Process for removing metals from water

Details Process for removing metals from water Process for removing metals from water

1987-06-29

1989-03-21

Wyse, Tom

Liquid purification or separation

Processes

Ion exchange or selective sorption

210669, 210718, 210725, 210806, 210912, 210914, C02F 162

Patent

active

048140910

ABSTRACT:
A process for removing metals from water including the steps of prefiltering solids from the water, adjusting the pH to between about 2 and 3, reducing the amount of dissolved oxygen in the water, increasing the pH to between about 6 and 8, adding water-soluble sulfide to precipitate insoluble sulfide- and hydroxide-forming metals, adding a flocculating agent, separating precipitate-containing floc, and postfiltering the resultant solution. The postfiltered solution may optionally be eluted through an ion exchange resin to remove residual metal ions.

REFERENCES:
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patent: 3790370 (1974-02-01), Lalancette
patent: 4005009 (1977-01-01), Kinoshita et al.
patent: 4147626 (1979-04-01), Findlay et al.
patent: 4364773 (1982-12-01), Veronneau et al.
patent: 4420401 (1983-12-01), Kretas et al.
patent: 4422943 (1983-12-01), Fender et al.
patent: 4432880 (1984-02-01), Talbot
patent: 4566975 (1986-01-01), Allgulin
patent: 4614592 (1986-09-01), Googin et al.
patent: 4624790 (1986-11-01), Kamperman et al.

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