JP2004305916A - Membrane separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve treatment performance in a membrane separator for performing an advanced sewage treatment with only one treating tank. <P>SOLUTION: This membrane separator 10 is provided with an endless treating tank 14 and a plurality of membrane units 22 disposed in the treating tank 14 at a prescribed interval. A raw water tank 12 is provided on the inner side of the treating tank 14 and water to be treated is supplied from the raw water tank 12 to the downstream side of the respective membrane units 22. The treating tank 14 is provided with a movable wall 44 on a side part of the membrane units 22 and a flow passage can be constricted by the movable wall 44. On the bottom surface of the treating tank 14, the water is deep at the installation positions of the membrane units 22 and an air diffusion pipe 30 is installed at the deep part 34. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a membrane separation device, and more particularly to a membrane separation device for a wastewater treatment facility.
[0002]
[Prior art]
In a conventional membrane separation wastewater treatment apparatus, a mainstream is to perform a membrane treatment by installing a membrane unit in a water tank. For example, when the BOD treatment is targeted, an “oxidation tank” for oxidizing the BOD is provided, and the membrane unit is immersed therein to perform solid-liquid separation. In addition, when performing advanced treatment including nitrogen treatment, two treatment tanks, a "denitrification tank" that performs denitrification while maintaining an anaerobic state and a "nitrification tank" that performs solidification and liquid separation by nitrification and membrane, are used as treatment tanks. The treatment water is circulated between the two tanks.
[0003]
However, when advanced treatment is performed using two tanks, devices for performing liquid feeding, circulation, stirring, and the like are separately required, and there has been a problem that the cost increases.
[0004]
For this reason, in recent years, an apparatus for performing advanced processing using only one tank has been developed. For example, Patent Document 1 proposes a membrane separation device in which a plurality of membrane units are disposed in an endless processing tank. In this membrane separation device, a plurality of membrane units are arranged at predetermined intervals in the flow direction of the water to be treated. Therefore, the filtration process can be performed in multiple stages. Further, since the membrane surface of the membrane unit is arranged in parallel with the flow direction of the swirling flow, accumulation of sludge and the like on the membrane surface can be prevented.
[0005]
Patent Document 2 proposes a membrane separation device in which a diffuser is disposed below a membrane unit and a swirling flow is formed by using an air lift effect of the diffuser. According to this membrane separation device, a swirling flow can be formed by diffusing air by the diffusing means, and power consumption can be reduced.
[0006]
[Patent Document 1]
JP-A-6-285339
[Patent Document 2]
JP 2001-47046 A
[Problems to be solved by the invention]
However, a membrane separation device that performs advanced processing in only one tank has a problem that the processing performance is low.
[0009]
For example, in the membrane separation device of Patent Document 1, BOD in the water to be treated supplied from the raw water supply pipe is consumed as a nutrient source of anaerobic bacteria (for example, denitrifying bacteria) contained in the sludge in the water to be treated. The BOD concentration becomes lower toward the downstream side of the raw water supply pipe. For this reason, there is a problem that the performance of the anaerobic treatment decreases as it goes downstream of the raw water supply pipe.
[0010]
In the membrane separation device of Patent Literature 2, since the swirling flow is formed by the air lift effect, there is a problem that the flow rate of the water to be treated is insufficient, and the effect of cleaning the membrane surface is small. As a result, there has been a problem that the deposition of sludge on the membrane surface cannot be sufficiently prevented, and the membrane surface is blocked in a short period of time, thereby lowering the processing performance.
[0011]
The present invention has been made in view of such circumstances, and an object of the present invention is to improve the processing performance of a membrane separation apparatus that performs advanced processing with only one processing tank.
[0012]
[Means for solving the problem]
In order to achieve the above object, the invention according to claim 1 is an endless treatment tank in which water to be treated is biologically treated and a swirling flow of the water to be treated is formed; In a membrane separation device provided with a plurality of membrane units that are disposed at intervals in the flow direction of the membrane and that perform membrane separation treatment of the water to be treated, supply means for supplying the water to be treated to the treatment tank includes the swirling flow. Is characterized in that the supply is carried out in multiple stages in the flow direction.
[0013]
According to the first aspect of the present invention, the water to be treated is supplied to the treatment tank in multiple stages in the flow direction of the swirl flow, so that the component contained in the water to be treated in the flow direction of the swirl flow ( For example, the occurrence of a concentration distribution of BOD or the like can be prevented. Therefore, it is possible to prevent the conventional disadvantage that the BOD concentration in the water to be treated decreases as it goes downstream, so that the performance of the anaerobic treatment can be improved. The water to be treated is preferably supplied to the downstream side of each membrane unit. When the water to be treated is supplied to this position, the BOD in the water to be treated can be supplied as nutrients to the anaerobic region formed on the downstream side of the membrane unit. Therefore, the performance of anaerobic biological treatment such as denitrification can be improved.
[0014]
According to a second aspect of the present invention, in order to achieve the above object, an endless treatment tank in which a swirling flow of the treatment water is formed, and a membrane separation treatment of the treatment water by being immersed in the treatment water. In a membrane separation device including a membrane unit and a raw water tank for storing the water to be supplied to the processing tank, the raw water tank is provided inside the swirling flow.
[0015]
According to the second aspect of the present invention, since the raw water tank is provided inside the swirling flow, the raw water tank and the treatment tank can be installed in a small space. As a result, the processing efficiency per unit area of the site can be greatly improved.
[0016]
According to the second aspect of the present invention, since the raw water tank is provided inside the swirling flow, the supply of the water to be treated to the treatment tank is facilitated. For example, it is possible to easily supply the water to be treated in multiple stages as described in claim 1.
[0017]
According to a third aspect of the present invention, in order to achieve the above object, an endless treatment tank in which a swirling flow of the treatment water is formed, and a membrane separation treatment of the treatment water by being immersed in the treatment water. In a membrane separation device comprising a membrane unit, wherein the membrane surface of the membrane unit is arranged in parallel with the flow direction of the swirling flow, a narrowing means for narrowing the flow path of the swirling flow is provided at a position where the membrane unit is installed. It is characterized by having.
[0018]
According to the third aspect of the present invention, since the flow path of the swirling flow is narrowed by the narrowing means, the flow velocity of the swirling flow applied to the membrane surface of the membrane unit can be increased. Thereby, the removability of the deposit attached to the film surface can be improved, and the blockage of the film surface can be prevented.
[0019]
According to a fourth aspect of the present invention, in order to achieve the above object, a swirling flow of the tank to be treated is formed, and an endless treatment tank for biologically treating the water to be treated, and immersed in the water to be treated. In a membrane separation device provided with a membrane unit for subjecting the water to be treated to membrane separation, the treatment tank has a deep portion having a large water depth at a position where the membrane unit is installed, and a diffuser is provided at a bottom portion of the deep portion. Is provided.
[0020]
According to the fourth aspect of the present invention, the deep portion of the treatment tank is provided at the installation position of the membrane unit, and the air diffuser is disposed in this deep portion, so that the bubbles diffused by the diffuser contact the water to be treated. The time gets longer. Thereby, the dissolving efficiency of oxygen in the water to be treated can be improved, and the aerobic treatment performance such as nitrification can be improved.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of a membrane separation device according to the present invention will be described in detail with reference to the accompanying drawings.
[0022]
FIG. 1 is a plan view showing a membrane separation device in which the present invention is applied to a nitrification / denitrification device.
[0023]
As shown in FIG. 1, the membrane separation device 10 mainly includes a raw water tank 12 and a processing tank 14. The raw water tank 12 is formed in a substantially rectangular shape, and a processing tank 14 is formed so as to surround the raw water tank 12. That is, the treatment tank 14 is formed in an endless shape, and the raw water tank 12 is provided inside the treatment tank 14. Water to be treated is stored in the raw water tank 12, and the water to be treated is supplied to the treatment tank 14 via a supply pipe 16 described later.
[0024]
The processing tank 14 is provided with a stirrer 18. By driving the stirrer 18, a swirling flow in which the water to be treated swirls around the raw water tank 12 is formed. The stirrer 18 may be driven only at the start of operation. That is, the stirrer 18 may be stopped when the swirling flow is formed stably by the air lift effect described later.
[0025]
The processing tank 14 is provided with a plurality of film units 22. The membrane units 22 are arranged at predetermined intervals in the flow direction of the swirling flow.
[0026]
As shown in FIG. 2, the membrane unit 22 includes a plurality of membrane elements 24, 24,. Each membrane element 24 is formed by bonding a membrane 26 such as an organic flat membrane to both surfaces of a water-permeable material (not shown) formed in a rectangular plate shape, and sealing the outer periphery thereof with a sealing member (not shown). It consists of. Each membrane unit 22 is arranged in parallel at a predetermined interval, and is installed such that the membrane 26 of each membrane unit 22 is parallel to the inner wall of the processing tank 14 (see FIG. 1).
[0027]
A water collecting pipe 28 is connected to an upper end of the membrane element 24. The water collection pipe 28 is communicated with the inside of the membrane element 24, and the tip is connected to a pump (see FIG. 1) 20. Therefore, by driving the pump 20, a suction action works inside each membrane element 24, and the water to be treated is sucked inside through the membrane 26. Then, the treated water that has passed through the membrane 26 is drained through the water collecting pipe 28. Although FIG. 1 illustrates an example in which a separate pump 20 is connected to each membrane unit 22, a common pump may be used for a plurality of membrane units 22. FIG. 2 shows an example in which the water collecting pipe 28 is connected to the upper part of the membrane element 24. However, the water collecting pipe may be connected to both left and right ends of the membrane element 24 so that the treated water is drawn out in the horizontal direction. Good.
[0028]
As shown in FIG. 3, a deep portion 34 having a large water depth is formed on the bottom surface of the processing tank 14 at the installation position of each membrane unit 22. The water depth in the deep part 34 is configured to be approximately twice as large as the water depth in other parts. The above-described membrane element 24 is formed vertically long so as to correspond to the deep portion 34. Instead of providing the vertically long membrane element 24, a normal (small height dimension) membrane element may be vertically arranged in a plurality of layers.
[0029]
A diffuser 30 is provided below the membrane unit 22, and the diffuser 30 is connected to a blower 32. When air is supplied from the blower 32, countless bubbles are diffused into the water to be treated. Since the diffused bubbles rise between the membrane elements 24, 24, an upward flow of the water to be treated is formed by the air lift effect. Thereby, a cross flow is applied to the film 26, and the film 26 is cleaned. Therefore, it is possible to suppress the deposit from being deposited on the film 26.
[0030]
The baffle plates 36 and 38 are erected on the upstream side and the downstream side of the membrane unit 20, respectively. The baffle plates 36 and 38 are installed so as to be orthogonal to the side walls 14A and 14B (see FIG. 5) of the processing tank 14. The upstream baffle plate 36 has an upper end protruding higher than the liquid level and a lower end disposed with a predetermined gap from the bottom surface. On the other hand, the baffle plate 38 on the downstream side has an upper end located at a position slightly lower than the liquid level and a lower end fixed to the bottom surface. Therefore, when air is diffused from the air diffuser 30, an upward flow of the water to be treated is formed by the air lift effect of the diffused air bubbles. Then, the water to be treated on the upstream side is sucked into the membrane unit 22 side so as to go under the lower end of the upstream baffle plate 36, and the water to be treated on the membrane unit 22 side is drawn into the upper end of the downstream baffle plate 38. And flows downstream. Thus, a swirling flow in which the water to be treated swirls around the raw water tank 12 is formed. The upstream side of the deep portion 34 is formed in a tapered shape so that the water to be treated can smoothly penetrate between the two baffle plates 36 and 38.
[0031]
As shown in FIG. 1, the supply pipe 16 is connected to the processing tank 14 on the downstream side of each membrane unit 22 (that is, on the downstream side of each baffle plate 38). The supply pipe 16 is provided with a pump 40 and a valve 42. By driving the pump 40, the water to be treated in the raw water tank 12 is supplied to the treatment tank 14. The flow rate of the water to be treated flowing through the supply pipe 16 is adjusted by adjusting the opening degree of the valve 42 or the amount of liquid sent from the pump 40. Thereby, the flow rate of the water to be treated supplied by each supply pipe 16 can be adjusted.
[0032]
The tip of the supply pipe 16 is preferably disposed in the liquid to be treated. As a result, the water to be treated is supplied to the lower portion on the downstream side of the baffle plate 38, so that the formation of a stagnation area of the water to be treated in this area can be prevented.
[0033]
The method for supplying the water to be treated is not limited to the above. For example, as shown in FIG. 4, the supply pipe 48 may be connected to the upper part of the side wall of the raw water tank 12, and a weir 50 may be provided at the inlet of the supply pipe 48 so as to be slidable up and down. In this case, when the water level of the raw water tank 12 rises and exceeds the upper end of the weir 50, the water to be treated is automatically supplied from the supply pipe 48 to the treatment tank 14. Further, the supply flow rate of the water to be treated can be adjusted by manually or automatically changing the height position of the weir 50. Note that the supply pipe 48 may not be provided, and an opening may be provided only on the upper part of the side wall of the raw water tank 12.
[0034]
As shown in FIG. 5, movable walls 44 are provided on the side walls 14A and 14B of the processing tank 14. The movable wall 44 is provided on the side of the membrane unit 22 and is slidably supported in the width direction of the processing tank 14. The movable wall 44 is connected to a cylinder 46, and is moved in the width direction of the processing bath 14 by the cylinder 46. Therefore, the flow path of the swirling flow can be narrowed by the movable wall 44, and the flow velocity of the water to be treated passing through the membrane unit 22 can be increased. Thereby, the shearing force applied to the film 26 of the film unit 22 is increased, so that the separability of the deposit attached to the film 26 is improved, and the blockage of the film 26 can be prevented. It is preferable that the movable walls 44, 44 slide on the side walls 14A, 14B by the same amount at the same time. The movable wall 44 is preferably provided on both the side walls 14A and 14B, but may be provided on only one of the side walls.
[0035]
Next, the operation of the membrane separation device 10 configured as described above will be described.
[0036]
When the blower 32 is driven to diffuse air from the air diffuser 30, the water to be treated rises due to an air lift effect. Then, the water to be treated is sucked into the membrane unit 22 side from below the upstream baffle plate 36, and the water to be treated on the membrane unit 22 side flows out over the upper end of the baffle plate 38. Thus, a swirling flow in which the water to be treated swirls around the raw water tank 12 is formed. At this time, by driving the stirrer 18, the swirling flow can be quickly formed.
[0037]
By performing the air diffusion from the air diffuser 30, the installation position of the membrane unit 22 (that is, between the baffle plates 36 and 38) is in an aerobic state. Hereinafter, this area is referred to as an aerobic part. In addition, between the aerobic part and the aerobic part, there is no contact with oxygen, so that an anaerobic state (hereinafter, referred to as an anaerobic part).
[0038]
The to-be-treated water alternately passes through the aerobic part and the anaerobic part by swirling in the treatment tank 14. Thereby, the nitrification action in the aerobic part and the denitrification action in the anaerobic part are alternately received, and the nitrogen component of the water to be treated is efficiently removed.
[0039]
When the pump 20 is driven in a state where the swirling flow of the water to be treated is formed, the water to be treated is sucked into the membrane element 24. Thereby, membrane filtration is performed and treated water without any suspended matter can be obtained. As a result of the membrane filtration, the sludge concentration inside the treatment tank 14 increases, for example, to a high sludge concentration of 10 g / L. As a result, the consumption of DO in the aerobic section increases, so that the DO in the anaerobic section decreases, and the processing performance in the anaerobic section can be improved.
[0040]
By the way, in the anaerobic part, anaerobic treatment is performed using BOD in the water to be treated as a nutrient source. Therefore, when the BOD concentration decreases in the anaerobic section, there arises a problem that the processing performance in the anaerobic section decreases. In the conventional apparatus, since the water to be treated (raw water) is supplied to the treatment tank at one location, there has been a problem that the processing performance decreases as the anaerobic part is located downstream of the supply position.
[0041]
In the present embodiment, in order to solve such a problem, the supply pipes 16, 16 are connected to the downstream side of the membrane units 22, 22, so that the water to be treated is supplied to each anaerobic section. I have. Thereby, the BOD is sufficiently supplied to each anaerobic section, so that the processing performance in the anaerobic section can be improved.
[0042]
Further, according to the present embodiment, since the film 26 is arranged in parallel to the flow direction of the swirling flow, the film 26 can be washed by the swirling flow, and the deposition of the deposit on the film 26 can be prevented. .
[0043]
Furthermore, in the present embodiment, since the movable wall 44 can be made to protrude from the side wall of the processing bath 14 to narrow the flow path of the swirling flow, the flow speed of the swirling flow applied to the film 26 is increased, and the cleaning of the film 26 is performed. The effect can be increased. In the present embodiment, the movable wall 44 can be retracted if necessary, and the swirl flow path can be expanded. Therefore, for example, the swirling flow can be easily formed by widening the flow path at the start of operation. Further, the flow path of the swirling flow may be narrowed only when the membrane 26 is washed. By operating the stirrer 18, it is also possible to increase the flow velocity of the swirling flow and enhance the cleaning effect of the membrane 26.
[0044]
Further, according to the present embodiment, since the deep portion 34 is provided in the treatment tank 14 and the diffuser 30 is disposed at the bottom of the deep portion 34, the air bubbles diffused from the diffuser 30 are supplied to the water to be treated. The contact time is longer. Therefore, the dissolved oxygen concentration in the aerobic part can be improved. Thereby, even when the sludge concentration is high, DO can be reliably increased in the aerobic section, and the processing performance in the aerobic section can be maintained.
[0045]
Further, in the present embodiment, since the raw water tank 12 is provided inside the endless processing tank 14, the processing tank 14 and the raw water tank 12 can be installed in a small space. Therefore, the processing performance per unit area of the site can be improved.
[0046]
Further, by providing the raw water tank 12 inside the treatment tank 14, the supply of the water to be treated to the treatment tank 14 can be easily controlled. For example, when the supply amount is adjusted using the weir 50 as shown in FIG. 4, the same amount of water to be treated can be supplied in each supply pipe 48 only by adjusting the height position of the weir 50. it can.
[0047]
The membrane separation device 10 described above has four main components (i.e., (1) supplying the water to be treated in multiple stages, (2) providing the raw water tank 12 inside the treatment tank 14). (3) that the flow path is narrowed at the installation position of the membrane unit 22, and (4) that the deep portion 34 of the processing tank 14 is provided at the installation position of the membrane unit 22). If any one of the constituent requirements is satisfied, the processing performance can be improved. Hereinafter, each component requirement will be described.
[0048]
The membrane separation apparatus shown in FIG. 6 is an example of an apparatus that satisfies the above-described configuration requirement (1). In the membrane separation device shown in the figure, a raw water tank 52 is arranged outside a processing tank 54, and the raw water tank 52 and the processing tank 54 are connected via a supply pipe 56. The supply pipe 56 is branched at the end on the processing tank 54 side, and each is connected to the processing tank 54 downstream of the membrane unit 22. A valve 58 capable of adjusting the flow rate is provided in each of the branch pipe portions of the supply pipe 56. Therefore, by driving the pump 60 disposed in the supply pipe 56, the water to be treated in the raw water tank 52 is supplied into the treatment tank 54 via the supply pipe 56. At that time, by adjusting the opening degree of the valve 58, each supply amount can be adjusted. Thereby, the water to be treated in the raw water tank 52 can be supplied in multiple stages in the flow direction of the swirling flow.
[0049]
In the membrane separation apparatus configured as described above, the treated water can be supplied in multiple stages in the flow direction of the swirling flow, so that the component distribution of the water to be treated (particularly, the BOD concentration distribution) in the flow direction of the swirling flow. Can be prevented from occurring.
[0050]
The supply position of the water to be treated is not limited to the upstream side of the anaerobic section, but may be any as long as it is supplied in multiple stages along the swirling flow. Therefore, for example, the water to be treated may be supplied to the upstream side of each aerobic section (that is, the upstream side of the baffle plate 36) to increase the DO.
[0051]
The membrane separation apparatus shown in FIG. 7 is an example of an apparatus that satisfies the configuration requirement (2). As shown in the figure, the treatment tank 64 is formed in a substantially oval frame shape, and the raw water tank 62 is formed in a substantially oval shape inside thereof. The water to be treated in the raw water tank 62 is supplied to the treatment tank 64 by a supply pipe 66. A membrane unit 22 is provided in the processing tank 64, and membrane filtration is performed by the membrane unit 22.
[0052]
According to this membrane separation device, since the raw water tank 62 is disposed inside the processing tank 64, the processing tank 64 and the raw water tank 62 can be installed in a small space, and the processing performance per unit area of the site is improved. Can be improved. Note that the raw water tank 62 may be provided inside the processing tank 64, and the shape thereof is not limited to the same shape as the inner wall of the processing tank 64. Therefore, as shown by a two-dot chain line in FIG. 7, the inside of the treatment tank 64 may be divided into two, one of which may be used as the raw water tank 62 and the other may be used as a tank for storing treated water or sludge.
[0053]
In addition, the shape of the processing tanks 14 and 64 is not limited to the above-described rectangular frame shape or elliptical frame shape, but is an endless shape capable of forming a swirling flow, such as a circumferential shape or a polygonal frame shape. Should be fine. However, since it is preferable that the membrane unit 22 is arranged in a straight line portion of the flow path of the swirling flow, in order to install the plurality of membrane units 22, 22,... In a small site area, as shown in FIG. It is preferable to use a processing tank 64 having a frame shape. Also, the raw water tanks 12 and 62 may have any shape as long as they can be arranged inside the processing tanks 14 and 64.
[0054]
FIGS. 8 and 9 are views showing another embodiment of the narrowing means for narrowing the flow path of the swirling flow.
[0055]
The stenosis means shown in FIG. The oscillating plate 68 is provided on the side of the membrane unit 22 and is attached to a concave portion formed on the side walls 14A and 14B of the processing bath 14. The swing plate 68 is supported so as to be able to swing around a shaft 70. The shaft 70 is installed so as to be orthogonal to the flow direction of the swirling flow passing through the membrane unit 22. For example, when an upward flow is formed at the position of the membrane unit 22 as described above, the shaft 70 is installed horizontally. In the case where the baffles 36 and 38 shown in FIG. 3 are not provided and a horizontal swirling flow is always formed, the shaft 70 is installed vertically. The swing plate 68 is swingably supported about the shaft 70 arranged as described above, and is swinged by a driving unit (not shown). By swinging the swing plate 68 and projecting from the wall surfaces 14A and 14B, the flow path of the swirling flow can be narrowed. Further, by adjusting the angle of the swing plate 68, the cross-sectional area of the flow path can be adjusted. Further, it is also possible to accommodate the rocking plate 68 in the concave portion to widen the flow path.
[0056]
The stenosis means shown in FIG. The airbag 72 is attached to the side walls 14 </ b> A and 14 </ b> B of the processing tank 14 and inflates by sending air into the airbag 72. Thereby, the flow path of the swirling flow can be narrowed. The airbag 72 contracts by discharging air from the inside. Thereby, the flow path of the swirling flow can be narrowed. As a means for inflating the airbag 72, a blower 32 for diffusing air (see FIG. 3) may be used.
[0057]
In the above-described embodiment, the flow path is narrowed in the width direction of the processing bath 14. However, the narrowing direction is not limited to this, and the flow path is narrowed in the longitudinal direction or the height direction of the processing bath 14. You may. For example, the flow path may be narrowed by reducing the distance between the baffle plates 36 and 38 shown in FIG.
[0058]
In the above-described embodiment, an example of the movable stenosis unit has been described. However, a fixed stenosis unit may be used. For example, convex portions may be provided on the side walls 14A and 14B of the processing bath 14 to narrow the flow path.
[0059]
【The invention's effect】
As described above, according to the membrane separation device of the present invention, the water to be treated is supplied in multiple stages in the flow direction of the swirl flow, the raw water tank is provided inside the swirl flow, and the flow path of the swirl flow By narrowing the membrane at the position of the membrane unit, or by providing a deep portion of the processing tank at the position of the membrane unit, the processing performance of the membrane separation apparatus that performs advanced processing in one processing tank can be improved. .
[Brief description of the drawings]
1 is a configuration diagram schematically showing the configuration of a membrane separation device according to the present invention; FIG. 2 is a perspective view showing the configuration of a membrane unit; FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. FIG. 5 is a cross-sectional view showing another method of supplying the water to be treated. FIG. 5 is a plan view showing a constriction means. FIG. 6 is a configuration diagram showing another membrane separation apparatus for supplying the water to be treated in multiple stages. FIG. 8 is a configuration diagram showing another membrane separation device in which a raw water tank is arranged inside a swirling flow. FIG. 8 is a longitudinal sectional view showing another embodiment of the constriction means. FIG. 9 is a longitudinal section showing another embodiment of the constriction means. Figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Membrane separation apparatus, 12 ... Raw water tank, 14 ... Treatment tank, 16 ... Supply piping, 18 ... Stirrer, 22 ... Membrane unit, 24 ... Membrane element, 26 ... Membrane, 28 ... Water collecting pipe, 30 ... Aeration pipe, 32 blower, 34 deep, 36 baffle plate, 38 baffle plate, 40 pump, 42 valve, 44 movable wall, 46 cylinder, 48 supply pipe, 50 weir, 52 base Water tank, 54 ... processing tank, 56 ... supply pipe, 58 ... valve, 60 ... pump, 62 ... raw water tank, 64 ... processing tank, 66 ... supply pipe, 68 ... rocking plate, 70 ... shaft, 72 ... air bag

Claims (4)

The water to be treated is biologically treated, and an endless treatment tank in which the swirling flow of the to-be-processed water is formed, and is disposed at intervals in the flow direction of the swirling flow. In a membrane separation device having a plurality of membrane units for performing membrane separation processing,
A membrane separation apparatus, wherein supply means for supplying the water to be treated to the treatment tank performs supply in multiple stages in the flow direction of the swirling flow. An endless treatment tank in which a swirling flow of the treatment water is formed, a membrane unit immersed in the treatment water to perform a membrane separation treatment of the treatment water, and the treatment water supplied to the treatment tank is stored. In a membrane separation device provided with a raw water tank,
The membrane separation device, wherein the raw water tank is provided inside the swirling flow. An endless treatment tank in which a swirling flow of the to-be-treated water is formed, and a membrane unit that is immersed in the to-be-treated water to perform a membrane separation treatment of the to-be-treated water, and the membrane surface of the membrane unit is a part of the swirling flow. In a membrane separation device arranged parallel to the flow direction,
A membrane separation device, wherein a narrowing means for narrowing the flow path of the swirling flow is provided at an installation position of the membrane unit. An endless treatment tank in which the water to be treated is biologically treated and the swirling flow of the water to be treated is formed, and a membrane unit that is immersed in the water to be treated and undergoes membrane separation treatment of the water to be treated In a membrane separation device provided with
The membrane separation device, wherein the treatment tank has a deep portion having a large water depth at a position where the membrane unit is installed, and an aeration unit is provided at a bottom of the deep portion.

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