JP2002282860A - Method and equipment for purifying swimming pool water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and equipment for purifying a swimming pool water preferably satisfying capabilities required for a purifying equipment for filtration, sterilization and adsorption purification or the like of impurities contained in the swimming pool water, and capable of performing its operation at a low cost. SOLUTION: The method and equipment for purifying the swimming pool water which is characterized in that using a swimming pool water purifying equipment having at least filtering means, electrolytic means of the swimming pool water after performing a filtration treatment at the sequent stage of the filtering means is provided and the salinity (a substance contained in a sweat, etc., emitted from a human body) contained in the swimming pool water can be utilized as a part of chlorine preparation to be added for disinfection by electrolyzing the salinity. This enables the operation cost of the swimming pool to be largely reduced while substantiating treatments such as disinfection.

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 purifying pool water, and more particularly, to effectively use salt contained in sweat and the like from a user's body that accumulates in pool water during pool operation. The present invention relates to a pool water purification processing method and apparatus.

[0002]

2. Description of the Related Art With the recent fitness boom, there are more swimmers who perform swimming as whole body exercises suitable for promoting health and relieving stress, and more and more people of all ages are familiar with the pool. With this, there is an increasing interest in the sanitary conditions of pools, especially water quality, in order to enjoy swimming more safely and sanitarily, and therefore, there is an increasing demand for pool water purification treatment devices that determine the water quality of pools. It is becoming increasingly severe, and higher performance is being promoted.

The above-mentioned pool water purification apparatus will be described in detail. The pool water purification apparatus generally includes a pre-filtration device, a microfiltration device, an adsorption purification device for removing impurities such as dust and hair contained in the pool water. It has a device, a sterilizing device for sterilizing the pool water, etc., and if necessary, a device for supplying a filter aid to the filtering device, and a heating means for the pool water for a hot water pool. Usually, pool water is purified by being circulated between the purification apparatus and the pool, and is kept sanitary.

Under such circumstances, a porous ceramic filter is often used as a filtration device applied to water purification equipment such as a pool water purification treatment device. The porous ceramic filter has a three-dimensional very fine filtration space which is preferable for filtering a pool, particularly a hot water pool, and it is impossible to filter with a conventional filter. Can also be suitably filtered.

In the operation of a pool, it is important to maintain the water quality within a specified range. The specified range here refers to a specified range based on a water supply standard according to the Water Supply Law, a water quality standard of swimming pool water, and the like. In order to satisfy such a criterion, various types of water purification treatment devices (pool water purification treatment devices) are installed in each pool, and the pool water purification treatment is performed.

[0006] The pool water purification apparatus is described in, for example, Japanese Patent Application Laid-Open No. 11-347376 filed by the present inventor, entitled "Porous Ceramic Filter and Fluid Purification Method and Apparatus Using the Same." As described in the above, there are various kinds of purification processing devices such as a filtration device, a sterilization device, and an adsorption purification device.

[0007] The pool water taken out of the pool in operation due to overflow or the like is sequentially treated by the above-mentioned various purification treatment devices and purified, and then chlorine for disinfection is added to meet the above-mentioned standards. After being used, it is returned to the pool and used repeatedly. In this process, part of the pool water is drained, and fresh tap water or well water is supplied instead.

[0008]

As described above, in the conventional pool water purification treatment, the treatment is performed using various purification treatment devices such as a high-performance filtration device, a sterilization device, and an adsorption purification device. In addition, there is a double safety measure of adding chlorine for disinfection. And
The amount of chlorine for disinfection is defined as active chlorine, that is, hypochlorous acid.

[0009] Therefore, in the conventional pool water purification treatment, the purification treatment is performed using various purification treatment devices such as a high-performance filtration device, a sterilization device, and an adsorption purification device.
Although hypochlorite is added, such a method consumes a large amount of hypochlorite and occupies a part that cannot be ignored in terms of cost.

The present invention has been made in view of the above situation, and a first object of the present invention is to provide various kinds of purification processing apparatuses such as the above-mentioned high-performance filtration apparatus, sterilization apparatus, and adsorption purification apparatus. Reduces the consumption of newly added hypochlorite by adding a process that converts salt contained in pool water to hypochlorite and returns it to pool water while performing treatment. It is an object of the present invention to provide a pool water purification treatment method and apparatus that perform the above.

A second object of the present invention is to provide a porous ceramic filter and a method and an apparatus for purifying fluid using the same as described in Japanese Patent Application No. 10-175269 filed by the present applicant. No. 347376), the problems of the prior art are solved by further improving the fluid purification treatment apparatus proposed in the present invention, and the required performance of the pool water purification treatment apparatus such as filtration, adsorption purification, and sterilization of impurities is preferably achieved. Another object of the present invention is to provide a pool water purification method and apparatus which can satisfy the above requirements and can be operated at low cost.

[0012]

In order to achieve the above object, a pool water purification method according to the present invention is a pool water purification method having at least a filtration step, wherein a filtration step is provided after the filtration step. Characterized by having an electrolysis step of pool water that has been completed. Further, a sterilization step of the pool water after the filtration step is provided at a stage subsequent to the filtration step, and the pool water after the sterilization step is electrolyzed by the electrolysis step.

Further, the pool water purification method according to the present invention comprises, after the sterilization step, an adsorption purification step of the pool water after the filtration step and the sterilization step, and the pool water after the adsorption purification step. Is subjected to an electrolysis treatment in the electrolysis step. Further, the method is characterized in that at least one of the former stage and the latter stage of the electrolysis step includes a step of adding a chlorine preparation for disinfection.

Further, the pool water purification method according to the present invention is characterized in that the filtration step is performed using a porous ceramic filter. Further, the filtration step is performed by applying a precoat containing activated carbon to the porous ceramic filter.

Here, as the porous ceramic filter, a cylindrical body having an outer peripheral surface in contact with the pool water before the purification treatment and an inner peripheral surface defining a central through hole through which the pool water before the purification treatment flows is used. It is possible to use a cylindrical porous ceramic filter having a plurality of through-holes through which pool water after purification treatment flows in a thick portion between the outer peripheral surface and the inner peripheral surface of the cylindrical body in the axial direction thereof. preferable.

The pool water purification method according to the present invention having the above-described features can be embodied as a pool water purification apparatus as described below.

That is, the present invention relates to a pool water purifying treatment apparatus having at least a filtering means, wherein a pool water purifying means after the filtering step is provided downstream of the filtering means. It can be embodied as a processing device. Here, it is preferable that a sterilizing means for the pool water having been subjected to the filtering step is provided at a stage subsequent to the filtering means, and the pool water having been subjected to the sterilizing step by the sterilizing means is electrolyzed by the electrolyzing means.

Further, the pool water purification treatment apparatus according to the present invention includes, after the sterilizing means, a pool water adsorption / purifying means which has completed the filtration and sterilizing steps by the filtering means and the sterilizing means. It is preferable that the pool water after the adsorption and purification step is electrolyzed by the electrolyzing means. Furthermore, it is preferable that at least one of the preceding stage and the subsequent stage of the electrolysis means is provided with a disinfecting chlorine preparation adding means.

Further, in the pool water purification treatment apparatus according to the present invention, it is preferable that the filtering means is constituted by a porous ceramic filter. Here, the porous ceramic filter is formed of a cylindrical body having an outer peripheral surface that comes into contact with the pool water before the purification treatment and an inner peripheral surface that defines a central through hole through which the pool water before the purification treatment flows. It is preferable to use a cylindrical porous ceramic filter having a plurality of through-holes in a thick portion between the outer peripheral surface and the inner peripheral surface of the cylindrical body, through which the purified pool water flows in the axial direction thereof.

Further, in the pool water purification apparatus according to the present invention, it is preferable that the sterilizing means is an ultraviolet irradiation means and an air bubbling means. Moreover,
It is preferable that the adsorption and purification means is configured to include activated carbon.

Further, the pool water purification treatment apparatus according to the present invention preferably has an air supply means for returning oxygen generated in the electrolysis step by the electrolysis means to the sterilization step. Further, in the pool water purification treatment apparatus according to the present invention, the filtering means may be a combination of a sand filtering means and a microfiltration means using the porous ceramic filter.

According to the pool water purification treatment method of the present invention, a chlorine preparation for disinfecting the salt (contained in sweat and the like released from the human body) contained in the pool water to be treated by electrolysis. And the amount of chlorine preparation added can be reduced. As a result, it is possible to significantly reduce the running cost of the pool operation while exemplifying the processing such as disinfection.

Further, the pool water purification apparatus according to the present invention is an apparatus capable of efficiently executing the above-described pool water purification processing, and capable of realizing the above-described functions and effects. It is.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a pool water purification apparatus according to the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited thereto.

FIG. 1 is a diagram showing a basic configuration of a pool water purification system using a pool water purification system according to one embodiment of the present invention. The pool water purification system shown in FIG. 1 includes an overflow tank 14 for storing pool water overflowing from a pool 12, a pre-filter (hair catcher) 16, a pool water circulation pump 18, and a pool water purification process of the present invention. It has a device 10, a filter aid supply unit 22, a chlorine tank 24 and an ultrafiltration device 26. In addition, 84a and 86a have shown valves.

The overflow tank 14 is provided for the pool 12
Pool water that has overflowed from the pool or that has been forcibly drained by natural drainage or a pump or the like is temporarily stored, and a predetermined amount of pool water is supplied to the pre-filters 16 and 16 through piping.

The pre-filters 16 and 16 are, for example, those in which a carbon filter or the like is arranged in a tank.
The purpose of the present invention is to remove coarse impurities such as hair, lint, bandage and dust contained in or floating in the pool drainage flowing out of the overflow tank 14. Water purification treatment (particularly, a porous ceramic filter 2 described later)
0).

The pumps 18, 18 are circulation pumps,
Any type may be used as long as it provides energy for flowing the pool water in the flow path of the pool water purification treatment apparatus 10 of the present invention. This circulation pump may be a single pump, or a plurality of pumps arranged in parallel or in series.

The pool water from the pumps 18, 18 is then subjected to microfiltration, sterilization and adsorption purification by the pool water purification treatment apparatus 10 of the present invention. Hereinafter, a detailed configuration example of the pool water purification treatment apparatus 10 of the present invention will be described with reference to FIG.

As shown in FIG. 2, the pool water purification treatment apparatus 10 according to the present embodiment includes a microfiltration section 84, a sterilization section 90, an adsorption purification section 86, an electrolysis section 88, and an electrolysis section. And a mixing section 92 for the effluent from 88.

The pool water from the pumps 18 flows into the microfiltration unit 84 via the valve 84a, and is filtered by the microfiltration unit 84. The microfiltration unit 84 is provided with a porous ceramic filter (hereinafter simply referred to as a ceramic filter) 20 to be described later. This is an apparatus for purifying pool water by filtering fine particles such as bacteria and the like (for example, fine particles of about 0.25 μm to 1 μm).

In the microfiltration section 84, a plurality of ceramic filters 20 (for example, 100 to 15) capable of filtering fine particles of about 0.25 μm to 1 μm as described above are provided.
(About 0). As the ceramic filter 20, various types such as an ordinary cylindrical shape can be used. For example, length 500mm, inner diameter 50mm, outer diameter 85
mm commercially available ceramic filters can be used. However, preferably, it has an outer peripheral surface that contacts pool water before purification treatment and an inner peripheral surface that defines a central through hole, as disclosed in Japanese Patent Application Laid-Open No. 5-253451 filed by the present applicant. A ceramic filter which is formed of a cylindrical body and has a plurality of through holes through which pool water after purification treatment flows in the axial direction in a thick portion between the outer peripheral surface and the inner peripheral surface of the cylindrical body is preferably used. Is done.

As shown in FIGS. 3A and 3B, the ceramic filter 20 includes a cylindrical body 42 having an outer peripheral surface 42a and an inner peripheral surface 42b. One having a plurality of through-holes 43 parallel to the axis of the cylindrical body 42 in the thick portion 42c is exemplified. In the illustrated example, ten through-holes 43 are formed in the cylindrical body 42, and the cross-sectional shape thereof is an ellipse, but the number and shape are not particularly limited. While the ordinary ceramic filter is a simple cylindrical body, the ceramic filter 20 has a plurality of through holes 43 for flowing at least the primary filtered pool water through the thick part 42c of the cylindrical body 42. Is provided. Therefore, it is effective to use the ceramic filter 20 according to the method described below, for example.

That is, not only the outer peripheral surface 42a of the cylindrical body 42 but also the inner peripheral surface 42b is pre-coated with a filter aid, and the center through hole 4 formed by the inner peripheral surface 42b of the cylindrical body 42 is formed.
4, the pool water before the purification treatment is also flowed, and the unpurified pool water is brought into contact with both the outer peripheral surface 42a and the inner peripheral surface 42b,
Since the purified pool water can be recovered from the through-hole 43, the processing capacity of the pool water can be greatly improved.

In the present invention, in addition to the above,
Various ceramic filters as disclosed in FIG. 4 and FIGS. 11 to 17 of JP-A-5-253451 can also be suitably used.

Further, as another example of the ceramic filter 20, Japanese Patent Application No.
175426, "Porous ceramic filter and method and apparatus for purifying fluid using the same"
No. 347376), a cylindrical body having an outer peripheral surface that comes into contact with pool water before purification treatment and an inner peripheral surface that defines a center through hole. In the thick portion between the inner peripheral surface, a plurality of through holes through which the pool water after the purification treatment flows in the axial direction thereof, and a ceramic filter having a communication flow path connecting the outer peripheral surface and the inner peripheral surface, It is preferably available.

As shown in FIG. 4, this ceramic filter is provided between the plurality of through holes 43 of the above-described ceramic filter through which the pool water after the purification treatment flows in the axial direction thereof, with the outer peripheral surface 42a. A large increase in the filtration area is realized by using the communication flow path 47 connecting the inner peripheral surface 42b. In another preferred embodiment, this ceramic filter is formed by combining a large number of ceramic filter membrane cells 46. It is something.

The method of using this ceramic filter is substantially the same as that of the above-described ceramic filter. However, since the filtration area is greatly increased, the filtration efficiency can be further greatly improved. There are features. Ceramic filter 20 having the above configuration
In the microfiltration section 84, a plurality of pieces (three pieces in the example shown in FIG. 2, but not limited to three pieces) are used by being joined by an appropriate joining member.

When using such a ceramic filter, first, various filter aids supplied from a filter aid supply unit 22 described later are mixed with the ceramic filter 20.
Is pre-coated on the outer peripheral surface 42a and the inner peripheral surface 42b. Then, the pool water to be purified, introduced into the microfiltration unit 84 via the valve 84a, is also introduced into the central through hole 44 of the ceramic filter 20 to pressurize not only the outer peripheral surface 42a but also the inner peripheral surface 42b. By contact, the impurities in the pool water are mainly adsorbed by the filter aid, and are further filtered off by the ceramic filter 20 to allow only the clean water to permeate and flow into the through holes 43.

The ceramic filter 20 having such a configuration
By using the unpurified pool water supplied from both the outer peripheral side and the center hole side of the ceramic filter 20,
After being filtered, it passes through the through-hole 43 in the thick portion 42c (or in the above-mentioned ceramic filter membrane cell 46). The purified pool water is collected from the through hole 43 and sent to the next step.

On the other hand, at the time of the back washing operation of the ceramic filter 20 to be described later, a gas-liquid two-phase jet water flow is introduced from the through hole 43 side of the ceramic filter 20, and the jet water flow flows through the ceramic filter 20
Outer peripheral surface 42a and inner peripheral surface 42b of the
7) and the impurities trapped in the ceramic filter 20 and the outer peripheral surface 42a and the inner peripheral surface 42b (and the above-described ceramic filter membrane cell 46).
The filter aid and the filter cake that have been pre-coated on the outer peripheral surface are blown off and removed.

After the backwash, the outer peripheral surface 42a is subjected to a shower from a nozzle provided in the microfiltration unit 84, so that the inner peripheral surface 4a is
2b is cleaned by a shower from a nozzle provided in the center through hole 44. As described above, in the filtration unit according to the present embodiment, the filtration of a large amount of pool water and the backwashing of the ceramic filter 20 can be performed smoothly.

The pool water purification apparatus 10 illustrated in FIG.
In A, the pool water filtered by the ceramic filter 20 is collected through a valve 84 b and sent to the sterilizing section 90.

The sterilizing section 90 is for sterilizing, sterilizing, and inactivating bacteria and viruses such as Escherichia coli and staphylococci contained in the pool water. The sterilizing section 90 uses an ultraviolet lamp inserted in a transparent quartz glass tube. In addition to sterilizing the filtered pool water circulating outside the quartz glass tube, oxygen gas and dry air are supplied into the quartz glass tube to generate ozone by the ultraviolet lamp, and the generated ozone-containing air is removed. Oxidation sterilization by pool water ozone is performed by sufficiently bubbling and stirring into the pool water and mixing as small bubbles. Usually, pool water is sterilized with chlorine, and the ultraviolet sterilization and ozone sterilization make the effect of the chlorine preparation mixed into the pool water even more effective.

The pool water sterilized by the sterilizing section 90 is then sent to the adsorption and purification section 86, where it is adsorbed and purified. That is, in the adsorption purification section 86, the sterilized bacteria existing in the pool water are adsorbed and removed.

The adsorption purification layer of the adsorption purification section 86 is filled with an adsorbent such as zeolite, activated carbon, and silica gel. The adsorption purification layer contains ammonia generated from sweat and urine contained in pool water after filtration and sterilization. This is for removing bacteria, pigments, bound chlorine, and the like decomposed in the sterilizing section 90 by adsorbing the adsorbent by an adsorbent or the like.

The adsorbent is not particularly limited as long as it does not dissolve substances harmful to the human body in the pool water. Zeolite, activated carbon, and silica gel are preferred. Here, zeolite is particularly effective for adsorbing and removing the above-mentioned ammonia, activated carbon adsorbs and removes odor components, dyes, and bound chlorine in pool water, and silica gel selectively removes proteins, in particular. Has the effect of removing.

Next, the pool water purified by the adsorption purification section 86 flows into the electrolysis section 88. In the electrolysis unit 88, a predetermined DC voltage is applied to the pool water that has been subjected to the adsorption purification process by the adsorption purification unit 86, and the electrolysis process using the diaphragm is performed.

Hereinafter, the electrolysis process, which is a characteristic process of the present invention, will be described in detail. The pool water unpurified, salinity were included such as sweat emitted from the body, Cl ^- as generally 10mg / l~200
It is known to be present in the order of mg / l. here,
The unpurified pool water containing the salt is electrolyzed, and the salt is used as hypochlorite ion for disinfection.

As the electrolysis process proceeds, hydrogen gas is generated at the cathode of the electrolysis section 88. Further, chlorine gas is initially generated at the anode, and when the electrolysis treatment further proceeds and the chlorine ion concentration near the anode decreases, oxygen gas is generated. Then, the generated chlorine gas is immediately absorbed by water and changes to hypochlorite ion,
Used for disinfection of pool water.

The technique of extracting salt as hypochlorite ion from water containing salt by electrolysis and using the same for disinfection as described above requires that the salt be used for purification treatment of pool water. Not only can be
Needless to say, it can be suitably used for other various treatments, for example, purification treatment of drinking water and purification treatment of leachate from an industrial waste treatment plant.

On the other hand, the oxygen generated in the gaseous state is sent to the sterilizing section 90 and used for bubbling the filtered pool water. In this process, a part of the radical is changed to ozone due to a radical reaction caused by the irradiation of the ultraviolet rays, which itself contributes to the bactericidal action.
In addition, it is also possible to directly generate ozone at the anode by forming the anode with a metal that serves as a catalyst effective for generating ozone.

Incidentally, with the progress of the above-mentioned electrolysis treatment,
Water near the cathode becomes weakly acidic, and water near the anode becomes slightly alkaline. Therefore, the two are mixed in the mixing unit 92, and if necessary, the pH is further adjusted to be within a predetermined range, and then the pool water purification treatment apparatus 10A
To be sent out.

It is also possible to adjust the concentration of free residual chlorine within a predetermined target value range by adding a chlorine preparation before refluxing the electrolyzed water to the pool. In addition, it is also possible to measure various characteristics of the water to be treated at arbitrary plural points in time, and feed back the results to each of the preceding treatment steps as needed, so that appropriate measures can be taken.

For example, the cleaning time of the ceramic filter of the microfiltration unit 84 is adjusted based on the change in the treatment flow rate, or the chlorine preparation is added to the pool water before the electrolysis treatment according to the amount of salt in the pool water before the electrolysis treatment. Treatment such as addition is performed. In addition, it is effective to apply vibration to the electrode of the electrolysis unit 88 in order to prevent deposits (mainly calcium compounds) from adhering. The vibration, for example,
A method using an ultrasonic vibrator, a method using an ultrasonic motor (in this case, an effect of removing precipitates by sliding can be expected) can be suitably used.

The pool water that has been highly purified by the pool water purification apparatus 10A as described above then flows into the ultrafiltration device 26, where it is further highly purified, and is returned to the pool 12. At this time, if necessary, it is possible to heat to a predetermined temperature through a heat exchanger. The ultrafiltration device 26 separates and removes viruses smaller than fungi, such as AIDS virus, influenza virus, Japanese encephalitis virus, hepatitis virus, and proteins, which cannot be separated and removed by the ceramic filter 20. In this, a number of ultrafiltration membranes such as hollow fiber membranes are arranged.

Among impurities generated from the human body or the like and mixed into the pool water, the ceramic filter 20 has a size of about 0.2 μm to 0 μm, such as bacteria such as Escherichia coli, cholera, typhoid, and Pseudomonas aeruginosa. Although impurity particles having a diameter of about 0.5 μm or more are removed, impurity particles having a diameter of less than 0.5 μm cannot be removed.

Therefore, in the ultrafiltration device 26, proteins having a particle diameter of about 0.001 μm to 0.2 μm (for example, 0.1 μm) remaining in the pool water by an ultrafiltration membrane such as a hollow fiber membrane. 002 μm to 0.01 μm) and viruses (for example, 0.01 μm to 0.2 μm).
μm) and bacteria (for example, about 0.2 μm to 0.5 μm) that could not be completely removed by the ceramic filter. However, ions and molecules required in the pool water, for example, metal ions such as Na ⁺ , anions such as Cl ^−, and the like permeate the ultrafiltration membrane.

Conventionally, when a large amount of pool water is to be filtered using a filter as fine as such an ultrafiltration membrane, clogging occurs immediately and continuous filtration is impossible. However, in the illustrated example, before the ultrafiltration, ultrafiltration of a large amount of pool water is enabled for the first time by preliminarily filtering the pool water with the ceramic filter 20.

Here, the ultrafiltration membrane is not particularly limited, and may be a known ultrafiltration membrane, that is, a hollow fiber membrane, such as a Kuraray UF filter (manufactured by Kuraray). Can be. Further, such a hollow fiber membrane may be ultrafiltered from the outside to the inside, or may be ultrafiltered from the inside to the outside.

As described above, the pool water purification system of the illustrated example assists the filtration of the pool water by the ceramic filter 20, and furthermore, the filtration for preventing the clogging of the ceramic filter 20 and facilitating the backwashing. It has a filter aid supply unit 22 for supplying the aid.

The filter aid supply unit 22 keeps the filtering ability of the ceramic filter 20 of the microfiltration section 84 in the pool water purification treatment apparatus 10A always in a good state, and facilitates washing and backwashing. It holds a filter aid for forming a layer, and before starting use of the microfiltration unit 84,
This is converted to a pool water purification treatment device 1 by a slurry pump.
Supply to the ceramic filter 20 within 0A.

That is, since the ceramic filter 20 has fine pores, if it is used directly for filtration, the fine pores are immediately clogged, and the filtering ability is reduced in a short time. For this reason, the ceramic filter generally uses a filter aid layer which is easy to remove on the inflow side surface.

Examples of the filter aid include powdery filter aids such as diatomaceous earth and lime, and fibrous filter aids such as cellulose, pulp fiber and asbestos, and silica gel capable of selectively removing proteins. It is preferable to use Therefore, on the inflow side surface of the ceramic filter 20, a release layer made of a powdery filter aid which can be easily removed is provided, and a filter layer made of a fibrous filter aid and a silica gel layer are formed thereon. Is preferred.

In the present invention, it is preferable to use a secondary auxiliary layer made of powdered activated carbon on the primary auxiliary layer formed of the fibrous filter aid and the like. As a result, a novel effect of removing bound chlorine, which has been impossible by the conventional method, can be obtained by utilizing the adsorption capacity of activated carbon. In addition, since the activated carbon layer is formed on the primary auxiliary layer formed of a fibrous filter aid or the like, it is difficult to cause clogging of the ceramic filter 20 even when powdered activated carbon is used. effective.

In the pool water purification treatment system shown in FIG. 1 basically configured as described above, the pool 1
The pool water overflowed from 2 flows into the overflow tank 14 and after relatively large impurities such as hair and lint are removed by the pre-filters 16, 16, the pool water purification treatment device is operated by the circulation pumps 18, 18. Flow into 10A.

The pool water flows into the microfiltration unit 84 via the valve 84a, is microfiltered by the ceramic filter 20, and then is subjected to the sterilization unit 9 using ultraviolet light and ozone.
After the water is sterilized by flowing into the water 0, it flows into the adsorption purification layer of the adsorption purification unit 86 using activated carbon or the like, and adsorbs and removes unpleasant odor molecules such as ammonia and viruses and bacteria killed by the sterilization unit 90. After that, it is sent to the electrolysis unit 88.

The pool water, which has undergone electrolysis in the electrolyzing section 88 to change the salt into an effective disinfectant component, contains the acidic water,
Pool water purification treatment device 1 as a mixture of alkaline water
Sent from 0A. Thereafter, the pool water that has been highly purified by the pool water purification treatment device 10A flows into the ultrafiltration device 26, is further ultrafiltered, and is returned to the pool 12 as the purified pool water.

According to the pool water purification treatment apparatus 10A shown in the above embodiment, filtration, sterilization, adsorption purification and the like of impurities can be performed.
The effect of being able to efficiently perform the processing required of the pool water purification treatment device and realizing a pool water purification treatment device that can effectively use the salt released from the human body brought into the pool water. Is obtained.
In addition, the pool water purification treatment apparatus 10A shown in the above embodiment.
According to this, there is also obtained an effect that NaCl (sodium chloride) contained as an impurity in a chlorine preparation used for sterilization can be effectively used. This leads to a reduction in the production of chlorine products, and can be greatly appreciated from the viewpoint of global environmental protection.

Here, the configuration of the electrolysis unit 88 will be described. As described above, the electrolyzing unit 88 applies a predetermined DC voltage to the pool water that has been subjected to the adsorption purification treatment, and performs electrolysis using a diaphragm (ion membrane). Regarding the shape of the electrode, it is preferable to consider the following points.

That is, it is preferable to pay attention to the arrangement of the electrodes for improving the efficiency of the electrolysis. For example,
Compared to the case where a pair of plate-shaped electrodes are opposed to each other as shown in FIG. 5A, the case where a pair of concentric electrodes are opposed to each other as shown in FIG. For example, when a plurality of cylindrical electrodes are opposed to each other as shown in (1), the amount of water to be treated that can be treated per unit time in a treatment tank having the same volume is greatly increased.

In FIG. 5, reference numeral 88a denotes an anode, 88b denotes a cathode, and 88c denotes a diaphragm. As the diaphragm 88c, it is preferable to use an ion-selective permeable membrane (for example, Nafion (trade name, manufactured by DuPont)) having a shielding property (non-permeability) having extremely high selectivity to chloride ions.

Further, in addition to the shape of the electrode itself, a comparison between a homogeneous plate-like material and a fine mesh-like material constituting the electrode reveals that a fine mesh-like material can increase the surface area of the electrode. Minutes of water can be treated. In designing an actual electrode, it is necessary to determine the material and shape suitable for the shape of the processing tank, the target processing speed, and the like in consideration of these points.

Further, in the pool water purification treatment apparatus 10 according to the present invention, in order to maintain the filtration ability of the ceramic filter in the microfiltration section 84 at a high level, it is preferable to appropriately perform backwashing and washing. This preferably comprises a backwashing device having the function of supplying a high-pressure air-containing washing water stream.

The backwashing device, for example, every predetermined period of time before the filtering efficiency is reduced so that the filtering performance of the ceramic filter 20 in the pool water purification treatment device 10 is maintained in a good state, for example. A circulation circuit for accelerating the flow rate of the cleaning water and a mixer for accelerating the cleaning water for generating a high-pressure air-containing cleaning water stream (jet water stream) for removing and cleaning the deposited filter cake. Preferably, it is provided.

Further, the ultrafiltration device 26 may be provided with the same backwashing device as above. As a result, it is possible to prevent a decrease in the filtration efficiency of the ultrafiltration membrane, maintain the efficiency at a high level, and reduce the frequency of replacement of the expensive ultrafiltration membrane. This backwashing device includes a tank for supplying cleaning water, a pump, and an ultrasonic generator.

In the back washing of the ultrafiltration device 26, the washing water is caused to flow into the outlet side of the ultrafiltration device 26 by the pump, and to flow back from the inside of the ultrafiltration membrane to the outside thereof, and is captured by the ultrafiltration membrane. The impurity fine particles that have flowed out are discharged to the outside, and the washing water containing the fine impurity particles is discharged to the outside of the ultrafiltration device 26. At this time, ultrasonic waves are oscillated from the outer periphery of the ultrafiltration device 26 toward the center by the ultrasonic generator, and the ultrafiltration membrane is ultrasonically oscillated, so that the captured impurity fine particles are backwashed and removed. And the backwashing efficiency can be increased.

The above-described microfiltration unit 84 and ultrafiltration device 26
It is also effective to divert water containing ozone (ozone water) generated in the sterilizing section 90 for backwashing of a filtration device such as the above. Further, the ozone water can be suitably used for cleaning the adsorbed carbon in the adsorption / purification section 86 and the like.

In the example described above, the porous filter used for the precision filtration means of the pool water purification treatment apparatus according to the present invention has been described using a porous ceramic filter as a representative example, but the present invention is not limited to this. The material is particularly ceramic as long as it has very fine pores three-dimensionally, such as a porous ceramic filter, and can also filter fine particles such as bacteria and oil released from a living body. It is not limited to.

The size of the hole of the filter may be appropriately selected according to the particle diameter of the impurity to be removed in the liquid to be treated. For example, porous filters of various materials, such as a compressed stainless pile obtained by press-compressing a fibrous material having a three-dimensional structure, a compressed metal pile, a compressed carbon fiber, a sintered metal, and a solidified resin bead. Can be mentioned.

In addition to the use of ultrasonic waves, in addition to the above-described prevention of deposition of deposits on the electrodes of the electrolyzing section 88, sterilization by ozone in the sterilizing section 90 or the like, or the adsorption and purification section 86 It can also be used to improve the effect of the adsorption action by activated carbon in. The ultrasonic wave in this case is transmitted to the sterilizing section 9.
0, it is preferable to supply by a method in which a vibrator is provided in the vicinity of the ozone blowing port of the adsorption purification section 86 or the like.

Further, as an ultraviolet lamp used in the sterilizing section 90, the present applicant has previously disclosed in Japanese Patent Application No.
-351148 "Ultraviolet fluorescent lamp and purifier"
The use of an ultraviolet fluorescent lamp that emits two types of ultraviolet light having different wavelengths and has a function of efficiently generating ozone as well as sterilizing can further improve the efficiency of the processing. .

FIG. 6 shows an electrolysis unit 88 when the above-described ultrasonic oscillator and ultraviolet fluorescent lamp are used in combination.
FIG. 3 is a partial cross-sectional view showing the configuration of FIG. Here, FIG.
The ultrasonic oscillator 88d is attached to the cylindrical electrodes 88a and 88b as shown in FIG.
An annular ultraviolet fluorescent lamp 90A is arranged so as to correspond to 8a and 88b, and an ultrasonic oscillator 88d is also arranged around the ultraviolet fluorescent lamp 90A.

According to this configuration, the water W to be treated, which is supplied from the bottom of the figure, is subjected to a sterilization treatment by ultraviolet irradiation immediately after being subjected to the electrolysis. Precipitates are hardly adhered by the action, and in the sterilization treatment by ultraviolet irradiation, the effect that this is accelerated by the action of the ultrasonic wave is obtained, and further, the effect that the water flow around the ultraviolet fluorescent lamp 90A is accelerated is also obtained. can get.

The electrolysis unit 88 according to the above configuration can be further integrated and compact as shown in FIG. Here, a diaphragm 88c existing between the negative and positive electrodes is divided into a plurality of portions, and an ultraviolet fluorescent lamp 90A is arranged between the plurality of portions (see FIG. 7A). Further, ultrasonic motors (so-called traveling wave motors) are arranged on the inlet side and the outlet side of the electrolysis unit 88, respectively, so as to accelerate the upward water flow in the figure.

Although the pool water purifying apparatus of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various changes and improvements are made without departing from the gist of the present invention. Of course it is good.

For example, a xenon lamp may be used instead of the sterilizing ultraviolet lamp. In this case, not only the xenon gas alone but also a mixed xenon lamp in which xenon gas and argon gas are used in a mixed state can be suitably used.

[0088]

As described above, according to the present invention,
Notably, the ability required for a purification treatment apparatus such as filtration, sterilization, adsorption purification, etc. of impurities contained in pool water is suitably satisfied, and the pool water purification treatment apparatus can be operated at low cost. It is effective.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing an example of a pool water purification treatment system using a pool water purification treatment device according to one embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a specific example of the pool water purification treatment apparatus of the present invention shown in FIG.

FIGS. 3A and 3B are a top view and a cross-sectional view, respectively, showing an example of a porous ceramic filter used in the pool water purification treatment apparatus of the present invention shown in FIG.

FIG. 4 is a top view and a sectional view showing another example of the porous ceramic filter used in the pool water purification treatment apparatus of the present invention shown in FIG.

FIGS. 5A to 5C are explanatory diagrams of an electrode arrangement of an electrolysis unit 88. FIGS.

FIG. 6 is a schematic partial view (part 1) showing another specific example of the pool water purification treatment apparatus of the present invention shown in FIG. 1, and is a cross-sectional view.

FIG. 7 is a schematic partial view (part 2) showing another specific example of the pool water purification treatment apparatus of the present invention shown in FIG. 1, (a).
Is a top view, and (b) is a sectional view.

[Explanation of symbols]

 Reference Signs List 10 Pool water purification treatment device 12 Pool 14 Overflow tank 16 Prefilter 18 Pump 20 Ceramic filter 22 Filtration aid supply unit 24 Chlorine tank 26 Ultrafiltration device 42 Cylindrical body of ceramic filter 42a Outer peripheral surface of ceramic filter 42b Ceramic filter Inner peripheral surface 42c Thick portion of ceramic filter 43 Through hole of ceramic filter 44 Center through hole of ceramic filter 46 Ceramic filter membrane cell of ceramic filter 47 Communication flow channel of ceramic filter 84 Microfiltration portion 84a, 84b, 86a Valve 86 Adsorption Purification unit 88 Electrolysis unit 88a Anode 88b Cathode 88c Diaphragm 88d Ultrasonic oscillator 90 Sterilization unit 90A Ultraviolet fluorescent lamp 92 Mixing unit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C02F 1/28 C02F 1/50 510A 1/50 510 520L 520 531M 531 560Z 560 560B 560E 560E 560F 9/00 502D 9 / 00 502 502M 502Z 502H 503Z 503 504B 504 B01D 35/02 GF term (reference) 4D019 AA03 BA03 BA05 BB01 BC06 CA03 CB10 4D024 AA06 AB11 AB13 BA01 BA02 BA07 DB01 DB03 DB05 DB09 4D061 DA07 FA10 AA11 BF31 BF39 BF40 4D066 CA01 CA02 CA05 CA15

Claims (12)

[Claims] 1. A pool water purification treatment method having at least a filtration step, characterized by comprising a pool water electrolysis step after the filtration step after the filtration step. 2. The method according to claim 1, further comprising the step of sterilizing the pool water after the filtration step, wherein the pool water after the sterilization step is electrolyzed by the electrolysis step. 2. The pool water purification method according to 1. 3. The method according to claim 1, further comprising a step of adsorbing and purifying the pool water after the filtration step and the sterilizing step, wherein the pool water after the adsorption and purifying step is electrolyzed by the electrolysis step. The pool water purification treatment method according to claim 2, wherein: 4. The pool water purification method according to claim 1, further comprising a step of adding a chlorine preparation for disinfection in at least one of a preceding stage and a subsequent stage of the electrolysis step. . 5. The pool water purification method according to claim 1, wherein the filtration step is performed using a porous ceramic filter. 6. The pool water purification method according to claim 5, wherein the filtering step is performed by applying a precoat containing activated carbon to the porous ceramic filter. 7. A pool water purification treatment apparatus having at least a filtration means, characterized by having a pool water electrolysis means after the filtration step after the filtration means. 8. The method according to claim 1, further comprising a sterilizing means for the pool water having been subjected to the filtration step after the filtration means, wherein the pool water having been sterilized by the sterilizing means is electrolyzed by the electrolyzing means. Item 8. A pool water purification treatment apparatus according to item 7. 9. A pool water adsorbing and purifying means which has completed the filtration and sterilizing steps by the filtering means and the sterilizing means is provided at a stage subsequent to the sterilizing means, and the pool water which has been subjected to the adsorbing and purifying step by the adsorbing and purifying means is used as the electric power. The pool water purification treatment apparatus according to claim 8, wherein electrolysis is performed by decomposition means. 10. The pool water purification treatment apparatus according to claim 7, further comprising a disinfecting chlorine preparation adding means in at least one of a preceding stage and a succeeding stage of said electrolytic means. . 11. The filter according to claim 7, wherein said filtering means comprises a porous ceramic filter.
The pool water purification treatment apparatus according to any one of claims 10 to 10. 12. As the porous ceramic filter,
A cylindrical body having an outer peripheral surface that contacts the pool water before the purification treatment and an inner peripheral surface that defines a central through-hole through which the pool water flows before the purification treatment, and an outer peripheral surface and an inner peripheral surface of the cylindrical body. The pool water purification treatment apparatus according to claim 11, wherein a cylindrical porous ceramic filter having a plurality of through holes through which the pool water after the purification treatment flows flows in a thick portion between the pools. .