US5039416A
Expired / Lapsed
US
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Process for the purification of industrial waste-waters
Assignee: Sandoz AG
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Filing: 1989-05-03
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Granted: 1991-08-13
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Expires: 2009-05-03
Abstract
Abstract The invention relates to a process for treating industrial waste water which comprises either: (a) pre-treating the waste water with at least two different pre-treatments selected from adsorption, membrane filtration and oxidation and then, biologically purifying the waste water or, (b) neutralizing and biologically purifying the waste water and then after-treating the waste water either by membrane filtation in combination with adsorption or oxidation or, by oxidation optionally in combination with adsorption or filtration on a nanofiltration membrane or, by filtration on a nanofiltration membrane.
Inventors
- 👤 Richard Loew
- 👤 Wolfgang Samhaber
- 👤 Anton Wyss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:06
CPC Classifications
C; C02; C02F; C02F9/00; C02F1/00; C02F1/28; C02F1/281; C02F1/283; C02F1/285; C02F1/42; C02F1/44; C02F1/442; C02F1/72; C02F1/722; C02F1/725; C02F1/76; C02F1/78; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/1231; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
71 words
A process for purifying waste-water which comprises carrying out, prior to biological purification, at least two different pre-treatment steps, one of said steps comprising membrane filtration on a nanofiltration membrane, and the other step being selected from: (a) adsorption and (b) oxidation by H 2 O 2 in the presence of catalytic amounts of a cation selected from copper, aluminum, zinc and iron, said steps being carried out in any order.
Claim 2
Dependent Claim
71 words
A process for purifying waste-water which comprises carrying out, prior to biological purification, at least two different pre-treatment steps, one of said steps comprising membrane filtration on a nanofiltration membrane, and the other step being selected from: (a) adsorption and (b) oxidation by H 2 O 2 in the presence of catalytic amounts of a cation selected from copper, aluminum, zinc and iron, said steps being carried out in any order.
Claim 3
Dependent Claim
16 words
A process according to claim 1 wherein the pre-treatment steps comprise adsorption followed by membrane filtration.
Claim 4
Dependent Claim
16 words
A process according to claim 1 wherein the pre-treatment steps comprise membrane filtration followed by oxidation.
Claim 5
Dependent Claim
36 words
A process according to claim 1 or 2 wherein adsorption is carried out by treating the waste water with a material selected from polystyrene and acrylic ester resins, metal oxides, ion exchanges, filtering earths and carbon.
Claim 6
Dependent Claim
13 words
A process according to claim 4 wherein the adsorption material comprises aluminum oxide.
Claim 7
Dependent Claim
55 words
A process according to claim 1 or 3 wherein in the oxidation step the cation is iron and is provided by a compound selected from Fe(OH) 3 , Fe 2 O 3 , FeCl 3 , Fe 2 (SO 4 ) 3 , FeO, Fe(OH) 2 , FeCl 2 and FeSO 4 .7H 2 O.
Claim 8
Dependent Claim
26 words
A process according to claim 6 wherein the oxidation step is carried out at pH 3 to 5 and at a temperature of from 20°-40° C.
Claim 9
Dependent Claim
34 words
A process according to claims 1, 2 or 3, in which the nanofiltration membrane is characterized by a retention capacity of NaCl of almost 0% and for Na 2 SO 4 of about 20%.
Claim 10
Dependent Claim
25 words
A process according to claim 8 wherein membrane filtration is effected under a pressure of 10 to 40 Bar, at a temperature of 20°-60° C.
Claim 11
Dependent Claim
15 words
A process according to claim 1, in which adsorption is carried out on active charcoal.
Claim 12
Dependent Claim
21 words
A process according to claim 1, in which the cation is Fe ++ as provided by FeSO 4 .7H 2 O.
Claim 13
Dependent Claim
29 words
A process according to claim 11, in which the molecular ratio between H 2 O 2 (35% V/V) and FeSO 4 .7H 2 O is from 30:1 to 3:1.
Claim 14
Dependent Claim
105 words
A process for purifying waste-water which comprises carrying out prior to biological purification the steps comprising: (1) membrane filtration on a nanofiltration membrane characterized by a retention capacity of NaCl of almost 0% and for Na 2 SO 4 of about 20% and (2) oxidation by H 2 O 2 in the presence of catalytic amounts of the cation Fe ++ in the form of FeSO 4 .7H 2 O, wherein the molecular ratio between H 2 O 2 (35% V/V) and FeSO 4 .7H 2 O is from 30:1 to 3:1, at pH of 2 to 12 and a temperature of from 20°-60° C.
Claim 15
Dependent Claim
105 words
A process for purifying waste-water which comprises carrying out prior to biological purification the steps comprising: (1) membrane filtration on a nanofiltration membrane characterized by a retention capacity of NaCl of almost 0% and for Na 2 SO 4 of about 20% and (2) oxidation by H 2 O 2 in the presence of catalytic amounts of the cation Fe ++ in the form of FeSO 4 .7H 2 O, wherein the molecular ratio between H 2 O 2 (35% V/V) and FeSO 4 .7H 2 O is from 30:1 to 3:1, at pH of 2 to 12 and a temperature of from 20°-60° C.
Claim 16
Dependent Claim
48 words
A process for purifying waste-water which comprises carrying out prior to biological purification the steps comprising: (1) adsorption on active charcoal, and (2) membrane filtration on a nanofiltration membrane characterized by a retention capacity of NaCl of almost 0% and for Na 2 SO 4 of about 20%.
Claim 17
Dependent Claim
48 words
A process for purifying waste-water which comprises carrying out prior to biological purification the steps comprising: (1) adsorption on active charcoal, and (2) membrane filtration on a nanofiltration membrane characterized by a retention capacity of NaCl of almost 0% and for Na 2 SO 4 of about 20%.
Claim 18
Dependent Claim
21 words
A process according to claims 1, 13 or 14 wherein biological purification is carried out in a waste water purification plant.
References Cited (Backward Citations)
FR1512555A
Cited
US3472765A
Cited
GB1439401A
Cited
US4005011A
Cited
US4073722A
Cited
US4066538A
Cited
US4178239A
Cited
US4294703A
Cited
EP0104648A2
Cited
EP0202387A2
Cited
JPS62244494A
Cited
JPS62289299A
Cited
EP0251691A2
Cited
US4956093A
Cited
US4765900A
Cited
US4812237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |