Patent US4097377A successfully refreshed from Google Patents.
US4097377A
Expired / Lapsed
US
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Method of purification of waste water by treatment with zirconium salt
Assignee: Shikoku Paper Manufacturing Co
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Filing: 1975-12-22
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Granted: 1978-06-27
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Expires: 1995-12-22
Abstract
Abstract The present invention relates to a method of purification of waste water from chemical pulping and paper mills comprising coagulation and precipitation of suspended substances and colloidal dispersed particles, precipitation of non-colloidal dissolved, low molecular weight substances in the waste water and formation of water insoluble precipitates or chelates thereof, and further to a method of purification of waste water of any source of the use of zirconium salt.
Inventors
- 👤 Buichiro Ayukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:35
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; C02F1/72; Y; Y02; Y02W; Y02W10/00; Y02W10/30; Y02W10/37
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
83 words
A method of purification of waste water containing sewage including living sewage, food sewage, foam forming detergents, phosphates, carboxymethyl cellulose, lignin, sewage from mines, a dye, clay and colloidal aluminum, comprising coagulating and precipitating suspended substances and colloidal dispersed particles, and precipitating non-colloidal dissolved, low molecular weight, substances by adding an aqueous solution of ZrOCl 2 .8H 2 O to the said waste water, adjusting the pH to 4.5-6.8 to form water insoluble precipitates or chelates thereof and removing said precipitates and chelates.
Claim 2
Independent Claim
83 words
A method of purification of waste water containing sewage including living sewage, food sewage, foam forming detergents, phosphates, carboxymethyl cellulose, lignin, sewage from mines, a dye, clay and colloidal aluminum, comprising coagulating and precipitating suspended substances and colloidal dispersed particles, and precipitating non-colloidal dissolved, low molecular weight, substances by adding an aqueous solution of ZrOCl 2 .8H 2 O to the said waste water, adjusting the pH to 4.5-6.8 to form water insoluble precipitates or chelates thereof and removing said precipitates and chelates.
Claim 3
Dependent Claim
35 words
The method according to claim 1 in which the removal of non-colloidal dissolved, low molecular weight substances is conducted by the use of said aqueous solutions of ZrOCl 2 .8H 2 O after oxidation thereof.
Claim 4
Dependent Claim
17 words
The method according to claim 2 wherein the oxidation is conducted by irradiation with ultra violet light.
Claim 5
Dependent Claim
18 words
The method according to claim 1 in which one of the colloidal dispersed particles is an alkylbenzene sulfonate.
Claim 6
Dependent Claim
18 words
The method according to claim 1 in which one of the colloidal dispersed particles is a sulfated alcohol.
Claim 7
Dependent Claim
16 words
The method according to claim 1 in which one of the colloidal dispersed particles is casein.
Claim 8
Dependent Claim
16 words
The method according to claim 1 in which one of the colloidal dispersed particles is hemoglobin.
Claim 9
Dependent Claim
16 words
The method according to claim 1 in which one of the colloidal dispersed particles is gelatin.
Claim 10
Dependent Claim
16 words
The method according to claim 1 in which one of the colloidal dispersed particles is pectin.
Claim 11
Dependent Claim
16 words
The method according to claim 1 in which one of the colloidal dispersed particles is starch.
Claim 12
Dependent Claim
17 words
The method according to claim 1 in which one of the colloidal dispersed particles is carboxymethyl cellulose.
Claim 13
Dependent Claim
16 words
The method according to claim 1 in which one of the colloidal dispersed particles is xylan.
Claim 14
Dependent Claim
16 words
The method according to claim 1 in which one of the colloidal dispersed particles is lignin.
Claim 15
Dependent Claim
18 words
The method according to claim 1 in which one of the colloidal dispersed particles is lignin sulfonic acid.
Claim 16
Dependent Claim
16 words
The method according to claim 1 in which one of the colloidal dispersed particles is clay.
Claim 17
Dependent Claim
18 words
The method according to claim 1 in which one of the colloidal dispersed particles is colloidal dispersed aluminum.
Claim 18
Dependent Claim
21 words
The method according to claim 1 in which one of the non-colloidal dissolved substances is the aldose glucose, xylose or arabinose.
Claim 19
Dependent Claim
17 words
The method according to claim 1 in which one of the non-colloidal dissolved substances is a ketose.
Claim 20
Dependent Claim
20 words
The method according to claim 1 in which one of the non-colloidal dissolved substances is a disaccharide saccharose or lactose.
Claim 21
Dependent Claim
18 words
The method according to claim 1 in which one of the non-colloidal dissolved substances is a sugar alcohol.
Claim 22
Dependent Claim
26 words
The method according to claim 1 in which one of the non-colloidal dissolved substances is a sugar acid which is gluconic, glucuronic, mannuronic or galacturonic acid.
Claim 23
Dependent Claim
18 words
The method according to claim 1 in which one of the non-colloidal dissolved substances is an acidic dye.
Claim 24
Dependent Claim
33 words
The method according to claim 1 in which one of the non-colloidal dissolved substances is a basic dye and the dye is precipitated by the solution of zirconium salt after oxidation with hypochlorite.
Claim 25
Dependent Claim
17 words
The method according to claim 1 in which one of the non-colloidal dissolved substances is a phosphate.
Claim 26
Dependent Claim
17 words
The method according to claim 1 in which one of the non-colloidal dissolved substances is arsenic acid.
Claim 27
Dependent Claim
25 words
The method according to claim 1 in which the waste water is sewage from mines and one of the non-colloidal dissolved substances is arsenious acid.
Claim 28
Dependent Claim
99 words
The method according to claim 1 in which the sewage contains food sewage which includes residual organic substances and the waste water is treated once with said solution of ZrOCl 2 .8H 2 O to coagulate and precipitate suspended substances and colloidal dispersed particles, and to precipitate non-colloidal dissolved, low molecular weight organic substances by forming insoluble precipitates or chelates and the precipitates are removed by filtration and the residual organic substances contained in the filtrate are treated again with a solution of ZrOCl 2 .8H 2 O after oxidation by chlorine under irradiation with ultraviolet light or sunlight.
Claim 29
Dependent Claim
61 words
The method according to claim 1 wherein one of the non-colloidal dissolved substances is a basic dye and after treatment with said solution of said zirconium salt and removal of the precipitate or chelate, the filtrate is oxidized with chlorine under irradiation with ultraviolet light or direct sunlight, then treated with a solution of a zirconium salt and the precipitate removed.
Claim 30
Dependent Claim
29 words
A method according to claim 1 wherein dissolved phosphates are removed from said waste water and the large scale growth of red colored plankton in sea water is prevented.
Claim 31
Independent Claim
115 words
A method of purification of waste water which includes industrial waste water from metal working, chemical sewage, electroplating, food, chemical pulping, paper making and living sewage, which comprises adding to said waste water calcium hydroxide to coagulate and precipitate suspended particles and colloidal dispersed particles, removing the precipitate, passing carbon dioxide through the filtrate to precipitate the remaining calcium ions in the filtrate as calcium carbonate, removing the calcium carbonate, oxidizing with chlorine under irradiation with ultraviolet light the non-colloidal dissolved organic substances, adding an aqueous solution of ZrOCl 2 .8H 2 O to the filtrate, mixing and adjusting the pH to 4.5-6.8, whereby coagulation and precipitation of suspended substances and colloidal dispersed particles occurs.
Claim 32
Independent Claim
115 words
A method of purification of waste water which includes industrial waste water from metal working, chemical sewage, electroplating, food, chemical pulping, paper making and living sewage, which comprises adding to said waste water calcium hydroxide to coagulate and precipitate suspended particles and colloidal dispersed particles, removing the precipitate, passing carbon dioxide through the filtrate to precipitate the remaining calcium ions in the filtrate as calcium carbonate, removing the calcium carbonate, oxidizing with chlorine under irradiation with ultraviolet light the non-colloidal dissolved organic substances, adding an aqueous solution of ZrOCl 2 .8H 2 O to the filtrate, mixing and adjusting the pH to 4.5-6.8, whereby coagulation and precipitation of suspended substances and colloidal dispersed particles occurs.
Claim 33
Dependent Claim
62 words
A method of purification of waste water according to claim 30 wherein the waste water is from aluminum polishing mills comprising coagulating and precipitating suspended substances and colloidal dispersed particles, and precipitating non-colloidal dissolved, low molecular weight substances by adding an aqueous solution of ZrOCl 2 .8H 2 O to the said waste water to form water insoluble precipitates or chelates thereof.
Claim 34
Dependent Claim
60 words
A method of purification of waste water according to claim 30 wherein the waste water is from electro-plating comprising coagulating and precipitating suspended substances and colloidal dispersed particles, and precipitating non-colloidal dissolved, low molecular weight substances by adding an aqueous solution of ZrOCl 2 .8H 2 O to the said waste water to form water insoluble precipitates or chelates thereof.
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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) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |