WO2013065358A1

WO2013065358A1 - Water purification apparatus and water purification system

Info

Publication number: WO2013065358A1
Application number: PCT/JP2012/067532
Authority: WO
Inventors: 丸木　祐治
Original assignee: 株式会社タカギ
Priority date: 2011-11-04
Filing date: 2012-07-10
Publication date: 2013-05-10
Also published as: JP2013094762A; JP5586565B2

Abstract

A water purification apparatus used for well water, etc. with which the volume of water treated with a RO membrane is kept to a necessary minimum, the size of the apparatus is reduced, and running cost is reduced. The water purification apparatus comprises: a household water system (3) that is connected to the downstream side after the water has passed through a first purification unit (7) disposed downstream of the water intake unit and a second purification unit (8) disposed downstream of the first purification unit (7); and a drinking water system (4) that branches from the household water system (3) on the downstream side of the second purification unit (8) and is connected to the downstream side after the water has passed through a third purification unit (9). The first purification unit (7) is provided with at least one from among active carbon, ion exchange filters, sand filters, and nucleation unit filters. The second purification unit (8) is provided with an UF membrane and/or MF membrane. The third purification unit (9) is provided with a RO membrane and/or NF membrane.

Description

Water purification device and water purification system

The present invention relates to a water purifier that purifies water taken from a water source or a drainage source, and relates to a water purifier that can supply water to an apartment house or a village, and a water purifying system using the water purifier.

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 suspended substances 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 composed of activated carbon, ceramic filters, MF membranes (microfiltration membranes), etc., just like small water purifiers. By passing these, residual chlorine and suspended substances in tap water are removed, and buildings are built. Purified water is supplied to multiple water purification locations inside.

As shown in FIG. 2, the conventional water purification system is a central water purification device 20 provided near the entrance for introducing tap water or the like into the building 1, a pipe 21 attached to a house, etc., and a place where water is used. It consists of a water purifying apparatus 22 such as a faucet provided in a kitchen, bathroom, washroom, laundry, toilet, water heater, outdoor water intake, and the like.

In such a water purification system, the central water purification apparatus 20 is connected to a water supply pipe branched from a water main and attached to a house. The central water purification apparatus 20 contains a purification material composed of activated carbon, a ceramic filter, an MF membrane, and the like. Tap water supplied from the water main is passed through the purification material to obtain residual chlorine and suspended substances. , Ions, microorganisms, chemical substances, etc. are removed to become purified water.
The purified water treated by the central water purification apparatus 20 passes through the pipe 21 and is supplied to each purified water use device 22 provided at the purified water use place of each household.

When such a water purification system is used for the purification of well water with high hardness and containing salt and heavy metals, the removal of salt and the like can be sufficiently performed only by treatment with the MF membrane or the like of the central water purification device 20. There wasn't.
Therefore, in order to remove salt from a water source containing salt and use it for drinking, there has been a water purifier equipped with an RO membrane (reverse osmosis membrane) instead of an MF membrane (Patent Document 1).
However, in order to treat water with the RO membrane, a high-pressure pump that pressurizes the water is required, which is expensive, and requires a large amount of dilution water to discard the concentrated water that is generated. Running costs such as chemical cleaning of the membrane are required.
In the water purifier of Patent Document 1, since the water roughly filtered by the sand filter and the check filter is filtered by the RO membrane, the RO membrane cannot be removed not only by the salt content but also by the sand filter and the check filter. In other words, bacteria, protozoa, colloidal substances and the like are removed from water, and the life of the RO membrane has been shortened.

Therefore, salt-containing water is filtered through an MF membrane or UF membrane (ultrafiltration membrane), bacteria and protozoa are removed from the water, and then this water is treated with an RO membrane or NF membrane (nanofiltration membrane) to obtain salinity. There was a water purifier for removing water (Patent Literature 2, Patent Literature 3).
Although these water purifiers were able to prolong the life of the RO membrane, the water used in one building is all treated with the RO membrane without distinguishing what kind of application it is used for. The running cost of the water purifier was unnecessarily high.

Japanese Patent No. 2797075 JP 2005-185985 A JP 2007-24503 A

The present invention has been made to solve the above problems, has high hardness, and in a water purifier used for well water containing salt or heavy metals, the amount of water to be treated with the RO membrane is minimized, It is an object of the present invention to provide a water purifier capable of reducing the size of the apparatus and reducing the running cost, and a water purifying system using the same.

In the present invention, means for solving the above problems are as follows.
The first invention is a water purifier arranged at an inlet of raw water whose source is well water or the like to one or a plurality of buildings, and purifies the introduced raw water and supplies it to a plurality of water using instruments. While having a domestic water system connected to the downstream side via the first purification unit arranged downstream of the water intake unit and the second purification unit arranged downstream of the first purification unit, A drinking water system branched from the domestic water system downstream of the second purification unit and connected to the downstream side via the third purification unit, the first purification unit comprising activated carbon, an ion exchange filter; , A sand filter, and a nucleation unit filter, wherein the second purification unit includes a UF membrane and / or an MF membrane, and the third purification unit includes an RO membrane and / or Alternatively, an NF film is provided.

The second invention is a water purification apparatus that is disposed at an inlet of raw water whose supply source is well water or the like to one or a plurality of buildings, purifies the introduced raw water, and supplies the purified water to a plurality of water use instruments. While having a domestic water system connected to the downstream side via the first purification unit arranged downstream of the water intake unit and the second purification unit arranged downstream of the first purification unit, The drinking water system is branched from the domestic water system downstream of the second purification unit and connected to the downstream side via the third purification unit, the first purification unit includes mold odor, calcium, A purification material for removing at least one of impurities that clog the second purification unit and / or the third purification unit, and the second purification unit comprises a purification material for removing at least one of bacteria and protozoa. The third purification unit includes the first purification unit and the second purification unit. Than purification material parts, characterized in that the salt removal rate comprises a high purification material.

3rd invention provides the water receiving tank which can store water downstream from the said 2nd purification part of the said domestic water system, The said drinking water system is connected to the said water receiving tank in the upstream, It is characterized by the above-mentioned. To do.

The fourth invention is characterized in that a chlorine addition section for adding chlorine to water is provided in the route of the domestic water system and / or the drinking water system.

5th invention is a water purification system which has a water purifier of this invention, Comprising: The said domestic water system is connected to the 1 or more water-purifying use equipment used for the purposes other than drinking on the downstream side, The said drinking water system Is characterized in that it is connected to one or more potable water appliances for drinking water downstream.

The sixth invention is characterized in that the water purifying apparatus and / or the potable water using apparatus includes a chlorine removing device having a purifying material for removing chlorine from the passing water.

According to the first invention, the first purification unit disposed downstream of the water intake unit and the second purification unit disposed downstream of the first purification unit are connected to the downstream side. And a drinking water system that branches from the domestic water system downstream of the second purification unit and is connected to the downstream side via the third purification unit. The unit includes at least one of activated carbon, an ion exchange filter, a sand filter, and a nucleation unit filter, the second purification unit includes a UF membrane and / or an MF membrane, and the third Since the purification unit is provided with the RO membrane and / or NF membrane, the third purification unit purifies only the water used for drinking, so the amount of RO membrane and / or NF membrane used by the third purification unit is the minimum necessary. Can reduce the running cost and life. It is possible to prolong the, it is possible to downsize the apparatus of the third purification unit.

Further, the drinking water supplied from the drinking water system is roughly filtered by the first purification unit and purified by the UF membrane and / or the MF membrane of the second purification unit before being purified by the third purification unit. Therefore, the RO membrane and / or the NF membrane can be hardly clogged, the life can be prolonged, and the waste amount of concentrated water generated by reverse osmosis in the third purification section can be reduced. A lot of potable water can be obtained.

According to the second invention, the first purification unit disposed downstream of the water intake unit and the second purification unit disposed downstream of the first purification unit are connected to the downstream side. And a drinking water system that branches from the domestic water system downstream of the second purification unit and is connected to the downstream side via the third purification unit. The part comprises a purification material that removes at least one of mold odor, calcium, impurities that clog the second purification part and / or the third purification part, and the second purification part is at least one of bacteria or protozoa And the third purifying part is provided with a purifying material having a higher salt removal rate than that of the first purifying part and the second purifying part, so that only water used for drinking can be obtained. In order to purify Can be suppressed to a main minimum, saving the running costs, it is possible to prolong the service life, it is possible to downsize the apparatus of the third purification unit.

In addition, since the drinking water supplied from the drinking water system is roughly filtered by the first purification unit and bacteria and protozoa are removed by the second purification unit before being purified by the third purification unit, The purification material in the purification unit is less likely to be clogged, extending its life, and the third purification unit can reduce the amount of concentrated water generated due to reverse osmosis, allowing more drinking water Can be obtained.

According to 3rd invention, the water receiving tank which can store water is provided in the downstream of the said 2nd purification part of the said domestic water system, The said drinking water system is connected to the said water receiving tank in the upstream. Water purification performance required for the first and second purification units can be supplied by purifying the water during a period of low usage and storing it in the water receiving tank. Can be reduced.
In addition, when potable water use equipment is used, the water stored in the water receiving tank can be purified and supplied by the third purification section, so use of potable water use equipment is relatively small. It is not necessary to operate the first purifying unit and the second purifying unit each time, and the running cost can be saved.

According to 4th invention, in the path | route of the said domestic water system and / or the said drinking water system, by providing the chlorine addition part which adds chlorine to water, a domestic water system and / or a drinking water system Bacteria can also be prevented from growing in the piping, and sanitary water can be supplied to the user.

According to 5th invention, the said water system for domestic use is connected to the 1 or more water-purifying apparatus used for purposes other than drinking water downstream, and the said drinking water system uses water for drinking 1 downstream. By being connected to the above potable water use utensils, it is possible to realize a water purifying system capable of supplying water suitable for each use of the water purifying utensils and the potable water using utensils.

According to the sixth aspect of the present invention, the water purifying device and / or the potable water using device is provided with a chlorine removing device having a purifying material for removing chlorine from the water passing therethrough, so The added chlorine can be removed immediately before use, and hygienic and safe water can be supplied to the user.

It is explanatory drawing which shows the water purification system which concerns on embodiment of this invention. It is explanatory drawing which shows the conventional water purification system.

Hereinafter, the water purification system which concerns on embodiment of this invention is demonstrated.
The water purification system is for supplying purified water to a plurality of appliances provided inside and outside of a building, a detached house, an apartment house, or the like. In the embodiment of the present invention, a case where a water purification system is provided in an apartment will be described as an example.
As shown in FIG. 1, in this water purification system, the water purification apparatus 2 is arrange | positioned at the intake of raw | natural water, such as well water in the building 1, and all the well water used in the building 1 passes the water purification apparatus 2. As shown in FIG. ing. The installation location of the water purifier 2 is not particularly limited, such as a room in the building 1, the outdoors, and the basement.
In the water purification apparatus and the water purification system of the present invention, the raw water supplied to the water purification apparatus is well water, pond water, lake water, seawater, river water, brackish water at the estuary, and the like. The water purifier and water purification system of the present invention can be effectively purified particularly when raw water containing salt is purified, for example, well water containing salt can be used as raw water to effectively purify the raw water. Is.

The water purification system and the water purification apparatus 2 have two piping systems composed of a domestic water system 3 and a drinking water system 4.
The household water system 3 supplies water to the water purification equipment 5 such as a bathroom faucet and a washing machine faucet that is used for daily life other than drinking water, and is one or more water purification equipment that is not intended for drinking. 5 is a water system for supplying water.
The drinking water system 4 supplies water to a drinking water use device 6 such as a kitchen faucet that is used for drinking water separated from the domestic water system, and is supplied to one or more drinking water use devices 6. A water system that supplies water.

The domestic water system 3 of the water purifier 2 includes, in order from the water intake side (upstream side), a first purification unit 7 that performs coarse filtration of water, suspended substances (SS), bacteria, protozoa, colloidal substances, and the like. And a second purification unit 8 for removing water from the water.
The water purified by the first purification unit 7 and the second purification unit 8 is temporarily stored in a water receiving tank 10 provided downstream, and is supplied to the water purification equipment 5 of each household 1a through the piping of the domestic water system 3. The

The water receiving tank 10 is also connected to a piping of a drinking water system 4 that branches from the domestic water system 3.
The drinking water system 4 is provided with a third purification unit 9 that removes soluble substances, viruses, salt, and other ionic substances from the water downstream of the water receiving tank 10, and is treated by the third purification unit 9. Water suitable for drinking (drinking water) is supplied to the drinking water using device 6 of each household 1a.

The 1st purification | cleaning part 7 is arrange | positioned in the most upstream side in a water purifier, and is equipped with at least 1 or more of an activated carbon filter, an ion exchange filter, a sand filter, or a nucleation unit filter as a purification material.
The activated carbon filter is made of granular activated carbon and / or fibrous activated carbon, and can remove residual chlorine, musty odor, SS, pigment, and organic matter from the passing water.
The removal of mold odor means that diosmine ((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 raw water.

An ion exchange filter such as an ion exchange resin filter can remove nitrate nitrogen, nitrite nitrogen, calcium and magnesium that cause hardness from passing water.

The sand filter is equipped with a filter having a pore size of about 10 μm, and can remove SS, sand, manganese, and pigment from the passing water.

The nucleation unit filter is made by adding a nucleating agent to water to agglomerate electrified metal ions, arsenic, fluorine, silica, chlorine, etc. into large particles (floc), and remove them by precipitation or filtration. be able to. As the nucleating agent, for example, a ferric hydroxide colloid solution can be used.
The nucleation unit filter has a nucleating agent tank, a metering pump, and a filter. The water introduced into the nucleating unit filter is administered with the nucleating agent stored in the nucleating agent tank by the metering pump, and the floc is removed by the filter.
There are two types of filters: a cross-flow system that allows water to pass in parallel to the filter surface and a dead-end system that allows water to pass perpendicular to the filter, but a cross-flow system that does not cause clogging. This is preferable because the life of the filter becomes longer and the life of the purification material of the second purification section is prolonged.

Further, the nucleation unit filter may not be provided with a filter, but flocs may be precipitated and the supernatant water may be supplied downstream, but it is desirable to provide a filter in order to reliably remove metal ions and the like.
Further, the floc may be removed by the purification material of the second purification unit without providing a filter in the nucleation unit filter. However, in order to prevent clogging of the purification material in the second purification section and extend the life, it is desirable to provide a filter in the nucleation unit filter.

Which purifying material is used for the first purifying unit 7 may be determined according to the water quality of the water source, and a plurality of these purifying materials may be used in combination.
Use of an activated carbon filter is preferable because a mold odor that is difficult to remove with a UF membrane, MF membrane of the second purification unit 8 and an RO membrane of the third purification unit 9 described later can be removed.
In addition, it is preferable to use an ion exchange filter because it can soften water by removing calcium and magnesium that are difficult to remove with a UF membrane or an MF membrane. Calcium and magnesium can be removed from the RO membrane, but it is preferable to use an ion exchange filter for the first purification unit 7 in order to reduce the burden on the RO membrane and prolong the life.
In the embodiment of the present invention, as an example of the first purification unit 7, a prefilter 11 including an activated carbon filter and an ion exchange filter, and a nucleation unit filter 12 are used.

The second purification unit 8 is provided on the downstream side of the first purification unit 7 and includes a UF membrane (ultrafiltration membrane) and / or an MF membrane (microfiltration membrane) as a purification material. As an example, the UF membrane and the MF membrane can be used in the form of a hollow fiber membrane.
In the 2nd purification | cleaning part 8, water is pressurized, a purification material is allowed to pass through, bacteria and protozoa are removed, and it supplies to a water receiving tank.

The UF membrane has a pore size of 0.001 to 0.01 μm and removes SS, pesticides, bacteria, protozoa, polymer substances, colloidal substances, etc. that could not be removed by the first purification section from the passing water. Can do.
The MF membrane has a pore size of 0.01 to 10 μm, and can remove fine particles and bacteria from the passing water.
As materials for the UF membrane and the MF membrane, polyvinylidene fluoride (PVDF), cellulose acetate (CA), polyethylene (PE), polysulfone (PS), polyethersulfone (PES), ceramics, and the like can be used.
Of the UF membrane and MF membrane, the UF membrane has a smaller pore size and can remove agrochemicals, viruses, and the like, and therefore it is particularly desirable to use the UF membrane.

Further, a chlorine addition unit 13 is provided between the second purification unit 8 and the water receiving tank 10. The chlorine addition unit 13 includes a hypochlorous acid tank (not shown) and a metering pump (not shown), and can add sodium hypochlorite to the water purified by the second purification unit 8. .
A sodium hypochlorite aqueous solution is stored in the hypochlorous acid tank, and the sodium hypochlorite aqueous solution is added to water through a metering pump and piping, so that the chlorine concentration in the water becomes 0.3 to 1 mg / l. Adjust as follows. By adding sodium hypochlorite, it is ionized 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 appliance 5 can be prevented, and the safety of purified water can be maintained until just before using the appliance 5 using the purified water.
The chlorine concentration refers to the total concentration of chlorine molecules, hypochlorous acid, and hypochlorite ions in water.

As another modified example of the chlorine addition unit 13, 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 a metering pump.
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 the amount of hypochlorous acid or hypochlorite ion in water is collectively referred to as adding chlorine.
Among these, it is more preferable to use sodium hypochlorite, which is easily available, as an aqueous solution.
In addition, the chlorine addition part 13 is not provided independently between the 2nd purification | cleaning part 8 and the water receiving tank 10, but is provided in the water receiving tank 10 integrally, for example, and adds chlorine to the water in the water receiving tank 10 It is good.

The water from which impurities have been removed by the first purification unit 7 and the second purification unit 8 and to which chlorine has been added by the chlorine addition unit 13 is temporarily stored in the water receiving tank 10 and is connected to each household 1a by the piping of the domestic water system 3. Is supplied to the water purification appliance 5.
When a water purification system is installed in a multi-family apartment, the use of water purification may be concentrated, such as using a shower in a bathroom at the same time in multiple households 1a. The ability to supply the amount of water used is required. In the embodiment of the present invention, by providing the water receiving tank 10, the water treatment performance per unit time of the first purification unit 7, the second purification unit 8 and the chlorine addition unit 13 is smaller than the peak usage. Even if it makes it, the usage-amount at the peak time can be supplied by purifying water and storing it in the water-receiving tank 10 in the time zone with little usage-amount. Therefore, the water treatment performance required for the first purification unit 7 and the second purification unit 8 can be reduced, both the initial cost and the running cost can be reduced, and the water purification device 2 can be downsized. Can do.

Further, by providing the water receiving tank 10, when the potable water using device 6 is used, the water stored in the water receiving tank 10 can be purified and supplied by the third purification unit 9. Therefore, it is not necessary to operate the first purification unit 7 and the second purification unit 8 each time the potable water use device 6 with a relatively small amount of water is used, and the running cost can be reduced.

A chlorine removal device 14 is attached to or integrated with the water purification instrument 5 of the domestic water system 3. The chlorine removal device 14 includes a purification material capable of removing at least chlorine in the purified water.
As the purification material, activated carbon, RO membrane, sterilizing ceramic, ion exchange resin filter, zeolite, calcium sulfite, and the like can be used. In order to add chlorine removal performance, at least one of activated carbon or calcium sulfite needs to be used. Since calcium sulfite dissolves in water and removes chlorine, it is preferable to use activated carbon for the water purifying apparatus 5 used for a long time. Moreover, when the purification material containing activated carbon is used, a mold odor can be further removed from water.
In addition, in order to suppress the increase in the size of the chlorine removal device 14, increase the chlorine removal capacity per unit water volume, and suppress the decrease in the chlorine removal capacity over time of use, as the purification material, short fibrous activated carbon and particulate It is preferable to use the activated carbon together.

It is preferable to remove 60% or more, further 70% or more, particularly 80% or more of chlorine in the water by the chlorine removing device 14. The concentration of residual chlorine contained in the water that has passed through the chlorine removing device 14 is preferably 0.2 mg / l or less, more preferably 0.1 mg / l or less, and particularly preferably 0.05 mg / l or less. The chlorine concentration in water 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 chlorine removing apparatus. The chlorine removing device 14 may be integrated with the faucet (water purification device 5) or externally attached as described above. However, in order to reduce the installation space, the chlorine removing device 14 may be integrated. It is preferable to use it.
In the water purification system of the present invention, since impurities have been removed in advance in the water purification apparatus 2, the chlorine removal apparatus 14 only needs to remove chlorine from the supplied water at a minimum. Therefore, by using a device integrated with a faucet or the like (water purification equipment) as the chlorine removal device 14, the hygiene of the entire water purification system, space saving of the chlorine removal device, the cost of the entire water purification system and / or the chlorine removal device. Both reductions can be achieved.

In the water purification system of the present invention, since the purified water already purified by the water purification device 2 is supplied to the chlorine removal device 14, the chlorine removal device only needs to be able to remove chlorine at a minimum, and the purification capability required for the chlorine removal device 14 is achieved. It can be relatively small.
Moreover, it is not necessary to provide a chlorine removal apparatus in all the water purification use apparatuses 5, and it is not necessary to provide a chlorine removal apparatus in some water purification use apparatuses 5. FIG. Further, as in the shower head described in Japanese Patent No. 3799007, a flow for switching between a flow path for removing the chlorine by passing the purifying material and a flow path for discharging without passing through the purifying material for all the purified water supplied. A path switching valve may be provided in the water purifying apparatus 5.

The drinking water system 4 branches from the domestic water system 3 in the water receiving tank 10, removes salt and the like from the water in the third purification unit 9, and supplies the drinking water using device 6 of each household 1a.
The third purification unit 9 is provided in the drinking water system 4 and includes an RO membrane (reverse osmosis membrane) and / or an NF membrane (nanofiltration membrane) as a purification material.
The 3rd purification part 9 pressurizes the water of the upstream of a purification material with a pump (not shown), passes a purification material, obtains the drinking water from which salt content was removed, and supplies it to the downstream drinking water use instrument 6 To do.

The RO membrane can remove soluble substances, viruses, salt and other ionic substances from the water passing therethrough.
As a material for the RO membrane, synthetic resins such as cellulose acetate, cellulose-based polymer, polyamide-based, and vinyl polymer can be used, but polyamide-based nylon is preferably used from the viewpoint of durability.

The NF membrane is a reverse osmosis membrane having a pore diameter of about 1 to 2 nm, and can remove calcium, magnesium, humic substances, trihalomethane, heavy metal ions, and the like that cause hardness from the passing water. The salt removal rate in the NF membrane is generally about 60%.
As the material of the NF film, polyamide-based, polypiperazine amide-based, polyester amide-based, water-soluble vinyl polymer and the like can be used.

The RO membrane and NF membrane have a smaller pore size, and the removal rate of trihalomethane such as chloroform and bromoform generated by combining ionic substances such as salt and chlorine with organic substances in water is high. It is desirable to use an RO membrane in order to improve safety.
On the other hand, the RO membrane has a small pore diameter, and the required pressure for passing water is higher than that of the NF membrane, so that the required performance and power consumption of the pump are increased. Therefore, it is preferable to use an NF film in order to reduce running costs.
In the embodiment of the present invention, an RO membrane is used to increase the safety of drinking water.

If the third purification unit 9 continues to purify the water, the concentration of the salinity and the like of the water upstream of the purification material increases, so this concentrated water needs to be drained at regular intervals. Therefore, on the upstream side of the purification material of the third purification unit 9, a drain pipe 15 for connecting and draining concentrated water is connected, and a dilution water pipe 16 that joins the drain pipe 15 from the water receiving tank 10 is provided. The concentrated water can be diluted and discarded with water supplied from the water receiving tank 10.
The drain pipe 15 and the dilution water pipe 16 are provided with an opening / closing valve (not shown) or the like so that the opening / closing can be controlled.
In the present invention, for example, when a UF membrane is used for the second purification unit 8 and an RO membrane is used for the third purification unit 9, the water supplied to the third purification unit 9 is the UF membrane of the second purification unit 8. Since impurities are removed in advance, about 90% of the water supplied to the third purification unit 9 can be filtered to make drinking water, and the amount of concentrated water can be suppressed to about 10%. . In addition, when the 2nd purification | cleaning part 8 is not provided in the upstream of the RO membrane, only about 50% of the water supplied to the 3rd purification | cleaning part 9 can be made into drinking water.

In the third purification unit 9, chlorine in the water is removed in the same manner as salt and other ionic substances, so a chlorine addition unit 17 is provided downstream of the third purification unit 9.
The chlorine addition unit 17 is the same as the chlorine addition unit 13 provided upstream of the water receiving tank 10, and includes a hypochlorous acid tank and a metering pump. The chlorine addition unit 17 supplies hypochlorite to drinking water purified by the third purification unit 9. Sodium chlorate can be added. In this chlorine addition part 17, it adjusts so that the chlorine concentration in water may be 0.3-1 mg / l.

The chlorine removing device 18 is also attached to or provided integrally with the potable water use device 6 of the potable water system 4. The chlorine removing device 18 can be the same as the chlorine removing device 14 provided in the water purifying apparatus 5 and includes a purification material capable of removing at least chlorine in drinking water, and chlorine from drinking water. Can be removed and supplied.

In the water purifier 2 and the water purification system of the present invention, the water that has been roughly filtered by the first purification unit 7 and from which bacteria and protozoa have been removed by the second purification unit 8 is supplied to the third purification unit 9. By removing at least salt from the RO membrane and / or the NF membrane to obtain drinking water, the water purified by the first purification unit 7 and the second purification unit 8 is supplied to the third purification unit 9 The RO membrane and / or NF membrane can be made less clogged and the life can be prolonged. Moreover, since the water filtered by the 1st purification | cleaning part 7 and the 2nd purification | cleaning part 8 is supplied to the 3rd purification | cleaning part 9, the discard amount of the concentrated water generated by reverse osmosis in the 3rd purification | cleaning part 9 is reduced. And more drinking water can be obtained.

Furthermore, after the water used for purposes other than drinking is purified by the first purification unit 7 and the second purification unit 8, the life is supplied to the water purification equipment 5 of each household 1 a without going through the third purification unit 9. By having the irrigation system 3, the third purification unit 9 processes only water used for drinking, and therefore the amount of RO membranes and / or NF membranes that are expensive and high in running costs can be reduced. The life of the RO membrane and / or the NF membrane can be prolonged, and the device of the third purification unit 9 can be miniaturized.
In addition, water used for purposes other than drinking is also used in a bathroom or a washing machine because heavy metals are removed by the first purification unit 7 and the second purification unit 8 to be softened and supplied to the water purification device 5. However, it does not cause problems such as poor foaming or adverse effects on the body. In addition, since harmful substances, bacteria and protozoa are removed by the first purification unit 7 and the second purification unit 8 and supplied to water-purifying equipment, sanitary problems also occur when used in bathrooms and washing machines. It does not occur.

Further, in the domestic water system 3 and / or the drinking water system 4, the provision of the

chlorine addition sections

13 and 17 for adding chlorine to the water allows the domestic water to be used due to the sterilizing power of hypochlorous acid and hypochlorite ions. Bacteria can be prevented from breeding in the pipes of the system 3 and / or the drinking water system 4, and sanitary water can be used in the water purification device 5 and / or the drinking water device 6.
In addition, when both the above-mentioned chlorine addition part 13 and the chlorine addition part 17 are provided, chlorine is added only by at least one of both chlorine addition parts, or chlorine is added by both, and water for domestic use The amount of chlorine added to the system 3 and the drinking water system 4 is different between the two systems, or chlorine is added only to the drinking water system 4 to reduce the total amount of added chlorine, and the water purifier of the present invention and It is possible to reduce the running cost for use in the water purification system. Moreover, by providing only the chlorine addition part 17 and adding chlorine only to the water of the drinking water system | strain 4, the cost of the water purifier of this invention and a water purifier system can be reduced, or use of the water purifier of this invention and a water purifier system It is possible to reduce the running cost.

Furthermore, by adding the

chlorine removing devices

14 and 18 equipped with the purifying material for removing chlorine from the water to the water purifying device 5 and / or the potable water using device 6, the water was added to the water by the

chlorine adding units

13 and 17. Chlorine is removed by the

chlorine removing devices

14 and 18, and hygienic and safe water can be used.
In addition, by providing the chlorine removing device 18 equipped with a purifying material for removing chlorine from water only in the drinking water using device 6, chlorine is removed by the drinking water using device 6 provided in the drinking water system 4 where chlorine removal is particularly desired. It can be removed and the cost of the water purification system of the present invention can be reduced. In addition, it is preferable to provide a chlorine removing device 18 equipped with a purification material that removes chlorine from water in all of the drinking water using devices 6, but in light of usage conditions such as the usage frequency of the user, some drinking water You may provide the chlorine removal apparatus 18 equipped with the purification material which removes chlorine from water only in the use instrument 6. FIG.
In addition, also when providing the chlorine removal apparatus 18 equipped with the purification material which removes chlorine from water in the purified water use apparatus 5, it adapts to the use condition, such as a user's use frequency, and the purpose of use of water, and some purified water You may provide the chlorine removal apparatus 18 equipped with the purification material which removes chlorine from water only in the use instrument 5. FIG.

The water purification system of the present invention is applied to apartment buildings such as condominiums, apartments, and buildings, intakes that collect well water into a plurality of detached houses, and one or more detached buildings and / or one or more assembled buildings. Can do. In addition, the detached house includes not only a residential detached house but also an office detached house.
Furthermore, when there is much usage-amount of purified water, you may employ | adopt the purified water system which arranged the some purified water apparatus 2 in parallel.

Moreover, in embodiment of this invention, although the

chlorine addition parts

13 and 17 and the

chlorine removal apparatuses

14 and 18 were provided in both the domestic water system 3 and the drinking water system 4, in order to reduce initial cost and running cost, The domestic water system 3 may not be provided with the chlorine addition section and the chlorine removal section, and the chlorine addition section 17 and the chlorine removal device 18 may be provided only in the drinking water system 4 that uses water for drinking.
It is preferable that the

chlorine addition units

13 and 17 use a switchable state between the state in which the sodium hypochlorite solution is added and the state in which the sodium hypochlorite solution is not added, and further, the supply amount of the sodium hypochlorite solution is controlled. It is more preferable to use one that can adjust the chlorine concentration of water.

DESCRIPTION OF SYMBOLS 1 Building 1a Household 2 Water purifier 3 Water system for domestic use 4 Drinking water system 5 Water purification equipment 6 Drinking water equipment 7 First purification section 8 Second purification section 9 Third purification section 10 Water tank 11 Prefilter 12 Nucleation unit filtration 13 Chlorine addition unit 14 Chlorine removal device 15 Drain pipe 16 Dilution water pipe 17 Chlorine addition unit 18 Chlorine removal device

Claims

A water purifier arranged at the inlet of raw water sourced from well water or the like to one or a plurality of buildings, purifies the introduced raw water and supplies it to a plurality of water use devices,
A first purification section disposed downstream of the water intake section;
Via the second purification unit arranged downstream of this first purification unit,
While having a domestic water system connected to the downstream side,
A drinking water system that branches off from the domestic water system downstream of the second purification unit and is connected to the downstream side via the third purification unit;
The first purification unit comprises at least one of activated carbon, an ion exchange filter, a sand filter, and a nucleation unit filter,
The second purification unit includes a UF membrane and / or an MF membrane,
The water purification apparatus, wherein the third purification unit includes an RO membrane and / or an NF membrane.
A water purifier arranged at the inlet of raw water sourced from well water or the like to one or a plurality of buildings, purifies the introduced raw water and supplies it to a plurality of water use devices,
A first purification section disposed downstream of the water intake section;
Via the second purification unit arranged downstream of this first purification unit,
While having a domestic water system connected to the downstream side,
A drinking water system that branches off from the domestic water system downstream of the second purification unit and is connected to the downstream side via the third purification unit;
The first purification unit comprises a purification material that removes at least one of the mold odor, calcium, impurities that clog the second purification unit and / or the third purification unit,
The second purification unit includes a purification material that removes at least one of bacteria and protozoa,
The water purification apparatus, wherein the third purification unit includes a purification material having a higher salt removal rate than the purification materials of the first purification unit and the second purification unit.
A water receiving tank capable of storing water is provided downstream of the second purification unit of the domestic water system,
The water purifier according to claim 1 or 2, wherein the potable water system is connected to the water receiving tank on the upstream side.
The water purifier according to any one of claims 1 to 3, wherein a chlorine addition unit for adding chlorine to water is provided in a path of the domestic water system and / or the potable water system.
While having the water purifier according to any one of claims 1 to 4,
The domestic water system is connected to one or more water purification equipment used for purposes other than drinking water downstream,
The drinking water system is connected to one or more drinking water use devices that use water for drinking on the downstream side.
While having the water purifier described in claim 4,
The domestic water system is connected to one or more water purification equipment used for purposes other than drinking water downstream,
The drinking water system is connected to one or more drinking water use devices that use water for drinking on the downstream side,
The water purifying system according to claim 5, wherein the water purifying device and / or the potable water using device includes a chlorine removing device having a purifying material for removing chlorine from water passing therethrough.