US4219418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water treatment process
Assignee: Individual
•
Filing: 1978-06-21
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Granted: 1980-08-26
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Expires: 1998-06-21
Abstract
Abstract The present invention is concerned with a process for the purification of highly polluted water containing paper mill waste products and algae, which comprises: (a) treating said highly polluted water with hydrogen peroxide and alum; (b) allowing flocculation and then sedimentation to take place, while pre-chlorinating the treated water by subjecting it to the action of chlorine during flocculation or after sedimentation, or both; (c) filtrating the resulting water to remove therefrom solid particles still in suspension; and (d) post-chlorinating the filtrated water by treating it with a liquid composition obtained by mixing chlorine, an alkali metal chlorate and a non-toxic mineral acid. The water treatment process according to the invention enables one to obtain a drinking water which is colorless, odorless and from which bad tastes have been eliminated.
Inventors
- 👤 Jacques Pilon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:46
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F2103/00; C02F2103/26; C02F2103/28; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/909; Y10S210/928
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
154 words
A process for the production of odorless and colorless drinking water from polluted water containing papermill waste products and algae, which comprises: (a) treating said highly polluted water with hydrogen peroxide in an amount of from 1 to 10 p.p.m. calculated by weight with respect to the quantity of water being treated and alum; (b) allowing flocculation and then sedimentation to take place, while pre-chlorinating the treated water by subjecting it to the action of chlorine; (c) filtrating the resulting water to remove therefrom solid particles still in suspension; and, (d) post-chlorinating the filtrated water by treating it with a liquid composition resulting from the mixture of 1.0 p.p.m. of chlorine, 0.5 to 1.0 p.p.m. of an alkali metal chlorate, 0.5 to 1.6 p.p.m. of a non-toxic mineral acid, and 0.5 to 1.0 p.p.m. of hydrogen peroxide, the amount of each being calculated by weight with respect to the quantity of water being treated.
Claim 2
Dependent Claim
154 words
A process for the production of odorless and colorless drinking water from polluted water containing papermill waste products and algae, which comprises: (a) treating said highly polluted water with hydrogen peroxide in an amount of from 1 to 10 p.p.m. calculated by weight with respect to the quantity of water being treated and alum; (b) allowing flocculation and then sedimentation to take place, while pre-chlorinating the treated water by subjecting it to the action of chlorine; (c) filtrating the resulting water to remove therefrom solid particles still in suspension; and, (d) post-chlorinating the filtrated water by treating it with a liquid composition resulting from the mixture of 1.0 p.p.m. of chlorine, 0.5 to 1.0 p.p.m. of an alkali metal chlorate, 0.5 to 1.6 p.p.m. of a non-toxic mineral acid, and 0.5 to 1.0 p.p.m. of hydrogen peroxide, the amount of each being calculated by weight with respect to the quantity of water being treated.
Claim 3
Dependent Claim
21 words
Process according to claim 1, wherein said alkali metal chlorate is sodium chlorate and said non-toxic mineral acid is sulfuric acid.
Claim 4
Dependent Claim
57 words
Process according to claim 2, wherein said liquid composition is obtained starting from a mixture of a 2.5 to 5% by volume aqueous solution of sulfuric acid, a 3% by weight aqueous solution of sodium chlorate and a 2.5% by volume aqueous solution of hydrogen peroxide, in which chlorine has been injected at a controlled flow rate.
Claim 5
Dependent Claim
57 words
Process according to claim 1, wherein said filtrated water is treated with a liquid composition resulting from the mixture of 1.0 p.p.m. of chlorine, 1.0 p.p.m. of sodium chlorate, 1.6 p.p.m. of sulfuric acid and 0.8 p.p.m. of hydrogen peroxide, the amount of each being calculated by weight with respect to the quantity of water being treated.
Claim 6
Dependent Claim
57 words
Process according to claim 1, wherein said filtrated water is treated with a liquid composition resulting from the mixture of 1.0 p.p.m. of chlorine, 1.0 p.p.m. of sodium chlorate, 1.0 p.p.m. of sulfuric acid and 1.0 p.p.m. of hydrogen peroxide, the amount of each being calculated by weight with respect to the quantity of water being treated.
Claim 7
Dependent Claim
57 words
Process according to claim 1, wherein said filtrated water is treated with a liquid composition resulting from the mixture of 1.0 p.p.m. of chlorine, 0.5 p.p.m. of sodium chlorate, 0.5 p.p.m. of sulfuric acid and 0.5 p.p.m. of hydrogen peroxide, the amount of each being calculated by weight with respect to the quantity of water being treated.
Claim 8
Dependent Claim
25 words
Process according to claim 1, wherein said amount of hydrogen peroxide used to treat said highly polluted water is comprised between 2.5 and 7.5 p.p.m.
Claim 9
Dependent Claim
21 words
Process according to claim 7, wherein said amount of hydrogen peroxide used to treat said highly polluted water is 5.0 p.p.m.
Claim 10
Dependent Claim
24 words
Process according to claim 1, wherein said highly polluted water is subjected to the hydrogen peroxide action for a period of approximately 30 minutes.
Claim 11
Dependent Claim
35 words
Process according to claim 1, wherein said highly polluted water is treated with alum in an amount of from 22 to 30 p.p.m. calculated by weight with respect to the quantity of water being treated.
Claim 12
Dependent Claim
17 words
Process according to claim 10, wherein said amount of alum is comprised between 28 and 30 p.p.m.
Claim 13
Dependent Claim
23 words
Process according to claim 1, wherein said highly polluted water is treated with hydrogen peroxide and alum in the presence of a base.
Claim 14
Dependent Claim
13 words
Process according to claim 12, wherein said base is caustic soda or lime.
Claim 15
Dependent Claim
23 words
Process according to claim 12, wherein said base is added in an amount such as to maintain a coagulation pH of approximately 6.1.
Claim 16
Dependent Claim
11 words
Process according to claim 1, wherein pre-chlorination is effected during flocculation.
Claim 17
Dependent Claim
37 words
Process according to claim 15, wherein said treated water is subjected to the action of chlorine in an amount of from 1 to 5 p.p.m. calculated by weight with respect to the quantity of water being treated.
Claim 18
Dependent Claim
14 words
Process according to claim 1, wherein pre-chlorination is effected during flocculation and after sedimentation.
Claim 19
Dependent Claim
61 words
Process according to claim 17, wherein said treated water is subjected to the action of chlorine first during flocculation where chlorine is used in an amount of from 1 to 5 p.p.m., and then after sedimentation where chlorine is used in an amount of 1.0 p.p.m., said amounts being calculated by weight with respect to the quantity of water being treated.
Claim 20
Dependent Claim
31 words
Process according to claim 1, wherein after sedimentation a base is added in an amount such as to reestablish the pH of the water to an equilibrium value of approximately 8.3.
Claim 21
Dependent Claim
15 words
Process according to claim 19, wherein said addition of base is effected prior to filtration.
Claim 22
Dependent Claim
11 words
Process according to claim 1, wherein pre-chlorination is effected after sedimentation.
Claim 23
Dependent Claim
18 words
Process according to claim 1, wherein the water containing paper mill waste products include phenolic or cyclic compound.
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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) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |