JPH06320181A - Sludge transfer device for combined treating septic tank - Google Patents

Abstract

PURPOSE:To provide a sludge transfer device, for combined treating septic tank, which prevents pulsation of the water being transferred and can easily adjust the amt. of sludge transferred with a relatively simple structure and which is easy to maintain and inspect. CONSTITUTION:A branch pipe 21 is connected to the upper end of a water lifting pipe 16 leading to a contact aeration tank to provide a division into two branching directions and a pipe arrangement is made in such a manner that the end of one branch is positioned at the upper part of a first chamber of an anaerobic filter bed tank and the end of the other branch is positioned at the interior upper part of the contact aeration tank. An opening part 27a is formed on the upper side of an intermediate part of a first pipe 22 leading from the branch pipe to the upper part of the first chamber of the anaerobic filter bed tank, a rising part 27b is provided in the pipe below the opening part to suppress pulsation of the water being transferred for treatment and a flow meter 27c with V-shaped notch part is provided to measure the amt. of the water flowing over the rising part and toward the first chamber of the anaerobic filter bed tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge transfer device for a combined treatment septic tank for treating domestic wastewater discharged from a kitchen, bathroom, washroom, etc. of a home and human waste discharged from a flush toilet. .

[0002]

2. Description of the Related Art Domestic wastewater and night soil discharged from homes are said to be a major cause of pollution of rivers and lakes. As a small septic tank installed at home for the purpose of preventing pollution of rivers and lakes due to such domestic wastewater, a single septic tank that treats only human excrement discharged from flush toilets separately, and human waste and household waste. There is a combined treatment septic tank that treats both wastewater together, but the latter combined treatment septic tank is preferable from the viewpoint of preventing pollution of rivers and the like.

There are various types of combined treatment septic tanks, such as those using the anaerobic filter bed contact aeration method and those using the separation contact aeration method. Here, as an example, the anaerobic filter bed contact aeration method is used. Describe things.

This has a septic tank main body to which an inflow pipe and an outflow pipe are connected, respectively, in the upper part of the opposite wall surfaces, and the inside of this main body is directed from the upstream side (inflow pipe side) to the downstream side (outflow pipe side). A plurality of treatment tanks are formed by sequentially partitioning with walls, and an opening is formed at a predetermined position of each partition wall so that the treated water can pass through these treatment tanks in sequence so that adjacent treatment tanks communicate with each other. Is.

Each treatment tank is called an anaerobic filter bed tank (a precipitation separation tank may be provided on the upstream side in some cases), a contact aeration tank, and a precipitation tank in order from the one located upstream.
The anaerobic filter tank has a filter material on which anaerobic microorganisms adhere to the surface, and the contact aeration tank has a contact material on which aerobic microorganisms adhere to the surface, and air is blown into the contact aeration tank from an external blower. A supply air diffuser and a disinfection tank are provided above the settling tank. Then, the sewage introduced into the main body of the septic tank through the inflow pipe is first anaerobically treated in the anaerobic filter bed tank, and then aerated in the contact aeration tank to purify it, and then the separated sludge is settled in the sedimentation tank. Separate from the supernatant,
The supernatant liquid is disinfected in a disinfection tank and then discharged to the outside through an outflow pipe.

In such a combined treatment septic tank, the sludge (biological film) adhering to the surface of the contact material of the contact aeration tank thickens when the use period becomes long, and the flow path in the contact material becomes clogged. As a result, the contact efficiency between the biofilm and the water in the tank is reduced and the treatment performance is deteriorated. Therefore, the backwashing work is performed regularly (for example, once every 6 months) for the purpose of recovering it. This is because air bubbles are emitted from an air diffuser (backwashing device) called a backwash pipe provided at the bottom of the contact material to separate the sludge from the surface of the contact material. It is pumped up by an air lift pump consisting of an air supply pipe with an air amount adjusting valve for supplying air and transferred to an anaerobic filter tank through a sludge transfer pipe.

