Patent US4613434A successfully refreshed from Google Patents.
US4613434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for treatment of wastewater by means of anaerobic fermentation
Assignee: Tampella Oy AB
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Filing: 1983-01-18
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Granted: 1986-09-23
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Expires: 2003-01-18
Abstract
Abstract The invention relates to a device for treatment of wastewater by means of an anaerobic fermentation, which comprises a closed tank 1 and therein elements 2, 10 for feeding wastewater to be treated into the tank, elements 5, 6 3 for removing treated water, gas and sludge from the tank, elements 4 for mixing the contents of the tank and elements 7 for separating gas in the upper part of the tank. Deviating from the traditional completely mixed reactors the tank has been devided into two, on each other placed parts by means of the filters, which tank comprises a filter media bed containing at least one filter media which acts as an attachment bed for methane bacteria and on it a sludge and fluidized material bed, whereat the mixing elements 4 are below the filter and the feed elements 2, 10 for wastewater to be treated are fed below the filter 8 and the elements 5, 6 for removing treated water and gas are located in the tank part above the filter 8. In this way the cheap and simple device has been accomplished for treatment of wastewater, in which it has essentially been shown how acid and methane bacteria are mixed with each other.
Inventors
- 👤 Raimo Maatta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:50
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/28; C02F3/2806; C02F3/02; C02F3/10; Y; Y02; Y02E; Y02E50/00; Y02E50/30; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
213 words
A device for treatment of wastewater by anaerobic fermentation which comprises: a closed tank, a filter dividing said tank into upper and lower compartments, said upper compartment being useful in the treatment of wastewater with methane producing bacteria and said lower compartment being useful in the treatment of wastewater with acid producing bacteria, said filter including a bed of a particulate filter media action as an attachment means for said methane producing bacteria and preventing said methane producing bacteria from being completely removed from said tank with said treated wastewater, said filter further including a fluidized bed overlying said bed of said particulate filter media, said fluidized bed including sludge and a fluidizing agent, means for feeding wastewater to be treated into said lower compartment below said filter, means for removing treated wastewater, gas and sludge from said upper compartment, means for mixing wastewater in said lower compartment, and means for separating gas in said upper compartment; wherein said upper and lower compartments and said filter are associated such that wastewater fed into said lower compartment is treated with said acid producing bacteria, passed through said filter, and treated with said methane producing bacteria, and wastewater passing from said lower compartment into said upper compartment is incapable of recirculation to said lower compartment.
Claim 2
Independent Claim
213 words
A device for treatment of wastewater by anaerobic fermentation which comprises: a closed tank, a filter dividing said tank into upper and lower compartments, said upper compartment being useful in the treatment of wastewater with methane producing bacteria and said lower compartment being useful in the treatment of wastewater with acid producing bacteria, said filter including a bed of a particulate filter media action as an attachment means for said methane producing bacteria and preventing said methane producing bacteria from being completely removed from said tank with said treated wastewater, said filter further including a fluidized bed overlying said bed of said particulate filter media, said fluidized bed including sludge and a fluidizing agent, means for feeding wastewater to be treated into said lower compartment below said filter, means for removing treated wastewater, gas and sludge from said upper compartment, means for mixing wastewater in said lower compartment, and means for separating gas in said upper compartment; wherein said upper and lower compartments and said filter are associated such that wastewater fed into said lower compartment is treated with said acid producing bacteria, passed through said filter, and treated with said methane producing bacteria, and wastewater passing from said lower compartment into said upper compartment is incapable of recirculation to said lower compartment.
Claim 3
Dependent Claim
52 words
The device of claim 1 further comprising a lamella separator below said filter in said lower compartment, said lamella separator distributing water upwardly and evenly through said filter facilitating the growth of the bubbles in said wastewater, and separating portions of sludge in said wastewater and returning them to said lower compartment.
Claim 4
Dependent Claim
76 words
The device according to claim 1 wherein said means for feeding wastewater to be treated into said lower compartment comprises a vertically oriented cylinder open at its opposite ends extending from said lower compartment through said filter and into said upper compartment to a point above said means for separating gas in said upper compartment, and said means for feeding wastewater to be treated into said lower compartment communicating with the upper portion of said cylinder.
Claim 5
Dependent Claim
19 words
The device according to claim 3 further comprising a mixing means provided in the upper portion of said cylinder.
Claim 6
Dependent Claim
27 words
The device of claim 4 further comprising a means for removing wastewater from said lower compartment and recirculating said wastewater to said upper portion of said cylinder.
Claim 7
Dependent Claim
13 words
The device according to claim 1 wherein said particulate filter media comprises gravel.
Claim 8
Dependent Claim
13 words
The device according to claim 1 wherein said particulate filter media comprises slag.
Claim 9
Dependent Claim
18 words
The device according to claim 1 wherein said particulate filter media and said fluidizing agent are the same.
Claim 10
Dependent Claim
18 words
The device according to claim 8 wherein said particulate filter media and said fluidizing agent are activated carbon.
References Cited (Backward Citations)
US2202772A
Cited
US2538412A
Cited
US2881137A
Cited
US2889929A
Cited
US3293174A
Cited
US4076615A
Cited
US4022665A
Cited
US4076616A
Cited
JPS5363765A
Cited
JPS5454453A
Cited
JPS54115550A
Cited
US4294694A
Cited
US4188289A
Cited
US4336135A
Cited
DE2841011A1
Cited
US4253947A
Cited
GB2054549A
Cited
US4284508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |