Patent US4940544A successfully refreshed from Google Patents.
US4940544A
Expired / Lapsed
US
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Decentral wastewater treatment process
Assignee: Henkel AG and Co KGaA
•
Filing: 1988-07-14
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Granted: 1990-07-10
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Expires: 2008-07-14
Abstract
Abstract A process for the treatment of wastewaters heavily polluted by fats, proteins and/or carbohydrates of vegetable or animal origin or their processing products by degradation by microorganisms in a continuous flow reactor without separation of fats and/or sludges, comprising passing the wastewasters through a first part of a reactor containing aerobic and anaerobic microorganisms to consume the free oxygen present in the water, with at least partial degradation of the pollutants to fermentation products, and on flowing through another, adjoining part of the reactor, the fermentation products and any pollutants still present are coverted in the presence of the anaerobic microorganisms into--predominantly--digester gas and biomass. Optionally, fertilizing and/or pH-stabilizing substances or other auxiliaries are added in order to reduce the susceptibility of the system to failure.
Inventors
- 👤 Peter Gode
- 👤 Jens P. Riebe
- 👤 Lutz Jeromin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:10
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/34; C02F3/343; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0208; B01D17/04; C02F3/28; C02F3/2806; C02F3/30; Y; Y02; Y02E; Y02E50/00; Y02E50/30
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
190 words
A process for the continuous flow decentral treatment of wastewaters polluted with one or more fats, proteins, or carbohydrates comprising the steps of A. containing the polluted wastewater in a region containing at least one flow-protected zone, which is a packed or sponge filled blind end tube which acts as a microorganism reservoir, with both aerobic and anaerobic microorganisms for a time sufficient to at least partially degrade the pollutants in the wastewater to fermentation products; B. contacting the wastewater containing the fermentation products in a region containing at least one flow-protected zone, which is a packed or sponge filled blind end tube which acts as a microorganism reservoir, with anaerobic microorganisms for a time sufficient to convert most of the fermentation products and any remaining pollutants into digester gas and biomass; and C. separating the digester gas and biomass from the wastewater; wherein when conditions are such in the operation of the process that microorganisms in step A or B or both are destroyed in the non-flow-protected zones of said regions, repopulating the wastewater in step A or B or both the microorganisms present in the blind end tubes.
Claim 2
Dependent Claim
190 words
A process for the continuous flow decentral treatment of wastewaters polluted with one or more fats, proteins, or carbohydrates comprising the steps of A. containing the polluted wastewater in a region containing at least one flow-protected zone, which is a packed or sponge filled blind end tube which acts as a microorganism reservoir, with both aerobic and anaerobic microorganisms for a time sufficient to at least partially degrade the pollutants in the wastewater to fermentation products; B. contacting the wastewater containing the fermentation products in a region containing at least one flow-protected zone, which is a packed or sponge filled blind end tube which acts as a microorganism reservoir, with anaerobic microorganisms for a time sufficient to convert most of the fermentation products and any remaining pollutants into digester gas and biomass; and C. separating the digester gas and biomass from the wastewater; wherein when conditions are such in the operation of the process that microorganisms in step A or B or both are destroyed in the non-flow-protected zones of said regions, repopulating the wastewater in step A or B or both the microorganisms present in the blind end tubes.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the residence time in step A is not less than 3 minutes.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the residence time in step B is not less than 3 minutes.
Claim 5
Dependent Claim
28 words
The process of claim 1 wherein the residence time in each of steps A and B is in the range of from about 0.5 to about 8 days.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein the residence times in steps A and B are from about 1 to about 4 days.
Claim 7
Dependent Claim
29 words
The process of claim 1 wherein the anaerobic microorganisms used in steps A and B are mixed cultures obtained from the anaerobic part of a community sewage treatment plant.
Claim 8
Dependent Claim
28 words
The process of claim 1 wherein the anaerobic microorganisms used in steps A and B are obtained from an anaerobic digested sludge, a water sediment, or animal feces.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein both step A and step B are carried out in a fat separator or a sludge separator.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein a portion of the wastewater from step B is returned to step A.
Claim 11
Dependent Claim
20 words
The process of claim 1 wherein a fertilizing material is added to step A to provide nutrients for the microorganisms.
Claim 12
Dependent Claim
15 words
The process of claim 1 wherein a pH stabilizing material is added in step A.
Claim 13
Dependent Claim
30 words
The process of claim 11 wherein the pH stabilizing material is added in a quantity sufficient to produce a pH of from about 7 to about 10 in step A.
Claim 14
Dependent Claim
15 words
The process of claim 12 wherein the pH stabilizing material is a biologically compatible buffer.
Claim 15
Dependent Claim
40 words
The process of claim 1 wherein in step A one or more trace elements selected from the group consisting of N, P, S, K, Ca, Mg, and Fe in the form of compounds containing them are introduced into step A.
Claim 16
Dependent Claim
16 words
The process of claim 1 wherein in step A a fat dispersing emulsifier is introduced therein.
Claim 17
Dependent Claim
19 words
The process of claim 15 wherein the fat dispersing emulsifier is an anionic surfactant, a nonionic surfactant, or both.
Claim 18
Dependent Claim
31 words
The process of claim 16 wherein the surfactant is one or more of a fatty acid alkyl ester sulfonate, an alkane sulfonate, an alkyl benzene sulfonate, or an alkyl phenol ethyloxylate.
Claim 19
Dependent Claim
42 words
The process of claim 1 wherein the residence time in each of steps A and B is in the range of from about 0.5 to about 8 days, and a fertilizing material and a pH stabilizing material are added in step A.
Claim 20
Dependent Claim
19 words
The process of claim 18 wherein the process is carried out in a fat separator or a sludge separator.
Claim 21
Dependent Claim
16 words
The process of claim 19 wherein in step A a fat dispersing emulsifier is introduced therein.
Claim 22
Dependent Claim
19 words
The process of claim 18 wherein a portion of the wastewater from step B is returned to step A.
Claim 23
Dependent Claim
38 words
The process of claim 1 wherein the repopulating of the wastewater is carried out by maintaining the wastewater in the non-flow-protected zones in contact with microorganisms in the blind end tubes until repopulation of the wastewater has occurred.
References Cited (Backward Citations)
NL290126A
Cited
DE225983C
Cited
US1331735A
Cited
US1690682A
Cited
US1602306A
Cited
US1838474A
Cited
US2029702A
Cited
US2064529A
Cited
GB1152703A
Cited
LU60783A1
Cited
DE2207633A1
Cited
US4029575A
Cited
FR2235089A1
Cited
US3878303A
Cited
BE866935A
Cited
US4246099A
Cited
US4328104A
Cited
DE2939169A1
Cited
US4311593A
Cited
EP0048675A1
Cited
WO1983001206A1
Cited
US4510243A
Cited
US4650590A
Cited
US4491522A
Cited
EP0121851B1
Cited
DE3419139A1
Cited
JPS6150680A
Cited
DE3537310A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-09 | 1994-01-08 | 1994-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-09 | 1998-01-08 | 1998-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-09 | 2002-01-08 | 2002-07-10 | $7700.00 | Window Closed / Lapsed |