JP4797490B2 - Tap water treatment equipment - Google Patents

Description

  The present invention can provide safe and delicious drinking water by treating tap water with a nanofiltration (NF) membrane module and / or a reverse osmosis (RO) membrane. It is related with the tap water treatment apparatus which prevents bacterial propagation in an apparatus by adding.

  Conventionally, a water purifier using a reverse osmosis membrane has been provided in order to remove impurities and microorganisms contained in tap water and obtain clean water.

  In a water purifier using a reverse osmosis membrane, for example, as shown in Patent Document 1, a built-in (undersink) type installed under the kitchen or the like is the mainstream, and in the order of prefiltration, activated carbon treatment, and reverse osmosis membrane treatment. The purified water obtained after purification was once stored in a water storage tank, and further treated with activated carbon as a post-treatment before being supplied as drinking water. That is, as shown in FIG. 3, the tap water supplied from the tap water line 1 is previously removed from the turbid components by the spool filter 100, and residual chlorine, organic matter, etc. are removed or adsorbed by the pretreatment activated carbon filter 110. Later, the water is passed through the reverse osmosis membrane module 120 and separated into concentrated water and permeated water, the concentrated water is discharged from the apparatus through the concentrated water line 121, and the permeated water passes through the permeated water line 122 to the water storage tank. 130 was temporarily stored. Thereafter, the permeated water was removed from the faucet 150 through the water purification line 141 after the odor and the like were removed through the permeated water treatment adsorbent filter 140 containing activated carbon.

  However, in this water purifier, since the purified water is stored in the water storage tank 130 and used as necessary, the odor of the water storage tank may come into the purified water, and in order to remove this odor, Activated carbon treatment as a treatment is indispensable.

  Moreover, in this water purifier, since the residual chlorine in tap water is previously removed by the activated carbon treatment with the pretreatment activated carbon filter 110 installed on the upstream side of the reverse osmosis membrane, the purified water downstream from the pretreatment activated carbon filter 110. Bacteria may propagate inside the vessel. In order to suppress the growth of bacteria, for example, as described in Patent Document 2, a water purifier using a chlorine-resistant reverse osmosis membrane has also been proposed. However, in the water purifier described in this document, the residual chlorine in the tap water is left inside the water purifier to suppress the growth of bacteria. Water containing chlorine will be supplied.

  Moreover, in patent document 3, the filter which consists of a silver impregnated activated carbon and a hollow fiber membrane is provided in the permeated water side, and the sterilization of the permeated water line and the permeated water tank is implement | achieved. However, as in Patent Document 1, there still remains a possibility that bacteria may propagate inside the water purifier downstream of the pretreatment activated carbon filter. And since all of the water purifiers of Patent Documents 1 to 3 drain concentrated water, about half of the supplied tap water is drained, and water resources are not effectively used.

  In Patent Document 4, a line is provided in which the membrane-separated concentrated water is sterilized by another silver impregnated activated carbon and then returned to the raw water tank. Unlike Patent Documents 1 to 3 in that the concentrated water is reused, a sterilization tower is provided in a line for returning the concentrated water to the raw water tank. In addition, a separate sterilization tower is provided as an antibacterial after removing residual chlorine in tap water, and since two convenient sterilization towers are provided, the amount of silver-impregnated activated carbon used for the sterilization means increases. Cause.

Moreover, in patent document 5, the reverse osmosis membrane which employ | adopted the whole amount filtration system different from patent documents 1-4 is used. Although it is possible to save resources by not discharging concentrated water, there is no idea about antibacterial measures on the permeate side, and there is concern about bacterial growth on the permeate side.
JP 2003-225661 A JP-A-10-180253 JP 2000-288539 A JP-A 61-54278 Japanese Patent Laid-Open No. 9-19585

  The present invention removes dissolved substances, turbidity, microorganisms, etc. in tap water, removes the smell of lime, prevents bacterial growth inside the water purifier, and does not allow bacteria to flow out into the water. Is intended to provide. Furthermore, by reusing concentrated water, the amount of water resources and antibacterial means used can be minimized, and the purpose is to reduce water production costs.

The present invention for solving the above-mentioned problems is characterized by the following (1) to ( 4 ).

(1) At least a tap water line to which tap water is supplied, pretreatment means having antibacterial ion addition means for adding antibacterial ions to tap water, and pretreated water pretreated by the pretreatment means The pretreated water line, the pressurizing means for feeding the pretreated water arranged in the pretreated water line under pressure, and the pretreated water fed by the pressurized means with the permeated water. A nanofiltration (NF) membrane module and / or a reverse osmosis (RO) membrane module that separates into a concentrated water, a permeate line provided on the permeate side of the NF membrane module and / or the RO membrane module, and A tap water treatment apparatus provided with a concentrated water line provided on the concentrated water side, wherein the pretreatment means includes a filter for removing foreign substances in tap water, a filter medium layer for removing residual chlorine, and the antibacterial ions. Attendant Provided with means, in the form contained in a single cartridge, the water tap water treatment device has one end connected to any portion of the concentrated water line, the other end of said pre-treated water line includes a bypass line connected to one of the locations between the pre-processing means and said pressurizing means, said bypass line, as well and a flow regulating valve and check valve, said bypass line The amount of concentrated water to be sent is 10% to 70% of the amount of pretreated water .

( 2 ) The tap water treatment apparatus, wherein the antibacterial ion addition means is configured to add antibacterial ions to tap water that has passed through the filter.

( 3 ) The tap water treatment apparatus, wherein the antibacterial ions are silver ions or copper ions.

( 4 ) The tap water treatment apparatus, further comprising antibacterial ion adding means for adding antibacterial ions to any part of the permeate line.

  According to the present invention, dissolved substances, turbidity, microorganisms, and the like in tap water are removed, and the odor is removed. Further, bacterial propagation inside the water purifier is prevented, and bacteria are not discharged into the purified water, which is highly safe. A water purifier can be provided. Furthermore, antibacterial ions added to tap water can be reused by using a bypass line inside the device, and long life and cost reduction can be realized by using antibacterial ion addition means for a long period of time. It is.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the form shown below at all.

  FIG. 1 is a flow diagram of a tap water treatment apparatus showing an embodiment of the present invention. When the tap water is supplied to the tap water line 1, first, in the pretreatment means 10, foreign substances in the tap water are removed by the filter 11, and then residual chlorine is removed by the filter medium layer 12. Further, antibacterial ions eluted from the antibacterial ion adding means 13 are added to the tap water. Here, there is no particular limitation on the arrangement of the filter 11, the filter medium layer 12, and the antibacterial ion addition means 13 provided as the pretreatment means 10, but if the foreign matter in tap water is removed first, the filter medium layer 12 Since it can prevent clogging and early decline in adsorption capacity, the filter 11 is arranged on the upstream side of the filter medium layer 12 and the antibacterial ion adding means 13, and antibacterial ions are added to the tap water that has passed through the filter 11. It is preferable to do.

  The pretreated water treated in this manner is mixed with concentrated water flowing in from a bypass line 40 to be described later, and after the water pressure is raised by the pressurizing means 80, the NF membrane module and / or the RO membrane module 20 To be passed through. In the NF membrane module and / or the RO membrane module 20, the pretreated water is separated into permeated water and concentrated water. The separation ratio between the permeated water and the concentrated water is adjusted by a concentrated water adjusting valve 70 attached to the concentrated water drain pipe. Concentrated water is drained as it is, or part of it is mixed with pretreated water through the bypass line 40 and reused. The bypass line 40 is provided with a flow rate adjusting valve 50 for adjusting the flow rate and a backflow prevention valve 60 for preventing the pretreated water from flowing back.

  Next, each component will be described.

  As described above, the pretreatment means 10 has the filter 11 for removing foreign substances in tap water, the filter medium layer 12 for removing residual chlorine, and the antibacterial ion addition means 13, which are housed in one cartridge. It is preferable in the point that it is easy to handle. FIG. 2 shows an embodiment of the configuration of the preprocessing means 10. Inside the vertically long cartridge, a layer in which the hollow cylindrical filter 11, the filter medium layer 12, and the antibacterial ion adding means 13 are mixed is sequentially arranged in the axial direction from the upstream side where tap water flows. The shape and size of the cartridge are not particularly limited. However, when the shape is compatible with a commercially available cartridge housing, it is preferable in terms of easy replacement and the availability of piping members at low cost. As a preferable shape and size, a cylindrical shape having a diameter of 5 to 10 cm and a length of 10 to 50 cm is preferable because it is easy to handle. Particularly preferable shapes and sizes include a cylindrical shape having a diameter of about 3 to 10 cm and a length of about 10 to 50 cm, which is the same size as a commercially available cartridge housing.

  The filter 11 is required to remove foreign substances in tap water and suppress pressure loss during water flow as much as possible. As a raw material, what wound PP (polypropylene) fiber, the thing which laminated | stacked multiple PP fiber sheets, and the thing which carried out the pleat processing are used preferably, However, It is not limited to these. Further, although the filter shape is not limited, it is particularly preferable to use a hollow cylindrical shape as shown in FIG. 2 because it is compact and can be treated reliably without a shortcut.

  The filter medium layer 12 removes residual chlorine in tap water, and activated carbon, calcium bicarbonate, or the like is used. In particular, activated carbon that is safe, inexpensive, and easy to process is preferably used. Activated carbon has shapes such as granular, fibrous, and powder, but considering the point of suppressing pressure loss during water flow as much as possible, a granular material having a large particle size or a molded body obtained by molding fibrous activated carbon with a binder or the like is preferable. Since the NF membrane module and / or the RO membrane module 20 disposed in the subsequent stage is liable to be destroyed by residual chlorine, the NF membrane module and / or the RO in order to maintain a predetermined removal performance for a long period of time. It is necessary to remove residual chlorine reliably in front of the membrane module 20. When activated carbon is used for the filter medium layer 12, it is preferable not only in removing residual chlorine but also in removing harmful organic substances such as trihalomethane present in a trace amount in tap water.

  The antibacterial ion addition means 13 is a member that elutes silver ions or copper ions having antibacterial ability into tap water, and carries a silver compound or a copper compound on the surface of the base material or inside thereof and makes contact with tap water when water is passed. Thus, silver ions and copper ions are released into tap water using solubility. The antibacterial ion addition means 13 is disposed at this position because, as a result of removing residual chlorine in the tap water by the filter medium layer 12, bacteria propagate in the tap water downstream from the filter medium layer 12, and the filter medium layer 12 and the NF membrane. This is because the module and / or the RO membrane module 20 may be clogged early, or the removal performance of the NF membrane module and / or the RO membrane module 20 may be deteriorated. In order to prevent such a state, when the antibacterial ion addition means 13 having a new antibacterial ability is disposed, the bacteria are not propagated in the filter medium layer 12, the NF membrane module and / or the RO membrane module 20, and stable for a long time. Can drive.

  Such a silver compound or copper compound is not particularly limited, but if it is a compound containing a base of any one of a halide salt, nitrate salt, sulfate salt, phosphate salt, sulfide salt, and oxide salt, a silver ion or copper having a concentration described later. Easily elutes ions. Moreover, as a base material, it is preferable to use the ceramic and granular activated carbon which are easy to carry | support a silver compound and a copper compound. In ceramics, zeolite having an ion exchange function, calcium phosphate represented by hydroxyapatite, and the like are preferably used from the viewpoint of safety. In addition, when granular activated carbon is used as a base material, the activated carbon used in the filter medium layer 12 can be used as it is, so that the amount of activated carbon charged in the cartridge can be increased. It is a particularly preferable form in that it is possible to provide a cartridge capable of continuing the release of copper ions and copper ions for a long period of time, so that the user does not need to change frequently.

  The antibacterial ion concentration eluted from the antibacterial ion adding means 13 is designed to be a concentration capable of suppressing the growth of bacteria within a range determined by the tap water quality standard. For example, silver ion is known to have an antibacterial effect against green-contaminated bacteria, alkaligenes, and Escherichia coli as long as it is set to 100 ppb or less according to EPA (American Environmental Protection Agency) standards and 10 ppb or more. From this knowledge, it is preferable to fill the antibacterial ions so that the silver ion concentration is in the range of 10 to 100 ppb, more preferably in the range of 10 to 50 ppb. In addition, as means for controlling the silver ion concentration within such a range, it is necessary to appropriately adjust the water flow rate, the size of the base material, and the amount of silver compound supported. In general, the higher the water flow rate, the shorter the contact time with the silver compound, so the silver ion concentration tends to be lower. Further, when the base material is made smaller, the contact area increases, so that the silver ion concentration tends to increase. The water flow rate is preferably 5 L / min or less, the size of the base material is 0.15 mm (100 mesh) or less, and the proportion of silver in the compound is preferably in the range of 0.05 to 3% by weight. As an example, the surface of a 0.25-0.5 mm (32-60 mesh) coconut shell granular activated carbon was supported with a silver compound centered on 0.5-1.0% by weight of silver chloride on the surface. A mode in which a cartridge packed with silver-impregnated activated carbon is preferably used at a water flow rate of 1.5 to 2.5 L / min.

  Next, the NF membrane module and / or the RO membrane module 20 will be described. The NF membrane and the RO membrane are membranes that can selectively remove organic ions in tap water as well as inorganic ions having a small molecular weight. Although the removal mechanism is not clear, it does not pass through physical pores, but the removal performance varies depending on the charge state and concentration gradient between the membrane surface and ions. In general, the selective permeability of the NF membrane is such that the removal performance of monovalent ions is low, the removal rate is about 30 to 80%, the divalent or higher ions have a removal rate of 90% or more, and the RO membrane has some ions. In general, the removal rate is 95% or more. By using such an NF membrane and / or RO membrane, not only harmful organic substances but also harmful inorganic ions such as heavy metal ions can be removed. Further, unlike the adsorbent, the NF membrane and / or the RO membrane can be operated for a long period of time with a substantially constant removal performance unless the membrane is deteriorated or clogged.

  The NF membrane module and / or the RO membrane module 20 uses a plurality of selectively permeable NF membranes and / or RO membranes, and modules having various shapes have been proposed. Among these, it is preferable to use one or more spiral elements formed by winding a plurality of NF membranes and / or RO membranes around a water collecting pipe. In the present invention, the shape of the NF membrane module and / or the RO membrane module is not limited in any way, but the NF membrane module and / or the RO using one to several spiral elements having a diameter of about 5 cm and a length of about 30 cm. The use of a membrane module is particularly preferable because it can be manufactured at low cost and the piping member can be easily obtained.

  The material of the NF membrane and / or RO membrane is not particularly limited, and a polyamide (PA) membrane or a cellulose acetate (CA) membrane can be used, but high removal performance is obtained and stable over a wide range of pH. It is preferable to use a polyamide-based film that can exhibit the removed performance. In addition, although NF membranes and / or RO membranes having various performances according to the operating water pressure and the concentration of water to be treated have been proposed, in the present invention, generally about 0.2 to 0.5 MPa. It is desirable to select an NF membrane and / or an RO membrane having a membrane separation capability that can provide a sufficient amount of permeated water at a tap water pressure and a sufficient water quality. Since the target tap water quality varies depending on the location and region, it is difficult to specify the selective permeation performance uniformly, but the removal rate calculated from the evaporation residue concentration is desirably 50% or more. As an example, in the case of an RO membrane, if the removal rate is approximately 95% or more excluding some ions, and in the case of an NF membrane, if the removal rate of monovalent ions with low removal performance is 50% or more, It is preferable in that harmful substances can be almost removed.

  Furthermore, when an NF membrane and an RO membrane are used in combination, membrane separation can be performed in multiple stages, so that a larger amount of permeated water can be obtained. However, if the amount of permeated water is too large, the concentration of residual ions in the concentrated water increases, and some ions may be deposited beyond the solubility. In this case, if an NF membrane is arranged on the upstream side and an RO membrane is arranged on the downstream side, the removal rate of monovalent ions in the NF membrane is lower than that on the RO membrane. Therefore, the treated water supplied to the RO membrane arranged on the downstream side Since the monovalent ion concentration can be kept low, the possibility of precipitation exceeding the solubility when the membrane is separated by the RO membrane is reduced. Thus, the combined use of the NF membrane and the RO membrane is preferable in that a larger amount of water can be obtained, and ions can be appropriately removed to stably operate.

  Moreover, separation into permeated water and concentrated water in the NF membrane module and / or the RO membrane module 20 can be realized by closing the flow rate adjusting valve 70 provided in the concentrated water line 22 and increasing the incoming tap water pressure. The ratio of the permeated water and the concentrated water is not particularly limited. However, if the concentrated water is decreased, a specific dissolved substance has a concentration higher than the solubility and may be precipitated. Therefore, the permeated water: the concentrated water = 8: Preferably, 2 is the upper limit. On the contrary, if permeated water: concentrated water = 3: 7 or less, the amount of permeated water used as drinking water becomes extremely small, and the user easily feels dissatisfied.

  The antibacterial ion adding means 30 adds silver ions or copper ions to the permeated water flowing in the permeated water line 21, and the same member as the antibacterial ion adding means 13 can be used as a constituent member. When pretreatment water to which silver ions or copper ions are added is separated by the NF membrane module and / or RO membrane module 20 described above, most of the silver ions or copper ions flow to the concentrated water side. However, when the permeated water is discharged as drinking water from a faucet (not shown) or the like at the end, bacteria attached to the air or the user's hand may enter the pipe. Here, if sufficient silver ions or copper ions are not present in the permeate, bacteria may grow in the pipe. In order to prevent this growth, the antibacterial ion addition means 30 allows silver ions or copper ions to be added to the permeated water so as to be at least 10 ppb or more. If the antibacterial ion concentration is 10 ppb or more, the growth of most bacteria can be suppressed. As a means for controlling the antibacterial ion concentration as described above, it is necessary to appropriately adjust the water flow rate, the size of the base material, and the amount of the silver compound supported as described in the antibacterial ion addition means 13. The water flow rate is preferably 5 L / min or less, the size of the base material is 0.15 mm (100 mesh) or less, and the proportion of silver in the compound is preferably in the range of 0.05 to 3% by weight. As an example, a silver compound mainly composed of 0.5 to 1.0% by weight of silver chloride is supported on the surface of a granular activated carbon made of coconut shell of 0.35 to 0.7 mm (24 to 42 mesh). An embodiment in which the silver-impregnated activated carbon is passed at a water flow rate of 0.8 to 1.0 L / min can be preferably used.

  The bypass line 40 has one end connected to any part of the concentrated water line and the other end of the pretreated water 15 in order to effectively recycle silver ions or copper ions, most of which remain in the concentrated water. It is provided so that it may be connected to any part of the line upstream of the pressurizing means 80 in the water flow line. The ratio of sending the concentrated water to the bypass line 40 is preferably at least 10% of the amount of pretreated water. More preferably, it is 20% or more. When the amount of water to be bypassed increases, most of the silver ions or copper ions discharged without being removed by the NF membrane module and / or the RO membrane module 20 can be reused, so that the amount of the antibacterial ion addition means 13 can be reduced. . Alternatively, when the same amount of antibacterial ions is added, silver ions or copper ions can be released over a longer period. Furthermore, since the speed of passing through the NF membrane module and / or the RO membrane module 20 is increased as compared with the case where no bypass is performed, the quality of the permeated water is improved from the characteristics of the NF membrane module and / or the RO membrane module. It can be expected that the exchange frequency of the NF membrane module and / or the RO membrane module is reduced because foreign matters are not easily clogged inside the membrane module and / or the RO membrane module. The flow rate of the bypass line 40 is adjusted by the flow rate adjusting valve 50. In addition, when mixing the pretreated water and the concentrated water in the pretreated water line 15, in order to prevent the pretreated water from flowing into the bypass line 40, a backflow prevention valve 60 is attached to ensure one-way. Commercially available products can be used as they are for the flow rate adjustment valve 50 and the backflow prevention valve 60.

  The pressurizing means 80 is provided at any location of the pretreatment water line 15 between the connection portion with the bypass line 40 provided on the downstream side of the pretreatment means 10 and the NF membrane module and / or the RO membrane module 20. It is installed and used by raising the water pressure necessary for the membrane separation of the NF membrane module and / or the RO membrane module 20. The pressurizing means 80 is not particularly limited in the present invention, and can be appropriately selected according to the amount of water and the water pressure.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

<Example 1>
A tap water treatment apparatus constituted by the flow of FIG. 1 was produced. The pretreatment means 10 has a filter 11 made of PP (polypropylene) having a diameter of 5 cm and a length of 12.5 cm in order from the upstream side of the tap water inlet, and a filter medium layer 12 in a diameter of 6.5 cm and a length of 25 cm. The remaining space was filled with 400 ml of coconut shell activated carbon having a particle size distribution of 30 to 60 mesh. The coconut shell activated carbon surface was impregnated with 0.7% by weight of a silver compound so that it could be used as the antibacterial ion addition means 13. As the NF membrane module and / or the RO membrane module 20, an NF membrane UTC-60 manufactured by Toray Industries, Inc. was used, and one element having a diameter of 5 cm and a length of 30 cm was filled in the module. The antibacterial ion adding means 30 is processed into a hollow cylindrical shape product made from Sinanen Zemic Co., Ltd., Sinanen Zeomic Co., Ltd., fibrous activated carbon, and a binder, and filled into a cartridge. did. The pressurizing means 80 was equipped with a small booster pump.

  When tap water with a water temperature of 20 ° C., tap water pressure of 0.15 MPa, and a flow rate of 2 L / min was boosted to 0.5 MPa with a booster pump 80, the permeated water was 0.8 L / min, and the concentrated water was It became 1.2 L / min. Next, when the flow rate adjustment valve 50 was opened and 0.5 L / min flowed to the bypass line 40, the permeated water rose to 1.0 L / min. In this state, water was passed for 5 hours per day, and the other cycle was repeated for 10 days.

  Table 1 shows changes in the silver ion content of permeated water and concentrated water for 10 days. Further, the number of general bacteria in the permeated water after passing through the antibacterial ion adding means 30 immediately after the start of operation was counted every day. The results are also shown in Table 1. The silver ion concentration was measured using an ICP (inductively coupled plasma emission spectrometer). The number of general bacteria was counted according to the method defined in the tap water quality standard, that is, the number of all bacteria forming colonies in the medium when cultured at 36 ± 1 ° C. for 24 ± 2 hours using a standard agar medium.

  From the results in Table 1, it was confirmed that even after 10 days of operation, silver ions of 10 ppb or more existed in both concentrated water and permeated water, and safe drinking water in which general bacteria did not grow was provided.

<Comparative Example 1>
A tap water treatment apparatus constituted by the flow shown in FIG. 3 was produced. The thread-wound filter 100 was loaded in a cartridge (diameter 6.5 cm × 25 cm) made of PP and using one 5 cm diameter × 25 cm length and nominal removal performance of 5 μm. In the pretreatment activated carbon filter 110, 800 ml of the same coconut shell activated carbon as in Example 1 was filled in the same cartridge as the spool filter 100. This activated carbon is not impregnated with a silver compound. As the reverse osmosis membrane 120, UTC-70 manufactured by Toray Industries, Inc. was used, and the module assembly method was the same as in Example 1. The water storage tank 130 can store 10 L of permeated water 122 and has a structure in which water is stored in a balloon-like rubber bag provided inside an iron tank. The rubber bag is used for discharging the permeated water stored using the force that the rubber bag shrinks when the faucet is opened. As the permeated water treatment adsorbent filter 140, a cartridge having the same configuration as that of the pretreatment activated carbon filter 110 was used.

