JP6453783B2 - Membrane treatment equipment - Google Patents

Description

  The present invention relates to a membrane processing apparatus, and more particularly to a membrane processing apparatus that does not require cleaning of an air diffuser.

  2. Description of the Related Art A solid-liquid separation device that immerses an immersion membrane filtration device in a solid-liquid separation tank and separates activated sludge and treated water is known. Since this submerged membrane filtration device is a solid-liquid separation by membrane filtration, clean treated water can be obtained stably, but there is a problem that clogging of the membrane occurs. In order to suppress the occurrence of clogging of such a membrane filtration device, a method of aeration from below the membrane filtration device is employed.

Japanese Patent No. 3382926

  Conventionally, Patent Document 1 discloses an air diffuser in which a diffuser tube is disposed below a membrane filtration device, bubbles are extracted from the diffuser tube, and the membrane is cleaned by rising bubbles. A diffuser tube used in the diffuser is provided with a plurality of diffuser holes.

  However, in the case of this air diffuser, the air diffuser becomes a gas-liquid interface, and sludge or the like enters and exits the air diffuser. The sludge that has entered the diffuser pipe is dried by the diffused air and fixed to the inner surface of the pipe. The adhered sludge needs to be cleaned periodically by pulsation due to the air lift effect by opening the valve at the end of the diffuser pipe that has been raised above the liquid level of the water tank in which the membrane filtration device is installed.

  Accordingly, an object of the present invention is to provide a membrane processing apparatus that does not require cleaning of the diffuser.

  The other subject of this invention becomes clear by the following description.

  The above problems are solved by the following inventions.

(Claim 1)
A tank,
An air diffuser immersed in the water tank;
A membrane filtration device provided at the top of the air diffuser and immersed in the water tank;
With
The air diffuser is
(A) an air diffuser having a plurality of air diffusers at the lower end;
(B) A front plate and a back plate that are arranged side by side so as to be in close contact with both side surfaces of the air diffuser and extend downward from the lower end of the air diffuser, and upstream of the front plate and the back plate An upstream partition plate and a downstream partition plate that seal openings formed on the side and the downstream side, and below the diffuser tube, the front plate and the back plate, and the upstream partition plate and the downstream The side partition plate comprises a diffuser hole cover that surrounds at least two of the diffuser holes , the bottom of which is released.
A plurality of vertical slits are provided in parallel in the direction along the air diffuser at the lower part of each of the front plate and the back plate constituting the air diffuser cover of (B),
A space is provided between the lower end of the diffuser tube and the gas-liquid interface so as to have a gas-liquid interface at a position that is at least 5 mm away from the lower end of the diffuser tube and in the range of the plurality of slits in the vertical direction. A film processing apparatus characterized by being formed.
(Claim 2)
The film processing apparatus according to claim 1, wherein an interval between the front plate and the back plate in the air diffuser is configured to become narrower downward.

  According to the present invention, it is possible to provide a film processing apparatus that does not require cleaning of the diffuser.

The figure which shows embodiment using an example of the film processing apparatus of this invention The figure which looked at the diffuser in FIG. 1 from the lower part The perspective view which shows the diffuser hole cover in embodiment of this invention Sectional drawing of the diffuser which shows the driving | running state in embodiment of this invention The figure which looked at the state where an example of the diffuser was immersed in the water tank from the bottom of the water tank The figure which shows the aspect in which the diffuser cover is divided into five blocks The figure which shows the aspect by which the membrane filtration apparatus was comprised with five membrane modules. The figure which shows the aspect by which the diffuser installation site and the membrane filtration device installation site are provided The figure which shows an example of the structure of a membrane module The figure which shows the other example of a diffuser Xi-xi sectional view of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of a film processing apparatus of the present invention.
1 is a water tank, 2 is a membrane filtration device immersed in the water tank 1, and 3 is an air diffuser installed below the membrane filtration device 2. 4 is a blower for aeration.

  If the air diffuser 3 is installed below the membrane filtration device to raise the bubbles, it can contribute to membrane cleaning of the membrane filtration device.

  Examples of the membrane used in the membrane filtration device 2 include a microfiltration membrane and an ultrafiltration membrane. The membrane form may be either a flat membrane type or a tubular type.

  The air diffuser 3 includes an air diffuser tube 30 having a plurality of air diffuser holes at the lower end, and an air diffuser cover 31 below the air diffuser tube 30. The air diffuser cover 31 is formed to extend downward from the lower end of the air diffuser 30.

  The air diffuser 30 has, for example, a plurality of air diffusers 300 as shown in FIG. 2 is a view of the air diffuser in FIG. 1 as viewed from below. In the illustrated example, one diffuser hole cover 31 is provided for two diffuser holes 300, 300.

  As shown in FIG. 3, the air diffuser cover 31 includes a front plate 310 and a back plate 311 arranged side by side so as to closely face both side surfaces of the air diffuser.

  Reference numerals 312 and 313 denote an upstream partition plate and a downstream partition plate that seal openings formed on the upstream side and the downstream side of the front plate 310 and the back plate 311. The upstream partition plate 312 and the downstream partition plate 313 are opposed to each other.

  The front plate 310 and the back plate 311 face each other, the upstream partition plate 312 and the downstream partition plate 313 face each other, and the front plate 310 and the back plate 311 touch the upstream partition plate 312 and the downstream partition plate 313. By being provided orthogonally, the air diffuser cover 31 is formed in a rectangular cylindrical body. The upper and bottom portions of the cylindrical air diffuser cover 31 are open, 314 is an opening in the bottom portion, and 315 is an opening in the upper portion.

  The front plate 310 and the back plate 311 are juxtaposed so as to closely face both side surfaces of the air diffuser 30. Here, close contact means that the air in the space 316 formed by the lower portion of the diffuser tube 30 and the diffuser hole cover 31 is in contact with the lower slit 317 so as to ensure airtightness from leaking outside. is there.

  Examples of means for bringing them into close contact include welding (welding) or adhesion. For example, when the front plate 310 and the back plate 311 are formed of a resin plate such as vinyl chloride, the resin plate can be welded to be fixed to the intermediate outer periphery of the air diffusion tube 3.

  It is preferable that the upstream partition plate 312 and the downstream partition plate 313 are formed integrally with the front plate 310 and the back plate 311 to ensure airtightness in the space 316.

  The front plate 310 and the back plate 311 are preferably formed so as to be inclined inward and to have a narrow width as shown in FIGS. This is to prevent air from leaking from the bottom of the air diffuser cover 31. By causing pressure loss with respect to the air pressure of the air discharged from the air diffuser 300 of the air diffuser 30, it is possible to prevent the gas-liquid interface from being easily lowered to the bottom and to prevent leakage.

  A cutout corresponding to the outer shape of the air diffuser tube 30 is formed in the upper part of the upstream divider plate 312 and the downstream divider plate 313, and the cutout is in contact with the air diffuser tube 30 to ensure the airtightness in the space 316. It has become so. The shape of the notch is not particularly limited as long as it corresponds to the outer shape of the air diffusing tube 30.

  The air diffuser 30, the front plate 310, the back plate 311, the upstream partition plate 312, and the downstream partition plate 313 are preferably formed using resin plates such as polyethylene, polypropylene, vinyl chloride, and acrylic resin.

  A plurality of slits 317 arranged in parallel at the lower portions of the front plate 310 and the back plate 311 are formed in the vertical direction in the direction along the air diffuser 30.

  The width of the slit 317 is preferably in the range of 4 to 12 mm, and the length is preferably in the range of 15 to 30 mm.

  That is, as shown in FIG. 4, the lower end of the air diffuser 30 (the part of the air diffuser 300) is A, the upper end of the slit 317 is B1, and the lower end of the slit 317 (the lower end of the front plate 310 and the back plate 311) is B2. In some cases, the slit 317 is formed at a position at least 5 mm away from the lower end A of the air diffuser 30. By forming in this way, the gas-liquid interface W is formed in a range from B1 to B2, which is a region range of the slit 317 in the vertical direction. The aforementioned space 316 is formed between the lower end of the air diffuser 30 and the gas-liquid interface W. The air diffuser 300 may be provided slightly shifted from the lower end of the air diffuser 30 to the left or right in the circumferential direction. In this case, A is the lowest part of the air diffusion hole 300.

  In the membrane processing apparatus shown in FIG. 1, when air is supplied from the blower 4 to the diffuser tube 30, air is sent from the diffuser holes 300 to the space 316 in the diffuser hole cover 31.

  The pressure of the air supplied into the space 316 is adjusted so that the gas-liquid interface W can be maintained at a predetermined position.

  The gas-liquid interface W is formed in a range from B1 to B2 that is a region range of the slit 317 in the vertical direction. By doing in this way, the air supplied in the space 316 becomes a bubble from a slit, is discharged | emitted outside, and functions effectively for the membrane washing | cleaning of an upper membrane filtration apparatus.

  By forming the gas-liquid interface W as described above, there is an effect that it is possible to avoid a situation where air is discharged from the lower part of the space 316 and a situation where bubbles cannot be formed.

  By forming the slit 317 at a position at least 5 mm away from the lower end A of the air diffuser 30, the gas-liquid interface W is formed as described above. As a result, sludge and the like are formed in the space 316. Even if splashes, since it is away from the air holes, it is possible to prevent sludge from adhering to the air holes.

  In the preferred embodiment of the present invention, the bottom of the air diffuser cover 31 is released. Since the gas-liquid interface W is in the range of the slit by releasing the bottom, even if sludge adheres to the slit due to the liquid in the water tank, drying of the sludge can be prevented. As a result, accumulation of sludge and the like can be prevented, and the clogging of the slit can be prevented.

  Furthermore, by maintaining the air pressure in the space 316 to such an extent that no leakage is diffused from the bottom, pulsation can be prevented and stable aeration can be performed.

  In this embodiment, the air diffuser cover 31 has a form that hangs downward from the side surface of the air diffuser tube 30 and is not a form that is provided at the tip of a single air diffuser nozzle as in the prior art. The air diffuser cover 31 is formed with a space 316 that receives air ejected from one or more air diffusers.

  In the example shown in the figure, air is supplied to the space 316 from the two air holes 300, 300. However, if one air hole cover 31 is provided for each of a certain number of air holes, Due to the orifice effect of the air diffuser hole itself, the air pressure of the air diffuser 30 is reduced by the pressure loss, and the pressure in the space 316 can be kept uniform.

Next, another embodiment of the present invention will be described.
5-8 is a figure which shows the other embodiment of this invention.
In this embodiment, an air diffuser is installed near the bottom of the water tank, a membrane filtration device is provided on the air diffuser, and both the air diffuser and the membrane filtration device are immersed in water.

  As shown in FIG. 8, the water tank 1 is provided with a membrane filtration device installation site 2A and an air diffuser installation site 3A, and the membrane filtration device 2 and the air diffusion device shown in FIGS. 3 is installed.

  FIG. 5 is a view of an example of the air diffuser as seen from below the water tank when immersed in the water tank. The air diffusing device 3 shown in the figure has a configuration in which two air diffusing tubes 30 and 30 are connected from a header tube 30A.

  Below the air diffuser 30, as shown in FIG. 6, one air diffuser cover 31 is provided for the two air diffusers 300, 300, which are divided into five blocks as a whole. The membrane module 20 which comprises the membrane filtration apparatus 2 is arrange | positioned upwards.

  FIG. 7 shows an embodiment of the membrane filtration device 2 constituted by five membrane modules. In the figure, 20 is a membrane module of the membrane filtration device 2, and 21 is a suction header tube.

  The permeated water sucked from the membrane module 20 is sent to the suction holes 210, 210,... Via a hose (indicated by reference numeral 22 in FIG. 8), and collected in the suction header pipe 21 to obtain permeated water.

  An example of the structure of the membrane module 20 will be described with reference to FIG. As shown in the figure, the separation membrane 200 is provided on both sides of the channel material 201. Although the channel material 201 is not particularly limited, a mesh body can be preferably used. The net-like body may be a resin net or a metal net. Reference numeral 202 denotes a suction pipe, which has a plurality of openings 203 for introducing permeated water. The opening 203 may be a slit in any direction with respect to the central axis of the suction pipe 202.

  The separation membrane 200 and the channel material 201 are installed around the suction pipe 202 at a predetermined interval. A gasket 204 is provided to place the membranes at predetermined intervals and to ensure sealing.

  When the suction pipe 202 is sucked by a suction pump (not shown), the raw membrane water outside the separation membrane 200 passes through the separation membrane 200 and enters the suction pipe 202 from the opening 203 provided at a position corresponding to the flow path material 201. .

  In the above aspect, although the membrane filtration apparatus was comprised with five membrane modules, the number is not limited and can increase / decrease according to the target permeated water amount. Further, if the membrane area of one membrane filtration device is increased, the number of membrane filtration devices installed can be reduced.

  In the present invention, bubbles are generated from the air diffusing device 3 to clean the upper film and the air diffusing device itself does not need to be cleaned, so that the cleaning equipment and the cleaning work can be omitted.

Next, another example of the air diffuser will be described based on FIGS. 10 and 11.
In the air diffuser shown in the figure, a plurality of air diffuser holes 300 are formed at the lower end of the air diffuser 30.

  A diffuser nozzle 301 extending downward is provided so as to surround each of the diffuser holes 300. The lower end of the air diffusion nozzle 301 is open. A small hole 302 is provided on the lower side surface of the air diffusion nozzle 301. The small holes 302 are not particularly limited, but the positions where the small holes 302 are installed can be different between adjacent nozzles as illustrated. Specifically, as shown in the figure, one of the diffuser nozzles 301 forms a small hole 302 on the front side of the nozzle, and the adjacent nozzle forms a small hole 302 on the back side. The air diffuser 300 may be provided slightly shifted from the lower end of the air diffuser 30 to the left or right in the circumferential direction.

  Thus, a gas-liquid interface is formed in the vicinity of the small hole 302 and a space 316 is formed between the lower end of the air diffuser 30 and the gas-liquid interface.

1: Water tank 2: Membrane filtration device 20: Membrane module 200: Separation membrane 201: Channel material 202: Suction pipe 203: Opening 204: Gasket 21: Suction header pipe 210: Suction hole 22: Hose 3: Air diffuser 30A: Header pipe 30: Air diffuser 300: Air diffuser 301: Air diffuser nozzle 302: Small hole 31: Air diffuser cover 310: Front plate 311: Back plate 312: Upstream partition plate 313: Downstream partition plate 314, 315: Opening 316 : Space 317: Slit 4: Blower

Claims (2)

A tank,
An air diffuser immersed in the water tank;
A membrane filtration device provided at the top of the air diffuser and immersed in the water tank;
With
The air diffuser is
(A) an air diffuser having a plurality of air diffusers at the lower end;
(B) A front plate and a back plate that are arranged side by side so as to be in close contact with both side surfaces of the air diffuser and extend downward from the lower end of the air diffuser, and upstream of the front plate and the back plate An upstream partition plate and a downstream partition plate that seal openings formed on the side and the downstream side, and below the diffuser tube, the front plate and the back plate, and the upstream partition plate and the downstream The side partition plate comprises a diffuser hole cover that surrounds at least two of the diffuser holes , the bottom of which is released.
A plurality of vertical slits are provided in parallel in the direction along the air diffuser at the lower part of each of the front plate and the back plate constituting the air diffuser cover of (B),
A space is provided between the lower end of the diffuser tube and the gas-liquid interface so as to have a gas-liquid interface at a position that is at least 5 mm away from the lower end of the diffuser tube and in the range of the plurality of slits in the vertical direction. A film processing apparatus characterized by being formed.   The film processing apparatus according to claim 1, wherein an interval between the front plate and the back plate in the air diffuser is configured to become narrower downward.

Images