JPH0584489A - Water purifier - Google Patents

Abstract

PURPOSE:To provide a water purifier capable of surely performing backwash of a membrane filtration part in order to prolong usable service life without making the water purifier to large size. CONSTITUTION:Two pieces of water purification cartridges 2 are equipped with both an activated carbon treatment part 5 for treating introduced raw water and a membrane filtration part 6 for filtrating the treated water supplied from the activated carbon treatment part 5 through a membrane. The respective water purification cartridges 2 are provided with both an inlet 14 for supplying washing water for backwash of the membrane and an outlet 8 for discharging waste washing water from a flow path 7 between the activated carbon treatment part 5 and the membrane filtration part 6. The water purifier is constituted so that changeover operation of a water purification state for purifying raw water by two pieces of water purification cartridges, a first backwash state and a second backwash state respectively described below is made free. In the first backwash state, raw water is purified by one side of water purification cartridge 2 and the membrane of the other side of the cartridge 2 is back-washed by this purified water. In the second backwash state, raw water is purified by the other side of cartridge 2 and the membrane of one side of cartridge 2 is back-washed by this purified water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purifier which is connected to a faucet or the like to remove organic substances, free chlorine, suspended matter and microorganisms contained in water. The present invention relates to a water purifier provided with a water purification cartridge that includes an activated carbon treatment unit that treats inflowing raw water with activated carbon, and a membrane filtration unit that membrane-filters treated water from the activated carbon treatment unit and discharges the treated water from a purified water outlet.

[0002]

2. Description of the Related Art In this type of water purifier, when the residence time in the activated carbon treatment section due to water stoppage becomes long, free chlorine having bactericidal ability in water retention is removed, while organic matter in the activated carbon treatment section is removed. Adhesion of organic matter on the surface of activated carbon by adsorption removes the activated carbon treated part from the activated carbon to a hot bed that promotes bacterial growth, so that bacteria grow. And, since the membrane filtration section targets the water from the activated carbon treatment section, the usage limit of the water purifier is shortened compared to the case where only the suspended matter is removed for the water not treated with the activated carbon. Membrane clogging is likely to occur early. Therefore, conventionally, there is known one in which purified water is stored and the stored purified water is back-flushed in the order of the membrane filtration section and the activated carbon filtration section to backwash the membrane (for example, JP-A-3-72990). Publication).

[0003]

However, in the case of the above-mentioned conventional technique, since the purified water is used as the washing water for backwashing, although the membrane filtration section is not contaminated by the backwashing, the washing that has passed through the membrane filtration section is performed. Since water flows back through the activated carbon filtration section, if the amount of water is small, the suspended solids and bacteria in the wash water will remain on the surface of the activated carbon, resulting in activated carbon contamination, that is, poor cleaning and water flow due to reuse. The residue is again captured by the membrane filtration unit, which causes the membrane to be clogged, and there is a drawback in that the membrane is clogged early despite the fact that cleaning is performed.
However, however, if the purified water reservoir is made large enough to secure a sufficient amount of purified water for backwashing, the whole becomes very large. An object of the present invention is to provide a water purifier that can surely perform backwashing of a membrane filtration unit for prolonging its service life without causing an increase in size.

[0004]

A feature of a water purifier according to the present invention is that a plurality of the water purification cartridges are provided and each of the water purification cartridges is supplied with washing water for backwashing the membrane to the membrane filtration section. A cleaning water inlet and a cleaning drainage outlet for discharging the cleaning drainage that has passed through the membrane filtration unit from the flow path between the activated carbon treatment unit and the membrane filtration unit are provided, and the plurality of water purification cartridges are divided into two groups. Separately, the cleaning drainage outlet of all the water purification cartridges is closed to supply raw water to the raw water inlet, and the cleaning drainage outlet of one group of the water purification cartridge is closed to supply the raw water to the raw water inlet. In addition to supplying the purified water, the raw water inlet of the water purification cartridge of the other group is closed and the purified water discharged from the water purification outlet of the water purification cartridge of the one group is supplied to the other group. The first backwash state in which the cleaning water inlet of the water purification cartridge is supplied, and the cleaning drainage outlet of the other group of the water purification cartridges is closed to supply the raw water to the raw water inlet, and the water purification cartridge of one group is also supplied. The raw water inlet is closed and the purified water discharged from the purified water outlet of the purified water cartridge of the other group is supplied to the clean water inlet of the purified water cartridge of the one group to the second backwash state. It is in the point provided.

[0005]

[Function] By switching the switching means to the first backwash state, the purified water cartridge of one group continuously purifies the raw water to generate purified water, and the continuously generated purified water is the purified water cartridge of the other group. Wash water inlet,
It is possible to backwash the membrane filtration section of the other group of water purification cartridges with purified water by flowing the membrane filtration section, the washing drainage outlet, and the order in which they are described, and by switching the switching means to the second backwashing state. While continuously purifying raw water with the water purification cartridge of the other group to generate purified water, the continuously generated purified water is used as the cleaning water inlet, the membrane filtration section, the cleaning drainage outlet of the water purification cartridge of the one group and the description thereof. The membrane filtration parts of the water purification cartridges of one of the groups can be backwashed with purified water by flowing in order, so that the membrane filtration parts of the water purification cartridges of either group can be backwashed without causing an increase in size. It is possible to secure a sufficient amount of washing water, and it is possible to reliably backwash the membrane filtration section with purified water. Moreover, since the washing water is not transferred to the activated carbon treatment section in the back washing of the membrane filtration section of the water purification cartridge of any group, the back washing does not contaminate the activated carbon treatment section. Of course, by switching the switching means to the purified water state, a sufficient amount of purified water can be produced using the water purification cartridges of both groups.

[0006]

According to the present invention, therefore, the membrane filtration portion can be reliably backwashed and the service life of the membrane filtration portion can be lengthened even though it is small, and the membrane filtration portion can be used for a long period of time. I can do it.

[0007]

EXAMPLE As shown in FIGS. 1 to 3, a water purifier comprises a main body 1 provided with a connecting portion 1a which can be connected to and separated from a faucet A such as a tap of a tap water, and a water purification cartridge which can be detachably attached to the main body 1. It consists of 2. The water purification cartridge 2 has a raw water inlet 3
The raw water inlet 3 is provided in a case 2A provided with a clean water outlet 4 and
Activated carbon treatment unit 5 for treating raw water flowing in from
A membrane filtration unit 6 for filtering the treated water from the activated carbon treatment unit 5 with a hollow fiber membrane and discharging it from the purified water outlet 4 is provided, and a flow between the activated carbon treatment unit 5 and the membrane filtration unit 6 is provided. A cleaning drain port 8 for draining from the passage 7 is provided. And two are provided. A raw water supply port 9 and a purified water which are respectively connected to the raw water inlet 3, the purified water outlet 4, and the cleaning drainage outlet 8 of the purified water cartridge 2 when the purified water cartridge 2 is attached to each of the purified water cartridge mounting portions of the main body 1A. An inlet 10 and a cleaning drainage inlet 11 are formed, and the main body 1A has a purified water outlet 12
And a cleaning drainage outlet 13 are formed, and a switching means is provided. As shown in FIG. 1, the switching means closes the cleaning / drainage outlets 8 of the two water purification cartridges 2 and supplies the raw water to the raw water inlet 3 in a purified water state,
As shown in FIG. 2, the cleaning drainage outlet 8 of the one water purification cartridge 2 is closed to supply raw water to the raw water inlet 3, and the raw water inlet 3 of the other water purification cartridge 2 is closed to close the one purified water. A first backwashing state in which purified water discharged from the purified water outlet 4 of the cartridge 2 is supplied to the cleaning water inlet 14 of the other purified water cartridge 2 and the cleaning drainage outlet 8 of the other purified water cartridge 2 as shown in FIG. The raw water inlet 3 of one of the water purification cartridges 2 and the purified water discharged from the water purification outlet 4 of the other water purification cartridge 2 of the one water purification cartridge 2 is closed. It is a means that can be switched to the second backwash state in which it is supplied to the wash water inlet 14. Specifically, of the raw water flow paths communicating with the connecting portion 1a, a water supply valve V1 for water purification that independently opens and closes each branch flow path L1 to the two raw water supply ports 9, and the two water purification receivers. An on-off valve V2 that opens and closes a merging flow path L2 that joins the receiving flow paths La connected to each of the inlets 10 and communicates with the purified water discharge port 12, and the cleaning drainage to the drainage channel L connected to the cleaning drainage discharge port 13. A drainage valve V3 that opens and closes a flow path L3 that joins and communicates the respective inlets 11 is provided. That is, it is configured as in the following [1] to [3]. [1] The water supply valve V1 and the opening / closing valve V2 for water purification of the two water purification cartridges 2 are opened, and the drainage valve V3 is closed, so that the water supply received from the water tap A to the connection portion 1a is supplied to the two water purification cartridges 2 The raw water supply port 9, the raw water inlet 3, the activated carbon treatment unit 5, the membrane filtration unit 6, the purified water outlet 4, the purified water receiving port 10, the receiving flow passage La, the confluent flow passage L2, and the purified water discharge port 12 and the order of flow for each of them. Let me
The two purified water cartridges 2 are used to supply purified water. [2] Water supply valve V1 for water purification for one water purification cartridge 2 and drain valve V3 for the other water purification cartridge 2
And closing the drainage valve V3 for one water purification cartridge 2 and the water supply valve V1 for water purification and the opening / closing valve V2 for the other water purification cartridge 2 while opening the valve, the water supply received from the water tap A to the connection portion 1a is Raw water supply port 9, raw water inlet 3, activated carbon treatment unit 5, membrane filtration unit 6, purified water outlet 4, purified water receiving port 1 for one of the purified water cartridges 2.
0, the receiving passage La, the receiving passage La for the other water purification cartridge 2, the purified water inlet 10, the purified water outlet 4, the membrane filtration unit 6, the cleaning drainage inlet 11, the cleaning drainage outlet 13, and flow in that order. The one water purification cartridge 2 is used to produce purified water, and the membrane filtration unit 6 of the other water purification cartridge 2 is backwashed with the purified water. [3] Water supply valve V1 for water purification for the other water purification cartridge 2 and drain valve V3 for one water purification cartridge 2
And closing the drainage valve V3 for the other water purification cartridge 2, the water purification water supply valve V1 for the one water purification cartridge 2 and the opening / closing valve V2, the water supply received from the water tap A to the connection portion 1a is Raw water supply port 9, raw water inlet 3, activated carbon treatment unit 5, membrane filtration unit 6, purified water outlet 4, purified water inlet 1 for the other purified water cartridge 2.
0, the receiving passage La, the receiving passage La for one of the water purification cartridges 2, the purified water inlet 10, the purified water outlet 4, the membrane filtration unit 6, the cleaning drainage inlet 11, the cleaning drainage outlet 13 and the flow in that order. The other water purification cartridge 2 is used to make purified water, and the membrane filtration unit 6 of the one water purification cartridge 2 is backwashed with the purified water. As described above, in this embodiment, the purified water outlet 4 is the cleaning water inlet 14, but the cleaning water inlet 14 may be provided separately. In addition, in the connection part 1a, the purified water / washing state in which the feed water from the feed tap A is supplied to the raw water flow path and the feed water from the feed tap A to the raw water discharge port 16 that discharges water as one thick flux are provided. A valve 18 is provided for switching between a raw water discharge state of supplying water and a raw water shower discharge state of supplying water from the water tap A to a raw water shower discharge port 17 for discharging water in a shower shape. In the above embodiment, two water purification cartridges 2 were provided and each one was made into each group, but the number of water purification cartridges 2 provided in each group is
It can be changed appropriately and may be different from each other.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram.

