Process and apparatus for the purification of waste water

Details Process and apparatus for the purification of waste water Process and apparatus for the purification of waste water

1997-05-09

2000-06-27

Fortuna, Ana

Liquid purification or separation

Processes

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

210650, 210636, 210660, 210663, 2101952, 2102572, B01D 6100

Patent

active

060803177

ABSTRACT:
A process and apparatus for the purification of waste water includes a nano-filteration stage (19) which returns a stream of retained substance (20) in a cycle (15, 16, 17, 18) in order to effect a concentration of the content substances. Concentrate (29) is taken out of the cycle and is introduced into a physical and/or chemical treatment stage. At least a part of the treated concentrate (47) is returned into the cycle of the nano-filtration stage (19).

REFERENCES:
patent: 3839206 (1974-10-01), Welch
patent: 4276177 (1981-06-01), Smith
patent: 4434057 (1984-02-01), Marquardt
patent: 4784771 (1988-11-01), Wathen et al.
patent: 4814088 (1989-03-01), Kutowy et al.
patent: 5112489 (1992-05-01), Hartmann
patent: 5362395 (1994-11-01), Dorau et al.
European Search Report of Corresponding Application, EP 96 10 7442 of Oct. 11, 1996.
Derwent Abstract of DE 195 08 786.
Derwent Abstract of DE 41 18 088.
Derwent Abstract of EP 0 379 040.

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