US5057221A
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US
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Aerobic biological dehalogenation reactor
Assignee: Weyerhaeuser Co
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Filing: 1988-12-19
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Granted: 1991-10-15
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Expires: 2008-12-19
Abstract
Abstract Methylotrophic and heterotrophic microorganisms are supported on a rigid substrate bed. Oxygen, such as from air, and a low-molecular-weight alkane, such as methane, flow through the bed. Organic compounds in contaminated water processing through the bed are biodegraded by the microorganisms. The bed may be formed of manufactured particlate material, such as of activated carbon. These bed-forming materials may be preloaded with organic carbon materials to provide a nutrient source for the microogranisms. The biological reactor may continuously treat effluent from, for example, an industrial plant, in either a batch or continuous process. A water solids removal subsystem may be positioned upstream of the biological reactor to remove organic carbon compounds and various solids from the contaminated water prior to treatment. Optional bed cleaning mechanisms may also be included in the biological reactor. A methane gas source for the biological reactor may comprise a methanogenic microorganism-containing second reactor which uses liquid from the first biological reactor as a carbon and energy source.
Inventors
- 👤 Curtis W. Bryant
- 👤 William A. Barkley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:55
CPC Classifications
C; C12; C12M; C12M25/00; C12M25/16; C12M25/18; C02; C02F; C02F3/00; C02F3/02; C02F3/06; C02F3/10; C02F3/12; C02F3/1205; C02F3/1231; A; A62; A62D; A62D2101/00; A62D2101/20; A62D2101/22; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
175 words
A method for dehalogenating and further biodegrading organic compounds present in an aqueous liquid mixture to at least partially reduce the concentrations of the organic compounds in the mixture, the method comprising: supporting a mixed population of aerobic microorganisms on a substrate bed configured to allow liquid to flow therethrough with the liquid contacting the microorganisms; passing the aqueous mixture containing halogenated organic compounds through the bed such that the microorganisms in at least a portion of the bed dehalogenate and metabolize the organic compounds in the mixture as the liquid flows through the bed; maintaining a concentration of oxygen substantially throughout at least a portion of the bed which is sufficient to provide aerobic conditions in at least a portion of the bed, as the aqueous mixture flows through the bed; and maintaining a concentration throughout the bed of a carbon and energy source for microorganisms on the bed, whereby the microorganisms dehalogenate and further biodegrade the organic compounds in the aqueous mixture via a co-metabolic process as the liquid flows through the bed.
Claim 2
Independent Claim
175 words
A method for dehalogenating and further biodegrading organic compounds present in an aqueous liquid mixture to at least partially reduce the concentrations of the organic compounds in the mixture, the method comprising: supporting a mixed population of aerobic microorganisms on a substrate bed configured to allow liquid to flow therethrough with the liquid contacting the microorganisms; passing the aqueous mixture containing halogenated organic compounds through the bed such that the microorganisms in at least a portion of the bed dehalogenate and metabolize the organic compounds in the mixture as the liquid flows through the bed; maintaining a concentration of oxygen substantially throughout at least a portion of the bed which is sufficient to provide aerobic conditions in at least a portion of the bed, as the aqueous mixture flows through the bed; and maintaining a concentration throughout the bed of a carbon and energy source for microorganisms on the bed, whereby the microorganisms dehalogenate and further biodegrade the organic compounds in the aqueous mixture via a co-metabolic process as the liquid flows through the bed.
Claim 3
Dependent Claim
43 words
The method of claim 1 wherein the aerobic microorganisms are a mixed population including at least one species of methylotrophic microorganisms, and in which the carbon and energy source is any of the group of saturated alkanes having one to four carbon atoms.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein the low-molecular-weight alkane comprises methane and the microorganisms include methanotrophic microorganisms.
Claim 5
Dependent Claim
20 words
The method of claim 2 wherein the concentration of the low-molecular-weight alkane throughout the bed is at least 0.1 mg/L.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the carbon and energy source comprises methanol.
Claim 7
Independent Claim
118 words
A method for dehalogenating and further biodegrading organic compounds present in an aqueous mixture to at least partially remove the concentrations of the organic compounds in the liquid, the method comprising: supporting a population of methylotrophic microorganisms on a substrate bed comprised substantially of manufactured materials; flowing a carbon and energy source for the microorganisms through the bed; flowing a gas consisting at least partially of oxygen through the bed; passing the aqueous liquid mixture containing halogenated organic compounds through the bed with the carbon and energy source and the gas consisting at least partially of oxygen such that the microorganisms dehalogenate and metabolize the organic compounds in the aqueous mixture as the liquid passes through the bed.
