Hardness component removal device and pure water production system

Abstract

Provided is a hardness component removal device which integrates iron and manganese removal treatment and cation exchange treatment, suppresses deterioration of each water treatment material, and enables efficient cleaning and regeneration. A hardness component removal device (100) is provided with: a water treatment container (1) which is divided into at least three treatment units in the vertical direction by partitions (11, 12); the first treatment part (21) and the iron and manganese removal catalyst layer (31) are arranged on the uppermost partition plate (11); the second treatment part (22) and the activated carbon layer (32) are arranged on the partition plate (12) at the lower section; a third treatment unit (23) and a cation exchange resin layer (33) that are lower than the separator (12); the first water passing pipe (41) leads to the outside from the upper part of the water treatment container (1); the second water passing pipe (42) is led to the outside from the upper part of the iron and manganese removal catalyst layer; the third water passing pipe (43) is led to the outside from the upper part of the activated carbon layer (32); the fourth water passing pipe (44) is led to the outside from the upper part of the cation exchange resin layer (33); and the fifth water passing pipe (45) leads to the outside from the lower part (1) of the water treatment container.

Description

Technical Field

[0001] The present invention relates to a hardness component removal device for removing hardness components in water by integrating three water treatment materials, and a pure water production system using the device. Background Art

[0002] In the past, as a water treatment system that uses raw water such as well water and tap water as treated water and generates treated water by removing impurities in the water, it is known that there is a technology that has an iron removal and manganese removal device on the water supply pipeline (for example, refer to Patent Document 1). The iron removal and manganese removal device removes the iron and manganese components contained in the raw water. The water treatment system is composed of an iron removal and manganese removal treatment device, an activated carbon device, a cation exchange resin tower, and a water pipe connecting them, so that the treated water passes through the iron removal and manganese removal treatment device, the activated carbon device, and the cation exchange resin tower in sequence through the water pipe, and the hardness metal ions (iron, manganese, calcium, magnesium, sodium, etc.) in the treated water are removed to generate treated water.

[0003] Furthermore, in a water treatment apparatus that performs filtration treatment and ion exchange treatment, in order to reduce the installation area of ​​the apparatus, a water treatment apparatus that integrates these treatments has been proposed (for example, refer to Patent Document 2).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2011-083666

[0007] Patent Document 2: Japanese Patent Application Laid-Open No. 10-80683 Summary of the invention

[0008] Problem that the invention aims to solve

[0009] In the water treatment system equipped with the above-mentioned iron and manganese removal device, it is necessary to wash the filter material, wash the iron and manganese removal treatment material, and regenerate the deteriorated cation exchange resin according to the repeated water treatment. However, in this water treatment system, it is necessary to wash or regenerate the iron and manganese removal treatment device, the activated carbon device, and the cation exchange resin tower separately, so there is a problem of increasing the amount of washing wastewater and regeneration wastewater.

[0010] On the other hand, in a water treatment device that integrates filtration treatment and ion exchange treatment, when regenerating the ion exchange treatment material, the acidic or alkaline regeneration liquid contacts the filter material, causing early degradation of the filter material and possibly deteriorating the water quality.

[0011] In addition, the iron and manganese removal treatment and the activated carbon treatment at the subsequent stage are catalytic treatments, and ideally, regeneration is not required. However, since the turbidity-causing substances, particles, and microorganisms in the raw water adhere to the treatment materials, the same cleaning as the filtration treatment is required. On the other hand, if the amount of ion exchange loaded exceeds the ion exchange capacity, the ion exchange treatment will no longer work, so regeneration is necessary. The cleaning period of the iron and manganese removal treatment materials and the activated carbon treatment materials is not necessarily the same as the regeneration period of the ion exchange treatment materials. Therefore, for example, at 10m 3 In large-scale equipment with a flow rate of 1000 tonnes or more, it is considered that a water treatment device that integrates these filtration treatments and ion exchange treatments is not very effective.

[0012] The present invention is completed to solve the above-mentioned problems, and its purpose is to provide a hardness component removal device which integrates iron and manganese removal treatment and cation exchange treatment, suppresses the deterioration of each water treatment material, and can perform efficient cleaning and regeneration.

[0013] Technical Solution

[0014] The present invention is as follows.

[0015] [1] A hardness component removal device, the hardness component removal device comprising: a water treatment container having at least two water-permeable partitions therein, the partitions being divided into at least three treatment sections in the vertical direction; a first treatment section located on the uppermost partition of the two partitions; an iron and manganese removal catalyst layer disposed in the first treatment section; a second treatment section located on the lower partition of the two partitions; an activated carbon layer disposed in the second treatment section; a third treatment section located below the lower partition of the two partitions; a cation exchange resin layer disposed in the third treatment section; a first water pipe extending from the upper part of the water treatment container to the outside; a second water pipe disposed in the first treatment section and extending from the upper part of the iron and manganese removal catalyst layer to the outside; a third water pipe disposed in the second treatment section and extending from the upper part of the activated carbon layer to the outside; a fourth water pipe disposed in the third treatment section and extending from the upper part of the cation exchange resin layer to the outside; and a fifth water pipe extending from the lower part of the water treatment container to the outside.

[0016] [2] The hardness component removal device according to [1], further comprising: a sixth water pipe that passes through the cation exchange resin layer and leads to the outside.

[0017] [3] The hardness component removing device according to [1] or [2], further comprising a lowermost partition plate at the bottom of the third processing section.

[0018] [4] A hardness component removal device according to any one of [1] to [3], wherein the hardness component removal device further comprises: a raw water supply mechanism for allowing treated water to be introduced from the second water pipe; an oxidant supply mechanism for adding an oxidant to the treated water; and a treated water discharge mechanism for allowing the treated water after passing through the iron and manganese removal catalyst layer, the activated carbon layer and the cation exchange resin layer to be discharged as treated water from the fifth water pipe.

[0019] [5] A hardness component removal device according to any one of [1] to [4], wherein the hardness component removal device also has: a first backwash water supply mechanism, which allows backwash water to flow from the fifth water pipe into the upper direction of the cation exchange resin layer; and a first backwash water discharge mechanism, which allows the backwash water after passing through the cation exchange resin layer to be discharged from the fourth water pipe.

[0020] [6] A hardness component removal device according to any one of [2] to [5], wherein the hardness component removal device also comprises: a first regeneration liquid supply mechanism, which allows the regeneration liquid to pass from the fifth water pipe into the upper direction of the cation exchange resin layer, and allows the regeneration pressurized water to pass from the fourth water pipe; and a first regeneration liquid discharge mechanism, which allows the regeneration liquid and the regeneration pressurized water after passing through the cation exchange resin layer to be discharged from the sixth water pipe.

[0021] [7] A hardness component removal device according to any one of [1] to [6], wherein the hardness component removal device also has: a second backwash water supply mechanism, allowing backwash water to pass from the fourth water pipe to the upper direction of the activated carbon layer and the iron and manganese removal catalyst layer; and a second backwash water discharge mechanism, allowing the backwash water after passing through the activated carbon layer and the iron and manganese removal catalyst layer to be discharged from the first water pipe.

[0022] [8] The hardness component removing device according to any one of [4] to [7], wherein the raw water supply mechanism supplies raw water at a rate of 500 L / hour to 120,000 L / hour.

[0023] [9] A pure water production system, which comprises, in sequence: a hardness component removal device, a degassing device and a reverse osmosis membrane device as described in any one of [1] to [8], and the pure water production system also comprises: piping for connecting the various devices and transporting treated water; and an alkali adding device for adding alkali to the supply water of the reverse osmosis membrane device to adjust the pH of the supply water to be greater than 9 and less than 11.

[0024]

[10] A pure water production system, which comprises, in sequence: a hardness component removal device, a degassing device and an anion exchange resin device as described in any one of [1] to [8], and the pure water production system also comprises: piping for connecting the various devices to transport the treated water.

[0025] In addition, in this specification, the symbol "to" represents a numerical range that is greater than or equal to a value on the left side of the symbol and less than or equal to a value on the right side.

[0026] Beneficial Effects

[0027] According to the hardness component removing device of the present invention, the iron and manganese removal treatment and the cation exchange treatment are integrated, and the deterioration of each water treatment material is suppressed, so that cleaning and regeneration can be performed efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view schematically showing the hard component removing device 100 according to the first embodiment.

[0029] Figure 2 It is a cross-sectional view schematically showing a hardness component removing device 200 according to the second embodiment.

[0030] Figure 3 It is a diagram schematically showing the flow direction of air in the air backwashing process according to the embodiment.

[0031] Figure 4 This is a diagram schematically showing the flow direction of backwash water in the backwash step of the cation exchange resin according to the embodiment.

[0032] Figure 5 This is a diagram schematically showing the flow direction of backwash water in the backwashing step of the iron and manganese removal catalyst and activated carbon according to the embodiment.

[0033] Figure 6 This is a diagram schematically showing the flow directions of the regeneration liquid and the regeneration pressurized water in the regeneration step of the cation exchange resin according to the embodiment.

[0034] Figure 7 It is a diagram schematically showing the flow direction of washing water in the washing step according to the embodiment.

[0035] Figure 8 This is a flowchart schematically showing the pure water production system 300 according to the first embodiment.

[0036] Fig. 9 This is a flowchart schematically showing the pure water production system 400 according to the second embodiment. DETAILED DESCRIPTION

[0037] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 A vertical section of the hardness component removing device 100 according to the first embodiment of the present invention is schematically shown.

[0038] (Hardness component removal device)

[0039] Figure 1 The hardness component removal device 100 shown in the figure is equipped with a water treatment container 1 that can accommodate water treatment materials inside. The water treatment container 1 is, for example, a water treatment tower formed into a hollow cylindrical shape by a strong steel material such as rolled steel for general structure. The inner wall surface of the water treatment container 1 can be lined with a hard natural rubber sheet. If the tower height of the water treatment container 1 is preferably more than 2m and less than 7m, more preferably more than 4m and less than 6m, and the internal volume of the water treatment container is preferably more than 700L and less than 58000L, more preferably more than 1500L and less than 50000L, it is easy to significantly obtain the effect of the present invention. As for the hardness component removal device 100 of this embodiment, since the tower height is suppressed, it can be set up without problem even in a building of a semiconductor manufacturing plant, for example.

[0040] Inside the water treatment container 1, two water-permeable partitions are provided to separate the interior of the water treatment container from top to bottom. These partitions are referred to as the first partition 11 and the second partition 12 from the top to the bottom of the water treatment container 1. Through the first partition 11 and the second partition 12, the internal space of the water treatment container 1 is divided into at least three in the up and down directions, and these three internal spaces constitute the first treatment unit 21, the second treatment unit 22, and the third treatment unit 23 from the top to the bottom of the water treatment container. As long as the effect of the present invention is not impaired, there may be more than three partitions. The hardness component removal device 100 of this embodiment uses the above-mentioned partition, so there is no need for the support bed (gravel, etc.) of the filter material used in the previous water treatment tower, which can simplify the device structure and make the device lightweight. In addition, since the water flow resistance in the hardness component removal device 100 can be reduced, the power consumption of the device can be suppressed. It should be noted that the up and down here refers to the direction of gravity as down, and the opposite direction of gravity as up.

[0041] The structure of the partition used for the first partition 11 and the second partition 12 is not particularly limited as long as it is a structure that water can flow through and the water treatment material (iron and manganese removal catalyst, activated carbon, cation exchange resin) cannot pass through. As a partition, a filter that allows water to flow through a slit or mesh can be used. The first partition 11 and the second partition 12 can be separately arranged and fixed in the water treatment container 1, or they can be formed integrally with the water treatment container 1.

[0042] The first treatment section 21 is located above the first partition 11 in the water treatment container 1, and is composed of the first partition 11 as the bottom surface, the upper inner wall of the water treatment container 1 as the wall surface, and the upper surface of the water treatment container 1 as the upper surface. An iron removal and manganese removal catalyst layer 31 is provided in the first treatment section 21. The iron removal and manganese removal catalyst layer 31 is arranged lower than the upper surface of the first treatment section 21, and the space above the iron removal and manganese removal catalyst layer 31 is a space of a predetermined volume.

[0043] The occupied height (layer height) of the iron and manganese removal catalyst layer 31 in the first treatment section 21 is preferably more than 0.5 times and less than 0.8 times the height of the first treatment section 21. If the occupied height (layer height) of the iron and manganese removal catalyst layer 31 is within the above range, the following phenomenon (channel phenomenon) can be eliminated: when water is passed, the filling density of the iron and manganese removal catalyst becomes a locally uneven state, and a large space is generated in the iron and manganese removal catalyst layer 31, and the treated water flows through the space at a large flow rate. In addition, in addition to being able to inhibit the iron and manganese removal catalysts from adhering to each other due to microorganisms and the like to form large blocks (clamping), there is also an effect of easily discharging deposits such as scum and impurities in the iron and manganese removal catalyst layer 31.

[0044] The iron and manganese removal catalyst layer 31 is formed by stacking iron and manganese removal catalysts to remove iron and manganese in the treated water. The iron and manganese removal catalyst is, for example, a crushed granular filter material with a catalyst coating on the surface. The catalyst coating acts as a catalyst for the reaction between manganese ions in water and oxidants. As iron and manganese removal catalysts suitable for the iron and manganese removal catalyst layer 31, there are listed: MS series, ferrite (Ferrolite) MC series, ferrite (Ferrolite) GC series (manufactured by TOHKEMY Co., Ltd.), manganese sand manufactured by Japan Raw Materials Co., Ltd., manganese dioxide particles, etc. The iron and manganese removal catalysts can be used alone, or two or more can be mixed or stacked and used.

[0045] The second treatment section 22 is located near the center of the height direction in the water treatment container 1, and is composed of the first partition plate 11 as the upper surface, the inner wall of the central part of the water treatment container 1 as the wall surface, and the upper surface of the second partition plate 12 as the bottom surface. An activated carbon layer 32 is provided in the second treatment section 22. The activated carbon layer 32 is arranged lower than the upper surface of the second treatment section 22, and the space above the activated carbon layer 32 is a space of a predetermined volume.

[0046] The occupied height (layer height) of the activated carbon layer 32 in the second treatment section 22 is preferably not less than 0.5 times and not more than 0.8 times the height of the second treatment section 22. If the occupied height (layer height) of the activated carbon layer 32 is within the above range, in addition to suppressing the channeling phenomenon and densification during water flow, there is also an effect of facilitating the discharge of deposits such as scum and impurities in the activated carbon layer 32.

[0047] The activated carbon layer 32 is formed by stacking activated carbons to remove suspended solids (SS) and total organic carbon (TOC) in the treated water. The activated carbon constituting the activated carbon layer 32 is petroleum-based activated carbon, coal-based activated carbon, coconut shell charcoal, etc. From the perspective of increasing the packing density and reducing the mixing of dust into the cation exchange resin in the rear section, the activated carbon is preferably petroleum-based activated carbon or coconut shell charcoal. The shape of the activated carbon is spherical, ellipsoidal, amorphous granular, and powdered. Among them, spherical activated carbon is preferred from the perspective of reducing dust. When spherical activated carbon is used, its average particle size is preferably 0.2 mm or more, preferably 1.0 mm or less. In addition, activated carbon that carries catalysts such as silver on the surface of the activated carbon to improve the bactericidal effect and the decomposition effect of the oxidant can also be used. The hardness of the activated carbon is preferably 90% or more, preferably 95% or more. It should be noted that the average particle size and hardness of the activated carbon are values ​​measured according to the sieving method of JIS K 1474:2014.

[0048] Examples of activated carbon suitable for the activated carbon layer 32 include spherical activated carbon BAC (manufactured by KUREHA Co., Ltd.) and Evadia (registered trademark, manufactured by Swing Co., Ltd.) The activated carbon may be used alone or in combination of two or more kinds thereof, such as a mixture or a stack.

[0049] The third treatment section 23 is located below the second partition 12 in the water treatment container 1, with the bottom surface of the water treatment container 1 as the bottom surface, the lower inner wall of the water treatment container 1 as the wall surface, and the second partition 12 as the top surface. A cation exchange resin layer 33 is provided in the third treatment section 23. The cation exchange resin layer 33 is arranged lower than the upper surface of the third treatment section 23, and the space above the cation exchange resin layer 33 is a space of a predetermined volume.

[0050] The occupied height (layer height) of the cation exchange resin layer 33 in the third treatment section 23 is preferably not less than 0.5 times and not more than 0.8 times the height of the third treatment section 23. If the occupied height (layer height) of the cation exchange resin layer 33 is within the above range, in addition to suppressing the channeling phenomenon and densification during water flow, there is also an effect of facilitating the discharge of deposits such as scum and impurities in the cation exchange resin layer 33.

[0051] The cation exchange resin layer 33 is formed by stacking cation exchange resins, and removes cations in the treated water, such as metal ions such as Na, K, Ca, and Mg. The cation exchange resin has a sodium-type or hydrogen-type ion exchange group, and the Na or H of the ion exchange group exchanges with cations in the water to remove the above cations from the treated water. Examples of cation exchange resins include: strongly acidic cation exchange resins and weakly acidic cation exchange resins. Since the treatment in the latter stage can be simplified, the cation exchange group of the cation exchange resin is preferably hydrogen-type. It should be noted that when the hardness component in the raw water is more than 100 mg / L in terms of CaCO3, the sodium type is preferably used because the regeneration frequency is suppressed. The shape of the cation exchange resin is, for example, granular.

[0052] Examples of the strongly acidic cation exchange resin include AmberLite (registered trademark) IR120B, IR124, 200CT252, Amberjet 1020, 1024, 1060, 1220, and C-255LFH manufactured by DDP Specialty Products Japan Co., Ltd., DIAION (registered trademark) SK104, SK1B, SK110, SK112, PK208, PK212L, PK216, PK218, PK220, PK228, UBK08, UBK10, and UBK12 manufactured by Purolite, C100, C100E, C120E, C100x10, C100x12MB, C150, C160, and SGC650 manufactured by Levatit, and Monoplus manufactured by Levatit. S108H, SP112, S1668, Duolite (registered trademark) C20, C20LF, C255LFH, C26CH manufactured by SUMIKA Chemtex Co., Ltd., and the like.

[0053] Examples of the weakly acidic cation exchange resin include FPC3500 and IRC76 manufactured by ORGANO, DIAION WK10, WK11, WK100, and WK40L manufactured by MITSUBISHI CHEMICALS, C104, C106, C107E, C115E, and SSTC104 manufactured by Purolite, and CNP80WS manufactured by Levatit.

[0054] As the cation exchange resin, among the above, C-255LFH manufactured by DDP Specialty Products Japan Co., Ltd. is preferred. The cation exchange resin may be used alone or in combination of two or more kinds thereof, which may be mixed or layered.

[0055] In the hardness component removing device 100 of the present embodiment, the volume ratio of the iron and manganese removal catalyst layer 31, the activated carbon layer 32, and the cation exchange resin layer 33 is preferably 0.7 to 0.3, more preferably 1 to 0.2, from the viewpoint of obtaining high-purity treated water. The volume ratio of the cation exchange resin layer 33 to the iron and manganese removal catalyst layer 31 is preferably 1 to 0.2, more preferably 0.6 to 0.4.

[0056] An opening is provided at the upper part of the water treatment container 1, and a first water pipe 41 is connected to the opening. In addition, four openings are provided at different heights of the wall surface of the water treatment container 1, and the second water pipe 42, the third water pipe 43, the fourth water pipe 44, and the sixth water pipe 46 are connected to the openings in order from the top. In addition, an opening is provided at the lower part of the water treatment container 1, and a fifth water pipe 45 is connected to the opening. In addition, a net or the like through which liquid can flow but cation exchange resin cannot pass is provided at the opening at the lower part of the water treatment container 1. Through the first water pipe 41, the second water pipe 42, the third water pipe 43, the fourth water pipe 44, the fifth water pipe 45, and the sixth water pipe 46, the interior of the water treatment container 1 is connected to the outside, respectively, and air, water, and other specified liquids can flow in the specified directions inside and outside the water treatment container through each water pipe.

[0057] The second water pipe 42 is configured so that in the upper space of the first treatment section 21 where the iron and manganese removal catalyst layer 31 is not disposed, the water or liquid flowing through the second water pipe 42 is spread all over the upper surface of the iron and manganese removal catalyst layer 31. With such a configuration, the backwash water during the backwashing of the iron and manganese removal catalyst can be discharged from the entire upper surface of the iron and manganese removal catalyst layer 31 through the second water pipe 42.

[0058] The third water pipe 43 is configured so that in the upper space of the second treatment section 22 where the activated carbon layer 32 is not disposed, the water or liquid flowing through the third water pipe 43 is spread all over the upper surface of the activated carbon layer 32. With such a configuration, when the activated carbon is backwashed, the backwash water can be discharged from the upper part of the activated carbon layer 32 as a whole through the third water pipe 43.

[0059] The fourth water pipe 44 is configured so that, in the upper space of the third treatment section 23 where the cation exchange resin layer 33 is not disposed, the water or liquid flowing through the fourth water pipe 44 is spread all over the upper surface of the cation exchange resin layer 33. With such a configuration, the backwash water during the backwashing of the cation exchange resin can be discharged from the upper part of the cation exchange resin layer 33 as a whole through the fourth water pipe 44.

[0060] The sixth water pipe 46 penetrates the inside of the cation exchange resin layer 33 in the third treatment unit 23. The sixth water pipe 46 is configured so that water or liquid flowing from the upper part to the lower part of the sixth water pipe 46 is collected from the entire cross section of the cation exchange resin layer 33. With such a configuration, water or liquid flowing from the lower part of the cation exchange resin layer 33 to the upper part can also be discharged through the sixth water pipe 46.

[0061] The water pipes constituting the second water pipe 42, the third water pipe 43, the fourth water pipe 44, and the sixth water pipe 46 are, for example, respectively composed of a main pipe and a plurality of branch pipes branching from the main pipe. Specifically, each water pipe can be composed of a main pipe and a branch pipe connected to the main pipe through a lateral pipe. In this structure, the main pipe passes through the opening of the wall of the water treatment container 1, and the branch pipe is arranged in the entire cross-section of each treatment part inside the water treatment container. A plurality of openings through which a specified liquid can flow are provided on at least one side of the main pipe and the branch pipe. It should be noted that each water pipe is not limited to having only one main pipe, but may also be in the form of having more than two main pipes and a plurality of branch pipes connected thereto.

[0062] The first water pipe 41, the second water pipe 42, the third water pipe 43, the fourth water pipe 44, and the fifth water pipe 45 are respectively provided with valves V1, V2, V3, V4, and V5 on the paths outside the water treatment container 1, and pumps P1, P2, P3, P4, and P5 are respectively provided on the outside. A valve V6 is installed outside the water treatment container 1 of the sixth water pipe 46. Valves V1 to V6 are, for example, on-off valves or flow regulating valves for opening and closing the flow paths of each water pipe, or automatic on-off valves or automatic flow regulating valves that can be automatically controlled. Pumps P1 to P5 are, for example, delivery pumps for circulating a specified liquid to each water pipe.

[0063] The second water pipe 42 is connected to a drug injection pump D as an oxidant supply device. The drug injection pump D is composed of a pump and an injection pipe for quantitatively injecting the oxidant into the second water pipe 42, and the pump is, for example, a diaphragm or an electromagnetically driven pump. In addition, the hardness component removal device 100 may also include a control device (not shown) that automatically controls the valves V1 to V6, pumps P1 to P5, and the drug injection pump D according to a pre-input program.

[0064] Next, refer to Figure 2 A hardness component removing device 200 according to the second embodiment will be described. Figure 2 A vertical section of a hardness component removing device 200 according to a second embodiment of the present invention is schematically shown.

[0065] The hardness component removing device 200 of the second embodiment is different from the hardness component removing device 100 of the first embodiment in that it has three partitions, but the other structures are the same as the hardness component removing device 100 of the first embodiment, so the same reference numerals are attached to the same structures and detailed description is omitted.

[0066] The hardness component removal device 200 of the second embodiment has a third partition plate 13 below the second partition plate 12. The preferred embodiment of the third partition plate 13 is the same as that of the first partition plate 11. The third partition plate 13 can be arranged and fixed in the water treatment container 1, or can be formed integrally with the water treatment container 1. In the hardness component removal device 200, the third treatment section 23 is located below the second partition plate 12 at the bottom of the water treatment container 1, and is composed of the third partition plate 13 as the bottom surface, the lower inner wall of the water treatment container 1 as the wall surface, and the second partition plate 12 as the upper surface. A cation exchange resin layer 33 is provided in the third treatment section 23. The cation exchange resin layer 33 is arranged lower than the upper surface of the third treatment section 23, and the upper part of the cation exchange resin layer 33 is a space of a predetermined volume.

[0067] (Water treatment method)

[0068] Next, refer to Figure 1 , a water treatment method using the hardness component removing device 100 is described.

[0069] First, through the control device, valves V2 and valve V5 are opened, and other valves (valves V1, V3, V4, and V6) are closed. Using pump P2, raw water such as tap water and well water is supplied to the water treatment container 1 as treated water via the second water pipe 42. At this time, the injection pump D quantitatively adds an oxidant to the raw water flowing through the second water pipe 42. The oxidant is, for example, hypochlorous acid or hypochlorite, preferably sodium hypochlorite. It should be noted that the water quality of the raw water is, for example, pH 6 or less, Mn is 0.1 to 3 mg / L, hardness is 20 to 200 mg / L in terms of CaCO3, turbidity is 20 or less, and alkalinity is 100 mg / L or less in terms of CaCO3. When hypochlorite is used, the amount of oxidant added is preferably 3 to 5 mass ppm in terms of chlorine (Cl2) concentration. It should be noted that valve V2 and pump P2 constitute a raw water supply mechanism.

[0070] The amount of raw water supplied by the raw water supply mechanism is preferably 500L / h to 120,000L / h, and more preferably 10,000L / h to 120,000L / h. If the amount of raw water supplied is within the above range, the scale of the device becomes larger, thereby increasing the effects of integration of water treatment materials, sharing of various mechanisms for backwashing and regeneration, and sharing of backwashing water. In addition, since the scale of the device is large, it can be particularly suitable for the production of pure water and ultrapure water for semiconductor and liquid crystal manufacturing.

[0071] The raw water to which the oxidant is added is spread from the openings of the main pipe and the branch pipe constituting the second water pipe 42 from the top to the bottom of the first treatment unit 21, and flows through the iron and manganese removal catalyst layer 31. The manganese ions and iron ions in the raw water react with the oxidant and become insoluble. In the process of the raw water flowing through the iron and manganese removal catalyst layer 31, the insoluble iron and manganese are adsorbed on the catalyst layer. A part of the manganese ions is not insoluble and remains in the raw water, but the manganese ions are insoluble due to the catalytic action of the iron and manganese removal catalyst layer 31, and the insoluble manganese is adsorbed on the catalyst layer. Thus, the iron and manganese in the raw water are removed.

[0072] In the hardness component removal device 100 of the present embodiment, the space velocity of the treated water in the iron and manganese removal catalyst layer 31 is preferably 10 to 20 (1 / h). The space velocity can be adjusted by the discharge pressure of the pump P2 and the inverter control of the pump P2. In addition, a flow regulating valve can be used as the valve V2 on the outlet side of the pump P2, and the space velocity can be adjusted by the flow regulating valve.

[0073] Next, the treated water from which iron and manganese have been removed passes through the first partition 11 disposed at the bottom of the iron and manganese removal catalyst layer 31, flows into the second treatment unit 22, and then flows through the activated carbon layer 32. In the process of the treated water flowing through the activated carbon layer 32, the suspended matter (SS) and total organic carbon (TOC) contained in the treated water are adsorbed on the activated carbon and removed from the treated water. In addition, the oxidant is decomposed by the activated carbon to become chloride ions, which are adsorbed on the activated carbon. The decomposed oxidant here is mainly the oxidant (residual chlorine) that remains in the treated water in the oxidant added by the injection pump D without reacting with iron and manganese. By flowing through the iron and manganese removal catalyst layer 31, the treated water is rectified, so that the treated water can flow through the activated carbon layer 32 without deviation in flow rate and speed. Therefore, the treatment load on the activated carbon is evenly applied from the upper part of the activated carbon layer 32, so the surplus part of the activated carbon filling amount used in the past can be omitted. As a result, the amount of activated carbon filled in the water treatment container can be reduced, the device can be miniaturized, and sufficient treated water quality can be obtained. In addition, the residual chlorine in the treated water is adsorbed and removed by the activated carbon layer 32, so the deterioration of the cation exchange resin in the subsequent stage can be suppressed, resulting in improved treated water quality. It should be noted that in the case of a single-layer bed tower of activated carbon alone, an inert filter material is sometimes laid on the upper layer of the activated carbon layer, but this is not required in the hardness component removal device 100 of this embodiment. Therefore, the filling layer height of the activated carbon layer 32 can be reduced by, for example, 40% to 80% compared to a single-layer bed tower of activated carbon alone.

[0074] In the hardness component removal device 100 of the present embodiment, the space velocity of the treated water in the activated carbon layer 32 is preferably 20 to 40 (1 / h). The space velocity can be adjusted by the discharge pressure of the pump P2 and the inverter control of the pump P2. In addition, a flow regulating valve can be used as the valve V2 on the outlet side of the pump P2, and the space velocity can be adjusted by the flow regulating valve.

[0075] Next, the treated water from which residual chlorine has been removed passes through the second partition plate 12 disposed at the bottom of the activated carbon layer 32, is spread downward from the top of the third treatment unit 23, and flows through the cation exchange resin layer 33. When a cation exchange resin regenerated with an acid, i.e., a hydrogen-type cation exchange resin, is used as the cation exchange resin, in the process of the treated water flowing through the cation exchange resin layer 33, metal ions such as Na, K, Ca, and Mg contained in the treated water undergo ion exchange and are removed from the treated water to generate treated water. In addition, in the case of a cation exchange resin regenerated with, for example, sodium chloride, i.e., a sodium-type cation exchange resin, as the cation exchange resin, in the process of the treated water flowing through the cation exchange resin layer 33, Na and K contained in the treated water are removed. At this time, by flowing through the iron and manganese removal catalyst layer 31 and the activated carbon layer 32, the treated water is also rectified, so that the treated water can flow through the cation exchange resin layer 33 without deviation in flow rate and speed. Therefore, the processing load on the cation exchange resin is evenly applied from above the resin layer 33, so the amount of cation exchange resin filled in the water treatment container can be reduced, the device can be miniaturized, and sufficient treated water quality can be obtained. It should be noted that in the case of a single-layer bed tower of a single cation exchange resin, an inert filter material is sometimes laid on the upper layer of the cation exchange resin, but in the hardness component removal device 100 of the present embodiment, the treated water is directly supplied from the iron and manganese removal catalyst layer 31 and the activated carbon layer 32 to the cation exchange resin layer 33, so it is rectified when passing through them, so there is no need to configure an inert filter material. Therefore, the filling layer height of the cation exchange resin layer 33 can be reduced by, for example, 40% to 80% compared with a single-layer bed tower of a single cation exchange resin.

[0076] In the hardness component removal device 100 of this embodiment, the space velocity of the treated water in the cation exchange resin layer 33 is preferably 10 to 40 (1 / h). The space velocity can be adjusted by the discharge pressure of the pump P2 and the inverter control of the pump P2. In addition, a flow regulating valve can be used as the valve V2 on the outlet side of the pump P2, and the space velocity can be adjusted by the flow regulating valve.

[0077] The treated water flows in the fifth water pipe 45, is discharged to the outside, and is taken in. As for the water quality of the treated water obtained here, for example, the manganese concentration is less than 0.05 ppm, the iron concentration is less than 0.3 ppm, the chlorine concentration is less than 0.1 ppm, and the TOC is less than 300 μgC / L. It should be noted that the valve V5 constitutes a treated water discharge mechanism.

[0078] (Cleaning / regeneration device and cleaning / regeneration method)

[0079] Next, the cleaning / backwashing device and regeneration device of the hardness component removal device 100 of the embodiment, and the cleaning / backwashing method and regeneration method using them are described. The cleaning / backwashing and regeneration of the hardness component removal device 100 of the embodiment are usually performed in the following order, but any steps can be combined or the order can be changed as needed. In addition, these steps can be performed by automatically controlling valves and pumps by a control device according to a pre-input program.

[0080] (1) Air backwash process.

[0081] (2) Backwashing process of cation exchange resin.

[0082] (3) Backwashing process for removing iron and manganese catalysts and activated carbon.

[0083] (4) Regeneration process of cation exchange resin.

[0084] (5) Cleaning process.

[0085] (1) Air backwash process.

[0086] Figure 3 FIG. 2 is a diagram schematically showing the flow direction of air during the air backwashing process. Figure 3 In the figure, thick arrows are used to indicate the direction of air flow. Figure 1 The same components as shown are denoted by the same reference numerals and their descriptions are omitted, and some components are omitted for illustration. Figure 4 to Figure 7 The same is true in Chinese.

[0087] The air backwashing process is performed after all the liquid in the hardness component removal device 100 is discharged. In the air backwashing process, valves V2 and V5 are opened, and the other valves (valves V1, V3, V4, and V6) are closed, and air is sent toward the top of the hardness component removal device 100 through the fifth water pipe 45 by a blower (not shown). The sent air passes through the cation exchange resin layer 33, the activated carbon layer 32, and the iron and manganese removal catalyst layer 31 in sequence, and is discharged from the second water pipe 42. The condensed cation exchange resin, activated carbon, and iron and manganese removal catalyst are untied and unfolded by the sent air, and the attached materials attached to them are peeled off. As a result, the cleaning accuracy in the subsequent (2) cation exchange resin backwashing process and (3) iron and manganese removal catalyst and activated carbon backwashing process can be improved. According to the hardness component removal device 100 of this embodiment, air backwashing can be simply performed without equipping special equipment, thereby extending the life of the water treatment material. Here, the blower and valve V5 constitute an air supply mechanism, and the valve V2 constitutes an air exhaust mechanism. It should be noted that the air backwashing process is not necessary, and it is preferably performed when the attachments are accumulated on the cation exchange resin, activated carbon, and iron and manganese removal catalysts respectively due to long-term use of the hardness component removal device 100, or when the resins, activated carbon, and iron and manganese removal catalysts in each layer of the cation exchange resin layer 33, the activated carbon layer 32, and the iron and manganese removal catalyst layer 31 are attached to each other and become agglomerates (i.e., densification of bacteria, etc.). It should be noted that, usually, even in a water treatment system where cation exchange resin, activated carbon, and iron and manganese removal catalysts are used respectively in a single-layer bed tower, it is desirable to set a blower in order to perform air backwashing, but since the frequency of use of the blower is low, a blower is mostly not set in reality. In the hardness component removal device 100 of this embodiment, air backwashing of the cation exchange resin layer 33, the activated carbon layer 32, and the iron and manganese removal catalyst layer 31 can be performed with a single blower, thereby solving this problem.

[0088] (2) Backwashing process of cation exchange resin.

[0089] Figure 4 This is a diagram schematically showing the flow direction of backwash water in the backwash process of a cation exchange resin. Figure 4 In the figure, thick arrows are used to indicate the direction of liquid flow. Figure 5 to Figure 7The same is true in the backwash process of the cation exchange resin. In the backwash process of the cation exchange resin, open valve V4 and valve V5, close other valves (valves V1, V2, V3, V6), and use pump P5 to send backwash water through the fifth water pipe 45 toward the top of the hardness component removal device 100. The backwash water is usually pure water or ultrapure water. The sent backwash water flows through the cation exchange resin layer 33 and is discharged from the fourth water pipe 44. Through the backwash process of the cation exchange resin, the attachments of the cation exchange resin are washed and removed. It should be noted that pump P5 and valve V5 constitute a first backwash water supply mechanism, and valve V4 constitutes a first backwash water discharge mechanism. The hardness component removal device 100 of this embodiment is provided with the fourth water-passing pipe 44 and the fifth water-passing pipe 45, and the valves V4, V5, and the pumps P4, P5 attached thereto, so that the cation exchange resin can be regenerated separately, and the regenerated drainage is discharged to the outside of the hardness component removal device 100 without contacting the activated carbon and the iron and manganese removal catalyst. Therefore, the deterioration of the activated carbon and the iron and manganese removal catalyst can be suppressed to the maximum extent, and high-quality treated water can be obtained for a long time.

[0090] (3) Backwashing process for removing iron and manganese catalysts and activated carbon.

[0091] Figure 5 This is a diagram schematically showing the flow direction of backwash water in the backwash process of the iron and manganese removal catalyst and activated carbon. In the backwash process of the iron and manganese removal catalyst and activated carbon, valves V1 and V4 are opened, other valves (valves V2, V3, V5, V6) are closed, and backwash water is sent to the top of the hardness component removal device 100 via the fourth water pipe 44 using pump P4. The sent backwash water flows through the activated carbon layer 32 and the iron and manganese removal catalyst layer 31 in sequence and is discharged from the first water pipe 41. Through the backwash process of the iron and manganese removal catalyst and activated carbon, the attachments of the iron and manganese removal catalyst and the attachments of the activated carbon are washed and removed. It should be noted that pump P4 and valve V4 constitute a second backwash water supply mechanism, and valve V1 constitutes a second backwash water discharge mechanism. By using the hardness component removal device 100 of this embodiment, the backwash process of the iron and manganese removal catalyst and activated carbon can be carried out at the same time, and the amount of backwash water and backwash drainage can be reduced. It should be noted that (3) the backwashing step of the iron and manganese removal catalyst and the activated carbon and the later-described (4) regeneration step of the cation exchange resin are preferably performed at the same time.

[0092] (4) Regeneration process of cation exchange resin

[0093] Figure 6This is a diagram schematically showing the flow direction of the regeneration liquid and the regeneration pressurized water in the regeneration process of the cation exchange resin. In the regeneration process of the cation exchange resin, valves V4, V5, and V6 are opened, and other valves (valves V1, V2, and V3) are closed. The regeneration liquid is made to flow from the fifth water pipe 45 toward the top of the hardness component removal device 100 by using pump P5. At the same time, the regeneration pressurized water is supplied from the fourth water pipe 44 by using pump P4. The regeneration liquid and control water flowing through the cation exchange resin layer 33 are discharged to the outside of the hardness component removal device 100 through the sixth water pipe 46. The regeneration pressurized water here is pure water or ultrapure water, just like the backwash water. The water flow causes the ion exchange resin stacked above the sixth water pipe 46 to apply a load downward, and plays a role in controlling the ion exchange resin below the sixth water pipe 46 to float due to the regeneration liquid flowing upward. The regeneration liquid is a substance that releases the metal ions captured by the ion exchange group, and is a sodium hydroxide aqueous solution, a sodium chloride aqueous solution, dilute hydrochloric acid, etc. It should be noted that the pump P4, the pump P5, the valve V4, and the valve V5 constitute a first regeneration liquid supply mechanism, and the valve V6 constitutes a first regeneration liquid discharge mechanism.

[0094] (5) Cleaning process

[0095] Figure 7 1 is a diagram schematically showing the flow direction of the washing water in the washing process. In the washing process, in order to make the washing water flow through the entire tower of the hardness component removal device 100, valves V2 and valve V5 are opened, and other valves (valves V1, V3, V4, and V6) are closed, and the washing water is sent to the hardness component removal device 100 through the second water pipe 42 by pump P2. The washed water flows through the iron and manganese removal catalyst layer 31, the activated carbon layer 32, and the cation exchange resin layer 33 in sequence, and is discharged from the fifth water pipe 45. Through the washing process, in addition to the attached matter of the activated carbon, the attached matter of the iron and manganese removal catalyst, and the attached matter of the cation exchange resin, the regeneration liquid remaining on the cation exchange resin for regeneration of the cation exchange resin is also washed and removed. According to the hardness component removal device 100 of this embodiment, the activated carbon and the iron and manganese removal catalyst from which the attachments have been removed by backwashing, and the regenerated cation exchange resin can be cleaned together, thereby reducing the amount of cleaning water, the cleaning time, and the cleaning burden (cleaning workload), and quickly restarting the next water treatment. It should be noted that the valve V2 and the pump P2 constitute the first cleaning water supply mechanism, and the valve V5 constitutes the first cleaning water discharge mechanism.

[0096] Next, the cleaning process of the cation exchange resin (2-1) as a modified example of the backwashing process of the cation exchange resin (2) is described. The cleaning process of the cation exchange resin (2-1) differs from the backwashing process of the cation exchange resin (2) in the following aspects: In the cleaning process of the cation exchange resin (2-1), the flow direction of the backwash water (washing water) is the same as the flow direction of the treated water during water treatment (countercurrent). In the process of this modified example, valves V4 and valve V5 are opened, and other valves (valves V1, V2, V3, V6) are closed. Washing water is supplied from the fourth water pipe 44 by pump P4. The washing water flows through the cation exchange resin layer 33 and is then discharged to the outside of the water treatment container 1 via the fifth water pipe 45. It should be noted that valve V4 and pump P4 constitute a second washing water supply mechanism, and valve V5 constitutes a second washing water discharge mechanism.

[0097] Next, the countercurrent regeneration process of the cation exchange resin (4-1) as a modified example of the regeneration process of the cation exchange resin (4) is described. The countercurrent regeneration process of the cation exchange resin (4-1) differs from the regeneration process of the cation exchange resin (4) in the following aspects: In the countercurrent regeneration process of the cation exchange resin (4-1), the flow direction of the regeneration liquid is the same as the flow direction of the treated water during water treatment (countercurrent). In the process of this modified example, valves V4 and valve V5 are opened, and other valves (valves V1, V2, V3, V6) are closed. The regeneration liquid is supplied from the fourth water pipe 44 by pump P4. The regeneration liquid flows through the cation exchange resin layer 33 and is then discharged to the outside of the water treatment container 1 via the fifth water pipe 45. It should be noted that valve V4 and pump P4 constitute a second regeneration liquid supply mechanism, and valve V5 constitutes a second regeneration liquid discharge mechanism. In addition, in this modified example, a sodium chloride aqueous solution is preferably used as the regeneration liquid.

[0098] Next, the regeneration process of the cation exchange resin using a sodium chloride aqueous solution (4-2) as another variation of the regeneration process of the cation exchange resin (4) is described. In the process of this variation, valves V2 and V5 are opened, and the other valves (valves V1, V3, V4, and V6) are closed. The flow path of the regeneration liquid in the process of this variation is similar to that of Figure 3 The same. The regeneration liquid is supplied from the fifth water pipe 45 by using pump P5. The regeneration liquid flows through the cation exchange resin layer 33, then flows through the activated carbon layer 32 and the iron and manganese removal catalyst layer 31, and is discharged to the outside of the water treatment container 1 through the second water pipe 42. It should be noted that valve V5 and pump P5 constitute a third regeneration liquid supply mechanism, and valve V2 constitutes a third regeneration liquid discharge mechanism. According to the regeneration method, the activated carbon layer 32 and the iron and manganese removal catalyst layer 31 can be backwashed using the regeneration waste liquid of the cation exchange resin, thereby reducing the backwashing water and backwashing wastewater.

[0099] Next, as a modified example of (3) the backwashing process of the iron and manganese removal catalyst and the activated carbon, a method for backwashing the activated carbon and the iron and manganese removal catalyst respectively is described. In this method, the backwashing process of the activated carbon and the backwashing process of the iron and manganese removal catalyst are performed respectively. The backwashing process of the activated carbon and the backwashing process of the iron and manganese removal catalyst can be performed only in one, and can also be performed in any order. In the backwashing process of the activated carbon, valves V3 and valve V4 are opened, and the other valves (valves V1, V2, V5, V6) are closed. Backwashing water is supplied from the fourth water pipe 44 by pump P4. The backwashing water flows through the activated carbon layer 32 and is then discharged to the outside of the water treatment container 1 via the third water pipe 43. In the backwashing process of the iron and manganese removal catalyst, valves V1 and valve V3 are opened, and the other valves (valves V2, V4, V5, V6) are closed. Backwashing water is supplied from the third water pipe 43 by pump P3. The backwash water flows through the iron and manganese removal catalyst layer 31, and then is discharged to the outside of the hardness component removal device 100 through the first water pipe 41. The valve V4 and the pump P4 constitute the third backwash water supply mechanism, and the valve V3 constitutes the third backwash water discharge mechanism. In addition, the valve V3 and the pump P3 constitute the fourth backwash water supply mechanism, and the valve V1 constitutes the third backwash water discharge mechanism.

[0100] (Ultrapure water production system)

[0101] Here, a pure water production system using the hardness component removing device 100 according to the present embodiment will be described. Figure 8 This is a flowchart schematically showing the pure water production system 300 according to the first embodiment. Figure 8 The pure water manufacturing system 300 shown in the figure is provided with the above-mentioned hardness component removal device 100, degassing device (DG) 101 and reverse osmosis membrane device (RO) 102 in sequence, and the pure water manufacturing system 300 is also provided with piping to connect each device and transport the treated water. The degassing device (DG) 101 is, for example, a normal pressure degassing tower, which removes carbon dioxide gas from the treated water. The reverse osmosis membrane device (RO) 102 removes salts, ionic organic matter, and colloidal organic matter from the treated water. In addition, the pure water manufacturing system 300 has an alkali addition device D1, which is arranged in front of the reverse osmosis membrane device 102, and adds alkali to the supply water flowing in the piping on the supply side of the reverse osmosis membrane device 102 to adjust the pH of the supply water. In addition, a regenerative mixed bed ion exchange device or an electric regeneration ion exchange device can also be provided in the rear section of the reverse osmosis membrane device (RO) 102. In addition, a deoxidation device such as an ultraviolet irradiation device, a degassing membrane or a vacuum degassing device may be provided between the reverse osmosis membrane device (RO) 102 and the regenerative mixed bed ion exchange device or the electric regeneration ion exchange device.

[0102] In the pure water manufacturing system 300, the hardness component removal device 100 at the front stage removes the hardness component in the treated water, and the degassing device 101 removes the carbon dioxide gas in the water. Alkali is injected into the treated water from which the hardness component and carbon dioxide gas are removed, and the pH of the treated water is adjusted to a high pH of about 9 to 11. By supplying the treated water adjusted to a high pH to the reverse osmosis membrane device 102, silica in the water can be removed efficiently in the reverse osmosis membrane device 102, and a high water recovery rate (RO permeate water volume / RO supply water volume) can be achieved. In particular, the hardness component removal device 100 not only removes the hardness component with high precision, but also improves the cleaning efficiency, thereby significantly reducing the mixing of impurities into the water, which contributes to the improvement of the treatment efficiency of the pure water manufacturing system 300. As an alkali, sodium hydroxide or potassium hydroxide is generally used, but it is not limited to this. The water quality of the pure water obtained by the pure water manufacturing system 300 is, for example, a TOC concentration of 5μgC / L or less and a resistivity of 17MΩ·cm or more.

[0103] Fig. 9 This is a flowchart schematically showing the pure water production system 400 according to the second embodiment. Fig. 9 The pure water manufacturing system 400 shown in the figure is provided with the above-mentioned hardness component removal device 100, the degassing device (DG) 105 and the anion exchange resin device 106 in sequence, and the pure water manufacturing system 400 is also provided with piping to connect these devices and transport the treated water. The degassing device (DG) 105 is, for example, a normal pressure degassing tower, which removes carbon dioxide gas from the treated water. The anion exchange resin device 106 is a resin tower filled with a resin capable of anion exchange, such as a strong basic anion exchange resin or a weak basic anion exchange resin, which removes anion components (Cl - 、NO3 - 、SO4 2- etc.) to be removed.

[0104] In the pure water manufacturing system 400, the hardness component removal device 100 at the front stage removes the hardness component in the treated water, and the degassing device 105 removes the carbon dioxide gas in the water. The treated water from which the hardness component and carbon dioxide gas have been removed is supplied to the anion exchange resin device 106, whereby the anion exchange resin device 106 can efficiently remove the anion component. In particular, the hardness component removal device 100 not only removes the hardness component with high precision, but also improves the cleaning efficiency, thereby significantly reducing the mixing of impurities into the water, which contributes to the improvement of the treatment efficiency of the pure water manufacturing system 400. The water quality of the pure water obtained by the pure water manufacturing system 300 is, for example, a TOC concentration of 5 μgC / L or less and a resistivity of 17 MΩ·cm or more.

[0105] It should be noted that the above-mentioned pure water production system 300 and pure water production system 400 may also have a pump and a valve for conveying the treated water at any part of the piping path. In addition, the pure water production system 300 and pure water production system 400 may also have a sand filter device at the front stage of the hardness component removal device 100 according to the quality of the raw water. In this case, the suspended matter in the raw water can be removed by the sand filter device, reducing the load of the subsequent system.

[0106] Explanation of symbols

[0107] 100, 200: hardness component removal device; 1: water treatment container; 11: first partition; 12: second partition; 13: third partition; 21: first treatment section; 22: second treatment section; 23: third treatment section; 31: iron and manganese removal catalyst layer; 32: activated carbon layer; 33: cation exchange resin layer; D: injection pump; V1~V6: valves; P1~P5: pumps; 101: degassing device (DG); 102: reverse osmosis membrane device (RO); 105: degassing device (DG); 106: anion exchange resin device; D1: alkali addition device; 300, 400: pure water manufacturing system.

Claims

1. A hardness component removing device, comprising: A water treatment container, having at least two water-permeable partitions inside, and divided into at least three treatment sections in the vertical direction by the partitions; A first processing section is located on the uppermost partition of the two partitions; An iron and manganese removal catalyst layer is disposed in the first treatment section; A second processing part is located on the partition in the lower middle section of the two partitions; an activated carbon layer, disposed in the second processing section; a third processing section, which is located below the lower partition of the two partitions; a cation exchange resin layer, disposed in the third treatment section; A first water pipe extending from the upper part of the water treatment container to the outside; a second water pipe, disposed in the first treatment section, extending from above the iron and manganese removal catalyst layer to the outside; a third water pipe, disposed in the second treatment section and extending from above the activated carbon layer to the outside; a fourth water pipe, disposed in the third treatment section, and extending from above the cation exchange resin layer to the outside; and The fifth water pipe leads from the lower part of the water treatment container to the outside.

2. The hardness component removing device according to claim 1, wherein: The invention also comprises a sixth water pipe which passes through the cation exchange resin layer and leads to the outside.

3. The hardness component removing device according to claim 1, wherein: A lowermost partition is also provided at the lower portion of the third processing section.

4. The hardness component removing device according to claim 1, wherein: The hardness component removing device further comprises: The raw water supply mechanism allows the treated water to flow in from the second water pipe; An oxidant supply device for adding an oxidant to the treated water; and The treated water discharge mechanism discharges the treated water after passing through the iron and manganese removal catalyst layer, the activated carbon layer and the cation exchange resin layer as treated water from the fifth water pipe.

5. The hardness component removing device according to claim 1, wherein: The hardness component removing device further comprises: A first backwash water supply mechanism allows backwash water to flow from the fifth water pipe into the upper direction of the cation exchange resin layer; and The first backwash water discharge mechanism discharges the backwash water after passing through the cation exchange resin layer from the fourth water pipe.

6. The hardness component removing device according to claim 2, wherein: The hardness component removing device further comprises: a first regeneration liquid supply mechanism, which allows the regeneration liquid to flow from the fifth water pipe into the upper direction of the cation exchange resin layer, and allows the regeneration pressurized water to flow from the fourth water pipe; and The first regeneration liquid discharge mechanism discharges the regeneration liquid and the regeneration pressurized water after passing through the cation exchange resin layer from the sixth water passage pipe.

7. The hardness component removing device according to claim 1, wherein: The hardness component removing device further comprises: A second backwash water supply mechanism allows backwash water to flow from the fourth water pipe to the upper direction of the activated carbon layer and the iron and manganese removal catalyst layer; and The second backwash water discharge mechanism discharges the backwash water after passing through the activated carbon layer and the iron and manganese removal catalyst layer from the first water pipe.

8. The hardness component removing device according to claim 4, wherein: The raw water supply mechanism supplies raw water at 500 L / hour or more and 120,000 L / hour or less.

9. A pure water production system, comprising: a hardness component removal device according to claim 1 or 2, a degassing device, and a reverse osmosis membrane device in sequence, The pure water production system further comprises: a pipe connecting the devices to transport the treated water; and The alkali adding device adds alkali to the feed water of the reverse osmosis membrane device to adjust the pH of the feed water to 9 or more and 11 or less.

10. A pure water production system, comprising: a hardness component removal device according to claim 1 or 2, a degassing device, and an anion exchange resin device in this order, The pure water production system further includes: pipes connecting the various devices and transporting the treated water.

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