JP2003299937A - Performance evaluation method for reverse osmosis membrane element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a performance evaluation device of a reverse osmosis membrane element simultaneously evaluating a performance of two reverse osmosis membrane element samples arranged in a housing in series by one sample liquid to be tested. <P>SOLUTION: Two reverse osmosis membrane element samples 15a, 15b are installed in the housing 16 at a series arrangement and two permeated water collection pipes 19a, 19b are bonded by a sealing means 30 such that circulation of permeated water is shut off. The sample liquid to be tested is force-fed to the housing 16. Thereby, the first permeated water is obtained from the first reverse osmosis membrane element sample 15a and the second permeated water is independently obtained from the second reverse osmosis membrane element sample 15b respectively. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a performance evaluation of a reverse osmosis membrane element for simultaneously evaluating the performance of two reverse osmosis membrane element specimens arranged in series in one housing with one specimen liquid. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, a reverse osmosis membrane module has been used for the purpose of desalting various kinds of water to be treated (including deionization, hereinafter, deionization and deionization are collectively referred to as desalination). For example, although ultrapure water is used for cleaning electronic component members such as semiconductor devices, a reverse osmosis membrane module is often used in the process of producing ultrapure water. Generally, the reverse osmosis membrane element attached to the module is installed for the purpose of desalination, but the reverse osmosis membrane has a large total organic carbon (TOC) removal capacity, and it is required that the water quality with the TOC reduced as much as possible. It is no exaggeration to say that the use of the reverse osmosis membrane module is indispensable in the manufacturing process of ultrapure water used in the cleaning process of the electronic component members.

As an example of the structure of a conventional reverse osmosis membrane module, as shown in FIGS. 4 and 5,
A bag-shaped reverse osmosis membrane 81 is spirally wound around the permeated water collecting pipe 80, and its upper portion is covered with an exterior body 82, and both ends thereof are for preventing the spirally wound reverse osmosis membrane 81 from protruding. A telescope stop 84 having several radial ribs 83 is attached to the. A single reverse osmosis membrane element 85 is formed by the permeated water collection pipe 80, the reverse osmosis membrane 81, the exterior body 82, and the telescope stop 84, and the respective permeated water collection pipes 80 are connected by a connector (not shown). The reverse osmosis membrane element 85 in the housing 86.
Load multiple. Although a gap 87 is formed between the outer circumference of the reverse osmosis membrane element 85 and the inner circumference of the housing 86, this gap 87 is closed by a brine seal 88. It should be noted that at one end of the housing 86, a treated water inflow pipe (not shown) for flowing the treated water into the housing,
Further, a treated water pipe (not shown) and a non-permeated water pipe (not shown) communicating with the permeated water collection pipe 80 are attached to the other end, and the reverse osmosis membrane module is formed by the housing 86, its internal parts, pipes (nozzles), etc. 89 is constructed.

Reverse osmosis membrane module 89 having such a structure
When the treated water is treated with, the treated water is press-fitted from one end of the housing 86 by using a pump. However, as shown by the arrow in FIG. 4, the treated water is the radial ribs of the telescope stopper 84. The first reverse osmosis membrane element 85 penetrates through the gaps 83, and a part of the liquid to be treated passes through between the membranes of the reverse osmosis membrane element 85 and the next reverse osmosis membrane element 8
5, the water to be treated in the other portion permeates the reverse osmosis membrane 81 to become permeated water, and the permeated water is collected in the permeated water collecting pipe 80. In this way, the water to be treated passes through the reverse osmosis membrane element 85 one after another, and the water to be treated that has not permeated the reverse osmosis membrane is taken out from the other end of the housing 86 as non-permeated water (concentrated water), and the reverse osmosis is performed. The permeated water that has permeated the membrane is taken out of the housing 86 via the permeated water collecting pipe 80.

As described above, in the desalination by the reverse osmosis membrane module, desalted water can be obtained only by pressurizing the water containing salts into the reverse osmosis membrane module by using the pump, and compared with the electrodialysis method or the evaporation method. The apparatus is simple, and the organic matter that is the TOC component can be removed, and good treated water can be obtained.
On the other hand, the reverse osmosis membrane element, when used for a long period of time, has a difference in that the reverse osmosis membrane is contaminated with various inorganic or organic substances, or microorganisms are generated on the wetted part or the membrane surface of the raw water in the module. The pressure is increased, the amount of permeated water is reduced, and further, the deterioration of the membrane causes a decrease in the desalination rate, resulting in poor performance, which makes it difficult to use. The reverse osmosis membrane element determined to be difficult to use is taken out of the housing, is replaced with a new reverse osmosis membrane element, and the taken out reverse osmosis membrane element is discarded as industrial waste.

When the reverse osmosis membrane element is disposed of as industrial waste, there are problems of disposal cost and disposal place.
As a solution to this problem, it has been conventionally proposed that a used reverse osmosis membrane module be regenerated and reused. The reverse osmosis membrane with a reduced desalination rate is due to the fact that the dense layer of the reverse osmosis membrane is chemically oxidized and its molecular structure is destroyed, and it is difficult to restore the original state. However, the reverse osmosis membrane whose differential pressure is increased or permeated water is decreased due to the membrane being contaminated can be subjected to regenerative treatment and reused. That is, the reverse osmosis membrane module whose performance has deteriorated due to the contamination of the membrane is brought into contact with an organic chemical solution having a high detergency such as acid, alkali or citric acid, and the inside of the vessel or the membrane surface of the reverse osmosis membrane element or the inside of the membrane is It removes contaminants such as inorganic substances, organic substances, microbial slime, etc. that adhere to and deposit on. By such regenerative treatment, the performance of the reverse osmosis membrane having an increased differential pressure or a reduced amount of permeated water can be restored.

However, the regenerative treatment of a used reverse osmosis membrane module that has been conventionally proposed is performed in a plurality of series of reverse osmosis membrane modules in a water treatment facility, and a chemical solution tank and piping required for the regenerative treatment are required. , It is necessary to install regenerative treatment equipment equipped with valves, pumps, etc. and its installation location, it is necessary to install a drainage treatment device for the chemical solution used for regenerative treatment, and the operating rate of the regenerative treatment device is extremely small. There are various problems such as not being profitable for the investment of regenerative treatment equipment. Therefore, in recent years, instead of performing regenerative treatment of used reverse osmosis membrane elements in individual water treatment facilities, by concentrating them in specific dedicated facilities, the operating rate of the regenerative treatment device is increased, Development of a comprehensive utilization technology for recovering used reverse osmosis membrane elements, regeneration treatment, and supply of regenerated products such that the regenerated reverse osmosis membrane element is provided immediately upon request is under consideration.

[0008]

In the regenerative treatment of such a used reverse osmosis membrane element, it is necessary to investigate the performance of the recovered reverse osmosis membrane element in advance and perform the regenerative treatment according to the result. Further, after the regenerative treatment, it is necessary to investigate the performance after the regeneration in order to grasp the regenerative state of the regenerated product. However, conventionally, a performance evaluation device for a reverse osmosis membrane element for evaluating a used reverse osmosis membrane element recovered from a reverse osmosis membrane module used in a water treatment facility has not been proposed yet. Although a new reverse osmosis membrane element is subjected to the same performance evaluation at the time of shipment, the performance evaluation device used for this is a module in which one reverse osmosis membrane element is loaded in one housing, or This is a module in which multiple reverse osmosis membrane elements are installed in parallel in one housing, and two reverse osmosis membrane elements can be simultaneously evaluated individually with one analyte liquid. Absent. In this case, the performance of only one reverse osmosis membrane element sample can be evaluated in one housing, and the efficiency of the performance evaluation test is low. Further, since the performance evaluation of the reverse osmosis membrane element sample is carried out with the same configuration as the assembly form used in the water treatment facility, for example, as shown in FIG. A configuration is conceivable in which two reverse osmosis membrane modules are configured by loading two and the analyte liquid is supplied instead of the water to be treated. However, in this case, since the permeated water collecting pipes of the two reverse osmosis membrane elements are common, the permeated water obtained by press-fitting one analyte liquid is the mixed water of the permeated water of the two reverse osmosis membrane elements. Therefore, it is not possible to separately evaluate the two reverse osmosis membrane elements.

Therefore, an object of the present invention is to efficiently evaluate the performance of two reverse osmosis membrane element analytes arranged in series in one housing at the same time with one analyte liquid. A performance evaluation device for a membrane element is provided.

[0010]

Means for Solving the Problems The present invention (1) for attaining the above-mentioned object is to provide a test-substance liquid inlet connected to a test-substance liquid pipe at one end and a first permeate flow connected to a first permeate pipe. A housing having an outlet and having a non-permeate water outlet connected to the non-permeate water pipe on the other end side and a second permeate water outlet connected to the second permeate water pipe, and an opening at one end loaded in the housing and having the first permeate A first reverse osmosis membrane element sample having a first permeate water collecting pipe connected to a water outlet, and a second permeate stream which is loaded in the housing and arranged in series with the first reverse osmosis membrane element sample. Second connecting to the exit
A second reverse osmosis membrane element sample having a permeated water collecting pipe, and the opening at the other end of the first permeated water collecting pipe and the other end of the second permeated water collecting pipe are both sealed by a sealing means. The present invention provides a reverse osmosis membrane element performance evaluation device that simultaneously evaluates the performance of two reverse osmosis membrane element samples with one sample solution. Further, in the present invention (2), the sealing means includes a shielding portion for blocking the mutual permeation of the permeated water flowing through both the first permeated water collecting pipe and the second permeated water collecting pipe. The reverse osmosis membrane element, wherein the reverse osmosis membrane element is joined by a joining means provided, or both openings of the other end of the first permeated water collection tube and the second permeated water collection tube are respectively sealed by end caps. A performance evaluation device is provided. Further, the present invention (3) provides a performance evaluation device for a reverse osmosis membrane element, wherein an intermediate non-permeable water outlet for discharging non-permeated water of the first reverse osmosis membrane element sample is provided in a central portion of the housing. To do. Further, the present invention (4) provides a performance evaluation device for the reverse osmosis membrane element, wherein both the first reverse osmosis membrane element sample and the second reverse osmosis membrane element sample are used reverse osmosis membrane elements. Is.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A performance evaluation apparatus for a reverse osmosis membrane element according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a vertical cross-sectional view showing a structure of a performance evaluation device for a reverse osmosis membrane element in the present embodiment, and FIG. 2 shows an example of a joint state between an end plate of a housing and a permeated water collecting pipe of the reverse osmosis membrane element. It is a figure. In FIG. 1, a reverse osmosis membrane element performance evaluation apparatus 10 includes a housing 1
Two reverse osmosis membrane element specimens 15a and 15b are loaded in series in 6 and two permeate water collecting pipes 19a and 19b are installed.
Are coupled by the sealing means 30 so that the flow of permeated water is blocked, and one analyte liquid is press-fitted into the housing 16,
The first permeated water from the first reverse osmosis membrane element sample 15a,
The second permeated water is separately obtained from the second reverse osmosis membrane element sample 15b.

That is, the reverse osmosis membrane element performance evaluation apparatus 10 comprises a sample liquid inlet 21 connected to a sample liquid pipe (not shown) at one end and a first permeated water outlet connected to the first permeate water pipe 22. The non-permeate water outlet 24 and the second permeate water pipe 2 which have 23 and are connected to the non-permeate water pipe (not shown) on the other end side.
5, a first reverse having a housing 16 having a second permeate outlet 26 connected to it and a first permeate collection pipe 19a which is loaded in the housing 16 and has an opening 31a at one end connected to the first permeate outlet 23 by an adapter 27. The second permeate water collection pipe 19b, which is loaded in the housing 16 and is arranged in series with the first reverse osmosis membrane element sample 15a and has the opening 32a at one end connected to the second permeate outlet 26 and the adapter 28. A second reverse osmosis membrane element specimen 15b having an opening 31b at the other end of the first permeated water collection pipe 19a and a second permeated water collection pipe 19
The openings 32b at the other end of b are both sealed by the sealing means 30,
Two reverse osmosis membrane element specimens 15a with one specimen liquid,
15b is evaluated at the same time. Further, at the center of the housing 16, an intermediate non-permeated water outlet 33 through which the non-permeated water of the first reverse osmosis membrane element sample 15a, which is installed if necessary, is provided. 1 and 2
As shown in FIG. 2, the both side members on one end side and the other end side of the housing 16 are end plates 20 which are usually separate members from the cylindrical member of the main body, and the end plate 20 on the one end side is the first permeate outlet 2
3. It has a through hole which becomes the sample liquid inlet 21. The first permeated water outlet 23 formed on the end plate 20 and the permeated water collecting pipe of the reverse osmosis membrane element are joined to each other by the small diameter portion 271 in which the O ring 273 is fitted in the O ring groove on the outer peripheral surface and the inner peripheral portion. Large diameter part 2 with an O-ring 274 fitted in the O-ring groove on the surface
This is done using an adapter 27 consisting of 72 and 72. The outer diameter of the small diameter portion 271 of the adapter 27 is the first permeate outlet 23.
Slightly smaller than the inner diameter of the adapter, the large diameter portion 272 of the adapter 27
The inner diameter of the first permeated water collecting pipe 19a of the reverse osmosis membrane element
Formed slightly larger than the outer diameter of the first permeate outlet 2
3 and the small diameter portion 271 of the adapter 27, and the fitting of the tip portion 191a of the first permeated water collecting pipe 19a and the large diameter portion 272 of the adapter 27 are securely fixed by the O-ring.

As the sealing means 30, the opening 31b at the other end of the first permeated water collecting pipe and the opening 3 at the other end of the second permeated water collecting pipe.
It is not particularly limited as long as it seals 2b. For example, as in this example, the first permeated water collecting pipe 19a and the second permeated water collecting pipe 19b flow through the permeated water flowing through the both water collecting pipes. Or a first permeated water collecting pipe 19a and a second permeated water collecting pipe 19a.
For example, the permeated water collecting pipe 19b may have both openings at the other end sealed with end caps. Coupling means 34 of this example
Is a cylindrical body having the shielding portion 35 as an inner wall, and O-rings fitted in O-ring grooves (not shown) are disposed on the inner peripheral surfaces of the left and right sides partitioned by the shielding portion 35, and Water pipe 19
a and the second permeated water collection pipe 19b and the coupling means 34 are coupled to each other by opening the other end 31b of the first permeated water collection pipe 19a and the other end 32b of the second permeated water collection pipe 19b from the openings on both sides of the cylindrical body.
It is done by press fitting it against the friction of the ring.

Further, in the sealing means 30, when both openings of the other ends 31b and 32b of both water collecting pipes are sealed with end caps, the ends of the sealed end caps are brought into contact with each other or with each other. The first reverse osmosis membrane element 15 is brought into close proximity to the first reverse osmosis membrane element 15 as the analyte liquid is pressed into the housing 16.
Try to prevent the movement of a. Further, as another example of the sealing means 30, for example, a method is adopted in which the shielding portion is a sheet plate made of metal or resin, which is sandwiched by a pair of joining members having a flange portion and is fixed with screws. You can also In this case, the joining member and the other ends 31b and 32b of both the water collecting pipes can be coupled by the O-ring method as in this example. Thus, the sealing means 30 in the present invention
May be of any type such as a split type such as an end cap, an integrated type such as a cylinder having an inner wall in this example, or a connection type in which a sheet plate is sandwiched by flanges.

The first reverse osmosis membrane element sample 15a and the second reverse osmosis membrane element sample 15b used in the performance evaluation apparatus 10 of the present invention are not particularly limited, but for example,
A reverse osmosis membrane element of a reverse osmosis membrane module used in the process of producing ultrapure water for cleaning electronic component members such as semiconductor devices, wherein the used reverse osmosis membrane element is collected and regenerated. It is an object to be evaluated in a performance evaluation test, which is required in a series of processes leading to treatment and supply of regenerated products. Specifically, the first reverse osmosis membrane element sample 15a and the second reverse osmosis membrane element sample 15b are reverse osmosis membrane elements that have been used and recovered, or reverse osmosis membrane elements after regeneration treatment. The performance evaluation of the used reverse osmosis membrane element is conducted to investigate the performance of the recovered reverse osmosis membrane element in advance, and to determine the regenerative treatment conditions etc. according to the result. The performance evaluation of the reverse osmosis membrane element after the treatment is performed in order to grasp the regeneration state of the regenerated product and determine a new supply destination.

The term "used" means that the reverse osmosis membrane element is used for a long period of time, the reverse osmosis membrane is contaminated with various inorganic or organic substances, and microorganisms are generated in the wetted part of the raw water in the module or the membrane surface. The pressure drop, the permeated water amount is decreased, or the performance of the membrane deteriorates, such as a slight decrease in the desalination rate, which makes it difficult to use, or It has been taken out of the module in anticipation of safety, because a predetermined period of time has passed in advance, or the cumulative amount of treated water has reached a specified value, and performance is expected to deteriorate after several months.
Further, the first reverse osmosis membrane element sample 15a and the second reverse osmosis membrane element sample 15b may have the same usage history or different usage history.

Since the first reverse osmosis membrane element sample 15a and the second reverse osmosis membrane element sample 15b are recovered spiral type reverse osmosis membrane elements used in this example, the structure of the reverse osmosis membrane element is as shown in FIG. 4 and the same as shown in FIG. That is, in the first reverse osmosis membrane element sample 15a of FIG.
A bag-shaped reverse osmosis membrane 11a is spirally wound around the upper surface of the bag, and the upper portion of the bag is covered with an outer casing 12. In order to prevent the spirally wound reverse osmosis membrane 11a from protruding, several radial ribs are formed. Telescope stops 14 having 13 are attached at both ends. These first permeate water collection pipes 19
a, reverse osmosis membrane 11a, exterior body 12, telescope stop 1
4 forms one reverse osmosis membrane element. The second reverse osmosis membrane element sample 15b has the same structure as the first reverse osmosis membrane element 15a, and therefore its description is omitted. When the housing 16 is loaded with the two reverse osmosis membrane elements, the first and second reverse osmosis membrane elements 15a, 1
A gap 17 is formed between the outer periphery of 5b and the inner periphery of the housing 16, and this gap 17 is closed by a brine seal 18.

The performance evaluation apparatus 10 for a reverse osmosis membrane element of this example is assembled by sequentially inserting the members from one end of the housing 16. The insertion direction is the direction in which the brine seal 18 is closed. In this example, each member is inserted rightward from the opening at the left end of the housing 16 in FIG. That is, the second reverse osmosis membrane element sample 15b to which the sealing means 30 is attached in advance is inserted into the housing 16 in which the right end plate 20 and the adapter 28 are assembled, and the adapter 28
It is fixed by O-ring by pressing into. Then
The first reverse osmosis membrane element 15a is inserted, and the end portion of the water collection pipe is press-fitted into the sealing means 30 to be fixed. Next, the other end 191a of the first permeate water collection pipe is press-fitted into the adapter 27 that is previously assembled to the end plate 20, and the end plate 20 is fixed to the housing 16 to complete the assembly (see FIG. 2).

A specimen liquid pipe, a first permeate water pipe, a second permeate water pipe, a non-permeate water pipe, and an intermediate non-permeate water, which are connected to the respective inlets and outlets of the performance evaluation device 10 for a reverse osmosis element of the present invention, are passed through. At least one of a flow meter, a pressure gauge, a conductivity meter and a TOC meter can be installed in each pipe of the intermediate non-permeate water pipe, and the measurement system using this can be automated and the performance evaluation can be accelerated. It is suitable. Even if there is no such instrument, the water quality can be evaluated by sampling the liquid or water flowing out from the pipe or a branch pipe branched from the pipe.

The performance evaluation items of the reverse osmosis membrane element performed by using the performance evaluation device 10 for the reverse osmosis membrane element of the present invention include exclusion performance such as salt exclusion performance and organic matter removal performance, and permeation under predetermined measurement conditions. The water-producing capacity for measuring the amount of water and the element pressure difference, which is the pressure difference between the test liquid supply pressure and the non-permeate water (concentrated water) pressure, are mentioned.

The salt exclusion performance is so-called desalination performance, desalination rate and salt exclusion rate, and a salt solution such as a sodium chloride solution is used as a test solution, and the performance of removing salts in the test solution is measured. Is. As a measuring method, for example, a method of measuring the ratio of the electric conductivity of the test liquid to the electric conductivity of the permeated water, and the exclusion of salts from 1- (the electric conductivity of the permeated water / the electric conductivity of the test liquid) Method for measuring the rate and the following formula (1)
The method of measuring the salt elimination rate from the above is mentioned. Salt rejection rate = 1-[(electrical conductivity of permeated water) / {(electrical conductivity of test liquid + electrical conductivity of concentrated water) / 2]] (1)

The organic substance exclusion performance is an evaluation item used when the recovered reverse osmosis membrane element is very clean and when it is not desired to contaminate the reverse osmosis membrane with a salt solution. As a measuring method, in the measuring method described in the salt exclusion performance, the salt may be replaced with an organic substance and applied. Examples of the organic solution used as the sample liquid include isopropyl alcohol solution, saccharide solutions such as glucose, sucrose, and raffinose. Organic matter concentration is T
It is measured with an OC meter.

The fresh water production performance is measured by measuring the flow rate of permeated water under predetermined measurement conditions and comparing it with the flow rate of a new product. When the surface of the reverse osmosis membrane is contaminated, the resistance when water permeates increases and the amount of permeated water decreases. As the numerical value of the new element, the performance value or the catalog value of the new element of the same model as the target recovery element can be used.

The element differential pressure is the differential pressure of the flow path when water is passed through the test liquid, and is specifically the differential pressure between the test liquid supply pressure and the non-permeated water (concentrated water) pressure. If the flow path through which the water to be treated or the concentrated water flows is blocked, the element pressure difference increases.

When performing the performance evaluation using the performance evaluation apparatus 10 of the present invention, the supply pressure of the analyte liquid, the salt concentration, etc. are determined by the pressure type of the reverse osmosis membrane element which is the analyte. That is, in the high-pressure membrane type reverse osmosis membrane element having an operating pressure of 5.5 MPa, the analyte liquid having a sodium chloride concentration of 3% is used, and the medium pressure reverse osmosis membrane element having an operating pressure of 2 to 4 MPa and the operating pressure In the low pressure type reverse osmosis membrane element of 1 to 2 MPa and the ultra low pressure type reverse osmosis membrane element of operating pressure 0.5 to 1 MPa, the analyte liquid having a sodium chloride concentration of 500 to 2,000 mg / L is used. The concentrated water flow rate is 80 liters / minute for the 8-inch element and 20 liters / minute for the 4-inch element.

Next, an example of a method for evaluating the performance of a reverse osmosis membrane element specimen using the performance evaluation device 10 for a reverse osmosis membrane element of this example will be described with reference to FIGS. 1 and 3. The performance evaluation device 10 of FIG. 3 includes a sample liquid pipe 51, a first permeated water pipe 22, a second permeated water pipe 25, and a non-permeated water pipe at each inlet and outlet of the performance evaluation device 10 for the reverse osmosis membrane element of FIG. 53 and intermediate non-permeable water pipe 55 through which intermediate non-permeable water passes
, Each of which is connected to these pipes, and these pipes include a flow meter 41, a pressure gauge 42, a conductivity meter 43, and a TOC meter 44.
Are installed respectively. In FIG. 3, a pump, a needle valve, a switching valve, etc. that determine the measurement pressure are omitted.

In FIGS. 1 and 3, first, the housing 1
A sample liquid is press-fitted from a sample liquid pipe 51 connected to 6 using a pump (not shown). As shown by the arrow in the figure, the analyte liquid passes between the radial ribs 13 of the telescope stop 14 and enters the first reverse osmosis membrane element analyte 15a, and some of the analyte liquid is the first Reverse osmosis membrane element sample 15
The second reverse osmosis membrane element specimen 15b is passed through between the membranes of a, and the analyte liquid of the other portion permeates the first reverse osmosis membrane 11a and becomes permeated water, which is the first permeated water collecting pipe. 1
The water is collected in 9a and flows out from the first permeated water pipe 22 as the first permeated water. Then, the second reverse osmosis membrane element sample 15
The analyte liquid that has reached b passes through the membrane, and the analyte liquid that has not permeated the reverse osmosis membrane flows out to the impervious water pipe 53 connected to the housing 16 as impervious water (concentrated water). Further, the permeated water that has permeated the second reverse osmosis membrane 11b of the second reverse osmosis membrane element sample 15b is the second permeated water collecting pipe 19
It flows out of the housing 16 from the 2nd permeate water pipe 25 via b. On the other hand, the intermediate non-permeated water that has passed through the membranes of the first reverse osmosis membrane element sample 15a and has not reached the second reverse osmosis membrane element sample 15b is the analyte liquid of the second reverse osmosis membrane element sample 15b, It flows into the intermediate non-permeable water pipe 55.

According to FIG. 3, the first permeate water collection pipe 19a of the first reverse osmosis membrane element sample 15a and the second permeate water collection pipe 19b of the second reverse osmosis membrane element sample 15b are sealed by the sealing means 30. Since the permeated water flowing through both of the water collection pipes is blocked, the first permeated water obtained from the first permeated water pipe 22 is affected by the second permeated water collected in the second permeated water collection pipe 19b. Therefore, the second permeated water is not affected by the first permeated water collected in the first permeated water collecting pipe 19a. Therefore, for example, the first reverse osmosis membrane element sample 1
The salt exclusion performance or organic matter removal performance of 5a is obtained by measuring the electrical conductivity or TOC of the analyte liquid and the electrical conductivity or TOC of the first permeated water, and at the same time,
The salt exclusion performance or organic matter removal performance of the second reverse osmosis membrane element sample 15b is determined by the electrical conductivity or TO of the intermediate non-permeable water.
It is determined by measuring C and the electric conductivity or TOC of the second permeate. Further, for example, the water production performance of the first reverse osmosis membrane element sample 15a is the first under the predetermined measurement conditions.
It is determined by measuring the flow rate of permeated water, and at the same time, the water producing performance of the second reverse osmosis membrane element sample 15b is
It is determined by measuring the flow rate of the second permeate under a predetermined measurement condition. In addition, for example, the element differential pressure of the first reverse osmosis membrane element sample 15a is obtained by measuring the supply pressure of the sample liquid and the pressure of the intermediate non-permeate water, and at the same time, the element pressure difference of the second reverse osmosis membrane element sample 15b. The element differential pressure is obtained by measuring the supply pressure of the intermediate non-permeated water and the pressure of the non-permeated water. Further, for example, the salt exclusion performance or the organic matter removal performance of the first reverse osmosis membrane element sample 15a is determined by the electrical conductivity or TOC of the sample liquid and the first
It is determined by measuring the electric conductivity or TOC of the permeate, and at the same time, the second reverse osmosis membrane element sample 1
The element differential pressure of 5b is obtained by measuring the supply pressure of the intermediate non-permeate water and the pressure of the non-permeate water. In addition,
When the intermediate non-permeable water outlet 33 is not provided, for example, a value obtained by subtracting the first permeated water amount from the flow rate of the sample liquid is set as the intermediate non-permeated water flow rate, and this calculated value may be used as a reference value for measurement.

The reverse osmosis membrane element whose performance has been evaluated by such a method is thoroughly washed by injecting pure water into the housing, for example, using the same device as described above in the case of performance evaluation before regenerative treatment. Then, regenerative treatment is performed under the conditions determined according to the degree of contamination. Further, in the case of the performance evaluation after the regenerative treatment, after cleaning with pure water, it is determined based on the value of the performance evaluation what kind of reuse destination the regenerated element is to be used.

The performance evaluation device for a reverse osmosis membrane element of the present invention uses two or more of them and is arranged in parallel so that four or more reverse osmosis membrane element specimens can be evaluated simultaneously by one specimen liquid. May be. Further, since the performance evaluation device can be used as a regenerative treatment device as described above, for example, by operating the switching valve, the connection between the housing and the sample liquid pipe is connected to the housing and the pure water supply pipe or the chemical liquid supply pipe. By doing so, it can be used as a performance evaluating device and a regenerating device for the reverse osmosis membrane element.

As described above, according to the reverse osmosis membrane element performance evaluation apparatus 10 of the present invention, although two reverse osmosis membrane element specimens are arranged in series in one housing, they are mutually disposed. Since the permeated water collecting tubes are not common but independent, the individual performances of one analyte liquid can be evaluated separately at the same time.

[0032]

According to the present invention, two reverse osmosis membrane element specimens arranged in series in one housing are
The performance can be individually evaluated simultaneously with one analyte liquid. Therefore, the time required to evaluate the performance of the reverse osmosis membrane element can be shortened. Further, for example, since it is possible to efficiently evaluate the used reverse osmosis membrane element recovered from the reverse osmosis membrane module used in the water treatment facility, regenerative treatment and regeneration which are steps after the recovery of the used reverse osmosis membrane element. It is possible to quickly supply the processed products.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a structure of a performance evaluation device for a reverse osmosis membrane module according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a joined state of an end plate of a housing and a permeated water collecting pipe of a reverse osmosis membrane element.

3 is a diagram illustrating a performance evaluation method using the performance evaluation device of FIG.

FIG. 4 is a partially cutaway vertical sectional view showing the structure of a conventional reverse osmosis membrane module.

5 is a vertical sectional view taken along the line AA of FIG.

[Explanation of symbols]

10 Reverse osmosis membrane element performance evaluation device 11a, 11b, 81 Reverse osmosis membrane 14,84 Telescope stop 15a First reverse osmosis membrane element sample 15b Second reverse osmosis membrane element sample 16,86 housing 18,88 Brine seal 19a First permeated water collection pipe 19b Second permeate water collection pipe 20 End plate 21 Sample liquid inlet 22 1st permeate pipe 23 First permeate outlet 24 Non-permeate water outlet 25 Second Permeate Water Pipe 26 Second permeate outlet 30 sealing means 41 Flowmeter 42 pressure gauge 43 Conductivity meter 44 TOC meter 51 Subject Liquid Tube 53 Non-permeable water pipe 55 Intermediate non-permeable water pipe

Claims (4)

[Claims] 1. A non-permeate water flow connected to a sample liquid pipe and a first permeate water outlet connected to a first permeate water pipe at one end side, and a non-permeate water flow connected to a non-permeate water pipe at the other end side. A first reverse osmosis membrane having a housing having an outlet and a second permeate outlet connected to the second permeate pipe, and a first permeate water collecting pipe having an opening at one end connected to the first permeate outlet connected to the housing. A second reverse osmosis membrane element having an element sample and a second permeated water collecting pipe which is loaded in the housing and is arranged in series with the first reverse osmosis membrane element sample and has an opening at one end connected to the second permeated water outlet. A sample, and the opening at the other end of the first permeated water collection pipe and the opening at the other end of the second permeated water collection pipe are both sealed by a sealing means, and two reverse osmosis are performed with one analyte liquid. Characterized by simultaneous performance evaluation of membrane element specimens Reverse osmosis membrane element performance evaluation device. 2. The sealing means is a coupling means comprising a shield part for blocking the mutual permeation of the permeated water flowing through the first permeated water collecting pipe and the second permeated water collecting pipe from each other. The first permeate water collecting pipe and the second pipe
2. The performance evaluation device for a reverse osmosis membrane element according to claim 1, wherein both openings at the other end of the permeated water collecting pipe are each sealed with an end cap. 3. The reverse osmosis membrane according to claim 1, wherein an intermediate non-permeate water outlet port through which the non-permeate water of the first reverse osmosis membrane element sample flows out is provided at the center of the housing. Element performance evaluation device. 4. The first reverse osmosis membrane element sample and the second reverse osmosis membrane element sample are both used reverse osmosis membrane elements, according to any one of claims 1 to 3. Reverse osmosis membrane element performance evaluation device.