JPH0366020B2 - - Google Patents

Description

Detailed Description of the Invention The present invention performs ion exchange treatment by passing liquid in an upward flow through an ion exchange resin bed in a tank, and passes regenerated liquid in a downward flow through an ion exchange resin bed whose capacity has decreased. The present invention relates to a countercurrent regeneration type ion exchange device that performs regeneration. Hereinafter, the general concept of liquid involved in ion exchange processing may be explained as water, which is a subordinate concept.

In this type of ion exchange equipment, the upper part of the ion exchange resin bed is well regenerated by the downward flow regeneration, and the upper part that first encounters the new regenerating liquid is completely regenerated, and this upper part is regenerated when the water flows upward. Since this is the outflow end of treated water, highly purified treated water can be obtained.

Therefore, there is an advantage that it is not necessary to use a large amount of regenerant liquid to increase the regeneration level in order to obtain treated water of the desired high purity. However, when water flows upward, the ion exchange resin tends to rise and become fluidized. Conventionally, as a measure to prevent this fluidization, a treated water collector is buried near the top surface of the ion exchange resin bed. Fluidization is suppressed by placing excess ion exchange resin or other fillers on top of the tank, or by passing treated water in a downward flow from the top of the tank. These measures have drawbacks such as a decrease in the utilization efficiency of the ion exchange resin and wasteful power consumption due to the downward flow.

The present invention has been made to solve the above problem, and the ion exchange tank is divided into an upper chamber and a lower chamber by a partition wall provided with communicating holes for upward flow and downward flow. The lower chamber is filled with ion-exchange resin to form a bed, and an opening/closing lid with a higher specific gravity than the liquid is rotatably attached to the upper side of the communication hole for upward flow, and a lower cover is attached to the communication hole for downward flow. An opening/closing lid with a lower specific gravity than the liquid is rotatably attached to the side, and due to the difference in specific gravity and the flow relationship, the communication hole for upward flow is kept closed during upward flow ion exchange, and the ion exchange resin bed is kept closed at the bottom. It is kept tightly in the room, but opens when the upward flow of pollutants accumulated on the floor is washed, allowing the ion exchange resin to migrate to the upper chamber, and the communication hole for downward flow is opened by the downward flow. The ion exchange resin transferred to the upper chamber is returned to the lower chamber and the ion exchange resin is regenerated in a downward flow.

In other words, the countercurrent regeneration type ion exchange apparatus of the present invention is configured to perform ion exchange by passing the fluid to be treated in an upward flow through a bed of granular ion exchange resin formed at the bottom of a vertical closed tank. In the countercurrent regeneration type ion exchange treatment method, which regenerates by passing the regenerating liquid in a downward flow through the ion exchange resin bed whose treatment capacity has decreased, A treated water collector is installed at a small distance from the bottom of the partition wall, and an opening/closing lid with a higher specific gravity than the liquid is rotatably attached to the partition wall above the communication hole for upward flow. It is characterized in that an opening/closing lid having a specific gravity smaller than that of the liquid is rotatably attached to the partition wall below the flow communication hole.

Hereinafter, the present invention will be explained specifically and in detail with reference to embodiments shown in the accompanying drawings.

In the apparatus of the present invention shown in FIG. 1, an ion exchange treatment tank 1 is of a vertically long closed type and has an upper nozzle 2, a lower nozzle 3, and a side nozzle 4 for external connection. The upper nozzle 2 serves as an inlet for regenerating agent liquid and an outlet for cleaning waste water, the lower nozzle 3 serves as an inlet for raw water and washing water, and an outlet for regenerating waste water, and the side nozzle 4 serves as an outlet for treated water.

The inside of the tank 1 is divided into an upper chamber 6 and a lower chamber 7 by a horizontal transverse partition wall 5 of intermediate height, and the partition wall 4 has communication holes 8 of relatively small diameter for upward flow and relatively large diameter communicating holes 8 which are distributed and opened. It has a communication hole 9 for downward flow. A water collector 10 connected to the side nozzle 4 is provided along the lower surface of the partition wall 5 at a small interval therebetween. A supporting plate 12 is provided at the bottom of the tank with strainers 11 arranged in a distributed manner to provide water permeability, and ion exchange is performed by filling granular ion exchange resin onto the supporting plate 12 to a height that extends substantially to the water collector 10. A resin bed 13 is formed.

As shown in more detail in FIG. 2, the upward flow communication hole 8 of the partition wall 5 has an opening/closing lid 14 made of corrosion-resistant metal, porcelain, metal-filled resin, etc., which has a higher specific gravity than the processing liquid, above the partition wall. It is attached with a hinge so that it can be opened and closed freely. The opening/closing lid 14 is in line contact with the upper edge of the upward flow communication hole 8 at its inclined surface 14a, so that the ion exchange resin is not caught between the contact surfaces when closing. Further, below the downward flow communication hole 9, an opening/closing cover 15 made of polypropylene, polyethylene, etc. having a specific gravity smaller than that of the liquid is rotatably attached to the partition wall 5 by a hinge. These opening/closing lids are set to open at a liquid flow rate above a certain level so that the ion exchange resin passes through with the liquid flow.

The apparatus according to the present invention having the above configuration is operated as follows.

() Normal ion exchange treatment operation: Close the upper nozzle 2, open the side nozzle 4,
The lower nozzle 3 is opened to feed raw water to be treated into the tank. The raw water is subjected to ion exchange treatment while passing through the ion exchange resin bed 13 in an upward flow, becomes treated water, is collected in the water collector 10, and flows out from the side nozzle 4.

During this time, the downward flow communication hole 9 is automatically closed by the opening/closing lid 15. Communication hole 8 for upward flow
Also, the water pressure above and below the partition wall 5 is balanced due to the closure of the upper nozzle 2, and the water pressure from the lower chamber 7 to the upper chamber 6 is balanced.
No upward passage occurs. Ion exchange resin bed 1
An upward force acts on 3 due to the upward flow, and this force acts as an upward force on the opening/closing lid 14 from the communication hole 8, but the opening/closing lid 14 has a weight that overcomes this upward force, so it does not open, and therefore the ions The exchange resin is prevented from flowing into the upper chamber 6, and the ion exchange resin bed 13
is tightly held on the lower surface of the partition wall 5.

() Regeneration and cleaning operations When the exchange capacity of the ion exchange resin is consumed due to continuous water flow and the processing function deteriorates, the water flow is stopped, the side nozzle 4 is closed, and the lower nozzle 3 is opened toward the discharge system. The regenerant liquid is supplied from the upward nozzle 2. The lid 15 can be opened and closed by the downward flow of regenerating liquid.
is pushed down, the regenerated liquid flows into the lower chamber 7 through the downward flow communication hole 9, passes through the ion exchange resin bed 13 in a downward flow for regeneration, and the regenerated liquid is discharged from the lower nozzle 3. .

After the regeneration is completed, the cleaning water is flowed downward through the same route to push out the regenerated liquid, and the ion exchange resin bed 1
Wash 3.

Note that the regeneration operation can be carried out by draining the water in the upper chamber 6 and supplying the regenerating liquid from the side nozzle 4 after the water flow process is stopped. In this case, the regenerating agent liquid is added to the water in the upper chamber 6. Since it is not diluted with water, regeneration can be performed more effectively.

() Pollutant cleaning and discharging operation By repeating the water flow treatment operation, the suspended matter contained in the raw water is filtered and gradually accumulated in the ion exchange resin bed 13, so in this case, the ion exchange treatment is not performed. It is necessary to stop the process, wash the ion exchange resin bed 13, remove pollutants, and discharge it together with the washing waste water. This operation is carried out by closing the side nozzle 4, opening the upper nozzle 2 toward the discharge system, and supplying wash water from the lower nozzle 3. The water that has passed through the ion exchange resin bed 13 in an upward flow cannot flow to the side nozzle 4, and the upward flow pushes up the opening/closing lid 14 and opens the upward flow communication hole. The upper nozzle 2 flows from the lower chamber 7 to the upper chamber 6 through the upper nozzle 8.
is discharged from. Due to this upward flow, the ion exchange resin in the lower chamber 7 is fluidized, and a portion of it moves to the upper chamber 6 through the communication hole 8, and is spread at the same rate in both chambers, so that pollutants can be effectively washed and removed. It will be done.

After cleaning is completed, the upward flow is stopped and water is passed downward from the upper nozzle 2. The opening/closing lid 15 is pushed down and the ion exchange resin in the upper chamber 6 flows through the opened communication hole 9 into the lower chamber 7. Returning to , an ion exchange resin bed 13 is formed.

The important points regarding the configuration and operation of the device of the present invention are that the ion exchange resin can be completely prevented from moving upward to the upper chamber 6 during the upward flow ion exchange treatment operation, and that the upward movement of the ion exchange resin during the contaminant cleaning and removal operation can be completely prevented. The aim is to simultaneously move the flowing washing water and the ion exchange resin to the upper chamber 6 with as little resistance as possible. Regarding this point, in the embodiment described above, the opening area of the upward flow communication hole 8 is made smaller than that of the downward flow communication hole 9, so that the area on which the upward force of the ion exchange resin acts on the opening/closing lid 14 during the ion exchange treatment is made smaller. The opening/closing lid 14 is prevented from opening. Once the opening/closing lid 14 is pushed up as shown by the dotted line in FIG. 1 due to the upward flow during cleaning and discharging the pollutants, the gravitational moment acting on it becomes smaller, so the opening/closing lid 14 is moved larger toward the inside of the upper chamber 6. When it is opened, a portion of the ion exchange resin immediately moves upward to the upper chamber 6, and upward flow cleaning is performed with less drag.

FIG. 3 shows the structure of a partition wall 5A used in an embodiment of the present invention different from that described above. In this embodiment, the partition wall 5A is formed in the form of a lattice, is three-dimensional, has high pressure resistance, and has a large area ratio of the communication holes 8A and 9A, which are lattice holes, and has a low overresistance. Each of the opening/closing lids 14A and 15A faces the upward flow communication hole 8A and the downward flow communication hole 9A extending over the plurality of grid holes, and the upper and lower edges of the grid hole are covered with rubber sheets 16 that are in close contact with the lids. It is attached to the partition wall 5A through bolts 17 that are in close contact with the partition wall 5A. The upper edge of the lattice frame of the communication hole 8A for upward flow is formed in a semicircular cross section and is in line contact with the rubber sheet 16 on the lower surface of the opening/closing lid 14A, so that the ion exchange resin is transferred to the upper chamber 6. Even when the opening/closing lid 14A is closed, the ion exchange resin is not caught.

The communication hole is not limited to the round hole or square hole of the above embodiment, but may be formed as a slit-like long hole.

As described above, according to the present invention, during countercurrent regeneration type ion exchange treatment, the ion exchange resin bed is placed in the lower part of the tank during the operation step in which the lower part of the tank is filled with ion exchange resin and the ion exchange treatment is performed with upward flowing water. The upper space can be used to wash and remove sludge substances accumulated in the ion exchange resin bed with water flowing upward with little passage resistance. When the ion exchange resin that has migrated into the space is returned to the lower space, less ion exchange resin remains on the partition wall, and the device has a simple configuration and can be easily manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is a vertical side view of an ion exchange device according to one embodiment of the present invention, Fig. 2 is an enlarged longitudinal side view of its partition wall, communication hole, and opening/closing lid portion, and Fig. 3 is a partition wall and communication port of another embodiment. FIG. 3 is an enlarged longitudinal cross-sectional side view of the hole and the opening/closing lid portion. 1... Ion exchange treatment tank, 2... Upper nozzle,
3...Lower nozzle, 4...Side nozzle, 5,5A
...Partition wall, 6...Upper chamber, 7...Lower chamber, 8,8
A... Upward flow communication hole, 9, 9A... Downward flow communication hole, 10... Water collector, 11... Strainer, 1
2... Support plate, 13... Ion exchange resin bed, 1
4, 14A...Upward flow opening/closing lid, 14a...Slanted surface portion, 15, 15A...Downward flow opening/closing valve, 16...
...Rubber sheet, 17...Bolts.

Claims (1)

[Claims] 1. Ion exchange treatment is performed by passing the liquid to be treated in an upward flow through a bed of granular ion exchange resin formed at the bottom of a vertical closed tank, thus reducing the treatment capacity. In the countercurrent regeneration ion exchange treatment method, in which regeneration is carried out by passing the regenerating liquid in a downward flow through the ion exchange resin bed, the inside of the tank is divided into upper and lower parts by partition walls with communicating holes distributed in a distribution manner, and the bottom surface of the partition In addition to installing treated water collectors at small intervals, an opening/closing lid with a higher specific gravity than the liquid is rotatably attached to the bulkhead above the communication hole for upward flow, and a lid for collecting water is attached to the bottom of the communication hole for downward flow. A countercurrent regeneration type ion exchange device characterized by an opening/closing lid with a lower specific gravity rotatably attached to a partition wall. 2. The device according to claim 1, wherein the partition wall is formed into a lattice body, and one opening/closing lid faces a communicating hole made up of a plurality of lattice holes. 3. The device according to claim 1, wherein the opening area of the communication hole for the opening/closing lid having a high specific gravity is made smaller than the opening area for the opening/closing lid having a small specific gravity. 4. The device according to claim 1, wherein the upward flow communication hole and its opening/closing cover are formed in a closed state of line contact.