US3733266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste water purification by breakpoint chlorination and carbon adsorption
Assignee: ADMINISTRATOR OF ENVIRONME
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Filing: 1971-09-07
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Granted: 1973-05-15
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Expires: 1991-09-07
Abstract
Abstract SODIUM HYPOCHLORITE OR CHLORINE IS USED TO OXIDIZE THE AMMONIA IN RAW, SECONDARY AND LIMECLARIFIED MUNICIPAL WASTEWATERS USING BREAKPOINT CHLORINATION. CARBON ADSORPTION COLUMNS ARE LOCATED DOWNSTREAM FROM THE BREAKPOINT CHLORINATOR. IN WASTEWATER, THE BREAKPOINT REQUIRES A MINIMUM CHLORINE DOSE OF APPROXIMATELY AN 8:1 WEIGHT RATIO OF CL:NH3-N IN LIME CLARIFIED SECONDARY EFFLUENT. A SLIGHT CHLORINE EXCESS IS USED WHICH IS ADSORBED BY THE CARBON THEREBY INHIBITNG SLIME BUILDUP.
Inventors
- 👤 D Bishop
- 👤 A Cassel
- 👤 T Pressley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:49
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |