JP3119148B2 - Water purification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commercial or domestic water purification apparatus for purifying bath water.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, there is a water purification apparatus of this type in which microorganisms are propagated in a filter medium and purification is performed by the decomposing ability of the microorganisms (see, for example, Japanese Patent Laid-Open No. 5-29).
No. 3485). The water purification device of FIG.
A circulating pump 2 for circulating the water to be purified in the water tank 1; a return pipe 4 having a three-way valve 3; a filtering means 6 having a filter medium 5 such as barley stone for filtering the water to be purified; A heater 7 for heating and keeping heat; a sterilizing device 8 for killing general bacteria contained in the water to be purified; an outflow pipe 9; A three-way valve 3, a backwash path 10, a flow path on-off valve 11,
It comprises a discharge path 12 for discharging backwash sewage, and a backwash means 14 comprising a discharge control valve 13. Note that aerobic and anaerobic microorganisms are propagated in the filter medium 5.

In this configuration, when the circulating pump 2 operates, the water in the water tank 1 passes through the filter medium 5 of the filtering means 6 as indicated by the solid arrow, and organic substances and the like are decomposed and purified by microorganisms. In addition, the water is heated and maintained at a predetermined temperature by the heater 7, and general bacteria are sterilized by the sterilizing device 8, and the purified water in the water tank 1 returns to the water tank 1 again. By repeating this operation by the circulation pump 2, the water in the bathtub 1 is gradually purified and sterilized.

On the other hand, if the filtering operation is continued for a long period of time, the filtered suspended substance adheres to the filter medium 5 of the filtering means 6 and clogging occurs. In this case, the three-way valve 3 is connected to the backwash path 10 side, the flow path opening / closing valve 11 is closed, the discharge control valve 13 is opened, and the water from the circulation pump 2 flows as indicated by the dashed arrow. Then, the inside of the filtration means 6 is back-washed through a back-washing path 10 so that suspended substances adhering to the filter medium 5 are washed and sewage is discharged.
Is discharged to the outside. As a result, long-term purification becomes possible.

[0005]

However, the above configuration has the following problems.

(1) It takes a predetermined time for microorganisms to propagate on the filter medium, and when using the above-described apparatus for the first time, it takes time until a sufficient purification effect is obtained (1 week to 10 days).
Days).

(2) In order to keep the microorganisms propagated in the filter medium without killing them and keep the activity constant, it is necessary to constantly maintain a predetermined water temperature, which results in energy loss.

(3) Once the filter medium is washed by backwashing or the like, it takes time until the ability to remove suspended substances and the activity to decompose organic substances are obtained again.

(4) In the case where a bathing agent is mixed in or where water quality is poor, microorganisms may be killed or the activity may be reduced.

In order to solve these problems, there is an agglomeration method in which a fine suspended substance is aggregated without using microorganisms to increase the size and physically filtered by a filter medium. If the timing of mixing the agent into the suspension water is inappropriate, there is a problem that sufficient purification performance cannot be obtained. Also, in this coagulation method, the suspended substance is filtered together with the coagulant, so for long-term use,
It is necessary to periodically perform backwashing (hereinafter referred to as backwashing) of the filter substance deposited on the filter medium. However, if the backwash is performed at an inappropriate timing, the filter medium is not sufficiently washed, and the subsequent purification is performed. The performance deteriorates and the water loss due to backwashing increases.

[0011]

In order to solve the above-mentioned problems in the water purifying apparatus of the coagulation method, the present invention comprises a filtering means for filtering bath water and a coagulating means for coagulating suspended substances in the bath water. And a bathing detecting means for detecting bathing in the bathtub, and a coagulating control means for controlling the coagulating means based on a signal from the bathing detecting means.

According to the present invention, the bathing detecting means operates the aggregating means on the basis of the time when a person takes a bath by the bathing detecting means, so that the agglomeration can be performed at a suitable timing. Fine suspended substances such as lime scale and bacteria are effectively aggregated by an aggregated substance such as aluminum hydroxide, and the size of the particles to be filtered becomes larger than the pore diameter of the filter medium. Purification of suspended substances is possible, and a stable purification ability is obtained. In addition, unnecessary operation of the aggregating unit can be prevented by not operating the aggregating unit when the bathing detecting unit does not detect, that is, when a person does not take a bath.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a filter means for filtering bath water, a coagulating means for coagulating a suspended substance in the bath water,
A bath detecting means for detecting bathing in the bathtub and a flocculation control means for controlling the flocculating means based on a signal from the bath detecting means are provided.

Therefore, the bathing detecting means operates the aggregating means on the basis of the time when a person takes a bath, so that the aggregating can be performed at a suitable timing.
Fine suspended substances such as human dirt and bacteria generated in the bath water are effectively agglomerated by the agglomerated substances such as aluminum hydroxide to form a lump of suspended matter having a particle size to be filtered larger than a filter medium gap diameter. This makes it possible to purify fine suspended substances,
A stable purification ability is obtained. In addition, unnecessary operation of the aggregating unit can be prevented by not operating the aggregating unit when the bathing detecting unit does not detect, that is, when a person does not take a bath.

Further, the bathing detecting means comprises a human body detecting means, a water level detecting means, a temperature detecting means and a water pressure detecting means. In particular, the bathing detecting means can surely detect a bathing.

The coagulation control means is provided with first control means for activating the coagulation means immediately after the detection of bathing, and purifies simultaneously with bathing, thereby enabling clean and comfortable bathing.

Further, the coagulation control means is provided with a second control means for activating the coagulation means after a lapse of a predetermined time of bathing detection, so that the bacteria can be coagulated and removed at a time when the bacteria rapidly proliferate. Purification becomes possible.

Further, a washing means for washing the filtering means and a washing control means for operating the washing means based on a signal from the bath detecting means are provided, and a suspended substance deposited on the filtering means is removed for a long time. Stable purification performance is obtained.

The washing control means is provided with a third control means for operating the washing means a predetermined time after the end of bathing according to a signal from the bathing detecting means. Since the means is cleaned, effective cleaning can be performed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 shows a configuration diagram of a water purification apparatus in Embodiment 1 of the present invention. In the figure, reference numeral 15 denotes a bathtub, from which a return pipe 16 serves as a circulating pump 1
7 is connected to the suction side 18. Circulation pump 17
The outlet pipe 21 is provided so as to be connected to the bathtub 15 from the discharge side 19 through a filtering means 20. Circulation circuit 2
Reference numeral 2 denotes a return pipe 16 and an outgoing pipe 21. The filtering means 20 has a particulate filter medium 23. In addition, bathtub 15
Is provided with a bathing detecting means 24. Aggregation means 2
5 is disposed upstream of the filtering means 20 and the filtering means 2
And an anode 26 made of aluminum that elutes metal ions, and a cathode 27 made of stainless steel disposed opposite the anode 26 (here, Then, filtration means 2
0 is also used as a cathode), and a constant current power supply 28 for applying a voltage between the anode 26 and the cathode 27. The coagulation control means 29 controls the constant current power supply 28.

In the above configuration, when the circulation pump 17 operates, the water in the bathtub 15 flows into the filtering means 20 via the return pipe 16, the circulation pump 17, and the outgoing pipe 21. Filtration means 2
The water in the bathtub 15 that has flowed out of the bathtub 15 flows through the go pipe 21.
Return to 5. As described above, when a person takes a bath while the water in the bathtub 15 is circulating in the circulation circuit 22, the bathing detection unit 24.
Detects the bathing, the aggregation control means 29 receives the detection signal, and the aggregation control means 29 operates the constant current power supply 28. The operation of the constant current power supply 28 causes the anode 26 and the cathode 27
During this time, current flows and aluminum ions having a high ionization tendency are eluted and reacted with water to produce aluminum hydroxide colloid. Here, suspended substances such as dirt and general bacteria mixed into the bathtub water due to human bathing are negatively charged,
The colloid of positively charged aluminum hydroxide serves as a binding medium, adsorbing fine suspended substances, increasing the particle diameter, and forming aggregated flocs. According to experiments, the particle size of suspended substances such as bacteria and organic substances is about 0.7 to 1 μm,
When a current of 300 mA was applied between the electrodes and aggregated, the particle size of the aggregated floc increased to about 30 μm. Therefore, the filtration efficiency by the particulate filter medium 23 can be increased.

As described above, according to the present embodiment, the bathing detection means 24 detects the bathing of a person, and the detection signal causes the coagulation control means 29 to switch the coagulation means 25 at a suitable timing based on the detection time. By operating, bacteria and fine suspended matter are coagulated together with flocculated substance and become large floc of suspended matter, so that fine suspended substance can be purified and stable purification ability is obtained. Can be When the bathing detecting unit 24 does not detect bathing, unnecessary operation of the aggregation unit 25 can be prevented by not operating the aggregation unit 25.

(Embodiment 2) FIG. 2 is a partial configuration diagram of a water purification apparatus according to Embodiment 2 of the present invention, and illustrates a case where the bathing detecting means 24 of FIG. . The human body detecting means 30 is composed of a light emitter 31 having a light emitting element and a light receiver 32 having a light receiving element.

Next, the operation of this embodiment with the above configuration will be described. As shown in FIG. 2, in a state where light is projected from the light projector 31 to the light receiver 32,
The light receiving element provided inside converts the light into an electric signal, and sends the electric signal to the aggregation control means 29. Here, when a person takes a bath in the bathtub 15, the light emitted from the light emitter 32 is cut off, and the electric signal transmitted from the light receiver 32 also stops. As a result, the bathing is detected and the coagulation control means 29 is activated, the constant current power supply 28 shown in FIG. 1 is operated, and electricity is supplied between the anode 26 and the cathode 27 to coagulate.

As described above, according to the present embodiment, the bathing detector 3 having the light emitting element for detecting the bathing reliably by the bathing detecting means.
1 and the human body detecting means 30 including the light receiver 32 with a built-in light receiving element, the malfunction of the bathing detection can be prevented, the stable purification performance by the reliable coagulation control can be obtained, and the bathing detection signal is output during the bathing. It can also be used for purposes other than coagulation control, such as prevention of hot water.

(Embodiment 3) FIG. 3 is a partial configuration diagram of a water purification apparatus showing Embodiment 3 of the present invention, and illustrates a case where the bathing detecting means 24 in FIG. . The water level detecting means 33 comprises a light projector 34 having a light emitting element, a light receiver 35 having a light receiving element, and a water level tube 37 whose water surface 36 changes in the same manner as the bathtub water level.

Next, the operation of this embodiment with the above configuration will be described. Light is emitted from the light projector 34.
When a person enters the bathtub 15, the water surface 36 changes, and the amount of light projected changes with the change. Light receiver 35
Converts the change in the amount of light into an electric signal,
9 The coagulation control means 29 is activated when a certain change in the electric signal is received. As shown in FIG.
9 operates the constant current power supply 28. By the operation of the constant current power supply 28, a current flows between the anode 26 and the cathode 27 to be aggregated.

As described above, the present embodiment employs the water level detecting means 33.
Is provided, the bathing can be detected and the coagulation control can be performed, and the amount of bathtub water itself can be detected, so that the circulating pump 17 can be prevented from running idle.

(Embodiment 4) FIG. 4 is a partial configuration diagram of a water purification apparatus showing Embodiment 4 of the present invention, and illustrates a case where the bathing detecting means 24 of FIG. 1 is a temperature detecting means 38. . The temperature detecting means 38 is composed of a thermocouple or a thermistor made of copper-constantan, chromel-alumel, platinum-platinum-rhodium, or the like, and is incorporated in the going pipe 16.

Next, the operation of this embodiment with the above configuration will be described. When a person enters the bathtub 15, the water temperature changes. The temperature detecting means 38 converts the change in temperature into an electric signal and transmits the electric signal to the coagulation controlling means 29. The coagulation control means 29 detects and starts bathing when a certain change in the electric signal is received. As shown in FIG. 1, the coagulation control means 29 operates the constant current power supply 28, and electricity is supplied between the anode 26 and the cathode 27 to start coagulation.

As described above, according to the present embodiment, the bathing detecting means 24 is replaced by the temperature detecting means 3 comprising a thermocouple or a thermistor.
By adopting 8, the simplification and cost reduction of the device can be realized.

(Embodiment 5) FIG. 5 is a partial configuration diagram of a water purification apparatus showing Embodiment 5 of the present invention, and illustrates a case where the bathing detecting means 24 of FIG. . The water pressure detecting means 39 is composed of a membrane type pressure sensor using a diaphragm or the like, and is incorporated in the bathtub inner wall.

Next, the operation of this embodiment with the above configuration will be described. The water pressure changes when a person enters the bathtub 15. The water pressure detecting means 39 converts the change in the water pressure into an electric signal and transmits the electric signal to the coagulation control means 29. The coagulation control means 29 detects and starts bathing when a certain change in the electric signal is received. As shown in FIG. 1, the coagulation control unit 29 operates the constant current power supply 28, and electricity is supplied between the anode 26 and the cathode 27 to start coagulation.

As described above, according to this embodiment, the bathing detecting means 24 is the water pressure detecting means 38 comprising a membrane type pressure sensor using a diaphragm or the like, so that the detecting means can be easily installed and the apparatus can be simplified. Can be realized.

(Embodiment 6) FIG. 6 is a partial configuration diagram of a water purification apparatus according to Embodiment 6 of the present invention. Reference numeral 40 denotes first control means for controlling the coagulation control means 29 shown in FIG. The coagulation control unit 29 is operated at the same time that the bathing is detected by the bathing detection unit 24.

Next, the operation of this embodiment with the above configuration will be described. From FIG. 6, the bathing detecting means 24 detects bathing and issues a detection signal. The first control means 40 receives the detection signal and operates the aggregation control means 29 simultaneously with the reception. As shown in FIG. 1, the coagulation control means 29 operates the constant current power supply 28 to start coagulation immediately after bathing.

As described above, according to the present embodiment, the first control means 40 activates the aggregating means 29 at the same time that the bath detecting means 24 detects the bathing of a person. As a result, rapid purification by the coagulation action is performed during bathing, and an increase in water turbidity of the bathtub during bathing is suppressed, so that clean and comfortable bathing is enabled.

(Embodiment 7) FIG. 7 is a partial configuration diagram of a water purification apparatus showing Embodiment 7 of the present invention. Reference numeral 41 denotes second control means for controlling the coagulation control means 29 shown in FIG. The coagulation control unit 29 is configured to operate a predetermined time after the bathing is detected by the bathing detection unit 24.

Next, the operation of this embodiment with the above configuration will be described. From FIG. 7, the bathing detecting means 24 detects bathing and issues a detection signal. The detection signal is received by the second control means 41, and after a predetermined time from the reception, the aggregation control means 29
To work. As shown in FIG. 1, the aggregation control means 29 operates the constant current power supply 28 to start aggregation.

As described above, according to the present embodiment, the second control means 41 operates the aggregating means 29 a predetermined time after the bathing detecting means 24 detects the bathing of a person. As a result,
General bacteria are effectively aggregated into large clumps and filtered. That is, general bacteria attached to the human body are mixed in the bath water by taking a bath, and in the initial state, the number is small,
According to the growth characteristics of the bacterium, the bacterium proliferates rapidly in the logarithmic growth phase through the incubation period and the induction period. The logarithmic growth period is said to be in the range of about 4 hours to 16 hours after bathing. Desirably, the bacteria can be effectively aggregated and filtered by aggregating in this time zone, thereby improving the purification ability.

(Eighth Embodiment) FIG. 8 is a block diagram of a water purification apparatus showing an eighth embodiment of the present invention. In FIG.
5 to 28 are the same as in FIG. The cleaning means 42 includes a three-way valve (A) 43, a three-way valve (B) 44, and a cleaning pipe 45. The three-way valve (A) 43 and the three-way valve (B) 44 are designed to bypass the filtration tank 20. The cleaning pipe 45 is connected. The drain pipe 46 and the two-way valve 47 are provided on the upstream side of the filtration tank 20. The washing control means 48 includes the bath detecting means 24.
Three-way valve (A) 43, three-way valve (B) 44
And the two-way valve 47 is controlled. Filter tank outlet 49
The water in the bath 15 filtered in the filter tank 20
1 shows a connection portion between the filtration tank 20 and the outflow pipe 21 flowing out to 1.

Next, the operation of this embodiment with the above configuration will be described. 8, when the circulation pump 17 operates, the water in the bathtub 15 flows into the filtering means 20 via the return pipe 16, the circulation pump 17, and the outgoing pipe 21. The water in the bathtub 15 that has flowed out of the filtering means 20 returns to the bathtub 15 via the going pipe 21. As described above, when a person takes a bath while the water in the bathtub 15 is circulating in the circulation circuit 22, suspended substances such as human scales are generated in the bathtub water, and the water in the bathtub 15 containing the suspended substances is generated. Flows into the filtering means 20 via the return pipe 16, the circulation pump 17, and the going pipe 21, and is filtered by the particulate filter medium 23.
Further, the bathing detection unit 24 transmits a bathing detection signal to the cleaning control unit 48. The cleaning control means 48 receives the detection signal and opens the three-way valve (A) 43 so that the water in the bathtub 15 flows from the discharge side 19 of the circulation pump 17 to the cleaning pipe 45 via the going pipe 21. Further, the washing control means 48 opens the three-way valve (B) 44 and the two-way valve 47 so that the water in the bathtub 15 flows from the washing pipe 45 to the filtration tank outlet 49. The water in the bathtub 15 that has flowed into the filter tank 20 from the filter tank outlet 49 discharges suspended matter such as dirt and general bacteria filtered through the particulate filter medium 23 from the drain pipe 46.

As described above, according to the present embodiment, the washing control means 48 operates the washing means 42 based on the signal of the bathing detecting means 24, that is, based on the bathing time, so that the filter medium can be suitably timed. Washing is performed, and suspended matter due to human scum etc. deposited on the surface of the filter medium is removed, thereby preventing clogging of the filter medium due to the suspended substance,
Long-term stable purification performance is obtained. In particular, since the bathing can be detected, clogging of the filter medium by the suspended substance can be easily predicted, and the filter medium can be washed at a suitable timing.

(Embodiment 9) FIG. 9 is a partial configuration diagram of a water purifying apparatus showing Embodiment 9 of the present invention. Reference numeral 50 denotes third control means for controlling the cleaning control means 48 shown in FIG. The cleaning control unit 48 is configured to operate after a predetermined time from the reception of the signal from the bathing detection unit 24.

Next, the operation of this embodiment with the above configuration will be described. The third control means 50 includes the bathing detection means 24
The cleaning control means 48 is operated a predetermined time after the detection signal is received. As shown in FIG.
Means that water in the bathtub 15 flows from the washing pipe 45 to the filtration tank outlet 49.
The three-way valve (A) 43 and the three-way valve (B) 44 are opened, and the two-way valve 47 is opened so as to flow to the outside. The water in the bathtub 15 that has flowed into the filter tank 20 from the filter tank outlet 49 is removed by the granular filter medium 23.
Suspended substances such as dirt and general bacteria filtered through the drain are discharged from the drain pipe 46.

As described above, according to the present embodiment, the third control means 50 operates the cleaning means 42 after a lapse of a predetermined time since the bathing detection means 24 detects the bathing. As a result,
General bacteria growing in the filtration tank can be efficiently discharged to the outside of the purification system by backwashing, and the growth of bacteria in the filtration tank can be suppressed. That is, general bacteria adhering to the human body are mixed in the bath water by bathing, and although the number is small in the initial state, the bacteria rapidly grow into the logarithmic growth phase through the incubation period and induction period according to the growth characteristics of the bacteria. The logarithmic growth period is said to be in the range of about 4 hours to 16 hours after bathing. Desirably, by backwashing during the logarithmic growth period, bacteria before growth in the filtration tank are discharged out of the purification system. As a result, the growth of bacteria is suppressed, more effective backwashing becomes possible, and the deterioration of turbidity due to bacteria can be reduced. In addition, since the amount or the number of times of water used for backwashing can be reduced, water saving can be achieved.

[0047]

As is clear from the above description, the following effects can be obtained according to the water purification apparatus of the present invention.

(1) By providing a bathing detecting means and operating the aggregating means on the basis of the time when a person takes a bath, it becomes possible to perform aggregating at a suitable timing, and human dirt and bacteria generated in the bathtub water. By effectively aggregating fine suspended substances such as, for example, with the agglomerated substances, a stable purification ability can be obtained. In addition, when the bathing detecting means does not detect, that is, when the person does not take a bath, the aggregating means is not operated, so that unnecessary operation of the aggregating means can be prevented.

(2) Since the bathing detecting means is a human body detecting means, a malfunction of bathing detection can be prevented, more stable purification control by reliable coagulation control can be obtained, and the bathing detection signal can be a high temperature during bathing. It can also be used for purposes other than coagulation control, such as hot water prevention.

(3) By operating the aggregating means simultaneously with the bathing, rapid purification by the aggregating action is performed during the bathing. This suppresses the increase in turbidity of the bathtub during bathing,
Clean and comfortable bathing becomes possible.

(4) By operating the aggregating means a predetermined time after a person takes a bath, preferably during the logarithmic growth phase of bacteria, general bacteria smaller than the inter-filter medium gap diameter are aggregated, and the inter-filter medium gap diameter is increased. By becoming larger lump (flock),
Bacteria can be effectively agglutinated and filtered to improve the purification ability.

(5) By operating the washing means on the basis of the bathing time, suspended substances such as human scum accumulated on the surface of the filter medium are removed, and clogging of the filter medium by the suspended substances is prevented. Long-term stable purification performance is obtained. In particular, since the bathing can be detected, clogging of the filter medium by the suspended substance can be easily predicted, and the filter medium can be washed at a suitable timing.

(6) By operating the washing means a predetermined time after the person takes a bath, preferably before the logarithmic growth period of the bacteria, the general bacteria growing in the filtration tank are discharged out of the purification system. As a result, the growth of bacteria in the filtration tank is suppressed, and more effective backwashing can be performed, and deterioration of turbidity due to bacteria can be reduced. Further, since the amount of water or the number of times used for backwashing can be reduced, water can be saved.

[Brief description of the drawings]

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

FIG. 2 is a partial configuration diagram of a water purification device according to a second embodiment of the present invention.

FIG. 3 is a partial configuration diagram of a water purification device according to a third embodiment of the present invention.

FIG. 4 is a partial configuration diagram of a water purification device according to a fourth embodiment of the present invention.

FIG. 5 is a partial configuration diagram of a water purification device according to a fifth embodiment of the present invention.

FIG. 6 is a partial configuration diagram of a water purification device according to a sixth embodiment of the present invention.

FIG. 7 is a partial configuration diagram of a water purification device according to a seventh embodiment of the present invention.

FIG. 8 is a system configuration diagram of a water purification device according to an eighth embodiment of the present invention.

FIG. 9 is a partial configuration diagram of a water purification device according to a ninth embodiment of the present invention.

FIG. 10 is a system configuration diagram of a conventional water purification device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 15 Bathtub 20 Filtration means 24 Bathing detection means 25 Coagulation means 29 Coagulation control means 30 Human body detection means 33 Water level detection means 38 Temperature detection means 39 Water pressure detection means 40 First control means 41 Second control means 42 Cleaning means 48 Cleaning control means 50 Third control means

Continuation of the front page (72) Inventor Takemi Oketa 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-5-269319 (JP, A) (58) Fields investigated ( Int.Cl. ⁷ , DB name) B01D 35/027 A47K 3/00

Claims (9)

(57) [Claims] 1. A bathtub, and filtering means for filtering bathtub water.
The aggregating means for aggregating the suspended matter in the bathtub water, a bathing detecting means for detecting bathing in the bathtub, and an aggregating control means for controlling the aggregating means based on a signal from the bathing detecting means. Water purification device. 2. The water purifying apparatus according to claim 1, wherein the bathing detecting means comprises a human body detecting means for directly detecting the presence of a person in the bathtub. 3. The water purifier according to claim 1, wherein the bathing detecting means comprises a water level detecting means for detecting a change in water level due to bathing. 4. The water purifier according to claim 1, wherein the bathing detecting means comprises a temperature detecting means for detecting a change in water temperature due to bathing. 5. The water purifying apparatus according to claim 1, wherein the bathing detecting means comprises a water pressure detecting means for detecting a change in water pressure due to bathing. 6. The water purification apparatus according to claim 1, wherein the coagulation control means has a first control means for activating the coagulation means immediately after bathing is detected by the bathing detection means. 7. The water purification apparatus according to claim 1, wherein the coagulation control means has a second control means for activating the coagulation means a predetermined time after the bathing is detected by the bathing detection means. 8. A bathtub, and filtering means for filtering bathtub water.
Aggregating means for aggregating suspended matter in the bathtub water, bathing detecting means for detecting bathing in the bathtub, cleaning means for cleaning the filtering means, and the cleaning means based on a signal from the bathing detecting means A water purification apparatus provided with cleaning control means for operating the water purifier. 9. The water purifying apparatus according to claim 8, wherein the washing control means has third control means for operating the washing means a predetermined time after the end of bathing according to a signal from the bathing detecting means.