JP7297312B2 - Bathhouse drainage purification equipment - Google Patents

Description

The present invention is a bath drainage purification system that conserves water resources while reducing the fuel required for reheating by reusing the concentrated water in which impurities are concentrated discharged from the reverse osmosis membrane device as hot water. It is about .

Water from water tanks such as pools and bathtubs is reused by purifying it with a water purifier.
Various types of filters are used in water purifiers for purification. Among them, a reverse osmosis membrane device using a reverse osmosis membrane, which is also called an RO membrane, is suitable for purifying water because the pores of the reverse osmosis membrane are as small as 2 nm or less. However, in the reverse osmosis membrane apparatus, in addition to the treated water from which impurities have been removed by passing through the reverse osmosis membrane, concentrated water containing many impurities due to failure to pass through the reverse osmosis membrane is discharged.
Therefore, in the reverse osmosis membrane device, concentrated water is always thrown away, resulting in much waste. Regarding a water purifying device using such a reverse osmosis membrane device, one described in Patent Document 1 is known.

In the water treatment apparatus and water treatment method described in Patent Document 1, an electrolyte solution containing chlorine ions is added to water to be treated, which is introduced from a large water tank such as a pool or a bathtub in a bathhouse, to store the water to be treated. Water to be treated is introduced from a water tank into an electrolytic cell that is sterilized by an electrochemical reaction, and after sterilization is returned to the water tank through a water treatment route. It is concentrated and separated by a reverse osmosis membrane. The concentrated liquid, in which various organic substances and ions separated by the concentrator are concentrated and whose water quality is lowered, is introduced into the electrolytic cell via the storage tank.

JP-A-2003-39071 JP 2013-108104 A

In the water treatment apparatus and water treatment method described in Patent Document 1, the water to be treated that is discharged from a water tank such as a bath tub is returned to the water tank after undergoing various treatments. , it is thought that the fuel required for reheating can be suppressed.
However, in the water treatment apparatus and the water treatment method described in Patent Document 1, the concentrated water from the concentration apparatus that is concentrated and separated by the osmotic membrane is introduced into the electrolytic cell through the storage tank, and electrolyzed to be sterilized by the electrochemical reaction. After the tank is sterilized, the water is returned to the water tank.
Therefore, in the water treatment apparatus and the water treatment method described in Patent Document 1, the concentrated liquid whose water quality has deteriorated from the concentration apparatus flows back to the water tank through the electrolytic cell, so purification is insufficient. In that case, if the water to be treated is repeatedly refluxed, the quality of the water tank will gradually deteriorate.
If the concentrated liquid discharged from the concentrator can be sufficiently purified, the consumption of water can be reduced by reusing the concentrated water.

Therefore, the present invention can reduce water consumption by sufficiently purifying the concentrated water and reusing it as hot water, and can reduce the fuel required for reheating. It is an object of the present invention to provide a purification device .

The bath wastewater purifier of the present invention comprises a reverse osmosis membrane device for removing impurities from bath wastewater to be treated , and a concentrated water in which the impurities discharged from the reverse osmosis membrane device are concentrated. An electrolytic treatment device that returns the electrolyzed water removed by being adsorbed to the electrode to which is applied to the reverse osmosis membrane device as water to be treated, a high-pressure pump that pressure-feeds the water to be treated to the reverse osmosis membrane device; A mixing device for adding a scale inhibitor to the water to be treated to the high-pressure pump, and a water pump for feeding the treated water from the reverse osmosis membrane device to the bath for reuse as makeup water for the bath. It is characterized by

According to the present invention, concentrated water containing impurities is discharged from the reverse osmosis membrane device. Although the purifying function of the equipment deteriorates early, the electrolytic treatment equipment removes ionized impurities from this concentrated water and returns it to the reverse osmosis membrane equipment as electrolyzed water. The concentrated water can be reused without unduly increasing the burden.

A storage tank for storing water to be treated may be provided on the upstream side of the reverse osmosis membrane device, and the electrolysis apparatus may feed the electrolyzed water to the storage tank.
By returning the electrolyzed water to the storage tank storing the water to be treated, the flow rate from the storage tank to the reverse osmosis membrane device can be adjusted, so the flow rate to the reverse osmosis membrane device can be stabilized.

An activated carbon filtration device may be installed between the storage tank and the reverse osmosis membrane device. Since an activated carbon filtration device is installed to pre-treat the water to be treated that is sent to the reverse osmosis membrane device, the activated carbon adsorbs and removes impurities from the water to be treated, as well as deodorizes and decolorizes the water. The burden on the device can be reduced. In addition, since the electrolyzed water purified by the electrolyzer is also purified by the activated carbon filtration device through the storage tank, it is possible to purify the electrolyzed water. The burden can be further reduced.

A plurality of the electrolysis devices are installed in parallel, and the plurality of electrolysis devices have a first operating state in which electrolyzed water is generated from concentrated water, and waste water containing impurities by inverting the polarity of the electrodes. can be provided with a control panel for instructing either of a second operating state for discharging the electrolytic treatment apparatus and operating one or more of the electrolysis apparatuses in the first operating state.
A plurality of electrolyzers are installed, and the control panel instructs one or more of the electrolyzers to operate in the first operating state, and instructs the remaining electrolyzers to operate in the second operating state. do. By doing so, while the electrolysis device is discharging wastewater, any other electrolysis device is generating electrolyzed water in the first operating state. Therefore, the electrolyzed water can be generated without stopping.

In the present invention, since the electrolytic treatment device removes ionized impurities from the concentrated water from the reverse osmosis membrane device and returns it to the reverse osmosis membrane device as electrolyzed water, the burden on the reverse osmosis membrane device is excessively increased. The concentrated water can be reused without Therefore, in the present invention, by sufficiently purifying the concentrated water and reusing it as hot water, it is possible to reduce the amount of water consumed, and it is possible to suppress the fuel required for reheating. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the bathhouse drainage purification apparatus which concerns on Embodiment 1 of this invention. FIG. 2 is a diagram for explaining a pretreatment unit of the bath drainage purification apparatus shown in FIG. 1; 1. It is a figure for demonstrating the reverse osmosis membrane process part and the purification part for return of the bathhouse drainage purification apparatus shown in FIG. FIG. 2 is a diagram for explaining a post-treatment unit of the bath drainage purification apparatus shown in FIG. 1; FIG. 5 is a diagram for explaining a bathhouse drainage purification device according to Embodiment 2 of the present invention;

(Embodiment 1)
A water purifier according to Embodiment 1 of the present invention will be described with reference to the drawings. The water purifier according to Embodiment 1 is installed in a bathing facility, and is a bathhouse drainage purifier that purifies drainwater from a bathhouse and reuses it as make-up water.
The bath wastewater purification apparatus 10 shown in FIG.

(Configuration of pretreatment unit)
First, the configuration of the preprocessing section 20 will be described with reference to FIG.
As shown in FIG. 2, the pretreatment unit 20 includes a drainage tank 21 in which hot bath wastewater is stored as water to be treated, a screen 22 connected to the drainage tank 21, and a screen 22 connected to the screen 22. A biological filtration tank 23 and a submerged membrane tank 25 connected to the biological filtration tank 23 via an aeration tank pump 24 are provided.
Two aeration tank pumps 24 are installed for alternate operation.
In the drainage tank 21, an air diffusion pipe 21b for diffusing air from a drainage air diffusion blower 21a for aeration, and two water pumps 21c for supplying water to be treated in the drainage tank 21 are arranged in the tank. ing.

The screen 22 removes dirt, hair, and the like by allowing the water to be treated to pass through a metal plate having a large number of narrow slits.
In the biological filtration tank 23, an aeration pipe 23b for diffusing air from a biological filtration air diffusion blower 23a for aeration is arranged in the tank. It decomposes filth by
The submerged film tank 25 is provided with two submerged film blowers 25a which are alternately operated in order to supply air into the tank. Also, in the submerged membrane tank 25, two suction pumps 25b that are operated in parallel are arranged in order to pull up the water to be treated in the tank.
The submerged membrane tank 25 is provided with a circulation pump 25c in a circulation line P11 connected to the submerged membrane tank 25 so that the water to be treated flowing out of the submerged membrane tank 25 flows in again.
The submerged membrane tank 25 is connected to the reverse osmosis membrane processing section 30 via a pipe P12 provided with a raw water meter M11 and a turbidity meter M12.

(Configuration of reverse osmosis membrane processing section)
Next, the configuration of the reverse osmosis membrane processing section 30 will be described with reference to FIG.
As shown in FIG. 3, the reverse osmosis membrane treatment unit 30 is connected to a relay tank 31 connected to the submerged membrane tank 25 (see FIG. 2) of the pretreatment unit 20 via a filtration pump 32. a check filter 34 connected to the activated carbon filtration device 33; a high pressure pump 35 connected to the check filter 34; and a reverse osmosis membrane device 36 connected to the high pressure pump 35. .

The relay tank 31 is a storage tank that temporarily stores the water to be treated from the pretreatment section 20 (see FIG. 2). Further, the relay tank 31 is connected with a pipe P31 through which the treated water from the return purification unit 40 is sent.
Two filtration pumps 32 are installed in order to be alternately driven in normal times.
The activated carbon filtering device 33 (filtering device) filters the water to be treated with activated carbon.
The check filter 34 incorporates a thread-wound filter in which thread is wound many times around a cylindrical core material as a cartridge filter. Wound filters trap impurities by passing them from the inside out.
A pipe P21 between the check filter 34 and the high-pressure pump 35 is connected to a pipe from a mixing device 37 for charging the anti-scaling agent.

The reverse osmosis membrane device 36 passes the water under pressure through a reverse osmosis membrane, also known as an RO membrane, which allows water to pass through but does not allow impurities to pass through pores of 2 nm or less. It removes impurities from
The reverse osmosis membrane device 36 discharges water from which impurities have been removed from the water to be treated as treated water (bathwater), and water in which impurities have been concentrated without being able to pass through the reverse osmosis membrane is discharged as concentrated water.
The pipe P22 to which the treated water of the reverse osmosis membrane device 36 is sent and connected to the post-treatment section 50 is connected to the pipes from the mixing devices 38 and 39 for charging the pH adjuster and the sterilant. ing. The pipe P22 is provided with a pH meter M21 for measuring pH and a conductivity meter M22 for measuring electrical conductivity.
A return purifier 40 is connected to the pipe P23 through which the concentrated water from the reverse osmosis membrane device 36 is sent.
Further, a pipe P24 to which concentrated water from the reverse osmosis membrane device 36 is sent is connected to the upstream side of the high-pressure pump 35. As shown in FIG.

(Structure of return purifier)
Next, the return purifier 40 will be described with reference to FIG.
As shown in FIG. 3 , the return purification section 40 includes an electrolytic treatment device 41 connected to a pipe P23 from the reverse osmosis membrane processing section 30 .
The pipe P23 is provided with a water flow meter M31 and a conductivity meter M32.
Further, a conductivity meter M33 is provided on the pipe P31 through which the electrolytically treated water from the electrolytic treatment device 41 is sent. Further, a pipe P32 through which waste water from the electrolysis device 41 is discharged into sewage is connected to the downstream side of the pipe P31 provided with the conductivity meter M33.

Here, the electrolytic treatment device 41 will be described.
The electrolytic treatment device 41 applies a voltage to a pair of electrodes to adsorb ionic impurities contained in the concentrated water, negatively ionized impurities to the positive electrode and positively ionized impurities to the negative electrode, thereby The flowing water from which impurities have been removed is discharged as electrolyzed water.
By reversing the polarity of the voltage applied to the electrodes, the electrolytic treatment apparatus 41 can strip impurities from the respective electrodes.
For the electrolytic treatment device 41, for example, the electrolytic treatment device described in Patent Document 2 can be used.

In this electrolytic treatment apparatus, raw water containing dissolved ions is passed between both electrodes, an anode and a cathode, and a voltage is applied to adsorb anion components of the dissolved ions to the anode and cation components to the cathode. A deionization device (hereinafter referred to as "CDI device") that concentrates and desorbs the concentrated ions from each electrode by short-circuiting both electrodes or passing a reverse current, etc., and an electrolytic cell. is.
In addition, for the electrolysis treatment device 41, a smart deionization system (SDI (trademark)) manufactured by Shiontech can be used.

(Configuration of post-processing unit)
Next, the configuration of the post-processing section 50 will be described with reference to FIG.
The post-treatment unit 50 shown in FIG. 4 includes a treated water tank 51 in which the treated water from the pipe P22 from the reverse osmosis membrane treatment unit 30 is stored as reclaimed water, and a secondary treatment connected to the treated water tank 51 via a water pump 52. A water tank 53, a heat exchanger 55 connected to the secondary treatment water tank 53 via a water pump 54a, a hot water tank 56 connected to the heat exchanger 55, and hot water from the hot water tank 56 as make-up water W3. It is equipped with a water pump 57 that feeds water to.

The treated water tank 51 temporarily stores treated water, and is replenished with city water via a city water replenishment valve 51a.
To the treated water tank 51, a mixing device 51b for charging a sterilant is connected to a circulation pipeline P41 connected so that the treated water discharged from the treated water tank 51 flows in again. The circulation line P41 is provided with a circulation pump 51c and a residual chlorine meter M41.
A water level gauge 53 a is installed in the secondary treatment water tank 53 . A water pump 54b is provided for using the reclaimed water from the secondary treatment water tank 53 for water supply to each bathtub (bathtub water supply W1).
Further, a water pump 54c is provided to use the reclaimed water from the secondary treatment water tank 53 as the water bath supplementary water W2 or the bath bath supplementary water W3.
A water level gauge 56 a is installed in the hot water tank 56 .
Further, the hot water tank 56 is provided with a heat exchanger 56b in a circulation line P42 connected so that hot water flowing out of the hot water tank 56 flows in again. A circulation pump 56c is provided in the circulation line P42.

The control panel 60 shown in FIG. 1 controls the bathhouse drainage purification apparatus 10 as a whole based on the signals from the gauges installed in each part.
The control panel 60, as shown in FIGS. 2 to 4, comprises a main control panel 61, an indoor panel 62, and an outdoor panel 63 (see FIG. 4).
The main control panel 61 stores a control section for performing overall control.
The main control panel 61 supplies power to each blower and pump based on signals from the water flow meter, water level meter, conductivity meter, and pH meter.
The indoor panel 62 has a function of controlling the submerged membrane tank 25 and relaying signals and power from the main control panel 61 to the outdoor panel 63 .

The operation and usage of the bathhouse drainage purification apparatus according to Embodiment 1 of the present invention configured as described above will be described with reference to the drawings.
(Processing in the preprocessing section)
First, as shown in FIG. 2, the water to be treated from the bathhouse wastewater is stored in the wastewater tank 21 . The water to be treated stored in the drainage tank 21 is sent to the screen 22 by the water pump 21c.
In the screen 22, hair and dirt are removed by passing through slits formed in the metal plate.
In the water to be treated that has been sent from the screen 22 to the biological filtration tank 23, dissolved impurities are decomposed and removed by aerobic microorganisms.
Furthermore, impurities in the water to be treated sent from the biological filtration tank 23 by the aeration tank pump 24 are decomposed and removed by the aerobic microorganisms contained in the activated sludge in the submerged membrane tank 25 .
Then, the water is sent from the biological filtration tank 23 to the reverse osmosis membrane treatment unit 30 through the pipe P12 by the suction pump 25b.

(Processing in the reverse osmosis membrane processing section)
As shown in FIG. 3 , in the reverse osmosis membrane treatment section 30 , first, the water to be treated from the pretreatment section 20 is stored in the relay tank 31 . The water to be treated sent from the relay tank 31 by the filtration pump 32 is sent to the activated carbon filtering device 33 . In the activated carbon filtering device 33, porous activated carbon adsorbs harmful substances, odorous substances, and the like in the water to be treated, removes them, and decolorizes and deodorizes them.
Next, impurities that could not be removed by the activated carbon filtering device 33 are removed from the water to be treated that has been sent to the check filter 34 by the thread-wound filter of the check filter 34 . By doing so, impurities can be removed as much as possible from the water to be treated before it is introduced into the reverse osmosis membrane device 36 .
A scale preventive agent is introduced by a mixing device 37 into a pipe P21 connected from the check filter 34 to the high-pressure pump 35 .
By introducing the scale inhibitor, it is possible to prevent calcium dissolved in the water to be treated from depositing and adhering to the inner peripheral wall of the pipe downstream of the high-pressure pump 35 and forming a layer.

Next, the high-pressure pump 35 applies pressure to the water to be treated which is sent to the reverse osmosis membrane device 36 . The water under pressure by the high-pressure pump 35 is pressure-fed to the reverse osmosis membrane device 36 .
In the reverse osmosis membrane device 36, the treated water from which impurities have been removed by passing through the reverse osmosis membrane is sent to the post-treatment section 50 through the pipe P22.
At this time, the treated water is mixed with the pH adjuster by the mixing device 38 and the sterilant by the mixing device 39 .

When the treated water is fed as reclaimed water to the post-treatment section 50 through the pipe P22, the pH value is measured by the pH meter M21, and the electrical conductivity is measured by the conductivity meter M22.
Based on the pH value measured by the pH meter M21, the main control panel 61 adjusts the mixing device 38 shown in FIG. 2 for charging the pH adjusting agent.
In addition, based on the electrical conductivity measured by the conductivity meter M22, the main control panel 61 increases the degree of removal in each filtration tank, In the case of (2), the concentrated water from the reverse osmosis membrane device 36 is sent to the upstream side of the high-pressure pump 35 through the pipe P24 without flowing to the return purifier 40 through the pipe P23.

(Processing in the post-processing section)
As shown in FIG. 4, in the post-treatment section 50, reclaimed water is first stored in a treated water tank 51 as a primary storage tank. At this time, if the amount of water is insufficient, the city water replenishment valve 51a is opened and city water is replenished.
Further, the reclaimed water sent from the treated water tank 51 by the water sending pump 52 is sent to the secondary treated water tank 53 as a primary storage tank.
If the temperature of the reclaimed water stored in the secondary treatment water tank 53 is sufficient, the water is sent to each bathtub by the water pump 54b.
Even when the temperature of the reclaimed water stored in the secondary treatment water tank 53 is low, a water bath can be used. In that case, the water pump 54c is used to supply water as water bath supplementary water W2, or to supply water as bath facility supplementary water W3.
When the temperature of the make-up water W3 used in the bath is low, the reclaimed water supplied by the water supply pump 54a is heat-exchanged with the circulating hot water by the heat exchanger 55 to be heated.

The reclaimed water heated by the heat exchanger 55 is stored in the hot water tank 56 . In the hot water tank 56, the reclaimed water is circulated through the circulation line P42 by the circulation pump 56c, and is further heated by the heat exchanger 56b provided in the circulation line P42.
Then, the sufficiently heated reclaimed water stored in the hot water tank 56 is sent to the bathhouse as make-up water W3 by the water sending pump 57 .

(Processing in the return purification unit)
Next, the regeneration of concentrated water discharged as water containing impurities by the reverse osmosis membrane device 36 of the reverse osmosis membrane treatment section 30 will be described.
The concentrated water discharged from the reverse osmosis membrane device 36 is sent to the return purifier 40 through the pipe P23.
The flow rate of the concentrated water sent to the return purification unit 40 is measured by the water flow meter M31 provided in the pipe P23, and the electrical conductivity is measured by the conductivity meter M32.
Then, when the concentrated water is sent to the electrolytic treatment device 41 , the ionized impurities are removed by the electrolytic treatment device 41 .
The concentrated water from which impurities have been removed becomes electrolyzed water and is sent to the relay tank 31 through the pipe P31.

The electrolyzed water returned to the relay tank 31 is pressure-fed to the reverse osmosis membrane device 36 by the high-pressure pump 35 again through the activated carbon filtration device 33 and the check filter 34 together with the water to be treated.
Then, as described above, the treated water from the reverse osmosis membrane device 36 is turned into reclaimed water and sent to the post-treatment section 50 through the pipe P22.

In this way, the concentrated water containing impurities is discharged from the reverse osmosis membrane device 36. However, if the concentrated water is returned to the reverse osmosis membrane device 36 as it is for reuse, it contains a large amount of impurities. In the apparatus 36, the reverse osmosis membrane deteriorates early and the purifying function deteriorates. However, the electrolysis device 41 removes the ionized impurities from this concentrated water. Therefore, the electrolytic treatment device 41 can remove ionized impurities that have not passed through the reverse osmosis membrane of the reverse osmosis membrane device 36, so that the concentrated water can be purified.
Since the electrolytic treatment device 41 returns the electrolyzed water obtained by purifying the concentrated water to the reverse osmosis membrane device 36 as the water to be treated, the concentrated water can be reused without excessively increasing the load on the reverse osmosis membrane device 36. can be used.

The electrolyzed water is produced by purifying the water to be treated by the reverse osmosis membrane device 36 and then purifying the concentrated water discharged by the electrolysis treatment device 41. Since the water is passed through the device 36, the temperature is higher than that of city water, so energy can be saved as compared with the use of heated city water.
Therefore, the bathhouse drainage purification device 10 sufficiently purifies the concentrated water and reuses the hot water as it is, thereby reducing water consumption and reducing fuel required for reheating. It is possible.

Since the flow rate from the relay tank 31 to the reverse osmosis membrane device 36 can be adjusted by returning the electrolyzed water to the relay tank 31 storing the water to be treated, the flow rate to the reverse osmosis membrane device 36 is stabilized. be able to.

Since the activated carbon filtration device 33 is installed between the relay tank 31 and the reverse osmosis membrane device 36, the activated carbon in the activated carbon filtration device 33 adsorbs and removes impurities from the water to be treated, and also deodorizes and decolorizes the water. is performed, the load on the reverse osmosis membrane device 36 can be reduced. In addition, since the electrolyzed water purified by the electrolyzer 41 is also purified by the activated carbon filter device 33 again via the relay tank 31, it is possible to purify the electrolyzed water. The burden on the device 36 can be further reduced.

(Embodiment 2)
A bathroom wastewater purification apparatus according to Embodiment 2 of the present invention will be described with reference to the drawings.
In FIG. 5, the same components as in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
A bathhouse wastewater purification device 11 according to the second embodiment shown in FIG. 5 has a plurality of electrolytic treatment devices 41 installed in a return purification unit 40x.
In Embodiment 2, two electrolytic treatment apparatuses 41 are installed.

When the electrolysis device 41 is operated for a certain period of time in the first operating state in which electrolyzed water is produced from the concentrated water, impurities accumulate in the electrodes. A period of time is required to operate in a second operating state during which the contaminated wastewater is discharged. During that period, the electrolyzed water cannot be generated in the electrolyzer.
Therefore, two electrolytic treatment apparatuses 41 are installed, and the control panel 60 instructs one of the two electrolytic treatment apparatuses 41 to operate in the first operating state, and the remaining other electrolytic treatment apparatus 41. to operate in the second operating state.
By doing so, while the electrolysis device 41 is discharging wastewater, any other electrolysis device 41 is generating electrolyzed water in the first operating state. Therefore, the electrolyzed water can be generated without stopping the generation.
In Embodiment 2, the two electrolytic treatment apparatuses 41 may be alternately switched between the first operating state and the second operating state. One electrolysis device 41 may be instructed to operate in the second operating state.

INDUSTRIAL APPLICABILITY The present invention is suitable for purifying water, and most suitable for purifying bathtub drainage in bathing facilities.

10, 11 bath drainage purification device 20 pretreatment unit 21 drainage tank 21a drainage air diffusion blower 21b air diffusion pipe 21c water pump 22 screen 23 biological filtration tank 23a biological filtration air diffusion blower 23b air diffusion pipe 24 aeration tank pump 25 submerged membrane tank 25a Submerged membrane blower 25b Suction pump 25c Circulation pump 30 Reverse osmosis membrane processing unit 31 Relay tank 32 Filtration pump 33 Activated carbon filtration device 34 Check filter 35 High pressure pump 36 Reverse osmosis membrane device 37, 38, 39 Mixing device 40, 40x Return purification Part 41 Electrolytic treatment device 50 Post-treatment part 51 Treated water tank 51a Municipal water supply valve 51b Mixing device 51c Circulating pump 52 Water pump 53 Secondary treated water tank 53a Water level gauge 54a, 54b, 54c Water pump 55 Heat exchanger 56 Hot water tank 56a Water level Total 56b Heat exchanger 56c Circulating pump 57 Water pump 60 Control panel 61 Main control panel 62 Indoor panel 63 Outdoor panel M11 Raw water meter M12 Turbidity meter M21 pH meter M22 Conductivity meter M31 Water flow meter M32, M33 Conductivity meter M41 Residual chlorine Total P11, P41, P42 Circulation line P12, P21, P22, P23, P24, P31, P32 Piping W1 Bathtub water supply W2 Water bath supply water W3 Supply water

Claims (3)

A reverse osmosis membrane device that removes impurities from bath wastewater to be treated,
Electrolysis in which the electrolyzed water obtained by removing the ionized impurities from the concentrated water discharged from the reverse osmosis membrane device by causing the electrodes to which a voltage is applied to adsorb and remove the impurities is returned to the reverse osmosis membrane device as the water to be treated. a processor;
a high-pressure pump for pumping the water to be treated to the reverse osmosis membrane device;
a mixing device for adding a scale inhibitor to the water to be treated to the high-pressure pump;
and a water pump for feeding the treated water from the reverse osmosis membrane device to the bath for reuse as make-up water for the bath,
A storage tank for storing the water to be treated is provided on the upstream side of the reverse osmosis membrane device,
The electrolytic treatment device is a bath drainage purification device that feeds the electrolytically treated water to the storage tank as the water to be treated . 2. The bath wastewater purification system according to claim 1 , further comprising an activated carbon filtration device installed between said storage tank and said reverse osmosis membrane device. A plurality of the electrolytic treatment devices are installed in parallel,
instructing the plurality of electrolyzers to either a first operating state in which electrolyzed water is produced from concentrated water or a second operating state in which the polarity of the electrodes is reversed to discharge waste water containing impurities; 3. The bath wastewater purification apparatus according to claim 1, further comprising a control panel for operating one or more of said electrolytic treatment devices in said first operating state.

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