US4882069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the treatment of sewage and other impure water
Assignee: Continental Manufacturing and Sales Inc
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Filing: 1988-08-05
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Granted: 1989-11-21
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Expires: 2008-08-05
Abstract
Abstract A method is provided herein for the treatment of sewage or other impure water. The method includes adding, to the sewage or other impure water in a mixing zone, all three individually but no more than two premixed together of the following: (a) an inorganic coagulant, (b) an anionic polymer, and (c) a cationic polymer, with intimate mixing of the added chemicals with the sewage or other impure water, with the proviso that (d) the inorganic coagulant, either alone or with the anionic polymer or the cationic polymer, cannot be added last; and (e) the anionic polymer and the cationic polymer cannot be intimately mixed and added together. This provides chemically-treated effluent having large, compact, firmly bonded, substantially-shear resistant and rapidly-separatable flocs therein. The flocs are separated from the liquid in a separating zone. Finally treated effluent effluent is removed from the separating zone.
Inventors
- 👤 Anton P. Pohoreski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:40
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F1/5236; C02F1/5281
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
190 words
A method for the treatment of sewage or other impure water which comprises: (1) adding and with intimate mixing to said sewage or other impure water in a mixing zone components: (a) an inorganic coagulant which comprises an aluminum salt or an iron salt in an amount of from about 10 to 300 ppm parts by weight, (b) an anionic acrylamide polymer polyectrolyte in an amount of from about 0.1-10 ppm parts by weight, and (c) a cationic amine or acrylamide polymer polyelectrolyte in an amount of from about 0.1-10 ppm parts by weights, wherein all three components are individually mixed but no more than two of said components are premixed together; with the proviso that said inorganic coagulant either alone or with the anionic polyelectrolyte or the cationic polyelectrolyte cannot be added last; and said anionic polyelectrolyte and said cationic polyelectrolyte cannot be intimately mixed and added together, thereby to provide a chemically-treated liquid effluent having large, compact, firmly-bonded, substantially-shear resistant and rapidly-separable flocs therein; (2) separating the flocs from the chemically-treated liquid effluent in a separating zone; and (3) removing said chemically-treated liquid effluent from the separating zone.
Claim 2
Independent Claim
190 words
A method for the treatment of sewage or other impure water which comprises: (1) adding and with intimate mixing to said sewage or other impure water in a mixing zone components: (a) an inorganic coagulant which comprises an aluminum salt or an iron salt in an amount of from about 10 to 300 ppm parts by weight, (b) an anionic acrylamide polymer polyectrolyte in an amount of from about 0.1-10 ppm parts by weight, and (c) a cationic amine or acrylamide polymer polyelectrolyte in an amount of from about 0.1-10 ppm parts by weights, wherein all three components are individually mixed but no more than two of said components are premixed together; with the proviso that said inorganic coagulant either alone or with the anionic polyelectrolyte or the cationic polyelectrolyte cannot be added last; and said anionic polyelectrolyte and said cationic polyelectrolyte cannot be intimately mixed and added together, thereby to provide a chemically-treated liquid effluent having large, compact, firmly-bonded, substantially-shear resistant and rapidly-separable flocs therein; (2) separating the flocs from the chemically-treated liquid effluent in a separating zone; and (3) removing said chemically-treated liquid effluent from the separating zone.
Claim 3
Dependent Claim
21 words
The method of claim 1, wherein said flocs are separated from said chemically treated liquid effluent by settling as a sludge.
Claim 4
Dependent Claim
14 words
The method of claim 2, wherein said sludge is recycled to said mixing zone.
Claim 5
Dependent Claim
38 words
The method of claim 1, which is characterized by the following sequential steps: first adding the anionic polyelectrolyte of component (b), then adding the inorganic coagulant of component (a) and finally adding the cationic polyelectrolyte of component (c).
Claim 6
Dependent Claim
17 words
The method of claim 4, wherein said inorganic coagulant of component (2) is alum or ferric chloride.
Claim 7
Dependent Claim
38 words
The method of claim 5, wherein said anionic acrylamide polymer polyelectrolyte of component (b) is a polyacrylamide with negative acrylate groups and said cationic amine or acrylamide polymer polyelectrolyte of component (c) is a polyamine or a polyacrylamide.
Claim 8
Dependent Claim
21 words
The method of claim 4, wherein said anionic acrylamide polymer polyelectrolyte of component (b) is a polyacrylamide with negative acrylate groups.
Claim 9
Dependent Claim
22 words
The method of claim 4, wherein said cationic amine or acrylamide polymer polyelectrolyte of component (c) is a polyamine or a polyacrylamide.
Claim 10
Dependent Claim
38 words
The method of claim 1, which is characterized by the following sequential steps: first adding the cationic polyelectrolyte of component (c), then adding the inorganic coagulant of component (a), and finally adding the anionic polyelectrolyte of component (b).
Claim 11
Dependent Claim
17 words
The method of claim 9, wherein said inorganic coagulant of component a is alum or ferric chloride.
Claim 12
Dependent Claim
38 words
The method of claim 10, wherein said anionic acrylamide polymer polyelectrolyte of component (b) is a polyacrylamide with negative acrylate groups and said cationic amine or acrylamide polymer polyelectrolyte of component (c) is a polyamine or a polyacrylamide.
Claim 13
Dependent Claim
21 words
The method of claim 9, wherein said anionic acrylamide polymer polyelectrolyte of component (b) is a polyacrylamide with negative acrylate groups.
Claim 14
Dependent Claim
22 words
The method of claim 9, wherein said cationic amine or acrylamide polymer polyelectrolyte of component (c) is a polyamine or a polyacrylamide.
Claim 15
Dependent Claim
37 words
The method of claim 1, characterized by the following sequence of steps: first adding the inorganic coagulant of component (a), then adding the anionic polyelectrolyte of component (b) and finally adding the cationic polyelectrolyte of component (c).
Claim 16
Dependent Claim
17 words
The method of claim 14, wherein said inorganic coagulant of component a is alum or ferric chloride.
Claim 17
Dependent Claim
38 words
The method of claim 15, wherein said anionic acrylamide polymer polyelectrolyte of component (b) is a polyacrylamide with negative acrylate groups and said cationic amine or acrylamide polymer polyelectrolyte of component (c) is a polyamine or a polyacrylamide.
Claim 18
Dependent Claim
21 words
The method of claim 14, wherein said anionic acrylamide polymer polyelectrolyte of component (b) is a polyacrylamide with negative acrylate groups.
Claim 19
Dependent Claim
22 words
The method of claim 14, wherein said cationic amine or acrylamide polymer polyelectrolyte of component (c) is a polyamine or a polyacrylamide.
Claim 20
Dependent Claim
40 words
The method of claim 1, characterized by the following sequence of steps: first adding a homogeneous mixture of the inorganic coagulant of component (a) and the cationic polyelectrolyte of component (c), and finally adding the anionic polyelectrolyte of component (b).
Claim 21
Dependent Claim
17 words
The method of claim 19, wherein said inorganic coagulant of component a is alum or ferric chloride.
Claim 22
Dependent Claim
38 words
The method of claim 20, wherein said anionic acrylamide polymer polyelectrolyte of component (b) is a polyacrylamide with negative acrylate groups and said cationic amine or acrylamide polymer polyelectrolyte of component (c) is a polyamine or a polyacrylamide.
Claim 23
Dependent Claim
21 words
The method of claim 19, wherein said anionic acrylamide polymer polyelectrolyte of component (b) is a polyacrylamide with negative acrylate groups.
Claim 24
Dependent Claim
22 words
The method of claim 19, wherein said cationic amine or acrylamide polymer polyelectrolyte of component (c) is a polyamine or a polyacrylamide.
Claim 25
Dependent Claim
40 words
The method of claim 1, characterized by the following sequence of steps: first adding a homogeneous mixture of the inorganic coagulant of component (a) and the anionic polyelectrolyte of component (b), and finally adding the cationic polyelectrolyte of component (c).
Claim 26
Dependent Claim
17 words
The method of claim 24, wherein said inorganic coagulant of component a is alum or ferric chloride.
Claim 27
Dependent Claim
38 words
The method of claim 25, wherein said anionic acrylamide polymer polyelectrolyte of component (b) is a polyacrylamide with negative acrylate groups and said cationic amine or acrylamide polymer polyelectrolyte of component (c) is a polyamine or a polyacrylamide.
Claim 28
Dependent Claim
21 words
The method of claim 24, wherein said anionic acrylamide polymer polyelectrolyte of component (b) is a polyacrylamide with negative acrylate groups.
Claim 29
Dependent Claim
22 words
The method of claim 24, wherein said cationic amine or acrylamide polymer polyelectrolyte of component (c) is a polymer or a polyacrylamide.
Claim 30
Dependent Claim
17 words
The method of claim 1, wherein said inorganic coagulant of component (a) is alum or ferric chloride.
Claim 31
Dependent Claim
21 words
The method of claim 1, wherein said anionic acrylamide polymer polyelectrolyte of component (b) is a polyacrylamide with negative acrylate groups.
Claim 32
Dependent Claim
22 words
The method of claim 1, wherein said cationic amine or acrylamide polymer polyelectrolyte of component (c) is a polyamine or a polyacrylamide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |