WO2013038766A1

WO2013038766A1 - Central water purification apparatus and water purification system

Info

Publication number: WO2013038766A1
Application number: PCT/JP2012/065874
Authority: WO
Inventors: 高城　壽雄; 丸木　祐治
Original assignee: 株式会社タカギ
Priority date: 2011-09-16
Filing date: 2012-06-21
Publication date: 2013-03-21
Also published as: JP2013063379A; JP5698630B2

Abstract

Provided are a central water purification apparatus that can remove impurities from tap water and can maintain the quality of the purified water up to the purified water-utilizing device that the user is using, and a water purification system using same. A central water purification apparatus (2), which is disposed at the entrance of tap water into one or multiple buildings (1), purifies the introduced tap water and supplies same to multiple purified water-utilizing devices, wherein the central water purification apparatus (2) passes the tap water through a purifying material to remove residual chlorine and other impurities therefrom and then adds chlorine to the purified water. A water purification system provided with: the central water purification apparatus (2) and a second water purification apparatus, which is disposed in a purified water-utilizing device (3) and removes chlorine from the purified water supplied by the central water purification apparatus (2) by passing the water through a second purifying material.

Description

Central water purification system and water purification system

The present invention relates to a central water purifier for purifying tap water and supplying purified water to a plurality of households or water purifiers and a water purifying system using the same.

In recent years, small water purifiers for the purpose of removing residual chlorine (hypochlorous acid), musty odor, turbidity, microorganisms and the like from tap water have become widespread.
In these water purifiers, residual chlorine in tap water, activated carbon that removes off-flavors and odors, ceramic filters, microfiltration membranes that remove turbidity and microorganisms, hollow fiber membranes, and the like were used.
When such a water purifier is provided in a residence or the like, it is often installed under a kitchen faucet or sink, and tap water has been purified to be suitable for drinking and cooking.

On the other hand, there was a need to use purified tap water in the entire building or the entire area of the building, or to purify well water and use it in the entire building or in the building. It is complicated to install. Therefore, a water purification system that attaches a large water purifier to the entrance for introducing tap water or the like into a building, purifies the tap water collectively, and supplies the entire building to water has started to spread.
These large water purifiers are also composed of activated carbon, ceramic filters, microfiltration membranes, etc. like the small water purifiers. By passing these, residual chlorine and turbidity in tap water are removed, and multiple water purifiers in the building are removed. Supply purified water to the place where it is used.

The conventional water purification system consists of a central water purification device installed near the entrance for introducing tap water, etc. into the building, pipes attached to the house, etc., and the kitchen, bathroom, washroom, laundry, It consists of water purifiers such as faucets provided in toilets, water heaters and outdoor water intakes.

In such a water purification system, the central water purification apparatus is arranged connected to a water pipe branched from a water main and attached to a house. The central water purification device contains a purification material composed of activated carbon, ceramic filter, microfiltration membrane, etc. Tap water supplied from the main water pipe passes through this purification material, residual chlorine, turbidity, Metal ions, microorganisms, chemical substances, etc. are removed to obtain purified water.
The purified water treated by the central water purification apparatus passed through the pipes and was supplied to each household water purifier and each water purifying equipment provided at the place where the water was used.

However, in such a water purification system, the water quality of the purified water purified by the central water purification device is guaranteed immediately after being processed by the central water purification device, but bacteria are propagated in the pipes up to the water purification equipment, There is a possibility that bacteria and impurities may invade from the joint portion and the like, and there is a possibility that it is not suitable for drinking at the time of use.

In order to solve such a problem, Patent Document 1 discloses that a secondary water provided in a water purifying apparatus is used to remove other impurities without removing residual chlorine with a central water purification device, or remove only a part of residual chlorine. A water purification system is described that can maintain the sterilization effect of purified water in the pipes up to the water purification equipment by removing residual chlorine with a water purification device.

Japanese Patent No. 3951227

Activated carbon is suitable for removing impurities in tap water, but activated carbon also removes residual chlorine in tap water, so activated carbon cannot be used in the central water purification apparatus of Patent Document 1, and impurities other than chlorine. Water that has not been removed flows into the pipes up to the water purifying equipment. In addition, even when activated carbon is used as part of the central water purification device, water that has not passed through activated carbon is also supplied downstream, so water that has not been freed of impurities other than chlorine is also piped to the water purification equipment. Will be swept away.

Therefore, in the purification of tap water in the water purification system, the rate of purification in the secondary water purification device increases, the amount of filtered water per unit time is insufficient, and the product life of the purification material used in the secondary water purification device is shortened. Or the secondary water purification device had to be enlarged.
In addition, if the secondary water purification device is not used in each household or each water purifier, or if the water purifier cartridge is removed and used, water containing impurities that have not been sufficiently filtered by the central water purifier There was also a risk of water being discharged.

The present invention has been made to solve the above-mentioned problems, can remove impurities from tap water, and can maintain the quality of purified water up to the water purification equipment used by the user. It is an object to provide a central water purification apparatus and a water purification system using the same.

In the present invention, means for solving the above problems are as follows.
A first invention is a central water purification apparatus that is disposed at an entrance of tap water to one or a plurality of buildings, purifies the introduced tap water, and supplies the purified water to a plurality of water purification appliances. Thus, residual chlorine and other impurities are removed from the tap water, and then chlorine is added to the purified water.

According to a second aspect of the present invention, there is provided an introduction section for introducing the tap water from a water pipe, a purification section for removing residual chlorine and mold odor from the tap water through the purification material containing activated carbon, and the purification section. It is characterized by comprising a chlorine addition part for adding chlorine to the purified water disposed on the downstream side and treated by the purification part, and a delivery part for sending the purified water to which this chlorine has been added.

A third invention is a central water purification apparatus that purifies the introduced tap water and supplies it to a plurality of water purification appliances, and passes the purification material through the tap water to remove residual chlorine and other impurities. Chlorine water purification system that adds chlorine to purified water and sends it to each of the above-mentioned water purification appliances, and the above purification material to the raw water system and / or tap water that is sent to tap water usage equipment without passing the purification material to tap water And a water purification system for removing residual chlorine and sending it to the tap water-using device.

4th invention is the secondary water purifier which removes chlorine from the central water purifier of 1st invention, and the said water purifier use instrument, and passes a secondary purifier and supplied from the said central water purifier It is a water purification system characterized by having an apparatus.

5th invention is the secondary water purification system which removes chlorine from the central water purifier of 2nd invention, and the said water purifier use instrument, and passes a secondary purification material, and removes chlorine from the purified water supplied from the said central water purifier The said secondary purification material provided with an apparatus and the activated carbon is a water purification system characterized by removing mold odor from the said purified water.

The sixth invention is characterized in that it has a raw water system that sends tap water to a tap water use device without going through the central water purification apparatus.

According to the first invention, a central water purification apparatus that is disposed at an inlet of tap water to one or a plurality of buildings, purifies the introduced tap water, and supplies the purified water to a plurality of water purification appliances. Passing through and removing residual chlorine and other impurities from the tap water, and then adding chlorine to this purified water prevents bacteria from growing in the piping from the central water purification device to the water purification equipment. In addition to being able to supply safe purified water, the rate of purification in the secondary water purification device can be reduced and the life can be extended.

According to 2nd invention, the introduction part which introduce | transduces the said tap water from water supply piping, the purification | cleaning part which allows the said purification | cleaning material containing activated carbon to pass through, and removes residual chlorine and a mold odor from the said tap water, and the said purification | cleaning Residual chlorine and mold odor were removed by providing a chlorine addition part for adding chlorine to the purified water treated by the purification part disposed downstream of the part and a delivery part for sending the purified water to which this chlorine was added. Purified water can be provided.

According to the third invention, a central water purification apparatus that purifies the introduced tap water and supplies the purified water to a plurality of water purification appliances, removes residual chlorine and other impurities by passing the purification material through the tap water, Next, chlorine is added to this purified water, and the purified chlorine system that is sent to each of the purified water use devices, and the raw water system and / or the tap water that is sent to the used tap water device without passing the purification material to the tap water, Purified water without tap water or chlorine added to tap water use equipment that does not require safe water purification by having a water purification system that passes the purification material to remove residual chlorine and sends it to the above tap water use equipment The consumption of purified water to which chlorine has been added can be reduced by extending the service life of the central water purification device and the running cost of the water purification system.

According to 4th invention, the secondary water purifier which removes chlorine from the central water purifier of 1st invention, and the said purified water use instrument, and removes chlorine from the purified water supplied from the said central water purifier by the secondary purifier In addition to being able to prevent bacteria from growing in the piping from the central water purification device to the water purification equipment, remove chlorine with the secondary water purification device, and supply safe water to the user. It is possible to extend the life by reducing the purification rate in the secondary water purification device.

According to 5th invention, it distributes to the central water purifier of 2nd invention, and the said water purifier apparatus, passes a secondary purification material, and removes chlorine from the purified water supplied from the said central water purifier. The said secondary purification material provided with a secondary water purification apparatus and containing activated carbon can provide the purified water from which the residual chlorine and the mold odor were removed by removing the mold odor from the said purified water.

According to the sixth aspect of the present invention, by having a raw water system that sends tap water to the tap water use equipment without going through the central water purification apparatus, tap water is supplied to the tap water use equipment that does not require safe water purification. By doing so, consumption of purified water to which chlorine is added can be reduced, and the running cost of the water purification system can be reduced while extending the life of the central water purification device.

It is a mimetic diagram of a water purification system concerning a first embodiment of the present invention. It is a schematic diagram of the central water purification apparatus of the water purification system. It is a figure which shows the activated carbon filter of the central water purification apparatus, (a) is a partially cutaway perspective view, (b) is explanatory drawing which shows the flow of water. It is a partially cutaway perspective view showing a membrane module of the central water purification apparatus. It is a figure which shows the hollow fiber membrane of the membrane module, (a) is explanatory drawing of an internal pressure type, (b) is explanatory drawing of an external pressure type. It is a schematic diagram of the water purification system which concerns on Example 3 of another aspect of this invention. It is a schematic diagram of the water purification system which concerns on Example 4 of another aspect of this invention. It is a table | surface which shows the example of another aspect of this invention.

Hereinafter, the water purification system according to the first embodiment of the present invention will be described.
This water purification system is for purifying and using tap water with a plurality of appliances provided inside and outside buildings such as buildings, detached houses, and apartment houses.
As shown in FIG. 1, in this water purification system, a central water purification device 2 is arranged so as to be connected to a water pipe branched from a water main and attached to a building 1, and all tap water used in the building 1 is disposed. It passes through the central water purification device 2. This central water purification device 2 has a built-in purification material, removes residual chlorine and other impurities from the introduced tap water, and then adds chlorine to the purified water thus obtained to use the purified water ).
In addition, even if it installs in the upstream of the central water purifier 2, the water meter which is a measuring device which measures the usage-amount of water is installed in the central water purifier 2, the downstream of the central water purifier 2, for example, You may install in each home or office individually.

The water purification equipment 3 is a

faucet

4, 8, 9 installed in the kitchen, bathroom, washroom, laundry, toilet, water heater, outdoor water intake, etc., which are the water purification use points of the building, water heater 5, toilet 6, The washing machine 7 etc. can be illustrated.
Each water purifying apparatus 3 is provided with a secondary water purifier for removing chlorine added from the purified water supplied from the central water purifier 2, and can be used by discharging the purified water from which chlorine has been removed. It is like that.
From the central water purification apparatus 2 to each water purification use instrument, it is connected by piping (chlorine water purification system 10).

In addition, the water purification system of the present invention includes a central water purification device 2 disposed at the entrance of a water pipe of an apartment building such as an apartment or an apartment, and a secondary water purification device disposed at each home or office. A water purification system having a central water purifier arranged at the entrance of water pipes to a plurality of detached houses and supplying purified water collectively to the plurality of detached houses, and a secondary water purification apparatus disposed in each detached house, and one or more Also included are secondary water purifiers that are located in detached houses and / or one or more collective buildings. In addition, the detached house includes not only a residential detached house but also an office detached house.
The central water purification apparatus of this invention can be used for the various water purification systems illustrated above. Furthermore, when there is much usage-amount of purified water, you may employ | adopt the purified water system which installed the some central water purifier in parallel.

As shown in FIGS. 2 to 5, the central water purification apparatus 2 includes a purification material (activated carbon filter 11) made of activated carbon and a purification material (membrane module 13) made of a hollow fiber membrane. Residual chlorine, musty odor, turbidity, metal ions, microorganisms, and chemical substances can be removed from tap water that has passed through.
As shown in FIG. 3 (a), the purification material made of activated carbon is formed into a cylindrical shape as a whole around the inner core 11a having a water permeability formed by molding a synthetic resin, and the outer nonwoven fabric 11b and the inner nonwoven fabric 11d. The activated carbon layer 11c sandwiched between the two is disposed, and the activated carbon filter 11 has a closed bottom surface. The activated carbon layer 11c uses activated carbon molded into a cylindrical shape, or is filled with granular activated carbon so as to have a cylindrical shape as a whole.
As shown in FIG. 3 (b), this activated carbon filter 11 is accommodated in a case (not shown), and the tap water introduced into the case passes through the activated carbon filter 11 from the outer peripheral side to the central portion, and is downstream. Sent to the side.
When the introduced tap water passes through the activated carbon filter 11, residual chlorine and mold odor contained in the tap water are removed.
In addition, the purification material which consists of activated carbon is not limited to the form of the above-mentioned activated carbon filter, The other form which uses activated carbon as a purification material may be sufficient.

Residual chlorine is chlorine introduced into water at a water purification plant, and contains hypochlorous acid and hypochlorite ions generated when chlorine is dissolved in water. Moreover, the purification material containing activated carbon also removes trihalomethane such as chloroform and bromoform generated from chlorine combined with organic substances in water from tap water.
In general, the concentration of chlorine in tap water is about 0.6 to 1.3 mg / l. In this central water purification device 2, the purification water (for example, activated carbon filter 11) made of activated carbon is passed to the tap water. For example, about 80% of the residual chlorine contained is removed. The residual chlorine removal rate by the activated carbon filter 11 is preferably 60% or more, more preferably 70% or more, particularly preferably 80% or more. Thereby, the density | concentration of the residual chlorine contained in the purification material which consists of activated carbon, for example, the activated carbon filter 11, can be made into about 0.2 mg / l or less. The concentration of residual chlorine contained in water is more preferably 0.1 mg / l or less, and even more preferably 0.05 mg / l or less.
The residual chlorine concentration or chlorine concentration refers to the total concentration of chlorine molecules, hypochlorous acid, and hypochlorite ions in water.
The removal of mold odor means diosmin ((4S, 4aS, 8aR) -4,8a-dimethyl-1,2,3,4,5,6,7,8-octahydronaphthalene- 4a-ol) and / or 2-MIB (2-methylisoborneol) is removed from tap water.

As shown in FIG. 4, as a purification material comprising a hollow fiber membrane, a number of cylindrical hollow fiber membranes 12 having a uniform length are used, and a membrane module 13 accommodated in parallel in a cylindrical case is formed. Yes. The hollow fiber membrane 12 used is made of polyvinylidene fluoride (PVDF) having high strength and excellent chemical resistance, and a membrane having a molecular weight cut off of 150,000 Da is used. About 5000 hollow fiber membranes 12 are accommodated in the membrane module 13.
As shown in FIG. 5 (b), in this membrane module 13, when tap water supplied to the outer peripheral side of each hollow fiber membrane 12 accommodated in parallel passes through the hollow fiber membrane 12 to the center, An external pressure filtration method that can remove protozoa such as Cryptosporidium, bacteria such as E. coli, and turbidity is adopted.
Contrary to this, an internal pressure filtration method (FIG. 5A) in which tap water supplied to the center of each hollow fiber membrane 12 is allowed to pass to the outer peripheral side may be employed.
In addition, the purification material which consists of a hollow fiber membrane is not limited to the form of the above-mentioned membrane module, The other form which uses a hollow fiber membrane as a purification material may be sufficient.

As the purification material of the central water purification device 2, RO membrane, UF membrane, activated carbon, zeolite, hollow fiber membrane, etc. can be used, and it is preferable to use at least activated carbon to remove the mold odor, and impurities In order to sufficiently perform the filtration, it is preferable to use a hollow fiber membrane. For example, activated carbon and a hollow fiber membrane are preferably used in combination.
In addition, even if each purification material is stored in a separate member to be an individual purification member, and the individual purification members are connected to each other by a pipe or the like and disposed in the central water purification apparatus 2, two or more purification materials are 1 It may be stored in one member to form a collective purification member, and the collective purification member may be disposed in the central water purification apparatus 2. Further, the individual purification member and the collective purification member may be used in combination, and may be arranged in the central water purification apparatus 2 by connecting them with a pipe or the like.
When the activated carbon and the hollow fiber membrane are stored in one member to form a collective purification member, it is preferable that the water passing through the purification member always passes through both the activated carbon and the hollow fiber membrane. . In this case, the activated carbon upstream type member having activated carbon as the upstream side and the hollow fiber membrane as the downstream side may be a hollow fiber membrane upstream type member having the hollow fiber membrane as the upstream side and activated carbon as the downstream side.

Further, as shown in FIG. 2, the central water purification apparatus has a chlorine addition unit including a hypochlorous acid tank 14 and a metering pump 15.
The hypochlorous acid tank 14 stores a sodium hypochlorite aqueous solution, and a purification material (for example, activated carbon filter 11) made of activated carbon and a purification material using a hollow fiber membrane via a metering pump 15 and a pipe. Sodium hypochlorite can be added to the purified water that has passed (for example, the membrane module 13).
The concentration of the solution in the hypochlorous acid tank 14 and the operation of the metering pump 15 are adjusted so that the chlorine concentration of the purified water to which sodium hypochlorite is added becomes 0.3 to 1 mg / l. By adding sodium hypochlorite, it ionizes into hypochlorite ions in water and part of it reacts with water to form hypochlorous acid. Propagation of bacteria in the pipes up to the use device 3 can be prevented, and the safety of purified water can be maintained until the user uses it for drinking.
The chlorine concentration of purified water to which sodium hypochlorite has been added is 0.4 mg / l or more, especially 0.5 mg as the lower limit value because of the relationship between sterilization power and ease of chlorine removal in the secondary water purification device. / L or more, and the upper limit is further preferably 0.8 mg / l or less, particularly preferably 0.7 mg / l or less.

As another modification, a hypochlorous acid aqueous solution may be stored in a tank instead of the sodium hypochlorite aqueous solution, and this may be added to the purified water by the metering pump 15.
Moreover, you may add hypochlorous acid to purified water with a metering pump using the apparatus which electrolyzes sodium chloride aqueous solution and produces | generates hypochlorous acid.
Like these, increasing hypochlorous acid or hypochlorite ion in water is called adding chlorine.
Among these, it is more preferable to use sodium hypochlorite which is easily available.

The secondary water purifier to which the purified water to which chlorine is added is supplied is attached to the water purification apparatus 3 provided inside or outside the building, or is provided integrally therewith. The secondary water purification apparatus includes a secondary purification material capable of removing at least chlorine in the purified water.
It is preferable to remove 60% or more, further 70% or more, particularly 80% or more of the residual chlorine by this secondary water purifier. In addition, the concentration of residual chlorine contained in the water that has passed through the secondary water purifier is 0.2 mg / l or less, 0.1 mg / l or less, further 0.1 mg / l or less, particularly 0.05 mg / l or less. It is preferable to do so. Residual chlorine concentration or chlorine concentration means the total concentration of chlorine molecules, hypochlorous acid, and hypochlorite ions in water.
A shower head as disclosed in, for example, Japanese Patent No. 3799007 and Japanese Patent No. 4648507 can be used for this secondary water purification apparatus. As described above, the secondary water purifier may be integrated with the faucet (equipment for water purification) or may be externally attached. However, in order to reduce the installation space, the secondary water purifier is used. Is preferred.
In the water purification system of the present invention, impurities are removed in advance by the central water purification device, and the secondary water purification device only needs to remove at least chlorine. Therefore, by using a device that is integrated with a faucet or the like (equipment for water purification) as the secondary water purification device, the hygiene of the entire water purification system, space saving of the secondary water purification device, the entire water purification system and / or the secondary water purification device Cost reduction.

The secondary water purification apparatus incorporates a secondary purification material that removes chlorine and other impurities from the purified water.
For this secondary purification material, activated carbon, RO membrane, sterilizing ceramic, ion exchange resin, zeolite, calcium sulfite, etc. can be used. In order to add chlorine removal performance, it is necessary to use at least one of activated carbon or calcium sulfite. . Since calcium sulfite dissolves in water to remove chlorine, it is preferable to use activated carbon for the water purification apparatus 3 used for long-term drinking. Moreover, when the secondary purification material containing activated carbon is used, the mold odor can be further removed from the purified water.
In addition, in order to suppress the increase in the size of the secondary water purification device, increase the chlorine removal capacity per unit water volume, and suppress the decrease in the chlorine removal capacity over time of use, as the secondary purification material, short fibrous activated carbon and It is preferable to use in combination with particulate activated carbon.

