JPH11138177A - Bathwater cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably clean bathwater in a short time without being affected by the change in concn. of a contaminant particle by measuring the concn. of the metal eluted from a flocculating means with a detecting means and controlling the current applied to the flocculating means. SOLUTION: When the aluminum hydrate formed from aluminum ion eluted from the aluminum anode of a flocculating means 16 reaches a first eluted aluminum concn. detecting means 22, the concn. is detected by the means 22, and the concn. data are sent to a flocculation control means 35. The optimum concn. of the eluted aluminum corresponding to the turbidity data read out of a second storing means 33 and the concn. data of the aluminum hydrate in the bathwater are compared by the flocculation control means 35. When the aluminum hydrate concn. is insufficient to the turbidity of the bathwater, the current to the electrode of the flocculating means 16 is increased, and the current to the electrode is decreased when the concn. is in excess.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath water purifying apparatus for purifying bath water for business use or home use.

[0002]

2. Description of the Related Art Conventional bath water purifying apparatuses of this type include:
Metal ions generated by electrolysis by metal electrodes are eluted, suspended particles contained in the bath water are cross-linked to increase the size of the particles, and then filtered using filtration means and simultaneously circulated and kept warm by water temperature control means. (See, for example,
-117737 gazette).

The conventional technique will be described with reference to FIG. In FIG. 5, 1 is a bathtub, 2 is a circulation pump for circulating bath water, 3 is a circulation circuit, and 4 is an aggregating means for aggregating dirt particles contained in the bath water by electrolyzing aluminum to elute aluminum ions. is there. 5 is a filtration means for filtering water containing aggregated dirt particles, 6 is a water temperature control means for controlling the water temperature, 7 is a pH control means for keeping the pH of the water at 6 to 8, and 8 is a bacterium contained in the water. It is a sterilization means for performing sterilization.

In this configuration, when the circulation pump 2 is operated, the water in the bathtub 1 circulates in the circulation circuit 3. At this time, while the pH of the circulating water is adjusted by the pH control means 7, the aggregating means 4 is operated to electrolyze aluminum and elute aluminum ions. When the aluminum ions are eluted, the dirt particles contained in the water are aggregated to form flocs. Further, the water containing the floc is configured to be filtered by the filtration means 5, sterilized by the sterilization means 8, heated by the water temperature control means 6, and returned to the bathtub 1.

[0005]

In a conventional bath water purifying apparatus, when the concentration change of the dirt particles is relatively small, the dirt particles contained in the bath water are aggregated by eluting a certain concentration of metal ions. And could be filtered. But,
The actual concentration of dirt particles in the bath water varies greatly before and after bathing. To cope with this, a method of controlling the coagulation start time with a timer has also been implemented, but if several people take a continuous bath, the number of people who took a bath, the bathing time per person and whether or not the bath water is used etc. The change in the concentration of dirt particles is greatly affected by the bathing method. Therefore, it is difficult to obtain stable purification performance in a short time only by constantly eluting a constant concentration of metal ions.

[0006]

In order to solve the above-mentioned problems, the present invention comprises a circulating circuit for circulating the water to be purified, a coagulating means, a dissolved metal concentration detecting means and a filtering means provided downstream thereof. is there. According to the above invention, the concentration of the metal eluted from the aggregating means is measured by the eluted metal concentration detecting means, and the current supplied to the aggregating means is controlled to stably elute the metal at a constant concentration in the bath water. And stable purification can be performed in a short time without being affected by a change in the concentration of dirt particles.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A bath water purifying apparatus according to a first aspect of the present invention includes a circulation circuit for circulating bath water to be purified, a circulating means for circulating bath water, and a suspension circuit included in the bath water. An aggregating means for aggregating suspended substances by a metal compound; a filtering means provided downstream of the aggregating means for filtering the agglomerated substance formed by the aggregating means; and detecting a concentration of a metal eluted from the aggregating means. This is provided with an elution metal concentration detecting means.

Then, the concentration of the metal eluted from the aggregating means is detected by the eluted metal concentration detecting means. The eluted metal forms a hydrate by interaction with water molecules. The metal hydrate is slightly positively charged and electrically couples with the negatively charged dirt particles to neutralize the surface charge. The potential of the charge on the surface of the metal hydrate or the dirt particles in water is called an electrokinetic potential (or zeta potential). When an excessive concentration of metal is eluted from the aggregating means, the surface of the agglomerated substance has a large amount of positive charges due to the metal hydrate, and the agglomerated substances repel each other, re-disperse, and cannot be removed by the filtering means. . On the other hand, if the concentration of the eluted metal is too low, the surface charge of the agglomerated substance is not sufficiently neutralized and the agglomeration becomes insufficient, so that it cannot be removed by the filtration means.

The concentration of metal eluted from the aggregating means is detected by the eluted metal concentration detecting means, and excessive or insufficient elution of the metal from the aggregating means is prevented, and a stable concentration of the metal is eluted, whereby the contamination in the bath water is prevented. The agglutination reaction of the particles can be stabilized, and rapid removal of the agglutinated substances by the filtration means enables rapid purification of the bath water.

[0010] The bath water purifying apparatus according to claim 2 of the present invention comprises:
A metal electrode for eluting metal ions is provided in the aggregating means.

Then, the current flowing through the metal electrode is increased or decreased to electrochemically control the concentration of the dissolved metal. At this time, the amount of metal eluted from the surface of the metal electrode is determined by the current flowing between the electrodes according to Faraday's law, regardless of the shape of the electrode, the area between the electrodes, the distance between the electrodes, and the like. Therefore,
By controlling the current flowing between the metal electrodes and detecting the concentration of the metal eluted from the electrodes by the eluted metal concentration detection means, it is possible to more precisely control the concentration of the eluted metal, stabilize the agglutination reaction, and rapidly Bath water purification becomes possible.

A bath water purifying apparatus according to a third aspect of the present invention comprises:
In this method, aluminum is used as a metal positive electrode and a dissolved aluminum concentration detecting means for detecting the concentration of the dissolved aluminum is provided.

The dissolution rate in bath water can be increased by using aluminum, which has a relatively high ionization tendency among metals, as the positive electrode material. In addition, by detecting the concentration of aluminum eluted in the bath water by the eluted aluminum concentration detection means and controlling the current between the electrodes, it is possible to precisely control the amount of aluminum eluted and stabilize the agglutination reaction of dirt particles. As a result, rapid purification can be achieved by removing agglomerated substances by the filtration means.

[0014] The bath water purifying apparatus according to claim 4 of the present invention comprises:
The elution metal concentration detecting means is provided downstream of the aggregating means and upstream of the filtering means.

By providing the eluted metal concentration detecting means downstream of the aggregating means and upstream of the filtering means, dirt particles are agglomerated in the bath water containing the metal eluted through the aggregating means and removed by the filtering means. The concentration of the metal previously eluted in the bath water will be detected. Therefore, the metal concentration in the bath water can be accurately detected without being removed by filtration, and the concentration of the eluted metal can be quickly increased or decreased, and the bath water can be rapidly purified.

The bath water purifying apparatus according to claim 5 of the present invention comprises:
The eluted metal concentration detecting means is provided either upstream of the aggregating means or downstream of the filtering means or both.

The eluted metal concentration detecting means detects the concentration of the metal eluted from the aggregating means and passed through the filtering means or once captured by the filtering means and leaked into the bath water again. The coagulated substance generated by the coagulation of the metal and the dirt particles eluted from the coagulation means is quickly captured in the filter medium gap of the filtration means at the start of filtration. However, as the amount of coagulated material trapped in the filter medium gap increases, the diameter of the gap in the filter medium decreases, and the flow rate of the bath water gradually increases. Further, when the amount of trapped flocculant increases and becomes saturated, the flocculant in the bath water passes through the filter medium. At the same time, the shearing force due to the bath water passing through the filter medium gap increases, and the agglomerated substances trapped in the filter medium gap are separated and redispersed in the bath water. As a result, the eluted metal concentration in the bath water that has passed through the filtering means starts to increase. By detecting the concentration of the eluted metal by the eluted metal concentration detecting means, it becomes possible to detect the timing of clogging of the filter medium, and it is possible to carry out the regeneration of the filter means by replacing the filter medium or backwashing in a timely manner. In addition, it is possible to prevent the filtering means from being used in a state where the performance of removing the coagulated substance is reduced.

The bath water purifying apparatus according to claim 6 of the present invention comprises:
A turbidity detecting means is provided. Then, the turbidity detecting means detects turbidity due to dirt particles in the bath water sucked into the bath water purification device. When the concentration of dirt particles contained in the bath water is high, the turbidity of the bath water increases, and conversely, when the concentration of dirt particles is low, the turbidity decreases. Therefore, by detecting the turbidity of the bath water by the turbidity detecting means and performing aggregation by the metal eluted from the aggregating means, a metal having a concentration suitable for the concentration of the dirt particles contained in the bath water is supplied from the aggregating means. Then, the agglutination reaction can be stabilized, and rapid purification of bath water becomes possible.

The bath water purifying apparatus according to claim 7 of the present invention comprises:
A washing means for washing the clogging of the filtration means due to the accumulation of coagulated or suspended substances by backwashing, and an outlet for discharging washing water used for washing out of the circulation circuit, and turbidity detection upstream of the outlet. Means are provided.

Then, the dirt particles are aggregated by the aggregating means and the agglomerated substance is filtered by the filtering means. When the filtering means is clogged, backwashing is performed. The washing means backwashes the clogged filtering means, and the washing water is discharged from the outlet to the outside of the bath water purification device. At the time of this backwashing, the turbidity of the washing water used for washing before discharge is detected by the turbidity detecting means. At the start of the backwashing, the coagulated substance clogging the filtration means is contained in a large amount in the washing water, and its turbidity increases. However, as the backwashing proceeds, the amount of agglomerated substances in the filtering means decreases and the amount contained in the washing water also decreases, so that the turbidity detected by the turbidity detecting means decreases and finally the regeneration of the filtering means is completed. . Thus, by detecting the turbidity of the washing water by the turbidity detecting means at the time of backwashing, regeneration of the filtering means clogged by aggregation and filtration can be completed in a minimum necessary time.

The bath water purifying apparatus according to claim 8 of the present invention comprises:
It is provided with a pH changing means for changing the pH of the bath water.

Fine particles such as colloids existing in water generate an electrokinetic potential at the interface between the surface and water, and the electrokinetic potential changes depending on the pH of the water. The cohesive force of the metal hydrate formed in water by the metal eluted by the coagulation means changes depending on the pH. For example, when aluminum is selected as the metal, the pH needs to be maintained at 4 to 5 so that aluminum hydrate is formed in water and the aluminum hydrate is in the most cohesive state. Out of this range, the cohesive strength is reduced, and an insoluble substance is formed or conversely completely dissolved to lose the cohesive strength. The pH changing means changes or maintains the pH of the bath water, whereby the pH of the bath water can be changed and maintained so that the cohesive force of the metal eluted from the aggregating means can be sufficiently exhibited.

The bath water purifying apparatus according to claim 9 of the present invention comprises:
An electrokinetic potential detecting means for detecting an electrokinetic potential of a suspended substance is provided.

The electrokinetic potential detecting means detects the electrokinetic potential of the coagulated substance formed from the metal eluted by the coagulating means and the dirt particles. The metal eluted from the aggregating means forms a metal hydrate and binds to the dirt particles to neutralize its electrokinetic potential and form an agglomerated substance approaching zero. When the electrokinetic potential of the coagulated substance is in the range of −10 mV to +10 mV, the coagulated substances can be bonded to each other by Van der Waals force, and a larger agglomerate (hereinafter referred to as floc)
To facilitate removal by filtration means. However, the electrokinetic potential of this agglomerated substance changes depending on the pH of surrounding water.
Filtration means as a large floc formed by changing the pH of the bath water containing the flocculant by the pH variable means and stabilizing the electrokinetic potential of the flocculent substance close to zero, thereby further promoting the bonding between the flocculants. And the bath water can be easily removed, and rapid purification of bath water becomes possible.

[0025] The water purifying apparatus according to claim 10 of the present invention comprises:
It is provided with a temperature detecting means for detecting the temperature of the bath water and a temperature variable means for increasing or decreasing the temperature of the bath water.

The metal hydrate produced from the metal eluted from the aggregating means changes its aggregating power depending on the temperature. 30-4
In the range of 0 ° C., the cohesive strength of the metal hydrate does not change much, but the cohesive strength decreases from 45 ° C. or higher. The temperature changing means changes and maintains the temperature of the bath water, but by maintaining the temperature at which the cohesive force of the metal hydrate does not significantly decrease, the coagulation reaction can be performed stably, and the stable bath water purification performance Can be obtained.

[0027]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a bath water purification device according to a first embodiment of the present invention, FIG. 2 is a block diagram of the bath water purification device, and FIG.
FIG. 4 is a graph showing the relationship between the pH and the electrokinetic potential of the coagulating substance, and FIG. 4 is a diagram showing a change in turbidity of the bath water and a control pattern of the coagulating means.

This will be described with reference to FIG. 9 is a bathtub.
Reference numeral 10 denotes a circulation pump which also serves as a circulation means and a backwash means. The circulation circuit 11 is a water circulation path in which bath water in the bathtub 9 flows into the purifier through the suction port 12 and returns from the discharge port 13 to the bathtub 9 again. Reference numeral 14 denotes a temperature variable unit provided in the circulation circuit 11. Reference numeral 15 denotes second turbidity detecting means provided in the circulation circuit 11 upstream of the aggregating means 16. The aggregating means 16 is provided in the circulation circuit 11 downstream of the electromagnetic three-way valve 17 and includes an aluminum positive electrode 16a and a cathode 16b inside. 18 is a pH variable means provided in the circulation circuit 11 upstream of the aggregating means 16,
The bath water is electrolyzed so that the electrolytic water on the anode side flows into the circulation circuit 11 and the electrolytic water on the cathode side is connected to the bypass passage 20 via a check valve. This bypass 20
Branches off from the circulation circuit 11 through the electromagnetic three-way valve 17 and merges with the circulation circuit 11 again upstream of the first electromagnetic two-way valve 21. Reference numeral 22 denotes a first eluted aluminum concentration detecting means provided in the circulation circuit 11 downstream of the aggregating means 16 and upstream of the filtering means 23. Reference numeral 24 denotes a temperature detecting unit provided in the circulation circuit 11 downstream of the aggregating unit 16 and upstream of the filtering unit 23. Reference numeral 25 denotes an electrokinetic potential detecting means provided in the circulation circuit 11 downstream of the aggregating means 16 and upstream of the filtering means 23. Reference numeral 26 denotes a second eluted aluminum concentration detecting means provided downstream of the filtering means 22 and upstream of the junction of the bypass path 19 and the circulation circuit 11.
Reference numeral 27 denotes a drainage passage branched from the circulation circuit 11 at a position downstream of the aggregating means 16 and upstream of the filtering means 23. When the second electromagnetic two-way valve 28 is opened, the drainage passage 27 is connected to the outside of the purifying device via a discharge port 29. Drain the water. 30 is a second electromagnetic two-way valve 2
This is the first turbidity detecting means provided in the drainage channel upstream of 8.

Next, each control means and storage means will be described with reference to FIG. Reference numeral 31 denotes a display means which also functions as an input means which can be operated from the outside. Reference numeral 32 denotes first storage means for storing information on conditions at the time of switching between filtration and backwashing. 33
Is a second storage means for storing information relating to the control of the aggregation means. Reference numeral 34 denotes third storage means for storing information relating to control of the pH variable means. Reference numeral 35 denotes an aggregation control unit that controls the aggregation unit 16 based on the information in the second storage unit 33. 36
Is a circulation control means for controlling the switching of the water path based on the information in the first storage means 33. 37 is a pH control means for controlling the pH variable means based on the information in the third storage means. 3
Reference numeral 8 denotes a temperature control unit that controls the temperature variable unit 14.

Next, the operation and operation at the time of filtration will be described with reference to FIG. The display means 31 displays the operating status of the bath water purification device and, at the same time, sends input information by key operation to the circulation control means 35. When the power of the apparatus is turned on by operating a key provided on the display means 31, an operation signal is sent to the circulation control means. The circulation control means 36 operates the circulation pump 10 in response to an operation signal from the display means 31. The circulating pump 10 in the present embodiment also serves as a circulating unit and a washing unit, and the water contact portion is made of a material that does not corrode with water. There is no particular limitation on the specifications as long as it can be used without any problem in configuration. The circulation control means 36 further activates the coagulation control means 35 and the temperature control means 38 to switch the opening direction of the electromagnetic three-way valve 17 to the filtration circulation direction, and to the discharge port 13 to the bath 9 of the purified bath water. Subsequently, the first electromagnetic two-way valve 21 is opened, and the second electromagnetic two-way valve 28 following the outlet 29 for discharging the washing water at the time of backwashing is closed. These valves need not be corroded by water, and their specifications are not particularly limited. The activated aggregation control means 34 activates the pH control means 36,
The second turbidity detecting means 15 for detecting the turbidity in the bath water and the first eluted aluminum concentration detecting means 22 for detecting the concentration of aluminum hydrate are activated, and the aluminum positive electrode provided in the aggregating means 16 is detected based on the detected data. The current flowing between the electrode 16a and the cathode 16b is controlled. The activated pH control means 37, based on the detection data of the electrokinetic potential of the aggregated substance detected by the electrokinetic potential detection means 25,
8 control the pH of the bath water. By this operation of the apparatus, the bath water enters the inside of the apparatus through the suction port 12 in FIG. 1 and the circulation pump 10 starts circulation of the circulation circuit 11.

By taking a bath, the bath water is turned into hair, skin pieces, sebum,
The turbidity of the bath water increases due to contamination by proteins, bacteria, and the like.
When the bath water whose turbidity has increased flows into the circulation circuit 11 from the suction port 12 and reaches the second turbidity detecting means 15, the second turbidity detecting means 15 detects the turbidity. If the suction port 12 is provided with a filtering member capable of removing relatively large stains such as hair and skin fragments in the bath water, unnecessary contamination of the inside of the purification device main body can be prevented, which is preferable. The turbidity data detected by the second turbidity detecting means 15 is sent to the aggregation control means 35.
The coagulation control means 35 compares the turbidity data from the second turbidity detecting means 15 with the turbidity upper limit value read from the second storage means 33, and if the turbidity data is not less than the turbidity upper limit value, Measure the time from. The second storage means 33 stores a turbidity upper limit value, a turbidity continuation limit time at which turbidity exceeding the turbidity upper limit value is continued, and it is determined that purification of bath water by coagulation is necessary,
The optimum concentration of the eluted aluminum that is optimum for the turbidity of the bath water detected by the second turbidity detecting means 15 and the lower turbidity limit value, which is the turbidity at which the bath water is purified and coagulation is not required, are stored. When the time when the turbidity data of the bath water exceeds the turbidity upper limit exceeds the continuation limit time read from the second storage means 33, the pH control means 37 is activated and at the same time, the electrode of the coagulation means 16 is energized. Start. As a result, aluminum ions are eluted from the aluminum positive electrode 16a of the aggregation means 16, and the aluminum ions react with water molecules to form aluminum hydrate. The elution of this aluminum ion from the aluminum positive electrode follows Faraday's law,
It is determined by the current flowing between the electrodes without being affected by the facing area between the electrodes, the distance between the electrodes, and the shape of the electrodes. However, when a constant current is passed between the electrodes, the elution amount of aluminum is
6a depends on the purity of the aluminum. Therefore, the aluminum purity of the aluminum positive electrode 16a is preferably at least 90%, more preferably at least 99%. In addition, the cathode 16b is not particularly limited as long as it does not cause a problem such as corrosion due to electrolysis in water. When the aluminum hydrate formed from the aluminum ions eluted from the aluminum positive electrode 16a reaches the first eluting aluminum concentration detecting means 22, the first eluting aluminum concentration detecting means 22 detects the concentration and aggregates the concentration data. It is sent to the control means 35. The coagulation control means 35 compares the value of the optimum concentration of the eluted aluminum corresponding to the turbidity data read from the second storage means 33 with the aluminum hydrate concentration data of the bath water. If the aluminum hydrate concentration is insufficient with respect to the turbidity of the bath water, the current to the electrode of the aggregating means 16 is increased, and if the aluminum hydrate concentration is excessive, the current to the electrode is increased. By reducing the current, it is possible to always supply the aluminum hydrate having the optimum concentration with respect to the turbidity in the bath water from the flocculation means 16. This aluminum hydrate has a slightly positive electrokinetic potential. Soil particles in the negatively charged bath water electrostatically combine with the aluminum hydrate to form aggregates. At this time, if the aluminum hydrate concentration eluted from the aggregating means 16 is excessive, the dirt particles are covered with the aluminum hydrate, and the formed flocs are all positively charged and electrostatically repel each other. Therefore, flocculation does not proceed, and the formed flocs are small and cannot be removed by the filtration means 23, so that the bath water does not decrease in turbidity and may rise in some cases. Conversely, if the aluminum hydrate concentration is too low, the formed flakes cannot be cross-linked due to insufficient aluminum hydrate adhering to the dirt particles and aggregation will not proceed. The turbidity of the bath water does not decrease without being as large as possible. Therefore, by controlling the aluminum hydrate concentration to the optimum concentration with respect to the turbidity, suspended substances in the bath water can be quickly removed by the filtration means 23 and the turbidity of the bath water can be reduced in a short time. . On the other hand, the activated pH control means 37 receives the electrokinetic potential data of the coagulated substance detected by the electrokinetic potential detection means 25, and stores the electrokinetic potential upper limit value and the electrokinetic potential stored in the third storage means 34. Read the lower limit and compare. The upper limit value of the electrokinetic potential is an upper limit value at which the agglomerated substance has a slightly positive charge and the agglomerated substances can be bonded to each other by van der Waals force. The lower limit value of the electrokinetic potential is a lower limit value at which the agglomerated substance has a slight negative charge and the agglomerated substances can be bonded to each other by van der Waals force. When the electrokinetic potential deviates from the range of the upper limit value and the lower limit value, the coagulated substances electrostatically repel each other due to the electrokinetic potential,
No binding of the aggregated substances occurs due to the Van der Waals force, and the particles pass through the filtering means 23 without becoming large, so that the bath water cannot be purified. The electrokinetic potential of this agglomerated substance changes with pH. FIG. 3 shows the relationship between the pH and the electrokinetic potential of the aggregated substance. As shown in this figure, the electrokinetic potential of the aggregated substance changes from negative to positive at pH 2-3, shows a maximum value near pH 5, and decreases again. The electrokinetic potential at which cohesive substances can be bound by Van der Waals force is −
It is in the range of about 10 mV to +10 mV, and if deviated, the coupling becomes weak. The pH of the bath water is usually in the range of about 6 to 9, and within this range, the pH is adjusted so that the electrokinetic potential approaches zero.
In the case where is controlled, the optimum conditions can be set for the binding between the aggregated substances. Therefore, the pH control means 37 operates the pH variable means 18 so as to increase the pH when the electrokinetic potential of the coagulated substance detected by the electrokinetic potential detection means 25 is lower than the lower limit value of the electrokinetic potential. Conversely, when the electrokinetic potential of the coagulated substance exceeds the upper limit value of the electrokinetic potential, the pH variable means 18 is operated so as to lower the pH. If the electrokinetic potential of the coagulated substance is in the range between the lower limit value of the electrokinetic potential and the upper limit value of the electrokinetic potential, the function of the pH variable means 18 is stopped. The pH variable means 18 has a cathode, an anode, and a diaphragm between both electrodes in the internal water contact part. By controlling the water pH in this way, the electrokinetic potential of the aggregated substance can be adjusted to an appropriate range, and the bonding between the aggregated substances can be promoted. The aluminum hydrate associated with the dirt particles also binds to other dirt particles,
Since the cohesive substances are also bonded to each other by the Waals force, the cohesive substances gradually become large aggregates called flocs, and can be quickly removed by the filtering means 23 provided downstream of the aggregating means 16. The filtering means 23 has a filter medium inside, and captures aggregated substances in the filter medium gap. For example, a filter of a wound type such as cotton or a pleated type or a hollow fiber type, or a porous plastic molded product can be used as the filter medium.However, it is difficult to recover performance due to backflow cleaning. Because of its simplicity, a disposable use method that is replaced when clogged is suitable. In the case where a filter medium regeneration method by backwashing is adopted, a molded body such as a ball or a plate molded from an inorganic component such as ceramic or glass such as alumina or a granular material such as river sand is preferable. The diameter is preferably from 0.001 to 1.0 mm. The turbidity data collected when the turbidity-reduced bath water flows into the circulation circuit 11 and reaches the second turbidity detecting means 15 is stored in the turbidity data read from the second storage means 33. When it is lower than the lower limit value, the power supply to the electrodes of the aggregating means 16 is stopped, and the elution of aluminum ions from the aluminum positive electrode 16a stops. At the same time, the function of the pH control means 37 is stopped. Thereby, the aggregating means 1
6 can be prevented from being eluted unnecessarily, and the aluminum positive electrode 16a can be used economically.

Next, the operation and action during backwashing will be described.
When the filtration of the bath water is continued as described above, the filtering means 2
The filter media is clogged by the accumulation of aluminum hydrate or flocs of aluminum hydrate and dirt particles on the filter material 3, and the pores in the filter media are narrowed, the flow rate of the bath water passing therethrough is increased, and at the same time the shearing force is increased. Increase. As a result, the substance trapped in the pores of the filter medium is peeled off by the shearing force of the bath water, and the trapping of the substance by the filter medium becomes impossible, so that the filtration performance of the filtration means 23 is reduced. Will leak out. At this time, since the elution of aluminum hydrate from the aggregating means 16 continues, the concentration of aluminum hydrate in water increases more rapidly than the concentration of other substances. When the water having the increased aluminum hydrate concentration reaches the second eluted aluminum concentration detection means 26 provided downstream of the filtration means 23, the second eluted aluminum concentration detection means 26 collects the concentration data and performs circulation control means 36. Send to The circulation control means 36 compares the concentration data with the aluminum hydrate concentration upper limit value read from the first storage means 32, and if the concentration data is equal to or higher than the upper limit value, the first electromagnetic two-way valve 21 is activated. The closing second electromagnetic two-way valve 28 is opened, and the opening direction of the electromagnetic three-way valve 17 is changed to the backwash direction. As a result, a water flow in a direction opposite to that at the time of filtration is given to the filtration means 23, and the deposited material is washed away by the water flow, flows out of the filtration means 23, and is finally discharged together with water from the discharge port 29. During this backwashing, the first turbidity detecting means 30 provided upstream of the discharge port 29 collects turbidity data in the wastewater due to the material washed and removed from the filter medium, and the circulation control means 36
Send to When the backwashing is continued, the substances in the filter medium are gradually removed, and the turbidity in the wastewater decreases. Circulation control means 3
6 compares the drain turbidity data sent from the first turbidity detecting means 30 with the backwashing stop turbidity read out from the first storage means 32, and the wastewater turbidity has decreased to be equal to or less than the backwashing removal stop turbidity. At this time, the electromagnetic three-way valve 17 is set to the filtration circulation path, the first electromagnetic two-way valve 21 is opened, and the second electromagnetic two-way valve 28 is closed to change the water path from the back washing path to the filtration circulation path. I do. Further, the aggregation control means 35 is restarted. After performing such backwashing, the filtration means 23 has reduced water flow resistance, and can be restored to a high filtration performance equivalent to that at the start of use.

FIG. 4 is a chart showing the change over time in the turbidity of the bath water when the bath water is purified using the bath water purifying apparatus and the corresponding current value of the electrode of the aggregating means 16. As shown in FIG. 4, the turbidity of the bath water starts increasing at the same time as the start of bathing, and reaches the upper turbidity limit at time t1 in the figure. At this time, time measurement by the aggregation control means 35 starts. The turbidity further increases, but gradually increases almost at the same time as the end of bathing.
At the time point t2, when the turbidity continuation limit time is reached, the aggregation control means 35 controls the aggregation means 16 so that the aluminum hydrate concentration optimal for the turbidity read from the second storage means 33 is eluted from the aggregation means 16. At the same time as the energization of the electrodes is started, the pH control means 37 is activated to start controlling the pH. In this figure, t2-t1 is the turbidity continuation limit time. By setting this turbidity continuation limit time, particles that can be sufficiently captured and removed by the filtration means without needing to mix air bubbles at the time of bathing and to coagulate dirt, sand, dust, etc. of skin pieces etc. When aluminum is mixed, wasteful elution of aluminum from the aggregation means 16 can be prevented. Aluminum is eluted from the positive electrode 16a in the aggregating means 16 by the start of energization of the electrode of the aggregating means 16, and aluminum hydrate is generated. The concentration of this aluminum hydrate is determined by the first eluted aluminum concentration detecting means 22. The detected concentration data is sent to the aggregation control means 35. Coagulation control means 35
Increases the current to the electrode of the aggregating means 16 so that the concentration of aluminum hydrate becomes the optimum concentration with respect to the turbidity of the bath water, and makes the current constant when the concentration reaches the optimum concentration. The aluminum hydrate generated by the aggregating means 16 starts to aggregate with the dirt particles contained in the bath water. At this time, the electrokinetic potential detecting means 25 detects the electrokinetic potential of the generated aggregated substance and sends the data to the pH control means 37. pH control means 3
Numeral 7 controls the pH variable means 18 so that the electrokinetic potential of the coagulated substance is in a range between the lower limit value and the upper limit value of the electrokinetic potential read from the third storage means 34. By this pH control, the flocculants bind to each other due to Van der Waals forces to form larger flocs. When the bath water containing the floc passes through the filtering means 23, the floc is captured and removed by the filter medium, the turbidity is reduced, and the bath water returns to the bathtub 9. Although the turbidity of the bath water gradually decreases due to the flocculation filtration, the flocculation control means 35 to which the turbidity data is sent from the second turbidity detecting means 15 which has detected the change in the turbidity is suitable for the turbidity. In order to make the aluminum hydrate concentration, the current of the electrode of the aggregation means 16 is also reduced. As a result, the concentration of aluminum hydrate generated in the aggregating means 16 decreases following the change in turbidity. The turbidity of the bath water continues to decrease, and drops below the lower turbidity limit at time t3. The turbidity at this time is detected by the second turbidity detecting means 15, and the data is sent to the coagulation control means 35.
The pH control by the control means 37 is stopped. By such control of the coagulation filtration, the turbidity can be promptly reduced in response to a sudden increase in the turbidity of the bath water due to bathing without unnecessary elution of aluminum.

[0035]

As described above, in order to efficiently aggregate the dirt particles in the bath water, a metal hydrate suitable for the concentration of the dirt particles in the bath water is supplied from the aggregating means under optimum conditions. It is necessary to perform an agglutination reaction. The bath water purifying apparatus according to claim 1 of the present invention can detect and control the concentration of the metal eluted from the aggregating means by providing the eluted metal concentration detecting means, so that the metal hydrate having a constantly stable concentration can be detected. And a stable purification performance can be obtained.

In the bath water purifying apparatus according to the second aspect, by providing the metal electrode in the aggregating means, it is possible to precisely control the concentration of the metal eluted from the aggregating means by controlling the current flowing between the electrodes.

In the bath water purifying apparatus according to the third aspect, by using aluminum for the metal positive electrode and providing the eluted aluminum concentration detecting means, it becomes possible to quickly elute an appropriate concentration of aluminum from the electrode. As a result, it is possible to more precisely control the agglutination reaction.

In the bath water purifying apparatus according to the fifth aspect, by providing the eluted metal concentration detecting means upstream of the aggregating means or downstream of the filtering means, the metal hydrate can pass through the filtering means due to clogging of the filtering means. Leakage from the filtration means can be quickly detected, and the time when regeneration of the filtration means is necessary can be easily known.

In the bath water purifying apparatus according to the sixth aspect, the provision of the turbidity detecting means enables the concentration of the dirt particles in the bath water to be eluted from the aggregating means to the optimum concentration of the metal, and the rapid purifying performance is improved. Obtainable.

In the bath water purifying apparatus according to the seventh aspect of the present invention, by providing the washing means for backwashing the filtration means and the means for detecting the turbidity of the washing water at the time of backwashing, it is possible to carry out backwashing in a minimum time. It becomes possible.

In the bath water purifying apparatus according to the eighth aspect, by providing the pH variable means, the cohesive force of the metal hydrate derived from the coagulating means can be maintained at a high pH, and rapid purification can be performed. .

In the bath water purifying apparatus according to the ninth aspect, by providing the electrokinetic potential detecting means, it is possible to maintain the electrokinetic potential of the agglomerated substance composed of the metal hydrate and the contaminated particles in a range that promotes the agglutination reaction. It becomes possible.

In the bath water purifying apparatus according to the tenth aspect, by providing the temperature detecting means and the temperature varying means, the cohesive force of the metal hydrate can be maintained at a high temperature, and rapid purification can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a bath water purification device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a bath water purification device.

FIG. 3 is a graph showing the relationship between the pH and the electrokinetic potential of the aggregated substance.

FIG. 4 is a diagram showing a change in turbidity of bath water and a control pattern of a coagulation unit.

FIG. 5 is a schematic configuration diagram of a conventional water purification device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Circulation pump 11 Circulation circuit 14 Temperature variable means 15 Second turbidity detecting means 16 Aggregating means 16a Aluminum positive electrode 18 pH variable means 22 First eluting aluminum concentration detecting means 23 Filtration means 24 Temperature detecting means 25 Electrokinetic potential detecting means 26 Second elution aluminum concentration detecting means 29 Outlet 30 First turbidity detecting means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yu Kawai 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (10)

[Claims] A circulating circuit for circulating bath water to be purified, a circulating means for circulating the bath water, an aggregating means for aggregating suspended substances contained in the bath water with a metal compound, and the aggregating means A bath water purification apparatus provided downstream of the apparatus and provided with a filtration means for filtering the aggregated substance formed by the aggregation means, and an eluted metal concentration detection means for detecting the concentration of the metal eluted from the aggregation means. 2. The bath water purifying apparatus according to claim 1, wherein a metal electrode for eluting metal ions is provided in the aggregating means. 3. The bath water purifying apparatus according to claim 2, wherein aluminum is used for the metal positive electrode, and an eluted aluminum concentration detecting means for detecting the concentration of eluted aluminum is provided. 4. The bath water purifying apparatus according to claim 1, wherein the eluted metal concentration detecting means is provided downstream of the aggregating means and upstream of the filtering means. 5. The bath water purifying apparatus according to claim 1, wherein the eluted metal concentration detecting means is provided either upstream or downstream of the aggregating means or downstream of the filtering means. 6. The bath water purifying apparatus according to claim 1, further comprising turbidity detecting means. 7. A washing means for washing the filter means by clogging due to accumulation of coagulated substance or suspended substance by backwashing;
2. A discharge port for discharging washing water used for washing out of the circulation circuit, and turbidity detecting means is provided upstream of the discharge port.
7. The bath water purifying apparatus according to any one of items 6 to 6. 8. The bath water purifier according to claim 1, further comprising a pH changing means for changing a pH of the bath water. 9. The bath water purifying apparatus according to claim 1, further comprising an electrokinetic potential detecting means for detecting an electrokinetic potential of the suspended substance. 10. The bath water purifying apparatus according to claim 1, further comprising a temperature detecting means for detecting a temperature of the bath water and a temperature variable means for raising or lowering the temperature of the bath water.