Process for reducing the mercury content of industrial waste wat

Details Process for reducing the mercury content of industrial waste wat Process for reducing the mercury content of industrial waste wat

1977-03-22

1978-08-22

Wyse, Thomas G.

Liquid purification or separation

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

Responsive to fluid flow

C02C 504

Patent

active

041087690

ABSTRACT:
The invention deals with the reduction of the mercury content of industrial waste waters, especially those from a chlorine-alkali electrolysis using the amalgam process.
According to the invention all mercury present in the waste water is converted to the form of Hg.sup.++ ions by adding chlorine. Subsequently Fe.sup.++ ions are added. The pH of the solution is raised until a redox potential of from - 0.1 to - 0.8 volts, relative to the normal hydrogen electrode, is obtained. The mercury precipitated and the iron oxide hydrate formed may be filtered from the waste water. Residual mercury contents in the filtrate of about 50 mg/m.sup.3 may be obtained.

REFERENCES:
patent: 3764528 (1973-10-01), Cadmus
patent: 3847598 (1974-11-01), Coulter et al.
patent: 3857704 (1974-12-01), Coulter

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