JPH08318264A - Water purifier - Google Patents

Abstract

PURPOSE: To provide a water purifier enhanced in the removing capacity of an ionic substance by using an activated carbon electrode and capable of reactivating the removing capacity. CONSTITUTION: A water purifier has a voltage applying type water purifying part 4 substantially removing an ionic substance, a power supply 3 for applying voltage to the water purifying part 4 and an activated carbon filter type water purifying part 2 substantially removing meltable org. matter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification device which achieves high efficiency and long life.

[0002]

2. Description of the Related Art Activated carbon has a high adsorption capacity and is widely used for water purification in water treatment, sugar refining industry and the like.

For household use, it is used for deodorizing drinking water and removing descaling in water purification jar pots, water purifiers, etc.
With the increasing interest in water at present, the penetration rate of products with water purification functions is increasing.

Activated carbon is used in the form of powder or particles,
Water purification is carried out by a method of mixing raw water with activated carbon and then filtering, a method of mixing activated carbon with fibers and the like, shaping the mixture, and passing the raw water.

According to this method, the ability to remove fusible organic substances is extremely high, and the ability to remove colored components and foaming components is also high.

[0006]

However, in the conventional methods, the ability to remove ionic substances is lower than that of fusible organic substances, and if performance deterioration occurs, activated carbon itself must be replaced.

In view of the above problems of the prior art, the present invention enhances the ability to remove ionic substances, and the ability to remove ionic substances can be periodically reactivated, and the replacement period is also changed. An object of the present invention is to provide a purifying device that can be lengthened.

[0008]

Means for Solving the Problems The present invention is to achieve the above-mentioned object, and is for applying a voltage to the voltage-applied water purification unit that substantially removes ionic substances and the voltage-applied water purification unit. A water purification device having a power supply.

The present invention also provides a voltage-applying water purification unit for substantially removing ionic substances, a power source for applying a voltage to the voltage-applying water purification unit, and activated carbon filtration for substantially removing fusible organic substances. It is a water purifier characterized by having a model water purifier.

Further, the voltage application type water purifying unit has two electrodes containing at least activated carbon, and by applying a voltage to both of them, an ionic substance can be electrostatically adsorbed to the activated carbon electrodes. Is.

Further, the voltage application type water purifying section is a water purifying apparatus capable of reactivating the water purifying ability by removing the ionic substances adsorbed on the electrodes by arbitrarily changing the voltage and polarity applied to the electrodes. .

[0012]

In the present invention, for example, activated carbon and a binder are mixed and shaped, and an ionic substance is electrostatically adsorbed and removed by applying a voltage in raw water.

If the ability to remove ionic substances deteriorates, the voltage applied between the activated carbon electrodes is changed to dissociate the adsorbed ionic substances from the surface of the electrodes and reactivate the ability to remove them. As a result, it is possible to achieve a long-life water purifier with a high ability to remove ionic substances.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic view of a water purifier in one embodiment of the present invention. Reference numeral 1 is a raw water inlet, 2 is an activated carbon filtration type water purification unit, 3 is a power source, 4 is a voltage application type water purification unit, and 5 is a purified water extraction port.

The voltage application type water purification unit 4 has two activated carbon electrodes 41 and 42. As the activated carbon electrodes 41 and 42, a powder prepared by mixing a phenol-based activated carbon powder having a particle diameter of 5 μm and a phenol resin as a binder in a weight ratio of 7: 3 was prepared, and a pressing pressure of 120 kg /
It was formed under the conditions of cm ² and a press temperature of 180 ° C. and heated at 800 ° C. in a nitrogen gas atmosphere to form an electrode body.

The activated carbon filtration type water purification unit 2 has a particle size of 5
Phenolic activated carbon powder of μm, carboxymethyl cellulose as a binder, and water in a weight ratio of 8: 2:
It was mixed at a ratio of 3 and dried, and this was used as granular activated carbon having a diameter of about 5 mm.

As an index for measuring the capacity of the water purifier, fusible organic substances (COD 130 ppm, BOD 40 pp
m), an aqueous solution (hereinafter abbreviated as raw water) containing an ionic substance (nitrate ion 20 mg / l, sodium ion 50 mg / l) was used.

In the water purifier of FIG. 1, the activated carbon electrode is 5
0 g and 20 g of granular activated carbon (both containing a binder) were used, and raw water was purified at a rate of 100 ml / min.

(Example 1) Water purification was started with no voltage applied to the electrodes, and after 5 minutes, the concentration of the fusible organic substances and ionic substances (hereinafter referred to as treatment concentration) at the water purification outlet was investigated (measurement result A). ).

Example 2 A voltage of 1 V is applied to the electrodes,
Measure the treatment concentration after 5 minutes and 12 hours (measurement results B and C, respectively), then apply a voltage so that the potential between the electrodes is the same, and investigate the treatment concentration after 5 minutes (measurement result D), A voltage of 1 V was applied to the electrodes again, and the treatment concentration after 5 minutes was measured (measurement result E).

Table 1 shows a comparison of the relative concentrations of the measurement results A to E, where A is 100.

[0023]

[Table 1]

From this table, the following can be seen.

1) In the state where no voltage is applied to the electrodes, only the activated carbon filtration type water purification section works and the fusible organic matter is mainly removed.

2) When a voltage is applied to the electrodes, the ionic substance is also removed by the voltage application type water purification unit in addition to the removal of the fusible organic matter by the activated carbon filtration type water purification unit.

3) Both the activated carbon filtration type water purification unit and the electrode application type water purification unit adsorb a substance to a certain degree or more, but the water purification ability decreases, but the electrode application type water purification unit adsorbed by changing the voltage between the electrodes. Since the substance can be dissociated from the electrode, the water purification capacity can be activated again.

[0028]

As is apparent from the above description,
The present invention has a voltage-applied water purification unit that substantially removes ionic substances and a power supply for applying a voltage to the voltage-applied water purification unit, or a voltage-applied water purification unit that substantially removes ionic substances. Section, a power source for applying a voltage to the voltage application type water purifying unit, and an activated carbon filtration type water purifying unit that substantially removes the fusible organic substance, and thus is high in ionic substances in addition to the fusible organic substance A water purifier with removal ability can be achieved, and the removal ability of ionic substances can be reactivated, so the time until replacement can be lengthened.

[Brief description of drawings]

FIG. 1 is a block diagram of a water purifier according to an embodiment of the present invention.

[Explanation of symbols]

 1 Raw water inlet 2 Activated carbon filtration type water purification unit 3 Power supply 4 Voltage application type water purification unit 5 Water purification outlet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazushi Nishida 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Akihiko Yoshida 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A water purification apparatus comprising: a voltage application type water purification unit that substantially removes ionic substances; and a power supply for applying a voltage to the voltage application type water purification unit. 2. A voltage application type water purifying unit for substantially removing ionic substances, a power source for applying a voltage to the voltage application type water purifying unit, and an activated carbon filtration type water purifying unit for substantially removing fusible organic substances. A water purifier characterized by having. 3. The voltage application type water purifying unit is capable of electrostatically adsorbing an ionic substance to the activated carbon electrode by arranging at least two electrodes containing activated carbon and applying a voltage to both of them. , Or the water purification device according to 2. 4. The voltage application type water purifying unit can remove the ionic substance adsorbed to the electrode and reactivate the water purifying ability by arbitrarily changing the voltage and polarity applied to the electrode. The water purification device described in 2.