Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1970-10-01
1976-05-11
Wyse, Thomas G.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 47, C02C 502
Patent
active
039561186
ABSTRACT:
A method for chemically removing phosphates from waste waters by treating the phosphate-containing waste water with a trivalent rare earth salt, generally as a mixture of such salts, to form an insoluble rare earth phosphate precipitate, and then separating the precipitate from the waste water. The rare earth precipitant salt, such as lanthanum chloride or sulfate, may be regenerated by treating the rare earth phosphate precipitate with a strong or weak alkali as regenerant, preferably aqueous sodium hydroxide or sodium carbonate, to form a soluble alkali metal phosphate. The aqueous alkali regenerant may be recovered by treatment of the formed sodium phosphate with lime to precipitate the phosphate as a calcium phosphate complex salt.
Where it is desired to precipitate phosphate but avoid regeneration of the rare earth precipitant salt, a combination treatment using aluminum-lanthanum or iron-lanthanum as precipitant salt is preferred.
REFERENCES:
patent: 2872286 (1959-02-01), Finzel
patent: 3259568 (1966-07-01), Jordan et al.
patent: 3347786 (1967-10-01), Baer et al.
patent: 3617569 (1971-11-01), Daniels et al.
patent: 3692671 (1972-09-01), Recht et al.
patent: 3736255 (1973-05-01), Ghassemi et al.
Kleber Eugene V.
Recht Howard L.
Humphries L. Lee
Kolin Henry
Rockwell International Corporation
Wyse Thomas G.
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