In the water purification system of the present invention, since the purified water already purified by the central water purification device 2 is supplied to the secondary water purification device, it is sufficient that at least the chlorine can be removed by the secondary water purification device, and the purification required for the secondary purification material. Capabilities can be relatively small.
In addition, it is not necessary for the water purification apparatus 3 to be used to purify all of the supplied purified water by passing through the secondary water purification apparatus, and a part of the purified water can be used without passing through the secondary water purification apparatus. May be. In addition, as in the shower head described in Japanese Patent No. 3799007, a flow for switching between a flow path for purifying the purified water to be passed through and a flow path for discharging without passing through the secondary purifier. A path switching valve may be provided.

Hereinafter, other structures of the central water purification apparatus 2 and the water purification system will be described.
As shown in FIG. 2, the tap water supplied from the water main passes through a purification material (for example, activated carbon filter 11) made of activated carbon to remove residual chlorine and mold odor, and flows into the raw water tank 16, where You can also save.
A pipe from the flocculant tank 17 is connected in the middle of the pipe from the purification material (for example, the activated carbon filter 11) made of activated carbon to the raw water tank 16. The flocculant tank 17 stores a flocculant that is a chemical for aggregating and removing unnecessary ionic components such as heavy metals and nitrite nitrogen in water, and is added to the water by the flocculant pump 18. .

Water in the raw water tank 16 is sent by a raw water pump 19 to a purification material (for example, a membrane module 13) made of a hollow fiber membrane, and protozoa, bacteria, and turbidity are removed by the hollow fiber membrane 12.
A pipe from the hypochlorous acid tank 14 is connected in the middle of the pipe for sending purified water from the purification material (for example, the membrane module 13) made of a hollow fiber membrane to the outside of the central water purification device 2. Sodium hypochlorite can be added to achieve a constant chlorine concentration.

In each purified water use equipment 3 to which purified water is supplied from the central water purification apparatus 2 via a pipe, at least chlorine is removed when the purified water passes through the secondary purification material of the secondary water purification apparatus, and is used for each application. .

In addition, the position of the purification material (for example, activated carbon filter 11) which consists of activated carbon in the central water purification apparatus 2 is upstream of the purification material (for example, membrane module 13) which consists of hollow fiber membranes, for example, piping from the flocculant tank 17 In addition to the upstream side of the merging portion, the upstream side (11 ') of the merging portion with the pipe from the hypochlorous acid tank 14 on the downstream side of the purification material (for example, the membrane module 13) made of a hollow fiber membrane may be used.
If the position of the purification material made of activated carbon (for example, activated carbon filter 11) is located upstream of the purification material made of hollow fiber membrane (for example, membrane module 13), impurities can be removed to some extent by the purification material made of activated carbon, so that the hollow fiber membrane It is possible to increase the filtration life of the purification material (for example, the membrane module 13) made of, and to reduce the size and / or the device cost of the purification material (for example, the membrane module 13) made of the hollow fiber membrane. Further, if the position of the purification material made of activated carbon (for example, activated carbon filter 11 ′) is located downstream of the purification material made of hollow fiber membrane (for example, membrane module 13), the purification material made of hollow fiber membrane (for example, membrane module 13) Since the water to be passed contains chlorine, the range of the chlorine-containing region in the central water purification device is widened, and there is a hygienic effect such as suppressing the proliferation of germs in the central water purification device.

The central water purification apparatus 2 of the present invention is provided with a backwashing apparatus that flushes and discharges impurities accumulated in the membrane module 13.
In the backwash tank 20 of the backwash device, purified water to which chlorine has been added can be branched and stored by a three-way valve 28.
The water stored in the backwash tank 20 flows into the membrane module 13 from the outlet side by the backwash pump 21, and the accumulated matter is washed away while flowing back through the hollow fiber membrane 12. This water is drained through a backwash drain pipe 22 connected to the membrane module 13. Further, the water that has washed the downstream side of the hollow fiber membrane 12 passes through the backwash drainage pipe 23 connected to the membrane module 13, joins the backwash drainage pipe 22, and is drained.
In order to enhance the sterilizing power of the purified water used for backwashing, hypochlorous acid is supplied from the hypochlorous acid tank 14 by the backwash hypochlorous acid pump 24 to the purified water passing through the pipe flowing back from the backwash tank 20 to the membrane module 13. Sodium is added.
When the water in which the membrane module 13 has been washed contains substances that are legally prohibited from flowing as wastewater, the reducing agent is added from the reducing agent tank 25 by the reducing agent pump 26, and the concentration becomes below a predetermined concentration. So that it can be drained after being chemically treated.
An automatic valve 29 or a cock that opens and closes the valve with air pressure is provided at a predetermined position in the piping path so that the flow of raw water and purified water can be controlled at each stage of water purification and back washing of the membrane module. Yes.

In such a central water purification apparatus 2 and a water purification system, since the purification material of the central water purification apparatus 2 removes impurities from tap water, it is possible to supply highly safe purified water, and the purification burden of the secondary water purification apparatus. It can be reduced and the life can be extended.
Moreover, by adding chlorine to the purified water purified by the central water purification device 2 and removing chlorine from the purified water by the secondary water purification device, the water is purified from the central water purification device by the sterilizing power of hypochlorous acid and hypochlorite ions. Bacteria can be prevented from breeding in the pipes up to the equipment used.
In addition, each structure, prescription | regulation, effect, etc. which were demonstrated in 1st embodiment are applicable individually to the whole this invention, for example, can also be applied in the following another aspect.

<Another aspect>
In the water purification system of the first embodiment, all the tap water used in the building 1 is purified by the central water purification device 2, and then chlorine is added and supplied to each water purification equipment 3.
However, it is not always necessary to purify all the tap water used in the building 1 and add chlorine, branch the pipe on the upstream side of the purification material, and do not need purified water without purifying part of the tap water. You may provide the raw | natural water system | strain 27 sent out to a tap water use instrument. This raw water system 27 may be provided inside the central water purification apparatus 2 (not shown), or may be provided as an independent piping system that does not pass through the central water purification apparatus (FIGS. 6 and 7).
Moreover, in addition to the raw water system 27 or instead of the raw water system 27, the piping is branched on the downstream side of the purification material and the upstream side of the chlorine addition section, and chlorine is added to a part of the purified water that has passed through the purification material. You may provide the water purification system which sends out to tap water use appliances (not shown).

Thus, in addition to the chlorine water purification system 10 that adds chlorine to the purified water and sends it to the water purification equipment, by providing the raw water system 27 or the water purification system, water supply equipment that does not require sanitary water purification in particular. Can supply tap water or purified water without adding chlorine, and can reduce the consumption of purified water with added chlorine, thus extending the life of the central water purification system and lowering the running cost of the purified water system .
FIG. 8 shows an example of a water purification system including the chlorine water purification system 10 and the raw water system 27 or the water purification system.

FIG. 8 shows an example 1 of a water purification system of a building 1 for supplying water to a kitchen faucet 4, a bathroom faucet 9, a bathroom faucet 8, a shower head, a washing machine 7 in a laundry, and a toilet 6 in a toilet. 9 is a table showing Example 8. In addition, in the kitchen, the washroom, and the bathroom, a water heater 5 that can heat and supply water is provided independently of other faucets and the like.
In the kitchen, since water is used for eating and drinking, the most sanitary and safe water is required. In the bathroom, it is necessary to use sanitary and safe water next to the kitchen because it is used for purposes such as toothpaste and gargle. In the bathroom, water is in direct contact with human skin and hair, so the need for sanitary and safe water is high after the toilet. Since water used in a washing machine indirectly touches human skin through clothes, it is desirable that the water is sanitary and safe next to the bathroom. On the other hand, as for the water used for the toilet bowl, it is basically unnecessary to use sanitary and safe water except when a Washlet (registered trademark) is provided.

From the above, in Example 1, the toilet bowl 6 of the toilet is connected to the raw water system 27 or the purified water system, and other appliances are connected to the chlorinated water system 10.
Moreover, in Example 5, in Example 1, the kitchen, the washroom, and the bathroom water heater 5 are connected to the raw water system 27 or the purified water system.

In Example 2, the toilet bowl 6 and the washing machine 7 in the laundry are connected to the raw water system 27 or the water purification system, and other appliances are connected to the chlorine water purification system 10.
Moreover, in Example 6, the water heater 5 of a kitchen, a washroom, and a bathroom in Example 2 is connected with the raw | natural water system 27 or the purified water system.

As shown in FIG. 6, in Example 3, the toilet 6 in the toilet, the washing machine 7 in the laundry, the bathroom faucet 8 and the shower head are connected to the raw water system 27 or the water purification system, and the kitchen faucet 4 and the bathroom faucet. 9. A water heater 5 for a kitchen, a washroom, and a bathroom is connected to the chlorine water purification system 10.
In Example 7, in Example 3, the water heater 5 in the kitchen, washroom, and bathroom is connected to the raw water system 27 or the purified water system.

As shown in FIG. 7, in Example 4, the toilet stool 6, the washing machine 7 in the laundry, the bathroom faucet 8 and the shower head, and the bathroom faucet 9 are connected to the raw water system 27 or the water purification system, and the kitchen faucet. A water heater in the kitchen, washroom, and bathroom is connected to the chlorine water purification system 10.
In Example 8, the water heater 5 in the kitchen, washroom, and bathroom in Example 4 is connected to the raw water system 27 or the water purification system, and only the kitchen faucet is connected to the chlorine water purification system 10.

In this way, consumption of purified water with added chlorine can be reduced by selectively supplying raw water, purified water, and purified water with added chlorine according to the usage situation of each household and each appliance. While extending the lifetime of a water purifier, the running cost of a water purification system can be reduced.

DESCRIPTION OF SYMBOLS 1 Building 2 Central water purifier 3 Water purification equipment 4 Faucet (kitchen) 5 Water heater 6 Toilet bowl 7 Washing machine 8 Faucet 9 11c Activated carbon layer 11d Inner nonwoven fabric 12 Hollow fiber membrane 13 Membrane module 14 Hypochlorous acid tank 15 Metering pump 16 Raw water tank 17 Coagulant tank 18 Coagulant pump 19 Raw water pump 20 Backwash tank 21 Backwash pump 22 Backwash drain pipe 23 Backwash drain pipe 24 Backwash hypochlorous acid pump 25 Reducing agent tank 26 Reducing agent pump 27 Raw water system 28 Three-way valve 29 Automatic valve

Claims

A central water purification device that is disposed at the entrance of tap water to one or more buildings, purifies the introduced tap water, and supplies the purified water to a plurality of water purification appliances.
Pass the purification material to remove residual chlorine and other impurities from the tap water,
Next, a central water purification apparatus characterized by adding chlorine to the purified water.
An introduction part for introducing the tap water from the water pipe;
A purification unit that passes the purification material containing activated carbon and removes residual chlorine and musty odor from the tap water;
A chlorine addition unit for adding chlorine to the purified water disposed on the downstream side of the purification unit and treated by the purification unit;
The central water purifier according to claim 1, further comprising a delivery unit that delivers the purified water to which chlorine has been added.
A central water purification device that purifies the introduced tap water and supplies it to a plurality of water purification appliances.
Chlorine water purification system that passes purification material through tap water to remove residual chlorine and other impurities, then adds chlorine to this purified water, and sends it to each of the above purified water use devices,
A raw water system for sending tap water to the tap water use equipment without passing the purification material and / or a water purification system for passing the purification material to tap water to remove residual chlorine and sending to the tap water use equipment Central water purifier characterized by having.
A central water purification device according to claim 1;
A water purification system, comprising: a secondary water purification device that is disposed in the water purification appliance and passes secondary purification material to remove chlorine from the purified water supplied from the central water purification device.
A central water purification device according to claim 2;
A secondary water purifier that is disposed in the water purification appliance and that removes chlorine from the purified water supplied from the central water purifier through the secondary purification material,
The said secondary purification material containing activated carbon removes musty odor from the said purified water, The water purification system characterized by the above-mentioned.
5. The water purification system according to claim 4, further comprising: a raw water system for sending tap water to the tap water use equipment without going through the central water purification apparatus.