Patent US3904518A successfully refreshed from Google Patents.
US3904518A
Expired / Lapsed
US
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Waste water treatment process
Assignee: US Filter Zimpro Inc
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Filing: 1971-05-27
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Granted: 1975-09-09
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Expires: 1991-05-27
Abstract
Abstract Waste water is purified by a process which comprises subjecting the waste water to a biological treatment process in the presence of activated carbon or fuller''s earth. A gas containing molecular oxygen is distributed within the liquid mixture during treatment to provide oxidation means. The process efficiently reduces the biochemical oxygen demand, chemical oxygen demand and total organic content of the waste water in an unusually rapid manner, and removes material not normally removed by the biological treatment alone.
Inventors
- 👤 David Glenn Hutton
- 👤 Francis Leonard Robertaccio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:46
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/1226; B; B01; B01D; B01D21/00; B01D21/02; C02F1/00; C02F1/28; C02F1/281; C02F1/283; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
28 words
AN IMPROVEMENT IN THE PROCESS OF CONTINUOUSLY PURIFYING WASTE WATER TO REDUCE THE BOD, COD, AND TOC THEREOF COMPRISING A. CONTACTING IN A TREATMENT ZONE A MIXTURE OF
Claim 2
Dependent Claim
28 words
AN IMPROVEMENT IN THE PROCESS OF CONTINUOUSLY PURIFYING WASTE WATER TO REDUCE THE BOD, COD, AND TOC THEREOF COMPRISING A. CONTACTING IN A TREATMENT ZONE A MIXTURE OF
Claim 3
Dependent Claim
25 words
WASTE WATER WHICH HAS A PH OF BETWEEN ABOUT 4 AND 11 AND WHICH OPTIONALLY HAS BEEN SUBJECTED TO PRIMARY TREATMENT TO REMOVE SOLIDS, AND
Claim 4
Dependent Claim
25 words
WASTE WATER WHICH HAS A PH OF BETWEEN ABOUT 4 AND 11 AND WHICH OPTIONALLY HAS BEEN SUBJECTED TO PRIMARY TREATMENT TO REMOVE SOLIDS, AND
Claim 5
Dependent Claim
122 words
BIOLOGICALLY ACTIVE SOLIDS IN AN AMOUNT SUFFICIENT TO PROVIDE A TOTAL SUSPENDED SOLIDS CONTENT OF THE MIXTURE OF BETWEEN ABOUT 10 AND 50,000 PARTS PER MILLION, B. AERATING THE MIXTURE BY MIXING A GAS CONTAINING MOLECULAR OXYGEN THROUGH THE MIXTURE FOR A PERIOD OF AT LEAST ABOUT 2 HOURS AND C. REMOVING THE MIXTURE FROM THE TREATMENT ZONE AND SEPARATING SOLIDS FROM THE PURIFIED WATER, THE IMPROVEMENT COMPRISING ADDING TO THE MIXTURE IN THE TREATMENT ZONE BETWEEN ABOUT 50 AND 1500 PARTS OF ACTIVATED CARBON PER MILLION PARTS OF FEED WASTE WATER, SAID CARBON HAVING A SURFACE AREA OF AT LEAST 100 SQUARE METERS PER GRAM AND A PARTICLE SIZE SUCH THAT IT WILL PASS THROUGH A 200 MESH PER INCH SIEVE.
Claim 6
Dependent Claim
122 words
BIOLOGICALLY ACTIVE SOLIDS IN AN AMOUNT SUFFICIENT TO PROVIDE A TOTAL SUSPENDED SOLIDS CONTENT OF THE MIXTURE OF BETWEEN ABOUT 10 AND 50,000 PARTS PER MILLION, B. AERATING THE MIXTURE BY MIXING A GAS CONTAINING MOLECULAR OXYGEN THROUGH THE MIXTURE FOR A PERIOD OF AT LEAST ABOUT 2 HOURS AND C. REMOVING THE MIXTURE FROM THE TREATMENT ZONE AND SEPARATING SOLIDS FROM THE PURIFIED WATER, THE IMPROVEMENT COMPRISING ADDING TO THE MIXTURE IN THE TREATMENT ZONE BETWEEN ABOUT 50 AND 1500 PARTS OF ACTIVATED CARBON PER MILLION PARTS OF FEED WASTE WATER, SAID CARBON HAVING A SURFACE AREA OF AT LEAST 100 SQUARE METERS PER GRAM AND A PARTICLE SIZE SUCH THAT IT WILL PASS THROUGH A 200 MESH PER INCH SIEVE.
Claim 7
Dependent Claim
122 words
biologically active solids in an amount sufficient to provide a total suspended solids content of the mixture of between about 10 and 50,000 parts per million, b. aerating the mixture by mixing a gas containing molecular oxygen through the mixture for a period of at least about 2 hours and c. removing the mixture from the treatment zone and separating solids from the purified water; the improVement comprising adding to the mixture in the treatment zone between about 50 and 1500 parts of activated carbon per million parts of feed waste water, said carbon having a surface area of at least 100 square meters per gram and a prticle size such that it will pass through a 200 mesh per inch sieve.
Claim 8
Dependent Claim
122 words
biologically active solids in an amount sufficient to provide a total suspended solids content of the mixture of between about 10 and 50,000 parts per million, b. aerating the mixture by mixing a gas containing molecular oxygen through the mixture for a period of at least about 2 hours and c. removing the mixture from the treatment zone and separating solids from the purified water; the improVement comprising adding to the mixture in the treatment zone between about 50 and 1500 parts of activated carbon per million parts of feed waste water, said carbon having a surface area of at least 100 square meters per gram and a prticle size such that it will pass through a 200 mesh per inch sieve.
Claim 9
Dependent Claim
40 words
The process of claim 1 wherein activated carbon is added at a rate sufficient to supply between about 30 and about 1000 square meters of surface area of carbon for every liter of waste water supplied to the treatment zone.
Claim 10
Dependent Claim
121 words
activated sludge in an amount sufficient to provide a total suspended solids content of the mixture of between about 300 and 50,000 parts per million. b. aerating the mixture by mixing a gas containing molecular oxygen through the mixture for a period of at least about 2 hours, and c. removing the mixture from the treatment zone, and separating solids from the purified water; the improvement comprising adding to the mixture in the treatment zone between about 50 and 1500 parts of activated carbon per million parts of feed waste water, said carbon having a surface area of at least 100 square meters per gram and a particle size such that it will pass through a 200 mesh per inch sieve.
Claim 11
Dependent Claim
121 words
activated sludge in an amount sufficient to provide a total suspended solids content of the mixture of between about 300 and 50,000 parts per million. b. aerating the mixture by mixing a gas containing molecular oxygen through the mixture for a period of at least about 2 hours, and c. removing the mixture from the treatment zone, and separating solids from the purified water; the improvement comprising adding to the mixture in the treatment zone between about 50 and 1500 parts of activated carbon per million parts of feed waste water, said carbon having a surface area of at least 100 square meters per gram and a particle size such that it will pass through a 200 mesh per inch sieve.
Claim 12
Dependent Claim
37 words
The process of claim 1 wherein the mixture of step (a) contains between about 25 and 15,000 parts per million of total suspended solids, and the mixture is agitated in step (b) as the gas is mixed.
Claim 13
Dependent Claim
27 words
The process of claim 2 in which nitrogen salts, phosphorus salts or their mixtures are introduced into the treatment zone during the carrying out of step (a).
Claim 14
Dependent Claim
30 words
An improvement in an activated sludge process for continuously purifying waste water to reduce the BOD, COD, and TOC thereof comprising a. contacting in a treatment zone a mixture of
Claim 15
Dependent Claim
30 words
An improvement in an activated sludge process for continuously purifying waste water to reduce the BOD, COD, and TOC thereof comprising a. contacting in a treatment zone a mixture of
Claim 16
Dependent Claim
22 words
The process of claim 5 in which the waste water and activated sludge are combined prior to entry into the treatment vessel.
Claim 17
Dependent Claim
40 words
The process of claim 5 wherein activated carbon is added at a rate sufficient to supply between about 30 and about 1000 square meters of surface area of carbon for every liter of waste water supplied to the treatment zone.
Claim 18
Dependent Claim
37 words
The process of claim 5 wherein the mixture of step (a) contains between about 300 and 15,000 parts per million of total suspended solids and the mixture is agitated in step (b) as the gas is mixed.
Claim 19
Dependent Claim
24 words
The process of claim 5 wherein the ratio of ppm of activated carbon to ppm of BOD fed is maintained between 0.25 and 3.5.
Claim 20
Dependent Claim
130 words
The process of claim 8 wherein the waste water feed has a pH of between about 6.5 and 7.5; the waste water is fed to a treatment zone containing an aqueous slurry of activated sludge, and activated carbon which has a surface area between about 600 and 1000 square meters per gram; a portion of the agitated mixture is removed continuously; and there is continuously fed to the treatment zone waste water, activated sludge and activated carbon at such rates that the amount of total mixed liquor solids in the zone is maintained at a concentration between about 300 and 15,000 parts per million and the activated carbon is added at a rate between about 50 and 500 parts per million parts of waste water fed to the treatment zone.
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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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |