JPH09155343A - Water purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make safe and palatable drinking water from raw water over a long period of time by providing two or more first water purifying tanks packed with a chloride ion type strong basic anion exchange resin and providing a second water purifying tank packed with activated carbon and hollow yarn membranes purifying primary filtered water. SOLUTION: Raw water is passed through a first water purifying tank 1a packed with an anion exchange resin by a raw water supply control mechanism 7. Next, the primary filtered water issued from the first water purifying tank 1a is passed through a second water purifying tank 2 from a primary filtered water supply control mechanism 9 to be emitted from a purified water emitting port 13. At that time, when the life of the anion exchange resin of the first water purifying tank 1a is detected on the basis of an integrated flow rate by a liquid flow sensor 5, the supply of water to the first water purifying tank 1a is stopped by the raw water supply control mechanism 7 and the supply of water is changed over to a first water purifying tank 1b and a sodium chloride aq. soln. is supplied to the first water purifying tank 1a from a sodium chloride dissolving tank 10 by a regeneration soln. supply mechanism 8 to simultaneously perform the regeneration of the anion exchange resin of the first water purifying tank 1a.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water purifier for purifying water for drinking.

[0002]

2. Description of the Related Art Due to the spread of water supply, most drinking water is
Although tap water is used, well water is also used due to undeveloped water supply or preference. However, some well water does not meet the water quality standards for drinking water, and in particular, the items of nitrate nitrogen and nitrite nitrogen and the items of bacteria such as coliform bacteria and general bacteria often exceed the standards. In addition, well water often causes problems in terms of water quality in terms of odor and chromaticity.

Among the pollutants in well water, bacteria are produced by membrane filtration with a porous hollow fiber membrane, and odor and chromaticity components are
Since it can be removed by activated carbon, a water purifier that uses a porous hollow fiber membrane or activated carbon alone or in combination as a filter medium is also applicable to the purification of well water, but nitric nitrogen and nitrite nitrogen are A water purifier using an anion exchange resin, which is not removed by such a filter medium and is effective for removing nitrate nitrogen and nitrite nitrogen, as a filter medium is also under study.

When an anion exchange resin is used as a filter medium for a water purifier, the anion exchange resin removes nitrate nitrogen and nitrite nitrogen by ion exchange, but a limited amount of anion exchange resin filled in the water purifier is used. In terms of quantity, the ion-exchange groups saturate in a relatively short period of time and reach the end of their lives, requiring frequent exchange and regeneration of the anion-exchange resin.

[0005]

The object of the present invention is to effectively use an anion exchange resin having a short life as a filter medium, and to obtain safe and delicious drinking water from raw water such as well water containing nitrate nitrogen and nitrite nitrogen for a long period of time. It is to provide a water purifier to obtain.

[0006]

The present invention comprises two or more first water purification tanks filled with a chloride ion type strongly basic anion exchange resin and activated carbon for purifying primary filtered water from the first water purification tank. And a second water purification tank filled with a hollow fiber membrane, and a raw water supply control mechanism for stopping the water passage to the other first water purification tank when the raw water is passed to one first water purification tank, and a water passage stop state In the first water purification tank, the regeneration liquid supply mechanism that supplies an aqueous sodium chloride solution when regenerating the anion exchange resin, and only the primary filtered water from the first water purification tank that supplies water are selected and supplied to the second water purification tank. It is a water purifier characterized by being provided with a primary filtered water supply control mechanism for discharging the recycled waste liquid of the first water purification tank whose water is stopped.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The water purifier of the present invention comprises a first water purification tank filled with a chloride ion type strongly basic anion exchange resin and a second water purification tank filled with activated carbon and a hollow fiber membrane. One water purification tank is composed of two or more tanks each filled with a chloride ion type strongly basic anion exchange resin.

The anion exchange resin filled in the first water purification tank is for removing nitrate nitrogen and nitrite nitrogen in raw water by ion exchange, and is a chloride ion type reproducible with sodium chloride, A strongly basic anion exchange resin that is not affected by the pH of

The activated carbon filled in the second water purifying tank removes odors, chromaticity components and other organic substances in the raw water,
Natural product type activated carbon such as coconut shell activated carbon, bone charcoal, charcoal, pitch, petroleum coke, synthetic activated carbon from burned material of resin or rubber, etc. are used, and activation of activated carbon may be performed by steam activation, chemical activation or any other method. The shape may be any of powder, granules, fibers, and the like. Granular coconut husk activated carbon is preferably used, and activated carbon to which silver is impregnated to impart antibacterial properties is also preferably used.

The hollow fiber membrane filled in the second water purification tank is for removing bacteria such as Escherichia coli and general bacteria in raw water and other minute substances, and is composed of cellulose, polyolefin, polysulfone, A porous hollow fiber membrane made of a polymeric substance such as polyvinyl alcohol or polymethyl methacrylate is used, and a porous hollow fiber membrane hydrophilized with an ethylene-vinyl alcohol copolymer or the like is preferably used.

In the water purifier of the present invention, a raw water supply control mechanism, a regenerated liquid supply mechanism, and a primary filtered water supply control mechanism are provided.

The raw water supply control mechanism has a function of stopping the passage of water to the other first water purification tank when the raw water is passed to one first water purification tank. Loss of ion exchange capacity of resin (life)
By the detection of the above, the switching from the first water purifying tank, which has been passing water until now, to the first water purifying tank containing another usable anion exchange resin is performed manually or automatically.

The regenerating liquid supply mechanism is a first recirculating liquid supply mechanism in which the passage of the aqueous sodium chloride solution is stopped when the anion exchange resin is regenerated.
The first water purification tank that has a function of supplying water to the water purification tank, is composed of a switching valve, and is in a stopped state of automatically passing sodium chloride aqueous solution either manually or in conjunction with switching the raw water by the raw water supply control mechanism. Supply to. Regeneration of the anion exchange resin is carried out by releasing the nitrate nitrogen and nitrite nitrogen adsorbed on the anion exchange resin from the ion exchange group by the supplied sodium chloride aqueous solution, and the sodium chloride aqueous solution is supplied by the anion exchange resin. It is controlled by the flow rate control unit that is set based on the ion exchange capacity and sodium chloride amount of the resin, and after the regeneration of the anion exchange resin is completed,
The supply of the aqueous sodium chloride solution is stopped.

Further, the regenerant supply mechanism is provided with a sodium chloride dissolving tank for producing an aqueous sodium chloride solution used for regenerating the anion exchange resin of the first water purifying tank in a state where water flow is stopped, and part of the raw water is diverted. Although it may be connected to a sodium chloride dissolution tank that dissolves sodium chloride that has been input using this divided water, by using the divided water from the primary filtered water supplied from the first water purification tank to the second water purification tank It is preferably connected to a sodium chloride dissolving tank for dissolving sodium chloride. Further, this regenerant supply mechanism also functions as a wash water supply mechanism when used in a state where sodium chloride is not present. As sodium chloride, sodium chloride is preferably used because it is easily available, safe, and highly soluble.

The primary filtered water supply control mechanism is the first
It has a function of selecting only the primary filtered water from the water purification tank and supplying it to the second water purification tank, and discharging the regenerated waste liquid of the first water purification tank whose water flow is stopped. In response to the switching of raw water and the supply of the aqueous sodium chloride solution by the regeneration liquid supply mechanism, the primary filtration water is automatically supplied to the second water purification tank and the regeneration waste liquid is discharged to the outside of the water purifier in association with the manual operation.

In the water purifier of the present invention, a flow sensor and a constant flow valve are provided in the flow path from the raw water inlet to the second water tank. The flow rate sensor detects the accumulated flow rate and detects the life of the anion exchange resin based on the predetermined accumulated flow rate. It detects the life of the anion exchange resin when maintaining the quality of purified water to a certain standard. The constant flow valve functions as a means, and functions as a purification stabilizing means that keeps the flow rate constant and performs stable purification.

Further, in response to the detection signal from the flow rate sensor, the raw water supply control mechanism stops the passage of the raw water to the first water purifying tank which has been so far passed, and the first purified water containing another usable anion exchange resin. It is preferable that the life of the anion exchange resin in the first water purification tank during water passage is displayed in advance while switching to the passage of raw water to the tank, and the arrival of the regeneration time of the anion exchange resin is lit up. It is preferable that the water purifier be provided with a display portion that informs by voice or the like.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram of an example of the water purifier of the present invention, and FIG. 2 is a block diagram of another example of the water purifier of the present invention. In the figure, 1 is a first water purification tank, 1a is a first water purification tank, 1b is a first water purification tank, 2 is a second water purification tank, 3 is a raw water inlet, 4 is a diversion / flow controller, 5 is a liquid flow sensor. , 6 is a constant flow valve, 7
Is a raw water supply control mechanism, 8 is a regenerant supply mechanism, 9 is a primary filtered water supply control mechanism, 10 is a sodium chloride dissolution tank, 11
Is a flow dividing section, 12 is a flow rate control section, 13 is a purified water discharge port, and 14 is
Indicates a recycled waste liquid discharge port.

In FIG. 1, raw water is supplied from a raw water inlet 3, passes through a liquid flow sensor 5 and a constant flow valve 6 provided in a flow path, and a raw water supply control mechanism 7 controls a first water purification tank 1a filled with an anion exchange resin. Is passed to. The primary filtered water from the first water purification tank 1a is secondarily filled with activated carbon and hollow fiber membranes by the primary filtered water supply control mechanism 9 which works in conjunction with the raw water supply control mechanism 7.
Water is passed through the water purification tank 2, and the purified water from the second water purification tank 2 is discharged from the purified water outlet 13. When the life of the anion exchange resin of the first water purification tank 1a is detected by the integrated flow rate of the liquid flow sensor 5, the raw water supply control mechanism 7 stops the water flow to the first water purification tank 1a and the first water purification tank 1a. The primary filtered water from the first purified water tank 1b is switched to the water flowing to the first purified water tank 1b, and is passed to the second purified water tank 2 by the primary filtered water supply control mechanism 9 which works in conjunction with the raw water supply control mechanism 7.

On the other hand, the sodium chloride aqueous solution is supplied by the regenerant supply mechanism 8 to the first water purifying tank 1 containing the anion exchange resin, which is required to be regenerated and whose water flow is stopped. The regenerant liquid supply mechanism 8 is a sodium chloride dissolving tank 10 that is a branched water from the primary filtered water supplied from the first purified water tank to the second purified water tank.
Connected to

The aqueous solution of sodium chloride is divided by the flow dividing section 11 provided in the flow path of the primary filtered water supplied from the primary filtered water supply control mechanism 9 to the second purified water tank 2 to the primary filtered water which has passed through the flow rate control section 12. It is generated in the sodium chloride dissolving tank 10 with the added sodium chloride. Further, the split-flow primary filtered water is supplied to the first water purification tank 1 as washing water after being regenerated as it is without the presence of sodium chloride. The amount of primary filtered water and the amount of sodium chloride are preferably only those required for regeneration and washing, and are set by the flow rate controller 12 and the input amount. The recycled waste liquid of the anion exchange resin and the cleaning water in the first water purification tank 1 are discharged from the recycled waste liquid discharge port 14 to the outside of the water purifier by the primary filtered water supply control mechanism 9.

FIG. 1 shows a state in which an aqueous sodium chloride solution is supplied to the first water purification tank 1b to regenerate the raw water when the raw water is passed to the first water purification tank 1a. The purification in the tank and the regeneration of the anion exchange resin in the first water purification tank can be performed at the same time.

In FIG. 2, the regenerant supply mechanism 8 for supplying the aqueous sodium chloride solution to the first water purification tank 1 containing anion exchange resin that requires regeneration is a flow path for the raw water supplied to the first water purification tank 1. It is connected to a sodium chloride dissolving tank 10 for raw water divided by the diversion / flow rate control unit 4 provided in.

In FIG. 1 or 2, raw water supply control mechanism 7, reclaimed liquid supply mechanism 8 and primary filtered water supply control mechanism 9
Are each composed of a switching valve, and the respective mechanisms are interlocked with each other and operate integrally either manually or for automation using a solenoid valve or the like.

[0025]

EFFECTS OF THE INVENTION According to the water purifier of the present invention, by providing a plurality of anion exchange resin filling tanks having a short life as a filter medium, the function and regeneration of the anion exchange resin can be performed and the anion exchange resin is effectively used. , It is possible to obtain safe and delicious drinking water from raw water such as well water containing nitrate nitrogen and nitrite nitrogen for a long period of time, and the water purifier of the present invention is
It is also economically advantageous.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example of a water purifier of the present invention.

FIG. 2 is a configuration diagram of another example of the water purifier of the present invention.

[Explanation of symbols]

 1 1st water purification tank 1a 1st water purification tank 1b 1st water purification tank 2 2nd water purification tank 3 Raw water inflow port 4 Dividing / flow rate control unit 5 Liquid flow sensor 6 Constant flow valve 7 Raw water supply control mechanism 8 Regeneration liquid supply mechanism 9 Primary Filtered water supply control mechanism 10 Sodium chloride dissolution tank 11 Flow dividing section 12 Flow rate control section 13 Purified water spouting port 14 Recycled waste liquid discharge port

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Nishi Atsuko 2-3-19 Kyobashi, Chuo-ku, Tokyo Inside Mitsubishi Rayon Co., Ltd.

Claims (3)

[Claims] 1. At least two first water purification tanks filled with a chloride ion type strongly basic anion exchange resin are provided.
It is equipped with a second water purification tank filled with activated carbon and hollow fiber membranes that purifies the primary filtered water from the water purification tank, and stops the passage of water to the other first water purification tank when the raw water is passed to one first water purification tank. A raw water supply control mechanism for controlling, a regeneration liquid supply mechanism for supplying an aqueous sodium chloride solution at the time of regenerating the anion exchange resin of the first water purification tank in a water supply stopped state, and only the primary filtered water from the first water purification tank for water passage. A water purifier characterized by comprising a primary filtered water supply control mechanism for selecting and supplying the second waste water to the second water tank and discharging the recycled waste liquid of the first water tank whose water supply is stopped. 2. The water purifier according to claim 1, wherein the regeneration liquid supply mechanism includes a sodium chloride dissolving tank that uses the primary filtered water from the first water purifying tank. 3. The water purifier according to claim 1 or 2, wherein a flow sensor and a constant flow valve are provided in a flow path from the raw water inlet to the second water purification tank.