Conditioning process and device for producing pure water

Details Conditioning process and device for producing pure water Conditioning process and device for producing pure water

1995-03-21

1997-11-25

Fortuna, Ana

Liquid purification or separation

Processes

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

210650, 210 85, 210 89, 210134, 210138, 21032169, 210652, B01D 6100

Patent

active

056908296

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention pertains to a process for the production of pure water, in which raw water, or feed water similarly, is fed to a treatment apparatus that has at least one semi-permeable membrane, in conjunction with which a partial quantity of the raw water passes through the membrane as pure water under the driving force of a pressure differential, and the remaining quantity of raw water that flows past the membrane leaves the treatment apparatus as concentrate.
The invention is also concerned with a treatment apparatus for the production of pure water, with at least one semi-permeable membrane which separates a raw water, or feed water, area from a pure water area in such a way that a partial quantity of the raw, or feed water that flows past the membrane passes through the membrane as pure water under the driving force of a pressure differential, in conjunction with which the treatment apparatus has at least two openings that feed into its raw water, or feed water, area, one apparatus opening of which is used as a water inlet for feeding the raw, or feed water to the membrane, and the other apparatus opening of which is provided as a water outlet for the concentrate, and in conjunction with which the treatment apparatus exhibits at least one pure water outlet in its pure water area.


BACKGROUND OF THE INVENTION

With ultrafiltration, microfiltration, and, in particular, the reverse osmosis technique, various procedures are already known for the production of pure water, in which from raw water that is charged with a mixture of substances, pure water that is less charged than the raw water is produced by means of a semi-permeable membrane.
Thus, a treatment apparatus that exhibits a so-called winding module within an apparatus housing is already known. This winding module is comprised of several double-walled flat membranes that are wound in spiral fashion around a filtrate collector pipe. While the filtrate collector pipe and the interior membrane areas, enclosed by the two walls of each membrane, are a part of the pure water area of the previously known treatment apparatus, the outer walls of the flat membranes, which overlap and are held at a slight distance, limit its raw water area. The raw water flows into the raw water area of the winding module at the one end, to leave this raw water area at the other, opposite end of the module as concentrate. As this is taking place, only a partial quantity of the raw water that flows past the flat membranes passes through them as pure water under the driving force of a pressure differential.
Since the raw water flows only in one direction through the winding module of the previously known treatment apparatus, the winding module exhibits a ring seal only at the end that is facing the direction of flow--a ring seal whose sealing lips point against the direction of flow and towards the inner wall of the adjacent apparatus housing and seal off the annular gap between the inner wall of the apparatus housing and the outer side of the tubularly wound winding module.
As is the case with other membrane modules, a winding module of such a type is also susceptible to impurities and breakdowns. For that reason, there is routinely placed ahead of such modules, in the direction of flow, a sieve-like pre-filter, which is supposed to counteract any dirtying of the membranes by large particles and which has to be changed frequently if the raw water is heavily contaminated. In spite of that, the membranes still get dirtied during periods of operation, particularly in the winding module end area that is facing the direction of flow of the raw water.


SUMMARY OF THE INVENTION

Therefore, the task exists particularly of creating a process for the production of pure water that allows longer periods of operation and greater service intervals for the semi-permeable membranes that are used with it. At the same time, the task exists of creating a treatment apparatus specifically for carrying out this process.
In the case of the process of the type described at t

REFERENCES:
patent: 3502211 (1970-03-01), Poelnitz et al.
patent: 3505215 (1970-04-01), Bray
patent: 4629548 (1986-12-01), Ellis, III
patent: 4936997 (1990-06-01), Taniguchi et al.
patent: 5047154 (1991-09-01), Costock et al.
patent: 5147552 (1992-09-01), Hlavacek et al.
patent: 5364534 (1994-11-01), Anselme et al.

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