Process and device for the separation of substances dissolved in

Details Process and device for the separation of substances dissolved in Process and device for the separation of substances dissolved in

1995-06-14

1997-03-04

Fortuna, Ana

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210651, 210652, 210653, 2101952, B01D 6100

Patent

active

056075928

ABSTRACT:
The present invention concerns a process and a device for the separation of substances dissolved in the washing waters used in a processing bath for a photographic film.
The photographic film, after passing through the processing bath, is caused to pass successively through at least two washing tanks, the process consisting of causing the waste water from the washing baths to circulate through a nanofiltration membrane device, the permeate from the said nanofiltration device being recirculated to the washing tank or tanks other than the last of the tanks in which the film passes, the last of the tanks being fed with clean water from an auxiliary source.

REFERENCES:
patent: 4451132 (1984-05-01), Kishimoto
patent: 4610792 (1986-09-01), Van Gils et al.
patent: 5164092 (1992-11-01), Munch

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