US4559142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split feed for the anaerobic biological purification of wastewater
Assignee: Linde GmbH
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Filing: 1984-02-10
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Granted: 1985-12-17
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Expires: 2004-02-10
Abstract
Abstract In the anaerobic biological purification of wastewater containing organic substances, some of which have a low rate of metabolism in anaerobic microorganisms, e.g., undissolved and/or partly macromolecular substances, the low-rate substances are separated from the wastewater into a secondary stream, e.g., by mechanical, adsorptive or precipitating means, before introducing the mainstream of the wastewater to be purified into the reactor operated under anaerobic conditions. The low-rate substances separated in concentrated form are treated, e.g., in a separate anaerobic reactor, or in an aerobic reactor situated downstream of the anaerobic reactor.
Inventors
- 👤 Manfred Morper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:29
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/30; C02F3/28; Y; Y10; Y10S; Y10S435/00; Y10S435/801
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
133 words
In a process for the anaerobic biological purification of wastewater containing organic substances, a portion of the latter being metabolizable anaerobically at a low rate and being partially undissolved and partially macromolecular, the improvement comprising, prior to introducing the mainstream of the wastewater to be purified into a reactor operated under anaerobic conditions, separating at least a fraction of the low-rate metabolizable substances from the wastewater into a secondary stream; anaerobically treating said low-rate metabolizable substances independently of the remaining substances in the mainstream of the wastewater to be purified, said anaerobic treating consisting essentially of enzymatic conversion of undissolved substances into dissolved substances and hydrolysis of macromolecular weight substances into lower molecular weight substances; and introducing resultant anaerobically treated low-rate metabolizable substances into the anaerobically operated reactor located in the main stream.
Claim 2
Dependent Claim
133 words
In a process for the anaerobic biological purification of wastewater containing organic substances, a portion of the latter being metabolizable anaerobically at a low rate and being partially undissolved and partially macromolecular, the improvement comprising, prior to introducing the mainstream of the wastewater to be purified into a reactor operated under anaerobic conditions, separating at least a fraction of the low-rate metabolizable substances from the wastewater into a secondary stream; anaerobically treating said low-rate metabolizable substances independently of the remaining substances in the mainstream of the wastewater to be purified, said anaerobic treating consisting essentially of enzymatic conversion of undissolved substances into dissolved substances and hydrolysis of macromolecular weight substances into lower molecular weight substances; and introducing resultant anaerobically treated low-rate metabolizable substances into the anaerobically operated reactor located in the main stream.
Claim 3
Dependent Claim
22 words
A process according to claim 1, wherein the low-rate metabolizable substances separated in the secondary stream prior to said treating are concentrated.
Claim 4
Dependent Claim
19 words
A process according to claim 1, wherein the separation of the low-rate metabolizable substances comprises the addition of precipitants.
Claim 5
Dependent Claim
17 words
A process according to claim 3, said separation further comprising mechanically separating resultant precipitated low-rate metabolizable substances.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein the separation of the low-rate metabolizable substances comprises the addition of flocculants.
Claim 7
Dependent Claim
17 words
A process according to claim 5, said separation further comprising mechanically separating resultant flocculated low-rate metabolizable substances.
Claim 8
Dependent Claim
19 words
A process according to claim 1, wherein the separation of the low-rate metabolizable substances comprises the addition of adsorbents.
Claim 9
Dependent Claim
17 words
A process according to claim 7, said separation further comprising mechanically separating resultant adsorbed low-rate metabolizable substances.
Claim 10
Dependent Claim
23 words
A process according to claim 1, wherein the separation of the low-rate metabolizable substances comprises mechanically separating low rate substances from the mainstream.
References Cited (Backward Citations)
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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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |