Method of treating waste waters containing solid-phase difficult

Details Method of treating waste waters containing solid-phase difficult Method of treating waste waters containing solid-phase difficult

1978-01-03

1979-09-25

Hart, Charles N.

Liquid purification or separation

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

Responsive to fluid flow

75109, 210 52, 210 56, 210DIG30, 423142, 423594, C02B 120, C02C 502

Patent

active

041690532

ABSTRACT:
A method is provided for treating waste water containing solids of difficultly-soluble compounds of at least one heavy metal, the method comprising the steps of adding an amount of ferrous ions to said waste water corresponding on a molar basis to about 2 to 100 times the total molar amount of heavy metal present in said waste water, adding an alkaline substance to said waste water in an amount corresponding to about 0.9 to 1.2 equivalent of free acid present in said waste water, and stirring the waste water without aeration at a temperature of at least about 40.degree. C., whereby insoluble ferrite crystals are precipitated having said heavy metal incorporated therein.

REFERENCES:
patent: 3428416 (1969-02-01), Gie et al.
patent: 3686347 (1972-08-01), Dean et al.
patent: 3752759 (1973-08-01), Burg et al.
patent: 3887479 (1975-06-01), McLain
patent: 3931007 (1976-01-01), Sugano et al.

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