US3256179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment process
Assignee: STWB Inc
•
Filing: 1964-06-24
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Granted: 1966-06-14
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Expires: 1984-06-24
Abstract
No abstract record available.
Inventors
- 👤 Gerald H Teletzke
- 👤 Edmunds M Pogainis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:20
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/06; C02F11/08; C02F11/12; C02F3/00; C02F3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A PROCESS FOR INCREASING THE CAPACITY OF A SEWAGE TREATMENT PLANT COMPRISING AN ANAEROBIC DIGESTER WHICH COMPRISES THE STEPS OF (A) OXIDIZING THE DIGESTED SLUDGE AT AT LEAST ABOUT 120* C. BY WET AIR OXIDATION IN THE PRESENCE AT ALL TIMES OF EXCESS GASEOUS OXYGEN BY AN AMOUNT WHICH REDUCES BY LESS THAN 55 PERCENT THE CHEMICAL OXYGEN DEMAND OF THE SLUDGE. (B) SEPARATING THE RESULTING EFFLUENT FROM THE RESIDUAL SOLIDS, (C) COOLING AT LEAST PORTION OF THE EFFLUENT TO A TEMPERATURE BETWEEN ABOUT 75* AND 108*C., WHICH, WHEN THE COOLED EFFLUENT IS RETURNED TO THE DIGESTER, MAINTAINS THE DIGESTER AT A SUBSTANTIALLY CONSTANT SELECTED TGEMPERATURE BETWEEN ABOUT 30* AND 60*C., (D) RETURNING THE PARTIALLY COOLED EFFLUENT TO THE DIGESTER, (E) REGLUATING TGHE AMOUNT OF AMMONIACAL NITROGEN RETURNED BY THE EFFLUENT TO THE DIGESTER SO AS TO MAINTAIN THE AMMONIACAL NITROGEN LEVEL OF THE CONTENT OF THE DIGESTER BELOW 1.0 GRAM PER LITER.
Claim 2
Dependent Claim
153 words
A PROCESS FOR INCREASING THE CAPACITY OF A SEWAGE TREATMENT PLANT COMPRISING AN ANAEROBIC DIGESTER WHICH COMPRISES THE STEPS OF (A) OXIDIZING THE DIGESTED SLUDGE AT AT LEAST ABOUT 120* C. BY WET AIR OXIDATION IN THE PRESENCE AT ALL TIMES OF EXCESS GASEOUS OXYGEN BY AN AMOUNT WHICH REDUCES BY LESS THAN 55 PERCENT THE CHEMICAL OXYGEN DEMAND OF THE SLUDGE. (B) SEPARATING THE RESULTING EFFLUENT FROM THE RESIDUAL SOLIDS, (C) COOLING AT LEAST PORTION OF THE EFFLUENT TO A TEMPERATURE BETWEEN ABOUT 75* AND 108*C., WHICH, WHEN THE COOLED EFFLUENT IS RETURNED TO THE DIGESTER, MAINTAINS THE DIGESTER AT A SUBSTANTIALLY CONSTANT SELECTED TGEMPERATURE BETWEEN ABOUT 30* AND 60*C., (D) RETURNING THE PARTIALLY COOLED EFFLUENT TO THE DIGESTER, (E) REGLUATING TGHE AMOUNT OF AMMONIACAL NITROGEN RETURNED BY THE EFFLUENT TO THE DIGESTER SO AS TO MAINTAIN THE AMMONIACAL NITROGEN LEVEL OF THE CONTENT OF THE DIGESTER BELOW 1.0 GRAM PER LITER.
References Cited (Backward Citations)
US2359004A
Cited
US3060118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |