Liquid purification system

Abstract

The invention relates to liquid predominantly water purification systems of membrane type and/or of desalination type with recirculation used in industry household and/or drinking water supply on factories, water treatment stations, public institutions, household, in country side.

Liquid purification system with predetermined ratio between purified and drainage liquid, containing raw liquid line equipped with pump, membrane element, connected to purified liquid line and recircualtion line, equipped with pressure regulator, and connected to drainage liquid line, characterized in that it is configured to spontaneous pressure maintenance not less than necessary to carry out the filtration process, because pressure regulator is made as mechanical spring valve, and the ratio between raw liquid feed velocity and total velocity of purified liquid and drainage liquid withdrawal more than 1. 1 independent and 2 dependent claims, 1 figure.

Claims

1. Liquid purification system with predetermined ratio between purified and drainage liquid, containing raw liquid line equipped with pump, membrane element, connected to purified liquid line and recirculation line, equipped with pressure regulator, and connected to drainage liquid line, characterized in that it is configured to spontaneous pressure maintenance not less than necessary to carry out the filtration process, because pressure regulator is made as mechanical spring valve, and the ratio between raw liquid feed velocity and total velocity of purified liquid and drainage liquid withdrawal is more than 1.

2. Liquid purification system according to claim 1 characterized in that drainage liquid line is equipped with liquid flow regulator.

3. Liquid purification system according to claim 1 characterized in that the ratio between diameters of drainage and purified liquid lines provide constant ratio between liquid flow velocity on drainage line and liquid flow velocity on purified liquid line.

Description

[0016] FIG. 1 describes liquid purification system.

[0017] Liquid purification system consists of raw liquid line (1) equipped with the pump (2), connected to membrane element (3), which has two outlets outlet for purified liquid and outlet for drainage liquid, purified liquid line (4), drainage liquid line (5) and recirculation line (6). Outlet for purified liquid of membrane element (3) is connected to purified liquid line (4), outlet for drainage liquidto recirculation line (6). Drainage liquid line (5) is equipped with flow regulator (7). Flow regulator (7) may be made as servomotor tap, for example needle or ball. Flow regulator (7) may additionally function as rapid washing valve of the system before start and after stop of the system. Drainage liquid line (5) is connected to recirculation line (6) before flow regulator (7) and to raw liquid line (1) before the pump (2). Pressure regulator valve (8) is installed on recircultation line (6) after drainage liquid line (5) inlet. Pressure regulator valve (8) can be made as spring operated valve, return spring valve or disk valve which creates resistance on recirclution line (6) and provides liquid flow on drainage liquid line (5). Membrane element (3) may be made as one or several. reverse osmosis membranes, or one or several hollow fiber modules. Purification line (4) and drainage liquid line (5) may be equipped with traducers or flow-neters (not depicted in the figures). Additionally at least one prefilter (not depicted in the figures) may be installed on raw liquid line (1) before the pump (2), made as carbon block or bed filter. Additionally at least one postfilter (not depicted in the figures) may be installed on purified liquid line (4), made as hollow fiber module or carbon block.

[0018] The system can additionally be equipped with control panel (not depicted in the figures), made as, for example, controller.

[0019] Within distinguishing features the claimed system operates as follows. Raw liquid flows along the raw liquid line (1) goes through the pump (2) into membrane element (3). Purified liquid flows to purified liquid line (4). Drainage liquid flows into recirculation line (6), from where it partly returns to raw liquid line (1), and partly returns to drainage line (5). At the beginning drainage liquid in greater amount flows along the drainage liquid line (5) out of the system, but as within time membrane element (3) clogs, more and more amount of liquid flows into recircultaion line (6). At the same time the ratio between purified and drainage liquids is the same. It is possible due to two means. As purified liquid line (4) and drainage liquid line (5) are made as pipes, so the pipe diameter is chosen so as to keep necessary ratio between purified and drainage liquids, for example 4:1 (not depicted in the figure). Or flow regulator (7) is installed on drainage liquid line (FIG. 1), which sets the necessary ratio between purified and drainage liquid. So independent to changes in membrane elements (3) capacity, amount of purified liquid supplied to the consumer will be constant during system operation time. As with time membrane elements (3) capacity decreases, the amount of liquid which flows to drainage liquid line (5) will increase. But at the same time only predeterminer amount of liquid flows along drainage liquid line (5). So when extra amount of liquid will flow into the inlet of drainage liquid line (5) the pressure will rise. Pressure regulator (8) is installed on recirculation line (6), made as spring valve. The spring in pressure regulator (8), constricts from over-pressure of drainage liquid, and drainage liquid passes through pressure regulator (8) and flows into recirculation line (6) and then into pump (2).

[0020] Opposed to the closest analogue the only one variable parameter in the claimed invention is the pressure in recirculation line (6). This pressure is used to create total flow of drainage liquid and raw liquid, providing the ratio between raw liquid feed velocity and total velocity of purified liquid and drainage liquid withdrawal more than 1.

[0021] The description of the present invention submits a preferred embodiment of the invention. It can be changed within the claimed set of the claims, so the wide use of the invention is possible.