  Tap water having a water temperature of 20 ° C. and a tap water pressure of 0.15 MPa was supplied to the apparatus. When tap water pressurized to 0.7 MPa with a booster pump was passed at a flow rate of 2 L / min, the permeated water 21 was 0.4 L / min and the concentrated water 22 was 1.6 L / min.

  The operation was performed for 10 days under the same operation conditions as in Example 1. Since the water storage tank becomes full during operation, it was decided to keep the faucet open and allow permeate to flow. The faucet was closed during times when operation was not performed. Since Comparative Example 1 does not use activated carbon impregnated with a silver compound, only the results for the number of general bacteria are shown in Table 1. In the absence of silver ions, general bacteria proliferated as the number of days passed, exceeding the tap water quality standard of 100 cells / ml after the fifth day, making it unsuitable for drinking water.

<Comparative example 2>
In the tap water treatment apparatus constituted by the flow of FIG. 1 shown in Example 1, the pretreatment means 10 was filled with coconut shell activated carbon not attached with a silver compound, and the antibacterial ion addition means 30 was removed. The operation was performed for 10 days with the same configuration and operating conditions as in Example 1. Table 1 shows the operation results.

  As the operating days passed, the silver ion content in the concentrated water decreased significantly. In addition, since silver ions hardly pass into the permeated water, it was found that the number of general bacteria in the permeated water was also detected.

It is the schematic of the tap water treatment apparatus which shows one Embodiment of this invention. It is a longitudinal cross-sectional view of the pre-processing means in this invention. It is the schematic of the tap water processing apparatus by a prior art.

Explanation of symbols

1: Tap water line 10: Pretreatment means 11: Filter 12: Filter medium layer 13: Antibacterial ion addition means 15: Pretreatment water line 20: NF membrane module and / or RO membrane module 21: Permeate water line 22: Concentrated water line 30: Antibacterial ion addition means 40: Bypass line 50: Flow rate adjustment valve 60: Backflow prevention valve 70: Concentrated water adjustment valve 80: Pressurization means 100: Bobbin filter 110: Activated carbon filter for pretreatment 120: Reverse osmosis membrane module 121: Concentrated water line 122: Permeated water line 130: Reservoir tank 140: Adsorbent filter for permeated water treatment 141: Water purification line 150: Faucet

Claims (4)

At least a tap water line to which tap water is supplied, a pretreatment means having antibacterial ion addition means for adding antibacterial ions to the tap water, and before the pretreated water pretreated by the pretreatment means is sent. A treated water line, a pressurizing means for pressure-feeding the pretreated water disposed in the pretreated water line, and the pretreated water fed under pressure by the pressurizing means with permeated water and concentrated water A nanofiltration (NF) membrane module and / or a reverse osmosis (RO) membrane module, a permeate line provided on the permeate side of the NF membrane module and / or the RO membrane module, and a concentrated water side a tap water processing apparatus including a concentrated water lines provided, said pre-processing means, a filter for removing foreign matter in tap water, and the filter medium layer for removing residual chlorine, the antibacterial ion adding means Equipped with a form of being accommodated in a single cartridge, the water tap water treatment device has one end connected to any portion of the concentrated water line, the pretreatment other end of said pre-treated water line And a bypass line connected to any part between the pressurizing means and the bypass line, the bypass line is provided with a flow rate adjusting valve and a backflow prevention valve, and is sent to the bypass line. A tap water treatment apparatus characterized in that the amount of water is 10 to 70% of the amount of pretreated water . The tap water treatment apparatus according to claim 1 , wherein the antibacterial ion adding means is configured to add antibacterial ions to tap water that has passed through the filter. The tap water treatment apparatus according to claim 1 or 2 , wherein the antibacterial ions are silver ions or copper ions. The tap water treatment apparatus according to any one of claims 1 to 3 , further comprising antibacterial ion adding means for adding antibacterial ions to any part of the permeate water line.

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