US4662900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for biological treatment of waste gases
Assignee: FIFTH ELEMENT NV
•
Filing: 1985-09-03
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Granted: 1987-05-05
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Expires: 2005-09-03
Abstract
Abstract Method for removal of malodorous and/or toxic components from waste gases by biological treatment of the same. Such removal is accomplished by passing the gas stream through a humidifying temperature conditioning section and then through a filter bed. The filter bed consists of a mixture of an organic biological active material, like compost, an inert fraction and additives for neutralization and organic buffening. Also disclosed is the inoculation of the filter bed with specific micro-organisms adapted to remove constituents of the gas stream which are difficultly biodegradable, e.g. methylenechloride.
Inventors
- 👤 Simon P. P. Ottengraf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:40
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/84; C; C02; C02F; C02F3/00; C02F3/02; C02F3/025; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/916
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
121 words
Method of biologically filtering gases containing pollutants, in particular industrial waste gases by a fixed bed type filter material containing a carrier material which has been provided with appropriate micro-organisms which are stationary on the surface of the carrier material, characterized in that the gases are initially water saturated prior to their entrance into the filter material by bringing the gases into intimate contact with water in such manner that the gases contain the quantity of water required for the micro-organisms, to optimally function, the water saturated gases are then directed into the filter material and passed through it, whereby the pollutants in the water saturated gas come in direct contact with the micro-organism on the surface of the carrier material.
Claim 2
Dependent Claim
121 words
Method of biologically filtering gases containing pollutants, in particular industrial waste gases by a fixed bed type filter material containing a carrier material which has been provided with appropriate micro-organisms which are stationary on the surface of the carrier material, characterized in that the gases are initially water saturated prior to their entrance into the filter material by bringing the gases into intimate contact with water in such manner that the gases contain the quantity of water required for the micro-organisms, to optimally function, the water saturated gases are then directed into the filter material and passed through it, whereby the pollutants in the water saturated gas come in direct contact with the micro-organism on the surface of the carrier material.
Claim 3
Dependent Claim
15 words
Method of claim 1, characterized in that additional materials are added to the carrier material.
Claim 4
Dependent Claim
22 words
Method of claim 1 characterized in that the water is sprayed for the gases being brought into intimate contact with the water.
Claim 5
Dependent Claim
19 words
Method of claim 1, characterized in that the weight ratio of spraywater to gas is from 1:10 to 10:1.
Claim 6
Dependent Claim
44 words
Method of claim 1, characterized in that the gases are brought to the temperature required for the microorganisms to optimally function, the temperature of the water is selected so that the temperature of the gases to be treated is between 10° and 40° C.
Claim 7
Dependent Claim
19 words
Method of claim 1-5, characterized in that the relative humidity of the gases after pretreatment with water is 95-100%.
Claim 8
Dependent Claim
26 words
Method of claims 1, characterized in that in the water a specific microbiological population is introduced for decomposing part of the substances dissolved in the water.
Claim 9
Dependent Claim
39 words
Method of claim 1, characterized in that any water soluble substances present in gases dissolve at least partially, the water soluble substances present in the gases after dissolving in the water are removed from the gases to be filtered.
Claim 10
Dependent Claim
32 words
Method of claim 2, characterized in that additional materials are added, which counteract the development of shrink cracks in the carrier material and which reduce the flow resistance of the biological filter.
Claim 11
Dependent Claim
39 words
Method of claim 9, characterized in that said additional material is selected from polyethylene particles, polystyrene particles, particles of ground automoblile tyres, fixed clay particles, ground lava bits, coals cinder particles, pelletized flue dust, perlite pellets, and active carbon.
Claim 12
Dependent Claim
21 words
Method of claim 9, characterized in that the particles of the additional material have a diameter of 3 to 10 mm.
Claim 13
Dependent Claim
30 words
Method of claim 9, characterized in that the additional material is intimately mixed with the carrier material in a proportion lying between 30-70% and 70-30% on the basis of volume.
Claim 14
Dependent Claim
27 words
Method of claims 9-12, characterized in that micro-organisms are applied to the carrier material, which micro-organisms by nature are not present in and/or on the carrier material.
Claim 15
Dependent Claim
15 words
Method of claim 2, characterized in that as additional material materials counteracting acidification are added.
Claim 16
Dependent Claim
18 words
Method of claim 14, characterized in that said material counteracting acidification is selected from limestones and calcium carbonate.
Claim 17
Dependent Claim
23 words
Method of claim 14, characterized in that the additional material is added in a weight proportion of 2-40% relative to the carrier material.
Claim 18
Dependent Claim
22 words
Method of claim 2, characterized in that as additional material for the substances to be removed a strongly adsorbing material is added.
Claim 19
Dependent Claim
23 words
Method of claim 17, characterized in that said material is active carbon, and is added in a quantity of 1-250 kg/m 3 .
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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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |