US4544381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removal of emission gas pollutants by biological means
Assignee: Bayer AG
•
Filing: 1984-07-13
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Granted: 1985-10-01
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Expires: 2004-07-13
Abstract
Abstract Method for scrubbing gases containing oxygen, that are polluted by biodegradable substances, by bringing them into contact with an aqueous suspension of microorganisms such that: (a) the period of contact between gas and suspension is 0.5-5 seconds; (b) the suspension is brought into contact with the gas again after a retention time of 3-10 minutes has been attained; (c) the suspension is continuously supplied with active biomass in amounts between 0.5% and 5% of the aqueous suspension whereby (d) the excess suspension is drawn off.
Inventors
- 👤 Friedrich Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:17
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/025; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/84; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/916
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
Method for scrubbing gases containing oxygen, that are polluted by biodegradable substances, by bringing them into contact with an aqueous suspension of microorganisms such that: (a) the period of contact between gas and suspension is 0.5-5 seconds; (b) the suspension is brought into contact with the gas again after a retention time of 3-10 minutes has been attained; (c) the suspension is continuously supplied with active biomass in amounts between 0.5% and 5% of the aqueous suspension whereby (d) the excess suspension is drawn off.
Claim 2
Dependent Claim
85 words
Method for scrubbing gases containing oxygen, that are polluted by biodegradable substances, by bringing them into contact with an aqueous suspension of microorganisms such that: (a) the period of contact between gas and suspension is 0.5-5 seconds; (b) the suspension is brought into contact with the gas again after a retention time of 3-10 minutes has been attained; (c) the suspension is continuously supplied with active biomass in amounts between 0.5% and 5% of the aqueous suspension whereby (d) the excess suspension is drawn off.
Claim 3
Dependent Claim
27 words
Method according to claim 1, whereby the concentration of biomass in the aqueous suspension is 0.2-1 g dry weight/liter and preferably 0.5-8 g dry weight per liter.
Claim 4
Dependent Claim
18 words
Method according to claim 1 whereby the inflowing active biomass has a concentration of 0.5-2 g dry weight/liter.
Claim 5
Dependent Claim
29 words
Method according to one of the claim 1 whereby the inflowing biomass is cultured in a fermenter with noxious substance concentrations reflecting the content of substances in the gas.
Claim 6
Dependent Claim
26 words
Method according to one of the claim 1 whereby a jet washer or a Venturi washer is used to bring about contact between gas and suspension.
Claim 7
Dependent Claim
44 words
Method according to one of the claim 1 whereby a complete remixing of the suspension is avoided by means of a two or more stage process of suspension retention during the retention period before the suspension is brought into contact with the gas again.
Claim 8
Dependent Claim
30 words
Method according to one of the claim 1 whereby the emission gas is subjected to a second phase of biological scrubbing after it has been in contact with the suspension.
Claim 9
Dependent Claim
21 words
Method according to claim 7 whereby the second biological scrubbing is carried out in a trickle filter containing granulated activated charcoal.
References Cited (Backward Citations)
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US3376219A
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US3828525A
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US4225381A
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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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |