Process for reducing dissolved inorganic orthophosphates to PPB

Details Process for reducing dissolved inorganic orthophosphates to PPB Process for reducing dissolved inorganic orthophosphates to PPB

1975-11-12

1976-06-22

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

C02C 140

Patent

active

039650022

ABSTRACT:
A continuous, steady-state process for precipitating dissolved orthophosphate from an aqueous system, wherein a slurry of seed crystals of calcium phosphate, formed under critical conditions, is introduced into a reactor region, the phosphate-containing water is fed into the region under certain conditions of pH and calcium content, and the dissolved phosphates are precipitated at a rate equal to the feed rate, such that the residual dissolved phosphorus level of the treated water is below 50 parts per billion.

REFERENCES:
patent: 3716484 (1973-02-01), Lincoln et al.
Ferguson et al. "Calcium Phosphate Precipitation At Slightly Alkaline pH Values," Journal W.P.C.F. vol. 45, No. 4 Apr. 1963 pp. 620-631.

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