Method for removing heavy metals from wastewater

Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...

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210912, 210724, 210725, 210727, 210717, C02F 162, C02F 154

Patent

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051204479

ABSTRACT:
A method for treating wastewater having a pH of between about 0.1 and 14 and containing dissolved heavy metals, in which a substantial portion of the heavy metals is precipitated as crystallized solids embedded within an insoluble monoclinic calcium sulfate crystal to produce a purified effluent having a pH of between 8 and 9.

REFERENCES:
patent: 3855125 (1974-12-01), Lin
patent: 4465597 (1984-08-01), Herman et al.
patent: 4563285 (1986-01-01), Nair et al.
patent: 4566912 (1986-01-01), Borg
patent: 4618429 (1986-10-01), Herrigel
patent: 5013452 (1991-05-01), Walker

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