Claim 8
Independent Claim
118 words
A method for dehalogenating and further biodegrading organic compounds present in an aqueous mixture to at least partially remove the concentrations of the organic compounds in the liquid, the method comprising: supporting a population of methylotrophic microorganisms on a substrate bed comprised substantially of manufactured materials; flowing a carbon and energy source for the microorganisms through the bed; flowing a gas consisting at least partially of oxygen through the bed; passing the aqueous liquid mixture containing halogenated organic compounds through the bed with the carbon and energy source and the gas consisting at least partially of oxygen such that the microorganisms dehalogenate and metabolize the organic compounds in the aqueous mixture as the liquid passes through the bed.
Claim 9
Dependent Claim
29 words
The method of claim 6 including the step of decreasing the biochemical oxygen demand of the aqueous liquid mixture prior to passing the aqueous liquid mixture through the bed.
Claim 10
Dependent Claim
25 words
The method of claim 6 including the step of removing solids from the aqueous mixture prior to passing the aqueous liquid mixture through the bed.
Claim 11
Dependent Claim
27 words
The method of claim 6 including the step of maintaining the biochemical oxygen demand of the aqueous mixture passing through the bed at a substantially constant level.
Claim 12
Dependent Claim
25 words
The method of claim 6 wherein the aqueous liquid mixture undergoes a controlled minimum decrease in total organic carbon as it passes through the bed.
Claim 13
Dependent Claim
18 words
The method of claim 6 including the step of continuously passing the aqueous liquid mixture through the bed.
Claim 14
Dependent Claim
18 words
The method of claim 6 wherein the substrate bed is comprised of a solid material in particulate form.
Claim 15
Dependent Claim
18 words
The method of claim 12 wherein the substrate bed is of particles having a large specific surface area.
Claim 16
Dependent Claim
22 words
The method of claim 6 wherein the substrate bed is comprised of a solid material having a capacity to adsorb organic compounds.
Claim 17
Dependent Claim
22 words
The method of claim 14 wherein the substrate bed is preloaded with organic compounds during colonization of the bed with the microorganisms.
Claim 18
Dependent Claim
17 words
The method of claim 6 wherein the substrate bed is comprised substantially of granules of activated carbon.
Claim 19
Dependent Claim
56 words
The method of claim 6 including the preliminary steps of obtaining an inoculum of microorganisms from a native population of such microorganisms occupying a depth zone between an underlying anaerobic benthal layer and an overlying aerobic layer of a pond having such layers, introducing the inoculum into the bed and colonizing the bed with the inoculum.
Claim 20
Dependent Claim
22 words
The method of claim 6 wherein the organic compounds in the aqueous liquid mixture include halogenated and non-halogenated alkanes, alkenes, and aromatics.
Claim 21
Dependent Claim
38 words
The method of claim 6 wherein the organic compounds in the aqueous mixture include pentachlorophenol and wherein there is a substantial decrease in the concentration of pentachlorophenol in the aqueous liquid mixture as it passes through the bed.
Claim 22
Dependent Claim
60 words
The method of claim 6 wherein the organic compounds in the aqueous mixture include dioxin and at least one other organic compound and wherein dehalogenation of such one other organic compound is performed in the presence of the dioxin and there is a decrease in the concentration of dioxin in the aqueous liquid mixture as it passes through the bed.
Claim 23
Dependent Claim
44 words
The method of claim 6 wherein the organic compounds in the aqueous mixture include soluble adsorbable organic halide and wherein there is a substantial decrease in the concentration of soluble adsorbable organic halide in the aqueous liquid mixture as it passes through the bed.
Claim 24
Dependent Claim
42 words
The method of claim 6 wherein the organic compounds in the aqueous mixture include aromatic hydrocarbons and wherein there is a substantial decrease in ultraviolet absorption at 254 nanometers of the aqueous liquid as the aqueous liquid mixture passes through the bed.
Claim 25
Dependent Claim
58 words
The method of claim 6 wherein the organic compounds in the mixture include furan and at least one other organic compound and wherein dehalogenation of such one other organic compound is performed in the presence of furan and there is a decrease in the concentration of furan in the aqueous liquid mixture as it passes through the bed.
References Cited (Backward Citations)
US3979283A
Cited
US4266034A
Cited
CA1148488A
Cited
US4323649A
Cited
EP0025309A1
Cited
US4344848A
Cited
US4455373A
Cited
US4348476A
Cited
US4473643A
Cited
US4401569A
Cited
US4493895A
Cited
US4385121A
Cited
US4452894A
Cited
DE3208977A1
Cited
US4447541A
Cited
US4713340A
Cited
GB2167085A
Cited
US4623464A
Cited
US4664805A
Cited
US4713343A
Cited
US4765901A
Cited
US4904600A
Cited
US4749491A
Cited
DE3715952A1
Cited
EP0322749A2
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |