Patent US4289626A successfully refreshed from Google Patents.
US4289626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wastewater treatment
Assignee: US Filter Zimpro Inc
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Filing: 1980-03-07
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Granted: 1981-09-15
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Expires: 2000-03-07
Abstract
Abstract The invention relates to method and apparatus for the treatment of wastewaters using a rotating biological contactor in combination with an adsorbent.
Inventors
- 👤 Paul V. Knopp
- 👤 Walter Burant, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:18
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1205; C02F3/1226; C02F3/08; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
A process for treating wastewater comprising the following steps: a. contacting wastewater in a stream in a biological contactor apparatus which has a multiplicity of surfaces therein alternately immersed in the stream and air above the stream, for a period of time of at least 1/2 hour while adding co-currently to the stream in the biological contactor apparatus an adsorbent capable of adsorbing impurities from the wastewater; and b. removing accumulated suspended solids from the contactor apparatus at a rate substantially equivalent to the rate at which solids accumulate within the contactor.
Claim 2
Dependent Claim
92 words
A process for treating wastewater comprising the following steps: a. contacting wastewater in a stream in a biological contactor apparatus which has a multiplicity of surfaces therein alternately immersed in the stream and air above the stream, for a period of time of at least 1/2 hour while adding co-currently to the stream in the biological contactor apparatus an adsorbent capable of adsorbing impurities from the wastewater; and b. removing accumulated suspended solids from the contactor apparatus at a rate substantially equivalent to the rate at which solids accumulate within the contactor.
Claim 3
Dependent Claim
14 words
A process according to claim 1 in which the adsorbent is powdered activated carbon.
Claim 4
Dependent Claim
19 words
A process according to claim 1 in which the amounts of adsorbent added ranges from 25 to 5000 mg/l.
Claim 5
Dependent Claim
20 words
A process according to claim 1 including the step of removing solids from the wastewater prior to the contacting step.
Claim 6
Dependent Claim
43 words
A process according to claim 1 in which the contacting surfaces comprise a series of discs mounted on a common shaft which is rotated to alternately immerse the disc and its associated biological film in the stream and in gas above the liquid.
Claim 7
Dependent Claim
120 words
A process for treating wastewater comprising the following steps: a. contacting wastewater in a stream in a biological contactor apparatus which has a multiplicity of surfaces therein alternately immersed in the stream and air above the stream, for a period of time of at least 1/2 hour while adding to the stream an adsorbent capable of adsorbing impurities from the wastewater, and b. removing accumulated suspended solids from the contactor apparatus at a rate substantially equivalent to the rate at which solids accumulate within the contactor, wherein the adsorbent is added at the downstream end of the biological contactor apparatus and is moved by the surfaces in the contactor apparatus in countercurrent relationship with the bulk of the liquid flow.
Claim 8
Dependent Claim
120 words
A process for treating wastewater comprising the following steps: a. contacting wastewater in a stream in a biological contactor apparatus which has a multiplicity of surfaces therein alternately immersed in the stream and air above the stream, for a period of time of at least 1/2 hour while adding to the stream an adsorbent capable of adsorbing impurities from the wastewater, and b. removing accumulated suspended solids from the contactor apparatus at a rate substantially equivalent to the rate at which solids accumulate within the contactor, wherein the adsorbent is added at the downstream end of the biological contactor apparatus and is moved by the surfaces in the contactor apparatus in countercurrent relationship with the bulk of the liquid flow.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |