Patent US3345288A successfully refreshed from Google Patents.
US3345288A
Expired / Lapsed
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Process for dewatering organic sludges from waste water treatment
Assignee: Individual
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Filing: 1965-02-02
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Granted: 1967-10-03
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Expires: 1985-02-02
Abstract
No abstract record available.
Inventors
- 👤 Sontheimer Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:44
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/12; C02F11/14; C02F11/143; C02F11/145; C02F11/121; C02F11/127; C02F2209/00; C02F2209/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
IN A PROCESS FOR DEWATERING ORGANIC SLUDGES FROM THE TREATMENT OF WASTE WATER WHEREIN SLUDGE IS FIRST THICKENED INTO A HEAVY SLUDGE FRACTION FOLLOWED BY DEWATERING OF THE HEAVY SLUDGE FRACTION ON A MECHANICAL DEWATERING DEVICE INTO A HIGHLY DEWATERED SOLIDS PORTION AND A LIQUID CONTAINING FINE AND COLLOIDAL SOLIDS, THE IMPROVEMENT COMPRISING: (A) ADDING LIME TO SAID LIQUID CONTAINING FINE AND COLLOIDAL SOLIDS; (B) NEUTRALIZING THE LIME TREATED LIQUID WITH CARBON DIOXIDE UNTIL A PH VALUE BELOW 10.0 IS REACHED; (C) THICKENING FOR A SUFFICIENT HOLDING TIME THE LIME AND CARBON DIOXIDE TREATED LIQUID INTO A SUPERNATANT SUBSTANTIALLY FREE OF SUSPENDED SOLIDS AND A THICKENED SEDIMENT; (D) SEPARATELY WITHDRAWING SAID SUPERNATANT LIQUID AND SAID THICKENED SEDIMENT; AND (E) RETURNING THE THICKENED SEDIMENT FROM THE LIME AND NEUTRALIZED CARBON DIOXIDE TREATED LIQUID TO THE MECHANICAL DEWATERING STEP TO THE DEWATERED ALONG WITH THE SLUDGE FRACTION FROM THE FIRST THICKENING STEP.
Claim 2
Dependent Claim
150 words
IN A PROCESS FOR DEWATERING ORGANIC SLUDGES FROM THE TREATMENT OF WASTE WATER WHEREIN SLUDGE IS FIRST THICKENED INTO A HEAVY SLUDGE FRACTION FOLLOWED BY DEWATERING OF THE HEAVY SLUDGE FRACTION ON A MECHANICAL DEWATERING DEVICE INTO A HIGHLY DEWATERED SOLIDS PORTION AND A LIQUID CONTAINING FINE AND COLLOIDAL SOLIDS, THE IMPROVEMENT COMPRISING: (A) ADDING LIME TO SAID LIQUID CONTAINING FINE AND COLLOIDAL SOLIDS; (B) NEUTRALIZING THE LIME TREATED LIQUID WITH CARBON DIOXIDE UNTIL A PH VALUE BELOW 10.0 IS REACHED; (C) THICKENING FOR A SUFFICIENT HOLDING TIME THE LIME AND CARBON DIOXIDE TREATED LIQUID INTO A SUPERNATANT SUBSTANTIALLY FREE OF SUSPENDED SOLIDS AND A THICKENED SEDIMENT; (D) SEPARATELY WITHDRAWING SAID SUPERNATANT LIQUID AND SAID THICKENED SEDIMENT; AND (E) RETURNING THE THICKENED SEDIMENT FROM THE LIME AND NEUTRALIZED CARBON DIOXIDE TREATED LIQUID TO THE MECHANICAL DEWATERING STEP TO THE DEWATERED ALONG WITH THE SLUDGE FRACTION FROM THE FIRST THICKENING STEP.
References Cited (Backward Citations)
US2774693A
Cited
US3168419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |