US3627679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Effluent treatment processes
Assignee: Gulf States Paper Corp
•
Filing: 1967-05-25
•
Granted: 1971-12-14
•
Expires: 1987-05-25
Abstract
Abstract A waste effluent treatment which involves contacting a waste effluent, e.g. pulp and paper mill effluent, with a metal salt reagent, preferably alum mud. Treatment decolorizes the effluent and precipitates a substantial portion of the organic content. The precipitate and sludge is dewatered, then calcined, and the reagent regenerated from the ash for use again in a cyclic process.
Inventors
- 👤 Robert R Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:10
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; B; B01; B01D; B01D21/00; B01D21/0012; B01D21/01; B01D21/02; B01D21/24; B01D21/2427; B01D37/00; Y; Y10; Y10S; Y10S210/00; Y10S210/928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
The process of claim 1, wherein said metal salt is a salt of a metal selected from the group consisting of aluminum, iron and zinc.
Claim 2
Dependent Claim
28 words
The process of claim 1, wherein said metal salt and solids reagent is alum mud and the ash is treated with sulfuric acid to reconstitute the alum mud.
Claim 3
Dependent Claim
86 words
An effluent treatment procedure which comprises contacting paper and pulp mill waste effluent containing sugars, lignin compounds, cellulose fibers, cooking chemicals and the like, with an aqueous reagent consisting of a mixture of solids and a solution of a metal salt, thereafter clarifying the mixture, separating the effluent and the solids sludge and precipitate, dewatering the separated solids, calcining same to an ash, then treating the ash to reconstitute the metal salt solution and solids reagent, and recycling the reagent for employment on incoming waste effluent.
Claim 4
Dependent Claim
29 words
The process of claim 4 wherein said metal salt and solids reagent is an alum mud and the ash is treated with sulfuric acid to reconstitute the alum mud.
Claim 5
Dependent Claim
104 words
The process of decolorizing the waste effluent from paper and pulp mills which comprises treating the waste effluent with an aqueous suspension of alum mud, said alum mud further comprising a suspension of finely divided spent ore from which the alum has been extracted and alum in solution, thereafter clarifying the resulting mixture, and separately withdrawing clarified decolorized effluent and solids sludge and precipitate, dewatering the withdrawn solids sludge and precipitate and recycling the recovered water back to the treatment, calcining the dewatered solids to an ash and reacting the ash with sulfuric acid to reconstitute the alum mud for recycle to the treatment.
Claim 6
Dependent Claim
14 words
The process of claim 6, wherein the waste effluent is pretreated with sodium aluminate.
Claim 7
Dependent Claim
15 words
The Process of claim 6, wherein a sulfate is produced by reaction with sulfuric acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |