JP2002177977A - Fluid transfer equipment and swage septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cost effectively provide fluid transfer equipment and septic tank which are simple in structure, are less restricted on the places of installation, make simplification possible and have a constant flow rate characteristic. SOLUTION: The fluid transfer equipment which is installed with an air pipe opened into a fluid storage tank and capable of discharging air into a lifting pipe and ladles up the fluid by discharging the air into the lifting pipe to lower the apparent specific gravity of the fluid in the lifting pipe is provided with a return/advection pipe 20 which changes the flow of fluid from the ascending flow in the lifting pipe to an approximately horizontal flow at a point for advecting the fluid in the upper part of the lifting pipe 200B and further changes the flow to a perpendicular direction on a horizontal plane. The return/ advection pipe 20 is provided with a weir 2 for liquid return formed by partly notching the pipe and is further provided with a submerged weir (a second fluid transfer rate regulating means) 22 capable of changing the opening area at the port of the liquid advection pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer device for transferring a fixed amount of fluid, and a sewage purification tank provided with the fluid transfer device.

[0002]

2. Description of the Related Art Conventionally, a device for transferring a fluid by discharging air into a pumping pipe to reduce the apparent specific gravity in the pipe, for example, an air lift pump has been known as a means for transferring the fluid. It is hardly affected by the fluid pumping height and can achieve a constant fluid transfer. Here, the quantitative fluid transfer device and the septic tank provided with the device will be described with reference to the drawings. FIG. 6 is an explanatory sectional view of a conventional sewage purification tank, and FIG. 7 is a perspective view of a main part of an air lift pump as a fluid transfer means provided in the tank. The sewage purification tank 1 is divided into a plurality of treatment tanks by a partition 2, and sewage is sequentially purified through the plurality of treatment tanks. Sewage flows from the inlet 3 to the outlet 4
From the upstream side, the first anaerobic filter bed tank 5 (a tank also functioning as an inflow load adjusting tank), the second anaerobic filter bed tank 6, the aerobic filter bed tank 7, the treatment water tank 8, and the disinfecting tank 9 are sequentially purified on the way. Is disinfected and discharged. The first anaerobic filter bed tank 5 is configured so that its water level can be varied from a minimum water level (LWL) to a maximum water level (HWL). The change in the water level in the tank 5 is absorbed, and the change in the inflow water does not directly affect the tanks after the second anaerobic filter bed tank 6. Thus, the first anaerobic filter bed tank 5 has an inflow load adjusting function. An air lift pump 10 is disposed at the boundary between the first anaerobic filter bed tank 5 and the second anaerobic filter bed tank 6, and is opened from the opening 12 of the pumping pipe (located at the same level as LWL). Sewage is sucked and transferred to the second anaerobic filter bed tank 6. In addition, the air lift pump 10 is often used for domestic sewage purification tanks because it has few moving parts, few failures, and the liquid transfer speed can be freely changed by adjusting the amount of air.

FIG. 7 is a partial perspective view of the air lift pump 10.
Shown in The air lift pump 10 has an air pipe 1
3, the water in the first anaerobic filter bed tank 5 is transferred from the airlift cheese 16 to the second anaerobic filter bed tank 6 by lowering the apparent specific gravity in the pumping pipe 11. The air lift pump 10 having this configuration has a relatively simple structure, but has a drawback that the liquid transfer speed (quantitative property) is easily affected by the liquid level in the first anaerobic filter tank 5.

In order to overcome the above-mentioned difficulties, there have been proposed an air lift pump having a flow rate adjusting chamber and a two-stage air lift pump for pumping a liquid in two stages (Japanese Patent Laid-Open No. 6-285484).

[0005]

However, although stabilization of the amount of water to be transferred can be achieved by using a two-stage air lift pump or a flow rate adjusting basin, quantitative performance can be obtained. Needless to say, the method becomes complicated. In addition, since the number of parts increases, there are also problems related to an increase in the number of assembling steps and an increase in cost. Furthermore, in a sewage purifying tank that requires a small space, the structure of a pump (fluid transfer device) becomes large, and thus there are also problems with the arrangement of the device and piping management.

SUMMARY OF THE INVENTION An object of the present invention is to economically provide a fluid transfer device having a constant flow rate and a septic tank which has a simple structure, has less restrictions on an installation place, and can be simplified.

Another object of the present invention is to provide a fluid transfer device and a septic tank in which the transfer amount can be easily adjusted.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided an air pipe which is opened in a fluid storage tank and is capable of discharging air inside a pumping pipe, and discharges air into the pumping pipe to discharge the fluid in the pumping pipe. In the fluid transfer device for pumping the fluid by reducing the apparent specific gravity of the fluid, the fluid flow is changed from a rising flow in the water pumping pipe to a flow in a substantially horizontal direction at a location where the fluid is transferred to the upper part of the water pumping pipe. A return and advection pipe having a direction perpendicular to the upper direction is provided. The return and advection pipe has a liquid return weir in which a part of the pipe is cut off. Transfer amount adjusting means).

The amount of air to be supplied can be changed by adjusting the amount of air supplied from the air pipe into the pumping pipe by the first fluid transfer adjusting means.

Further, the sewage purification tank has a first fluid transfer amount adjusting means capable of changing a fluid transfer amount by adjusting an amount of air supplied from an air pipe into the pumping pipe, and a weir height in the liquid transfer pipe. To enable adjustment of the fluid transfer volume by changing
Wherein a fluid transfer device provided with the fluid transfer amount adjusting means is provided.

(Operation) According to the present invention, the amount of air supplied from the air pipe to the pumping pipe is adjusted by the first transfer amount adjusting means, so that the liquid transfer speed and the transfer amount can be changed. By changing the opening area of the advection tube by means of the transfer amount adjusting means (2), it is possible to adjust the amount of fluid transfer, and because excess wastewater is returned, it is hardly affected by the height of pumping up the fluid, and it is possible to transfer quantitatively And

[0012]

FIG. 1 is a longitudinal sectional view of a sewage purification tank provided with a fluid transfer device according to the present invention. Note that the same components as those of the sewage purification tank shown in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

In the sewage purification tank 100, a plurality of treatment tanks are formed by partitioning the inside of the purification tank with a partition 2.

The first anaerobic filter bed tank 5 stores sewage flowing from the inflow port 3 and performs anaerobic treatment, and adjusts the water level of the inflow water to a high water level (HWL) and a low water level (LW). .L.) To stabilize the amount of sewage transferred to the downstream treatment tank (inflow load adjustment tank).
Function. And this 1st anaerobic filter bed tank 5
The sewage stored in the tank is pumped up by the fluid transfer device 200 and transferred to the second anaerobic filter bed tank 6. In this embodiment, the fluid transfer device 200 is used for the transfer of sewage from the first anaerobic filter bed tank 5 to the second anaerobic filter bed tank 6. It can be installed at any of the advection sections in the anaerobic filter bed tank 6, the aerobic filter bed tank 7, and the treated water tank 8, or at a plurality of locations.

The fluid transfer device 200 has a lower portion connected to a U-shaped tube, and an opening 211 of the water pumping tube having a low water level L.L. W. First pumping pipe 200A which is opened at a level lower than L
, A second pumping pipe 200B having an air pipe connected to the air supply mechanism therein, and a U-shaped pipe 200C connecting the first pumping pipe 200A and the second pumping pipe 200B. Then, by discharging air into the second pumping pipe 200B, the apparent specific gravity of the sewage (fluid) in the second pumping pipe 200A is reduced, and the sewage is pumped up from the first pumping pipe 200A.

The sewage thus pumped up by the fluid transfer device 200 and transferred to the second anaerobic filter tank 6 is subjected to anaerobic treatment in the second anaerobic filter tank 6 and then to the aerobic filter tank 7.
The water is then aerobic-treated and further discharged from the outlet 4 via the treatment water tank 8 and the disinfection tank 9.

The fluid transfer device 200 is required to have durability against the environment in which it is used. Therefore, depending on the environment in which it is used, the material of the component parts (tank wall, partition plate, etc.) is
Specifically, it is preferable to use stainless steel, aluminum, aluminum alloy, steel material or the like. Further, it is preferable to use plastics, specifically, polyethylene, polypropylene, polybutene, vinyl chloride, and the like as pipes (for example, first and second pumping pipes, U-shaped pipes, and the like). Each component can be joined by screwing, welding (welding), bonding, or the like.

Next, the fluid transfer device 200 will be described. FIG. 2 is a longitudinal side view of a fluid transfer port in the fluid transfer device,
FIG. 3 is a perspective view, and FIG. 4 is an operation explanatory view of the return and advection pipe.

As shown in FIG. 1, one end of the opening 2 has a suction.
An air lift cheese 25 is connected to the upper part of the second pumping pipe 200B which is connected to the first pumping pipe 200A set to 11 via a U-shaped pipe 200C. Second pumping pipe 200B
An air pipe 27 for discharging air into the second pumping pipe 200B is inserted through the air lift cheese 25 and installed concentrically in the second water pumping pipe 200B. The air pipe 27 is provided with an air supply pipe 29.
Then, air is supplied into the second pumping pipe 200B through the adjustment valve 28 as shown by a dotted arrow. The air outlet 270 at the tip of the air pipe 27 has a distance L1 (see FIG. 1) downward from the low water level (LWL) of 250 mm or more, depending on the pumping height, and is opened at this position to open the air. Is desirably discharged. Also, U-shaped tube 200C
The upper opening of the suction port 211 of the first pumping pipe 200A
It is desirable that the distance L2 from the distance (see FIG. 1) be 270 mm or more.

A gap U is provided between the second pumping pipe 200B, the inner peripheral surface of the air lift cheese 25, and the outer peripheral surface of the air pipe 27 for raising the discharged air and sewage and pumping it up. The air pipe 27 is connected to the second pumping pipe 200.
B and the outside of the air lift cheese 25 may be deformed so as to be inserted from the lower side surface of the second pumping pipe 200B. In this case, it is desirable that the air tube insertion position be approximately 270 mm or more from the suction opening 211.

The air lift cheese 25 is provided with a return and advection pipe 20 which extends perpendicularly to the pumping direction of the second pumping pipe 200B. Return and advection pipe 20 is L
A return weir 21 that bends into a letter shape is connected. The return weir 21 has a trough-like shape with a semicircular cross section that is opened by cutting out the upper part. The return weir 21 is connected to the advection tube 23. The advection pipe 23 is opened to transfer the sewage into the second anaerobic filter bed tank 6 which is the next chamber. A submerged weir 22 is provided at a boundary between the return weir 21 and the advection pipe 23 at the advection port 230 of the advection pipe.

The descent weir 22 is movable in the vertical direction and the direction of the arrow y, and adjusts the opening area of the advection port 230 of the advection tube 23. For example, by moving the submersible weir 22 to the upper part, the opening of the advection port 230 becomes larger, and by moving the submersible weir 22 to the lower part, the opening of the advection port 230 becomes smaller. The return and advection pipe 20 is provided by being integrally formed with the air lift cheese 25 or by being connected as a separate part.

The fluid transfer device 200 thus configured
The flow of water will be described with reference to FIGS. First, the sewage flowing from the opening 211 of the pumping pipe of the first pumping pipe 200A passes through the U-shaped pipe 200C and the second pumping pipe 200B.
Flows into. Then, the sewage whose apparent specific gravity has decreased due to the discharged air rises in the gap U between the second pumping pipe 200B and the air pipe 27. Then, it flows into the return and advection pipe 20. At this time, the amount of sewage flowing into the return and advection pipe 20 and the rising speed of the sewage are adjusted by the amount of air discharged from the air pipe 27. The discharge amount of the air is adjusted by the adjustment valve 28. The means for adjusting the transfer amount and speed of the wastewater based on the air discharge amount in this way is referred to as first transfer amount adjusting means.

That is, at this stage, the air rises, and the sewage is changed from a rising flow to a flow in a substantially horizontal direction as indicated by an arrow w, and gas-liquid separation is performed. Then, the sewage flows from the return dam 21 into the advection pipe 23 and is transferred to the second anaerobic filter bed tank 6 as indicated by an arrow w2. Here, by moving the dive weir 22 to the upper part to increase the area of the advection port 230, the transfer amount of the sewage to the second anaerobic filter bed tank 6 is increased. In addition, by moving the descent weir 22 downward to reduce the area of the advection port 230, the transfer amount of the sewage to the second anaerobic filter bed tank 6 is reduced. When a large amount of sewage is pumped up from the area of the advection port 230, the excess sewage passes over the weir of the gutter-shaped return weir 21 and enters the first anaerobic filter tank 5 as shown by an arrow w1. Will be returned. In this way, the adjustment of the transfer amount by the descent weir 22 and the return weir 21
The return adjustment of the excess wastewater is referred to as a second transfer amount adjustment mechanism. As described above, the return and advection pipe 20 provided with the second transfer amount adjusting mechanism is configured so that the sewage pumped from the first anaerobic filter bed tank 5 by the first pumping pipe 200A and the second pumping pipe 200B is provided in a predetermined manner. The excess sewage is returned to the first anaerobic filter bed tank 5 while being transferred to the second anaerobic filter bed tank 6 in the next stage at a flow rate.

The fluid transfer device 200 having this configuration is
By moving the descent weir 22 of the advection port 230 up and down to change the weir height, the opening area of the advection port 230 is adjusted, and the amount of transferred water is adjustable. Further, a handle or catch 220 is provided on the upper part of the dive weir 22 so that the dive weir 22 can be manually operated. Furthermore, by engraving a scale 225 at an appropriate place such as the side of the dive weir 22,
The transfer amount can be set without measuring.

As described above, in the sewage purification tank 100, the sewage flowing into the first anaerobic filter bed tank 5 from the inlet 3 is stored so as to fluctuate between a high water level (HWL) and a low water level (LWL), and is subjected to anaerobic treatment. Is done. And the fluid transfer device 200
In the above, the air supplied from the air supply pipe 29 to the air pipe 27 through the adjustment valve 28 discharges air from the fuze port 270 into the water pumping pipe 200B to lower the apparent specific gravity of the sewage in the water pumping pipe. Raise and pump sewage. The sewage pumped up while the rising speed and the pumping amount of the sewage are adjusted by the adjusting valve 28, which is the first fluid transfer amount adjusting means, is separated into gas and liquid when reaching the inside of the air lift cheese 25, and the water is returned and transferred. It flows into 20. Then, it is guided to the return weir 21 and the advection port 230
And flows through the dive weir 22 into the second anaerobic filter bed tank 6. At this time, the sewage in the return and advection pipe 20 is controlled to be substantially constant by the return weir 21 formed in the sewage return unit serving as the second fluid transfer amount adjusting means and the descent weir 22 provided in the advection port 230. Therefore, the flow rate becomes stable.

That is, the fluid transfer device 20 according to the present invention
The sewage pumping flow rate at zero adjusts the air supply amount.
The first transfer amount adjusting mechanism controlled by the
This is performed by a second transfer amount adjusting mechanism that adjusts the transfer amount to the second anaerobic filter bed tank 6 by changing the height of the filter bed.

The sewage flowing into the second anaerobic filter bed tank 6 at a constant flow rate is further anaerobically treated, then transferred to the aerobic filter bed tank 7 for aerobic treatment, and further passed through the treated water tank 8 to the disinfection tank 9. It is sterilized and discharged from the outlet 4.

In the fluid transfer device shown in FIG. 5, the length of the return weir 210 in the return and advancing pipe 20 connected to the air lift cheese is set to be long, and the advection connected to the return weir 210 is increased. The pipe 23 is provided on the same plane as the return weir 210 and parallel to the return and advection pipe 20. With this configuration, when a large amount of sewage is pumped up and flows into the return and advection pipe 20, it can be returned while passing through the long return weir 210, and the installation location of the device is not specified.

As described above, this fluid transfer device
And a septic tank, a first fluid adjusting and transferring means (mechanism) for adjusting a transfer amount of sewage by an amount of air supplied to a pumping pipe, or a second fluid transferring means (mechanism) for adjusting by moving a dive weir
Can be quantified by one or a combination of both.

Such a fluid transfer device does not need to be specially considered at an installation place because its size is not much different from a conventionally used fluid transfer device. There is no need for a new air source because it is smaller than that of the adjusting basin type. Therefore, it is possible to directly attach to the conventional sewage purification tank, and the attachment position is not limited to the advection part from the first anaerobic filter bed tank to the second anaerobic filter bed tank, but also takes into account the flow control capacity and arrangement. It can be installed in another advection section, and can be installed later in a sewage purification tank without a flow rate adjusting function.

[0032]

According to the present invention, the liquid transfer speed (quantitative)
However, the structure is simple, the number of parts and the number of assembling steps are small, and it can be provided economically. In addition, since it is compact, there are few restrictions on the installation location. Further, the present invention can efficiently and stably treat sewage.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a sewage purification tank of the present invention.

FIG. 2 is a schematic sectional view of a fluid transfer device (air lift pump) of the present invention.

FIG. 3 is a perspective view of a main part of the air lift pump of the present invention.

FIG. 4 is an explanatory perspective view of a return and advection pipe of the present invention.

FIG. 5 is a perspective view showing another embodiment of the return and advection pipe of the present invention.

FIG. 6 is a schematic sectional view of a conventional sewage purification tank.

FIG. 7 is a schematic sectional view of a conventional air lift pump.

[Explanation of symbols]

 1, 100 sewage purification tank 2 partition 3 inflow port 4 outflow port 5 first anaerobic filter bed tank 6 second anaerobic filter bed tank 7 aerobic filter bed tank 8 treatment water tank 9 disinfection tank 10, 200 fluid transfer device (air lift pump) 11 , 200A, 200B Pumping pipe 12, 211 Opening of pumping pipe 16, 25 Air lift cheese 13, 27 Air pipe 18, 28 Adjusting valve 20 Return and advection pipe 21, 210 Return weir part 22 Submerged weir 23 Advection pipe 29 Supply air pipe 200C U-tube 220 Hook 225 Scale 230 Advection 270 Fume

Claims (9)

[Claims] 1. A pumping pipe for pumping fluid from a transfer source,
An air pipe arranged to discharge air inside the pumping pipe; and an advection pipe connected to the pumping pipe for transferring the pumped fluid to the transfer destination, wherein the pumping amount of the fluid in the pumping pipe is first. The amount of air supplied to the pumping pipe is adjusted by the fluid transfer amount adjusting means, and the amount of fluid transferred to the transfer destination is adjusted by the second fluid transfer amount adjusting means. The fluid transfer device is configured to be adjusted by the following. 2. The fluid transfer device according to claim 1, wherein the first fluid transfer amount adjusting means is an adjustment valve disposed in an air pipe. 3. The fluid transfer device according to claim 1, wherein the second fluid transfer amount adjusting means is a dive weir provided at an opening of the advection pipe and capable of changing a height of the weir. 4. The fluid transfer device according to claim 1, wherein the second fluid transfer amount adjusting means is a return weir that returns a fluid formed by cutting off a part of the advection pipe to a transfer source. 5. A method according to claim 1, wherein the inside of the tank is formed into a plurality of fluid storage tanks, and an air pipe capable of discharging air is installed in a pumping pipe opened in the fluid storage tank to discharge air into the pumping pipe. A sewage purifying tank configured to transfer a fluid from a transfer source tank to a next tank by disposing a fluid transfer device that lowers the apparent specific gravity of the fluid in the pumping pipe to pump up the fluid, An advection pipe for transferring the pumped fluid to the next tank is provided above the pumping pipe, and the pumping rate of the fluid in the pumping pipe is adjusted by first fluid transfer rate adjusting means for adjusting the supply rate of air from the air pipe. A sewage treatment tank configured to adjust the amount of fluid transferred to the next tank by a second fluid transfer adjusting means for adjusting the opening area of the transfer pipe. 6. The sewage treatment tank according to claim 5, wherein the pumping pipe of the fluid transfer device is disposed so as to open on the same plane as the low water surface of the fluid storage tank or at a position slightly lower than the water surface. 7. The septic tank according to claim 5, wherein the first fluid transfer amount adjusting means of the pumping pipe is an air adjusting valve provided in the air pipe. 8. The septic tank according to claim 5, wherein the second fluid transfer amount adjusting means of the transfer pipe is a dive weir provided at an opening of the advection pipe and capable of changing a height of the weir. 9. The septic tank according to claim 5, wherein the second fluid transfer amount adjusting means is a return weir that returns a fluid formed by cutting out a part of the transfer pipe into a fluid storage tank provided in the apparatus.