Process for removing multivalent metals from waste effluents

Details Process for removing multivalent metals from waste effluents Process for removing multivalent metals from waste effluents

1978-09-25

1982-03-23

Wyse, Thomas G.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210722, 210725, 210912, 210913, C02F 162

Patent

active

043211496

ABSTRACT:
The multivalent metals of iron and chromium are removed by reducing the metal values to their lowest valence state by acidifying to a pH of below about 6 and adding an excess of hydrogen peroxide. The reduction is conducted at the foregoing pH value and in the presence of a sufficient amount of an organic compound which is a stronger reducing agent than the metal in its lowest valence state. Thereafter, a sufficient amount of a reactive metal hydroxide source is added to raise the pH above about 7 and to form a metal hydroxide with the metal in its lowest valence state. The resulting metal hydroxide is then easily removed from the aqueous effluent.

REFERENCES:
patent: 3784669 (1974-01-01), Elges et al.
patent: 3896209 (1975-07-01), Fournier et al.

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