 12 , wherein said composition comprises Fe 2+ .
14. The composition of claim 13 , wherein said acidic aqueous oxidizing composition has a pH of about 1.5 to about 2.0.
15. The composition of claim 13 , wherein said acidic aqueous oxidizing composition has a pH of about 2.0 to less than 3.0.
16. The composition of claim 13 , wherein said acidic aqueous oxidizing composition has a pH of about 1.8 to about 2.4.
17. The composition of claim 13 , wherein said acidic aqueous oxidizing composition has a pH of about 2.2 to about 2.6.
18. The composition of claim 13 , wherein said acidic aqueous oxidizing composition has a pH of about 2.5 to less than 3.0.
19. The composition of claim 13 , wherein said acidic aqueous oxidizing composition has a pH of about 2.5 to about 2.8.