US4461708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Procedure for purifying effluent waters, particularly those produced in wood-processing industry
Assignee: Stora Enso Oyj
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Filing: 1982-12-15
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Granted: 1984-07-24
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Expires: 2002-12-15
Abstract
Abstract The present invention concerns a procedure for purifying in a fluidized bed reactor (1) effluent waters, particularly those produced in the wood-processing industry. The reactor contains, in addition to fluidized, finely divided particles (7), also agglomerated fibre material (8) serving the purpose of reducing the quantity of the floating particles required. The fibre material may for instance be cellulose, introduced in the reactor together with the effluent water to be treated and which is converted into agglomerates in the reactor.
Inventors
- 👤 Risto Hakulinen
- 👤 Marja Salkinoja-Salonen
- 👤 Jorma Rasanen
- 👤 Juhani Kyytsonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:09
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/66; B; B01; B01D; B01D24/00; B01D24/36; B01D24/38; B01D24/386; C; C02; C02F; C02F1/00; C02F1/52; C02F1/5281
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
A method for purifying effluent water comprising treating the effluent water in a reactor containing a fluidized bed of finely divided particles and a bed of agglomerated fibrous material which serve as a fixing base for bacteria which decompose the impurities in the water, wherein the bed of agglomerated fibrous material constitutes a separate layer above the fluidized bed.
Claim 2
Independent Claim
59 words
A method for purifying effluent water comprising treating the effluent water in a reactor containing a fluidized bed of finely divided particles and a bed of agglomerated fibrous material which serve as a fixing base for bacteria which decompose the impurities in the water, wherein the bed of agglomerated fibrous material constitutes a separate layer above the fluidized bed.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein the fibrous material is introduced into the reactor together with the effluent water to be purified and is turned into an agglomerate in the reactor.
Claim 4
Dependent Claim
21 words
The method of claim 2 wherein the fibrous material is added to the effluent water to be introduced in the reactor.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein the fibrous material is cellulose.
Claim 6
Dependent Claim
52 words
The method of claim 1 wherein the purification of the effluent water is carried out in a two-step process in that the treatment in the fluidized bed reactor forms the first, anaerobic step of the process, and the second step of the process consists of an aerobic purification treatment in a bio-filter.
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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |