JP3286344B2 - Filtration element and liquid treatment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration element for precisely separating fine particles and suspended substances from a solution containing various fine particles and suspended substances, and a liquid using the same. The present invention relates to a processing device.

[0002]

2. Description of the Related Art Conventionally, in the purification treatment of clean water and sewage, sedimentation using a flocculant, sand filtration, etc. have been used to remove various fine particles and suspended substances contained in a stock solution. . The main purpose of sedimentation separation is to obtain a clear liquid and to obtain thick particles and suspended solids (sludge). Sand filtration or the like is performed for the purpose of further purifying a clear liquid (supernatant) obtained by sedimentation. On the other hand, sludge is further concentrated by various filtration methods using a filter cloth or the like, and further dried and treated by heating or incineration. In addition, not only in the case of clean water and sewage, but also in general, a filter medium such as filter cloth, filter paper, diatomaceous earth and the like is used for filtering a solution containing various fine particles, microorganisms and suspended substances.

[0003]

In the treatment of tap water and sewage, obtaining a more purified treatment liquid has been increasingly regarded in recent years from the viewpoint of environmental protection. In addition, by further removing the water contained in the sludge separated by sedimentation, etc., it is considered to obtain a thicker sludge, reduce the burden of the subsequent processing, and improve efficiency,
Also in this case, it is required that the removed water be more purified. In general, filtration of a liquid containing a large amount of various fine particles or suspended substances, for example, more precise filtration and separation of a culture solution of microorganisms, etc. has been required.

[0004] However, the above-mentioned filtration using a filter medium such as sand filtration or filter cloth is a coarse filtration, which can remove a large amount of relatively large particles and suspended substances, but has low filtration accuracy and minute particles. However, there is a problem that leakage of suspended substances is inevitable. Also, in a filter medium such as filter cloth and filter paper, particles easily enter the filter medium, and it is difficult to remove the particles that have entered even when the filter medium is washed, etc., and the filter performance gradually decreases due to clogging. Problem.

In order to concentrate sludge such as sludge, a belt press using a belt-shaped filter cloth, a cylindrical rotary dehydrator, and the like are used as devices capable of continuously performing filtration. The purpose is to collect sludge, and there is a problem that a precise filtrate cannot be obtained as described above.

[0006] In a microfiltration method using a controlled porous filtration material having fine pores of a pore size of 1 µm or less, it is possible to perform filtration with high accuracy that solves the above problem. However, the microfiltration method is mainly used when the concentration of particles and suspended substances in a stock solution is relatively low. This is because the fine pores of the filter medium are extremely fine compared to the opening of the filter cloth and the like, and when a stock solution containing a large amount of particles and suspended substances is treated, they are immediately accumulated and deposited on the surface. This is because a layer is formed and the filtration rate is rapidly reduced.

[0007] Therefore, in order to filter the stock solution containing a large amount of particles and suspended substances as described above by a microfiltration method, a study has been made from the viewpoint of a filtering operation method. By using cross-flow filtration, which performs filtration while forming a filter, it is possible to reduce the formation of a deposited layer such as particles on the surface of the filter medium, and it is possible to adapt to filtration of a stock solution having a relatively high particle concentration. I understand, and it is now partly used.

However, in the cross-flow filtration, in order to perform filtration, it is necessary to configure a stock solution supply system (a stock solution circulation path) for constantly forming a stock solution flow on the surface of the filter medium. To increase it, increase the circulation flow rate or install some structure on the surface of the filter medium,
It is necessary to make settings so that the stock solution flows at a higher flow rate. Therefore, it is easy to set up and install the system, and it is an effective means of filtration for applications where the processing volume is small, such as filtration of a very small amount in a laboratory or purification of a high-value-added stock solution even in a small amount. For large-scale systems such as water and sewage treatment, it is necessary to set up complicated and large-scale equipment for supply and control of undiluted solution, resulting in problems such as large power and management. is there. Further, it could not be applied to a stock solution having a particle concentration and a viscosity at which a flow required for cross-flow filtration could not be formed.

[0009] In view of the above problems, the present inventors have
A diligent study was conducted on a filtration element and a filtration device using a microfiltration method capable of efficiently processing a stock solution containing a large amount of particles, suspended substances, and the like. Japanese Patent Application Nos. 2-88699 and 2-2.
As a result, a filter element and a device having a structure capable of easily removing deposits (sludge) such as suspended substances adhered to the surface of the filter element as shown in 99156 or the like were obtained. Although these were extremely effective, they were basically batch processes in which filtration was performed intermittently, and a more efficient system capable of performing continuous filtration for a long time was desired. The present invention solves the problems of coarse filtration and microfiltration with a filter material such as the filter cloth,
It is an object of the present invention to provide a filtering element and a liquid processing apparatus capable of more accurately and continuously performing the liquid filtering process continuously for a long period of time.

The filter element of the present invention has a rotatable central shaft portion having a liquid flow path therein, and a support extending radially from the central shaft portion having a flow path communicating with the liquid flow path. A plurality of hollow fiber-shaped filters arranged in a direction surrounding the periphery of the central shaft portion and at least partially supported by the support structure, and a filtrate outflow portion being liquid-tightly connected to the channel. and a filtration unit comprising a membrane, the filtration unit
Is substantially equal to the plane of rotation formed by the support structure.
Are arranged in parallel . By doing so, it is possible to obtain a filtration element capable of efficiently filtering the stock solution. This filter element is configured to be capable of performing stable rotation, the center of gravity is not extremely deviated with respect to the central axis, and a strong force or vibration is strongly applied to the central axis portion due to the rotation of the filter element. The structure that does not act, the resistance of the liquid generated to the filter element by the rotation of the filter element is not uneven, and when the filter element is rotated, similarly strong irregular force or vibration acts on the central axis. The configuration is such that it is not performed.

[0011] Further, the filtering element, a bearing mechanism for the central shaft of the filtering element, a rotating mechanism for rotating the central shaft, a collecting mechanism for collecting a filtrate from the liquid flow path of the central shaft, A liquid that has solved the above problem by having a holding structure that holds at least a part of the filtration unit of the element so as to be immersed in the undiluted solution, and configuring an apparatus that performs filtration while rotating the filtration element during filtration. A processing device can be provided.

[0012]

FIG. 1 is a partial sectional view showing a first embodiment of a filter element of the present invention in which a hollow fiber filter membrane is used as a porous filter. Based on this, the operation of the present invention will be described. The support structures 2a and 2b are installed radially from the central shaft portion 1. The filtration unit 3 is a hollow fiber-shaped filtration membrane 4
And a fixing structure 5 that fixes and fixes the end face of the hollow fiber-shaped filtration membrane 4 and a fixing ring 6. The support structure 2a is provided with a flow path 9 which communicates with the liquid flow path 10 of the central shaft 1 in a liquid-tight manner.

The fixed structure 5 is formed with an opening of a hollow fiber filter membrane 4 as a filtrate outlet of the filtration unit 3, and the opening is formed by a fixing ring 6 in the support structure 2.
a, and is fluid-tightly connected to the flow path 9 and further communicates with the liquid flow path 10 via the flow path 9 in a liquid-tight manner. The filtration unit comprises a support structure 2
a, and is supported from the center shaft 1 side by a support structure 2b at a portion of the filtration membrane 4 in the form of a hollow fiber.

The filtration of the stock solution is carried out as follows. At the time of filtration, the stock solution 7 is supplied to the outside of the hollow fiber-shaped filtration membrane 4, and the filtrate 8 that has passed from the outside to the inside of the hollow fiber-shaped filtration membrane 4 is
It flows out from the opening of the hollow fiber-shaped filtration membrane 4 formed in the fixed structure 5 to the flow path 9 formed in the support structure 2a. Then, the liquid flows out of the filtration element from the liquid flow path 10 of the communicating central shaft portion. At this time, filtration is performed while rotating the filtration element about the central shaft portion 1. By rotating the filter element in this manner during filtration, a flow of the stock solution occurs in a tangential direction relative to the membrane surface of the hollow fiber-shaped filtration membrane 4, and the adhesion of sludge to the membrane surface can be reduced. Thus, stable filtration can be performed over a long period of time.

Further, even when sludge is gradually attached to the filtration unit due to filtration, as the amount of sludge increases, the force for peeling the sludge from the surface of the porous filtration material by rotation becomes large. So
Sludge removal and separation become easier. Further, it is possible to more effectively obtain the peeling effect when backwashing is performed from the filtrate side.

The filter element does not need to be entirely immersed in the undiluted solution, but only needs to be immersed in about half of the filter element with respect to the central shaft 1. The filter unit is immersed in the undiluted solution by rotation. Is enough. Further, in this case, the effect of peeling off the attached sludge can be obtained by contact stirring with the liquid surface of the undiluted solution.

When the filter element is rotated, it may be reversed not only in one direction but also at appropriate intervals. By doing so, the effect of stirring the undiluted solution is generated, and the effect of preventing the adhesion of sludge and the effect of removing sludge can be enhanced.

Further, the liquid processing apparatus of the present invention is configured to perform filtration while rotating the filtration element using the filtration element. That is, at least a mechanism for rotating the central shaft of the filtration element, a mechanism for rotating the central shaft, and collecting the filtrate from the liquid flow path of the central shaft while the rotation of the central shaft is blocked from the outside. It is configured to have a collecting mechanism, and further to have a holding structure for holding the filtration element so that at least a part of the filtration unit of the filtration element is immersed in the undiluted solution. By using the device configured as described above, more efficient microfiltration that solves the above problem can be continuously performed.

According to the present invention, the same effect can be obtained without installing a circulation circuit or a mechanism for forming a fast flow of the undiluted solution on the surface of the porous filtration material which has been required for the conventional cross-flow filtration. it can. In addition, liquids containing particles and suspended substances that cannot be circulated can be treated.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in further detail based on other embodiments. FIG. 2 shows a second example of the filter element of the present invention.
It is the perspective view which showed the Example of FIG. FIG. 3 is a side view showing a third embodiment, and FIG. 4 is a partial sectional view showing a fourth embodiment in the same manner. FIG. 5 is a perspective view showing a fifth embodiment, and FIG. 6 is a partially exploded view of a part of the fifth embodiment. FIG. 7 is a perspective view showing the sixth embodiment, and FIG. 8 is a perspective view showing the seventh embodiment. FIG. 9 is a perspective view of an embodiment in which a plurality of filtration elements are further connected. FIG. 10 is a schematic view showing an embodiment of the liquid processing apparatus of the present invention, and FIGS. 11 and 12 are schematic views showing another embodiment of the liquid processing apparatus. FIG. 13 is a partial cross-sectional view showing the filter element of Comparative Example 1 used in the experiment, and FIG. 14 shows a graph of the experiment result.

FIG. 2 shows a second embodiment in which a hollow fiber filter membrane is used as a filtering material. A supporting structure 2a is installed in two directions from a central shaft 1 and fixing rings are provided at both ends. 6, two filtration units 3 are connected. As shown in the figure, an arcuate support body 11 is installed from the vicinity of the connection part of the filtration unit 3 of the support structure 2a, and the hollow fiber membrane 4 is held in a state of being stretched from the central shaft side. is there. By doing so, it is possible to prevent the hollow fiber-shaped filtration membrane 4 from becoming loose or entangled.

Further, it is preferable to provide a blade-like structure 12 as shown in the figure on the side surface of the support structure 2a. When the filtration element is rotated about the central shaft portion 1, the flow of the stock solution 7 occurs tangentially to the surface of the hollow fiber-shaped filtration membrane 4 as described above, and the sludge adheres to the membrane surface. However, the blade-shaped structure 12 allows the undiluted solution 7 to flow into the filtration unit 3 in a faster flow, so that the effect of preventing sludge from adhering can be further enhanced.

FIG. 3 shows a third embodiment in which a plurality of supports 11 and a filtration unit 3 are further provided on a support structure 2a. By doing so, the filtration area of one filtration element can be reduced. It is possible to increase.

FIG. 4 is a partial sectional view showing a fourth embodiment. In the present embodiment, a support structure 2a extending from the central shaft portion 1 is constituted by a plurality of connection structures 13 and end connection structures 14 which are detachably connected in multiple stages. By connecting the connection structures 13, the support structure 2a has an elongated shape, and the flow path 9 communicating therewith is formed. An end connection structure 14 is installed at an end of the connection structure 13. The filtration unit 3 is liquid-tightly connected to each of the connection structure 13 and the end connection structure 14 by the fixing ring 6 via the fixing structure 5. By using the connection structure 13 that can be connected in this way, the number of the filtration units 3 to be installed can be easily changed, and the filtration area of the filtration element can be increased or decreased according to the situation or purpose. Become.

FIG. 5 shows a fifth embodiment.
FIG. 6 shows a partial exploded view of a part thereof. In this embodiment, the support structure 2a is composed of two plate-like members 15 and 16 and the filtration unit 3 is connected to the plate-like member 15 and the plate-like member via the fixed structure 5 at the end. By being sandwiched by the body 16, a flow path communicating with the liquid flow path of the central shaft portion is formed inside the body 16. The filtration units 3 are arranged side by side so as to be fitted into grooves 17 formed in the plate-like body 15 sequentially from the side of the central shaft 1, and thereafter the plate-like body 16 is covered, and the ends are fixed liquid-tight with caps 18. The spaces between the filtration units 3 and between the plate-like body 15 and the plate-like body 16 are sealed in a liquid-tight manner with an adhesive, packing or the like. In the present embodiment, it is possible to install the filtration units 3 close to each other, and it is possible to further increase the membrane area per filtration element. Further, since the plate-shaped member also serves as a component for fixing and supporting the filtration unit, and also as a component of the flow path, the number of components in manufacturing the filtration element is reduced. Also, since the components are basically simple in shape, there is an advantage that parts can be easily manufactured and the cost can be reduced.

The shape of the fixing structure 5 may be a flange-like shape or a shape fitting into a groove as in this embodiment. Can be implemented without being greatly influenced by the type and the shape of the object. Therefore, it is more preferable to connect the filtration unit via the fixed structure 5 in that the shape of the filtration element can be freely set.

It is preferable that the fixed structure 5 is provided with a filtrate outflow portion of a porous filtration material. Fixation of the filtration unit 3 via the fixing structure 5, the filtrate outflow portion of the porous filtration material of the filtration unit 3 and the liquid flow path 10 of the central shaft 1,
The communication between the support structure 2a and the flow path 9 is performed by separate means (for example, a band-like fixing tool is installed on the support 11 as shown in FIG. 3 to thereby fix the filtration unit 3). Fixing the structure 5 part, the filtration unit 3
A method is also possible in which a cap is provided at the filtrate outflow portion formed in the other part of the above, and the cap and the flow path of the support structure 2a are connected in a liquid-tight manner with a flexible tubular communicating part. However, since the filtrate outflow portion is configured in the fixed structure, the fixing of the filtration unit 3 and the connection and fixing for collecting the filtrate can be performed by one mechanism, so that the structure of the filtration element is simple and wasteful. There is an advantage of having a configuration without any.

In the embodiment shown so far, the filtration unit 3
Although the filtrate outflow portion is connected to the support structure 2a, a structure in which the filtrate outflow portion is directly connected to the central shaft portion 1 is also possible. Further, it is more preferable that the filtration unit 3 is detachably connected to the support structure 2a and the central shaft portion 1. When a part of the filtration unit 3 is broken by making the filtration unit 3 detachable, the function as the filtration element can be restored by replacing only this unit part, and the other function of the filtration element can be restored. The components can be used without waste.

FIG. 7 is a perspective view showing a sixth embodiment using a hollow fiber filtration membrane. Two filtration units 3 are installed at both ends of a prism-shaped support structure 2a. The filtration unit 3 is formed by a bundle of band-shaped hollow fiber-shaped filtration membranes 4 at the support structure 2b and at a right angle of 90 degrees. They are connected in a twisted shape. The filtration unit portion of the filtration element has a substantial blade-like shape, and the rotation of the filtration element forms a flow of the undiluted solution relative to the surface of the filtration membrane. 20 are formed, the effects of both are combined, and the effect of preventing the adhesion of sludge can be further enhanced.

[0030]

[0031]

FIG . 8 shows an embodiment in which a plurality of filtration elements are connected in a multiple direction in the direction of the central shaft portion 1. Each filter element is connected in a liquid-tight manner in the axial direction via a connecting portion 21 formed on the central shaft 1. By connecting the filtration elements in this way, it is possible to easily increase the filtration area.

As the filtration element of the present invention, various materials and shapes of porous filtration materials can be used as long as they can form the shape as in the above embodiment. A filtration membrane can be suitably used. This is because the filtration area of the hollow fiber filtration membrane can be made much larger than that of other structures, for example, the case of using a flat filtration membrane because of its shape. The reason for this is that since it has a function as a structure, a complicated membrane support is not required, and the configuration of the filtration element can be simplified. From the above points, it is possible to configure a filtering element that can relatively easily remove the deposited layer that has adhered by an operation such as applying a flow of a fluid to the filtration membrane itself. In addition, in the case of a hollow fiber filtration membrane, filtration can be performed from both the outside and the inside of the membrane. The support is unnecessary, and effective removal can be performed.

The average pore diameter of the fine pores of the porous filter medium to be used is desirably 1 μm or less as described above. When it is more than 1μm, it becomes close to rough filtration using filter cloth or diatomaceous earth,
The advantage of microfiltration is reduced.

FIG . 9 is a schematic view showing an embodiment of a liquid processing apparatus using the filtration element of the present invention. In this device, a filtration element 24 is connected in multiples at a central axis to form a filtration section 25, which is installed in an immersion tank 26. Both ends of the central shaft portion are held by bearing mechanisms 27 provided on the immersion tank wall. A rotation mechanism 30 including a rotation motor 28 and a rotation transmission unit 29 is provided on one of the center shaft portions. A collecting mechanism 31 is provided on the other side of the central shaft portion so that the filtrate can be collected while the rotation of the central shaft portion is blocked from the outside. A storage tank 32 for temporarily storing the filtrate is connected to the collection mechanism 31, and a decompression pump 33 is connected to this tank.

The stock solution 7 is introduced into the immersion tank 26 from the stock solution inlet 34. The immersion tank 26 is provided with a discharge port 35, and is used for discharging a part of the stock solution or discharging sludge or the like accumulated in the immersion tank according to the state of filtration. The filtration is performed by rotating the filtration element 24 of the filtration unit 25 by the motor 28 and discharging the air 36 in the storage tank 32 by the decompression pump 33 to reduce the pressure. The filtrate 8 filtered by the filtration element 24 flows out of the collection mechanism 31 and flows into the storage tank 32. The filtrate 8 stored in a predetermined amount is appropriately discharged from a storage tank according to the purpose. In addition to filtering the storage tank 32 by depressurizing the storage tank 32 with a decompression pump, it is also possible to perform a filtration by installing a pump between the storage tank and the immersion tank.

In the present embodiment, the filtration unit 25 is provided in the immersion tank 26, and the undiluted solution is introduced into the immersion tank to perform filtration. At least a part of the filtration unit constituting the filtration element is immersed in the undiluted solution. The immersion tank itself functions as a holding structure for the filtration element so that the positional relationship is as follows.

A base using an angle is provided, and a filtering element, a bearing mechanism, a rotating mechanism, a filtrate collecting mechanism, and the like are mounted at predetermined positions on the mounting base to form an integrated device, which is installed at a place where the stock solution is stored. It is also possible to carry out filtration by installing. For example, when water from a lake or the like is used as a stock solution, the above-described apparatus is installed so that a part of the filtration unit portion of the filtration element is immersed directly in the lake or the like to perform filtration. In this case, the gantry functions as a holding structure for holding a part of the filtration unit of the filtration element so as to be immersed in the undiluted solution. As described above, in the case of a device using a gantry, the configuration is compact because there is no need to install an immersion tank, and it is easy to install the device very close to the place where the necessity of filtration occurs. Become. It is also possible to use a movable structure. Alternatively, there is an advantage that an already installed sedimentation basin or the like can be used as a kind of immersion tank, and a configuration without waste can be achieved.

As described above, the effect obtained particularly when the immersion tank is not provided is particularly advantageous when it is premised that the filtrate obtained mainly by filtration is used. When collecting and utilizing solids such as sludge and the like, it is desirable to install an immersion tank as in the previous embodiment and perform concentration in this portion. In any case, it is preferable that the filter unit is installed so that a place where the undiluted solution is not immersed in the filter unit portion when the filter element is rotated does not waste the filtration area.

The immersion tank 26 may be a sealed container that houses the entire filter element, and the inside may be pressurized for filtration. In this case, the filtration pressure can be increased as compared with the case of reduced pressure filtration, so that the filtration speed can be increased.

FIGS. 10 and 11 show another embodiment of the liquid processing apparatus of the present invention in which a plurality of connected filter elements are installed in a dipping tank as a filter section. It is provided with a stirring mechanism for the stock solution. In the embodiment shown in FIG. 10 , a blade-like structure 37 is provided as a stirring mechanism at a central shaft portion between the filtration elements 24, and the relative concentration of the undiluted solution with respect to the surface of the porous filtration material by the rotation of the filtration elements. In addition to the flow, the flow of the stock solution to the filtration element is formed by the blade-shaped structure 37, and the effects of both are combined to further enhance the effect of preventing sludge from adhering.

In the embodiment shown in FIG . 11 , a circulation line 38 for the undiluted solution in a part of the immersion tank 26 is provided, and an outflow portion 40 is formed in the vicinity of each filtration element 24 to form a stirring mechanism. . The undiluted solution 7 in the immersion tank 26 is pressure-fed in a circulation line 38 by a circulation pump 39 and flows out from an outflow portion 40 as a jet flow to wash the side surface of the filter element 24. By this flow, it is possible to effectively prevent the sludge from adhering by filtration or to effectively remove the adhering sludge. By installing the above-described stock solution stirring mechanism, it is possible to obtain an efficient liquid processing apparatus capable of performing stable filtration for a longer period of time.

An experimental example using the liquid processing apparatus of the present invention will be described below. Experimental Example 1 A filtration element having an effective membrane area of 2500 cm ^{2 having} a configuration shown in FIG. 1 was manufactured using 250 polypropylene-made hollow fiber-shaped filtration membranes (pore diameter: 0.1 μm, outer diameter: 500 μm) as a porous filtration material. . Since this filtration membrane was hydrophobic, a filter membrane subjected to a hydrophilization treatment using a surfactant (Triton X-100) was used. The four filtration elements were connected at the center shaft part to form a filtration part, and a liquid treatment apparatus having the configuration shown in FIG. 9 was manufactured and filtration was performed. As a stock solution, a treatment solution (SS concentration: 2.0%) containing coagulated sediment generated by tap water treatment was used. The filter element is rotated 180 times per minute, and the pressure in the storage tank is -0.8 kg / c
Filtration was performed by reducing the pressure to m ² , and the filtration rate at each filtration time was measured.

Experimental Example 2 A liquid processing apparatus having the same filtration area and configuration as that used in Experimental Example 1 was provided with a circulation line for the undiluted solution, thereby producing a processing apparatus as shown in FIG . Filtration was performed under the same conditions as in Experimental Example 1 while circulating the stock solution and stirring, and the filtration rate was measured.

Comparative Example 1 A protective body 41 having an inner diameter of 15 cm as shown in FIG.
Four bundles each using the same 250 hollow fiber-shaped filtration membranes 4 as those in Experimental Example 1 were installed to produce a filtration element having the same membrane area, and the filtration membrane portion was immersed in a similar stock solution to form a filtrate outflow portion 42. Filtration was performed under the same pressure conditions by communicating with a reduced pressure vessel. The undiluted solution 7 is introduced from the outside of the hollow fiber filtration membrane 4 and flows out as a filtrate 8 from the opening of the hollow fiber filtration membrane provided in the fixed resin 5.

Comparative Example 2 Using a liquid treatment apparatus having the same filtration area and configuration as that used in Experimental Example 2, the inside of the apparatus was filled with the undiluted solution so that all of the filtration elements were in contact with the undiluted solution. Filtration was performed without rotating the filter element while circulating and stirring. The conditions of circulation of the undiluted solution and filtration pressure were the same as those in Experimental Example 2.

FIG. 13 shows the results . In Experimental Examples 1 and 2, the filtration rate was reduced until about 30 minutes after the start of filtration. Speed was maintained. In particular, in Experimental Example 2 in which stirring was performed by the circulation line, a higher filtration rate was maintained. On the other hand, in Comparative Examples, in each case, the filtration rate gradually decreased with the elapse of the filtration time, and only a very small amount of filtrate was obtained two hours after the start of filtration. In Comparative Example 2, although the effect of the flow of the surface of the filtration membrane due to the circulation of the undiluted solution was slightly observed, the effect was not sufficient, and the effect of rotating the filtration element was clearly seen in comparison with Experimental Example 2.

The filter element of the present invention and the liquid treatment apparatus using the same have been described based on the embodiments. Various shapes and configurations other than the above examples may be used without departing from the scope of the invention. Application examples can be adopted.

[0049]

As described above, as described above, the filter element of the present invention,
And by using a liquid processing apparatus using the same, a stock solution containing a large amount of suspended substances such as fine particles, microorganisms, and colloids can be filtered stably and continuously for a long period of time. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a first embodiment of a filtration element of the present invention.

FIG. 2 is a perspective view showing a second embodiment of the filtration element of the present invention.

FIG. 3 is a side view showing a third embodiment of the filtration element of the present invention.

FIG. 4 is a partial sectional view showing a fourth embodiment of the filtration element of the present invention.

FIG. 5 is a perspective view showing a fifth embodiment of the filtration element of the present invention.

FIG. 6 is a partial exploded view of a fifth embodiment of the filtration element of the present invention.

FIG. 7 is a perspective view showing a sixth embodiment of the filtration element of the present invention.

FIG. 8 is a perspective view showing an embodiment in which a plurality of filtration elements of the present invention are connected.

FIG. 9 is a schematic view showing an embodiment of the liquid processing apparatus of the present invention.

FIG. 10 is a schematic view showing another embodiment of the liquid processing apparatus of the present invention.

FIG. 11 is a schematic view showing another embodiment of the liquid processing apparatus of the present invention.

FIG. 12 is a partial cross-sectional view showing a filtration element used in a comparative example.

FIG. 13 is a graph showing experimental results.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Central shaft part 2a, 2b Supporting structure 3 Filtration unit 4 Hollow fiber-shaped filtration membrane 5 Fixed structure 6 Fixing ring 7 Undiluted solution 8 Filtrate 9 Flow path 10 Liquid flow path 11 Supports 12, 37 Blade-like structure 13 Connection Structure 14 End connection structure 15, 16 Plate 17 Groove 18 Cap 20 Flow of undiluted solution 21 Connection part 24 Filtration element 25 Filtration unit 26 Immersion tank 27 Bearing mechanism 28 Motor 29 Transmission unit 30 Rotation mechanism 31 Sampling mechanism 32 Storage Tank 33 Decompression pump 34 Stock solution inlet 35 Outlet 36 Air 38 Circulation line 39 Circulation pump 40 Outflow part 41 Protector 42 Filtrate outflow

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 63/16 B01D 33/00 B01D 63/04

Claims (4)

(57) [Claims] A rotatable central shaft portion having a liquid flow path therein; a support structure having a flow path communicating with the liquid flow path and extending radially from the central shaft portion; A filtration unit comprising a large number of hollow fiber-shaped filtration membranes arranged in a direction surrounding the central shaft portion, at least partially supported by the support structure, and having a filtrate outflow portion liquid-tightly connected to the flow path; Wherein the filtration unit is formed by the support structure.
A filtering element, which is arranged substantially parallel to the plane of inversion . 2. The average pore size of the through-pores of the hollow fiber filtration membrane.
The filter element has a diameter of 1 μm or less,
The filtration element according to claim 1, which is used for filtering a contained liquid. A rotatable central shaft portion having a liquid flow path therein; a supporting structure having a flow path communicating with the liquid flow path and extending radially from the central shaft portion; A filtration unit comprising a large number of hollow fiber-shaped filtration membranes arranged in a direction surrounding the central shaft portion, at least partially supported by the support structure, and having a filtrate outflow portion liquid-tightly connected to the flow path; Wherein the filtration unit is attached to the support structure.
A filtering element disposed substantially parallel to a rotating plane formed by the filter, a bearing mechanism of the central shaft portion of the filtering element, and a rotating mechanism of the central shaft portion; A collection mechanism for collecting a filtrate from a liquid flow path, and a holding structure for holding the filtration element so that at least a part of the filtration unit is immersed in a stock solution, and performing filtration while rotating the filtration element. A liquid processing apparatus. 4. The average pore size of the fine pores of the hollow fiber filtration membrane.
The filter element has a diameter of 1 μm or less and a large amount of suspended substance
4. The liquid processing apparatus according to claim 3, which is used for filtering a contained liquid.
Place.