FIG. 2 is a schematic configuration diagram.

FIG. 3 is a schematic configuration diagram.

[Explanation of symbols]

 3 Raw water inlet 5 Activated carbon treatment part 4 Purified water outlet 6 Membrane filtration part 2 Purified water cartridge 14 Wash water inlet 7 Flow path 8 Wash drainage outlet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiichiro Miyata 17 Chudoji Minami-cho, Shimogyo-ku, Kyoto-shi, Kyoto Science Center Building Omron Life Science Institute Inc.

Claims (1)

[Claims] 1. An activated carbon treatment unit (5) for treating raw water flowing in from a raw water inlet (3) with activated carbon, and the treated water from the activated carbon treatment unit (5) is subjected to membrane filtration and discharged from a purified water outlet (4). A water purifier provided with a water purification cartridge (2) having a membrane filtration unit (6) for performing the membrane filtration, wherein each of the water purification cartridges (2) is provided with the membrane filtration (2). The washing water inlet (14) for supplying the washing water for membrane backwashing to the section (6) and the washing wastewater that has permeated the membrane filtering section (6) are treated with the activated carbon treatment section (5).
A cleaning drain outlet (8) for discharging from the flow path (7) between the membrane and the membrane filtration part (6) is provided, and the plurality of water purification cartridges (2) are divided into two groups, and all the water purification is performed. The cleaning drainage outlet (8) of the cartridge (2) is closed to supply the raw water to the raw water inlet (3), and the cleaning drainage outlet (8) of one group of the water purification cartridge (2) is The raw water inlet (3) is closed to supply raw water, and the raw water inlet (3) of the water purification cartridge (2) of the other group is closed to clean water outlet (4) of the water purification cartridge (2) of the one group. ), The first backwashing state in which purified water discharged from the water purification cartridge is supplied to the cleaning water inlet (14) of the water purification cartridge (2) of the other group, and the cleaning drainage outlet of the other group of the water purification cartridges (2) ( 8) closed From the purified water outlet (4) of the water purification cartridge (2) of the other group by closing the raw water inlet (3) of the purification water cartridge (2) of one group while supplying the raw water to the raw water inlet (3) of the other group. A water purifier provided with a switching means that can be switched to a second backwash state in which the purified water discharged is supplied to the cleaning water inlet (14) of the water purification cartridge (2) of one group.