JP2017023903A - Wastewater treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deal with vibration without making the removal of an aeration device difficult.SOLUTION: A wastewater treatment apparatus comprises one or more water treatment tanks, an aeration device disposed in a particular water treatment tank among the one or more water treatment tanks, piping for supplying gas to the aeration device, a connection part that removably connects the piping and the aeration device together, a first fit part removably attached to the aeration device, and a second fit part fixed in the particular water treatment tank. The second fit part is configured to be fitted in the first fit part when the aeration device is disposed at a predetermined fixing position in the particular water treatment tank. The endurance to wear of the second fit part is higher than the endurance to the wear of the first fit part.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to an air diffuser provided in a wastewater treatment apparatus.

  Conventionally, a wastewater treatment apparatus has been provided with an air diffuser for supplying oxygen to the water treatment tank, stirring the water treatment tank, and the like. As the air diffuser, for example, an air diffuser having a plurality of discharge holes for discharging gas (for example, air) is used. In addition, the air diffuser may be removed from the water treatment tank for maintenance such as releasing the blockage. In order to arrange the air diffuser again at an appropriate position, a technique has been proposed in which a guide groove is provided in the water treatment tank and the air diffuser is arranged along the guide groove.

JP 2001-104986 A JP-A-11-156389 JP 2011-214737 A

  The air diffuser tends to vibrate when air is diffused. There is a possibility that a member (for example, a guide groove) for positioning the diffuser may be damaged by the vibration of the diffuser. In many cases, it takes time and effort to repair the members provided in the water treatment tank. Further, if the fixing of the air diffuser is strengthened to prevent breakage, it may be difficult to remove the air diffuser.

  The present disclosure discloses a technique for dealing with vibrations without making it difficult to remove the diffuser.

  For example, the present disclosure discloses the following application examples.

[Application Example 1]
Wastewater treatment equipment,
One or more water treatment tanks;
An air diffuser disposed in a specific water treatment tank among the one or more water treatment tanks;
Piping for supplying gas to the air diffuser;
A connecting part for detachably connecting the pipe and the air diffuser;
A first fitting portion detachably attached to the air diffuser;
It is fixed in the specific water treatment tank, and is configured to fit into the first fitting portion when the air diffuser is disposed at a predetermined fixed position in the specific water treatment tank. A second fitting portion;
With
The durability against wear of the second fitting portion is higher than the durability against wear of the first fitting portion.
Wastewater treatment equipment.

  According to this configuration, the diffuser can be easily removed from the water treatment tank by removing the diffuser from the pipe. In addition, the first fitting part attached to the air diffuser is fitted into the second fitting part fixed in the specific water treatment tank, thereby suppressing the positional deviation of the air diffuser in the water treatment tank. it can. Further, when the air diffuser vibrates due to air diffusion, the first fitting portion and the second fitting portion can be rubbed together. Here, since the durability with respect to the wear of the second fitting portion is higher than the durability with respect to the wear of the first fitting portion, the breakage of the second fitting portion is suppressed. Therefore, it is possible to reduce the possibility of requiring a heavy work such as replacement or repair of the second fitting portion. Even if the first fitting portion is damaged, the first fitting portion can be easily replaced with a new one by removing the air diffuser from the water treatment tank. Thus, even when the first fitting portion and the second fitting portion are rubbed against each other, the first fitting portion that is relatively easily damaged can be easily replaced with a new one. Thus, the technique of the application example 1 can cope with vibration without making it difficult to remove the air diffuser.

[Application Example 2]
The wastewater treatment apparatus according to Application Example 1,
The first fitting portion and the second fitting portion are formed of different materials,
The wear resistance of the material of the second fitting portion is higher than the wear resistance of the material of the first fitting portion,
Wastewater treatment equipment.

  According to this configuration, since the wear of the first fitting portion proceeds earlier than the wear of the second fitting portion, the durability against the wear of the second fitting portion can be easily increased. Higher durability than wear.

[Application Example 3]
The wastewater treatment apparatus according to Application Example 1 or 2,
A guide for guiding the air diffuser from above to the fixed position;
Wastewater treatment equipment.

  According to this configuration, the air diffuser can be easily arranged at the fixed position.

[Application Example 4]
The wastewater treatment apparatus according to any one of Application Examples 1 to 3,
In the state where the air diffuser is disposed at the fixed position, the air diffuser includes a pressing portion that presses the air diffuser downward from above.
Wastewater treatment equipment.

  According to this configuration, since the air diffuser is pressed downward by the pressing portion, it is possible to suppress the air diffuser from floating from the fixed position due to the air diffuser. Moreover, since the vibration of the air diffusing device due to the air diffusion can be suppressed, the wear of the first fitting portion and the second fitting portion can be suppressed.

  In addition, the technique disclosed in this specification can be realized in various modes, for example, in a mode such as a waste water treatment method and a waste water treatment device.

It is the schematic which shows the air diffusion apparatus as one Example. It is explanatory drawing of the diffuser. It is a perspective view which shows a mode that the diffuser 100 is installed on the base 400. FIG. It is the schematic of the water treatment tank 610. It is the schematic of the water treatment tank 610. It is a block diagram which shows the more specific Example of a waste water treatment equipment. It is the schematic block diagram which looked at the waste water treatment equipment 900 from the side. FIG. 6 is a schematic view of another embodiment of an air diffuser. FIG. 6 is a schematic view of another embodiment of an air diffuser.

A. First embodiment:
FIG. 1 is a schematic diagram showing an air diffuser as an example. FIG. 1 (A) shows the waste water treatment device 600 and the air diffuser 100 removed from the water treatment tank 610 of the waste water treatment device 600. FIG. 1B shows the wastewater treatment device 600 and the air diffuser 100 disposed in the water treatment tank 610 of the wastewater treatment device 600. The waste water treatment device 600 is a device for treating waste water such as domestic waste water from ordinary households and industrial waste water from industrial facilities such as medical facilities and stores. In the example of FIGS. 1A and 1B, the waste water treatment apparatus 600 has an outer wall 690 that houses a plurality of water treatment tanks, and a partition wall (not shown) that partitions the inside of the outer wall. The outer wall 690 has a substantially cylindrical portion that extends in the horizontal direction, and end walls that close both ends of the substantially cylindrical portion. The waste water treatment apparatus 600 has a plurality of water treatment tanks formed by an outer wall and a partition wall. The water treatment tank 610 is one of a plurality of water treatment tanks. The water treatment tank 610 is an aerobic treatment tank that performs aerobic treatment of wastewater using, for example, aerobic microorganisms. The outer wall 690 is made of, for example, glass fiber reinforced plastics. Hereinafter, the glass fiber reinforced plastic is also simply referred to as “FRP”. The outer wall 690 may be formed of another material (for example, a resin such as dicyclopentadiene) instead of the FRP.

  1A and 1B are schematic views of a water treatment tank 610. FIG. The Z direction in the figure is a vertically upward direction, the Y direction is a direction in which the waste water treatment apparatus 600 extends, and the X direction is a direction perpendicular to the Y direction and the Z direction. The X direction and the Y direction are directions perpendicular to the Z direction, that is, horizontal directions. Hereinafter, the X direction is also referred to as “+ X direction”, and the direction opposite to the X direction is also referred to as “−X direction”. The same applies to the Y direction, the direction opposite to the Y direction, the Z direction, and the direction opposite to the Z direction.

  A manhole opening 619 is formed in the upper part of the water treatment tank 610. A pipe 510 for connecting a blower (not shown) is provided in the vicinity of the manhole opening 619 of the water treatment tank 610. The pipe 510 has a connection pipe 512 and a valve 514. The connecting pipe 512 is fixed to the outer wall 690 while penetrating the outer wall 690 of the waste water treatment apparatus 600. Outside the outer wall 690, a blower (not shown) is connected to the connection pipe 512. A valve 514 for adjusting the gas flow rate is connected to the connection pipe 512 in the outer wall 690. A connection portion 516 for detachably connecting a pipe is provided on the opposite side of the valve 514 from the connection pipe 512. In the present embodiment, the connection portion 516 is a so-called “union”. The union includes a nut. By rotating the nut, two pipes (here, the valve 514 and an air supply pipe 300 described later) can be connected and disconnected.

  In the water treatment tank 610, a base 400 for supporting the air diffuser 100, a guide bar 490 for guiding the air diffuser 100 to a predetermined position on the base 400, and a guide bar 490 fixed to the base 400 And a fixing portion 480 to be provided. The table 400 is fixed to the bottom of the substantially cylindrical water treatment tank 610. For example, the base 400 is fixed to the outer wall 690 by forming an FRP layer on the boundary portion between the outer wall 690 and the base 400. Alternatively, the base 400 may be fixed to the outer wall 690 by other methods such as rivet connection.

  The base 400 includes a flat plate 410 that extends in a substantially horizontal direction. The flat plate 410 is formed with two through holes 420a and 420b penetrating in the vertical direction. The fixing portion 480 is fixed on the flat plate 410 (for example, rivet connection). The lower end portion of the guide bar 490 is fixed to the fixing portion 480 (for example, rivet connection). The guide rod 490 extends from the fixed portion 480 to the vicinity of the manhole opening 619 in the Z direction side. Note that the base 400 is formed of, for example, FRP. Further, the fixing portion 480 and the guide rod 490 are made of polyvinyl chloride.

  The air diffuser 100 includes a discharge unit 200 that discharges gas, two protrusions 290a and 290b that are detachably attached to the discharge unit 200, an air supply pipe 300 that supplies gas to the discharge unit 200, and a guide rod. And a guide plate 390 having a through hole 392 through which 490 passes. The discharge unit 200 is a tubular device through which gas passes. A plurality of through holes 202 for gas discharge are formed on the lower surface of the discharge unit 200. The supply pipe 300 is connected to the discharge unit 200 and extends from the discharge unit 200 toward the Z direction. The guide plate 390 is fixed to the discharge unit 200. The protrusions 290a and 290b protrude downward from the discharge part 200. These elements 200, 290a, 290b, 300, 390 of the diffuser 100 are made of, for example, polyvinyl chloride.

  When disposing the air diffuser 100 in the water treatment tank 610, the air diffuser 100 is inserted downward from the manhole opening 619. Although details will be described later, the air diffuser 100 is lowered in a state where the guide rod 490 is inserted into the through hole 392 of the guide plate 390. Then, the two protruding portions 290a and 290b are inserted into the through holes 420a and 420b of the base 400, respectively. Thus, the protrusions 290a and 290b fit into the through holes 420a and 420b. Thereby, the horizontal positioning of the discharge part 200 (as a result, the diffuser 100) is performed. Hereinafter, the protrusions 290a and 290b of the air diffuser 100 are also referred to as first fitting portions 290a and 290b. The portions 422a and 422b forming the through holes 420a and 420b in the table 400 are also referred to as second fitting portions 422a and 422b. The second fitting portions 422 a and 422 b are annular portions that form the inner peripheral surfaces of the through holes 420 a and 420 b in the flat plate 410.

  The upper end portion 310 of the air supply pipe 300 of the diffuser 100 is connected to the connection portion 516 of the pipe 510. Thus, gas from a blower (not shown) is supplied to the discharge unit 200 through the pipe 510 and the air supply pipe 300 and discharged from the plurality of through holes 202. A user (for example, an administrator of the wastewater treatment apparatus 600) can remove the air diffuser 100 from the water treatment tank 610 through the manhole opening 619 by removing the air supply pipe 300 from the connection portion 516.

  FIG. 2 is an explanatory diagram of the air diffuser 100. 2A is a top view, FIG. 2B and FIG. 2C are side views, and FIG. 2D is a bottom view. FIG. 2E is a cross-sectional view of the protrusion 290a. As shown in FIG. 2A, the discharge unit 200 includes three pipe portions 210, 220, and 230 that are parallel to the Y direction, and two pipe portions 240 and 250 that are parallel to the X direction. ing. The dotted lines in the figure are virtual lines indicating the pipe portions 210, 220, 230, 240, 250. The three pipe portions 210, 220, and 230 are arranged in this order in the X direction. The outer pipe portions 210 and 230 are also called outer pipe portions 210 and 230, and the inner pipe portion 220 is also called an inner pipe portion 220. The pipe part 240 on the −Y direction side connects the end parts on the −Y direction side of the three pipe parts 210, 220, and 230. The pipe portion 250 on the + Y direction side connects the end portions on the + Y direction side of the three pipe portions 210, 220, and 230. As shown in FIG. 2D, a plurality of through holes 202 are formed on the lower surfaces of the pipe portions 210 to 250.

  As shown in FIG. 2A, the four corners of the discharge unit 200, that is, the connection portions of the outer pipe portions 210 and 230 and the pipe portions 240 and 250 parallel to the X direction are L-shaped pipes. It is formed of a member PL (also called “elbow”). A connecting portion between the pipe portions 240 and 250 parallel to the X direction and the inner pipe portion 220 is formed of a T-shaped pipe member PT.

  As shown in FIGS. 2A to 2C, the central portions of the outer pipe portions 210 and 230 have T-shaped pipe members 212 and 232 forming branch pipes 214 and 234 protruding downward. It is formed with. Projections 290a and 290b are attached to the branch pipes 214 and 234, respectively. The protrusions 290a and 290b protrude downward from the branch pipes 214 and 234. FIG. 2E is a cross-sectional view of the branch pipe 214 and the protruding portion 290a attached to the branch pipe 214. This cross-sectional view is a cross section cut along a plane including the central axis CL of the branch pipe 214.

  As illustrated, the protruding portion 290a is a member having a straight pipe 292 and a flange 294 formed in the middle of the pipe 292. A male screw 292s is formed on the outer peripheral surface of the portion of one side of the pipe 292 as viewed from the flange 294 (+ Z direction side in FIG. 2E). An internal thread 214s is formed on the inner peripheral surface of the end portion of the branch pipe 214. The protrusion 290a is attached to the branch pipe 214 by the male screw 292s of the protrusion 290a being screwed into the female screw 214s of the branch pipe 214. The protrusion 290a can be easily removed from the branch pipe 214 by rotating the protrusion 290a in the opposite direction. As described above, the protruding portion 290a is detachably attached to the branch pipe 214 (that is, the discharge portion 200). As will be described later, the protrusion 290a is removed in order to replace the protrusion 290a with a new one.

  Further, the end portion of the projecting portion 290 a inserted into the branch pipe 214 of the pipe 292 is closed with a cap 280. Accordingly, the gas is prevented from being discharged from the protruding portion 290a.

  Although illustration is omitted, the configurations of the branch pipe 234 and the protruding portion 290b of the pipe member 232 are the same as the configurations of the branch tube 214 and the protruding portion 290a of FIG.

  As shown in FIGS. 2A to 2C, the central portion of the inner pipe portion 220 is formed by a T-shaped pipe member 222 that forms a branch pipe 224 protruding upward. An air supply pipe 300 is connected to the branch pipe 224. The supply pipe 300 extends from the branch pipe 224 toward the Z direction. A guide plate 390 is fixed to the branch pipe 224 (for example, adhesion using an adhesive). As shown in FIG. 2C, the guide plate 390 protrudes from the branch pipe 224 toward the + X direction. As shown in FIG. 2A, the through hole 392 of the guide plate 390 is disposed between the inner pipe portion 220 and the outer pipe portion 230 when viewed from below.

  FIG. 3 is a perspective view showing a state where the air diffuser 100 is installed on the table 400. In the figure, perspective views of the air diffuser 100, the base 400, and the guide rod 490 are shown. The work of installing the diffuser 100 on the table 400 proceeds in the order of FIG. 3 (A), FIG. 3 (B), and FIG. 3 (C).

  By moving the air diffuser 100 onto the manhole opening 619 (FIG. 1), the air diffuser 100 is disposed above the upper end of the guide bar 490, as shown in FIG. Here, when looking downward, the through hole 392 of the guide plate 390 approximately overlaps the guide rod 490, the protrusion 290a approximately overlaps the through hole 420a, and the protrusion 290b approximately overlaps the through hole 420b. The position of the air diffuser 100 is adjusted.

  In this state, the air diffuser 100 is lowered. Then, the guide bar 490 is inserted into the through hole 392 of the guide plate 390. In this state, the air diffuser 100 is further lowered downward (FIG. 3B). Thereby, the air diffuser 100 moves downward along the guide rod 490. Then, the discharge unit 200 reaches the flat plate 410.

  As shown in FIG. 3C, the protruding portions 290a and 290b are inserted into the through holes 420a and 420b of the flat plate 410, respectively. Thereby, the position shift of the horizontal direction of the diffuser 100 is suppressed. When the guide bar 490 is inserted into the through hole 392 of the guide plate 390, the fixing position of the guide bar 490 on the flat plate 410 is such that the protruding portions 290a and 290b are positioned near the through holes 420a and 420b. It is decided in advance. When the protrusions 290a and 290b reach the flat plate 410, the protrusions 290a and 290b may be separated from the through holes 420a and 420b. In this case, the user can easily adjust the position of the air diffuser 100 in the horizontal direction (for example, by rotating the air diffuser 100 around the guide rod 490), thereby easily extending the protrusions 290a and 290b. Can be inserted into the through holes 420a and 420b.

  FIG. 4 is a schematic view of the water treatment tank 610 viewed in the Y direction. FIG. 5 is a schematic view of the water treatment tank 610 viewed downward from the manhole opening 619. 4 and 5 both show a state in which the air diffuser 100 is installed in the water treatment tank 610. FIG. 5 shows only a portion near the manhole opening 619.

  FIG. 4 shows a part of the outer wall 690 forming the manhole opening 619, the air diffuser 100, the base 400, the guide rod 490, the pipe 510, and the support portion 550. . Hereinafter, these devices 100, 400, 490, 510, and 550 as a whole are also referred to as an aeration system 700. In FIG. 4, the cross section cut | disconnected by the plane containing the central axis of through-hole 420a, 420b is shown as the flat plate 410 of the base 400. FIG. The appearance of the other members is shown. In the present embodiment, the inner diameter D1 of the through holes 420a and 420b is smaller than the outer diameter D2 of the flange 294 of the protrusions 290a and 290b. When the protrusions 290a and 290b are inserted into the through holes 420a and 420b, the lower surface of the flange 294 contacts the upper surface of the flat plate 410, so that the air diffuser 100 is supported by the flat plate 410. The The air diffuser 100 is installed at such a position (hereinafter also referred to as “fixed position”).

  As shown in FIG. 4, the air supply pipe 300 of the air diffuser 100 includes a vertical pipe 302 extending from the branch pipe 224 in the + Z direction, an L-shaped pipe member 304 connected to the upper end of the vertical pipe 302, and a pipe And a pipe member 306 extending from the member 304 to the −X direction side. An end portion on the −X direction side of the pipe member 306 corresponds to the upper end portion 310 of the air supply pipe 300.

  As shown in FIGS. 4 and 5, a support portion 550 that supports the air supply pipe 300 and the guide rod 490 is provided on the upper portion of the water treatment tank 610. As shown in FIG. 5, the support portion 550 includes a first rod 552 extending in parallel to the Y direction, a fixing portion 551 a that fixes an end portion on the + Y direction side of the first rod 552 and the outer wall 690, and a first rod. A fixing portion 551b for fixing the end portion on the −Y direction side of 552 and the outer wall 690, a U bolt 554 for fixing the air supply pipe 300 to the first rod 552, and the first rod 552 to the X A second rod 556 extending in the direction and a pipe holder 558 fixed to the second rod 556 are provided. Pipe holder 558 holds guide bar 490. As a fixing method between the fixing portions 551a and 551b and the outer wall 690, a fixing method between the fixing portions 551a and 551b and the first rod 552, and a fixing method between the first rod 552 and the second rod 556, any method can be used. Can be adopted (for example, rivet connection).

  As shown in FIG. 4, the first rod 552 is located above the air supply pipe 300 (specifically, the pipe member 304). The pipe member 304 is fixed to the first rod 552 by a U bolt 554 surrounding the pipe member 304. When the air diffuser 100 is installed in the water treatment tank 610, the air diffuser 100 is disposed in the water treatment tank 610 through the + X direction side of the first rod 552. Then, the upper portion (here, the pipe member 304) of the air supply pipe 300 is moved below the first rod 552 in a state where the protruding portions 290a and 290b are inserted into the through holes 420a and 420b. The upper end portion 310 is connected to the connection portion 516, and the pipe member 304 is fixed to the first rod 552 with a U bolt 554. Further, the upper part of the guide bar 490 is fixed to the pipe holder 558.

  When the air diffuser 100 diffuses air, the air diffuser 100 is filled with gas, so that buoyancy acts on the air diffuser 100. As a result, the air diffuser 100 attempts to rise. The 1st stick | rod 552 located above the diffuser 100 hold | suppresses the diffuser 100 toward upper direction from the downward direction. Therefore, the first rod 552 can suppress the air diffuser 100 from floating.

  In addition, the distance L1 is shown in the drawing. The distance L1 is the vertical length of a portion of the protrusions 290a and 290b that is located below the openings 420ao and 420bo above the through holes 420a and 420b. That is, in order to remove the protrusions 290a and 290b from the through holes 420a and 420b, it is necessary to move the air diffuser 100 upward by a distance L1 or more. In the present embodiment, the vertical gap g1 between the first rod 552 and the air supply pipe 300 is shorter than the distance L1 in a state where the air diffuser 100 is disposed at the fixed position. Therefore, the protrusions 290a and 290b are prevented from coming out of the through holes 420a and 420b. In addition, since the diffuser 100 can be fixed in the water treatment tank 610 as described above, when the wastewater treatment device 600 is manufactured, the wastewater treatment device 600 is tilted so that the manhole opening 619 faces the horizontal direction instead of upward. The worker can proceed with the work.

  The air diffuser 100 can be removed from the water treatment tank 610 for maintenance such as releasing the blockage. The removal of the air diffuser 100 proceeds according to a procedure reverse to the procedure of installing the air diffuser 100. Specifically, the U bolt 554 is removed, the upper end portion 310 of the air supply pipe 300 is removed from the connection portion 516, and the guide bar 490 is removed from the pipe holder 558. And the diffuser 100 is pulled up upwards. The air diffuser 100 is removed from the water treatment tank 610 through the manhole opening 619.

  In this way, by operating the connecting portion 516 and removing the air diffuser 100 from the pipe 510, the air diffuser 100 can be easily removed from the water treatment tank 610. Therefore, maintenance of the air diffuser 100 is easy.

  Further, by fitting the protrusions 290a and 290b attached to the air diffuser 100 into the through holes 420a and 420b of the flat plate 410 fixed in the water treatment tank 610, the air diffuser 100 in the water treatment tank 610 is obtained. Position shift (especially position shift in the horizontal direction) can be suppressed.

  Further, the air diffuser 100 can vibrate due to the air diffused. For example, the vibration direction of the discharge unit 200 includes at least one component in the vertical direction and the horizontal direction. When the air diffuser 100 vibrates, the protrusions 290a and 290b and the second fitting portions 422a and 422b (that is, the flat plate 410) that form the through holes 420a and 420b may be rubbed with each other. In this embodiment, the flat plate 410 is made of FRP (glass fiber reinforced plastic), and the projecting portions 290a and 290b are made of polyvinyl chloride. When FRP and polyvinyl chloride are rubbed together, the wear amount of FRP is less than the wear amount of polyvinyl chloride. Thus, the wear resistance of FRP is higher than the wear resistance of polyvinyl chloride. That is, the wear resistance of the material of the second fitting portions 422a and 422b of the flat plate 410 is higher than the wear resistance of the material of the first fitting portions 290a and 290b of the air diffuser 100. Therefore, the wear of the first fitting portions 290a and 290b of the air diffuser 100 proceeds earlier than the wear of the second fitting portions 422a and 422b of the flat plate 410.

  As described in FIG. 2E, the protruding portions 290a and 290b can be easily detached from the branch pipes 214 and 234 (that is, the discharge portion 200). Therefore, even if the protrusions 290a and 290b wear due to vibration of the air diffuser 100, the protrusions 290a and 290b can be easily removed by removing the air diffuser 100 from the water treatment tank 610. In addition, it can be replaced with a new one. In this way, in the first embodiment, the protrusions 290a and 290b can be easily replaced with new ones without making it difficult to remove the air diffuser 100, so that vibration can be easily dealt with. Note that it is preferable to replace the protrusions 290a and 290b with new ones before the protrusions 290a and 290b are damaged. For example, it is preferable to periodically replace the protrusions 290a and 290b with new ones.

  In the present embodiment, the waste water treatment apparatus 600 includes a guide bar 490 that guides the air diffuser 100 from above to a fixed position. Accordingly, as described with reference to FIGS. 3A to 3C, the user can easily place the air diffuser 100 at a fixed position.

  In the present embodiment, the waste water treatment apparatus 600 includes a first rod 552 that presses the air diffuser 100 downward from above with the air diffuser 100 disposed at a fixed position. Therefore, it is possible to suppress the air diffuser 100 from floating from the fixed position. Moreover, the vibration of the air diffuser 100 due to the air diffuser can be suppressed. Thereby, abrasion with the 1st fitting parts 290a and 290b and the 2nd fitting parts 422a and 422b can be controlled.

B. Examples of wastewater treatment equipment:
FIG. 6 is a block diagram showing a more specific example of the waste water treatment apparatus including the above-described air diffusion system 700 (FIG. 4). The waste water treatment apparatus 900 includes a raw water pump tank 910, a flow rate adjustment tank 920, a metering apparatus 930, an aeration tank 940, a membrane separation tank 950, a sludge storage tank 960, and a disinfection / discharge pump tank 970 in order from the upstream side. ing. FIG. 7 shows a schematic configuration of the waste water treatment apparatus 900 viewed from the side. The wastewater treatment apparatus 900 has three treatment modules 901, 902, and 903 that are separated from each other. The first module 901 accommodates the raw water pump tank 910. The second module 902 contains a flow rate adjustment tank 920 and a sludge storage tank 960. The third module 903 accommodates an aeration tank 940, a membrane separation tank 950, and a disinfection / release pump tank 970. Each outer wall of the second module 902 and the third module 903 has a substantially cylindrical portion extending in the horizontal direction and end walls closing both ends of the substantially cylindrical portion. The interior of the second module 902 is partitioned by a partition wall into a flow rate adjustment tank 920 and a sludge storage tank 960 that are arranged in a horizontal direction. The interior of the third module 903 is partitioned by a partition wall into an aeration tank 940, a membrane separation tank 950, and a discharge pump tank 970 arranged in a horizontal direction. Hereinafter, water flowing through each water treatment tank is referred to as “water to be treated” or simply “water”.

  The waste water flowing into the waste water treatment device 900 is first introduced into the raw water pump tank 910. The raw water pump tank 910 has a raw water pump P1. Even when the flow path of the drainage is lower than the water level of the flow rate adjustment tank 920, the raw water pump P1 can transfer the wastewater in the raw water pump tank 910 to the flow rate adjustment tank 920. When the flow path of the drainage is higher than the water level of the flow rate adjustment tank 920, the raw water pump tank 910 may be omitted.

  The flow rate adjustment tank 920 is a water treatment tank that adjusts the amount of wastewater transferred to a subsequent water treatment tank (here, the aeration tank 940) per unit time. The flow rate adjustment tank 920 is provided with a pump P2 and a metering device 930. The weighing device 930 is disposed at a position higher than the highest water level of the flow rate adjusting tank 920. The pump P <b> 2 transfers the waste water in the flow rate adjustment tank 920 to the weighing device 930. The metering device 930 is a device for adjusting the amount of water flowing out of the metering device 930 to the subsequent water treatment tank per unit time, and includes, for example, a plurality of rectifying plates and weirs. The water whose water amount has been adjusted is transferred from the metering device 930 to the aeration tank 940. Excess water in the drainage supplied to the metering device 930 by the pump P2 returns to the flow rate adjustment tank 920. The flow rate adjustment tank 920 can mitigate the influence of the fluctuation of the inflow water amount per unit time on the water treatment.

  The aeration tank 940 is a water treatment tank that aerobically treats wastewater using activated sludge. In the aeration tank 940, a plurality of (specifically, five) aeration systems 700 are provided. Air from a blower (not shown) is supplied to the activated sludge in the aeration tank 940 by a plurality of aeration systems 700. The activated sludge performs an aerobic treatment of drainage using oxygen contained in bubbles discharged from the air diffuser 100 (FIG. 4) of the air diffuser system 700. The treated water flows from the aeration tank 940 to the membrane separation tank 950 through the advection opening 940o. When a large amount of foam is generated in the aeration tank 940, an antifoaming agent may be introduced into the aeration tank 940.

  When the capacity of the aeration tank 940 is large, since the amount of air supplied to the aeration tank 940 by the blower per unit time is large, vibration of the air diffuser 100 (FIG. 4) is strong. In this case, wear of the protrusions 290a and 290b is likely to proceed. As described above, in the air diffusion system 700, the protrusions 290a and 290b can be easily replaced with new ones without making it difficult to remove the air diffuser 100. Therefore, it is possible to easily cope with the vibration of the air diffuser 100.

  The membrane separation tank 950 is a water treatment tank that aerobically treats wastewater using activated sludge and separates treated water from the activated sludge using a membrane disposed in the activated sludge. The membrane separation tank 950 is provided with three membrane units 952, a circulation pump P3, and a sludge pump P4. Although not shown, the membrane unit 952 has a plurality of plate-like membrane cartridges arranged so as to expand in the vertical direction, and a diffuser tube arranged below the plurality of membrane cartridges. Air is supplied to the air diffuser from a blower (not shown). Activated sludge performs aerobic treatment of wastewater using oxygen contained in bubbles discharged from the air diffuser. The membrane cartridge has a plate-like frame and a porous membrane attached to both sides of the frame. The membrane can pass water without passing through solids such as activated sludge. The water passing through the membrane flows into the disinfection / discharge pump tank 970 through a tube (not shown) fixed to the frame. For separation of activated sludge and water by a membrane, a pump that makes the inside of the membrane cartridge have a negative pressure may be used. Also, the bubbles discharged from the air diffuser move upward along the surface of the membrane. Thereby, since the water containing activated sludge flows along the surface of a film | membrane, obstruction | occlusion of a film | membrane is suppressed.

  The circulation pump P3 returns the water (including activated sludge) in the membrane separation tank 950 to the aeration tank 940. Circulation pump P3 operates intermittently with a timer, for example. By circulating water between the aeration tank 940 and the membrane separation tank 950, the aerobic treatment by the aeration tank 940 and the membrane separation tank 950 can be stabilized. Note that the circulation pump P3 may operate constantly.

  The sludge pump P4 transfers the activated sludge in the membrane separation tank 950 to the sludge storage tank 960. Thereby, it is suppressed that the amount of sludge in the membrane separation tank 950 becomes excessive. The sludge pump P4 is periodically operated by a timer, for example.

  The sludge storage tank 960 is a water treatment tank that stores excess sludge. The sludge stored in the sludge storage tank 960 is periodically discharged from the sludge storage tank 960. For example, the sludge is extracted from the sludge storage tank 960, and the extracted sludge is processed in a sewage treatment facility. The sludge storage tank 960 may be provided with a sludge concentrator (not shown). In this case, the water separated from the sludge by the sludge concentrator is transferred to the flow rate adjustment tank 920.

  The disinfection / discharge pump tank 970 is a water treatment tank that disinfects water from the membrane separation tank 950 using a disinfectant (not shown) and discharges disinfected water. The disinfection / discharge pump tank 970 is provided with a discharge pump P5 and a disinfection device (not shown). The disinfecting apparatus holds the disinfectant and brings the water flowing from the membrane separation tank 950 to the discharge pump tank 970 into contact with the disinfectant. The sterilized water is temporarily stored in the sterilization / discharge pump tank 970. The discharge pump P5 discharges the sterilized water stored in the sterilization / discharge pump tank 970 to the outside of the sterilization / discharge pump tank 970.

  In the above, the waste water treatment apparatus 900 provided with the diffuser system 700 was demonstrated. The air diffusion system 700 can be applied to other various wastewater treatment apparatuses instead of the wastewater treatment apparatus 900 shown in FIGS. For example, the air diffusion system 700 may be applied to a small wastewater treatment apparatus having 5 to 10 treatment target personnel.

C. Another example:
8 (A) to 8 (C) are schematic views of another embodiment of the air diffuser. The air diffuser 100c in FIG. 8A includes a discharge unit 200c. The discharge unit 200c is a linear air diffuser that is closed at both ends and extends in a substantially horizontal direction. A plurality of through holes 202 for discharging gas are provided on the lower surface of the discharge unit 200c. The structure of the part other than the discharge part 200c of the air diffuser 100c is the same as the structure of the corresponding part of the air diffuser 100 of the first embodiment (for example, FIG. 2A). The central part of the discharge part 200c is formed by the same pipe member 222 as the pipe member 222 of FIG. 8A, the guide plate 390 is fixed to the branch pipe 224 of the pipe member 222, and the air supply pipe 300 is connected thereto.

  On the + Y direction side of the central pipe member 222, a T-shaped pipe member 222c that forms a branch pipe 224c protruding downward is provided. A T-shaped pipe member 222d that forms a branch pipe 224d protruding downward is provided on the −Y direction side of the central pipe member 222. Protruding portions 290c and 290d that protrude downward are detachably attached to the branch pipes 224c and 224d. The structures of the branch pipes 224c and 224d and the protrusions 290c and 290d are the same as the structures of the branch pipe 214 and the protrusions 290a in FIG.

  A table 400c is fixed in the water treatment tank. The base 400c has a substantially horizontal flat plate 410c. The flat plate 410c is formed with through holes 420c and 420d into which the protruding portions 290c and 290d are inserted. Hereinafter, portions 422c and 422d of the flat plate 410c forming the through holes 420c and 420d are also referred to as second fitting portions 422c and 422d. The protrusions 290c and 290d that fit into the second fitting portions 422c and 422d are also referred to as first fitting portions 290c and 290d. The configurations of the first fitting portions 290c and 290d and the second fitting portions 422c and 422d are the configurations of the first fitting portions 290a and 290b and the second fitting portions 422a and 422b of the first embodiment, respectively. The same.

  Although not shown, a fixed portion 480 is fixed to the flat plate 410c as in the first embodiment (for example, FIG. 3A), and a guide bar 490 is fixed to the fixed portion 480. The air diffuser 100c and the base 400c can be used instead of the air diffuser 100 and the base 400 of the first embodiment.

  The air diffuser 100e in FIG. 8B includes a discharge unit 200e that is a linear air diffuser extending in a substantially horizontal direction. A difference from the discharge unit 200c in FIG. 8A is that one end of the discharge unit 200e is closed and a T-shaped pipe member 222e is connected to the other end. The pipe member 222e has a branch pipe 224e that protrudes downward, a branch pipe 224f that protrudes upward, and a branch pipe 224g that protrudes in the horizontal direction. A projecting portion 290e is detachably attached to the branch pipe 224e facing downward. A guide plate 390 is fixed to the branch pipe 224f facing upward, and an air supply pipe 300 is connected thereto. A straight pipe 208e is connected to the horizontal branch pipe 224g. A plurality of through holes 202 for discharging gas are provided on the lower surface of the pipe 208e. The structures of the branch pipe 224e and the protrusion 290e are the same as the structures of the branch pipe 214 and the protrusion 290a in FIG.

  A table 400e is fixed in the water treatment tank. The base 400e has a substantially horizontal flat plate 410e. The flat plate 410e is formed with a through hole 420e into which the protruding portion 290e is inserted. Hereinafter, the part 422e which forms the through-hole 420e among the flat plates 410e is also called the 2nd fitting part 422e. The protruding portion 290e that fits in the second fitting portion 422e is also referred to as a first fitting portion 290e. The configurations of the first fitting portion 290e and the second fitting portion 422e are the same as the configurations of the first fitting portions 290a and 290b and the second fitting portions 422a and 422b of the first embodiment, respectively.

  Although not shown, a fixing portion 480 is fixed to the flat plate 410e as in the first embodiment (for example, FIG. 3A), and a guide bar 490 is fixed to the fixing portion 480. The air diffuser 100e and the base 400e can be used instead of the air diffuser 100 and the base 400 of the first embodiment.

  The diffuser 100f shown in FIGS. 8C and 8D has a discharge part 200f. The discharge part 200f is obtained by omitting the through hole 202 from the discharge part 200 (for example, FIG. 2A) of the first embodiment and adding a diffuser 202f instead. The structure of the part other than the discharge part 200f of the air diffuser 100f is the same as the structure of the corresponding part of the air diffuser 100 of the first embodiment. Although not shown, the horizontal positioning of the air diffuser 100f is performed by the first fitting portions 290a and 290b and the second fitting portions 422a and 422b, as in the first embodiment (for example, FIG. 4). Done. The air diffuser 100f can be used instead of the air diffuser 100 of the first embodiment.

  In the embodiment of FIG. 8C, the diffuser 202f is fixed to the pipe member PL of the discharge part 200f with a U bolt 204 surrounding the pipe member PL. FIG. 8D is a cross-sectional view of the pipe member PL and the diffuser 202f. A through hole 200fo is formed in the lower surface of the pipe member PL. The upper end portion of the diffuser 202f is inserted into the through hole 200fo. In this state, the diffuser 202f is fixed to the pipe member PL with a U bolt 204.

  The diffuser 202f has a plurality of slits 202fs arranged from the upper end to the lower end. The gas supplied from the pipe member PL is discharged from the diffuser 202f through the gaps of the plurality of slits 202fs.

  FIGS. 9A and 9B are schematic views of another embodiment of the air diffuser. FIG. 9A shows the air diffuser 100h and the base 400h viewed in the horizontal direction. FIG. 9B is a perspective view showing a part of the air diffuser 100h and the base 400h. The air diffuser 100h is obtained by omitting the protrusion 290e from the air diffuser 100e of FIG. 8B and adding a fitting plate 290h instead.

  The fitting plate 290h is detachably fixed to the pipe member 222e (here, the branch pipe 224e facing downward). In this embodiment, the fitting plate 290h is fixed to the branch pipe 224e with a U bolt 299 surrounding the branch pipe 224e. The fitting plate 290h is a plate that expands in a horizontal direction. A through hole 296h is formed in the fitting plate 290h.

  A base 400h is fixed to the water treatment tank. The base 400h is obtained by omitting the through hole 420e from the base 400e of FIG. 8B and adding a protruding portion 420h instead. The protrusion 420h is fixed on a substantially horizontal flat plate 410h of the base 400h, and protrudes from the flat plate 410h in the + Z direction.

  As illustrated, the air diffuser 100h is installed at a position where the lower end of the pipe member 222e (here, the lower surface of the branch pipe 224e) contacts the flat plate 410h. The protrusion 420h is inserted into the through hole 296h of the fitting plate 290h. Thereby, horizontal positioning of the diffuser 100h in a water treatment tank is performed. Hereinafter, a portion 298h forming the through hole 296h in the fitting plate 290h is also referred to as a first fitting portion 298h. The protrusion 420h that fits in the first fitting portion 298h is also referred to as a second fitting portion 420h.

  Although not shown, a fixed portion 480 is fixed to the flat plate 410h as in the first embodiment (for example, FIG. 3A), and a guide bar 490 is fixed to the fixed portion 480. The air diffuser 100h and the base 400h can be used instead of the air diffuser 100 and the base 400 of the first embodiment.

  8A to 8D, FIG. 9A, and FIG. 9B described above, as in the first embodiment, the air diffusers 100c, 100e, and 100f. , 100h can be removed from the pipe 510 (FIG. 4) to easily remove the air diffusers 100c, 100e, 100f, and 100h from the water treatment tank. Therefore, maintenance of the air diffuser is easy.

  Moreover, in each Example, 1st fitting part 290a-290e, 298h (fitting board 290h) is formed with a polyvinyl chloride, and 2nd fitting part 422a-422e, 420h (flat plate 410, 410c, 410e, 410h) is formed. ) Is formed of FRP. Therefore, when the air diffusers 100c, 100e, 100f, and 100h vibrate due to air diffusion, the wear of the first fitting portions 290a to 290e and 298h is more than the wear of the second fitting portions 422a to 422e and 420h. , Go ahead. The first fitting portions 290a to 290e in the embodiment of FIGS. 8A to 8D can be easily replaced with new ones similarly to the first fitting portion 290a of the embodiment in FIG. It is. Further, the fitting plate 290h forming the first fitting portion 298h in FIG. 9B can be easily replaced with a new one by removing the U bolt 299. As described above, in each of the embodiments, the first fitting portions 290a to 290e and the fitting plate 290h can be easily replaced with new ones without making it difficult to remove the diffuser, so that vibration can be easily dealt with.

  Further, in each embodiment, the fixing position of the guide bar 490 on the flat plates 410, 410c, 410e, and 410h is the first fitting portion 290a when the guide bar 490 is inserted into the through hole 392 of the guide plate 390. ˜290e and 298h are determined in advance so as to be located near the second fitting portions 422a to 422e and 420h. Therefore, the user can easily fit the first fitting portions 290a to 290e and 298h into the second fitting portions 422a to 422e and 420h. In addition, when the first fitting portions 290a to 290e and 298h are fitted to the second fitting portions 422a to 422e and 420h, the air diffuser is misaligned in the water treatment tank (particularly, the position in the horizontal direction). (Displacement) can be suppressed.

  8A to 8D, 9A, and 9B, in the same manner as in the first embodiment, the user uses the guide bar 490 to diffuse the diffuser. Can be easily arranged at a predetermined fixed position. Moreover, the support part 550 demonstrated in FIG. 4, FIG. 5 is applicable to each Example of FIG. 8 (A)-FIG. 8 (D), FIG. 9 (A), and FIG. 9 (B). Therefore, it is possible to suppress the air diffuser from floating from the fixed position.

D. Variations:
(1) As a structure of the 1st fitting part of an air diffuser, and the 2nd fitting part fixed in the water treatment tank, it replaces with the structure of said each Example, and an air diffuser is water. Arbitrary configurations that fit each other when arranged at a predetermined fixed position in the treatment tank can be adopted. For example, one of the first fitting portion and the second fitting portion is a protruding portion, and the other of the first fitting portion and the second fitting portion is a bottomed concave portion into which the protruding portion is inserted. There may be. Moreover, a hollow cylinder may be sufficient as the fitting part in which a protrusion part is inserted. Thus, one of the first fitting portion and the second fitting portion includes a protruding portion, and the other of the first fitting portion and the second fitting portion is a through hole into which the protruding portion is inserted or A bottomed recess may be formed.

  Here, it is preferable that the fitting portion into which the protruding portion is inserted is formed in a plane formed by the plane forming portion. For example, in the embodiment of FIG. 3A, the flat plate 410 corresponds to the plane forming portion, and in the embodiment of FIG. 9B, the fitting plate 290h corresponds to the plane forming portion. If such a structure is employ | adopted, the user can insert a protrusion part easily in a fitting part by finely adjusting the position of an air diffuser along a plane in the state which the protrusion part contacted the plane. When the fitting part into which the protrusion part is inserted is provided in the water treatment tank, it is preferable that the plane forming part having the fitting part is fixed in the water treatment tank. When the fitting part into which the protrusion part is inserted is provided in the diffuser, it is preferable that the plane forming part having the fitting part is detachably attached to the diffuser.

  In general, the removal and re-installation of the air diffuser is performed by moving the air diffuser in a substantially vertical direction. Therefore, the first fitting portion and the second fitting portion are configured so that the first fitting portion and the second fitting portion are fitted to each other by moving the air diffuser vertically downward. It is preferable. For example, when the fitting portion is a protruding portion, the protruding portion preferably protrudes parallel to the vertical direction. Moreover, when a fitting part forms the through-hole or bottomed recessed part in which a protrusion part is inserted, it is preferable that the through-hole or bottomed recessed part is extended in parallel with the perpendicular direction. According to this configuration, the user moves the air diffuser in a substantially vertical direction to fit the first fitting portion into the second fitting portion, and the first fitting portion from the second fitting portion. It can be easily removed. Moreover, the position shift of the horizontal direction of the diffuser in a water treatment tank can be suppressed.

  In order to easily remove the air diffuser, it is preferable that the first fitting portion and the second fitting portion are configured to fit without being locked to each other. According to this configuration, the user can easily remove the first fitting portion from the second fitting portion by pulling the air diffuser upward.

  Moreover, as a total number of the 1st fitting parts provided in an air diffuser, 1 or more arbitrary numbers are employable. The total number of second fitting parts fixed in the water treatment tank is preferably the same as the total number of first fitting parts. In addition, when the total number of 1st fitting parts is 3 or more, it may be difficult to fit all the 1st fitting parts to the corresponding 2nd fitting part. Therefore, the total number of the first fitting portions is preferably one or two. In order to suppress misalignment of the diffuser, the total number of first fitting portions is preferably two.

  In any case, the second fitting portion is not limited to the outer wall of the waste water treatment apparatus, and may be fixed to a wall that defines the outer shape of the water treatment tank such as a partition plate, or in the water treatment tank such as a gantry. It may be fixed to a fixed member. In any case, since the second fitting portion cannot move in the water treatment tank, it can be said that the second fitting portion is fixed in the water treatment tank.

(2) As a configuration for detachably attaching the first fitting portion to the diffuser, a configuration using a screw thread as shown in FIG. 2 (E) and a U bolt 299 as shown in FIG. 9 (B). Not only the structure to be used but arbitrary structures are employable. For example, in the embodiment shown in FIG. 2E, the female screw 214s and the male screw 292s are omitted, and instead, a nut is fastened to a bolt that penetrates the branch pipe 214 and the pipe 292, whereby the protrusion 290a is connected to the branch pipe 214. It may be attached to. Further, the protrusion 290a may be attached to the branch pipe 214 by providing a flange at the end of the branch pipe 214 and tightening a nut to a bolt passing through the flange of the branch pipe 214 and the flange 294 of the protrusion 290a.

(3) As the material of the first fitting portion of the air diffuser, various other materials can be adopted instead of polyvinyl chloride. For example, a resin such as polypropylene, polyethylene, epoxy resin, dicyclopentadiene may be employed. Moreover, it can replace with FRP as a material of the 2nd fitting part fixed to the water treatment tank, and can employ | adopt other various materials. For example, a metal such as stainless steel may be employed. In general, the material of the first fitting part and the second fitting part such that the wear resistance of the material of the second fitting part is higher than the wear resistance of the material of the first fitting part. Any combination with the material can be employed.

  As a method of comparing the wear resistance between the material of the first fitting portion and the material of the second fitting portion, the following method can be adopted. A cylindrical first block is formed of the same material as that of the first fitting portion. A second block having the same shape as that of the first block is formed of the same material as that of the second fitting portion. One circular end surface (referred to as a second surface) of the second block is overlaid on one circular end surface (referred to as a first surface) of the first block. Here, the center of the second surface is brought into contact with the center of the first surface. In this state, with respect to the second block, centering on an axis passing through the center of the first surface and the second surface and perpendicular to the first surface and the second surface (that is, the central axis of the cylindrical block), The first block is rotated relatively. Thus, the first surface of the first block and the second surface of the second block are rubbed together under the same conditions. Then, at least one of the first surface and the second surface is worn. Here, the volume of the worn part of the first block is compared with the volume of the worn part of the second block. Of the two blocks, the material of the block whose worn portion has a small volume has a relatively high wear resistance.

  In general, it is preferable that the durability of the second fitting portion with respect to wear is higher than the durability of the first fitting portion with respect to wear. Here, the durability against wear indicates the difficulty of causing damage due to wear (the higher the durability against wear, the less likely damage is caused by wear). Even when at least one of the first fitting portion and the second fitting portion is worn, the fitting state in which the first fitting portion and the second fitting portion are fitted to each other is maintained. If possible, it can be said that the first fitting portion and the second fitting portion are not damaged. When the first fitting portion and the second fitting portion cannot maintain the fitted state due to wear of the first fitting portion, it can be said that the first fitting portion is damaged. If the fitting state cannot be maintained due to wear of the second fitting portion, it can be said that the second fitting portion is damaged.

  When the durability of the second fitting portion with respect to wear is higher than the durability of the first fitting portion with respect to wear, damage to the second fitting portion is suppressed. Therefore, it is possible to reduce the possibility of requiring a heavy work such as replacement or repair of the second fitting portion. Further, as described above, it is easy to replace the damaged first fitting portion with a new first fitting portion. Therefore, when the first fitting portion is damaged, the first fitting portion and the second fitting portion can maintain the fitted state again by replacing the first fitting portion with a new one.

  Various configurations can be adopted as the configuration in which the durability against wear of the second fitting portion is higher than the durability against wear of the first fitting portion. For example, as in the above embodiment, the first fitting portion and the second fitting portion are formed of different materials, and the material of the first fitting portion is used as the material of the second fitting portion. You may employ | adopt the material which has abrasion resistance higher than abrasion property.

  Moreover, the 1st fitting part and the 2nd fitting part may be formed with the same material. In this case, by using the difference between the shape of the first fitting portion and the shape of the second fitting portion, the durability against the wear of the second fitting portion is more than the durability against the wear of the first fitting portion. Can also be high. For example, in the embodiments of FIGS. 9A and 9B, the first fitting portion 298h is damaged due to wear of the fitting plate 290h (specifically, the first fitting portion 298h). (For example, a part of the loop-shaped first fitting portion 298h forming the through hole 296h is missing). Further, the second fitting portion 420h may be damaged due to wear of the protruding portion 420h (that is, the second fitting portion 420h) (for example, the second fitting portion 420h is separated from the flat plate 410h). Here, the wear of the second fitting portion 420h is achieved by increasing the horizontal outer diameter of the second fitting portion 420h (projecting portion 420h) and reducing the horizontal thickness of the first fitting portion 298h. The durability against the wear can be made higher than the durability against wear of the first fitting portion 298h.

  The maximum amount of wear possible when the fitting portion is worn while the fitting portion is not damaged is called the maximum allowable wear amount. The volume of a portion of the fitting portion that can be worn without damage (also referred to as “wearable portion”) corresponds to the maximum allowable wear amount. Generally, the shape of the first fitting portion and the shape of the second fitting portion are such that the wearable portion of the second fitting portion is larger than the wearable portion of the first fitting portion, that is, second It is preferable to adopt a shape in which the maximum allowable wear amount of the fitting portion is larger than the maximum allowable wear amount of the first fitting portion. By adopting such a shape, the durability of the second fitting portion with respect to wear can be easily made higher than the durability of the first fitting portion with respect to wear. In addition, when the wear resistance of the material of the second fitting portion is higher than the wear resistance of the material of the first fitting portion, the wearable portion of the second fitting portion is the wear of the first fitting portion. It may be smaller than the possible part.

(4) As a structure of the discharge part which discharges gas among diffusers, the diffuser (FIG. 2D) (for example, the discharge part 200 of FIG.2 (D)) and the diffuser which has a some slit (FIG. 8 (D)), any configuration capable of discharging a large number of bubbles can be employed. For example, a membrane diffuser or a porous body may be used.

  Moreover, as a structure of a diffuser, various structures including a discharge part and an air supply pipe connected to the discharge part and supplying gas to the discharge part can be adopted. The air supply pipe is in the vicinity of the manhole opening from the air diffusion pipe (for example, the range where the human hand can reach from the outside of the manhole opening. More specifically, for example, the manhole opening It is preferable that the distance from the edge extends to within 1 m or less. According to this configuration, the user can easily put in and out the air diffuser through the manhole opening by having the air supply pipe.

(5) As a configuration of the guide for guiding the diffuser to a fixed position in the water treatment tank, instead of the configuration of the guide bar 490 (for example, FIG. 3B) of the above embodiment, the diffuser is moved upward. It is possible to adopt an arbitrary configuration capable of guiding from a fixed position to a fixed position. For example, you may employ | adopt the groove | channel which guides an air diffuser from the upper direction to a fixed position. The air diffuser is provided with a claw that can move along the groove without leaving the groove.

  In any case, the installation and removal of the diffuser is performed through the manhole opening. Therefore, it is preferable that the guide extends from the vicinity of the manhole opening to the vicinity of the fixed position in the water treatment apparatus. And it is preferable that the connection part which connects an air diffuser and a guide is provided in an air diffuser. As the configuration of the connecting portion, in place of the configuration of the hole forming portion (for example, the guide plate 390 in FIG. 3B) that forms a through-hole through which the guide passes or the above-described claw configuration, the movable portion can be moved along the guide. Various configurations can be employed. Here, the guide and the connecting portion are configured so that the first fitting portion of the air diffuser can be fitted to the second fitting portion in the water treatment tank without removing the connecting portion from the guide. It is preferable. Moreover, the position shift of the horizontal direction of an air diffuser is suppressed by the 1st fitting part and the 2nd fitting part. Therefore, as the play of the horizontal position of the connecting portion with respect to the guide, a value larger than the play of the horizontal position of the first fitting portion with respect to the second fitting portion can be adopted.

  In addition, a connection part may be abbreviate | omitted. For example, an inclined plate that is inclined obliquely with respect to the vertical direction may be employed as the guide. Then, the air diffuser may slide on the inclined plate and move from above to the fixed position. Further, the guide may be omitted.

(6) As a structure of the holding | suppressing part which hold | suppresses a diffuser from upper direction toward the downward direction, it replaces with the structure of the 1st stick | rod 552 (for example, FIG. 4) of the said Example, and an diffuser is in a water treatment tank. Any configuration that can hold down the air diffuser from the upper side to the lower side in a state of being arranged at the fixed position can be adopted. For example, the first rod 552 may be detachably attached to a wall (for example, the outer wall 690 (FIG. 4)) that forms the water treatment tank (for example, fixing with a bolt and a nut). Moreover, a pipe holder may be fixed near the manhole opening in the water treatment tank, and the pipe holder may hold an air supply pipe (for example, the air supply pipe 300 in FIG. 4). In general, it is preferable that a member fixed to a wall (for example, the outer wall 690 in FIG. 4 or a partition wall (not shown)) that forms the water treatment tank presses the air diffuser downward from above. Such a holding | suppressing part can suppress the position shift of the vertical direction of the aeration apparatus in a water treatment tank.

  Moreover, it is preferable that the holding | suppressing part is arrange | positioned in the vicinity of the manhole opening. According to this configuration, the user can easily connect the holding unit and the air diffuser, and can easily remove the air diffuser from the holding unit. Note that the pressing portion may be omitted.

(7) The configuration of the connection portion 516 of the above-described embodiment (specifically, a union) is used as the configuration of the connection portion that detachably connects the gas supply pipe to the gas supply device and the air diffusion device. Instead, any other configuration in which the pipe and the air diffuser are detachably connected can be employed. For example, a flange may be provided on the piping, a flange may be provided on the air supply pipe of the air diffuser, and these flanges may be fixed with bolts and nuts. In any case, it is preferable that the connecting portion is disposed in the vicinity of the manhole opening. According to this configuration, the user can easily connect and remove the pipe and the air diffuser.

(8) As piping for supplying gas to the diffuser, any piping that is fixed in the water treatment tank and to which a blower is connected can be employed. For example, the valve 514 may be omitted from the pipe 510 in the embodiment of FIG.

(9) As a structure of the support part that supports the air diffuser from below to above, any structure that can support the air diffuser is adopted instead of the structure of the flat plate (for example, the flat plate 410 in FIG. 4). Is possible. In general, any configuration that supports at least a part of the air diffuser from below to above can be employed. Such a support is preferably fixed in the water treatment tank. The support part may be fixed to the side wall of the water treatment tank instead of the bottom of the water treatment tank. Like each said Example, the 2nd fitting part may be provided in the support part. Instead of this, the second fitting portion may be fixed in the water treatment tank separately from the support portion.

(10) As a configuration of the waste water treatment apparatus, various other configurations can be adopted instead of the configurations of the above-described embodiments. For example, the processing flow of the waste water treatment apparatus may be different from the processing flows of FIGS. For example, a wastewater treatment apparatus including a contaminant removal tank, an anaerobic filter bed tank, an aerobic filter bed tank, a treatment water tank, and a disinfection tank arranged in order from the upstream side to the downstream side may be employed. Here, an air diffuser having a fitting portion can be adopted as the air diffuser of the aerobic filter bed tank. In any case, instead of the aerobic treatment tank, another water treatment tank may be adopted as the water treatment tank provided with the air diffuser having the fitting portion. For example, an aeration device may be provided in the sludge storage tank in order to agitate the sludge. Moreover, the number of the water treatment tanks provided in the waste water treatment apparatus can employ any number of 1 or more.

  As mentioned above, although this invention was demonstrated based on the Example and the modification, Embodiment mentioned above is for making an understanding of this invention easy, and does not limit this invention. The present invention can be changed and improved without departing from the spirit and scope of the claims, and equivalents thereof are included in the present invention.

100, 100c, 100e, 100f, 100h ... Air diffuser, 200, 200c, 200e, 200f ... Discharge part, 200fo ... Through hole, 202 ... Through hole, 202f ... Diffuser, 202fs ... slit, 208e ... pipe, 210 ... outer pipe part, 212 ... pipe member, 214 ... branch pipe, 220 ... inner pipe part, 222, 222c, 222d, 222e ... Pipe member, 224, 224c, 224d, 224e, 224f, 224g ... branch pipe, 230 ... outer pipe section, 232 ... pipe member, 234 ... branch pipe, 240, 250 ... pipe Part, 280 ... cap, 290a, 290b, 290c, 290d, 290e ... first fitting part (protrusion part), 290h ... fitting plate, 292 ... pipe, 294 ... flange, 296h ... through hole, 298h ... first fitting part, 30 ... Air supply pipe, 302 ... Vertical pipe, 304,306 ... Pipe member, 310 ... Upper end part, 390 ... Guide plate, 392 ... Through hole, 400, 400c, 400e, 400h ... stand, 410, 410c, 410e, 410h ... flat plate, 420a, 420b, 420c, 420d, 420e ... through hole, 420h ... second fitting part (protruding part), 420ao ... 422a, 422b, 422c, 422d, 422e ... second fitting part, 480 ... fixing part, 490 ... guide rod, 510 ... piping, 512 ... connecting pipe, 514 .. Valve, 516 ... Connection part, 550 ... Support part, 551a, 551b ... Fixing part, 552 ... First rod, 556 ... Second rod, 558 ... Pipe holder, 600 ... Wastewater treatment equipment, 610 ... Water treatment tank, 619 ... Manhole opening, 690 ... Outer wall, 700 ... Aeration system, 900 ... Wastewater 901 ... first module, 902 ... second module, 903 ... third module, 910 ... raw water pump tank, 920 ... flow rate adjusting tank, 930 ... metering device, 940 ... Aeration tank, 940o ... Advection opening, 950 ... Membrane separation tank, 952 ... Membrane unit, 960 ... Sludge storage tank, 970 ... Discharge pump tank, D1 ... Inner diameter , D2 ... outer diameter, L1 ... distance, g1 ... gap, P1 ... raw water pump, P2 ... pump, P3 ... circulation pump, P4 ... sludge pump, P5 ... Discharge pump, PL ... pipe member, CL ... center shaft, PT ... pipe member

Claims (4)

Wastewater treatment equipment,
One or more water treatment tanks;
An air diffuser disposed in a specific water treatment tank among the one or more water treatment tanks;
Piping for supplying gas to the air diffuser;
A connecting part for detachably connecting the pipe and the air diffuser;
A first fitting portion detachably attached to the air diffuser;
It is fixed in the specific water treatment tank, and is configured to fit into the first fitting portion when the air diffuser is disposed at a predetermined fixed position in the specific water treatment tank. A second fitting portion;
With
The durability against wear of the second fitting portion is higher than the durability against wear of the first fitting portion.
Wastewater treatment equipment. A wastewater treatment apparatus according to claim 1,
The first fitting portion and the second fitting portion are formed of different materials,
The wear resistance of the material of the second fitting portion is higher than the wear resistance of the material of the first fitting portion,
Wastewater treatment equipment. The wastewater treatment apparatus according to claim 1 or 2,
A guide for guiding the air diffuser from above to the fixed position;
Wastewater treatment equipment. A wastewater treatment apparatus according to any one of claims 1 to 3,
In the state where the air diffuser is disposed at the fixed position, the air diffuser includes a pressing portion that presses the air diffuser downward from above.
Wastewater treatment equipment.

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