WO2011040278A1 - イオン交換装置及びその塔体、並びに水処理装置 - Google Patents
イオン交換装置及びその塔体、並びに水処理装置 Download PDFInfo
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- WO2011040278A1 WO2011040278A1 PCT/JP2010/066225 JP2010066225W WO2011040278A1 WO 2011040278 A1 WO2011040278 A1 WO 2011040278A1 JP 2010066225 W JP2010066225 W JP 2010066225W WO 2011040278 A1 WO2011040278 A1 WO 2011040278A1
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- exchange resin
- water
- ion exchange
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- resin
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J47/00—Ion-exchange processes in general; Apparatus therefor
- B01J47/02—Column or bed processes
- B01J47/026—Column or bed processes using columns or beds of different ion exchange materials in series
- B01J47/028—Column or bed processes using columns or beds of different ion exchange materials in series with alternately arranged cationic and anionic exchangers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J49/00—Regeneration or reactivation of ion-exchangers; Apparatus therefor
- B01J49/05—Regeneration or reactivation of ion-exchangers; Apparatus therefor of fixed beds
- B01J49/08—Regeneration or reactivation of ion-exchangers; Apparatus therefor of fixed beds containing cationic and anionic exchangers in separate beds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/422—Treatment of water, waste water, or sewage by ion-exchange using anionic exchangers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Definitions
- the present invention relates to a regenerative ion exchange apparatus comprising an anion exchange resin and a cation exchange resin, and a tower for the same.
- the present invention also relates to a water treatment apparatus provided with this ion exchange device.
- Ion exchange devices are widely used in pure water and ultrapure water production facilities in the electronics industry. As one of the ion exchange devices, a mixed bed type ion exchange device is well known.
- the mixed bed type ion exchange apparatus includes an ion exchange tower having a mixed ion exchange resin layer in which a strongly acidic cation exchange resin and a strongly basic anion exchange resin are mixed. High-purity pure water is produced by simultaneously exchanging cations and anions in water. When each ion exchange resin is regenerated, the mixed ion exchange resin layer is backwashed and separated in the same column. Due to the specific gravity difference of each ion exchange resin, a strong basic anion exchange resin layer is formed in the upper layer and a strong acidity is formed in the lower layer. After forming the cation exchange resin layer, the respective regenerants are passed through each ion exchange resin layer to regenerate both ion exchange resins individually. This regeneration operation may be performed in the same column, or each ion exchange resin may be individually extracted in another column and may be individually regenerated in each column.
- reverse regeneration In the conventional mixed bed type ion exchange apparatus, there may be a problem due to incomplete separation of the cation / anion exchange resin called “reverse regeneration”.
- the cation exchange resin is used in the H form, and its regeneration is performed by passing an acid solution.
- the anion exchange resin is used in the OH form, and its regeneration is performed by passing an alkaline solution.
- the mixed bed is subjected to upward flowing water, and the anion exchange resin and the cation exchange resin are separated by a specific gravity difference, and then the acid, For example, an aqueous HCl solution is introduced from the bottom of the tower to regenerate the cation exchange resin, and an alkali, for example, an aqueous NaOH solution is introduced from the top of the tower to regenerate the anion exchange resin.
- Each regeneration waste liquid is discharged from a discharge pipe provided at the interface between the anion exchange resin bed and the cation exchange resin bed. Thereafter, N 2 gas is introduced from the bottom of the tower, the anion exchange resin and the ion exchange resin are mixed to form a mixed bed, and water flow is resumed.
- Patent Document 1 divides the inside of a tower into two upper and lower chambers with a water-based partition plate, and cation exchange is performed in one chamber. A resin is filled and the other chamber is filled with an anion exchange resin.
- FIGS. 5 and 11 of Patent Document 1 the inside of the tower is partitioned into two upper and lower chambers with a water-based partition plate, the lower chamber is filled with a cation exchange resin, the upper chamber is filled with an anion exchange resin, Is passed from the upper chamber to the lower chamber, and water is passed in the order of anion exchange resin ⁇ cation exchange resin.
- this partition plate permits the flow of water, the flow of the ion exchange resin is blocked, and mixing of the anion exchange resin and the cation exchange resin is prevented.
- the tower body of this patent document 1 is a single tower type, and an apparatus area is small.
- the partition plate that partitions the anion exchange resin layer and the cation exchange resin layer is water-permeable, so that during regeneration, the acid solution for cation exchange resin regeneration passes through the partition plate. In reverse contact with the anion exchange resin occurs. Further, reverse regeneration occurs when the alkaline solution for anion exchange resin regeneration passes through the partition plate and comes into contact with the cation exchange resin.
- paragraphs 0023, 0027, and 0028 of Patent Document 1 it is described that pure water is passed as balance water so that one regenerant does not flow into the other ion exchange resin layer during regeneration. Insufficient to completely prevent the contamination of the material, it causes reverse regeneration.
- the present invention provides an ion exchange apparatus capable of reliably preventing reverse regeneration of an anion exchange resin and a cation exchange resin inside a tower and producing high-quality deionized water even immediately after the regeneration, and a tower body therefor. With the goal.
- the present invention also prevents the precipitation of scale on the anion exchange resin inside the tower, and reliably prevents reverse regeneration of the anion exchange resin and the cation exchange resin, and stably produces high-quality deionized water. It aims at providing the water treatment apparatus which can do.
- the ion exchange apparatus tower of the first aspect is an ion exchange apparatus tower filled with an ion exchange resin.
- an upper chamber and a lower chamber are partitioned by a water shielding partition plate.
- the upper chamber and the lower chamber are communicated with each other by a communication means routed outside the tower body.
- the ion exchange apparatus includes the tower for the ion exchange apparatus according to the first aspect, a cation exchange resin accommodated in one of the upper chamber and the lower chamber of the tower body, and an anion exchange resin accommodated in the other. Is provided.
- the ion exchange apparatus is the same as the ion exchange apparatus according to the second aspect, wherein an upper supply / discharge pipe for supplying or discharging liquid to the upper part of the upper chamber and a lower supply for supplying or discharging liquid to the lower part of the lower chamber.
- the communication means includes a first communication pipe for supplying and discharging liquid to the lower part of the upper chamber and a second communication for supplying and discharging liquid to the upper part of the lower chamber.
- a replenisher supplying / discharging means provided respectively.
- the ion exchange apparatus is the ion exchange apparatus according to the third aspect, wherein water is allowed to pass through the upper portion of the upper chamber, the lower portion of the upper chamber, the upper portion of the lower chamber, and the lower portion of the lower chamber, but the passage of the ion exchange resin is prevented.
- a water distribution member is disposed, and ends of the upper supply / discharge pipe, the first communication pipe, the second communication pipe, and the lower supply / discharge pipe are respectively connected to the water collection / distribution member. is there.
- the ion exchange device is the ion exchange apparatus according to the fourth aspect, wherein the upper part of the upper chamber and the upper part of the lower chamber are filled with granular inert resin, respectively. Each of the water distribution members is embedded in the inert resin.
- the water treatment apparatus includes the ion exchange apparatus according to any one of the second to fifth aspects, and a hardness component removing unit provided in the preceding stage of the ion exchange apparatus.
- the water treatment device is the sixth aspect, wherein the ion exchange device is configured such that the water to be treated first comes into contact with the anion exchange resin and then comes into contact with the cation exchange resin. Is.
- the upper chamber and the lower chamber are partitioned by a water shielding partition plate, the cation exchange resin is accommodated in one chamber, and the anion exchange resin is accommodated in the other chamber. Yes.
- the treated water (raw water) is supplied to one chamber, flows into the other chamber through the communication means, and is taken out from the other chamber.
- the tower body of the present invention is divided into upper and lower two chambers by a partition plate, and requires less installation space and less pipe length than those in which an anion exchange tower and a cation exchange tower are separately installed.
- the ion exchange resin chambers filled with the ion exchange resin are separated by a single partition plate, the height of the ion exchange device can be reduced. Moreover, it can be manufactured at low cost.
- acid or alkali can be easily passed through the upper chamber and the lower chamber through the first communication pipe and the second communication pipe, respectively, and the regeneration can be performed efficiently. At this time, the mixture of acid and alkali is completely prevented by closing the third communication pipe. And the ion exchange resin of an upper chamber and a lower chamber can be reproduced
- the ion exchange device of the fourth aspect local retention of water does not occur in the upper chamber and the lower chamber, and it is possible to efficiently produce treated water (deionized water) and regenerate the ion exchange resin. it can.
- the upper chamber and the lower chamber are filled with an inert resin, and the flow of the ion exchange resin is suppressed.
- the ion exchange resin flows, there is a possibility that the water quality is deteriorated because the liquid is not uniformly contacted with the ion exchange resin at the time of water sampling or regeneration. Treated water with quality can be obtained.
- the flow direction of the water to be treated and the regenerant at the time of sampling and regeneration is not particularly limited, but it is possible to obtain treated water with higher water quality when sampling water is flowing upward and regeneration is flowing downward. This is desirable.
- this ion exchange device when water is passed in the order of anion exchange resin ⁇ cation exchange resin, generation of scale components in the anion exchange resin of the ion exchange device is prevented. In addition, since the water to be treated first comes into contact with the anion exchange resin in the ion exchange device, metal components such as Na flowing out from the anion exchange resin are captured by the cation exchange resin.
- the pH of the water to be treated becomes high, and the water to be treated having a high pH comes into contact with the cation exchange resin.
- the anion exchange resin and the cation exchange resin are sequentially passed through the ion exchange apparatus, thereby improving the quality of the treated water and substantial ion exchange of the cation exchange resin.
- Increases capacity By adjusting the resin volume ratio to the exchange capacity ratio, both the cation exchange resin and the anion exchange resin can be used up at the time of regeneration, and the economy can be improved.
- the volume ratio of the cation exchange resin and the anion exchange resin is changed according to the substantial exchange capacity of these elements, thereby further improving the economic efficiency. Improvements can be made.
- FIGS. 1a and 1b an embodiment of an ion exchange tower and an ion exchange apparatus according to the present invention will be described.
- the tower body 1 has an outer shell composed of a cylindrical portion 1a whose vertical direction is the cylinder axis direction, a top end plate portion 1b, and a bottom end plate portion 1c.
- the end plate portion 1b is convexly curved upward
- the end plate portion 1c is convexly curved downward.
- the inside of the tower body 1 is divided into two chambers, an upper chamber 20 and a lower chamber 30, by a water shielding partition plate 2.
- the partition plate 2 is made of metal or synthetic resin that does not allow water to pass through at all, and is curved downward and convex like the end plate portion 1c.
- the peripheral edge of the partition plate 2 is watertightly coupled to the inner peripheral surface of the cylindrical portion 1a by welding or the like.
- the first water collection / distribution member 4 is disposed in the upper part of the upper chamber 20, and the upper water supply / discharge pipe 3 is connected to the first water collection / distribution member 4.
- a second water collection / distribution member 6 is installed in the lower part of the upper chamber 20, and the first communication pipe 5 is connected to the water collection / distribution member 6.
- a third water collection / distribution member 9 is installed in the upper part of the lower chamber 30, and the second communication pipe 8 is connected to the water collection / distribution member 9.
- the communication pipes 5 and 8 are connected by a third communication pipe 11, and a valve 12 is installed in the communication pipe 11.
- Valves 7 and 10 are provided at the end portions of the communication pipes 5 and 8 as supply and discharge means for the regenerated liquid, respectively.
- a fourth water collection / distribution member 14 is installed in the lower part of the lower chamber 30, and a lower water supply / discharge pipe 13 is installed in the water collection / distribution member 14.
- Most of the inside of the upper chamber 20 is filled with a cation exchange resin 21, and a granular inert resin 22 is filled above the cation exchange resin 21.
- the first water collection / distribution member 4 is embedded in the inert resin 22.
- the inert resin a polyacrylonitrile resin having a specific gravity smaller than that of the ion exchange resin is used.
- the particle size of the inert resin is preferably about the same as that of the ion exchange resin.
- a water collecting plate used in a conventional ion exchange device a strainer provided with a large number of slits in a radially extending pipe, or the like can be used.
- a strainer having a slit width of about 0.2 mm.
- the water collecting and distributing members 4 and 14 have shapes along the end plate portion 1b and the end plate portion 1c, respectively, and the dead space along the end plate portion 1b and the end plate portion 1c is small. Further, the water collecting and distributing members 6 and 9 have a shape along the partition plate 2, and a dead space along the partition plate 2 is small.
- Fig. 1a shows the flow during production (collection) of deionized water using this ion exchange device.
- the valve 12 is opened, the valves 7 and 10 are closed, and raw water (treated water) is supplied from the lower supply / discharge pipe 13.
- the raw water is collected and distributed 14, anion exchange resin 31, inert resin 32, collection and distribution member 9, communication pipes 8, 11 and 5, collection and distribution member 6, cation exchange resin 21, inert resin 22, collection and distribution member 4. Then, it flows in the order of the upper supply / discharge pipe 3 and is taken out as treated water (deionized water).
- the valve 12 is closed and the valves 7 and 10 are opened as shown in FIG. 1b, and an acid solution such as HCl or H 2 SO 4 is supplied from the upper supply / discharge pipe 3.
- an alkaline solution such as NaOH is supplied from the second communication pipe 8.
- the acid solution flows in the order of the water collection / distribution member 4, the inert resin 22, the cation exchange resin 21, the water collection / distribution member 6, the communication pipe 5, and the valve 7, and flows out as recycled wastewater (acid). Played.
- the alkaline solution flows in the order of the water collection / distribution member 9, the inert resin 32, the anion exchange resin 31, the water collection / distribution member 14, and the lower supply / discharge pipe 13, and flows out as recycled wastewater (alkali). Played.
- This ion-exchange apparatus is one in which one tower body 1 is partitioned into two upper and lower chambers by one partition plate 2, and the height of the tower body is low and the installation space is also small. Also, the pipes 5, 11, and 8 communicating the upper chamber 20 and the lower chamber 30 can be shortened.
- the water collecting and distributing members 4, 6, 9, and 14 are provided along the end plate portion 1b, the partition plate 2, and the end plate portion 1c, so that local retention of water is prevented.
- the upper chamber 20 and the lower chamber 30 are filled with inert resins 22 and 32 to prevent the cation exchange resin 21 and the anion exchange resin 31 from flowing. Are uniformly contacted with the cation exchange resin 21 and the anion exchange resin 31, so that high-quality deionized water can be obtained and sufficient regeneration can be performed.
- the cation exchange resin is accommodated in the upper chamber 20 and the anion exchange resin is accommodated in the lower chamber 30, but the reverse is also possible.
- the upper chamber 20 and the lower chamber 30 are connected via the piping 5,11,8, as long as the exterior of the tower body 1 is drawn around, it is not limited to this.
- the three valves 7, 10, 12 are used, but the flow path may be switched using two three-way valves.
- FIG. 2 is a flowchart of the water treatment apparatus according to the embodiment.
- the raw water is passed through the ion exchange device 42 after the hardness component is removed by the hardness component removing means 41.
- This ion exchange device 42 is configured as shown in FIGS. 1a and 1b.
- the tower body 1 is partitioned into two upper and lower chambers by a partition plate 2, the lower chamber is filled with an anion exchange resin 31, and the upper chamber is a cation.
- the exchange resin 21 is filled.
- the raw water from which the hardness component has been removed first comes into contact with the anion exchange resin 31 to remove the anions, and then comes into contact with the cation exchange resin 21 to remove cations and become treated water.
- a hardness component removal means a reverse osmosis apparatus (RO apparatus), an ion exchange apparatus, etc. are mentioned. These hardness component removing means may be used only in one stage, or may be two or more stages connected in series, or two or more kinds of hardness component removing means may be connected in series. Examples of the structure of the water treatment apparatus of the present invention including the hardness component removing means are as follows (a) to (j).
- RO—ion exchange apparatus (b) RO-RO—ion exchange apparatus according to the present invention (c) RO—degassing apparatus—ion exchange apparatus according to the present invention (d) degassing apparatus—RO -Ion exchange device according to the present invention (e) Deaeration device-RO-RO-Ion exchange device according to the present invention (f) RO-Deaeration device-RO-Ion exchange device according to the present invention (g) RO-RO -Deaeration device-Ion exchange device according to the invention (h) Ion exchange device-Ion exchange device according to the invention (i) Ion exchange device-Deaeration device-Ion exchange device according to the invention (j) Ion exchange device -Deaeration device-Ion exchange device-Ion exchange device according to the present invention
- the valve 12 is opened and the valves 7 and 10 are opened.
- the raw water from the lower supply / discharge pipe 13 is closed, and the water collection / distribution member 14, the anion exchange resin 31, the inert resin 32, the water collection / distribution member 9, the communication pipes 8, 12, 5, the water collection / distribution member 6, the cation exchange resin 21, Even if metal ions such as Na are eluted from the anion exchange resin 31 by flowing the inert resin 22, the water collecting / distributing member 4, and the upper supply / discharge pipe 3 in this order, the metal ions are captured by the cation exchange resin 21. Does not leak into the treated water.
- the ion exchange resin usually has a different total exchange capacity between the cation exchange resin and the anion exchange resin.
- the amount of the anion exchange resin should be larger than the volume of the cation exchange resin.
- the volume of the anion exchange resin is preferably 1.5 to 5 times the volume of the cation exchange resin.
- the volume resin ratio should be matched to the actual exchange capacity of these weak bases, as well as the total exchange capacity as shown below. It is preferable to use a volume resin ratio.
- Example 1 Comparative Example 1
- the ion exchange apparatus shown in FIGS. 1a and 1b was used.
- the specifications are as follows.
- Comparative Example 1 a commercially available mixed-bed ion exchange apparatus was used. The specifications are as follows. Tower diameter: 450mm Tower height: 4000 mm Volume: 640L Filling amount of cation exchange resin: 150L Anion exchange resin filling amount: 200L
- Example 1 and Comparative Example 1 the following were used as the anion exchange resin and cation exchange resin.
- Anion exchange resin Strongly basic anion exchange resin “Dow 550A”
- Cation exchange resin Strongly acidic cation exchange resin “Dow 650C”
- RO treated water (conductivity: 5 ⁇ S / cm, metal Na: 1 ppm, chloride ion: 1 ppm, SiO 2 : 1 ppm) was passed through each ion exchange device for a certain period of time, and then the following acid solution and alkali solution were used. At the same time, it was regenerated and the quality of the treated water was confirmed.
- Operating conditions RO treated water flow rate: 15 m 3 / h
- Regeneration conditions Acid solution HCl concentration: 5% by weight Water flow rate: 0.75 m 3 / h, 30 minutes
- Table 2 shows changes over time in the specific resistance value of the treated water when the RO treatment water was passed under the same conditions in the ion exchange apparatus regenerated in Example 1 and Comparative Example 1 to start the water sampling process. Show.
- Table 3 shows the quality of the treated water after 1 hour has passed since the start of water collection after regeneration.
- the water quality rise time can be shortened (Table 2) and purified (Table 3) by reverse regeneration, compared to the conventional mixed bed ion exchange column.
- the anion exchange resin and the cation exchange resin can be regenerated at the same time, the regenerating time can be halved, and the apparatus cost and installation area are equal or less.
- Example 2 Simulated raw water, which will be described later, was passed through an RO device as a hardness component removing means and then passed through an ion exchange device shown in FIGS. 1a and 1b.
- the main conditions of this ion exchange apparatus are as follows.
- Regeneration conditions The regeneration solution is as follows. HCl aqueous solution: HCl concentration 5% by weight, water flow rate: 1 L / h, 30 minutes NaOH aqueous solution: NaOH concentration 5% by weight, water flow rate: 2 L / h, heating 40 ° C., 30 minutes Regeneration solution is as follows: The liquid was passed through. 30 minutes (chemical flow time) ⁇ 30 minutes ultrapure water flow (chemical extrusion time) ⁇ 15 minutes raw water flow (operation switching time)
- RO membrane ES-20-D (Nitto Denko Corporation)
- RO operating conditions 75% recovery
- RO treated water Mg concentration: 1 mg / L Na concentration: 1 mg / L
- Simulated raw water is prepared by dissolving 60 mg / L-asCa of MgCl 2 and 50 mg / L-asNa of NaCl in ultrapure water and degassing by membrane degassing.
- the deaeration membrane used was Liqui-Cel DX-50 (Celgard).
- Example 2 The simulated raw water was treated in the same manner as in Example 2 except that the simulated raw water was directly passed through the ion exchange device without passing through the RO device.
- magnesium hydroxide scale was generated in the anion exchange resin layer immediately after the start of water flow, making it difficult to continue water flow.
- Example 2 the simulated raw water was passed through the RO device, then first passed through the cation exchange resin, and then passed through the anion exchange resin. That is, the water flow order of the anion exchange resin and the cation exchange resin was reversed from that in Example 2. Except this, water was passed in the same manner as in Example 2. As a result, as shown in Table 4, it was confirmed that the Na concentration in the treated water 1 Hr after passing through after regeneration was 3 ppt, which was several times higher than that in Example 2. The Na concentration of treated water for 360 hours from the start of water flow is shown in FIG.
- Example 3 The anion exchange resin and the cation exchange resin used in Example 2 were used in the same amount as in Example 2, mixed to form a mixed bed, and the water flow during regeneration was as follows: Except for the above, water was passed under the same conditions as in Example 2. As a result, as shown in Table 4, the Na concentration in the treated water after 1 Hr of water after regeneration was 52 ppt. The Na concentration of treated water for 360 hours from the start of water flow is shown in FIG.
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Abstract
Description
この結果、水質の良好なイオン交換処理水を長期にわたって安定して生産することが可能となる。
(a) RO-本発明に係るイオン交換装置
(b) RO-RO-本発明に係るイオン交換装置
(c) RO-脱気装置-本発明に係るイオン交換装置
(d) 脱気装置-RO-本発明に係るイオン交換装置
(e) 脱気装置-RO-RO-本発明に係るイオン交換装置
(f) RO-脱気装置-RO-本発明に係るイオン交換装置
(g) RO-RO-脱気装置-本発明に係るイオン交換装置
(h) イオン交換装置-本発明に係るイオン交換装置
(i) イオン交換装置-脱気装置-本発明に係るイオン交換装置
(j) イオン交換装置-脱気装置-イオン交換装置-本発明に係るイオン交換装置
下記の表1に例を示す通り、通常イオン交換樹脂はカチオン交換樹脂とアニオン交換樹脂とで総交換容量が異なる。一般的には、カチオン交換樹脂の方が総交換容量が多く、給水のイオンがカチオン、アニオン当量であるとするならば、アニオン交換樹脂量をカチオン交換樹脂に比べて体積として多めにするのが好ましい。例えばアニオン交換樹脂の体積量をカチオン交換樹脂の体積量の1.5~5倍とするのが好ましい。また、ホウ素やシリカといった弱塩基の除去性をあげる必要があった場合、下に例を示す通り体積樹脂比を総交換容量を合わせるだけでなく、これら弱塩基の実質的な交換キャパシティーに合わせた体積樹脂比率とするのが好ましい。
実施例1では図1a,1bに示すイオン交換装置を用いた。諸元は次の通りである。
塔体直径 : 450mm
塔体の高さ : 3000mm
上室容積 : 190L
下室容積 : 260L
カチオン交換樹脂21の充填量 : 150L
アニオン交換樹脂31の充填量 : 200L
不活性樹脂22の充填量 : 30L
不活性樹脂32の充填量 : 30L
塔体直径 : 450mm
塔体の高さ : 4000mm
容積 : 640L
カチオン交換樹脂の充填量 : 150L
アニオン交換樹脂の充填量 : 200L
アニオン交換樹脂:強塩基性陰イオン交換樹脂「Dow 550A」
カチオン交換樹脂:強酸性陽イオン交換樹脂「Dow 650C」
(1) 運転条件
RO処理水通水流量:15m3/h
(2) 再生条件
酸溶液
HCl濃度:5重量%
通水流量:0.75m3/h、30分
アルカリ溶液
NaOH濃度:5重量%
通水流量:1m3/h、加温40℃、40分
実施例1のイオン交換装置の再生時間(min)は、40(薬品通液時間)+40(純水による薬品押出時間)+5(純水で洗浄しながら排水)+15(純水の循環洗浄)=100minであった。
一方、比較例1の従来型混床式イオン交換装置再生時間は、10(樹脂分離時間)+30(カチオン交換樹脂:薬品通液時間)+30(カチオン交換樹脂:薬品押出時間)+40(アニオン交換樹脂:薬品通液時間)+40(アニオン交換樹脂:薬品押出時間)+5(純水で洗浄しながら排水)+15(樹脂混合時間)+30(循環洗浄)=200minであった。
後述の模擬原水を硬度成分除去手段としてのRO装置に通水してから図1a,1bに示すイオン交換装置に通水した。このイオン交換装置の主な条件は次の通りである。
(1)イオン交換樹脂
カチオン交換樹脂:Dow 650C,充填量 300mL
アニオン交換樹脂:Dow 550A,充填量 600mL
再生液は次の通りである。
HCl水溶液:HCl濃度5重量%,通水流量:1L/h、30分
NaOH水溶液:NaOH濃度5重量%,通水流量:2L/h、加温40℃、30分
再生液は、次のように通液した。
30分(薬品通液時間)→30分超純水通水(薬品押出時間)→15分原水通水(運転切り換え時間)
RO装置の主な条件は次の通りである。
RO膜 : ES-20-D(日東電工社)
RO運転条件 : 回収率75%
RO処理水Mg濃度 : 1mg/L
Na濃度 : 1mg/L
模擬原水は、超純水にMgCl2を60mg/L-asCa、NaClを50mg/L-asNaそれぞれ溶解させ、膜脱気により脱気して調製したものである。使用した脱気膜はLiqui-Cel DX-50(セルガード社)である。
その結果、表4の通り、再生後通水1Hr後の処理水中のNa濃度は1ppt(ng/L)以下であった。通水開始から360時間の間の処理水のNa濃度を図3に示す。
模擬原水をRO装置に通水することなく直接にイオン交換装置に通水したこと以外は実施例2と同様にして模擬原水を処理した。
実施例2において、模擬原水をRO装置に通水した後、まずカチオン交換樹脂に通水し、次いでアニオン交換樹脂に通水した。即ち、アニオン交換樹脂とカチオン交換樹脂との通水順序を実施例2と逆にした。これ以外は実施例2と同様にして通水した。その結果、表4の通り、再生後通水時1Hr後の処理水中のNa濃度は3pptであり、実施例2の数倍以上の濃度であることが認められた。通水開始から360時間の間の処理水のNa濃度を図3に示す。
実施例2に用いたアニオン交換樹脂とカチオン交換樹脂とを実施例2と同量ずつ用い、且つこれを混合して混床としたこと、及び再生時の通水フローを下記の通りとしたこと以外は実施例2と同一条件にて通水を行った。その結果、表4の通り、再生後通水1Hr後の処理水中のNa濃度は52pptであった。通水開始から360時間の間の処理水のNa濃度を図3に示す。
20分超純水を0.3L/minにて上向流で通水(樹脂分離時間)→(30分(薬品(HCl)通液)→30分超純水通水(薬品押出))→(30分(薬品(HCl)通液)→30分超純水通水(薬品押出))→15分超純水通水(樹脂混合)→30分(運転切り換え時間)
表4及び図3の通り、本発明によると高水質の処理水を安定して生産することが可能である。
なお、本出願は、2009年9月30日付で出願された日本特許出願(特願2009-227453)及び2010年3月16日付で出願された日本特許出願(特願2010-059390)に基づいており、その全体が引用により援用される。
1b,1c 鏡板
2 仕切板
3 上部給排配管
4,6,9,14 集配水部材
5,8,11 連通配管
13 下部給排配管
20 上室
30 下室
41 硬度成分除去手段
42 イオン交換装置
Claims (7)
- 内部にイオン交換樹脂が充填されるイオン交換装置用塔体において、
該塔体内に遮水性の仕切板によって上室と下室とが区画形成されており、
該塔体外を引き回された連通手段によって該上室と下室とが連通されていることを特徴とするイオン交換装置用塔体。 - 請求項1のイオン交換装置用塔体と、
該塔体の上室及び下室のうち一方に収容されたカチオン交換樹脂と、
他方に収容されたアニオン交換樹脂とを備えてなるイオン交換装置。 - 請求項2において、
前記上室の上部に液を供給又は排出するための上部給排配管と、
該下室の下部に液を供給又は排出するための下部給排配管と、
を備えており、前記連通手段は、
該上室の下部に液を給排するための第1の連通配管と、
該下室の上部に液を給排するための第2の連通配管と、
該第1の連通配管と第2の連通配管とを連通する第3の連通配管と、
該第3の連通配管の開閉手段と、
該第1の連通配管及び第2の連通配管にそれぞれ設けられた再生液の給排手段と
を備えたことを特徴とするイオン交換装置。 - 請求項3において、前記上室の上部、上室の下部、下室の上部及び下室の下部にそれぞれ、水は通すがイオン交換樹脂の通過を阻止する集配水部材が配置されており、
前記上部給排配管、第1の連通配管、第2の連通配管及び下部給排配管の末端がそれぞれ該集配水部材に接続されていることを特徴とするイオン交換装置。 - 請求項4において、前記上室の上部及び下室の上部にそれぞれ粒状の不活性樹脂が充填されており、上室上部の集配水部材及び下室下部の集配水部材がそれぞれ該不活性樹脂中に埋設されていることを特徴とするイオン交換装置。
- 請求項2ないし5のいずれか1項に記載のイオン交換装置と、該イオン交換装置の前段に設けられた硬度成分除去手段とを有することを特徴とする水処理装置。
- 請求項6において、前記イオン交換装置は、被処理水が先にアニオン交換樹脂と接触し、その後カチオン交換樹脂と接触するよう構成されていることを特徴とする水処理装置。
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JP2012205994A (ja) * | 2011-03-29 | 2012-10-25 | Kurita Water Ind Ltd | イオン交換装置 |
JP2012205989A (ja) * | 2011-03-29 | 2012-10-25 | Kurita Water Ind Ltd | 純水製造装置 |
CN108249519A (zh) * | 2018-04-17 | 2018-07-06 | 袁龙 | 软化除碱离子交换器 |
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JP2013233531A (ja) * | 2012-05-11 | 2013-11-21 | Japan Organo Co Ltd | 復水脱塩装置および復水脱塩方法 |
JP5999400B1 (ja) * | 2016-03-18 | 2016-09-28 | 栗田工業株式会社 | イオン交換装置及びその使用方法 |
JP6337933B2 (ja) * | 2016-09-16 | 2018-06-06 | 栗田工業株式会社 | 水質管理システム及び水質管理システムの運転方法 |
CN115465919B (zh) * | 2022-10-25 | 2023-09-08 | 江苏源邦环境科技有限公司 | 一种复合式离子交换装置 |
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JPH1094784A (ja) * | 1996-09-24 | 1998-04-14 | Kurita Water Ind Ltd | 復水処理装置 |
JPH10137751A (ja) * | 1996-11-07 | 1998-05-26 | Japan Organo Co Ltd | イオン交換方法及びこのイオン交換方法に用いられるイオン交換塔 |
JP2001205263A (ja) * | 2000-01-27 | 2001-07-31 | Japan Organo Co Ltd | 複床式イオン交換装置 |
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JP5053940B2 (ja) * | 2007-08-21 | 2012-10-24 | 旭化成ケミカルズ株式会社 | 廃水処理方法及び廃水処理装置 |
CN201141002Y (zh) * | 2007-11-19 | 2008-10-29 | 湖南利多环保科技发展有限公司 | 污水循环处理设备 |
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JPH1094784A (ja) * | 1996-09-24 | 1998-04-14 | Kurita Water Ind Ltd | 復水処理装置 |
JPH10137751A (ja) * | 1996-11-07 | 1998-05-26 | Japan Organo Co Ltd | イオン交換方法及びこのイオン交換方法に用いられるイオン交換塔 |
JP2001205263A (ja) * | 2000-01-27 | 2001-07-31 | Japan Organo Co Ltd | 複床式イオン交換装置 |
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JP2012205994A (ja) * | 2011-03-29 | 2012-10-25 | Kurita Water Ind Ltd | イオン交換装置 |
JP2012205989A (ja) * | 2011-03-29 | 2012-10-25 | Kurita Water Ind Ltd | 純水製造装置 |
CN108249519A (zh) * | 2018-04-17 | 2018-07-06 | 袁龙 | 软化除碱离子交换器 |
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TW201130561A (en) | 2011-09-16 |
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