JP2022178310A - Wastewater treatment device - Google Patents

Abstract

To measure the amount per unit time of water being transferred in a transfer channel, while preventing the structure of a wastewater treatment device from becoming complicated.SOLUTION: The wastewater treatment device comprises a plurality of water treatment tanks including a first water treatment tank and a second water treatment tank, a pump sucking water from the second water treatment tank, and a transfer channel connected to the pump to transfer water sucked by the pump to the first water treatment tank. The transfer channel forms a first opening and a second opening disposed closer to the pump relative to the first opening and comprises a valve that opens/closes the second opening. The first opening is disposed on a position allowing water flowing out of the first opening to flow into the first water treatment tank, and the second opening is disposed on a position allowing water flowing out of the second opening to flow into the first water treatment tank.SELECTED DRAWING: Figure 2

Description

The present specification relates to a wastewater treatment apparatus for treating wastewater.

Conventionally, wastewater treatment has been performed using microorganisms. As a wastewater treatment apparatus (also called a septic tank) that performs such wastewater treatment, a plurality of water treatment tanks (for example, a plurality of water treatment tanks including a contaminant removal tank, an anaerobic filter bed tank, and a carrier fluidization tank ) is used. Also, in order to utilize a plurality of water treatment tanks, there is provided a wastewater treatment apparatus comprising a pump for sucking water from the water treatment tank and a transfer channel for transferring the water sucked by the pump to another water treatment tank. ,in use.

JP-A-2002-186980

By the way, for appropriate water treatment, it is preferable that the amount of water transferred by the transfer channel per unit time is adjusted within an appropriate range. When the amount of water in the appropriate range is small, the operator can actually measure the amount of water per unit time by receiving the water flowing out of the transfer channel with a container such as a beaker. When the amount of water in the appropriate range is large, the wastewater treatment equipment is provided with a metering device for measuring the amount of water per unit time. Various drawbacks can arise when metering devices are provided. For example, since the metering device occupies a large space in the wastewater treatment apparatus, the degree of freedom in designing the wastewater treatment apparatus may be limited. In addition, the burden of designing the metering device in accordance with the appropriate range of water volume was large.

This specification discloses a technique for measuring the amount of water transferred by a transfer channel per unit time while suppressing complication of the configuration of the waste water treatment apparatus.

The technology disclosed in this specification can be implemented as the following application examples.

[Application example 1]
A wastewater treatment apparatus comprising a plurality of water treatment tanks including a first water treatment tank and a second water treatment tank;
a pump for sucking water from the second water treatment tank;
a transfer channel connected to the pump for transferring water sucked by the pump to the first water treatment tank;
with
The transfer flow path forms a first opening and a second opening arranged closer to the pump than the first opening, and includes a valve that opens and closes the second opening,
The first opening is arranged at a position where the water flowing out from the first opening flows into the first water treatment tank,
The second opening is arranged at a position that allows the water flowing out from the second opening to flow into the first water treatment tank,
Wastewater treatment equipment.

According to this configuration, by opening the valve, the water flowing into the first water treatment tank from the transfer channel can be dispersed to the first opening and the second opening, so that the water can be discharged from one opening. The amount of water flowing out from each opening per unit time can be reduced compared to the case of flowing out. Therefore, the operator can easily measure the amount of water flowing into the first water treatment tank from the transfer channel per unit time. In this way, it is possible to measure the amount of water transferred by the transfer channel per unit time while suppressing the complication of the configuration of the waste water treatment apparatus.

[Application example 2]
The wastewater treatment apparatus according to Application Example 1,
The transfer channel includes a tubular portion that is a tubular portion,
The pipe portion forms the second opening provided on the side surface of the pipe portion,
The valve includes a wall portion attached to the outer peripheral side of the pipe portion,
The wall portion is movable between one or more open positions that do not cover at least a portion of the second opening and one or more closed positions that cover the second opening. attached to the outer periphery of the
Wastewater treatment equipment.

According to this configuration, the second opening can be easily opened and closed by moving the valve wall portion between the open position and the closed position.

[Application Example 3]
The wastewater treatment device according to Application Example 2,
The wall portion of the valve is attached to the outer peripheral side of the pipe portion so as to be rotatable in the circumferential direction with respect to the pipe portion,
The wall portion includes a partial peripheral wall portion that covers a part of the outer peripheral surface of the pipe portion in the circumferential direction,
The one or more closed positions include a position of rotational movement of the wall portion in the circumferential direction and a position where the partial peripheral wall portion covers the second opening;
The one or more open positions are positions of rotational movement of the wall portion in the circumferential direction, and include positions where the partial peripheral wall portion does not cover at least a portion of the second opening.
Wastewater treatment equipment.

According to this configuration, the second opening can be easily opened and closed by rotating the wall portion of the valve in the circumferential direction with respect to the pipe portion.

[Application example 4]
The wastewater treatment device according to Application Example 3,
The valve is a projecting portion fixed to the wall portion and projecting toward the outer peripheral side, and is provided at N different positions (N is an integer of 2 or more) in the circumferential direction. having a protrusion,
Wastewater treatment equipment.

According to this configuration, an operator can easily rotate the wall of the valve by bringing a tool such as a cleaning brush into contact with the protrusion.

[Application example 5]
The wastewater treatment apparatus according to any one of Application Examples 2 to 4,
the wall portion of the valve is attached to the outer peripheral side of the pipe portion so as to be movable relative to the pipe portion in an axial direction, which is the direction in which the pipe portion extends;
wherein the one or more closed positions include positions of axial movement of the wall, wherein the wall covers the second opening;
The one or more open positions include positions of axial movement of the wall, wherein the wall does not cover at least a portion of the second opening.
Wastewater treatment equipment.

According to this configuration, the second opening can be easily opened and closed by axially moving the wall portion of the valve with respect to the pipe portion.

[Application example 6]
The wastewater treatment apparatus according to Application Example 5,
wherein the valve has a rod attached to the wall for manipulation by an operator to move the wall in the axial direction;
Wastewater treatment equipment.

According to this configuration, the worker can easily move the wall portion in the axial direction by operating the rod.

[Application example 7]
The wastewater treatment apparatus according to any one of Application Examples 1 to 6,
The first opening is provided at an end of the transfer channel,
Wastewater treatment equipment.

According to this configuration, complication of the configuration of the transfer channel can be suppressed.

[Application example 8]
The wastewater treatment apparatus according to any one of Application Examples 1 to 7,
The first water treatment tank comprises a baffle plate forming a receiving portion for receiving water flowing into the first water treatment tank,
The first opening is arranged at a position to allow the water flowing out from the first opening to flow into the receiving portion of the first water treatment tank,
The second opening is arranged at a position that allows the water flowing out from the second opening to flow into a portion of the first water treatment tank different from the receiving portion,
Wastewater treatment equipment.

According to this configuration, it is possible to suppress an increase in the size of the receiving portion and, by extension, the baffle plate.

It should be noted that the technology disclosed in this specification can be implemented in various forms, for example, in the form of a wastewater treatment device, a wastewater treatment method, and the like.

1 is a schematic diagram showing a waste water treatment apparatus as one embodiment; FIG. (A) and (B) are explanatory diagrams showing the configuration of the circulation device 1000. FIG. (A)-(E) are explanatory diagrams of the hole-forming tube portion 300. FIG. (A)-(D) are explanatory diagrams of the valve 400. FIG. (A)-(F) are explanatory diagrams of the rotational positions of the valve 400. FIG. (A) and (B) are explanatory diagrams of another rotational position RP3 of the valve 400. FIG. (A)-(E) are explanatory diagrams showing a hole-forming pipe portion 300x and a valve 400x of the second embodiment. (A) and (B) are explanatory diagrams of movement positions of the valve 400x.

A. First example:
A1. Configuration of the wastewater treatment device 100:
FIG. 1 is a schematic diagram showing a waste water treatment apparatus as one embodiment. The drawing shows the waste water treatment apparatus 100 viewed from the side. The wastewater treatment apparatus 100 of the present embodiment purifies wastewater W (also called raw water) from general households (such a device is also called a "septic tank"). The wastewater treatment system 100 includes an outer wall 190 that houses a plurality of water treatment tanks 110-180. In this embodiment, the outer wall 190 forms a substantially cylindrical body 190b extending in the horizontal first direction X (such a body 190b is also called a tubular body).

In this embodiment, the internal space of the body 190b includes, in order from the upstream side (left side in FIG. 1), the pre-carrier fluidization tank 120, the contaminant removal tank 110, the first chamber 130 of the anaerobic filter bed tank, and the anaerobic filter bed. A tank second chamber 140, a carrier fluidizing tank 150, a circulation filtration tank 160, a disinfection tank 170, and a discharge pump tank 180 are provided. A partition wall separates two adjacent tanks. The waste water W that has flowed into the waste water treatment apparatus 100 is treated in this order by the water treatment tanks 110, 120, 130, 140, 150, 160, 170, and 180.

The waste water W that has flowed into the waste water treatment device 100 flows into the contaminant removal tank 110 . The contaminant removal tank 110 is a water treatment tank for sedimentation separation of solid matter contained in the waste water W. Baffle plates 112 and 114 and a first air lift pump 201 are provided in the contaminant removal tank 110 . The first baffle plate 112 forms a receiving portion 113 that is an area surrounded by the first baffle plate 112 . The waste water W is guided to the receiving portion 113 by piping (not shown). The contaminant removal tank 110 sediments and separates solids in the waste water W and stores them as deposited sludge and scum. The separated water passes through the area surrounded by the second baffle plate 114 and flows into the anaerobic filter bed tank first chamber 130 through the partition wall opening 131 .

A first air lift pump 201 provided in the contaminant removal tank 110 uses air from a blower (not shown) to transfer the intermediate water in the contaminant removal tank 110 to the pre-carrier fluidization tank 120 .

The upstream carrier fluidization tank 120 is a water treatment tank that reduces the volume of sludge by aerobic treatment. An air diffuser 122 is provided at the bottom of the pre-carrier fluidization tank 120 . A plurality of carriers 123 are accommodated in the pre-carrier fluidization tank 120 . The air diffuser 122 agitates the water in the pre-carrier fluidizing tank 120 by blowing air from a blower (not shown) to supply oxygen to the water in the pre-carrier fluidizing tank 120 . Aerobic microorganisms adhering to the carrier 123 aerobically treat the water in the pre-carrier fluidizing tank 120 . This decomposes the organic matter. The water treated by the pre-carrier fluidization tank 120 flows into the contaminant removal tank 110 through the opening 111 of the partition wall 115 .

The anaerobic filter tank first chamber 130 and the anaerobic filter tank second chamber 140 are water treatment tanks that perform anaerobic treatment with anaerobic microorganisms. A baffle plate 132 and an anaerobic filter bed 134 are provided in the anaerobic filter bed tank first chamber 130 . The water that has flowed into the anaerobic filter bed tank first chamber 130 is guided below the anaerobic filter bed 134 by the baffle plate 132 . Water below the anaerobic filter bed 134 rises through the anaerobic filter bed 134 and moves above the anaerobic filter bed 134 . The anaerobic microorganisms adhering to the anaerobic filter bed 134 anaerobically treat the water in the anaerobic filter bed tank first chamber 130 . This decomposes the organic matter. Also, nitrate nitrogen and nitrite nitrogen are reduced to nitrogen gas. Anaerobic filter bed 134 may also trap solids in the water. Then, the anaerobic filter bed tank first chamber 130 can sediment and separate the solid matter. The water treated by the anaerobic filter bed first chamber 130 flows into the anaerobic filter bed second chamber 140 through the opening 141 of the partition wall.

An anaerobic filter bed 144 and a second air lift pump 202 are provided in the anaerobic filter bed tank second chamber 140 . The water that has flowed into the anaerobic filter bed tank second chamber 140 descends through the anaerobic filter bed 144 from above the anaerobic filter bed 144 and moves below the anaerobic filter bed 144 . The anaerobic microorganisms adhering to the anaerobic filter bed 144 anaerobically treat the water in the anaerobic filter bed tank first chamber 130 . Also, the anaerobic filter bed 144 may trap solids in the water. Then, the anaerobic filter bed tank second chamber 140 can sediment and separate the solid matter. A second airlift pump 202 uses air from a blower (not shown) to move the water below the anaerobic filter bed 144 to the carrier fluidization tank 150 . The second air lift pump 202 can reduce changes in the transfer amount per unit time to the carrier fluidizing tank 150 . A metering device may be provided to further suppress changes in the amount transferred to the carrier fluidizing tank 150 per unit time. The water level WL1 of the water treatment tanks 110, 130, 140 changes according to the change in the amount of waste water W flowing into the waste water treatment apparatus 100 per unit time. In this embodiment, the water level WL1 is variable between a predetermined low water level LWL and high water level HWL.

The baffle plates 112 and 114 of the contaminant removal tank 110 and the baffle plate 132 of the anaerobic filter bed tank first chamber 130 extend from a position lower than the water level WL1 to a position higher than the water level WL1. In this embodiment, the baffle plates 112, 114, 132 extend from below the low water level LWL to above the high water level HWL.

The carrier fluidization tank 150 is a water treatment tank that performs aerobic treatment with aerobic microorganisms. An air diffuser 152 is provided at the bottom of the carrier fluidizing tank 150 . A plurality of carriers 153 are accommodated in the carrier fluidizing tank 150 . The air diffuser 152 agitates the water in the carrier fluidizing tank 150 by blowing air from a blower (not shown) and supplies oxygen to the water in the carrier fluidizing tank 150 . Aerobic microorganisms adhering to the carrier 153 aerobically treat the water in the carrier fluidizing tank 150 . This decomposes the organic matter. In addition, nitrifying bacteria contained in aerobic microorganisms oxidize ammonium ions contained in water to produce nitrite ions and nitrate ions (nitrification). The water treated by carrier fluidization tank 150 flows into circulation filtration tank 160 through opening 161 in the partition wall.

The circulation filter tank 160 is a water treatment tank that captures solids. A baffle plate 162 , a filter carrier 164 , a third air lift pump 203 , and a circulation air lift pump 900 are provided inside the circulation filtration tank 160 . The water that has flowed into the circulation filtration tank 160 is guided below the filtration carrier 164 by the baffle plate 162 . The water below the circulation filtration tank 160 rises inside the filtration carrier 164 and moves above the filtration carrier 164 . Filtration carrier 164 may trap solids in the water. Also, the circulation filtration tank 160 can sediment and separate solids. The water treated by the circulation filtration tank 160 flows into the disinfection tank 170 through the opening 171 of the partition wall.

A third air lift pump 203 provided in the circulation filtration tank 160 uses air from a blower (not shown) to transfer the water above the filtration carrier 164 to the carrier fluidization tank 150 . As a result, water circulates between the carrier fluidization tank 150 and the circulation filtration tank 160 . Then, the aerobic treatment by the carrier fluidization tank 150 and the separation of solid matter by the circulation filtration tank 160 are repeated.

A circulating airlift pump 900 sucks water below the filter carrier 164 . A transfer channel 800 is connected to the circulation air lift pump 900 . The transfer channel 800 transfers the water sucked by the circulation air lift pump 900 to the contaminant removal tank 110 . As a result, the solid matter deposited on the bottom of the circulation filtration tank 160 and the water containing nitrate ions (nitration liquid) are transferred to the contaminant removal tank 110 . This transfer causes the water to circulate between the water treatment tanks 110-140 and the water treatment tanks 150-160. Hereinafter, the transfer flow path 800 and the circulation air lift pump 900 will also be referred to as a circulation device 1000 .

The disinfection bath 170 is equipped with a disinfectant 174 , and the disinfectant 174 is used to disinfect the water flowing into the disinfection bath 170 . The disinfected water flows into the discharge pump tank 180 through the opening 181 in the partition wall.

The discharge pump tank 180 has a discharge pump 182 . The discharge pump 182 transfers the water in the discharge pump tank 180 to the outside of the waste water treatment apparatus 100 . In this embodiment, the discharge pump 182 is an electric pump.

It should be noted that the outer wall 190 defines a plurality of manhole openings 700 located in the upper portion of the outer wall 190 . A worker can inspect the inside of the wastewater treatment apparatus 100 through the manhole opening 700 . For example, the operator measures the amount of water transferred by the circulation device 1000 per unit time, and adjusts the amount transferred by the circulation device 1000 so that the measured amount of water falls within a predetermined appropriate range. . For example, the operator adjusts the amount transferred by the circulation device 1000 by adjusting the opening of a valve (not shown) provided in a pipe connecting the circulation air lift pump 900 and a blower (not shown). .

A2. Configuration of circulation device 1000:
2A and 2B are explanatory diagrams showing the configuration of the circulation device 1000. FIG. FIG. 2(A) shows part of the contaminant removal tank 110 and part of the circulation filtration tank 160 viewed from the side. FIG. 2(B) shows part of the contaminant removal tank 110 and part of the circulation filtration tank 160 viewed downward. An upward direction Z in the drawing indicates a vertically upward direction. A second direction Y indicates a horizontal direction perpendicular to the first direction X. FIG. Hereinafter, the upward direction Z will also be referred to as the +Z direction, and the direction opposite to the upward direction Z (that is, the downward direction) will also be referred to as the -Z direction.

The circulation air lift pump 900 includes a pipe extending from a suction port 900i located at a position lower than the water level WL2 in the circulation filtration tank 160 to an outlet 900o located at a position higher than the water level WL2. In this embodiment, the suction port 900i is arranged at a position lower than the filter carrier 164 .

The transfer channel 800 is connected to the outlet 900 o of the circulation air lift pump 900 . In this embodiment, the transfer flow path 800 is arranged from the discharge port 900o of the circulation air lift pump 900 above the receiving portion 113 of the contaminant removal tank 110 (in this embodiment, a position higher than the water level WL1). It is a tubular device that extends to one opening 801 . The axis Ax is the central axis of the transfer channel 800 . The height of the axis Ax gradually decreases from the discharge port 900 o toward the first opening 801 . In addition, in this embodiment, the entire transfer channel 800 is arranged at a position higher than the water surface.

As shown in FIG. 2B, in this embodiment, the shape of the first baffle plate 112 is U-shaped when viewed downward (−Z direction). Both ends of the first baffle plate 112 are fixed to the partition wall 115 . A receiving portion 113 is an area surrounded by the partition wall 115 and the first baffle plate 112 . A first opening 801 is arranged in this receiving portion 113 .

The transfer flow path 800 includes a first pipe portion 810 connected to the circulation air lift pump 900, a hole forming pipe portion 300 connected to the first pipe portion 810, and a second pipe portion connected to the hole forming pipe portion 300. 820 and a valve 400 attached to the pore forming tube 300 . An end portion 820 e of the second tube portion 820 (that is, an end portion 820 e of the transfer channel 800 ) forms a first opening 801 . The hole-forming pipe portion 300 and the valve 400 are arranged in the contaminant removal tank 110 . In this embodiment, the hole-forming pipe portion 300 and the valve 400 are arranged above the water surface of the contaminant removing tank 110 . The circulation air lift pump 900 and the transfer channel 800 are made of resin such as polyvinyl chloride, for example.

FIGS. 3A to 3E are explanatory diagrams of the hole-forming tube portion 300. FIG. FIG. 3A shows the hole-forming pipe portion 300 viewed from below in the upward direction Z, and FIG. 3B shows the hole-forming pipe portion 300 viewed from the side in the second direction Y. , FIG. 3(C) shows the hole-forming tube portion 300 viewed downward (−Z direction) from above, and FIG. A view of the perforated tube 300 is shown. As shown in FIG. 3D, the hole-forming tube portion 300 is a tubular member centered on the axis Ax, and forms a columnar flow path 301 centered on the axis Ax.

As shown in FIGS. 3(A) to 3(C), the hole forming tube portion 300 includes a first socket portion 310 connected to the first tube portion 810 and a second socket portion 310 connected to the second tube portion 820. A socket portion 320 and a central tube portion 330 connecting the first socket portion 310 and the second socket portion 320 are provided. The axis Ax indicates the central axis of the hole-forming tube portion 300 (and thus the central tube portion 330). A second opening 802 is formed in the side surface of the central tube portion 330 (in this embodiment, the side surface on the downward (−Z direction) side). FIG. 3(E) is an EE section of FIG. 3(B), which is a section of the central tube portion 330 perpendicular to the axis Ax. This cross section shows the portion of the central tube portion 330 that forms the second opening 802 . As shown in the figure, a second opening 802 is formed in the side surface on the downward (−Z direction) side.

A first partial range R31 in the drawing indicates a partial range in which the central tube portion 330 is provided, of the entire circumferential range (that is, 360-degree range) centered on the axis Ax. As illustrated, the first partial range R31 is less than 360 degrees. The central pipe portion 330 is not formed in the second partial range R32, which is the remaining range, and the central pipe portion 330 forms a second opening 802 corresponding to the second partial range R32. A second partial range R32 indicates the range of the second opening 802 in the circumferential direction.

4A to 4D are explanatory diagrams of the valve 400. FIG. 4(A) shows the valve 400 viewed from below in the upward direction Z, FIG. 4(B) shows the valve 400 viewed from the side in the second direction Y, and FIG. 4(C). shows a cross-section of the valve 400 perpendicular to the axis Ax. As shown in FIG. 4C, the valve 400 includes a wall portion 410 having an arc-shaped cross section centered on the axis Ax, and four projections having a linear cross section projecting from the wall portion 410 to the outer peripheral side. Sections 421-424. The valve 400 has a shape obtained by extending this cross-sectional shape along the axis Ax. The cross-sectional shape of the valve 400 perpendicular to the axis Ax is the same regardless of the position in the direction parallel to the axis Ax.

Positions P1-P4 of protrusions 421-424, respectively, are shown in FIG. 4(C). Positions P1-P4 are fixed positions of the projecting portions 421-424 on the outer peripheral surface of the wall portion 410, and are positions in the circumferential direction about the axis Ax. Circumferential position may be indicated using an angle about the axis Ax relative to a predetermined reference line SL passing through the axis Ax. For example, the first position P1 may be indicated by a first angle Ag1 with respect to the reference line SL. In this embodiment, the positions P1-P4 are different from each other among the protrusions 421-424.

A first partial range R41 in the drawing indicates a partial range in which the wall portion 410 is provided in the entire circumferential range centered on the axis Ax. As illustrated, the first partial range R41 is less than 360 degrees. The wall portion 410 is not formed in the second partial range R42, which is the remaining range, and the wall portion 410 forms an opening 490 corresponding to the second partial range R42. A second partial range R42 indicates the range of the opening 490 in the circumferential direction.

The inner diameter D410 of the wall portion 410 (FIG. 4C) is approximately the same as or slightly smaller than the outer diameter D330 of the central tube portion 330 (FIG. 3A). Also, the width W490 of the opening 490 is smaller than the outer diameter D330 of the central tube portion 330 . And the valve 400 is elastically deformable. In this embodiment, when the valve 400 is deformed so that the width of the opening 490 is larger than the outer diameter D330 of the central pipe portion 330, the central pipe portion 330 is accommodated on the inner peripheral side of the wall portion 410. A valve 400 is attached to the outer peripheral side of the central tube portion 330 . A valve 400 attached to the central tube 330 is supported by the central tube 330 without falling out of the central tube 330 . The valve 400 is rotatable about the axis Ax with respect to the central tube portion 330 . FIGS. 4A to 4C show a state in which the opening 490 is arranged on the upward Z side.

5A to 5F are explanatory diagrams of the rotational positions of the valve 400. FIG. Each figure shows an orifice-forming tube 300 and a valve 400 attached to a central tube 330 of the orifice-forming tube 300 . Specifically, FIG. 5A shows the hole-forming pipe portion 300 and the valve 400 viewed downward (−Z direction) from above, and FIG. 5B shows the hole-forming pipe portion 300. and the valve 400 perpendicular to the axis Ax, and FIG. FIGS. 5(A) to 5(C) show the first rotational position RP1 where the opening 490 of the valve 400 is positioned on the upward Z side. FIGS. 5(D) to 5(F) show explanatory diagrams similar to FIGS. 5(A) to 5(C), respectively. FIGS. 5(D) to 5(F) show the second rotational position RP2 in which the opening 490 of the valve 400 is positioned downward (−Z direction).

As shown in FIG. 5B, when the valve 400 is attached to the central pipe portion 330, the first partial range R41 of the wall portion 410 of the valve 400 is the second opening 802 of the central pipe portion 330. It is wider than the two-part range R32. Therefore, by rotating the valve 400 so that the opening 490 of the valve 400 is positioned on the upward Z side, the wall portion 410 can cover the entire second opening 802 . That is, the second opening 802 is closed. Therefore, as shown in FIG. 5(C), the water transferred by the transfer channel 800 does not flow out from the second opening 802 but flows out from the first opening 801 . The water Wo1 flowing out from the first opening 801 flows into the contaminant removing tank 110 (specifically, the receiving section 113).

In this embodiment, the water flowing into the impurity removal tank 110 preferably flows into the receiving section 113 in order to suppress agitation of the accumulated sludge and scum in the impurity removal tank 110 . Therefore, during normal operation, the rotational position of the valve 400 is set to the position that closes the second opening 802 (for example, the first rotational position RP1 in FIGS. 5A-5C). The first rotational position RP1 is an example of a closed position where the wall portion 410 covers the second opening 802 .

At the first rotation position RP1, as shown in FIGS. 5A and 5B, the upward Z-side portion 330a of the central tube portion 330 is exposed through the opening 490 of the valve 400. As shown in FIG. In general, the parts on the upward Z side of the members in the wastewater treatment apparatus 100 are visible from the outside of the wastewater treatment apparatus 100 through the manhole opening 700 (FIG. 1). Therefore, in this embodiment, a closed information display is provided on the portion 330a on the upward Z side of the central tube portion 330 to display closed information indicating that the state of the valve 400 is a closed state in which the second opening 802 is closed. A portion 341 is provided. In this embodiment, the closed information display portion 341 is a sticker attached to the portion 330a, and displays a character string "during normal operation" as the closed information. The operator can easily confirm that the valve 400 is in the closed state by observing the closed information display portion 341 .

As shown in FIG. 5E , with the valve 400 attached to the central tube portion 330 , the second partial range R42 of the opening 490 of the valve 400 is the second portion of the second opening 802 of the central tube portion 330 . It has a size equal to or larger than the partial range R32. Therefore, the entire second opening 802 can be exposed through the opening 490 of the valve 400 by rotating the valve 400 so that the opening 490 of the valve 400 is positioned downward (−Z direction). That is, the second opening 802 is opened. Therefore, as shown in FIG. 5(F), the water transferred by the transfer channel 800 is dispersed through the first opening 801 and the second opening 802 and flows out. In this embodiment, the water Wo1 flowing out from the first opening 801 flows into the receiving portion 113, and the water Wo2 flowing out from the second opening 802 flows into the portion of the contaminant removing tank 110 outside the receiving portion 113. influx. It should be noted that the second rotational position RP2 is an example of an open position in which the wall portion 410 does not cover at least a portion of the second opening 802 .

Thus, when the water flows out from the two openings 801 and 802, the amount of water flowing out from each of the openings 801 and 802 per unit time is appropriately adjusted as compared with the case where the water flows out from the single opening 801. can be measured to For example, assume that the appropriate amount of water transferred by the circulator 1000 is 2 L/sec. Also assume that the operator uses a 2 L container (eg, a beaker) for the water volume measurement. In the state of FIG. 5(C), when the water Wo1 flowing out from the first opening 801 is received by the container, the water overflows from the container after the lapse of one second. Have difficulty. On the other hand, in the state of FIG. 5(F), the amount of water Wo1 flowing out from the first opening 801 per unit time can be approximately 1 L/sec, and the amount of water Wo2 flowing out from the second opening 802 per unit time can be approximately 1 L/sec. The water volume can be approximately 1 L/sec. In this case, by using a 2 L container, the amount of water per unit time (for example, 1 second) can be appropriately measured. The operator can appropriately calculate the amount of water transferred by the circulation device 1000 by adding the amount of water Wo1 and the amount of water Wo2. Then, the operator can easily adjust the transfer amount by the circulation device 1000 to an appropriate transfer amount.

At the second rotation position RP2, as shown in FIGS. 5(D) and 5(E), the first portion 410a of the wall portion 410 of the valve 400 opposite to the opening 490 is Located on the upward Z side. Therefore, in the present embodiment, an open information display section 451 for displaying open information indicating that the state of the valve 400 is an open state in which the second opening 802 is opened is provided on the first portion 410a of the wall section 410. is provided. In this embodiment, the open information display portion 451 is a sticker attached to the first portion 410a, and displays a character string "when checking the amount of water" as the open information. The operator can easily confirm that the valve 400 is in the open state by observing the open information display portion 451 .

After adjusting the transfer amount by the circulation device 1000, the operator rotates the valve 400 to change the rotational position of the valve 400 to the closed position (for example, the first rotational position RP1 (FIGS. 5A-5C). )) This allows the circulation device 1000 to appropriately transfer the water in the circulation filtration tank 160 to the receiving section 113 of the contaminant removal tank 110 .

6A and 6B are explanatory diagrams of another rotational position RP3 of the valve 400 for closing the second opening 802. FIG. FIGS. 6A and 6B show explanatory diagrams similar to FIGS. 5A and 5B, respectively. 5A and 5B, in the third rotational position RP3, the opening 490 of the valve 400 is positioned approximately in the horizontal direction (here, the second direction Y). is doing. Also in this case, the wall portion 410 can cover the entire second opening 802 . That is, the second opening 802 is closed. Such a third rotational position RP3 is suitable for normal operation, like the first rotational position RP1 (FIGS. 5(A) and 5(B)). The third rotational position RP3 is an example of a closed position where the wall portion 410 covers the second opening 802 .

At the third rotation position RP3, as shown in FIGS. 6A and 6B, the second portion 410b of the wall portion 410 between the opening 490 and the first portion 410a is oriented upward. Located on the Z side. Therefore, in the present embodiment, the closed information display section 441 for displaying closed information indicating that the valve 400 is in the closed state in which the second opening 802 is closed is provided on the second portion 410b of the wall portion 410. is provided. In this embodiment, the closed information display portion 441 is a sticker attached to the second portion 410b, and displays the character string "during normal operation" as the closed information. The operator can easily confirm that the valve 400 is in the closed state by observing the closed information display portion 441 .

Although not shown, the wall portion 410 can cover the entire second opening 802 even when the opening 490 of the valve 400 is located on the side opposite to the second direction Y. This rotational position is also suitable for normal operation. At this rotational position, the third portion 410c of the wall portion 410 opposite to the second portion 410b is located on the Z side. Therefore, in this embodiment, the third portion 410c of the wall portion 410 is provided with a closed information display portion 442 that displays closed information indicating that the valve 400 is closed. Although illustration is omitted, in the present embodiment, the closed information display portion 442 is a sticker attached to the third portion 410c, and displays a character string "under normal operation" as the closed information.

In this embodiment, the outer diameters of the socket portions 310 and 320 of the hole forming tube portion 300 are larger than the inner diameter D410 of the wall portion 410 (FIG. 4C). Therefore, displacement of the wall portion 410 in the direction parallel to the axis Ax such that the wall portion 410 overlaps the first socket portion 310 or the second socket portion 320 is suppressed. The wall portion 410 is supported by the central pipe portion 330 while being sandwiched between the two socket portions 310 and 320 .

In this embodiment, the size of the central tube portion 330 and the size of the wall portion 410 are configured so that the wall portion 410 can open and close the second opening 802 . Specifically, it is as follows. A length L410 in FIG. 4A is the length of the wall portion 410 in a direction parallel to the axis Ax. A length L330 in FIG. 3A is a length in a direction parallel to the axis Ax of the central tube portion 330. As shown in FIG. A length L802 is the length of the second opening 802 in a direction parallel to the axis Ax. The length L410 of the wall portion 410 is slightly shorter than the length L330 of the central tube portion 330 and sufficiently longer than the length L802 of the second opening 802. Therefore, the wall portion 410 can easily close the entire second opening 802 . Further, even if the position of the wall portion 410 in the direction parallel to the axis Ax is displaced between the two socket portions 310 and 320, the wall portion 410 can easily close the entire second opening 802. can be done.

As described above, in this embodiment, the wastewater treatment apparatus 100 (FIG. 1) includes a plurality of water treatment tanks 110-180 including the circulation filtration tank 160 and the contaminant removal tank 110. FIG. The wastewater treatment apparatus 100 is connected to a circulation air lift pump 900 that sucks water from the circulation filtration tank 160 and the circulation air lift pump 900, and transfers the water sucked by the circulation air lift pump 900 to the contaminant removal tank 110. and a flow path 800 . 5A to 5F and the like, the transfer flow path 800 includes a first opening 801 and a second opening 802 arranged closer to the circulation air lift pump 900 than the first opening 801. , to form The transfer channel 800 has a valve 400 that opens and closes the second opening 802 . In this embodiment, as shown in FIGS. 5(C) and 5(F), the openings 801 and 802 are arranged above the water surface of the contaminant removal tank 110 (that is, at a position higher than the high water level HWL). It is Thus, the first opening 801 is arranged at a position where the water Wo<b>1 flowing out from the first opening 801 flows into the contaminant removing tank 110 . As shown in FIG. 5F and the like, the second opening 802 is arranged at a position where the water Wo<b>2 flowing out from the second opening 802 flows into the contaminant removing tank 110 .

According to this configuration, as shown in FIGS. 5(D) to 5(F), by opening the valve 400, the water flowing from the transfer channel 800 into the contaminant removal tank 110 is diverted from the first opening 801. It can be distributed between the second openings 802 . Therefore, compared to the case where water flows out from one opening (for example, the first opening 801 (FIG. 5C)), the amount of water flowing out from each of the openings 801 and 802 per unit time can be reduced. Therefore, the operator can easily measure the amount of water per unit time flowing into the contaminant removing tank 110 from the transfer channel 800 . In this way, the operator can measure the amount of water transferred by the transfer channel 800 per unit time while suppressing the complication of the configuration of the waste water treatment apparatus 100 .

2(A), 2(B), 3(A) to 3(E), etc., the transfer channel 800 includes a hole forming tube portion 300 which is a tubular portion. there is The hole-forming tube portion 300 (FIG. 3B) forms a second opening 802 provided on the side surface of the hole-forming tube portion 300 . As shown in FIGS. 5(A) to 5(F), etc., the valve 400 includes a wall portion 410 attached to the outer peripheral side of the hole-forming tube portion 300 . The wall portion 410 has one or more open positions (for example, a second rotational position RP2) that do not cover at least a portion of the second opening 802, and one or more closed positions (for example, a position that covers the second opening 802). , rotational positions RP1 and RP3), and is attached to the outer peripheral side of the hole-forming pipe portion 300 movably. Therefore, an operator can easily open and close the second opening 802 by moving the wall portion 410 of the valve 400 between the open position and the closed position.

As shown in FIGS. 5A to 5F and the like, the wall portion 410 of the valve 400 is rotatably movable relative to the hole forming pipe portion 300 in the circumferential direction. attached to the The wall portion 410 forms a partial peripheral wall portion (hereinafter referred to as , the wall portion 410 is also referred to as a partial peripheral wall portion 410. The one or more closed positions are positions of rotational movement of the wall portion 410 in the circumferential direction, and are positions where the partial peripheral wall portion 410 covers the second opening 802. One or more open positions are positions of circumferential rotational movement of the wall portion 410, and the partial peripheral wall portion 410 is in the second opening. 5(D)-5(F), which is a position that does not cover at least a portion of 802. Accordingly, the operator can remove wall 410 of valve 400 from hole forming tube portion 300. The second opening 802 can be easily opened and closed by rotationally moving it in the circumferential direction.

Further, as shown in FIG. 4(C) and the like, the valve 400 includes protruding portions 421 to 424 that are fixed to the wall portion 410 and protrude toward the outer peripheral side. These protrusions 421-424 are provided at positions P1-P4 that are different from each other in the circumferential direction. Accordingly, an operator can easily rotationally move the wall 410 of the valve 400 by contacting any of the projections 421-424 with a tool such as a cleaning brush. For example, an operator can rotate the wall 410 from outside the wastewater treatment apparatus 100 through the manhole opening 700 (FIG. 1).

Moreover, as shown in FIG. Therefore, complication of the configuration of the transfer channel 800 can be suppressed. For example, the first opening 801 can be formed by a simple method of cutting the end 820 e of the transfer channel 800 . Note that in this embodiment, the first opening 801 is perpendicular to the axis Ax. Alternatively, the first opening 801 may be slanted with respect to the axis Ax. Also, the transfer channel 800 may include a reference portion that indicates the reference of the height of the water surface at the first opening 801 . The reference portion may have any configuration that indicates the reference of the water surface, such as a line formed on the inner surface of the end portion 820e or the outer surface, or a portion having a three-dimensional shape.

In addition, as shown in FIGS. 2A and 2B, the contaminant removal tank 110 includes a baffle plate 112 forming a receiving portion 113 for receiving water flowing into the contaminant removal tank 110. . In this embodiment, as shown in FIGS. 5(C) and 5(F), the first opening 801 is arranged inside the receiving portion 113, and the second opening 802 is arranged outside the receiving portion 113. ing. Thus, the first opening 801 is arranged at a position where the water flowing out from the first opening 801 flows into the receiving portion 113 of the contaminant removing tank 110 . The second opening 802 is arranged at a position where the water flowing out from the second opening 802 flows into a portion of the contaminant removing tank 110 different from the receiving portion 113 . Therefore, it is possible to suppress the size increase of the receiving portion 113 and, by extension, the baffle plate 112 .

B. Second embodiment of perforated tubing and valve:
FIGS. 7(A) to 7(E) are explanatory diagrams showing the hole forming pipe portion 300x and the valve 400x of the second embodiment. The hole forming tube 300x and the valve 400x can be used in place of the hole forming tube 300 and the valve 400 of the first embodiment.

FIG. 7A shows the hole-forming pipe portion 300x viewed from below in the upward direction Z, and FIG. 7B shows the hole-forming pipe portion 300x viewed from the side in the second direction Y. 7(C) shows the hole-forming tube portion 300x viewed downward (−Z direction) from above. The only difference from the hole forming tube 300 of FIGS. 3A-3C is that the center tube 330x is longer than the center tube 330 of the first embodiment. The configuration of other portions of the hole-forming tube portion 300x is the same as the configuration of the corresponding portion of the hole-forming tube portion 300 of the first embodiment (same elements are denoted by the same reference numerals, and description thereof is omitted). ). The central tube portion 330x has a second opening 802 formed on the side surface on the downward (−Z direction) side of the central tube portion 330x. The second opening 802 is formed at a position deviated from the center of the central pipe portion 330x toward the second socket portion 320 side. Further, as shown in FIG. 7(C), an open information display portion 451 is provided in a portion near the second socket portion 320 of the portion on the upward Z side of the central tube portion 330x, and the first socket portion A closed information display section 341 is provided in a portion near 310 .

7(D) and 7(E) are explanatory diagrams of the valve 400x. FIG. 7D shows the valve 400x viewed from the side in the second direction Y, and FIG. 7E shows a cross section of the valve 400x perpendicular to the axis Ax. In this embodiment, valve 400x includes a cylindrical wall portion 410x centered on axis Ax and a rod 480x fixed to wall portion 410x.

The inner diameter D410x of the wall portion 410x (FIG. 7(E)) is approximately the same as or slightly larger than the outer diameter D330x of the central tube portion 330x (FIG. 7(A)). In this embodiment, the valve 400x is attached to the outer peripheral side of the central pipe portion 330x so that the central pipe portion 330x is accommodated on the inner peripheral side of the wall portion 410x. For example, the valve 400x is fitted in the central tube portion 330x while the central tube portion 330x and the first socket portion 310 are separated. After that, the first socket portion 310 is fixed to the central pipe portion 330x. A valve 400x attached to central tube 330x is supported by central tube 330x without falling out of central tube 330x. The valve 400x is movable in a direction parallel to the axis Ax with respect to the central tube portion 330x.

FIGS. 8A and 8B are explanatory diagrams of movement positions of the valve 400x. Each figure shows a part of the contaminant removal tank 110 viewed from the side. Each figure shows a pore-forming tube 300x and a valve 400x attached to a central tube 330x of the pore-forming tube 300x. The circulation device 1000x of this embodiment is obtained by replacing the transfer channel 800 of the circulation device 1000 (FIG. 2A) of the first embodiment with a transfer channel 800x. The transfer channel 800x is obtained by replacing the hole forming pipe portion 300 and the valve 400 in the transfer channel 800 of the first embodiment with the hole forming pipe portion 300x and the valve 400x.

FIG. 8A shows the first position SP1 where the valve 400x overlaps the second opening 802. FIG. In this embodiment, the first position SP1 is the position at which the valve 400x contacts the second pipe section 820. As shown in FIG. FIG. 8B shows the second position SP2 where the valve 400x is away from the second opening 802. FIG. In the present embodiment, the second position SP2 is the position where the valve 400x contacts the first tube portion 810. As shown in FIG. In this embodiment, the size of central tube portion 330x and the size of wall portion 410x are configured such that wall portion 410x can open and close second opening 802 . Specifically, it is as follows. A length L330x in FIG. 7A is a length in a direction parallel to the axis Ax of the central tube portion 330x. The length L410x in FIG. 7D is the length of the wall portion 410x in the direction parallel to the axis Ax. The length L410x of the wall portion 410x is sufficiently longer than the length L802 of the second opening 802 (FIG. 7A). The length L330x of the central tube portion 330x is at least twice the length L410x of the wall portion 410x.

As described above, the wall portion 410x at the first position SP1 (FIG. 8A) can cover the entire second opening 802. As shown in FIG. That is, the second opening 802 is closed. Therefore, as shown in FIG. 8A, the water transferred by the transfer channel 800x does not flow out from the second opening 802, but flows out from the first opening 801. As shown in FIG. The water Wo1 flowing out from the first opening 801 flows into the contaminant removing tank 110 (specifically, the receiving section 113). Further, when the valve 400x is positioned at the first position SP1, the open information display portion 451 is hidden by the wall portion 410x of the valve 400x, and the closed information display portion 341 is exposed without being hidden by the wall portion 410x. do. By observing the closed information display portion 341, the operator can easily confirm that the valve 400x is in the closed state. The first position SP1 is an example of a closed position where the wall portion 410x covers the second opening 802. FIG.

Moreover, when the wall portion 410x is arranged at the second position SP2 (FIG. 8B), the entire second opening 802 is exposed. That is, the second opening 802 is opened. Therefore, the water transferred by the transfer channel 800x is dispersed from the first opening 801 and the second opening 802 and flows out. In this embodiment, the water Wo1 flowing out from the first opening 801 flows into the receiving portion 113, and the water Wo2 flowing out from the second opening 802 flows into the portion of the contaminant removing tank 110 outside the receiving portion 113. influx. Further, when the valve 400x is positioned at the second position SP2, the open information display portion 451 is exposed without being hidden by the wall portion 410x of the valve 400x, and the closed information display portion 341 is hidden by the wall portion 410x. be By observing the open information display portion 451, the operator can easily confirm that the valve 400x is in the open state. The second position SP2 is an example of an open position where the wall portion 410x does not cover at least a portion of the second opening 802. FIG.

In this example, valve 400x includes rod 480x. As shown in FIGS. 8A and 8B, the rod 480x is arranged to extend upward in the Z direction from the wall portion 410x. An operator can reach through the manhole opening 700 (FIG. 1), grab the rod 480x, and manipulate the rod 480x to move the valve 400x between the first position SP1 and the second position SP2. . Although not shown, the manhole opening 700 may be provided with a fixture that secures the end of the rod 480x with the valve 400x in the first position SP1.

As described above, in this embodiment, the wall portion 410x of the valve 400x is movable relative to the central pipe portion 330x in the axial direction (here, the direction parallel to the axis Ax) in which the central pipe portion 330x extends. is attached to the outer peripheral side of the central tube portion 330x. The one or more closed positions are positions of axial movement of the wall portion 410x and include a first position SP1 where the wall portion 410x covers the second opening 802 . The one or more open positions include a second position SP2, which is a position of axial movement of wall portion 410x such that wall portion 410x does not cover at least a portion of second opening 802. FIG. Therefore, an operator can easily open and close the second opening by axially moving the wall portion 410x of the valve 400x with respect to the central tube portion 330x.

Valve 400x also has a rod 480x attached to wall 410x for operator manipulation to move wall 410x axially. Therefore, the worker can easily move the wall portion 410x in the axial direction by operating the rod 480x.

C. Variant:
(1) Various methods may be used to measure the amount of water transferred by the circulation devices 1000 and 1000x per unit time. In each of the embodiments described above, the second opening 802 is formed on the side surface in the middle of the transfer channels 800 and 800x. Therefore, when the amount of transferred water is so large that water flows out from the first opening 801 with the valves 400 and 400x open, even if the amount of water transferred by the circulation devices 1000 and 1000x changes, the second opening The change in the amount of water flowing out of 802 is small. Therefore, as the amount of water flowing out from the second opening 802, a reference amount of water that is measured in advance may be used instead of the measured value. Then, the sum of the actually measured amount of water flowing out from the first opening 801 and the reference amount of water may be used as an approximate value of the transferred amount of water.

(2) In the embodiment shown in FIGS. 7A to 7E, the second opening 802 may be formed at a position offset from the center of the central tube portion 330x toward the first socket portion 310 side. The first position SP1 (FIG. 8A) may indicate the open position, and the second position SP2 (FIG. 8B) may indicate the closed position.

(3) In the embodiment of FIG. 5(E), various rotational positions of the valve 400 when the second partial range R42 of the opening 490 of the valve 400 is greater than the second partial range R32 of the second opening 802. , the entire second opening 802 can be exposed through the opening 490 of the valve 400 . Each of such multiple rotational positions of valve 400 is an example of an open position.

When water is allowed to flow out from the second opening 802 (FIGS. 5(F) and 8(B)), the valves 400 and 400x may partially cover the second opening 802 . Thus, valves 400 , 400 x may be positioned in various positions that do not cover at least a portion of second opening 802 to allow water to flow out of second opening 802 . However, in order to suppress variations in the amount of water flowing out from the second opening 802, it is preferable to adopt a position that does not cover the entire second opening 802. FIG.

(4) In the embodiment of FIGS. 4(A) to 4(C), the valve 400 is not limited to four protrusions 421-424, but is fixed to the wall 410 and protrudes toward the outer periphery. The protrusion may have N protrusions provided at N (N is an integer equal to or greater than 2) positions different from each other in the circumferential direction. The N protrusions may include a plurality of protrusions having different shapes. However, such protrusions may be omitted.

(5) The configuration of the valve may be various other configurations instead of the configuration of the valve 400 (FIG. 4A, etc.) and the valve 400x (FIG. 7D, etc.). For example, bar 480x (FIG. 6(D)) may be omitted. In addition, the valve 400 of the first embodiment (FIGS. 4A-4( C)) may be attached. In this case, both the second rotational position RP2 in FIG. 5(F) and the second position SP2 in FIG. 8(B) can be used as the open position. Further, the position of the central pipe portion 330x in the direction parallel to the axis Ax is the same as the first position SP1 in FIG. A position that is the same as the position (eg, rotational positions RP1, RP3 in FIGS. 5A and 6A) can be used as the closed position. Also, the valve may be any valve capable of opening and closing an opening, such as a ball valve, in place of the valves 400 and 400x that include a wall portion attached to the outer peripheral side of the pipe portion.

(6) The configuration of the transfer channels may be various other configurations instead of the configurations of the transfer channels 800 and 800x described above. For example, the second opening 802 (FIGS. 3(B) and 7(B)) is arranged in the horizontal direction (for example, in the second direction) instead of the side surface on the downward (−Z direction) side of the central tube portions 330 and 330x. It may be formed on the Y) side surface. The valve covers at least a portion of the second opening provided in the side of the tube (e.g., central tube 330, 330x), such as walls 410, 410x of Figures 4A and 7D. A wall portion may be provided movably attached to the outer peripheral side of the tube portion between an open position where there is no opening and a closed position where the second opening is covered. The movement of the wall is not limited to rotational movement about the central axis of the tube and parallel movement parallel to the central axis of the tube, but may be arbitrary movement. Moreover, the configuration for movably attaching the wall portion to the pipe portion may be any configuration. For example, the tube may comprise a support such as a guide rail that movably supports the wall. 5(A) and 7(A), the transfer flow path is defined as the movable range in the axial direction of the wall by contacting the wall (here, the axial The direction may be provided with a limiting portion that limits the direction in which the tube portion extends. However, such restrictions may be omitted.

3(C), FIG. 4(B), FIG. 4(C), and FIG. 7(C), the transfer channel is provided with a closed information display portion. you can The closed information display portion is a portion of the transfer channel that is difficult to observe from the manhole opening 700 when the wall portion of the valve is in the open position, and is a portion of the manhole opening when the wall portion of the valve is in the closed position. It is preferably provided in a portion that can be easily observed from 700 . The portion that can be easily observed from the manhole opening 700 may be, for example, the portion of the transfer channel located on the upward Z side, which is exposed without being hidden by the valve. The portion that is difficult to observe from the manhole opening 700 may be, for example, a portion hidden by the wall of the valve, or a portion of the transfer channel (eg, valve) located on the downward (−Z direction) side. . Further, the transfer channel may be provided with an open information display section like the open information display section 451 in FIGS. 4A and 7C. The open information display portion is a portion of the transfer channel that is easily observable from the manhole opening 700 when the wall of the valve is in the open position, and the manhole opening when the wall of the valve is in the closed position. It is preferably provided in a portion that is difficult to observe from 700 . The information indicated by each of the closed information display section and the open information display section may be arbitrary information (for example, character strings, symbols, pictograms, etc.) indicating the state of the valve (closed state or open state). In addition, the closed information display portion and the open information display portion are directly attached to a portion of the transfer channel (for example, the hole forming pipe portions 300 and 300x (FIGS. 5A and 7C)) instead of the seal. It may have any configuration that indicates information, such as a printed matter printed on the surface, or a portion that is a part of the transfer channel and has a three-dimensional shape. One or both of the closed information display section and the open information display section may be omitted.

Also, the ends 820e of the transfer channels 800, 800x may be closed, and the first openings 801 may be provided in the middle of the transfer channels 800, 800x, like the second openings 802. An operating rod may be attached to the first embodiment valve 400 (FIGS. 4A-4C). Also, the total number of combinations of the second openings and the valves may be two or more.

(7) The pump for sucking water to be supplied to the transfer channel may be any pump capable of sucking water, such as an electric pump, instead of an air lift pump such as the circulation air lift pump 900 .

(8) The configuration of the wastewater treatment apparatus may be any other configuration instead of the configuration of FIG. For example, the plurality of water treatment tanks used for wastewater treatment may be composed of any other water treatment tanks instead of the combination of water treatment tanks 110-180 in FIG. For example, the plurality of water treatment tanks may include various water treatment tanks such as a flow control tank, a membrane treatment tank having a membrane separation device, and the like. Also, a plurality of water treatment tanks used for water treatment may be provided dispersedly in a plurality of bodies. In either case, the pump and transfer channel may transfer water between two water treatment tanks arbitrarily selected from a plurality of water treatment tanks included in the wastewater treatment apparatus. In general, a wastewater treatment apparatus includes a plurality of water treatment tanks including a first water treatment tank and a second water treatment tank, a pump for sucking water from the second water treatment tank, and a pump connected to the pump. and a transfer channel for transferring water sucked by the pump to the first water treatment tank. The transfer channel may form a first opening and a second opening arranged closer to the pump than the first opening, and may include a valve for opening and closing the second opening. The first opening is arranged at a position where water flowing out from the first opening flows into the first water treatment tank, and the second opening is arranged at a position where water flowing out from the second opening flows into the first water treatment tank. may be The first water treatment tank may be a water treatment tank without a baffle plate. The transfer channel may include a curved portion. The wastewater treatment device may include K (K is an integer equal to or greater than 2) bodies including a first body and a second body. The first body may include one or more water treatment tanks including the first water treatment tank, and the second body may include one or more water treatment tanks including the second water treatment tank. The pump is configured to draw water from the second water treatment tank of the second body, and the transfer channel is configured to transfer water drawn by the pump to the first water treatment tank of the first body. may be

Although the present invention has been described above based on examples and modifications, the above-described embodiments of the present invention are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. The present invention may be modified and improved without departing from its spirit, and the present invention includes equivalents thereof.

DESCRIPTION OF SYMBOLS 100... Wastewater treatment apparatus, 110... Impurity removal tank, 111... Opening, 112... 1st baffle plate, 113... Receiving part, 114... 2nd baffle plate, 115... Partition wall, 120... Preliminary carrier fluidization tank, 122 Air diffuser 123 Carrier 130 First chamber of anaerobic filter bed tank 131 Opening 132 Baffle plate 134 Anaerobic filter bed 140 Second chamber of anaerobic filter bed tank 141 Opening 144 Anaerobic filter bed 150 Carrier fluidization tank 152 Air diffuser 153 Carrier 160 Circulation filtration tank 161 Opening 162 Baffle plate 164 Filtration carrier 170 Disinfection tank 171 Opening 174 Disinfectant 180 Discharge pump tank 181 Opening 182 Discharge pump 190 Outer wall 190b Body 201 First air lift pump 202 Second air lift pump 203 Third air lift pump 300, 300x... hole-forming tube portion, 301... flow path, 310... first socket portion, 320... second socket portion, 330, 330x... central tube portion, 330a... portion, 400, 400x... valve, 410, 410x... wall portion (partial peripheral wall portion) 410a first portion 410b second portion 410c third portion 421-424 projecting portion 341 closed information display portion 441 closed information display portion 442 closed information display Part 451... Open information display part 480x... Rod 490... Opening 700... Manhole opening 800, 800x... Transfer channel 801... First opening 802... Second opening 810... First pipe part 820 Second pipe portion 820e End 900 Circulation air lift pump 900i Suction port 900o Discharge port 1000, 1000x Circulation device W Drainage Ax Axis

Claims (8)

A wastewater treatment apparatus comprising a plurality of water treatment tanks including a first water treatment tank and a second water treatment tank;
a pump for sucking water from the second water treatment tank;
a transfer channel connected to the pump for transferring water sucked by the pump to the first water treatment tank;
with
The transfer flow path forms a first opening and a second opening arranged closer to the pump than the first opening, and includes a valve that opens and closes the second opening,
The first opening is arranged at a position where the water flowing out from the first opening flows into the first water treatment tank,
The second opening is arranged at a position that allows the water flowing out from the second opening to flow into the first water treatment tank,
Wastewater treatment equipment. The wastewater treatment equipment according to claim 1,
The transfer channel includes a tubular portion that is a tubular portion,
The pipe portion forms the second opening provided on the side surface of the pipe portion,
The valve includes a wall portion attached to the outer peripheral side of the pipe portion,
The wall portion is movable between one or more open positions that do not cover at least a portion of the second opening and one or more closed positions that cover the second opening. attached to the outer periphery of the
Wastewater treatment equipment. The wastewater treatment equipment according to claim 2,
The wall portion of the valve is attached to the outer peripheral side of the pipe portion so as to be rotatable in the circumferential direction with respect to the pipe portion,
The wall portion includes a partial peripheral wall portion that covers a part of the outer peripheral surface of the pipe portion in the circumferential direction,
The one or more closed positions include a position of rotational movement of the wall portion in the circumferential direction and a position where the partial peripheral wall portion covers the second opening;
The one or more open positions are positions of rotational movement of the wall portion in the circumferential direction, and include positions where the partial peripheral wall portion does not cover at least a portion of the second opening.
Wastewater treatment equipment. The wastewater treatment equipment according to claim 3,
The valve is a projecting portion fixed to the wall portion and projecting toward the outer peripheral side, and is provided at N different positions (N is an integer of 2 or more) in the circumferential direction. having a protrusion,
Wastewater treatment equipment. The wastewater treatment equipment according to any one of claims 2 to 4,
the wall portion of the valve is attached to the outer peripheral side of the pipe portion so as to be movable relative to the pipe portion in an axial direction, which is the direction in which the pipe portion extends;
wherein the one or more closed positions include positions of axial movement of the wall, wherein the wall covers the second opening;
The one or more open positions include positions of axial movement of the wall, wherein the wall does not cover at least a portion of the second opening.
Wastewater treatment equipment. The wastewater treatment equipment according to claim 5,
wherein the valve has a rod attached to the wall for manipulation by an operator to move the wall in the axial direction;
Wastewater treatment equipment. The wastewater treatment equipment according to any one of claims 1 to 6,
The first opening is provided at an end of the transfer channel,
Wastewater treatment equipment. The wastewater treatment equipment according to any one of claims 1 to 7,
The first water treatment tank comprises a baffle plate forming a receiving portion for receiving water flowing into the first water treatment tank,
The first opening is arranged at a position to allow the water flowing out from the first opening to flow into the receiving portion of the first water treatment tank,
The second opening is arranged at a position that allows the water flowing out from the second opening to flow into a portion of the first water treatment tank different from the receiving portion,
Wastewater treatment equipment.

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