Waste water treatment

Details Waste water treatment Waste water treatment

1978-09-07

1980-02-19

Hart, Charles N.

Liquid purification or separation

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

Responsive to fluid flow

210 37B, 210 38B, 210 44, C02C 508

Patent

active

041893816

ABSTRACT:
Waste water containing over 2 ppm Mo and at least one heavy metal impurity selected from the group consisting of Fe, Mn, Cu, Zn, Pb, and Cd, and also containing cyanide ion (CN) is treated by passing waste water having an adjusted pH value ranging from about 3 to 4 through an ion-exchange resin column selective to the removal of Mo and provide an ion-exchange effluent containing at least one of said heavy metal impurities and said cyanide ion. The pH value of the effluent is then adjusted to a range of about 7 to 11 sufficient to precipitate the heavy metal impurity having the highest pH requirement for precipitation, following which the precipitate is flocculated and the effluent containing the flocculated precipitate then subjected to electrolysis using insoluble electrodes to form electrolytic oxygen and hydrogen and effect electroflotation of the flocculated precipitate and form a froth thereof which is separated from the effluent by skimming.

REFERENCES:
patent: 3617539 (1971-11-01), Grutsch et al.
patent: 3766035 (1973-10-01), Ichiki et al.
patent: 3788983 (1974-01-01), Fries
patent: 3826741 (1974-07-01), Nakamura
patent: 3972810 (1976-08-01), Chopra

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