US3755157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing drinking water from contaminated ground and surface water
Assignee: Adsorptionstechnik Lab F GmbH
•
Filing: 1971-07-22
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Granted: 1973-08-28
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Expires: 1991-07-22
Abstract
Abstract Organically contaminated water containing micro-organisms is purified by first oxygenating the raw water and passing it through a coarse-particle activated-carbon bed, thereafter further oxygenating the effluent from the first bed and passing it through a second bed, and chlorinate the effluent from the latter. The water traverses the bed with a specific loading of less than 4 hr 1, the chlorine or other disinfectant is added in an amount greater than 0.05 and less than about 0.5 mg/liter of chlorine, and only the second bed is reactivated or regenerated.
Inventors
- 👤 W Wisfeld
- 👤 H Wirth
- 👤 W Lotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:32
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/725; C02F1/28; C02F1/283
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
The process defined in claim 1, further comprising the step of: f. oxygenating said first effluent prior to introducing it into said adsorption filter bed.
Claim 2
Dependent Claim
32 words
The process defined in claim 2 wherein said adsorption filter bed includes a plurality of activated carbon layers traversed in series by the oxygenated first effluent and of progressively smaller particle size.
Claim 3
Dependent Claim
82 words
The process defined in claim 2, further comprising the step of: g. passing the activated carbon generally counter-current to said second effluent in step (c), the activated carbon being withdrawn for regeneration in step (e) at a location relatively proximal to the inlet of the second effluent to said adsorption filter bed and being returned upon regeneration to said adsorption filter bed at a point relatively proximal to the location at which said second effluent is discharged from said adsorption filter bed.
Claim 4
Dependent Claim
20 words
The process defined in claim 4 wherein said specific loading is between substantially 3 hr 1 and 1 hr 1.
Claim 5
Dependent Claim
25 words
The process defined in claim 5 wherein between 0.05 and 0.5 mg of chlorine is added per liter of said second effluent in step (d).
Claim 6
Dependent Claim
45 words
The process defined in claim 6 wherein the particle size of the activated carbon particles in said nonregenerated bed is between 1.5 and 5 mm, and the particle size of the activated carbon particles in said adsorption filter bed is between 0.5 and 2.5 mm.
Claim 7
Dependent Claim
25 words
The process defined in claim 7 wherein said raw water and said first effluent are oxygenated by trickling same countercurrent to an oxygenated gas stream.
References Cited (Backward Citations)
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Cited
US2992986A
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US3244621A
Cited
US3296122A
Cited
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Cited
US3658697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |