JPH05157680A - Device for testing performance of separation membrane - Google Patents

Abstract

PURPOSE:To obtain a device which is suitable for testing the performance of separation membranes used for the reverse osmosis method, ultrafiltration method, and precision filtration method. CONSTITUTION:The title device is composed of a container main body 1, cap body 14, and membrane surface covering mechanism and the covering mechanism is composed of a supporting body 3, separation membrane 4, member 5 for sealing the outer peripheral section of the film 4, member 10 for sealing the central part of the film 4, stirrer 9, and membrane fixing frame body 6. The outer peripheral edge section of the membrane 4 is pressed against and fixed to the supporting body 3 by means of the outer peripheral frame section of the frame body 6 through the member 5 and the member 10 and stirrer 9 are coaxially supported by the frame body 6. The central part of the membrane 4 is pressed against and fixed to the supporting body 3 by means of the shaft section of the frame body 6 and a liquid contact section having a ring-like surface is provided between the members 5 and 10.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an inorganic substance [for example, an inorganic substance such as iron, insoluble silicon, aluminum hydroxide and calcium carbonate] and an organic substance [for example, starch,
Organic substances such as proteins, vitamins, molds, fungi and lignin] Solvents and solutes of solutions containing solutions, especially cell culture medium containing colloidal components Soybean flour or soybean oil added as a nutrient source that is present in the culture solution and valuable substances generated by the bacterial cells and other colloidal components (liquid)) and various industrial waste liquids (for example, starch second-site wastewater (starch, etc.), Electro-deposition paint rinsing drainage (paint etc.), textile processing drainage (lanolin,
Separation membrane performance test device suitable for performance tests of separation membranes used in reverse osmosis method, ultrafiltration method and microfiltration method for separating solvent and solute or suspended substance in various industrial wastewater such as dye) The accuracy and speed of the performance of separation membranes for solution treatment, which has been increasing in use in recent years,
It is intended to contribute to the development of new effective separation membranes, improvement of existing separation membranes, and selection and expansion of optimum fields of use.

[0002]

2. Description of the Related Art A conventional performance tester for a separation membrane for solution is
As shown in FIG. 4, the test solution on the surface of the membrane is flowed mainly by rotating the rod-shaped stirrer 31 suspended above the membrane surface of the circular separation membrane 30 to be tested at a predetermined interval. This is a method of testing the membrane performance while performing the above. However, in the separation membrane performance testing device of this system, as shown in FIG.
In order to generate a spiral liquid flow on the surface of the circular separation membrane,
There is a problem that the flow rate of the test solution is significantly different between the central part and the outer peripheral part of the film. That is, since the suspended substance remains in the center of the membrane, the membrane performance changed with the lapse of the test time, and the membrane performance could not be accurately determined.

There is also known a device for testing the membrane performance so that suspended matter does not stay in the central portion of the membrane surface. In this device, as shown in FIG. 6, one or a plurality of discharge ports 33 are arranged at a predetermined interval in the center of the circular separation membrane, and a test is performed from these discharge ports 33 using a liquid feed pump. A solution is discharged, and as shown in FIG. 7, the membrane performance is tested while radially flowing the test solution from the center of the membrane toward the outer periphery of the membrane. However, in this method, as shown in FIG. 7, since the test solution is radially diffused from the central portion of the circular test separation membrane toward the outer peripheral portion, the test solution moves from the central portion of the membrane to the outer peripheral portion. The liquid flow velocity decreases as the temperature rises. Therefore, the liquid flow velocity was not uniform over the entire effective membrane surface, and the amount of membrane permeated liquid was different in each part of the effective membrane surface, so that the membrane performance could not be accurately determined.

[0004]

When a liquid component in a test solution and a turbid component are separated using a separation membrane, the turbid component stays near the surface of the separation membrane as the liquid component permeates through the membrane. A concentration gradient is created, which causes the performance of the separation membrane to vary significantly over time. Therefore, in order to accurately judge the performance of the separation membrane, it is an indispensable condition that the test solution is made to flow uniformly in the same direction at the same speed in the liquid contact portion of the separation membrane under test, that is, the entire effective membrane surface. Becomes However, by rotating the stirrer installed in the center of the circular separation membrane, a device that causes the test solution to flow in a spiral shape, or a method that discharges the test solution from the center of the circular separation membrane and causes it to flow radially In any of the above devices, the liquid flow velocity is significantly different between the central part of the membrane and the other part, and the above-mentioned requirements cannot be satisfied.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems in the conventional device described above.
The separation membrane performance testing device of the present invention comprises a container body, a lid, and a membrane surface coating mechanism interposed between the container body and the lid. The membrane surface coating mechanism includes a support, a separation membrane, a separation membrane outer peripheral sealing member, and a separation membrane. A membrane central portion sealing member, a stirrer and a membrane fixing frame body, and an outer peripheral end portion of the separation membrane is attached to the support at the outer peripheral frame portion of the membrane fixing frame body via the separation membrane outer peripheral sealing member. The separation membrane central portion sealing member and the agitator are coaxially supported by the membrane fixing frame body, and the separation membrane central portion is pressed and fixed to the support body by the shaft portion of the membrane fixing frame body. The liquid contact portion of the annular surface is set between the separation membrane outer peripheral sealing member and the separation membrane central sealing member, and the liquid contact portion of the annular surface is
A flow is formed along the circumference by the stirrer, the container body has a circular recess, and a water collecting pipe reaching the outside of the container body is provided on the bottom surface of the recess, and the lid body is connected to the outside. It is characterized by having a through hole.

[0006]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side sectional view of a membrane performance test apparatus showing an embodiment of the present invention, FIG. 2 is an enlarged perspective view of constituent members of the apparatus shown in FIG. 1, and FIG. 3 is a usage example of the apparatus shown in FIG. Is shown.

In FIG. 1, the container body 1 is a cylindrical container made of a pressure-resistant and corrosion-resistant material, and the upper surface is a flange having a structure capable of finding the O-ring 15. A cylindrical groove is formed on the bottom.
Further, a water collecting pipe 7 extending to the outside of the container body is communicated with the bottom surface of the groove, and a large number of narrow grooves 2 having a width of 1 mm and a depth of 1 mm, for example, are crossed with each other in the vertical and horizontal directions. .. Therefore, the membrane-permeated liquid can be easily and promptly guided to the outside of the container body 1 and collected. In contact with the upper surface of the narrow groove 2, a support 3 having water permeability, such as a porous stainless plate, in contact with the upper surface of the support 3, a separation membrane 4, and in contact with the outer peripheral upper surface of the separation membrane 4, For example, gaskets 5 made of a base material having corrosion resistance such as fluorine resin and having sufficient elasticity to press and fix the separation membrane are installed. Further, there is a film fixing frame body 6 made of the same material as the container body 1 in contact with the upper surface of the gasket 5, and is fixed to the container body 1 by a set screw 8. Furthermore, it has a built-in magnetic material, and it has corrosion resistance such as fluorine resin.
The separation member central part sealing member 10 is provided with a stirrer 9 made of a base material having abrasion resistance through a through hole formed in the central part.
It is fitted so that it can rotate smoothly. The separation membrane central sealing member 10 has an insertion hole 11 in the central portion of the membrane fixing frame 6.
The membrane fixing frame 6 so that the bottom surface of the separation membrane central sealing member 10 is closely attached to the center of the upper surface of the separation membrane 4.
It is pressed and fixed by a set screw 12 from the top of the head.

Thus, the gasket 5 and the membrane central sealing member 10 provide liquid-proof sealing between the upper surface of the outer peripheral end and the upper surface of the center of the separation membrane 4, and the upper surface of the membrane 4 in contact with the liquid, that is, the effective membrane. The surface becomes an annular surface. Further, the stirrer 9 containing a magnetic material is magnetically guided from the outside of the bottom surface of the container body 1 by using a rotation transmitting means such as an electromagnetic stirrer 24 with the central projection axis of the membrane central portion sealing member 10 as the central axis. The test solution injected into the container body 1 can be easily rotated at an arbitrary speed, and along the circumference of the annular surface formed on the upper surface of the separation membrane 4 in the same direction at the same flow rate. It can be made to flow uniformly. In addition, at either one of the lower end portions of the stirrer 9, a membrane central sealing member is provided.
An agitating blade 13 having a size slightly smaller than the cross-sectional size of the rectangular gap formed by the outer peripheral surface of the substrate portion 10, the inner peripheral surface of the gasket 5, and the annular surface of the separation membrane 4 is provided. The stirring blade 13 has a function of efficiently flowing the test solution in the vicinity of the effective membrane surface in a certain direction as the stirring bar 9 rotates. Furthermore, the constituent base material of the stirring blade 13 is usually a corrosion-resistant metal plate or resin plate, but by stretching a cleaning member made of a soft material such as sponge at the lower end of the base material, It has the function of not only the flow action of the test solution but also the action of cleaning the membrane surface.

On the upper surface of the container body 1, a lid body 14 made of the same material as that of the container body 1 is clamped via an O-ring 15.
The test solution and pressure fluid can be prevented from leaking out of the container, and the two can be combined and separated very easily, making it easy to inject and discharge the test solution. it can. Further, on the upper surface of the lid body 14, there are provided through holes 17, 18, 19 to the outside of the container so that, for example, the fluid introducing pipe 20, the fluid outlet pipe 21, the pressure gauge 22 or the opening / closing valve can be connected with a screw through a joint. It has an opening.

FIG. 2 shows each component of the separation membrane performance testing device shown in FIG. 1 in the assembling order. As is apparent from FIG. 2, assembling and disassembling in the separation membrane performance testing device according to the present invention. Since the work can be performed very easily, not only the internal cleaning operation of the container body 1 but also the exchange operation of the separation membrane 4 can be easily and promptly performed. Therefore, the performance test of the separation membrane can be rapidly repeated.

FIG. 3 shows an example of use of the separation membrane performance testing device shown in FIG. 1, in which the separation membrane to be tested is mounted on the container body 1 and the test solution is injected and sealed. Then, the stirring bar 9 is rotated at a predetermined speed by magnetic induction from the outside by using a rotation transmission means installed outside the bottom surface of the container body 1, for example, an electromagnetic stirrer 24 or the like, and the test solution is allowed to flow, while introducing the inlet 17 A pressurized fluid is introduced from above to pressurize the test solution to a predetermined pressure. The membrane permeate may be collected in the collector 27, weighed and analyzed. In addition, from the introduction hole 17 to the container body 1
As the pressure fluid for introducing pressure into the test solution and transmitting the pressure to the test solution, pure water is usually used under pressure, but preferably the same solvent as the test solution, and more preferably the test solution is treated with a separation membrane. It is preferred to pressurize the membrane permeate before use.
When the pressure fluid is pressurized with a solvent of the same type as the test solution or a membrane permeate, the solute concentration or colloid component concentration or turbid component concentration of the test solution in the container body 1 is always kept constant. This makes it possible to stably judge the membrane performance under the same conditions regardless of the elapsed test time. The pressure fluid used as a pressure transmitting medium is a predetermined fluid stored in a storage tank 23 made of a pressure-resistant and corrosion-resistant base material and pressurized to a predetermined pressure with an inert gas such as nitrogen gas. You can use it.

Table 1 shows an example of the results of the membrane performance test by the separation membrane performance test apparatus and the conventional method apparatus in the above embodiment.

The separation membrane used for the test is an ultrafiltration membrane of a polysulfone material (fraction molecular weight: 50,000) which is usually used, and the test solutions are distilled water and lake water (hydrogen ion concentration 7.5, turbidity). 5.0, calcium carbonate 80mg / L, iron 0.1
mg / L, silicic acid 11.8 mg / L, SS component 45.4 mg / L) were used. The test conditions were the same for both, the liquid temperature was 20 ° C, the operating pressure was 0.5 kg / cm ² , and the average flow velocity on the film surface of the test liquid was 1.0 m.
In the membrane performance test, the membrane permeated liquid was sampled every hour after the separation membrane was sufficiently stabilized and measured. As a result, in the membrane permeation test with distilled water that does not involve the flow velocity of the test solution on the membrane surface, this method is 125.83 L / m ² · hr, and the conventional method is 125.83 L / m ² · hr.
It was 84 L / m ² · hr, and the membrane permeation performance values were almost the same in both cases, but in the test with lake water, in the conventional method in which the flow velocity of the test liquid on the outer peripheral portion and the central portion of the effective membrane surface is different. The membrane permeate flow rate always has a low value, and it has a drawback that a steady value cannot be obtained because the value decreases as the test time elapses.

On the other hand, the test results by this method show that the membrane permeate flow rate is always a constant value as shown in Table 1, and this tendency tends to occur in other test solutions, for example, solutions containing turbid components such as baker's yeast aqueous solution and starch aqueous solution. Since similar results were obtained also in the above, the separation membrane performance testing device according to the present invention has an advantage that stable membrane performance test values can be obtained for a long time.

[0015]

As described above, in the separation membrane performance testing device of the present invention, the liquid contact portion of the separation membrane to be tested, that is, the effective membrane surface is an annular surface, and the test solution is looped along the annular surface. By moving the test solution, it is possible to flow the test solution uniformly at the same speed and in the same direction over the entire effective film surface, so that the film performance can be accurately determined and the test can be performed over the entire effective film surface. Since the solution flows uniformly, there is an advantage that non-uniform fouling that occurs on a part of the effective membrane surface can be prevented as in the conventional method, and the performance test of the separation membrane can be stably performed for a long period of time.

Further, if the test is carried out by introducing a pressure fluid, for example, a solvent of the same kind as the test solution or a membrane permeate, using the through hole 17 which is a part of the constituent elements of the separation membrane performance testing device, Without changing the test solution concentration over time,
It has the advantage of being able to accurately determine the membrane performance over a long period of time, and does not require the expensive liquid feed pump and complicated piping equipment required to maintain the concentration of the test solution as in the conventional method. It is also advantageous. In addition, by attaching a cleaning member to the stirring blade 13 which is a part of the constituent elements of the separation membrane performance testing device, it becomes possible to clean the surface of the separation membrane which cannot be achieved by the conventional method.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a separation membrane performance testing device.

FIG. 2 is an assembly and exploded view of each component and device of the separation membrane performance testing device.

FIG. 3 is an explanatory diagram showing a usage example of a separation membrane performance testing device.

FIG. 4 is an explanatory diagram showing an example of a conventional separation membrane performance testing device.

5 is an explanatory diagram showing a liquid flow in the separation membrane performance testing device shown in FIG.

FIG. 6 is an explanatory diagram showing another example of a conventional separation membrane performance testing device.

FIG. 7 is an explanatory view showing a liquid flow in the separation membrane performance testing device shown in FIG.

[Explanation of symbols]

 1 Container Main Body 2 Narrow Groove 3 Support 4 Separation Membrane 5 Gasket 6 Membrane Fixing Frame 7 Water Collection Tube 9 Stirrer 10 Membrane Center Sealing Member 13 Stirring Blade 14 Lid 17 Conduction Hole 18 Conduction Hole 19 Conduction Hole

Claims (2)

[Claims] 1. A container main body, a lid, and a membrane surface coating mechanism interposed between the both, wherein the membrane surface coating mechanism comprises a support, a separation membrane, a separation membrane outer peripheral sealing member, and a separation membrane central sealing member. , A stirrer and a membrane fixing frame, the outer peripheral end of the separation membrane is pressed and fixed to the support by the outer peripheral frame of the membrane fixing frame via the separation membrane outer peripheral sealing member, The separation membrane central portion sealing member and the stirrer are coaxially supported by the membrane fixing frame body, and the separation membrane central portion is pressed and fixed to the support body by the shaft portion of the membrane fixing frame body. A liquid contact part of the annular surface is set between the outer peripheral sealing member and the separation membrane central part sealing member, and the liquid contact part of the annular surface forms a flow along the circumference by the stirrer. , The container body has a circular recess, the bottom surface of the recess A separation membrane performance testing device, characterized in that a water collecting pipe reaching the outside of the container main body is provided in the portion, and the lid body has a conducting hole to the outside. 2. The separation membrane performance testing device according to claim 1, wherein a membrane surface cleaning member is disposed at one end of the stirring bar so as to be in contact with and slidable with the membrane surface.