Precipitating agent for dephosphatizing effluent

Details Precipitating agent for dephosphatizing effluent Precipitating agent for dephosphatizing effluent

1979-09-20

1981-05-12

Castel, Benoit

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210906, C02F 152

Patent

active

042670586

ABSTRACT:
A precipitating agent for the dephosphatization of effluent comprising by weight about 5 to 75% of active iron (III) sulphate, about 25 to 95% of active iron (III) oxide and 0 to about 10% of anhydrous magnesium sulphate. Optionally, an alkaline constituent such as the oxide or hydroxide of calcium or magnesium may also be present and dephosphatization is effected at a pH of about 4.5 to about 8.5. Extremely low contents of residual phosphorous can be obtained in the filtrate, a precipitate containing iron and phosphorous settling out cleanly.

REFERENCES:
patent: 3499837 (1970-03-01), Jaunarajs
patent: 3655552 (1972-04-01), Flock, Jr. et al.
patent: 3827984 (1974-08-01), Kawert
patent: 4118319 (1978-10-01), Miyanohara et al.
Gleisberg D. et al., "Phosphate Precipitation in Municipal Effluent," Chem. Ing. Tech., vol. 45 (20), pp. 1225-1226, (1973).

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