JP4217281B2 - Septic tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a septic tank in which a hollow fiber membrane module unit used for solid-liquid separation in wastewater treatment is disposed.
[0002]
[Prior art]
In recent years, septic tanks made of FRP have become widespread because septic tanks can be installed at low cost and the construction period can be shortened.
FIG. 1 shows an example of the septic tank made of FRP. Reference numeral 1 in the figure indicates a septic tank. The septic tank 1 has a cylindrical shape made of FRP, and the inside thereof is filled with water to be treated having an effective water depth of 1.6 m or more. Although this septic tank 1 is buried in the ground, a cylindrical manhole 2 is provided on the side surface on the ground side, its tip is opened, and this opening portion is provided on the ground to communicate with the outside. . The outer diameter of the manhole 2 is about 600 mm at the minimum.
[0003]
On the other hand, in addition to these uses, hollow fiber membrane modules that have been widely used for the production of aseptic water, drinking water, highly pure water, air purification, etc., have recently become secondary and tertiary treatments in sewage treatment plants. And solid-liquid separation in septic tanks, solid-liquid separation of suspended suspended solids in industrial wastewater, direct filtration of river water in water treatment plants, filtration of industrial tap water, filtration of pool water, etc. Has been studied in various ways.
Examples of the hollow fiber membrane module used for the treatment of highly polluting water include the hollow fiber membrane module disclosed in JP-A-5-261253, JP-A-6-340, JP-A-6-342, and the like. A hollow fiber membrane module unit in which hollow fiber membrane modules are stacked is shown.
[0004]
FIG. 4 shows an example of a conventional hollow fiber membrane module. The hollow fiber membrane module 10 includes a hollow fiber membrane 30 configured by arranging a plurality of hollow fibers 31, 31. This is roughly constituted by two opposing water collecting pipes 20 provided at both ends of the membrane 30.
[0005]
The water collecting pipe 20 has a cylindrical shape with an internal passage formed therein, and one end thereof is closed, and the other end is provided with a pipe 22 connected to a suction pump (not shown). Furthermore, an opening 21 along the length direction is formed on the side wall of the water collecting pipe 20. The end portion of the hollow fiber membrane 30 is inserted into the opening 21 and is closed with a fixing member to be filled, and the hollow fiber membrane 30 is firmly supported and fixed. That is, as the hollow fiber membrane module 10, both ends of the hollow fiber membrane 30 are supported by the two water collecting pipes 20. In this case, the end portions of the hollow fiber membrane 30 are both ends in the fiber direction of the hollow fiber 31, and both end portions of the hollow fibers 31, 31... become.
[0006]
When suction filtration is performed using the hollow fiber membrane module 10 described above, the hollow fiber membrane module 10 is disposed in a liquid tank to be processed filled with the liquid to be processed, and the pipe 22 is connected to a suction pump. .
When the suction pump is operated, the inside of the hollow fibers 31, 31... Becomes negative pressure, and the liquid to be treated filled in the liquid tank to be treated is sucked into the hollow fibers 31, 31. The filtrate passes through the hollow fibers 31, 31..., Enters the internal passage of the water collecting pipe 20, passes through the pipe 22, and is sucked and discharged by a suction pump.
[0007]
A plurality of hollow fiber membrane modules 10 having such a configuration can be arranged in a water tank to be treated to form a hollow fiber membrane module unit. FIG. 5 shows an example of a hollow fiber membrane module unit in which a plurality of hollow fiber membrane modules 10 are arranged, and the membrane surfaces of the hollow fiber membranes 30 of the plurality of hollow fiber membrane modules 10 are arranged in parallel with each other. It is a thing. By arranging a plurality of hollow fiber membrane modules 10 in this way, the membrane area as a whole can be increased and the processing capacity can be improved.
[0008]
In the hollow fiber membrane module 10, the hollow fibers 31, 31... Are fixed and supported by the water collecting pipe 20 to form the hollow fiber membrane 30, so that the area where the hollow fibers 31, 31. Therefore, it is less likely to be fixed and integrated, and cleaning by an air scrubbing method or the like can easily move water and air along the membrane surface, so that it has an excellent filtration performance.
[0009]
[Problems to be solved by the invention]
With the spread of the above-mentioned FRP septic tank, it is considered that it would be very beneficial to use a hollow fiber membrane module unit having such an excellent filtration capacity as a membrane processing filtration device for an FRP septic tank. In the FRP septic tank, the installation of the filtration device is performed only from the manhole. Therefore, when the wastewater purification process is performed using the hollow fiber membrane module unit, the hollow fiber is accompanied by the installation. The size of the membrane module unit is limited. Also, even if the size is limited, at least 5 tanks (1m ^Three / Day), it must be a filtration apparatus capable of performing a filtration treatment of about a degree, and there is a disadvantage in installing a conventional hollow fiber membrane module unit.
Therefore, the subject of this invention is providing the septic tank made from FRP using the hollow fiber membrane module unit with a high integration rate as a filtration processing apparatus.
[0010]
[Means for Solving the Problems]
In order to solve this problem, in the septic tank according to claim 1, there is provided a hollow fiber membrane module having a hollow fiber membrane constituted by a plurality of hollow fibers and water collecting pipes provided at both ends of the hollow fiber membrane. A plurality of pipes are installed, and both ends of these water collecting pipes are connected to the water collecting header, and are integrated by a column having both ends fixed to the water collecting header and shielding plates provided at both ends of the water collecting header. Turned into A rectangular parallelepiped hollow fiber membrane module unit, wherein the shielding plate is provided on both side surfaces of the hollow fiber membrane module unit in parallel to the hollow fiber membrane. The hollow fiber membrane module unit in which the filtrate that has entered the hollow fiber passes through the internal passage formed in the water collecting pipe and collects water in the water collecting header, and has the size shown below. The hollow fiber membrane module unit configured as described above is disposed in the hollow fiber membrane module so that the water collecting pipe and the membrane surface of the hollow fiber membrane are in the vertical direction.
(A) The length of the unit along the stacking direction of the hollow fiber membrane module is 20 to 500 mm,
(B) The length of the unit along the length direction of the hollow fiber of the hollow fiber membrane module is 100 to 500 mm,
(C) The height of the unit along the length direction of the water collecting pipe of the hollow fiber membrane module is 100 to 1500 mm.
[0011]
And in the septic tank according to claim 2, a plurality of hollow fiber membrane modules having a hollow fiber membrane constituted by a plurality of hollow fibers and water collecting pipes provided at both ends of the hollow fiber membrane are arranged, Both ends of these water collecting pipes are connected to the water collecting header, and are integrated by a column having both ends fixed to the water collecting header and shielding plates provided at both ends of the water collecting header. A rectangular parallelepiped hollow fiber membrane module unit, wherein the shielding plate is provided on both side surfaces of the hollow fiber membrane module unit in parallel to the hollow fiber membrane. The hollow fiber membrane module unit in which the filtrate that has entered the hollow fiber passes through the internal passage formed in the water collecting pipe and collects water in the water collecting header, and has the size shown below. The hollow fiber membrane module unit is configured so that the hollow fiber membrane module has a water collecting pipe along the horizontal direction, and the membrane surface of the hollow fiber is vertically arranged inside the unit.
(A) The length of the unit along the stacking direction of the hollow fiber membrane module is 20 to 500 mm,
(B) The length of the unit along the length direction of the water collecting pipe of the hollow fiber membrane module is 100 to 500 mm,
(C) The length of the unit along the length direction of the hollow fiber of the hollow fiber membrane module is 100 to 1500 mm.
[0012]
In the hollow fiber membrane module unit used in the septic tank according to claim 1 or 2, it is desirable that the hollow fiber membrane is a knitted fabric, and the diffuser tube is fixed and integrated with the hollow fiber membrane module unit. It is desirable.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
FIG. 1 is a schematic configuration diagram of an example of the septic tank of the present invention. This septic tank 1 is a small-sized combined septic tank, and the main body is a tank made of FRP, in which treated water having a water depth of 1.6 m or more is stored. Usually, since the main body of the septic tank 1 is buried in the ground, a cylindrical manhole 2 is provided as an external communication path. In addition, a hollow fiber membrane module unit 51 is installed below the manhole 2 as a membrane separator. At this time, the hollow fiber membrane module unit 51 may be installed in a single stage as illustrated, or a plurality of the hollow fiber membrane module units 51 may be installed vertically.
[0014]
When the hollow fiber membrane module unit 51 is installed in the septic tank 1, and after the septic tank 1 is installed, the apparatus inside the septic tank 1 can be maintained only through the manhole 2. Therefore, the size of the hollow fiber membrane module unit 51 installed inside is adjusted according to the processing amount and installation space.
In general, the smallest manhole has an outer diameter of 600 mm. Therefore, the size of the hollow fiber membrane module unit 51 must be at least insertable into the manhole 2 having an outer diameter of 600 mm. The hollow fiber membrane module unit of the present invention is configured to be installable from a manhole 2 having a minimum outer diameter of 600 mm.
[0015]
FIG. 2 shows an example of a hollow fiber membrane module unit installed inside the septic tank according to claim 1. In this hollow fiber membrane module unit 51, a plurality of hollow fiber membrane modules 11, 11... Are arranged, and the water collecting pipes 23, 23... Of these hollow fiber membrane modules 11, 11. It is installed inside the septic tank so that the membrane surface is along the vertical direction, and is a rectangular parallelepiped that is held and integrated by the water collection header 41, the support column 43, and the shielding plate 44.
[0016]
This rectangular parallelepiped hollow fiber membrane module unit 51 has (A) a unit length of 20 to 500 mm along the stacking direction of the hollow fiber membrane modules 11, and (B) a length of the hollow fibers 32 of the hollow fiber membrane module 11. The length of the unit along the direction is 100 to 500 mm, and (C) the height of the unit along the length direction of the water collecting pipe 23 of the hollow fiber membrane module 11 is 100 to 1500 mm.
[0017]
At this time, the length (A) of the unit is the outer diameter of the water collecting pipe 23, their arrangement interval, the outer diameter of the support 43, the distance between the support 43 and the water collecting pipe 23, the length of the water collecting header 42 and the shielding plate Determined by the thickness of the. Further, the length (B) of the unit is determined by the interval between the water collecting pipes 23 facing the hollow fiber membrane module unit 51, that is, the length of the hollow fiber membrane. Further, the height (C) of the unit is determined by the lengths of the water collecting pipe 23 and the column 43 and the outer diameter of the water collecting header 41. The size of the hollow fiber membrane module unit 51 is determined by appropriately adjusting the sizes of these related ones.
[0018]
As the hollow fiber membrane module 11 used in the hollow fiber membrane module unit 51, one having the same configuration as that shown in FIG. 4 is preferably used.
The hollow fiber membrane module 11 includes a hollow fiber membrane 32 composed of a plurality of hollow fibers, and water collecting pipes 23 provided at both ends of the hollow fiber membrane 32, and is roughly configured.
Various hollow fibers can be used. For example, those made of various materials such as cellulose, polyolefin, polyvinyl alcohol, polymethyl methacrylate, and polysulfone can be used. Among these, a material having a high strength such as polyethylene or polypropylene is preferably used.
[0019]
Although not particularly limited, the outer diameter of the hollow fiber is 20 to 2000 μm, the pore diameter is 0.01 to 1 μm, the void ratio is 20 to 90%, and the membrane pressure of the hollow fiber membrane 32 is 5 to 300 μm. Those are preferred.
Further, the shape of the hollow fiber membrane 32 is not particularly limited as long as the hollow fiber membranes 32 are not fixed and integrated with each other and can be easily fixed to the water collecting pipe 23. However, since it can be easily fixed to the water collecting pipe 23 and an arbitrary membrane area can be configured easily and efficiently, it is preferably used.
[0020]
The water collecting pipe 23 has a cylindrical shape with an internal passage formed therein, and is provided with a pipe at least at one end thereof and communicated with the water collecting header 42. In addition, although the water collection pipe | tube 23 shown to this figure is a cylindrical thing, it is not restricted to this, For example, an external shape may be a square pillar.
Further, an opening 24 along the length direction is formed on the side wall of the water collecting pipe 23. The end of the hollow fiber membrane 32 is inserted into the opening 24 and is closed with a fixing member to be filled, so that the hollow fiber membrane 32 is firmly supported and fixed. That is, as the hollow fiber membrane module 11, both ends of the hollow fiber membrane 32 are supported by the two water collecting pipes 23. In this case, the end portions of the hollow fiber membrane 32 are both ends of the hollow fiber in the fiber direction, and both end portions of each hollow fiber are located in the internal path of the water collecting pipe 23.
[0021]
The water collecting pipe 23 may be made of any material having mechanical strength and durability, and examples thereof include polycarbonate, polysulfone, polyolefin, polyvinyl chloride, acrylic resin, ABS resin, and modified PPE resin. It is desirable to use a hydrocarbon-based resin that can be burned completely without emitting toxic gas by incineration after use.
[0022]
Regarding the size of the water collecting pipe 23, the length is related to the height (C) of the unit of the hollow fiber membrane module unit 51, and the outer diameter is the length of the unit of the hollow fiber membrane module unit 51 (A ). Accordingly, an appropriate size is selected according to the size of the hollow fiber membrane module unit 51. At this time, a material having an outer diameter of 5 to 30 mm, which has a strength required to increase the accumulation rate, has little resistance to the fluid flowing through the internal channel of the water collecting pipe 23 and does not interfere with processing, is preferably used. It is done. Also, the thickness is not particularly limited as long as the above conditions are satisfied.
[0023]
The width of the opening 24 of the water collecting pipe 23 is preferably 30 mm or less, and more preferably 10 mm or less. This is because by narrowing the width of the opening 24, the hollow fibers constituting the hollow fiber membrane 32 can be easily arranged in a line. If the hollow fibers are not aligned and the hollow fiber membrane is disturbed, multiple hollow fibers will be bundled together due to adhesion of sludge, etc., and the surface area as a separation membrane cannot be used effectively, reducing the separation performance. Resulting in.
[0024]
The fixing member filled in the opening portion 24 converges and fixes the hollow fibers of the hollow fiber membrane 32 to the opening portion 24 while maintaining the opening state of the end portion thereof, and the internal path of the water collecting pipe 23 is fixed. It is a liquid-tight partition from the outside, and is formed by filling the opening 24 with a liquid epoxy resin, unsaturated polyester resin, polyurethane, or the like and curing it.
If two or more rows of hollow fiber membranes are inserted and fixed in one opening 24, or two or more openings are formed in one water collecting tube 23, and the hollow fiber membranes are inserted in each of them. If fixed, a plurality of hollow fiber membranes 32 can be formed per one hollow fiber membrane module 11. However, considering the cleaning effect, about two hollow fiber membranes are appropriate.
[0025]
The hollow fiber membrane module unit 51 of the present invention has the above-described hollow fiber membrane modules 11, 11... In parallel, and the membrane surfaces of the water collection tube 23 and the hollow fiber membrane 32 are perpendicular to the water surface of the septic tank. A plurality of water collecting pipes 23, 23... On both sides are connected to a water collecting header 41. At this time, each pipe of the water collection pipes 23, 23... Communicates with the inside of the water collection header 41.
[0026]
The number of these hollow fiber membrane modules 11, 11... Is determined by the integration rate required for the hollow fiber membrane module unit 51. For example, the standard amount of drainage when filtering a 5-person tank is 1m ^Three / Day. The membrane area of the hollow fiber membrane required when performing this filtration treatment is such that the filtration capacity of the hollow fiber membrane used is 0.2 m / day (m ^Three / M ² / Day), 5m ^Three It is. Therefore, the hollow fiber membrane module unit 51 is 5 m ^Three A plurality of hollow fiber membrane modules 11 are arranged so as to integrate the hollow fiber membranes 32 of the membrane area.
[0027]
The water collection header 41 has a plurality of continuous holes for communicating with the pipes of the water collection pipes 23 of the hollow fiber membrane modules 11, 11... And has a passage through which the filtrate passes. The continuous holes are connected to a plurality of hollow fiber membrane modules 11, 11... And are fixed and integrated. In addition, a suction port 42 connected to an external water suction pump is provided in the central portion on the opposite side of the connecting portion. This suction port 42 is provided in the water collection header 41 to which at least the pipe of the water collection pipe 23 is connected.
Examples of this shape include a manifold type that fixes a plurality of hollow fiber membrane modules 11 together, but is not particularly limited as long as the filtrate can be taken out from each of the hollow fiber membrane modules 11, 11.
[0028]
Further, struts 43 are disposed at both ends of the water collection header 41, that is, at the four corners of the hollow fiber membrane module unit 51, to fix the water collection header 23 and to support the hollow fiber membrane module unit 51. By providing the support columns 43, the hollow fiber membrane module unit 51 can maintain sufficient strength.
In addition, plate-like shielding plates 44 are provided in parallel to the hollow fiber membrane 32 on both side surfaces of the hollow fiber membrane module unit 51 provided with the support columns 43.
[0029]
When the air scrubbing cleaning is performed on the hollow fiber membrane module unit 51, the shielding plate 44 does not spread out of the hollow fiber membrane module unit 51 and efficiently and sufficiently hits the hollow fiber membrane 32, thereby smoothly cleaning. It is provided to proceed to. By using this shielding plate 44, the integration rate of the hollow fiber membranes 32 can be increased, and the hollow fiber membrane module unit 51 can be reduced in size.
[0030]
When the filtration process is performed by the hollow fiber membrane module 51, cleaning by air scrubbing is performed so as to remove the sludge adhering to the hollow fiber membrane 32 and increase the filtration treatment rate. Conventionally, in this cleaning, bubbles are diffused by an air diffuser provided below the septic tank, and the hollow fiber membrane is oscillated due to the rising of the bubbles. Sludge adhering to the surface of the hollow fiber membrane is removed by the relative flow of water. In this case, when the hollow fiber membrane module is attached to the diffuser, alignment is performed at the work site.
In the present invention, in order to save this trouble, it is desirable to dispose the diffuser tube below the hollow fiber membrane module unit 51 in advance. If it does in this way, the hollow fiber membrane module unit 51 can be easily installed from a manhole.
[0031]
In using the hollow fiber membrane module unit 51, the hollow fiber membrane module unit 51 installed in the septic tank 1 as described above is connected to a suction pump provided outside by the suction port 42 of the water collection header 41. And suction filtration is performed by operating this suction pump. At this time, the water to be treated is filtered by the hollow fiber membrane 32 of the hollow fiber membrane unit 51, the filtrate passes through the pipe of the water collecting pipe 23, collects water in the water collecting header 41, passes through the suction port 42, and passes through the septic tank 1. Is discharged outside.
[0032]
Moreover, in order not to reduce the filtration rate of the hollow fiber membrane module unit 51 in the septic tank 1, air scrubbing cleaning for removing sludge adhering to the hollow fiber membrane 32 of the hollow fiber membrane module unit 51 is simultaneously performed. In the present invention, the hollow fiber membrane 32 is arranged in the vertical direction with respect to the water surface, and the shielding plates 44 are provided on both sides thereof, so that air bubbles efficiently rise between the hollow fiber membranes 32 in the unit. Therefore, the hollow fiber membrane 32 can be easily washed, the filtration rate of the hollow fiber membrane module unit 51 is not easily lowered, and a good filtration treatment can be performed over a long period of time.
[0033]
FIG. 3 shows an example of a hollow fiber membrane module unit installed inside the septic tank according to claim 2. The hollow fiber membrane module unit 52 is arranged in a plurality of hollow fiber membrane modules 12, 12... So that the water collecting pipes 25 of these hollow fiber membrane modules 12, 12. 33 ... is installed inside the septic tank so that the membrane surface is perpendicular to the water surface, and is a rectangular parallelepiped that is held and integrated by the water collecting header 45, the support column 47, and the shielding plate 48. . The structural member is the same as the hollow fiber membrane module unit 51 shown in FIG.
[0034]
The rectangular hollow fiber membrane module unit 52 has a size of (A) a unit length of 20 to 500 mm along the stacking direction of the hollow fiber membrane modules 12, and (B) a water collecting pipe of the hollow fiber membrane module 12. The length of the unit along the length direction of 25 is 100 to 500 mm, and the length of the unit along the length direction of the hollow fiber 33 of the hollow fiber membrane module 12 is 100 to 1500 mm. ing.
[0035]
At this time, the length (A) of the unit is determined by the outer diameter of the water collecting pipe 12, the arrangement interval thereof, the length of the water collecting header 45, and the thickness of the shielding plate 48. Further, the length (B) of the unit is determined by the length of the water collecting pipe 25 and the column 43 and the outer diameter of the water collecting header 45. The unit height (C) is determined by the outer diameter of the water collecting pipe 25, the distance of the water collecting pipe 25 facing the hollow fiber membrane module unit 52, that is, the length of the hollow fiber membrane 33, and the length of the column 47. . The size of the hollow fiber membrane module unit 52 is determined by appropriately adjusting the sizes of these related ones.
[0036]
In the hollow fiber membrane module unit 52, the suction port 46 of the water collection header 45 is provided in the water collection header 52 so that the opening is upward when the hollow fiber membrane module unit 52 is installed in the septic tank. It is done.
As the water collection header 45, like the hollow fiber membrane module unit 51, a manifold type is illustrated in FIG. 3, but the filtrate can be taken out from each hollow fiber membrane module 12, 12. If it is a thing, it will not specifically limit.
[0037]
Moreover, the support | pillar 47 is arrange | positioned at each both ends of the said water collection header 45, ie, the four corners of the hollow fiber membrane module unit 52, and is supporting the hollow fiber membrane module unit 52 while fixing the water collection header 45. FIG. By providing the support columns 47, the hollow fiber membrane module unit 52 can maintain sufficient strength.
Further, the shielding plates 48 are provided on both side surfaces of the hollow fiber membrane module unit 52, and when air scrubbing cleaning is performed, air does not spread outside the hollow fiber membrane module unit 52, and the hollow fiber membrane 33 in the air shield plate 48 is efficient. It is well-equipped and provided so that cleaning can proceed smoothly. By using this shielding plate 48, the integration rate of the hollow fiber membranes 33 can be increased, and the hollow fiber membrane module unit 52 can be reduced in size.
[0038]
The method for installing and using the hollow fiber membrane module unit 52 inside the septic tank is the same as the above-described intermediate yarn membrane module unit 51 except that the installation direction is different, and the same effect can be obtained. is there.
[0039]
【Example】
Hereinafter, the present invention will be described in detail with reference to examples.
A hollow fiber membrane module unit 51 shown in FIG. 2 was manufactured, and this hollow fiber membrane module unit 51 was installed in a septic tank made of FRP and subjected to a filtration test.
As the hollow fiber membrane module 11 used for the hollow fiber membrane module unit 51, a polyethylene hollow fiber membrane (fractionation performance: 0.1 μm, outer diameter: 410 μm) manufactured by Mitsubishi Rayon Co., Ltd. is used. The hollow fiber membrane module unit 51 was manufactured by arranging in parallel in the yarn membrane module unit 51 and fixing by the water collecting pipe 41.
[0040]
The hollow fiber membrane module unit 51 was manufactured such that the unit width (A) was 142 mm, the unit length (B) was 400 mm, and the unit height (C) was 916 mm. Further, the membrane area of the hollow fiber membrane 32 is 5 m. ^Three It was.
This hollow fiber membrane module unit 51 was installed below the manhole 2 of the FRP septic tank 1 so that each water collecting pipe 23 of the hollow fiber membrane module unit 51 was perpendicular to the water surface.
[0041]
Next, SS = 10000 mg / L of activated sludge water is filled in the septic tank, the hollow fiber membrane module unit 51 is immersed, LV = 0.02 m / h, air amount 15 m ^Three At / h, the hollow fiber membrane module unit 51 was filtered while performing air scrubbing cleaning.
As a result, although the initial differential pressure at the start of the experiment was 10 KPa, even after 6 months, the differential pressure was 15 KPa, and no significant increase in differential pressure was observed.
Therefore, it was found that the septic tank of the present invention can perform a good filtration process over a long period of time.
[0042]
【The invention's effect】
As described above, in the septic tank of the present invention, the above-described hollow fiber membrane module unit is installed, and the hollow fiber membrane module unit is designed to have such a size that it can be taken in and out of a manhole, and is highly integrated. Since it has a rate, it can be suitably used as a wastewater treatment apparatus as a septic tank having a high filtration capacity. In particular, it is possible to perform maintenance and attachment of the hollow fiber membrane module unit through a manhole in a small septic tank and a processing apparatus made of FRP, and it can be suitably used for filtration treatment of highly polluted water.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a method for installing a hollow fiber membrane module unit of the present invention in a septic tank.
FIG. 2 is a perspective view showing an example of a hollow fiber membrane module unit of the present invention.
FIG. 3 is a perspective view showing an example of a hollow fiber membrane module unit of the present invention.
FIG. 4 is a perspective view showing an example of a hollow fiber membrane module.
FIG. 5 is a perspective view showing an example of arrangement when a plurality of hollow fiber membrane modules are arranged.
[Explanation of symbols]
1 ... septic tank, 2 ... manhole
51, 52 ... Hollow fiber membrane module unit
11, 12 ... Hollow fiber membrane module
23, 25 ... Water collecting pipe
32, 33 ... Hollow fiber membrane
41, 45 ... Catchment header
42, 46 ... suction port
43, 47 ... prop
44, 48 ... Shield plate
(A) Unit width
(B) Unit length
(C) ... Unit height

Claims (4)

A plurality of hollow fiber membrane modules having a hollow fiber membrane constituted by a plurality of hollow fibers and water collecting pipes provided at both ends of the hollow fiber membrane are arranged, and both ends of these water collecting pipes are water collecting headers. A hollow fiber membrane module unit having a rectangular parallelepiped shape integrated with a support column having both ends fixed to the water collecting header and shielding plates provided at both ends of the water collecting header , internal passage shield plate, the hollow fiber membrane der a plate shape provided on both sides of the hollow fiber membrane module unit in parallel to is, the filtrate that has entered the hollow fiber was formed water collecting pipe A septic tank in which a hollow fiber membrane module unit adapted to collect water in a water collection header is installed inside,
The hollow fiber membrane module unit is disposed inside the septic tank so that the water collecting pipe of the hollow fiber membrane module and the membrane surface of the hollow fiber membrane are perpendicular to the water surface,
The size of the arranged hollow fiber membrane module unit is
(A) The length of the unit along the stacking direction of the hollow fiber membrane module is 20 to 500 mm,
(B) The length of the unit along the length direction of the hollow fiber of the hollow fiber membrane module is 100 to 500 mm,
(C) The height of the unit along the length direction of the water collecting pipe of the hollow fiber membrane module is 100-1500 mm,
The septic tank characterized by being. A plurality of hollow fiber membrane modules having a hollow fiber membrane constituted by a plurality of hollow fibers and water collecting pipes provided at both ends of the hollow fiber membrane are arranged, and both ends of these water collecting pipes are water collecting headers. A hollow fiber membrane module unit having a rectangular parallelepiped shape integrated with a support column having both ends fixed to the water collecting header and shielding plates provided at both ends of the water collecting header , internal passage shield plate, the hollow fiber membrane der a plate shape provided on both sides of the hollow fiber membrane module unit in parallel to is, the filtrate that has entered the hollow fiber was formed water collecting pipe A septic tank in which a hollow fiber membrane module unit adapted to collect water in a water collection header is installed inside,
The hollow fiber membrane module unit is disposed inside the septic tank so that the water collecting pipe of the hollow fiber membrane module is in the horizontal direction and the membrane surface of the hollow fiber is in the vertical direction with respect to the water surface,
The size of the arranged hollow fiber membrane module unit is
(A) The length of the unit along the stacking direction of the hollow fiber membrane module is 20 to 500 mm,
(B) The length of the unit along the length direction of the water collecting pipe of the hollow fiber membrane module is 100 to 500 mm,
(C) The length of the unit along the length direction of the hollow fiber of the hollow fiber membrane module is 100 to 1500 mm,
The septic tank characterized by being. The septic tank according to claim 1 or 2, wherein the hollow fiber membrane module unit disposed therein is made of a hollow fiber membrane made of knitted fabric. The septic tank according to any one of claims 1, 2, and 3, wherein a diffuser tube is fixed and integrated with a hollow fiber membrane module unit disposed therein.

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