JP2002224670A - Apparatus for treating water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To wash a filter medium in a filter for filtering raw water by making the purified water stored in a purified-water pressurizing tank flow backward into the filter for removing contaminants in the filter. SOLUTION: This water treating apparatus is constituted so that a plurality of valves 16, 28 are arranged on a raw water W supplying side and an outlet side of the filter 18 respectively and the purified water filtered by the filter 18 is made to flow through a conduit 32 or flow backward through a normal flow conduit for using the purified water by changing over the valves 16, 28 selectively so as to backwash the filter 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating water, and more particularly, to purifying tap water, that is, tap water, various industrial waters, domestic wastewater and industrial wastewater (hereinafter referred to as "raw water"). Water treatment method and water treatment apparatus for the same.

[0002]

2. Description of the Related Art In order to remove contaminants, bacteria, and other organic substances contained in raw water and purify them, it has conventionally been common to use a hollow fiber membrane or other filtration membrane as a filter medium. Is being done.

[0003] In this prior art, a common problem is:
Contaminants that pass through the filter media during the raw water filtration process will cause the filter media to become clogged and the efficiency of treating the raw water will gradually decrease.

In order to eliminate such an obstacle, Japanese Patent Application Laid-Open No. 9-29238 discloses that raw water is guided to the lower end of a filter containing a filter medium for filtering raw water, and the raw water is passed through the filter from the lower end to the upper end. And purify the purified water stored in the pressure accumulator, and pressurize the purified water stored in the pressure accumulator to flow back to the filter as needed to remove contamination of the filter medium. Water purifier ".

Japanese Patent Laid-Open Publication No. Hei 10-156358 discloses that a raw water flowing into a membrane immersion tank is separated into a solid and a liquid by an immersion type filter device immersed in the tank, and treated water that has passed through the filtration membrane is supplied to a feed tank. The present invention discloses a method of backwashing a water supply apparatus which does not require a separate power source particularly at the time of supplying water and at the time of backwashing, and a water supply apparatus which feeds the water to a supply pipe system via a water supply system.

[0006]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. Hei 9-292
The water purification device described in Japanese Patent Publication No. 38 is an extremely effective device particularly as a device having a small capacity, but when the scale is large, there is a possibility that purified water to be backwashed may be insufficient.

The one disclosed in Japanese Patent Application Laid-Open No. 10-156358 is also not suitable for filtering a large amount of raw water because the internal pressure in the treated water tank does not exceed the discharge pressure of the suction pump. There is a problem.

In view of the above problems, a main object of the present invention is to store purified water used for backwashing in a purified water pressurized tank and apply compressed air to the water in the tank to increase the pressure. It is an object of the present invention to provide a water treatment apparatus in which the purified water is returned to a filter to wash a filter medium in the filter.

It is a further object of the present invention to provide a water treatment apparatus capable of washing a filter medium of a contaminated filter without interrupting filtration of raw water by the filter.

Another object of the present invention is to provide a water treatment apparatus which can purify raw water and wash a filter medium of a filter by automatically switching a plurality of valve devices.

[0011]

According to the present invention, there is provided, in accordance with the present invention, a conduit for supplying raw water to a filter containing filter media by a water supply pump for purifying the raw water. A valve is provided, and the first two-way valve is selectively switched to connect a conduit for supplying raw water to a filter or to connect the filter to a drain pipe, and a second is provided at an output side of the filter. A two-way valve is provided so that purified water purified by the filter is sent to a conduit for use, and the first two-way valve is switched to stop supply of raw water to the filter, and the filter is turned off. Connected to the drain pipe via the first two-way valve, and at the same time, switched the second two-way valve to allow the purified water filtered by the filter to flow into the purified water pressurized tank, Connect a conduit equipped with a third two-way valve to purify the purified water pressurized tank. When water is supplied, the third two-way valve is operated to connect the purified water pressurized tank to the exhaust pipe, and after the purified water is stored in the purified water pressurized tank, the third two-way valve is operated. To cut off the communication between the purified water pressurized tank and its exhaust pipe, connect the purified water pressurized tank to the compressed air supply pipe having an air compressor, and return the purified water stored in the purified water pressurized tank to the filter. The filter medium is washed, and the washing water obtained by backwashing the filter is guided to the drain pipe through the first two-way valve, so that the water that efficiently purifies the raw water and backwashes the filter is efficiently used. A processing device is provided.

[0012]

First Embodiment A preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic system diagram showing a water treatment apparatus 10 according to a first embodiment of the present invention. The raw water W is supplied to the water supply conduit 14 by operating the raw water supply pump 12.
Sent to. The water supply conduit 14 is provided with a two-way valve 16 which is selectively operated to connect the water supply conduit 14 to a conduit 20 connecting to the lower end of the filter 18 or to a drain pipe 22. I do.

The filter 18 contains a filter medium 24 known per se, such as a hollow fiber membrane. Connected to the upper end of the filter 18 is a filtered purified water conduit 26 which is connected by a two-way valve 28 to a purified water conduit 32 equipped with a cock 30 or is connected to a purified water pressurized tank. Connects to conduit 36 which connects to.

In order to use the purified water filtered by the filter 18, the two-way valve 28 is operated to connect the conduit 26 to the two-way valve 2.
Via 8 a conduit 32 having a cock 30 is connected. On the other hand, when the two-way valve 28 is switched, the purified water that has been filtered through the filter 18 is connected to the purified water pressurized tank 34 via the conduit 26, the two-way valve 28, and the conduit 36. If necessary, a suitable pressure gauge 38 or a liquid level sensor can be attached to the purified water pressurized tank 34.

When water is stored in the purified water pressurized tank 34, the tank 3
A conduit 40 is connected to the upper end of the tank 34 for discharging the air in the tank 4 to the outside.
Is provided, and by switching this valve 42,
The conduit 40 is connected to the exhaust pipe 44 or the blow pipe 46.

When purified water is stored to a predetermined water level in the purified water pressurizing tank 34, the apparatus 10 of this embodiment uses compressed air to pressurize the purified water. For this purpose, an air compressor 48 is arranged on the upstream side of the blower pipe 46, and the two-way valve 42 is switched to disconnect the conduit 40 from the exhaust pipe 44 and connect the conduit 40 to the blower pipe 46. The air pressurized by the air compressor 48 is supplied to the purified water pressurized tank 34 through the blower pipe 46, the two-way valve 42, and the conduit 40, and pressurizes the purified water inside. It is preferable to provide an air filter 50 in the blower tube 46 in order to remove contaminants in the supplied air. In addition, the raw water supply pump 12, the two-way valves 16, 28, 42,
The operation of the air compressor 48 and the like is automatically controlled by a computer.

The water treatment apparatus 1 according to the first embodiment of the present invention
0 is constructed as described above, so that the two-way valve 16 is first operated to a position where the water supply conduit 14 and the conduit 20 communicate, and the two-way valve 28 is turned on from the filter 18. Activating conduit 26 in position to communicate with conduit 32,
The raw water supply pump 12 is operated. By doing so, the raw water W passes through the filter medium 24 disposed inside the filter 18, and the filtered purified water passes through the conduit 26 and the two-way valve 2.
It reaches the cock 30 via the pipe 8 and the conduit 32 and is used by operating it.

If the filter 18 is used for a long period of time, the filter medium 24 is contaminated by the suspended matter contained in the raw water W passing therethrough, causing clogging and the like, and its purification ability is reduced. Therefore, the two-way valve 28 is switched when necessary, and the conduit 26 on the output side of the filter 18 and the purified water pressurized tank 3
4 and communicates with a conduit 36 connected to it.

As described above, if the supply of the raw water W to the filter 18 by the pump 12 is continued,
The purified water filtered through 8 is passed through conduit 26 to conduit 36
Flows into the pressurized water pressurized tank 34 via the pipe 40, and the air in the tank 34 is discharged from the conduit 40 to the outside through the two-way valve 42 and the exhaust pipe 44. When the purified water flows into the purified water pressurized tank 34 to a predetermined position, it can be known by an instruction from the pressure gauge 38 or a water level sensor known per se.

Then, the operation of the raw water supply pump 12 is stopped, the two-way valve 16 is switched, and the conduit 20 and the drainage pipe 22 are connected to each other. 36, the two-way valve 28, and the conduit 26, the gas flows back into the filter 18 in a reverse direction, and the filter medium 24 in the filter 18 is backwashed from the upper end to the lower end, and contaminants adhering to the filter medium 24 are removed. And the washing water carrying the contaminants is discharged from the end of the drain pipe 22 to the outside through the conduit 20, and the filter medium 24 in the filter 18 is returned to a fresh state.

[0021]

Second Embodiment In the present invention, as shown in FIG. 2, a plurality of, for example, two filters 18A and 18
B are arranged in parallel, and the raw water W is supplied to the plurality of filters 18 through the two-way valve 16 by operating the raw water supply pump 12.
A and 18B are sent by conduit 20 to the lower ends thereof, respectively.
The conduit 26 extending from the upper end of the filter and the upper end of the filter communicates with the two-way valve 28, and the other components are exactly the same as those of the water treatment apparatus 10 shown in FIG. In this modification, raw water is simultaneously purified by a plurality of filters 18B and the like connected in parallel at the same time, and backwashing of the filters 18A and 18B is performed simultaneously.

[0022]

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG. Water treatment device 1 of third embodiment
Reference numeral 10 is very similar to the device 10 of the first embodiment. The main difference is that the first filter 18 and the second filter 118 are arranged in parallel. With this configuration, when the first filter 18 purifies the raw water and uses this purified water for use, it is stored in the single purified water pressurized tank 34 already stored and pressurized. The purified water is returned to the second filter 118 to wash the filter medium 124 housed therein, and the second filter 118 purifies the raw water and uses this purified water for use. , So as to wash the filter medium 24 of the first filter 18,
An object of the present invention is to provide a water treatment apparatus which alternately purifies raw water and cleans a filter without interrupting operation.

For the sake of simplicity, the same components of the device 110 of the third embodiment as those of the device 10 of the first embodiment will be described using the same reference numerals used for each component. I do.

In the water treatment apparatus 110, the raw water W is supplied to the first filter 1 by operating the raw water supply pump 12.
8 and a conduit 114 on the second filter 118 side.
And sent to. Conduit 14 is provided with a first two-way valve 16 which is selectively actuated to connect conduit 14 to conduit 20 connecting the lower end of filter 18 or to drain conduit 20. A second two-way valve 116 is also provided on the conduit 114 for connection to the conduit 22, which is selectively activated to connect the conduit 114 to the lower end of the second filter 118. Or the conduit 120 is connected to the drain pipe 22.

Even when the raw water W is supplied to the first filter 18 and filtered, the second two-way valve 116 is connected to the conduit 1.
It has been activated to maintain communication between 14 and conduit 120.
Then, the third two-way valve 28 provided on the conduit 26 on the output side of the first filter 18 is switched, and the conduit 26 is connected to the third two-way valve 2.
8 through conduit 32 and valve 130 to stop cock 3
0, and the purified water filtered by the first filter 18 is used.

On the other hand, the purified water filtered by the second filter 118 operates the fourth two-way valve 128 provided on the conduit 126 on the output side of the second filter 118 to connect the conduit 126 to the fourth filter. Conduit 13 communicating with the purified water pressurized tank 34 via the one-way valve 128
Contact 6. Thereby, the device 1 of the first embodiment
As described in detail with respect to 0, purified water from the second filter 118 is sent to the purified water pressurized tank 34 and can be stored.

Similarly to the description of the apparatus of the first embodiment, in the water treatment apparatus 110 of the second embodiment, the two-way valve 28 is switched at a required time to switch the two-way valve 28 from the first filter 18. The conduit 26 communicates with the conduit 36 connecting to the purified water pressurized tank 34, and the fourth two-way valve 128 is operated to connect the conduit 126 on the output side of the second filter 118 to the purified water pressurized tank 3.
And disconnects conduit 136 in communication with conduit 126
Is communicated with a conduit 132 which communicates with the cock 30. At the same time, the first two-way valve 16 is switched, and the conduit 20 connecting the conduit 14 and the lower end of the first filter 18 is connected to the drain pipe 2.
2 is communicated.

As described above, when the supply of the raw water W to the second filter 18 by the pump 12 is continued and the supply of water to the first filter 18 is interrupted, the purified water pressurized tank 3
4 flows into the first filter 18 via the conduit 36, the third two-way valve 28, and the conduit 26, and cleans the filter medium 24 of the first filter 18, and the waste water is discharged through the conduit 20, through the first two-way valve 16, is discharged to the outside from the drain pipe 22. During this time, the purified water filtered in the second filter 118 is supplied to the conduit 126, the fourth two-way valve 128, the conduit 132,
It is provided for use via valve 130.

Next, when cleaning the filter medium 124 of the second filter 118, the first valve 16 is switched so that the raw water flows into the first filter 18, and the third two-way valve 28 is Switch to disconnect conduit 26 and conduit 36 at the output of first filter 18 so that conduit 26 communicates with conduit 32, while simultaneously switching second two-way valve 116 to connect conduit 26 The communication between the conduit 114 and the conduit 120 is cut off, the conduit 120 is communicated with the drain 22, and the fourth two-way valve 128 is disconnected.
To disconnect the conduit 126 and the conduit 132,
Conduit 126 communicates with conduit 136.

By switching the two-way valves as described above, the water in the purified water pressurization tank 34 flows back into the second filter 118 to wash the filter medium 124, and the sewage is removed from the conduit 120, Drain pipe 2 through second two-way valve 116
2 can be released to the outside.

In the water treatment apparatus 110 of the third embodiment, the raw water pump 12 is not stopped and the raw water W is supplied to the conduit 11 even during the backwashing of the first filter 18.
4 and a conduit 120 to a second filter 118 which is filtered and ready for use, so that the second filter 118 is not interrupted during the backwashing of the first filter 18, but is stopped. Purified water can be supplied from the vessel 118.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram showing a water treatment apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic system diagram showing a water treatment apparatus according to a second embodiment of the present invention.

FIG. 3 is a schematic system diagram showing a water treatment apparatus according to a third embodiment of the present invention.

[Explanation of symbols]

W Raw water 10, 110 Water treatment device 12 Water supply pump 14, 114 Water supply conduit 16, 28, 42, 116, 128, 130 Two-way valve 18 Filter 20, 20, 32, 36, 40, 46, 120, 12
6,132 136 Conduit 22 Drainage pipe 24 Filter medium 30 Cock 34 Purified water pressurized tank 44 Exhaust pipe 46 Blast pipe 48 Air compressor 50 Air filter

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshiro Murasawa 2-3-8 Akebono, Higashi-ku, Hiroshima-shi, Hiroshima F-term in Hiromite Co., Ltd. 4D006 GA02 HA93 JA53Z JA55A JA63Z JA67Z KA63 KC03 PB05 PB06 PB08

Claims (4)

[Claims] 1. A first two-way valve is provided in a conduit for supplying raw water to a filter containing filter media by a water supply pump for purifying raw water, and said first two-way valve is selectively switched to switch said first two-way valve. A conduit for supplying raw water is connected to the filter, or the filter is connected to a drain pipe, and a second two-way valve is provided in a conduit on the output side of the filter to perform the filtration. The purified water purified by the filter is sent to a conduit for use, and the first two-way valve is switched to stop supplying raw water to the filter, and the filter is moved to the first filter. Connecting to a drain pipe via a two-way valve, and simultaneously switching the second two-way valve so that the purified water filtered by the filter flows into the purified water pressurizing tank; and Connect a conduit with a third two-way valve to the top of the pressure tank Operating the third two-way valve to connect the purified water pressurized tank to an exhaust pipe when purified water is supplied to the purified water pressurized tank; After the is stored, the third two-way valve is operated to cut off the communication between the purified water pressurized tank and the exhaust pipe, and connect the purified water pressurized tank to the compressed air supply pipe having an air compressor. In this way, the purified water stored in the tank is returned to the filter to wash the filter medium, and the washing water obtained by backwashing the filter is guided to a drain pipe through a first two-way valve. A water treatment apparatus, comprising: 2. A plurality of filters accommodating the filter media are connected in parallel, and raw water is simultaneously supplied to the plurality of filters via the first two-way valve. Each conduit on the output side is connected to one conduit before reaching the second two-way valve, and the raw water is simultaneously filtered by the plurality of filters, and the plurality of filters are simultaneously backwashed. The water treatment device according to claim 1, wherein 3. The water treatment apparatus according to claim 1, wherein an air filter is provided in the compressed air supply conduit. 4. A first conduit for supplying raw water to a first filter containing a filter medium by a water supply pump is provided with a first two-way valve, and said first two-way valve is selectively switched to switch said first two-way valve. A first supply conduit is connected to the first filter, or the first filter is connected to a drain pipe, and a second filter that contains a filter medium by the water supply pump is provided. A second conduit for supplying raw water is provided with a second two-way valve, and the second two-way valve is selectively switched to connect the second supply conduit to the second filter, or The second filter is connected to the drain pipe, and a third two-way valve is provided on an output side of the first filter, and purified water purified by the first filter is provided. To a conduit for service or to a pressurized water tank. A fourth two-way valve is provided at the output side of the second filter to connect the purified water purified by the second filter to a conduit for use or to connect to a purified water pressurized tank. And connecting a conduit having a fifth two-way valve to the upper end of the purified water pressurized tank, and operating the fifth two-way valve when purified water is supplied to the purified water pressurized tank. The purified water pressurized tank is communicated with an exhaust pipe, and after the purified water is stored in the purified water pressurized tank, the fifth two-way valve is operated, and the purified water pressurized tank and the The communication with the exhaust pipe is cut off, the purified water pressurized tank is connected to a compressed air supply pipe having an air compressor, and the purified water stored in the purified water pressurized tank is filtered by the first filter or the second filter. Back through the first filter or the second filter. The washed washing water is led to the drain pipe through the first two-way valve or the second two-way valve, and without interrupting the raw water filtration operation of the first and second filters, A water treatment apparatus capable of performing backwashing of a filter.