Electrolytic treatment apparatus

Details Electrolytic treatment apparatus Electrolytic treatment apparatus

1989-04-19

1990-08-14

Valentine, Donald R.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204232, 204240, 204257, 204264, 204293, C25B 1508, C25B 900, C25B 1104, C25B 1502

Patent

active

049484893

ABSTRACT:
An electrolytic treatment method and a unit in which such a method is practiced are provided wherein heavy metal hydrous oxides are precipitated and recovered from a dilute waste stream to render the waste stream suitable for discharge. The waste stream is passed into the cathode chamber of an anion exchange membrane delineated electrolytic cell and subjected to high current density electrolysis to promote the formation of regular, noncompressible metal hydrous oxide crystals. Fluoride ion is added to the precipitate-containing waste stream, the precipitate is filtered and the clarified liquid waste stream is split so that a portion is discharged and a portion is recycled into the metal ion-containing waste stream for further treatment.

REFERENCES:
patent: 3943044 (1976-03-01), Fenn, III et al.
patent: 3975247 (1976-08-01), Stralser
patent: 4053386 (1977-10-01), Schmidt
patent: 4367132 (1983-01-01), Bell et al.
patent: 4384937 (1983-05-01), Shuster et al.
patent: 4572774 (1986-02-01), Wrighton et al.
patent: 4613415 (1986-09-01), Wreath et al.
patent: 4702806 (1987-10-01), Miller et al.

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