Patent US4069148A successfully refreshed from Google Patents.
US4069148A
Expired / Lapsed
US
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Industrial waste water treatment process
Assignee: US Filter Zimpro Inc
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Filing: 1971-05-27
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Granted: 1978-01-17
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Expires: 1991-05-27
Abstract
Abstract Industrial waste water, containing impurities which poison or otherwise inhibit bacterial forms employed in biological treatment of 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. Despite the presence of the poisonous or inhibiting impurities, 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
2026-11-05 23:35
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: 10
Claim 1
Independent Claim
182 words
A process for continuously purifying industrial waste water containing impurities which inhibit or poison bacterial forms employed in biological treatment of waste water, said process consisting of: A. contacting in a treatment zone a mixture of 1. industrial waste water which has a pH of between about 4 and 11 and which optionally has been subjected to primary treatment to remove solids, 2. 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, and 3. activated carbon added at a rate sufficient to supply between about 4 and about 1,000 square meters of surface area of carbon for every liter of waste water supplied to the treatment zone 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, B. mixing a gas containing molecule oxygen through the mixture for a period of at least about 2 hours, and C. removing the mixture from the treatment zone.
Claim 2
Dependent Claim
182 words
A process for continuously purifying industrial waste water containing impurities which inhibit or poison bacterial forms employed in biological treatment of waste water, said process consisting of: A. contacting in a treatment zone a mixture of 1. industrial waste water which has a pH of between about 4 and 11 and which optionally has been subjected to primary treatment to remove solids, 2. 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, and 3. activated carbon added at a rate sufficient to supply between about 4 and about 1,000 square meters of surface area of carbon for every liter of waste water supplied to the treatment zone 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, B. mixing a gas containing molecule oxygen through the mixture for a period of at least about 2 hours, and C. removing the mixture from the treatment zone.
Claim 3
Dependent Claim
51 words
The process of claim 1 wherein the total solids content of (A)(2) is between about 25 and 15,000 parts per million, the mixture is agitated in (B) as the gas is mixed, and solids are separated from the water in step (C) after the mixture is removed from the treatment zone.
Claim 4
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 5
Dependent Claim
170 words
A process for continuously purifying industrial waste water, said process consisting of: A. contacting in a treatment zone a mixture of 1. industrial waste water which has a pH between about 4 and 11 and which optionally has been subjected to primary treatment to remove solids, 2. activated sludge in an amount sufficient to provide a total solids content of the mixture between about 300 and 50,000 parts per million and 3. activated carbon added at a rate sufficient to supply between about 4 and about 100 square meters of surface area of carbon for every liter of waste water supplied to the treatment zone 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, B. 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 supernatant water.
Claim 6
Dependent Claim
170 words
A process for continuously purifying industrial waste water, said process consisting of: A. contacting in a treatment zone a mixture of 1. industrial waste water which has a pH between about 4 and 11 and which optionally has been subjected to primary treatment to remove solids, 2. activated sludge in an amount sufficient to provide a total solids content of the mixture between about 300 and 50,000 parts per million and 3. activated carbon added at a rate sufficient to supply between about 4 and about 100 square meters of surface area of carbon for every liter of waste water supplied to the treatment zone 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, B. 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 supernatant water.
Claim 7
Dependent Claim
23 words
The process of claim 4 in which components (1) and (2) of step (A) are combined prior to entry into the treatment zone.
Claim 8
Dependent Claim
24 words
The process of claim 4 wherein the ratio of ppm of activated carbon to ppm of BOD feed is maintained between 0.25 and 3.5.
Claim 9
Dependent Claim
33 words
The process of claim 4 wherein the total solids content of (A)(2) is between about 300 and 15,000 parts per million and the mixture is agitated in (B) as the gas is mixed.
Claim 10
Dependent Claim
105 words
The process of claim 7 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 1,000 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 treatment zone is maintained at a concentration between about 300 and 15,000 parts per million.
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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) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |