Recovery of phosphate from phosphate containing pond water
Abstract
Abstract A CONTINUOUS PROCESS FOR TREATING A WASTE AQUEOUS STREAM CONTAINING PHOSPHATE VALUES TO RECOVER SAID PHOSPHATE VALUES INCLUDING INITIALLY REMOVING CONTAMINATING CATIONS FROM THE WASTE AQUEOUS STREAM BY CONTACTING THE SAME WITH A CATION EXCHANGE RESIN BED AND THEN CONTACTING THE ESSENTIALLY CONTAMINATING CATION-FREE AQUEOUS STREAM WITH AN ANION EXCHANGE RESIN BED TO ELIMINATE THE PHOSPHATE VALUES THEREFROM AND THEN REMOVING THE PHOSPHATE VALUES LOADED ON THE ANION EXCHANGE RESIN WITH A REGENERATING AGENT. IN ANOTHER EMBODIMENT, THE WASTE AQUEOUS STREAM BY-PASSES THE CATION EXCHANGE RESIN AND IS CONTACTED ONLY WITH A WEAK-BASE ANION EXCHANGE RESIN WHICH IS, THEREAFTER, CONTACTED WITH A REGENERATING AGENT, SUCH AS AMMONIUM HYDROIDE TO LIBERATE THE PHOSPHATE VALUES THEREFROM.
Inventors
- 👤 Irwin R Higgins
Bibliographic Details
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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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |