Device for purifying a fluid

Details Device for purifying a fluid Device for purifying a fluid

2000-01-12

2001-06-26

Walker, W. L. (Department: 1723)

Liquid purification or separation

Recirculation

Serially connected distinct treating or storage units

C210S321600, C210S321750, C210S321840, C210S416100, C210S416300

Reexamination Certificate

active

06251271

ABSTRACT:

TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for purifying, by means of membrane separation, a fluid in a membrane module of pressurised fluid purifiers, said fluid being brought to flow through a filtering unit of the membrane module in a circulating flow, and that the direction of flow of the fluid through a first flow segment of the filtering unit is opposite the direction of flow of the fluid through a second flow segment of the filtering unit. The invention also relates to a membrane module for pressurised fluid purifiers, said membrane module comprising a pressure vessel that has an inlet for fluid to be purified, a permeate outlet for purified fluid, a reject outlet, and that the membrane module further includes a filtering unit provided in the pressure vessel and a circulating pump.
PRIOR ART
In known water purifiers, where membrane separation is used as a purifying method, the water is circulated/looped through the membrane module in order to achieve a high water efficiency. The water loop is usually effected by having the water to pass through the membrane module and returned at the external side of the module to the low pressure side. This re-circulation may either take place directly in a gap between the module and its pressure vessel or in an external tube conduit.
OBJECTS AND FEATURES OF THE INVENTION
An object of the present invention is to define a membrane module having a water flow that at the most is half the water flow of known membrane modules having the corresponding capacity. Further, the membrane module according to the present invention will have essentially smaller dimensions than the corresponding known module modules. This in itself gives rise to the fact that the circulating pump may have a smaller design and will be more efficient. The membrane module according to the invention may also be designed as a replacement unit that is replaced by a new one when it is worn out.
The objects defined above are realised by means of a membrane module that has been given the features of the appending claims. Preferred alternatives of the invention are defined in the dependent claims.


REFERENCES:
patent: 4702842 (1987-10-01), Lapierre
patent: 5066397 (1991-11-01), Muto et al.
patent: 5096583 (1992-03-01), Roux et al.
patent: 0 002 422 (1979-06-01), None
Patent Abstracts of Japan, vol. 97, No. 7, Jul. 31, 1997 (Jul. 31, 1997), abstract of JP 90-85243 A (TOTO LTD), Mar. 31, 1997 (Mar. 31, 1997).

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