Removal of phosphate from waste water

Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Removal of phosphate from waste water does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Removal of phosphate from waste water, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Removal of phosphate from waste water will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1301116

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.