JP4929220B2 - Immersion membrane separator - Google Patents

Description

  The present invention relates to a submerged membrane separation apparatus that is immersed in a treatment tank that stores the water to be treated and that filters the water to be treated.

  Conventionally, in order to filter the water to be treated including activated sludge and agglomerated sludge, a method of immersing an immersion type membrane separation apparatus in a treatment tank for storing the water to be treated has been used. In this method, the equipment is compact, the treated water obtained is clear, the concentration tank is unnecessary, the activated sludge is kept in the treatment tank at a high concentration, and a high treatment efficiency is obtained. It is an excellent technology with merit.

  A typical conventional submerged membrane separator is shown in FIG. A conventional submerged membrane separation apparatus 100 includes a separation membrane unit 103 in which a plurality of separation membrane modules 101 are supported in a casing 102 that is open at the top and bottom, and an air diffuser 104 provided below the separation membrane module 101. And is immersed in the treatment tank 200.

  A filtered water suction pipe (not shown) is connected to the separation membrane module 101. The filtered water that has permeated through the separation membrane flows through the filtered water suction pipe and is collected by the negative pressure by the suction pump with respect to the filtered water suction pipe or the natural water head by the siphon.

  The air diffuser 104 supplies aeration air to the water to be treated in the treatment tank 200. This aerated air causes an air lift upward flow in the water to be treated, and a shearing force is applied to the separation membrane surface of the separation membrane module 101. By this shearing force, accumulation of sludge on the separation membrane surface of the separation membrane module 101 is suppressed, and clogging of the separation membrane is suppressed (air scrubbing cleaning).

  In addition, the flow path of the air lift upward flow is restricted by the casing 102, whereby a shearing force can be efficiently applied to the separation membrane surface of the separation membrane module 101. As an immersion type membrane separation apparatus provided with such a casing, for example, Patent Document 1 discloses an immersion type membrane separation apparatus in which a flat membrane module is supported in a casing having an open top and bottom. Patent Document 2 discloses a submerged membrane separation apparatus in which a hollow fiber membrane module is supported in a casing that is open at the top and bottom.

By the way, sludge that cannot be removed by the air lift upward flow is gradually deposited on the surface of the separation membrane of the separation membrane module 101 as the operation time elapses. Therefore, normally, a chemical solution containing an oxidizing agent and an acid is injected into the separation membrane module 101 through the filtered water suction pipe, and the separation membrane surface of the separation membrane module 101 is washed (in-line washing).
Further, when the deposition of sludge on the surface of the separation membrane is significant, as shown in FIG. 8, the separation membrane unit 103 is pulled up from the treatment tank 200 and immersed in a chemical tank (not shown) (immersion cleaning). Further, when the sludge is firmly fixed on the surface of the separation membrane, physical cleaning (jet cleaning or the like) is performed. In the air diffuser 104, as in the case of the separation membrane module 101, sludge is accumulated and clogging occurs, so jet cleaning or immersion cleaning may be performed.

Further, since the separation membrane of the separation membrane module 101 deteriorates in about 5 to 10 years, it is necessary to replace the separation membrane module 101 by lifting the separation membrane unit 103 out of the processing tank 200 each time.
Thus, for the maintenance, it is necessary to frequently lift the separation membrane unit 103 out of the processing tank 200.
JP 7-275669 A JP-A-9-276669

However, since the conventional submerged membrane separation apparatus is a separation membrane unit in which the membrane module is supported by the casing, the mass of the membrane unit becomes a heavy product obtained by adding the mass of the casing to the mass of the membrane module, and the separation from the treatment tank is performed. There has been a problem that enormous labor is required for pulling up the membrane unit and installing the separation membrane unit in the treatment tank. Moreover, since the separation membrane unit of the submerged membrane separation apparatus disclosed in Patent Documents 1 and 2 has a configuration in which the separation membrane module is supported by a casing that is open only at the top and bottom, physical cleaning and replacement of the separation membrane module Has to be carried out from the upper and lower openings of the separation membrane unit or after the casing has been disassembled, resulting in a problem that the maintenance becomes complicated.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a submerged membrane separation apparatus that can be easily pulled up from the processing tank and installed in the processing tank and has good maintainability.

In order to achieve the above object, the present invention adopts the following configuration.
(1) A separation membrane unit comprising a separation membrane module that is immersed in a treatment tank for storing the treated water and that filters the treated water, and a support that supports the separation membrane module;
Aeration means disposed below the separation membrane module;
On the side of the separation membrane unit, a rectifying plate is disposed with a predetermined interval between the upper end and the water surface, and between the lower end and the bottom surface of the treatment tank, and obtains an airlift upward flow in the separation membrane unit When,
Guide means for guiding the separation membrane unit to a predetermined position in the processing tank;
Have
The guide means is installed in the treatment tank, and an upper end extends to the surface of the water, and the separation membrane unit can be pulled up independently with respect to the rectifying plate. Immersion membrane separator.
(2) The submerged membrane separation device according to (1), wherein the separation membrane module is a hollow fiber membrane module.
(3) The submerged membrane separation apparatus according to (1) or (2), wherein the aeration means is supported by the separation membrane unit.
(4) The submerged membrane separation apparatus according to ( 1 ), wherein the rectifying plate is supported by the guide means.
( 5 ) The submerged membrane separation apparatus according to any one of (1) to ( 4 ), wherein a plurality of the separation membrane units are immersed and installed using a current plate.

  The submerged membrane separation apparatus of the present invention can be easily pulled up from the processing tank and installed in the processing tank, and has good maintainability.

Hereinafter, the immersion membrane separation apparatus of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a submerged membrane separation apparatus 10 according to an embodiment of the present invention is immersed in a reaction tank 30 that stores water to be treated, and a plurality of separation membrane modules that filter the water to be treated. 11 and a separation membrane unit 13 provided with a support 12 that supports the separation membrane module 11, and a rectifying plate 18 disposed on the side of the separation membrane unit 13 without contacting the bottom surface 30 a of the treatment tank 30. have. Connected to the separation membrane module 11 are a filtered water suction pipe 14 through which filtered water flows and an aerated air supply pipe 16 for supplying aerated air into the reaction tank 30. The filtered water suction pipe 14 is provided with a suction pump 20 that applies a suction pressure to the separation membrane module 11 and a suction pressure gauge 21 that detects the suction pressure. The aeration air supply pipe 16 is provided with a blower 22 for supplying aeration air and a flow rate adjusting means 23 for adjusting the flow rate of the aeration air from the blower 22. The reaction tank 30 is provided with a guide rail 17 for guiding the separation membrane unit 13 to a predetermined position, and the rectifying plate 18 is fixed to the guide rail 17.
In this embodiment, the submerged membrane separation apparatus 10 having one membrane unit 13 in the reaction tank 30 is shown. Further, in FIG. 1, illustration of the rectifying plates in front of and behind the separation membrane unit 13 is omitted.

  The reaction tank 30 is an example of a treatment tank in which the submerged membrane separation apparatus 10 is immersed, and is a tank that performs microbial treatment of water to be treated with activated sludge. The reaction tank 30 is made of concrete, steel, or the like, and is provided indoors or outdoors. The treated water stored in the reaction tank 30 holds activated sludge having a sludge concentration of about 5000 to 20000 mg / L.

  The separation membrane unit 13 is a unit in which a plurality of separation membrane modules 11 are supported by the support 12 with a predetermined interval, and can be pulled up from the reaction vessel 30 independently with respect to the current plate 18. . The separation membrane module 11 is supported by the support 12 with the upper, lower, and side portions of the separation membrane module 11 being substantially exposed.

  The separation membrane module 11 includes a hollow fiber membrane 11a, an upper fixing member 11b provided at one end (upper end portion) of the hollow fiber membrane 11a, and a lower fixing provided at the other end (lower end portion) of the hollow fiber membrane 11a. This is a hollow fiber membrane module schematically configured with the member 11c.

  The hollow fiber membrane 11a is obtained by bundling a plurality of hollow fibers at both ends in the length direction, and an upper end portion of the hollow fiber membrane 11a is in a state in which a hollow hole of the hollow fiber is opened, and a lower end portion of the hollow fiber membrane 11a is bonded. The hollow holes are blocked by immersion of the agent.

The number of hollow fibers bundled in the hollow fiber membrane 11a is appropriately determined depending on the type of hollow fibers used, the desired filtration capacity, and the like. Further, the length of the hollow fiber bundled in the hollow fiber membrane 11a is appropriately determined in consideration of the depth of the reaction tank 30, the desired filtration ability, handling property, and the like.
Examples of the material of the hollow fiber membrane 11a include a polyvinylidene fluoride (PVDF) hollow fiber membrane, a polyacrylonitrile (PAN) hollow fiber membrane, a polysulfone (PS) hollow fiber membrane, and a polyethylene (PE) hollow fiber membrane. Among these, polyvinylidene fluoride having excellent durability against acids and alkalis is preferable.

  In the upper fixing member 11b, there is provided a filtrate recovery unit (not shown) that communicates with the hollow holes of the hollow fiber membrane 11a and into which filtrates flowing through the hollow holes merge. The upper fixing member 11b is connected to a filtered water suction pipe 14 that communicates with the filtered water recovery unit and guides the filtered water out of the separation membrane module 11.

Below the separation membrane module 11, an aeration means 15 for supplying aerated air into the water to be treated is disposed. An aeration air supply pipe 16 is connected to the air diffuser 15. In this embodiment, the air diffuser 15 is supported by the separation membrane unit 13.
The air diffuser 15 is not particularly limited, and examples thereof include a hollow pipe in which a plurality of discharge holes are formed on the peripheral surface.

  As filtered water suction piping 14, metal piping, synthetic resin piping, and what combined those piping suitably are mentioned. The filtered water suction pipe 14 has a desired location in the filtered water suction pipe 14 so as not to hinder the lifting of the separation membrane unit 13 when performing maintenance by lifting the separation membrane unit 13 to be described later out of the reaction tank 30. The separation membrane unit 13 to be pulled up may be followed by using a flexible pipe for the filtered water suction pipe 14.

  As aeration air supply piping 16, metal piping, synthetic resin piping, and what combined those piping suitably are mentioned. The aeration air supply pipe 16 is provided at a desired location of the aeration air supply pipe 16 so that the separation membrane unit 13 will not be hindered when the separation membrane unit 13 described later is pulled out of the reaction tank 30 for maintenance. The separation membrane unit 13 to be pulled up may be able to follow by using a flexible pipe for the aeration air supply pipe 16.

The support 12 is schematically configured by combining rod-shaped members. The support 12 includes a holder 12 a that supports the separation membrane module 11 and an engaging portion 12 b that engages with the guide rail 17. In this embodiment, the engaging portion 12b is formed with an engaging hole 12c through which the guide rail 17 is passed. The shape of the engagement hole 12c is not particularly limited, and is appropriately determined according to the thickness and shape of the guide rail 17.
The plurality of separation membrane modules 11 are attached to a holder 12a installed at a desired interval, and are detachably supported on the support 12 with the upper, lower and side surfaces of the separation membrane module 11 exposed. ing.
Although there is no restriction | limiting in particular as the material of the member which comprises the support body 12, Since the support body 12 is immersed in the chemical | medical solution containing an oxidizing agent by immersion washing mentioned later, for example, stainless steel (SUS), ABS resin, etc. A highly corrosive material is preferred.
The holder 12a may be provided with a drop-off prevention mechanism that prevents the separation membrane module 11 from dropping off.

The guide rail 17 is installed in the reaction tank 30 as guide means for guiding the separation membrane unit 13 to a predetermined position. The guide rail 17 is passed through the engagement hole 12c provided in the engagement portion 12b of the support 12 in a state where the separation membrane unit 13 is immersed in the water to be treated.
Examples of the guide rail 17 include a pipe, an angle, and H steel. In addition, it is preferable that the upper end 17a of the guide rail 17 is located above the water surface A of the water to be treated so that the position can be easily recognized.

The current plate 18 is connected to the guide rail 17 by welding, bolts, or the like, and is disposed on the side of the separation membrane unit 13 without contacting the bottom surface 30 a of the reaction tank 30. More specifically, the arrangement of the rectifying plate 18 is between the upper end 18a of the rectifying plate 18 and the water surface A of the water to be treated and the rectifying plate 18 so as not to hinder the flow of the air lift upward flow caused by aeration during operation. Between the lower end 18b of the reaction tank 30 and the bottom surface 30a of the reaction tank 30, it is arranged in the reaction tank 30 with a desired interval. The rectifying plate 18 is for restricting the flow path of the air lift upward flow generated in the water to be treated by the aerated air discharged from the aeration means, like the casing in the conventional submerged membrane separation apparatus. is there.
The material of the members constituting the current plate 18 is not particularly limited, and examples thereof include metals such as stainless steel and synthetic resins. However, since the current plate 18 does not come into direct contact with the oxidizing agent, a resin paint is applied to a steel material such as iron. It may be coated with.

Next, the operation and maintenance of the submerged membrane separation apparatus 10 will be described with reference to FIGS.
As shown in FIG. 1, the operation of the submerged membrane separation apparatus 10 is performed with the suction pump 20 in a state where the guide rail 17 and the engaging portion 12 b are engaged and immersed in the water to be treated in the reaction tank 30. The suction pressure (negative pressure) is applied to the separation membrane module 11 through the filtered water suction pipe 14. Thereby, the filtered water which permeate | transmitted the hollow fiber membrane 11a raises the inside of a hollow hole with a negative pressure, and reaches the filtered water collection | recovery part (not shown) in the upper fixing member 11b. Next, the filtered water flows through the filtered water suction pipe 14 by the suction pressure by the suction pump 20 and is led out of the separation membrane module 11. Thus, the filtered water derived from the separation membrane module 11 has a very good water quality and can be reused.

  During operation of the submerged membrane separation apparatus 10, aspiration air is supplied to the water to be treated along with the application of the suction pressure to the separation membrane module 11 described above. The aerated air is sent from the blower 22, the flow rate is adjusted by the flow rate adjusting means 23, and then flows through the aerated air supply pipe 16. And aeration air is discharged | emitted from the aeration means 15 as a fine bubble in to-be-processed water.

The aerated air released into the water to be treated rises toward the water surface A. By this aerated air, an air lift upward flow is generated in the water to be treated. When the water to be treated that rises by the air lift upward flow passes around the hollow fiber membrane 11a, a shearing force is applied to the hollow fiber membrane 11a.
Thus, by supplying aeration air into the water to be treated, oxygen necessary for microbial treatment is supplied, and air scrubbing cleaning is performed on the hollow fiber membrane 11a. By this air scrubbing cleaning, accumulation of sludge on the membrane surface of the hollow fiber membrane 11a is suppressed.

  The treated water that has risen to the vicinity of the water surface A by the air lift ascending flow passes between the upper end 18a of the rectifying plate 18 and the water surface A of the treated water, and then becomes a descending flow to the bottom surface 30a of the reaction tank 30. It flows toward. And the to-be-processed water which fell to the bottom face 30a vicinity passes between between the lower end 18b and the bottom face 30a of the baffle plate 18, and rises again by an air lift upward flow. As described above, the water to be treated in the reaction tank 30 is agitated, so that the microbial treatment is promoted and the air scrubbing cleaning is efficiently performed.

  Here, it is preferable that the area of the portion surrounded by the rectifying plate 18 when the reaction tank 30 is viewed from above is 1/2 or less with respect to the bottom area of the reaction tank 30. When the area of the portion surrounded by the rectifying plate 18 exceeds 1/2 with respect to the bottom area of the reaction tank 30, the flow rates of the air lift upflow and the downflow generated in the reaction tank 30 by the aerated air are slowed down. There exists a tendency and there exists a possibility that the washing | cleaning effect with respect to a separation membrane and the stirring effect of to-be-processed water may fall.

  By the air scrubbing cleaning, the accumulation of sludge on the membrane surface of the hollow fiber membrane 11a is suppressed. However, when the operation of the reaction tank 30 is continued for a long period of time, sludge is gradually deposited on the membrane surface of the hollow fiber membrane 11a, and the hollow fiber membrane 11a is likely to be clogged. Therefore, in addition to air scrubbing cleaning, in-line cleaning in which a chemical solution is injected into the separation membrane module 11, immersion cleaning in which the separation membrane unit 13 is immersed in the chemical solution, and jet cleaning with respect to the separation membrane module 11 are performed.

  In-line washing temporarily stops the collection of filtered water, and injects a chemical solution containing an oxidant and an acid into the separation membrane module 11 through the filtered water suction pipe 14 in the direction opposite to the flow direction of the filtered water. This is a method of cleaning the membrane surface of 11a, and is performed when sludge is lightly deposited on the hollow fiber membrane 11a. As the chemical solution, sodium hypochlorite solution is mainly used when the deposit on the film surface is organic, and oxalic acid and citric acid are used when the deposit on the film surface is inorganic. Acid solutions such as acid and hydrochloric acid are used.

  Immersion cleaning is a method in which the separation membrane unit 13 is pulled up from the reaction tank 30 and then immersed in a chemical solution tank (not shown) filled with a chemical solution containing an oxidizing agent or an acid. The hollow fiber membrane 11a This is done when there is a lot of sludge on the ground. The chemical solution used in the chemical bath is mainly an oxidant solution such as sodium hypochlorite solution when the deposit on the film surface is organic, and the deposit on the film surface is In the case of using an inorganic substance, an acid solution such as oxalic acid, citric acid or hydrochloric acid is used.

The jet cleaning is a physical cleaning method in which the separation membrane unit 13 is lifted from the reaction tank 30 and water is sprayed onto the hollow fiber membrane 11a to remove sludge. The sludge is firmly formed on the membrane surface of the hollow fiber membrane 11a. Performed when stuck.
Note that these cleanings may be performed periodically, or may be appropriately performed by visually observing the state of sludge accumulation or by using the suction pressure detected by the suction pressure gauge 21 as a guide.

By the way, when the hollow fiber membrane 11a deteriorates, the separation membrane unit 13 is pulled up from the reaction tank 30, and the separation membrane module 11 is replaced.
In addition, as the operation time of the submerged membrane separation apparatus elapses, sludge gradually accumulates on the air diffusion means 15 and clogging occurs. If clogging occurs in the air diffuser 15, the discharge of aerated air is biased, and the membrane surface of the hollow fiber membrane 11a cannot be sufficiently cleaned, so the separation membrane unit 13 is pulled up from the reaction tank 30, Similar to the membrane surface of the hollow fiber membrane 11a, maintenance such as immersion cleaning and jet cleaning is performed.

  As a method of pulling up the separation membrane unit 13 from the reaction tank 30, a method of pulling up the separation membrane unit 13 with a chain block or a crane (not shown) is used. At the time of pulling up, the separation membrane unit 13 is pulled up using the guide rail 17 as a guide. That is, the separation membrane unit 13 is pulled up substantially vertically from the reaction tank 30 as the engaging portion 12b slides along the guide rail 17 as shown in FIG. The pulled up separation membrane unit 13 is installed in a chemical tank (not shown) for performing immersion cleaning, or in a position (not shown) for performing other maintenance.

  After performing maintenance on the separation membrane unit 13, the separation membrane unit 13 is moved above the reaction tank 30 by a chain block or a crane as shown in FIG. Then, the separation membrane unit 13 is pulled down substantially vertically, and the guide rail 17 is passed through the engagement hole 12 c provided in the engagement portion 12 b of the support 12. Further, by pulling down the separation membrane unit 13, the engaging portion 12b slides along the guide rail 17, and the separation membrane unit 13 is guided to a predetermined position in the reaction tank 30, and as shown in FIG. It is installed soaked in water. As described above, the separation membrane unit 13 is lifted from the reaction vessel 30, the separation membrane unit 13 is maintained, and the separation membrane unit 13 is immersed in the reaction vessel 30.

  In the submerged membrane separation apparatus 10 of the present invention described above, the separation membrane unit 13 including the separation membrane module 11 and the support 12 that supports the separation membrane module 11 is independent of the rectifying plate 18. The reaction tank 30 can be pulled up. As described above, the submerged membrane separation apparatus 10 is installed so that the separation membrane unit 13 can be pulled up into the reaction layer 30, and the current plate 18 (corresponding to the casing of the conventional submerged membrane separation apparatus) is the separation membrane unit. It is not included in 13 configurations. Therefore, the submerged membrane separation apparatus 10 according to the present invention is light in the separation membrane unit 13, and can easily lift the separation membrane unit 13 from the reaction vessel 30 and install the separation membrane unit 13 in the reaction vessel 30. . The submerged membrane separation apparatus 10 of the present invention can reduce the weight of the separation membrane unit to about 1/2 to 1/3 as compared with the conventional submerged membrane separation apparatus.

  Further, since the separation membrane unit 13 does not have a casing, the submerged membrane separation apparatus 10 is supported by the separation membrane unit 13 being exposed to the support 12 with the upper, lower, and lateral sides of the separation membrane module 11 exposed. When the separation membrane unit 13 is pulled up from the reaction tank 30, the upper, lower and side portions of the separation membrane module 11 can be exposed. Thereby, the immersion type membrane separation apparatus 10 can perform the washing | cleaning operation | work of the hollow fiber membrane 11a and the replacement | exchange operation | movement of the separation membrane module 11 quickly and easily after the separation membrane module 13 pulls up, and its maintainability is favorable. .

In the submerged membrane separation apparatus 10, the separation membrane module 11 is a hollow fiber membrane module. In the case of a hollow fiber membrane module, the membrane area per separation membrane module is as large as several tens of m ^2, and is excellent in the ability to permeate treated water. Therefore, the number of hollow fiber membrane modules mounted on one separation membrane unit can be reduced, and the number of hollow fiber membrane modules can be reduced, so that the time required for cleaning and replacement work can be shortened, and maintenance is further improved. It becomes.

  In the submerged membrane separation apparatus 10, the air diffuser 15 is supported by the separation membrane unit 13. Therefore, when the separation membrane unit 13 is lifted, the air diffuser 15 is also lifted. Thereby, it is not necessary to pull up the separation membrane unit 13 and the air diffuser 15 respectively, and the air diffuser 15 can be cleaned simultaneously with the hollow fiber membrane 11a, and the maintainability is further improved.

  In the submerged membrane separation apparatus 10, guide means (guide rail 17) for guiding the separation membrane unit 13 to a predetermined position is installed in the reaction tank 30. With this guide rail 17 as a guide, the separation membrane unit 13 is pulled up from the reaction vessel 30 and the separation membrane unit 13 is installed in the reaction vessel 30, so that the separation membrane unit 13 can be quickly and reliably placed at a predetermined position. In addition to being able to install, when the separation membrane unit 13 falls in the reaction tank 30 or when the separation membrane unit 13 is pulled up or installed, troubles such as damage to the separation membrane due to contact or collision with other members are reduced. be able to. Therefore, the separation membrane unit 13 can be pulled up and installed more quickly and easily.

  Further, in the submerged membrane separation apparatus 10, since the rectifying plate 18 is supported by the guide means (guide rail 17), the strength of the rectifying plate 18 is increased and the rectifying plate 18 is not easily bent. Further, since the current plate 18 serves to reinforce the guide rail 17, the possibility of the guide rail 17 being deformed due to contact / collision with the separation membrane unit 13 can be reduced. For this reason, the guide rail 17 and the baffle plate 18 can maintain the shape stably. Therefore, the stability at the time of pulling up and installing the separation membrane unit 13 increases, and the separation membrane unit 13 can be pulled up and installed more quickly and easily.

In the submerged membrane separation apparatus 10, a flat membrane module, a tubular module, or the like may be used as the separation membrane module in addition to the hollow fiber membrane module. In the case of a hollow fiber membrane module, the membrane area of one separation membrane module is as large as several tens of m ² compared to the membrane area of a flat membrane module or a tubular module of about several m ^2. The water permeability can be made excellent.

  Further, in the submerged membrane separation device 10, the filtered water is obtained by applying a negative pressure to the separation membrane module 11. However, the present invention is not limited to this, and the filtered water is obtained by natural headflow using a siphon. Also good.

  Further, in the submerged membrane separation apparatus 10, the guide rail 17 is configured to pass through the engagement hole 12 c of the engagement portion 12 b provided in the support 12, and the guide rail 17 is used as the guide means of the separation membrane unit 13. The present invention is not limited to this, and the separation membrane unit 13 may be movable along the guide rail 17 with other shapes and mechanisms. For example, H steel is used for the guide means, and a rod-like engagement portion is provided on the support so that the guide member can be engaged with the groove of the H steel, and the rod-like engagement portion is engaged with the groove of the H steel. Alternatively, a separation membrane module having a support structure that slides along the angle of the guide means may be used.

  In the submerged membrane separation apparatus 10, the rectifying plate 18 is fixed to the guide rail 17. However, the rectifying plate 18 only needs to be fixed in the reaction tank 30 independently of the separation membrane unit 13. It may be fixed in the reaction vessel 30 using a support member different from the above.

  In the above-described embodiment, the example in which the immersion type membrane separation device 10 is immersed in the reaction tank 30 that performs the microbial treatment of the water to be treated by the activated sludge method has been shown. The submerged membrane separation apparatus 10 may be immersed in a treatment tank that performs membrane filtration for the purpose of removing turbidity or a treatment tank that performs aggregation membrane filtration.

  By the way, in the conventional immersion type membrane separation apparatus, in the case of the immersion type membrane separation apparatus in which a plurality of separation membrane units are arranged in the reaction tank, as shown in FIG. Since the casing 101 is surrounded by the casing 102 (corresponding to the current plate 18), a large amount of casing plate material is required when the submerged membrane separation apparatus is assembled, and the installation cost increases.

  In the immersion type membrane separation apparatus of the present invention, in the case of an immersion type membrane separation apparatus in which a plurality of separation membrane units are arranged in a reaction tank, a configuration may be adopted in which each separation membrane unit is surrounded by a current plate. As shown in FIG. 3, the submerged membrane separation apparatus 50 in which a plurality of separation membrane units are installed using the current plate 18 in common may be used. The submerged membrane separation apparatus 50 includes five separation membrane units 51 installed so as to be able to be pulled out in the reaction tank 300, and a guide unit 53 that is fixed to the reaction tank 300 and is guided to the predetermined position. (Angle) and a rectifying plate 18 connected to the guide means 53 and disposed on the side of the separation membrane unit 51. In this embodiment, the current plate 18 surrounding the outer periphery is shared, and the current plates between the five separation membrane units 51 are omitted. Thereby, the quantity of the board | plate material for casings required at the time of the assembly of a submerged membrane separator can be saved, and the installation cost of a submerged membrane separator can be reduced.

Furthermore, in the present invention, as shown in FIG. 4, it may be a submerged membrane separation device 60 in which the two wall surfaces of the reaction tank 300 are used as a rectifying plate. Further, as shown in FIG. It may be a submerged membrane separation device 70 in which the wall surface is replaced with a current plate. In the submerged membrane separators 60 and 70, the amount of the plate material for the casing is further saved, so that the installation cost of the submerged membrane separator can be further reduced. Here, in the submerged membrane separation apparatuses 50, 60, and 70, the plurality of separation membrane units 51 can be individually pulled up.
In the submerged membrane separation apparatuses 50, 60, and 70, for convenience of explanation, illustration of aeration means, a separation membrane module and support of a separation membrane unit, various pipes, and the like are omitted. In the submerged membrane separation apparatuses 50, 60, and 70, five separation membrane units 51 are provided, but the number is not limited to this.

The submerged membrane separation apparatus of the present invention can be easily pulled up from the treatment tank (reaction tank) and installed in the treatment tank, and has good maintainability.
Furthermore, the immersion type membrane separation apparatus of the present invention can reduce the installation cost when the immersion type membrane separation apparatus includes a plurality of separation membrane units.

  The submerged membrane separation apparatus of the present invention is preferably installed in a wastewater treatment tank provided in a factory or commercial facility. The treatment tank in which the submerged membrane separation apparatus of the present invention is installed is preferably used in a membrane separation activated sludge method (MBR: Membrane Bioreactor), and an organic substance contained in water to be treated is efficiently treated by microorganism treatment using activated sludge. And clear filtered water can be efficiently obtained.

It is a side view which shows the state which immersed and installed the separation membrane unit in the reaction tank in the immersion type membrane separation apparatus of one embodiment of this invention. It is a side view which shows the state which pulled up the separation membrane unit of FIG. 1 from the reaction tank. It is a top view which shows the immersion type membrane separator of the other embodiment of this invention. It is a top view which shows the immersion type membrane separator of the other embodiment of this invention. It is a top view which shows the immersion type membrane separator of the other embodiment of this invention. It is a top view which shows the conventional immersion type membrane separator. It is a side view which shows the state which immersed and installed the separation membrane unit in the conventional immersion type membrane separator in the reaction tank. FIG. 8 is a side view showing a state where the separation membrane unit is pulled out of the reaction tank in the submerged membrane separation apparatus of FIG. 7.

Explanation of symbols

10, 50, 60, 70 Immersion type membrane separator 11 Separation membrane module 12 Support body 13, 51 Separation membrane unit 15 Aeration means 17, 53 Guide rail (guide means)
18 Current plate 30, 300 Reaction tank (treatment tank)
30a Bottom

Claims (5)

A separation membrane unit that is immersed in a treatment tank for storing the water to be treated and includes a separation membrane module that filters the water to be treated, and a support that supports the separation membrane module;
Aeration means disposed below the separation membrane module;
On the side of the separation membrane unit, a rectifying plate is disposed with a predetermined interval between the upper end and the water surface, and between the lower end and the bottom surface of the treatment tank, and obtains an airlift upward flow in the separation membrane unit and,
Guide means for guiding the separation membrane unit to a predetermined position in the processing tank;
Have
The guide means is installed in the treatment tank, and an upper end extends to the surface of the water, and the separation membrane unit can be pulled up independently with respect to the rectifying plate. Immersion membrane separator.   The submerged membrane separation device according to claim 1, wherein the separation membrane module is a hollow fiber membrane module.   The submerged membrane separation apparatus according to claim 1 or 2, wherein the air diffuser is supported by the separation membrane unit. The rectifying plate, submerged membrane separator according to claim 1, characterized in that it is supported by said guide means. The submerged membrane separation apparatus according to any one of claims 1 to 4 , wherein the plurality of separation membrane units are installed so as to share a current plate.

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