JPH0639388A - Apparatus and method for circulation cleaning of water - Google Patents

Abstract

PURPOSE:To avoid wasting water by cleaning the hot water in a bathtub without discarding by returning it into the bathtub after heating. CONSTITUTION:Filter medium cartridges 21 are piled into three stages from top to bottom in a filter cylinder 5 and in each filter medium cartridge 21, a structural body 31 consisting of the filter medium is set. The structural body 31 has a plurality of penetrating holes 32 in a definite direction and these penetrating holes 32 are positioned so as to bring these penetrating holes in parallel (in the top to bottom direction) with the passing direction of hot water. The structural body 31 is obtd. by extrusion-molding of the filter material and as the filter material, those which have a large specific area such as activated carbon, boiled rice and 'BAKUHAN SEKI' or sanitary clay are used. When the activated carbon is used, as the specific area is larger in comparison with others, a filter apparatus being compact and having high performance is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for purifying water in a bath water tank and returning it to the bath water tank again.

[0002]

2. Description of the Related Art An apparatus for purifying dirty water (hot water) in a bath water tank, heating it, and returning it to the bath water tank again is disclosed in Japanese Unexamined Patent Publication No. Sho 62-62.
-160116. This device passes the water in the bath water tank through a pipe to a filtration tank containing a filter cloth such as polyurethane to trap impurities in the water, and the water from which the impurities have been removed is heated in the heating unit, then boiled stone, etc. The active ingredients such as minerals are dissolved in water through the active tank filled with the activated stones, and then ozone sterilization is performed to return them to the bath water tank.

On the other hand, recently, a bathtub system that can be used for 24 hours has been proposed. This system purifies the water in the bath water tank without throwing it away, heats it up and returns it to the bath water tank, and uses it at the washing place to replenish it by the amount that has been reduced to completely eliminate the waste of water. It is a thing.

[0004]

When the device proposed in Japanese Patent Laid-Open No. 62-160116 is applied to the above-mentioned system, a problem occurs in terms of continuity. That is, the main purpose of this device is to capture impurities in the filtration tank, and the main purpose of the activated stone in the active tank is to release minerals into the water. Is insufficient. Further, in order to remove organic matter in water in an active tank filled with activated stone such as barley stone, the capacity of the active tank must be extremely large.

Therefore, instead of an activated stone such as barley stone, a structure obtained by immersing a porous honeycomb in a tar pitch as shown in Japanese Patent Laid-Open No. 3-69575 can be set in a filter cylinder. It is conceivable that this structure cannot effectively remove organic matter in the early stage of the circulation purification operation.

[0006]

In order to solve the above problems, a first invention of the present application is a filter medium having a plurality of through holes in a certain direction in a filter cylinder for purifying water in a bath water tank such as a pool or a bath. The structure made of was arranged such that the through holes were parallel to the passage direction of water, and a microbial layer that decomposes organic substances was formed on the surface of the structure. The second invention of the present application is
At the beginning of the circulation purification operation, the organic substances in the water are adsorbed on the surface of the filter medium inside the filter to physically remove them, and after a certain period of time, the organic substances in the water are chemically decomposed by the microbial layer formed on the surface of the filter medium. I tried to remove it.

[0007]

[Function] Since the honeycomb-like structure is formed by the filter medium itself having a large specific surface area such as activated carbon, it is possible to remove organic substances immediately after the start of the circulation purification operation without obstructing the flow of water in the filter cylinder. I can do it.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is an overall view of a system to which the water circulation purifying apparatus according to the present invention is applied, and FIG. 2 is a vertical cross-sectional view of a filter cylinder constituting the circulation purifying apparatus. The water intake of the circulation line 3 provided with the circulation pump 2 is connected, and the water discharge outlet of the circulation line 3 is connected to the upper part of the bath water tank 1. In the middle of the circulation line 3, a hair catcher 4, a filter cylinder 5, a sterilizer 6 using ultraviolet rays or ozone, or both of them, a heating device 7 and an ejector 8 are provided in this order from the upstream side.

As shown in FIG. 2, which is a vertical cross-sectional view, the structure of the filter cylinder 5 includes a filter medium cartridge 21 in a cylindrical case 20.
It is configured by stacking three layers vertically. The cylindrical case 20 is fixed by a nut member 23 with the lid 22 placed on the upper end opening, and the water inlet 24 is provided on the upper side surface of the cylindrical case 20 and the water outlet 25 and backwash is provided on the bottom surface. Opening 2
6, the lid 22 is formed with a gas vent hole 27, respectively.

As shown in FIG. 3, the filter medium cartridge 21 has an inner diameter at the upper end of a bucket-shaped storage case 28 that is substantially equal to the outer diameter at the lower end to prevent wobbling when stacked one above the other. Many holes 29 on the bottom of 28
Is opened, a grip 30 is attached to the upper edge, and a structure 31 made of a filter medium is set inside. The size of the through hole 32 of the structure 31 is set to be suitable for the growth of microorganisms (aerobic bacteria, anaerobic bacteria, etc.) that decompose organic substances.

The structure 31 has a plurality of through holes 32 in a certain direction.
The through holes 32 are arranged so as to be parallel to the water passage direction (vertical direction). In addition, the structure 31 has a stopper ring 3 at the upper and lower ends in the filter medium cartridge 21.
Holds at 3. By holding the stopper ring 33 in this way, the outer periphery of the structure 31 and the filter cartridge 2
Water is prevented from passing through a flow passage having a large flow passage cross-sectional area between the inner circumference and the inner circumference.

By the way, the structure 31 is obtained by extruding a filter medium, and as the filter medium, activated carbon, barley stone, kneaded clay or the like having a large specific surface area (surface area per unit volume) is used. When activated carbon is used, it has a large specific surface area including fine pores as compared with other types, and thus a compact and high-performance filtration device can be obtained.

On the other hand, in the case of clay, waste can be used.
That is, a slurry discharged during pressure molding of ceramics such as sanitary ware and tiles is collected, a coagulant is added to the slurry to cause precipitation, and the precipitate is dehydrated by applying a filter press to obtain clay. The structure 31 is obtained by extrusion molding and finally firing.

In the above, when the circulation pump 2 is driven to start the circulation purification operation, the dirty water that has entered from the inlet portion 24 of the filter cylinder 5 is the structure 3 in each filter medium cartridge 21.
It flows through the through hole 32 of No. 1 and is sent from the outlet part 25 to the sterilization device 6 on the downstream side. Then, in the initial stage of the circulation purification operation, the organic matter in the water is physically adsorbed on the surface of the structure 31 and captured, and hardly exits to the downstream side.

The organic matter physically adsorbed on the surface of the structure 31 serves as a nutrient source for microorganisms such as aerobic bacteria and anaerobic bacteria, and the surface of the structure 31 remains on the surface of the structure 31 after a certain period (about 1 week). A microbial layer is formed.

As described above, after the microbial layer is formed on the surface of the structure 31, organic matter in the water is chemically decomposed and removed mainly by the microorganism. In this way, by appropriately setting the specific surface area of the structure 31, the capacity of the filter cylinder 5, the amount of water to be treated, the material of the structure, etc., effective removal of organic substances can be performed immediately after the start of operation. It

Experiments have also revealed that the following conditions are preferable when the structure 31 (honeycomb) is made of activated carbon.

The content of activated carbon in the structure is preferably 30% by weight or more and 65% by weight or less. That is, when manufacturing a structure, the activated carbon is kneaded and molded with a binder. At this time, if the ratio of the activated carbon is large, the specific surface area is increased and the purification performance is improved, but on the other hand, the strength is weakened and the end portion is weakened. Chips and cracks are likely to occur. Taking these into consideration, the content of the activated carbon is preferably 30% by weight or more and 65% by weight or less, and particularly preferably 35% by weight or more and 45% by weight or less in consideration of moldability during production.

The flow path diameter of the structure is from 0.6 mm to 5.0 m
m or less is preferable. Here, the flow path diameter is, for example, the length of one side in the case of a square cell shape, the length of a diagonal line in the case of a hexagon, and the diameter in the case of a circle. The reason why the flow path diameter is set to 0.6 mm or more and 5.0 mm or less is as follows. That is, when the thickness of the biological layer attached to the flow channel surface of the structure increases, oxygen cannot permeate to the flow channel surface, and organisms on the flow channel surface die and peel off. As a result of experiments, it was found that the maximum thickness at which peeling did not occur was about 0.3 mm. Therefore, in order to prevent the clogging of the channel due to the biological layer attached to the channel surface, the channel diameter must be 0.6 mm or more. Further, if the flow path diameter is made too large, the surface area per unit volume becomes small and the purification performance deteriorates.
It is preferably 0 mm or less. From the experimental results, the optimum range of the channel diameter was 1.0 mm or more and 2.0 mm or less.

The thickness of the cell wall of the structure is 0.2 mm.
It is preferably not less than 1.0 mm. The thickness of 0.2 mm or more is used to prevent chipping, dropping, cracking, etc. of the cell wall surface due to mechanical shock applied during filtration of treated water or passage of washing water, and is set to 1.0 mm or less. Is
This is because if the thickness is made thicker than this, the number of cells decreases and the surface area per unit volume decreases.

[0021]

The following (Table 1) shows the removal of E260, TOC, chromaticity, and turbidity obtained after 24 hours have elapsed after total replacement of the water in the bath water tank after operating for 49 days with a circulation purifier. FIG. 5 shows the relationship between the ratio and each filter medium.
Is the change of organic matter (TOC) with time, and Fig. 6 is the organic matter (TOC).
The result of having experimented about each filter medium about the relationship between the removal of C) and the number of days from the start of operation is shown. (Table 1) and FIG.
From the one that formed the honeycomb structure with the filter medium itself,
It can be seen that the effect of removing TOC and the like is significantly superior to the case of using other filter media. Further, it can be seen from (Table 1) and FIG. 6 that the activated carbon honeycomb has a remarkable effect on the startup characteristics of the operation.

[0022]

[Table 1]

FIG. 7 shows the surface area per unit volume and the Kv value (the value obtained by dividing the reduction rate of TOC in the bath water by the square of the TOC concentration (K value) converted into the purification performance per volume).
It is a graph showing the relationship with, and as is clear from this graph, when the activated carbon honeycomb (AC) is used, the Kv value becomes extremely high, and it can be seen that it has a high purification performance.

As described above, according to the present invention, since the honeycomb-like structure made of the filtering material is arranged in a predetermined direction in the filter cylinder constituting the water circulation purifying apparatus, the flow of water is prevented. Organic substances in water can be efficiently removed without any inhibition. In particular, at the beginning of the circulation purification operation, the organic matter in the water is adsorbed and removed on the surface of the filter medium in the filter cylinder, and thereafter, the organic matter in the water is decomposed and removed by the microbial layer formed on the surface of the filter medium. The start-up performance is improved.

[Brief description of drawings]

FIG. 1 is an overall view of a system to which a water circulation purification device according to the present invention is applied.

FIG. 2 is a vertical cross-sectional view of a filter cylinder that constitutes the water circulation purification device according to the present invention.

FIG. 3 is a cross-sectional view of a filter medium cartridge set in a filter cylinder.

FIG. 4 is a perspective view of a structure housed in a filter medium cartridge.

FIG. 5 is a graph showing changes over time in organic substances.

FIG. 6 is a graph showing the relationship between the removal rate of organic matter and the number of days from the start of operation.

FIG. 7 is a graph showing the relationship between the surface area per unit volume and the Kv value.

[Explanation of symbols]

1 ... Bathtub, 5 ... Filter cylinder, 21 ... Filter medium cartridge, 31
... A structure made of a filter material, 32 ... Through holes.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location C02F 1/68 3/10 Z 3/28 B F24H 9/00 W (72) Inventor Junko Fukuda Fukuoka 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu, Tochigi Co., Ltd. (72) Inventor Shingo Sato, 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu, Kitakyushu, Fukuoka Prefecture (72) Invention Shintaro Harite, 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture Totoki Equipment Co., Ltd. (72) Inventor Emika Ogawa 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu, Kitakyushu, Fukuoka Prefecture In-house (72) Inventor Taimon Kimura 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture Totoki Equipment Co., Ltd. (72) In-house Takuo Imasaka 2-1-1, Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Issue TOTO within Co., Ltd. (72) inventor Teraoka high school students Kitakyushu, Fukuoka Prefecture Kokura-ku Nakajima 2-chome No. 1 No. 1 TOTO within Co., Ltd.

Claims (5)

[Claims] 1. A water circulation purifying device in which water in a bath water tank is returned to the bath water tank through the inside of a filter cylinder, wherein a structure having a plurality of through holes in a certain direction is provided in the filter cylinder. The through holes are arranged so as to be parallel to the passage direction of water, and this structure is formed by molding a filter medium having a large specific surface area, and a microbial layer that decomposes organic substances is formed on the surface. Circulating water purification device. 2. The structure is obtained by coagulating and precipitating a slurry discharged in a ceramics manufacturing process, dehydrating the slurry, and molding and firing clay.
The water circulation purification device described in 1. 3. The water circulation purifier according to claim 1, wherein the structure is made of activated carbon. 4. The content of the activated carbon is 30% by weight or more and 6
The water circulation purifying apparatus according to claim 3, wherein the content is 5% by weight or less. 5. A method for circulating purification of water in which water in a bath tank is returned to the bath tank through the inside of the filter cylinder, wherein organic substances in water are adsorbed on the surface of the filter medium in the filter cylinder at the initial stage of the circulation cleaning operation. At the very least, in parallel with this, a layer of microorganisms with adsorbed organic matter as a nutrient source is formed on the surface of the filter medium,
A method for circulating and purifying water, characterized in that after a certain period of time, organic matter in water is decomposed and removed by a microbial layer formed on the surface of the filter medium.