JPH0957116A - Countercurrent regeneration type ion exchange apparatus and regeneration thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a problem such as the extension of a regeneration time and an increase in the regeneration amt. of a waste fluid by providing a pair of water collecting and distributing devices to the upper and lower parts of a resin column and providing an ion exchange resin packed part to the upper part of the lower water collecting and distributing device and further arranging a packed part of an inert resin having a particle size larger than that of the ion exchange resin. SOLUTION: A pair of water collecting and distributing devices 2, 3 are provided to the upper and lower parts of a resin column 1 and the upper part of the lower water collecting and distributing device 2 is packed with an ion exchange resin 4 and the upper part of the ion exchange resin 4 is firther packed with an inert resin 6. At a time of regeneration, a backwashing water inflow valve 10 and a regenerated waste water outflow valve 8 are opened and the ion exchange resin 4 is pressed to the inert resin bed 6 by the high speed backwashing from the lower water collecting and distributing device 2 to discharge and remove a suspended substance and the fixed bed of the ion exchange resin 4 is formed. Next, a regeneration agent is passed before treated water is passed. Subsequently, a regeneration agent inflow valve 11 and the regenerated waste water outflow valve are closed to allow the regenerated resin to fall and settle. Thereafter, a raw water inflow valve 7 and a backwashing valve 12 are opened and raw water is passed from the upper water collecting and distributing device 2 to wash the resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ion exchange apparatus, and more particularly, to a countercurrent regeneration ion exchange apparatus such as a deionized water apparatus for performing descending circulating water and ascending circulating medicine and a regeneration method thereof.

[0002]

2. Description of the Related Art Recent ion exchangers often employ a countercurrent regeneration system because they can save a regenerant and can obtain good treated water quality. In the case of a pure water system, depending on the raw water quality, a weak electrolyte type ion exchange resin and a strong electrolyte type ion exchange resin are used as a multi-layer bed, and water is passed from the weak electrolyte type ion exchange resin to the strong electrolyte type ion exchange resin. If the replenishment is carried out from the strong electrolyte type ion exchange resin to the weak electrolyte type ion exchange resin, the regenerant can be further saved. Countercurrent regeneration is roughly divided into those that perform downward circulating water and upward circulating drugs, and those that perform upward circulating water and downward circulating drugs. In order to exert the features of the countercurrent regeneration type in any method, during upflow operation, that is, during downflow water / upflow drug, during
It is necessary to maintain the ion-exchange resin layer on the fixed bed when passing water for ascending flowing water and descending flowing medicine.

[0003] The ascending and descending flow medicines are likely to disturb the ion exchange resin layer due to the interruption of the water flow, and the quality of the treated water is apt to deteriorate, and a special operation is performed for discharging the suspended substances accumulated in the ion exchange resin layer during the water flow. On the other hand, in the case of falling circulation water and rising circulation medicine, water quality will not deteriorate due to interruption of water passage, and the fixed bed can be maintained only during the passage of medicine when operation is completed in a short time.
There are many examples of adoption. In addition, in a multi-layer bed using a weak electrolyte type ion exchange resin and a strong electrolyte type ion exchange resin, the weak electrolyte type ion exchange resin has a smaller specific gravity,
In the downward flow regeneration, the multi-layer bed cannot be applied without physically partitioning the inside of the resin tower, whereas in the downward flow water / upflow drug, the two layers can be separated due to the difference in specific gravity without physical partition. There is. The present invention has a wide range of applications
The present invention relates to an improvement of a countercurrent regeneration type ion exchange device that performs upward flow medicine.

In the countercurrent regeneration type ion exchange apparatus for performing descending circulating water and ascending circulating medicine, the biggest point of development is how to maintain the ion exchange resin layer on the fixed bed during the ascending circulating medicine. Various methods have been devised, but the principle is
A method in which a physical device is placed above the ion-exchange resin layer and the lower ion-exchange resin layer is pressed from this device to maintain a fixed bed, and the resin tower is filled with ion-exchange resin to maintain a fixed bed. There are two main methods. Among these methods, a method in which an intermediate water collecting pipe is embedded in the upper part of the ion exchange resin layer, and water or air is introduced from the upper part and the water is discharged from the intermediate water collecting pipe together with the regenerated waste liquid is widely put into practical use. There is also proposed a method in which a part of the ion exchange resin is replaced with an inert resin having a specific gravity of 1 or less.

Ion exchange resins tend to contract when they come into contact with regenerants, especially when regenerating weak electrolyte type ion exchange resins. When the ion exchange resin contracts during the ascending flow drug, a part of the ion exchange resin layer is fluidized and the ion exchange zone is disturbed, resulting in deterioration of treated water quality. Therefore, in order to actually obtain satisfactory results with up-market drugs, further efforts are needed. In the conventional method, as a method of preventing fluidization due to contraction of the ion exchange resin, a method of interrupting the medicine in the middle of the medicine, resuming the medicine after calming the contracted ion exchange resin is repeated several times, By using a low concentration regenerant, the method of reducing the effect of shrinkage, the method of increasing the amount of water or air introduced from the top, heating the regenerant of the cation exchange resin to lower the viscosity of the regenerant. There are ways to go to medicine. Although fluidization of the ion-exchange resin layer can be prevented by these methods, the disadvantages of extending the regeneration time due to the complicated regeneration operation, increasing the amount of waste liquid to be recycled, increasing the cost of recycling, complicating the equipment itself, etc. Occurs.

In the countercurrent regeneration type ion exchange apparatus, when backwashing is carried out, the ion exchange zone is disturbed and the effect of countercurrent regeneration is lost, so the discharge of the suspended substances accumulated in the ion exchange resin layer during the passage of water is How to do it is an important point of development. When the intermediate water collecting pipe is installed, the resin above the intermediate water collecting pipe can be backwashed each time, but the resin below the intermediate water collecting pipe is not backwashed by normal regeneration. However, accumulation of suspended matter and adhesion of resin particles occur if left as it is, so that it is necessary to backwash the entire layer of the ion-exchange resin from the lower portion at a rate of about once every 10 regenerations. When all layers of the ion-exchange resin are backwashed, the ion-exchange zone is disturbed, so that a regenerant amount of 2 to 3 times that of normal regeneration is required.

In the case of full packing, a special operation is required to transfer a part of the packed resin to another column at a rate of about once every 10 regenerations. In this case as well, the ion exchange zone is disturbed, so that a regenerant amount of 2 to 3 times that of normal regeneration is required. In addition, it is necessary to install a separate tower, which makes the regeneration operation complicated.
In a countercurrent regeneration type deionized water device that performs downward flow water and upward flow chemicals, the weak electrolyte type ion exchange resin and strong electrolyte type ion exchange resin have different specific gravities, so there is no physical partition in the resin tower It can be used as a floor. However, this difference in specific gravity is only when both resins are regenerated, and when the ions are loaded, the difference in specific gravity disappears. Therefore, in actuality, considerable mixing occurs due to swelling / shrinking of the resin due to regeneration, improper backwashing, etc., and the performance as a multi-layer bed cannot be exhibited,
Many devices have troubles such as deterioration of treated water quality and shortage of sampled water. Therefore, in the multi-layer type, maintaining the separation of both resins is also an important point for development.

[0008]

DISCLOSURE OF THE INVENTION The present invention has the disadvantages of the conventional countercurrent regeneration type ion exchange apparatus for performing descending circulating water and ascending circulating medicine, namely, extension of the regeneration time, increase of the amount of regeneration waste liquid, and regeneration cost. Increased, problems caused by backwashing, strong
A simple and compact ion exchange device that solves the problems of mixing weak resins and complicating the device and regeneration operation all at once.
It is an object of the present invention to provide a simple and short-time reproduction method for the device.

[0009]

In order to solve the above problems, according to the present invention, a countercurrent regeneration ion exchange apparatus for performing descending flow water and ascending flow medicine in a resin tower filled with an ion exchange resin is used. A pair of water collecting and distributing devices are installed in the upper and lower parts of the lower part of the lower water collecting and distributing device. In addition, a filling section filled with an inert resin having a size capable of holding the ion exchange resin and having a specific gravity of less than 1 is provided, and an upper water collecting and distributing apparatus is arranged above it, and the treated water flows out to the lower water collecting and distributing apparatus. Valve, backwash water inflow valve, regenerant inflow valve, and a water collection and distribution pipe with a washing valve were connected, and the upper water collection and distribution system was connected with a raw water inflow valve and a water collection and distribution pipe with a regeneration drainage outflow valve. It is a thing.

In the above apparatus, the freeboard portion is preferably 2 to 15% of the maximum bed height of the ion exchange resin filling portion, and the inert resin filling portion is 2 times the effective diameter of the ion exchange resin. A layer height of 100 to 300 mm may be obtained using an inert resin having a particle size of ˜8 times. The ion exchange apparatus of the present invention can be used as a cation tower and anion tower of a deionized water apparatus, and the ion exchange resin filling part at this time is a strong acid cation exchange resin single bed, a weak acid cation exchange resin and a strong acid cation exchange resin. It can be packed with either a multiple bed of resin, a single bed of a strongly basic anion exchange resin, or a multiple bed of a weakly basic anion exchange resin and a strongly basic anion exchange resin.

Further, in the present invention, in the regeneration method of the countercurrent regeneration type ion exchange apparatus, the resin is regenerated by sequentially performing the following steps (a) to (e). (A), Most of the ion-exchange resin is pressed against the inert resin layer by high-speed backwash from the lower water collection and distribution device, and suspended substances accumulated during water passage are passed from the upper water collection and distribution device through the inert resin layer. A step of forming a fixed bed of ion-exchange resin while discharging and removing, and (b) subsequent to high-speed backwashing, required at a lower speed than high-speed backwashing and to maintain the fixed bed formed in step (a) above A step of passing the regenerant from the lower water collecting and distributing device at a flow rate, (c), followed by passing the treated water through the lower water collecting and distributing device at substantially the same flow rate as in the flowing step (b), and remaining regeneration Extrusion step of extruding the agent, (d), after the completion of extrusion,
A sedation step in which water flow is stopped and the regenerated resin is allowed to fall freely, (e), a washing step in which water is passed in a downward flow from the upper water collecting and distributing device to wash the resin.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to FIG. 1 showing an embodiment of the present invention. In FIG.
A pair of water collecting and distributing devices 2 and 3 are provided above and below the resin tower 1, and the upper part of the lower water collecting and distributing device 2 is filled with the ion exchange resin 4, and the upper part of the water collecting and distributing device 2 is covered with the ion exchange resin via some free boards 5. An inert resin 6 having a large particle size and a size capable of holding the ion exchange resin and having a specific gravity of less than 1 is filled. The lower water collecting and distributing device has a treated water outflow valve 9, a backwash water inflow valve 10,
A regenerant inflow valve 11 and a washing valve 12 are connected, and a raw water inflow valve 7 and a regeneration drainage outflow valve 8 are connected to the upper water collecting and distributing device 3. In the resin tower of the present invention, pipes connected to the tower
There are few valves and interior parts, and the amount of freeboard is as low as 2 to 15% of the height of the ion exchange resin layer. It is a simple and compact device even considering the filling with inert resin. On the other hand, a resin tower of the type having an intermediate water collecting pipe needs to have a backwashing freeboard of 50 to 100% of the height of the ion exchange resin layer, and a resin tower of the type filling up does not have a freeboard, The conventional device has a complicated structure and piping, such as having to have a backwash tower separately, and is not compact.

At the time of regeneration, (a) the backwash water inflow valve 10 and the regeneration drainage outflow valve 8 are opened, and the ion exchange resin 4 is subjected to high-speed backwash from the lower water collecting and distributing device 2.
Most of the water is pressed against the inert resin layer 6, and the suspended substance accumulated during water passage is passed through the inert resin layer to the upper water collecting and distributing device 3
High-speed backwashing step of discharging and removing from the water and forming a fixed bed of the ion exchange resin 4 (b) Following high-speed backwashing, the backwash water inflow valve 10 is closed
(C) a step of flowing the regenerant from the lower water collecting and distributing device 2 at a lower speed than the high-speed backwash by opening the regenerant inflow valve 11 and at a flow rate required to maintain the fixed bed formed in (a). Extruding process in which treated water is passed from the lower water collecting / distributing device 2 at a flow rate substantially the same as that in the drug passing process and the remaining regenerant is extruded (d) After completion of the extruding, the regenerant inflow valve 11 and the reclaimed drainage water A sedation process in which the outflow valve 8 is closed, the extrusion is stopped, and the regenerated resin is allowed to fall freely. (E) The raw water inflow valve 7 and the washing valve 12 are opened, and raw water is passed from the upper water collecting and distributing device 2 in a downward flow. The resin is regenerated by the five washing steps of washing the resin.

The high-speed backwash in the step (a) is unique to the present invention, and while substantially maintaining the fixed bed of the ion exchange resin,
Move to the top in a short time. The backwash flow rate required at this time varies depending on the type of ion exchange resin, the ratio of freeboard, and the like. As an example, in the case of 10% freeboard, it is necessary to have a strong electrolyte type cation exchange resin of about 25 m / h or more and a strong electrolyte type anion exchange resin of about 15 m / h or more. If the backwash flow rate is less than this, the ratio of the lower part of the ion exchange resin layer to the fluidized bed increases. If the rate of maintenance as a fixed bed decreases, the effect of countercurrent regeneration will not be fully exerted and the quality of treated water will deteriorate. In the present invention, the selection of the proportion of the freeboard is important, and if it is too small, it may not be possible to absorb the swelling of the resin, and if it is too large, the lower part of the ion exchange resin layer in the high-speed backwash step is the fluidized bed. The risk of deterioration of treated water quality increases. As a freeboard, the maximum bed height of ion exchange resin is 2 to 15
The appropriate value is%. The water used for the high-speed backwash may be raw water, but it is preferable to use the treated water because it gives unnecessary ion load to the lower part of the ion exchange resin layer and deteriorates the quality of the treated water.

In the present invention, step (a) has an important role in addition to forming a fixed bed of ion exchange resin.
That is, the high-speed backwash moves the ion-exchange resin layer upwards,
Due to the impact of hitting the inert resin layer and stopping, the suspended solids that accumulated on the surface of the ion exchange resin layer during water flow dislodged from the ion exchange resin layer and were discharged at a high concentration from the upper water collection and distribution device via the inert resin layer. To be removed. Compared with the conventional backwashing which requires about 10 to 20 minutes for discharging the suspended solids, the present invention discharges the suspended solids by a completely different principle from the conventional backwashing, so It will be completed in an extremely short time of about 3 minutes. Further, in the present invention, since high-speed backwashing is performed every regeneration, accumulation of suspended substances is unlikely to occur. In the present invention, it is important to select the particle size of the inert resin, and if the particle size is too fine, the discharge and removal of the suspended matter tends to be insufficient, and if it is too large, there is a risk of leaking the ion exchange resin or clogging of the upper water collecting and distributing device. Occurs. The particle size of the inert resin should be 2 to 8 times the effective diameter of the ion exchange resin. A suitable height of the inert resin layer is 100 to 300 mm.

The fixed bed once formed by the high-speed backwash in step (a) can maintain the fixed bed even if the backwash flow rate is reduced. In the present invention, by maintaining the fixed bed and the contact time of the ion-exchange resin and the regenerant at the same time, it is attempted to carry out the passage in the step (b) at a flow rate of the flow rate which is higher than the minimum necessary to maintain the fixed bed. An example of the maximum flow rate of the drug that can be maintained in the fixed bed is about 8 m / h or more for the strong electrolyte type cation exchange resin and about 4 m / h or more for the strong electrolyte type anion exchange resin. Even in the present invention, contraction of the ion exchange resin occurs during the commuting, but since the comminution flow rate is equal to or higher than the limit flow rate at which the fixed bed can be maintained, no fluidized bed is generated due to the contraction, and the lower end of the fixed bed contracts. Move up by the amount you did. That is, "preventing the formation of a fluidized bed due to the contraction of the ion-exchange resin during the passage of medicine", which requires a great deal of devise in the conventional method, is different from the high-speed backwash in the step (a) and the subsequent step (b) in the present invention. ) Is achieved only by a simple operation of passing a drug at a flow rate above the minimum required to maintain a fixed bed. The extrusion of step (c) is not different from the conventional method, but the sedation of step (d) is unique to the present invention. That is, in the extrusion step, the ion-exchange resin layer is pressed against the inert resin layer to form a fixed bed, but when the extrusion is stopped, the ion-exchange resin layer collapses sequentially from the lower part of the fixed bed and is laminated on the lower water collecting and distributing device. Since the newly formed fixed bed almost maintains the ion exchange zone after regeneration, the quality of treated water does not deteriorate during water passage.

In the present invention, all the layers of the ion-exchange resin are loosened by this step every time they are regenerated, and sticking and the like are eliminated. Therefore, it is extremely difficult to increase the differential pressure of the ion-exchange resin layer. Suspended substances that have entered the ion-exchange resin layer, debris generated by crushing of the ion-exchange resin, etc. are transferred from the lower part of the fixed bed to the upper part of the resin tower in the process of the sequential collapse of the ion-exchange resin layer. It also has the effect of increasing the probability of being discharged to the outside. As a similar effect, in a multi-layer bed using a weak electrolyte type ion exchange resin and a strong electrolyte type ion exchange resin, a sedation process is reached after a regeneration type in which a difference in specific gravity between the two resins occurs The exchange resin is easily transferred above the resin tower, and the progress of mixing of both resins can be prevented. The washing in step (e) is not different from the conventional method, but the time required for washing is short because the number of free boards is small and the adhesion of the ion exchange resin layer is eliminated in step (d). There is a tendency that the amount of water required for water consumption decreases.

[0018]

The present invention will be described below in more detail with reference to examples. Example 1 A strongly acidic cation exchange resin Dowex HGR-W2 (effective diameter 0.
62 mm) is filled in H shape with a layer height of 1640 mm, and an inert resin Dowex IF-62 (diameter 2.5 to 3.5 is placed on top of it).
mm) to 200 mm. Free board is 110m
It corresponds to 6.7% of the height of the ion exchange resin layer in m. To this resin tower, raw water having the ionic composition shown in Table 1 was added with 1 mg / liter of kaolin aggregated with polyaluminum chloride as a suspension substance, and the raw water was passed at 80 liter / h for 20 hours. Reproduction was performed under the reproduction conditions shown in. Amount of cationic resin: 4.2 liters (standard type) Regeneration level: 71.5 g-HCl / liter

[0019]

[Table 1]

[0020]

[Table 2] Table 3 shows the results of repeating 40 cycles of water flow and regeneration under these conditions. Despite the short medication time of 14 minutes, 4
Even at the 0th cycle, the cation tower did not break and the water quality was good. Removal of suspended solids during regeneration was low in the first cycle, but then increased to almost 100%. The differential pressure at the start of water flow did not tend to increase even after repeated cycles.

[0021]

[Table 3] * Treated water quality indicates the value at the anion tower outlet.

Example 2 A strongly acidic cation exchange resin Dowex HGR-W2 (effective diameter: 0.
62 mm) is H type, layer height is 1015 mm, weakly acidic cation exchange resin Dowex MAC-3 (effective diameter 0.53 m)
m) was filled with H type in a layer height of 625 mm, and 200 mm of an inert resin Dowex IF-62 (diameter 2.5 to 3.5 mm) was filled thereon. The freeboard is 110 mm, which corresponds to 6.7% of the height of the ion exchange resin layer. Raw water having the ionic composition shown in Table 4 was passed through this resin tower at a rate of 60 liters / h to a cation break (end point 10 μS / cm), and after the passage of water, the raw water was regenerated under the regeneration conditions shown in Table 5. Strong cation resin amount: 2.6 liters (standard type) Weak cation resin amount: 1.6 liters (standard type) Regeneration level: 122.3 g-HCl / liter-strong resin

[0023]

[Table 4]

[0024]

[Table 5] Table 6 shows the results of repeating 40 cycles of water flow and regeneration under these conditions. Despite the short medication time of 15 minutes, 4
The treated water quality of the cation tower was good even at the 0th cycle. The amount of water collected is almost constant at around 1170 liters,
The regeneration efficiency was as good as almost 90%. In addition, the separated state of the strong cation resin and the weak cation resin was kept good even after 40 cycles.

[0025]

[Table 6] * Treated water quality shows the value at the anion tower outlet before cation break.

Example 3 A resin column having an inner diameter of 300 mm and a height of 1020 mm was filled with a strongly acidic cation exchange resin Dowex HGR-W2 (effective diameter 0.62 mm) in an H shape at a layer height of 820 mm, and an inert resin Dow was placed thereon. X-IF-62 (diameter 2.5-3.
5 mm) was filled to 150 mm. 50m freeboard
It corresponds to 6.1% of the height of the ion exchange resin layer in m. 14 mg / g powdered ion-exchange resin as a suspended substance in this resin tower
Liter, pure water containing 1 mg / liter of kaolin was passed at 1200 liters / h for 1 hour, and after washing, backwash L
High-speed backwash was performed for 2 minutes at V = 25 m / h. Table 7 shows the results of repeating 10 cycles of water passing and high-speed backwash under these conditions.
FIG. 2 shows an example of changes in the concentration of suspended substances in backwash wastewater. Although the differential pressure increased considerably at the end of water flow, suspended substances were almost removed by high-speed backwash, and the differential pressure at the start of water flow returned to the original value. The backwash drainage amount was 60 liters, and the concentration of suspended substances in the backwash drainage was the highest 15 to 30 seconds after the start of high-speed backwash, and the value was extremely high at 3000 mg / liter or more. The concentration of suspended solids in the backwash wastewater rapidly decreased thereafter, and after 2 minutes, became 10 mg / liter or less.

[0027]

[Table 7]

Comparative Example 1 A strong acid cation exchange resin Dowex HGR-W2 (effective diameter 0.62 mm) was packed in a resin tower having an inner diameter of 300 mm and a height of 1020 mm in an H shape with a bed height of 520 mm. The freeboard is 500 mm and corresponds to 96% of the height of the ion exchange resin layer. Pure water containing 14 mg / liter of powdered ion exchange resin and 1 mg / liter of kaolin as a suspended substance was passed through this resin tower at 1200 liter / h for 1 hour, and after washing, backwash was performed at LV = 15 m / h. Normal backwash was performed for 10 minutes. Table 8 shows the results of repeating 10 cycles of water passage and normal backwash under these conditions, and Fig. 3 shows an example of changes in the concentration of suspended substances in the backwash wastewater. Usually, the suspended matter was almost removed by backwashing, and the pressure difference at the start of water flow returned to the original value. The backwash drainage amount was 180 liters, and the concentration of suspended substances in the backwash drainage reached the maximum value in 2 to 3 minutes after the start of the backwash, but it was one digit lower than that in Example 3, and the decrease thereafter was slow. Even after 10 minutes, it did not completely decrease to about 50 mg / liter.

[0029]

[Table 8]

[0030]

EFFECTS OF THE INVENTION According to the present invention, the disadvantages of the conventional countercurrent regeneration type ion exchange apparatus for performing descending circulating water / updraft medicine, namely, extension of regeneration time, increase of the amount of waste liquid for regeneration, increase of regeneration cost, reverse It is possible to solve various problems associated with washing, mixing strong and weak resins, and complicating equipment and regeneration operations. as a result,
A simple and compact ion exchange device and a simple and short-term regeneration method can be provided, and good treated water quality can be obtained inexpensively and stably.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an ion exchange column showing an example of an embodiment of the present invention.

FIG. 2 is a graph showing changes over time in the concentration of suspended substances in backwash wastewater in Example 3.

FIG. 3 is a graph showing changes over time in the concentration of suspended substances in backwash wastewater in Comparative Example 1.

[Explanation of symbols]

1: Resin tower, 2: Lower water collecting and distributing device, 3: Upper water collecting and distributing device, 4: Ion exchange resin, 5: Free board, 6: Inert resin, 7: Raw water inflow valve, 8: Regeneration drainage outflow valve, 9 : Treated water outflow valve, 10: Backwash water inflow valve, 11: Regenerant inflow valve, 12: Washing valve,

Claims (6)

[Claims] 1. A countercurrent regeneration ion exchange apparatus for performing descending flow water and ascending flow medicine in a resin tower filled with ion exchange resin, wherein a pair of water collecting and distributing devices are provided above and below the resin tower, and a lower water collecting and distributing apparatus is provided. An ion-exchange resin is filled in the upper part of the device, and a freeboard part is further provided on the upper part of the device so that the particle size is larger than that of the ion-exchange resin, the ion-exchange resin can be held, and the specific gravity is less than 1. A filling part filled with an inert resin is provided, and an upper water collecting and distributing device is arranged on the upper part thereof, and a treated water outflow valve, a backwash water inflow valve, a regenerant inflow valve and a cleaning valve are provided in the lower water collecting and distributing device. A countercurrent regenerative ion exchange device, characterized in that a water collection and distribution pipe is provided and a water collection and distribution pipe having a raw water inflow valve and a regeneration drainage outflow valve is connected to the upper water collection and distribution device. 2. The countercurrent regeneration ion exchange device according to claim 1, wherein the freeboard portion is 2 to 15% of the maximum bed height of the portion filled with the ion exchange resin. 3. The inert resin filling portion is made of an inert resin having a particle diameter of 2 to 8 times the effective diameter of the ion exchange resin, and has a layer height of 100 to 300 mm. The countercurrent regeneration ion exchange device according to 1 or 2. 4. The ion exchange device is a cation tower or anion tower of a pure water device,
The countercurrent regeneration ion exchange device according to 2 or 3. 5. The packed portion of the ion exchange resin used in the ion exchange apparatus is a single bed of strong acid cation exchange resin, a multi-layer bed of weak acid cation exchange resin and strong acid cation exchange resin,
5. The countercurrent regeneration ion exchange apparatus according to claim 4, wherein either the single bed of the strongly basic anion exchange resin or the multiple bed of the weakly basic anion exchange resin and the strongly basic anion exchange resin is packed. . 6. The method for regenerating a countercurrent regeneration ion exchange apparatus according to claim 1, wherein the resin is regenerated by sequentially performing the following steps (a) to (e). Method for regenerating a countercurrent regeneration ion exchange device. (A), Most of the ion-exchange resin is pressed against the inert resin layer by high-speed backwash from the lower water collection and distribution device, and suspended substances accumulated during water passage are passed from the upper water collection and distribution device through the inert resin layer. A step of forming a fixed bed of ion-exchange resin while discharging and removing, and (b) subsequent to high-speed backwashing, required at a lower speed than high-speed backwashing and to maintain the fixed bed formed in step (a) above A step of passing the regenerant from the lower water collecting and distributing device at a flow rate, (c), followed by passing the treated water through the lower water collecting and distributing device at substantially the same flow rate as in the flowing step (b), and remaining regeneration Extrusion step of extruding the agent, (d), after the completion of extrusion,
A sedation step in which water flow is stopped and the regenerated resin is allowed to fall freely, (e), a washing step in which water is passed in a downward flow from the upper water collecting and distributing device to wash the resin.