Process for treating lightly contaminated acid mine water

Details Process for treating lightly contaminated acid mine water Process for treating lightly contaminated acid mine water

2005-11-08

2005-11-08

Hoey, Betsey Morrison (Department: 1724)

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

C210S724000, C210S746000, C210S748080, C210S806000, C210S912000

Reexamination Certificate

active

06962662

ABSTRACT:
A process for removing metal sulfates from dilute aqueous solutions in which a conductivity control solution is injected into the stream. The solution is selected to increase the conductivity of the stream to a value wherein the ion state of each metal is then modified by passing the stream between electrodes of each pair of an array of pairs of electrodes. A voltage is imposed across each pair of electrodes, selected according to a target ion state for each of the various contaminants. The pH of the stream is then increased to a value where precipitate of metal hydroxide of the metal sulfates are formed. The precipitated metal hydroxide is then removed from the stream leaving a reduced amount of sulfate ions. A chemical is added to the stream in sufficient concentration to precipitate remaining sulfate ions from the waste stream which are removed by settling/filtering

REFERENCES:
patent: 5427691 (1995-06-01), Kuyucak et al.
patent: 5482696 (1996-01-01), Honigschmid-Grossich et al.
patent: 5698107 (1997-12-01), Wurzburger et al.
patent: 6110379 (2000-08-01), Overton et al.
patent: 6174444 (2001-01-01), Smit

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