JP6998834B2 - Cleaning test equipment for ion exchange resin - Google Patents

Description

The present invention relates to an apparatus for testing the detergency of an ion exchange resin used in a water treatment system or the like.

As a water treatment system, there is a pure water production device using an ion exchange resin. In producing pure water from raw water such as industrial water, a cation exchange resin that removes the hardness component of the raw water and an anion exchange resin that removes the anion component are used in combination (see, for example, Patent Document 1). ..
When the ion exchange resin is used with water flow to some extent, the target removal performance deteriorates. Therefore, a reproduction process is performed to restore the performance. However, it cannot be completely restored to the state of a new resin by regeneration, and the resilience gradually decreases, and eventually the life is reached and the ion exchange resin needs to be replaced. The anion exchange resin that removes organic substances has different components of organic substances for each raw water, and the replacement timing of the anion exchange resin differs for each raw water. In particular, raw water containing humic acid tends to contaminate the anion exchange resin, and the detergency after chemical regeneration deteriorates.

In other words, it is important to evaluate the degree of contamination of the ion exchange resin for each raw water. Since a large amount of reclaimed liquid and washing water must be passed in order to evaluate the degree of contamination of the ion exchange resin as it is, for example, a test device in which the amount of resin is reduced to about 500 ml is used.

Generally, the test device has the same configuration as the actual machine. For example, it has a resin cylinder filled with an ion exchange resin, a regeneration route for supplying a regeneration liquid to the resin cylinder, and a cleaning route for supplying a cleaning liquid (pure water) to the regeneration flow path for cleaning. In the test, the regenerated liquid is first supplied to the resin, then the resin and the regenerated liquid in the regeneration path are extruded, and then the liquid for the detergency test (pure water) is poured into the resin cylinder. Then, the electric conductivity of the liquid on the inlet side and the outlet side of the resin cylinder is measured, and the detergency of the ion exchange resin is evaluated based on the degree of decrease in the outlet electric conductivity.

Japanese Unexamined Patent Publication No. 2000-8452

In a test device with a reduced amount of resin, the amount of resin is scaled down from the actual machine, so the amount of water flowing through the ion exchange resin is also reduced at a scaled down rate. When the regenerated liquid is extruded in the direction of the resin cylinder, the regenerated liquid cannot be sufficiently replaced with the cleaning liquid due to the decrease in the amount of water flow, and it is particularly affected by the regenerated liquid remaining in the piping, and is used for the cleaning property test. The reliability of the evaluation of detergency using a liquid will decrease.

An object of the present invention is that when a part of the ion exchange resin collected from an actual machine is used to test the detergency of the ion exchange resin, the influence of the residual regenerated liquid in the pipe due to the decrease in the amount of water flow is small and the reliability is low. It is an object of the present invention to provide a cleaning test apparatus having high performance.

The cleaning test apparatus according to the present invention is an apparatus for testing the cleaning property of the ion exchange resin after regeneration by using a part of the ion exchange resin collected from the actual machine, and is a resin filled with the ion exchange resin to be tested. Cleaning that cleans the cylinder, the regenerated liquid path through which the regenerated liquid for regenerating the ion exchange resin is passed through the resin cylinder, and the ion exchange resin filled in the resin cylinder by a route different from the regenerated liquid path. A water flow path, an inlet electric conductivity cell in the wash water flow path for measuring the electric conductivity of the wash water on the inlet side of the resin cylinder, and the wash water on the outlet side of the resin cylinder. It has an outlet electrical conductivity cell to measure the electrical conductivity and
A cheese that can pass liquid in three directions of the regenerated liquid path, the washing water passage path, and the resin cylinder is arranged on the upper part of the resin cylinder, and the washing water from the washing water passing passage passes through the cheese. It is characterized in that at least a part of the regenerated liquid pathway including the connection portion with the cheese can be backwashed.

According to the present invention, even if a scaled-down resin cylinder is used in which the amount of water flow is reduced by backwashing the regenerated liquid remaining in the liquid passage path of the regenerated liquid, the residual regenerated liquid in the piping for the detergency evaluation is used. The influence of the above can be reduced, and the reliability of the detergency evaluation of the ion exchange resin can be improved.

The schematic diagram of the cleaning test apparatus which concerns on one Embodiment of this invention. The schematic diagram which shows the flow of the liquid in the cleaning test apparatus which concerns on one Embodiment of this invention. The schematic diagram which shows the flow of the liquid in the cleaning test apparatus which concerns on one Embodiment of this invention. The schematic diagram which shows the flow of the liquid in the cleaning test apparatus which concerns on one Embodiment of this invention. The schematic diagram which shows the flow of the liquid in the cleaning test apparatus which concerns on one Embodiment of this invention. The schematic diagram which shows the flow of the liquid in the cleaning test apparatus which concerns on one Embodiment of this invention. The schematic diagram of the cleaning test apparatus of the comparative example. The graph which showed the cleaning property in the cleaning test apparatus which concerns on one Embodiment of this invention, and the cleaning test apparatus of a comparative example by the change of electric conductivity.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, an apparatus for testing the detergency for an anion exchange resin will be described, but the present invention can also be applied to a cation exchange resin.

FIG. 1 is a schematic view of a cleaning test apparatus 1000 according to an embodiment of the present invention. The cleaning test apparatus 1000 has a resin cylinder 61, a reclaimed liquid path, a washing water passage path, an inlet electric conductivity cell 31, and an outlet electric conductivity cell 32. The resin cylinder 61 is filled with the ion exchange resin 63 partially extracted from the actual machine, leaving the air layer 62 in the resin cylinder 61. In the regenerating liquid path, the regenerating liquid for regenerating the ion exchange resin is passed from the regenerating liquid tank 51 to the resin cylinder 61. The washing water flow path is different from the regeneration liquid path, and the washing water is passed from the pure water tank 11 to the resin cylinder 61 to wash the ion exchange resin. The drainage from the outlet of the resin cylinder 61 is discharged from the second drain (D2) 72 in the case of regeneration with the regeneration liquid and extrusion of the regeneration liquid, and from the third drain (D3) 73 during the washing water monitor. .. The inlet electric conductivity cell 31 is in the washing water passage path, and measures the electric conductivity of the washing water on the inlet side of the resin cylinder 61. The outlet electric conductivity cell 32 measures the electric conductivity of the washing water on the outlet side of the resin cylinder 61. Reference numerals 41 to 46 indicate valves, and although an electromagnetic valve is used in this embodiment, a manual cock or other mechanical valve can also be used. As these valves, a two-way valve or a three-way valve is used depending on the purpose. Further, reference numerals 101 to 119 are pipes connecting each element. Further, the drainage from the valves 42, 43, 47 is discharged to the first drain (D1) 71 via the pipes 111 to 113.

The regenerating liquid path includes a regenerating liquid tank 51, a pump 22, and a three-way valve (three-way solenoid valve) 41 to 43.
Each of the three-way solenoid valves 41 to 43 has three connection ports. When no current is applied (off state), the open connection port is NO (normally open), the closed connection port is NC (normally closed), and the connection port is always open regardless of the current application. The existing connection port is called COM (common). When a current is applied (on state), the opening states of NO and NC are reversed. That is, in the off state, the connection port COM and the connection port NO are connected, and in the on state, the connection port COM and the connection port NC are connected. In this way, the opening and closing of the connection port NO and NC is controlled based on the on / off of the current by the control circuit (not shown).

The regenerating liquid tank 51 stores the regenerating liquid, and the outlet of the regenerating liquid tank 51 is connected to the connection port NC of the three-way solenoid valve 41 via the pipe 106. The connection port COM of the three-way solenoid valve 41 is connected to the connection port COM of the three-way solenoid valve 42 via the pipe 107, the pump 22, and the pipe 108. The connection port NO of the three-way solenoid valve 42 is connected to the drain 71 via the pipe 113, and the connection port NC of the three-way solenoid valve 42 is connected to the connection port NO of the three-way solenoid valve 43 via the pipe 109. The connection port NC of the three-way solenoid valve 43 is connected to the drain 71 via the pipe 112, and the connection port COM of the three-way solenoid valve 43 is connected to the inlet of the resin cylinder 61 via the pipe 110 and the cheese 81. Of the two three-way solenoid valves 42 and 43, the three-way solenoid valve 43 on the cheese 81 side may be referred to as a "first three-way valve" and the three-way solenoid valve 42 may be referred to as a "second three-way valve".

The wash water passage path includes a pure water tank 11 for storing pure water, a pipe 101, a pump 21, pipes 102 and 103, and a three-way solenoid valve 47. The three-way solenoid valve 47 has the same configuration as the above-mentioned three-way solenoid valves 41 to 43. The three-way solenoid valve 47 is sometimes referred to as a "third three-way valve".

Further, the outlet of the pure water tank 11 is connected to the connection port NO of the three-way solenoid valve 41 of the reclaimed liquid path via the pipes 101 and 105. Further, an inlet electric conductivity cell 31 is provided between the pipes 102 and 103 in the washing water passage path from the pure water tank 11 to the three-way solenoid valve 47, and the pipe 103 is a connection port of the three-way solenoid valve 47. It is connected to COM. The connection port NC of the three-way solenoid valve 47 is connected to the first drain 71 via the pipe 111, and the connection port NO of the three-way solenoid valve 47 is connected to the inlet of the resin cylinder 61 via the pipe 104 and the cheese 81. ..

Cheese 81 is a pipe joint that can pass liquid in three directions. Each pipe and cheese is made of a material that is resistant to liquids that pass through and does not elute organic substances. For example, the inside of a resin tube such as fluororesin or a metal tube is lined with resin. Known materials such as those can be used. The inner diameter of each pipe and cheese is appropriately selected according to the amount of liquid to be passed. The cheese 81 is connected in three directions of the pipes 104 and 110 and the inlet of the resin cylinder 61. A short pipe may be arranged between the cheese 81 and the resin cylinder 61 as long as the effect of the present invention is not affected.

The outlet of the resin cylinder 61 is connected to a path for drainage. The path has a three-way solenoid valve 44 and two-way solenoid valves 45, 46. The three-way solenoid valve 44 has the same configuration as the above-mentioned three-way solenoid valves 41 to 43. The two-way solenoid valves 45 and 46 are controlled to open and close based on the on / off of a current by a control circuit (not shown), and are connected to the on state.

The connection port COM of the three-way solenoid valve 44 is connected to the outlet of the resin cylinder 61 via the pipe 114, and the connection port NC of the three-way solenoid valve 44 is the second drain via the pipe 115, the two-way solenoid valve 45, and the pipe 116. It is connected to 72. The connection port NO of the three-way solenoid valve 44 is connected to the third drain 73 via the pipe 117, the outlet electric conductivity cell 32, the pipe 118, the two-way solenoid valve 46, and the pipe 119.
The discharge amount of the pumps 21 and 22, the orifice diameter of the solenoid valve, the volume of the chamber of the electric conductivity cell and the like are appropriately optimized according to the amount of resin to be filled in the resin cylinder 61.

Hereinafter, the operation of the cleaning test apparatus 1000 shown in FIG. 1 will be described with reference to FIGS. 2 to 6. In these figures, the flow of liquid is shown by a thick line.
First, FIG. 2 shows the flow of the liquid in the reclaimed liquid passing step (first step), and the three-way solenoid valves 41, 42, 44, 45, 47 are turned on to drive the regenerated liquid pump 22. Then, the regenerated liquid is passed from the regenerated liquid tank 51 to the resin cylinder 61 and discharged to the second drain (D2) 72. By passing the regenerated liquid through the anion exchange resin 63, organic substances and the like adhering to the anion exchange resin 63 are removed. The other valves are off. Further, by turning on the third three-way valve 47, the connection port NO on the cheese side is closed, and backflow from the cheese 81 to the valve 47 does not occur. As the regenerating liquid, a diluted alkali, for example, a NaOH aqueous solution having a concentration of several percent can be used.

FIG. 3 shows the flow of the liquid in the reclaimed liquid extrusion step (second step). Here, it is the same as FIG. 2 except that the valve 41 is turned off, and instead of the reclaimed liquid, pure water (ultrapure water) passes through the regenerated liquid path (also referred to as the regenerated liquid line) from the pure water tank 11. The residual regenerated liquid in the resin cylinder 61 is pushed out, and the drainage from the resin cylinder 61 is discharged to the second drain (D2) 72.

FIG. 4 shows the flow of the liquid in the reclaimed liquid line cleaning step (third step). Here, from FIG. 3, with the valve 42 turned off, a part of the regenerated liquid supply path between the valve 41 and the valve 42 is washed with pure water from the pure water tank 11, and the pipe 113 is connected to the connection port NO of the valve 42. The drainage liquid is discharged to the drain 71 via the above. This third step may be performed as needed and is not essential.

FIG. 5 shows the flow of the liquid in the washing water line washing step (fourth step). By turning off the valve 47 and driving the pump 21, pure water as washing water is supplied from the washing water flow path (also called the washing water line) via the inlet electric conductivity cell 31 and the valve 47 via the cheese 81. The valve 43 is backwashed in the direction of the valve 43, and the valve 43 is turned on and discharged to the drain 71 via the pipe 112. By opening the valve 43, the inflow to the valve 43 is prioritized over pushing the air layer 62 on the filled resin 63 with the resin cylinder 61, and the pipe 110 from the cheese 81 to the valve 43 is washed. The air layer 62 provided in the resin cylinder 61 acts as an air valve in this way, and makes it possible to change the liquid flow direction in the cheese 81 having no switching mechanism. In this fourth step, since there is no load on the resin cylinder 61, the washing water can flow in the valve 43 direction at a sufficient flow rate, and the residual regenerated liquid in the pipe 110 can be removed. The third step and the fourth step may be performed at the same time. Further, after the third step or the fourth step, the valve 47 is turned on and the pump 21 is driven to allow pure water as a cleaning liquid to flow through the pipe 111 to clean the pipe 113 and the pipe 111 on the downstream side of the pipe 112. It can be performed. Further, the excess washing water when the valve 47 is turned from the off state to the on state is drained.

Finally, as shown in FIG. 6, the detergency of the ion exchange resin 63 is evaluated by passing the washing water from the inlet electric conductivity cell 31 to the outlet electric conductivity cell 32. Here, the valve 44 is turned off and the valve 46 is opened. By turning off the valves 42 and 43, the backflow of the washing water from the cheese 81 is stopped. The drainage from the valve 44 that passes through the pipe 117, the outlet electric conductivity cell 32, and the pipe 118 is discharged to the drain 73 through the pipe 119 by opening the valve 46.

FIG. 7 is a schematic view showing the configuration of the cleaning test apparatus 2000 of the comparative example corresponding to the reduced version of the conventional actual machine configuration. Those with the same reference numerals as those in FIG. 1 show the same configuration. For each pipe, the reference numerals are omitted except for the pipe 120 that connects the valve 43 and the resin cylinder 61. The route for drainage downstream of the resin cylinder 61 is the same as in FIG.
The ion exchange resin 63 partially extracted from the actual machine is filled in the resin cylinder 61, leaving the air layer 62. The regeneration of the ion exchange resin is introduced from the regeneration liquid tank 51 for storing the regeneration liquid into the resin cylinder 61 via the valve 41, the pump 22, and the valves 42, 43, and the regeneration liquid that has passed through the ion exchange resin 63 is the valve 44. , 45 is discharged to the drain 72. Next, before evaluating the detergency, the regenerated liquid of the pipe from the valve 42 to the resin cylinder 61 is extruded by introducing the cleaning liquid from the tank 11 via the valve 41 and discharged to the drain 72. In addition, pipe cleaning is also performed from the tank 11 through the routes of the valve 41, the pump 22, the valves 42, 43, and the drain 71. After that, wash water is introduced into the resin cylinder 61 via the pump 21, the inlet electric conductivity cell 31, the valves 42, and 43, and the drainage liquid is discharged from the valve 44 to the outlet electric conductivity cell 32, the valve 46, and the drain 73. do. The electric conductivity of the liquid on the inlet side and the outlet side of the resin cylinder is measured, and the detergency of the ion exchange resin is evaluated based on the degree of decrease in the outlet electric conductivity.
In the device of FIG. 7, the water flow to the pipe 120 is only in one direction in which the water is discharged to the drain 72 via the resin cylinder 61 in which the amount of water flow is limited, and the influence of the residual regenerated liquid in the pipe 120 is the outlet electricity. It greatly affects the degree of decrease in conductivity.

FIG. 8 compares the cleaning properties of the anion exchange resin extracted from the same water treatment system when the cleaning test apparatus 2000 of the comparative example shown in FIG. 7 and the cleaning test apparatus 1000 according to the present invention shown in FIG. 1 are used. The horizontal axis shows the water flow time of the washing water, and the vertical axis shows the difference between the measured values of the outlet electric conductivity cell 32 and the inlet electric conductivity cell 31, that is, the electric conductivity of the discharged water. The pipe 110 of the cleaning test device 1000 and the pipe 120 of the cleaning test device 2000 have the same inner diameter and the same length, and the amount of water flowing to the resin cylinder 61 is the same.

As shown in FIG. 8, in the cleaning test apparatus 2000 of the comparative example of FIG. 7, the decrease in electrical conductivity is slow due to the influence of the residue in the piping of the regenerated liquid in the case of a small amount of ion exchange resin in which the amount of water flow decreases. Also, the electrical conductivity at the end is high. Therefore, when the cleaning test apparatus 2000 is used, it is determined that there are many organic substances that affect the ion exchange resin. On the other hand, it can be seen that the cleaning test apparatus 1000 according to the present invention is less affected by the regenerated liquid and can be appropriately evaluated.
In order to reduce the influence of the residual regenerated liquid in the pipe 120 of the cleaning test apparatus 2000, it is conceivable to shorten the length of the pipe 120 or reduce the inner diameter of the pipe 120 to increase the flow velocity. Problems such as a decrease in the degree of freedom of arrangement and a change in the flow rate due to pressure loss occur.
On the other hand, in the present invention, since the pipe 110 can be washed without passing through the resin cylinder 61, a sufficient amount of water flow can be secured, and the pipe 110 can be made longer than the pipe 120. As a result, the degree of freedom in device arrangement is improved.
By using the cleaning test apparatus according to the present invention, it is possible to accurately confirm the influence of raw water in a water treatment system using an ion exchange resin, particularly the influence of organic substances in the raw water on the anion exchange resin with a small amount of water flow. can.

11 Pure water tank 21, 22 Pump 31 Inlet electric conductivity cell 32 Outlet electric conductivity cell 41-47 Valve 51 Regeneration liquid tank 61 Resin cylinder 62 Air layer 63 Ion exchange resin 71-73 Drain 81 Cheese 101-119 Piping 1000 Cleaning Test equipment

Claims (5)

A device for testing the detergency of the ion exchange resin after regeneration using a part of the ion exchange resin collected from the actual machine.
A resin cylinder filled with an ion exchange resin to be tested and
A regenerating liquid path for passing a regenerating liquid for regenerating the ion exchange resin through the resin cylinder, and
A cleaning water passage route for cleaning the ion exchange resin filled in the resin cylinder by a route different from the regeneration liquid route, and a cleaning water passage route.
An inlet electric conductivity cell in the washing water passage path for measuring the electric conductivity of the washing water on the inlet side of the resin cylinder, and an inlet electric conductivity cell.
It has an outlet electric conductivity cell for measuring the electric conductivity of the washing water on the outlet side of the resin cylinder.
On the upper part of the resin cylinder, a cheese that can pass liquid in three directions of the regenerated liquid passage, the washing water passage, and the resin cylinder is arranged, and the washing water from the washing water passage is used through the cheese. A washing test apparatus characterized in that at least a part of the reclaimed liquid path including a connection portion with the cheese can be backwashed. The reclaimed liquid path has two three-way valves in front of the cheese, a always open connection port to which the first three-way valve on the cheese side is connected to the cheese side, and a second switchable to each other. It has a connection port connected to the three-way valve side of the cheese and a connection port connected to the path side for draining the liquid passing through the first three-way valve. The cleaning test apparatus according to claim 1, wherein the backwashing of the regenerated liquid path up to the first three-way valve is controlled so that the connection port on the path side for draining the liquid is switched to an opening. The second three-way valve has a connection port on the side to which the regenerated liquid is always in an open state, a connection port connected to the first three-way valve side that can be switched to each other, and the second three-way valve. It has a connection port connected to the path side for draining the passing liquid, and the wash water is passed from a path different from the wash water flow path to regenerate the second three-way valve. The cleaning test apparatus according to claim 2, wherein the liquid path is washed and the washing water can be drained to the path for draining the liquid. The wash water passage has a third three-way valve between the inlet electrical conductivity cell and the cheese, and the third three-way valve is always on the inlet electrical conductivity cell side in an open state. A claim having a connection port to be connected, a connection port connected to the cheese side which is switchable to each other, and a connection port connected to a path side for draining liquid passing through the third three-way valve. The cleaning test apparatus according to any one of 1 to 3. The cleaning test apparatus according to any one of claims 1 to 4, wherein the resin cylinder has an air layer on a region filled with the ion exchange resin.

Images