METHOD 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 . A method for treating a fluid having an undesirable odor, said method comprising:
contacting said fluid with a basic 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 and H 2 O 2 ; and
contacting said fluid with 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 and H 2 O 2 ,
said fluid being contacted with said basic aqueous oxidizing composition, and then said fluid being contacted with said acidic aqueous oxidizing composition; or
said fluid being contacted with said acidic aqueous oxidizing composition, and then said fluid being contacted with said basic aqueous oxidizing composition.
2 . The method of claim 1 wherein, said fluid is treated with said basic aqueous oxidizing composition so as to at least partially oxidize at least one compound responsible for said undesirable odor and then said fluid is treated with said acidic aqueous oxidizing composition so as to at least partially oxidize at least one compound responsible for said undesirable odor, thereby at least partially reducing intensity of said undesirable odor.
3 . The method of claim 1 wherein, said fluid is treated with said acidic aqueous oxidizing composition so as to at least partially oxidize at least one compound responsible for said undesirable odor and then said fluid is treated with said basic aqueous oxidizing composition so as to at least partially oxidize at least one compound responsible for said undesirable odor, thereby at least partially reducing intensity of said undesirable odor.
4 . The method of claim 2 , wherein said basic aqueous oxidizing composition comprises a base chosen from NaOH, KOH, Mg(OH) 2 , Ca(OH) 2 , NaHCO 3 , Na 2 CO 3 , K 2 CO 3 , KHCO 3 , and mixtures thereof.
5 - 7 . (canceled)
8 . The method of claim 1 , wherein said basic aqueous oxidizing composition has a pH of about 9.5 to about 10.5.
9 . The method of claim 2 , wherein said basic aqueous oxidizing composition has a pH of about 9.7 to about 10.0.
10 . (canceled)
11 . The method of claim 8 , wherein said basic aqueous oxidizing composition further comprises a sequestering agent.
12 . The method of claim 11 , wherein said sequestering agent is chosen from diethylenetriaminepentaacetic acid (DTPA), nitrolotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), sodium hexametaphosphate, sodium citrate, and mixtures thereof.
13 - 17 . (canceled)
18 . The method of claim 11 , wherein said sequestering agent is present in said basic aqueous oxidizing composition at a concentration of about 60 mg/L to about 240 mg/L.
19 . The method of claim 11 , wherein said basic aqueous oxidizing composition comprises Fe 2+ , Cu 2+ , or a mixture thereof.
20 - 24 . (canceled)
25 . The method of claim 8 , wherein H 2 O 2 is present in said basic aqueous oxidizing composition at a concentration of about 20 mg/L to about 2000 mg/L.
26 . (canceled)
27 . The method of claim 8 , wherein said contacting includes mixing said fluid with said basic aqueous oxidizing composition so as to at least partially dissolve at least one compound contained in said fluid into said basic aqueous oxidizing composition.
28 - 31 . (canceled)
32 . The method of claim 4 , wherein said acidic aqueous oxidizing composition comprises an acid chosen from H 2 SO 4 , HCl, HNO 3 , H 3 PO 4 , and mixtures thereof.
33 - 35 . (canceled)
36 . The method of claim 8 , wherein said acidic aqueous oxidizing composition has a pH of about 2.0 to about 3.0.
37 . The method of claim 9 , wherein said acidic aqueous oxidizing composition has a pH of about 2.2 to about 2.6.
38 - 50 . (canceled)
51 . The method of claim 25 , wherein H 2 O 2 is present in said acidic aqueous oxidizing composition at a molar ratio H 2 O 2 :metal of about 10:1 to about 100:1.
52 . (canceled)
53 . The method of claim 36 , wherein said acidic aqueous oxidizing composition comprises Fe 2+ , Cu 2+ , or a mixture thereof.
54 - 60 . (canceled)
61 . The method of claim 37 , wherein said fluid comprises at least one organic compound chosen from carboxylic acids, thiols, thioethers, disulfides, alcohols, aldehydes, amines, amides and mixtures thereof.
62 - 64 . (canceled)
65 . The method of claim 2 , further comprising submitting said fluid and said acidic aqueous oxidizing composition to UV radiation, when said fluid and said acidic aqueous oxidizing composition are contacting each other.
66 . (canceled)
67 . The method of claim 1 , wherein said fluid is contacted with said acidic aqueous oxidizing composition so as to at least partially dissolve at least one compound responsible for said undesirable odor and contained in said fluid into said acidic aqueous oxidizing composition and wherein said method further comprises submitting, said at least one compound that is at least partially dissolved into said acidic aqueous oxidizing composition, to UV radiation.
68 . (canceled)
69 . A method for treating a fluid having an undesirable odor, said method comprising:
contacting said fluid with 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 and H 2 O 2 ; and
submitting said fluid and said composition to UV radiation when said fluid and said composition are contacting each other.
70 . (canceled)
71 . A method for treating a fluid having an undesirable odor, said method comprising:
contacting said fluid with a basic 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 and H 2 O 2 ; and/or contacting said fluid with 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 and H 2 O 2 ; and
contacting said fluid with activated carbon.
72 - 78 . (canceled)
79 . The method of claim 1 , wherein said treatment permits to reduce by at least 70% intensity of said undesirable odor.
80 . (canceled)
81 . The method of claim 65 , wherein said treatment permits to reduce by at least 85% intensity of said undesirable odor.
82 - 89 . (canceled)
90 . The method of claim 1 , further comprising at least one of (i) submitting said fluid and said acidic aqueous oxidizing composition to UV radiation, when said fluid and said acidic aqueous oxidizing composition are contacting each other; and (ii) submitting said fluid and said basic aqueous oxidizing composition to UV radiation, when said fluid and said basic aqueous oxidizing composition are contacting each other.
91 . 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, and wherein said composition has a pH of about 1.5 to about 4.0.
92 . The composition of claim 91 , wherein said composition comprises at least one cation of Fe, H 2 O 2 , and oxalic acid, and wherein said composition has a pH of about 1.5 to about 3.0.
93 . The composition of claim 91 , wherein said composition comprises Fe 2+ , H 2 O 2 , and oxalic acid, and wherein said composition has a pH of about 1.8 to about 2.4.
94 . An acidic aqueous composition comprising at least one cation of a metal chosen from Fe, Cu, Ni, Mn, Ti, Cr, Ce, Zn, Pd, Mo, and mixtures thereof and a sequestering agent chosen from ethylenediaminetetraacetic acid, oxalic acid, citric acid, glycine, NTA, salicylic acid, sulfosalicylic acid, trithylenetetramine, and mixtures thereof, and wherein said composition has a pH of about 1.5 to about 2.5.
95 . The composition of claim 94 , wherein said composition comprises Fe 2+ , H 2 O 2 , and oxalic acid, and wherein said composition has a pH of about 1.8 to about 2.4.