US 6,183,647 B2 · Method and apparatus for treatment of liquid

Abstract

The invention relates to a method for treatment of liquid, that is meant particularly for filtering of pressurized liquid, such as water led from a water distribution system, by way of an apparatus, which has an essentially closed frame (1), in connection with which there has been arranged at least a filtering device (2) for purifying of liquid and a flow device (3), such as feed-flow and/or exhaust flow arrangements (3a, 3b) for leading of liquid. The filtering device (2) is made of thin filtering film (2a), advantageously made of plastic based material, such as PTM (Particle Track Membrane), TeM (Track-etch Membrane) or like, the thickness of which is preferably 7-25 μm and the size of pores of which is 0.05-10 μm. The filtering film (2a) belonging to a filtering device (2) are being purified essentially self-powered, such as by way of a purification device (5) exploiting the pressure (p) or the movement (v1) of the liquid to be treated and/or the liquid that has been treated. The invention relates to an apparatus operating according to the method as well.

Claims18

Dependent claims

A method for treating liquid, the method comprising:

providing an apparatus comprising an essentially closed body, filtering means connected with the body for purifying liquid and comprising a filtering film defining a sandwich structure in which a secondary space for treated liquid is surrounded by a primary space for liquid to be treated, the filtering film comprising a particle track membrane or a track-etch membrane, the filtering film separating the treated liquid from the liquid to be treated, flow means connected with the body for introducing and removing liquid from the body, a support for supporting the filtering film, an intermediate storage space for storing filtered liquid downstream of the filtering means, and essentially self-powered purifying means for purifying the filtering means by cleaning the filtering film, whereby a primary side of the filtering film facing the primary space is flushed by a by-pass flow of the liquid to be treated passing the filtering film essentially tangentially;
and
purifying the filtering means utilizing inverse flow by feeding treated liquid from the intermediate storage space through the filtering means in an opposite direction with respect to a filtration flow.

An apparatus for treating liquid, comprising:

an essentially closed body;
filtering means connected with the body for purifying liquid, the filtering means comprising a filtering film defining a sandwich structure in which a secondary space for treated liquid is surrounded by a primary space for liquid to be treated, the filtering film comprising a particle track membrane or a track-etch membrane;
flow means connected with the body for introducing and removing liquid from the body;
a support for supporting the filtering film;
an intermediate storage space for storing filtered liquid downstream of the filtering means;
and
purifying means for purifying the filtering means, the purifying means being arranged to flush a primary side of the filtering means facing the primary space by means of a by-pass flow of the liquid to be treated passing the filtering film essentially tangentially, the purifying means being arranged to purify the filtering means through inverse flow, the inverse flow comprising transferring treated liquid from the intermediate storage space through the filtering means in an opposite direction with respect to a filtration flow.

4 more elements

Dependencies are inferred from the claim text.

Method and apparatus for treatment of liquid

Life of this patent

Method and apparatus for treatment of liquid

Life of this patent

Abstract

Claims18