Method of removing heavy metals from industrial waste streams

Details Method of removing heavy metals from industrial waste streams Method of removing heavy metals from industrial waste streams

1980-08-04

1982-08-10

Hruskoci, Peter A.

Liquid purification or separation

Processes

Ion exchange or selective sorption

75109, 210711, 210712, 210717, 210724, 210912, 210913, 423140, C02F 152

Patent

active

043437060

ABSTRACT:
Heavy Metals contained in industrial waste streams are removed therefrom by flocculation using a source of ferric ions and an alkaline material at a basic pH. Both the flocculated heavy metals and the coagulant chemicals are recovered by acidifying the floc to a pH of between 3.2 and 3.7. This liberates the heavy metals back into solution but does not destroy the floc particles. After separation and removal of the concentrated heavy metal solution, the floc is further acidified to completely dissolve it. This dissolved ferric ion containing solution may then be reused to treat succeeding portions of heavy metal containing waste streams. The concentrated heavy metals solution may also be recycled or the metals contained therein recovered for reuse or disposed of in an acceptable manner.

REFERENCES:
patent: 2128569 (1938-08-01), Velz
patent: 3347786 (1967-10-01), Baer et al.
patent: 3494864 (1970-02-01), Willihnqanz
patent: 3725266 (1973-04-01), Haviland
patent: 3800024 (1974-03-01), Forsell et al.
patent: 4040955 (1977-08-01), Davidson
patent: 4163716 (1979-08-01), Turnbull
patent: 4210530 (1980-07-01), Etzel et al.
patent: 4222872 (1980-09-01), Ramirez
Anand, "Eval. of a Chem. Coagulation & Coagulant Reuse Process for Treating Heavy Metal Waste," Purdue University, Thesis, Apr. 27, 1979.

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