Further, recently, in order to further improve the water quality performance, the above-mentioned air lift pump and sludge transfer pipe are used to transfer the treated water containing sludge in the contact aeration tank to the anaerobic filter tank at a constant ratio. It is advocated to always circulate it. This is because the nitrogen content in the organic matter is oxidized in the contact aeration tank to nitrite or nitrify it, and then they are transferred to an anaerobic filter bed tank, where they are converted into gaseous nitrogen by the action of denitrifying bacteria. It is intended to be converted to (N ₂ ) and scattered. According to this, it is possible to remove not only phosphorus but also nitrogen content which is a cause of malodor in drinking water due to factors such as algae in lakes and the like, and at the same time, removal of BOD (biochemical oxygen demand) source. Become.

By the way, from the contact aeration tank to the anaerobic filter bed tank or the precipitation separation tank (hereinafter, simply referred to as anaerobic filter bed tank)
The amount of treated water containing sludge to be transferred to, that is, the amount of sludge transferred needs to be appropriately adjusted as necessary so that it is large during backwash and small during circulation. However, as described above, since the treated water containing sludge is pumped up by the lift action of the air supplied to the pumping pipe and is transferred to the anaerobic filter tank through the sludge transfer pipe, the transfer water flowing in the transfer pipe is constantly Since pulsation is involved, the amount of transferred water is not constant as it is, and it is difficult to properly adjust the amount of water.

Therefore, in order to deal with such a problem,
In a conventional combined treatment septic tank, for example, Japanese Patent Laid-Open No. 4-7
As disclosed in Japanese Patent No. 1688 and Japanese Utility Model Laid-Open No. 3-86097, a means for adjusting a transfer water amount (sludge transfer amount) may be provided in the middle of the sludge transfer route.

Among them, the one disclosed in the former publication has a rectangular box-shaped metering device arranged on the upper part of a pumping pipe which constitutes an air lift pump, and two plate-like weirs are arranged inside the metering device. With a structure in which the weir is provided in parallel and detachably, and a V-shaped notch serving as a measuring unit is formed on the upper part of the weir,
Part of the treated water containing sludge pumped up into the metering device by the pumping pipe is transferred to the sedimentation separation tank over one weir, and the other part is transferred to the septic tank above the sedimentation tank over the other weir. It is transferred and the rest is returned to the pump tank. According to this, when the treated water pumped through the pumping pipe passes through the metering device, its pulsation is suppressed to some extent, and the transfer water can be adjusted by replacing the weir in the metering device as necessary. It will be possible.

In the latter publication, the gas-liquid separation chamber is formed in the upper part of the pumping pipe, the weir and the rectifying baffle are attached to the liquid outflow side of the gas-liquid separation chamber, and the gas is separated. A notch for keeping the water level of the treated water constant is provided on the opposite side of the liquid outflow portion of the liquid separation chamber. According to this, of the treated water pumped from the contact aeration tank into the gas-liquid separation chamber, the portion exceeding a certain water level is returned to the contact aeration tank through the notch, and the remaining treated water flows out. It is transferred to the anaerobic filter tank through a pipe, but at that time, the transferred treated water passes over the baffle and the weir,
The pulsation will be suppressed to some extent.

[0012]

However, according to the structure described in the former publication, since a relatively large box-shaped measuring device is provided above the pumping pipe, a large installation space commensurate with it is required. In that case, there is no problem as long as there is a sufficient empty space above the pumping pipe, but in actuality, in order to facilitate inspection work from the manhole of the septic tank main body, there are various Piping, valves,
In many cases, instruments are gathered. Therefore, it is difficult to secure an excessively large installation space, and even if the installation space can be installed, there is a problem that it becomes difficult to perform valve operation and maintenance inspection of other piping.

On the other hand, the latter publication may have a simpler structure and easier maintenance and inspection than the former one, but the baffle for rectification is provided in the gas-liquid separation chamber just above the pumping pipe. Since the water and the weir are arranged, when the water level in the gas-liquid separation chamber fluctuates due to pulsation, the treated water relatively easily crosses over the weir before the pulsation is sufficiently absorbed, and at the outflow pipe side. Because there is no flow meter,
There is a problem that it is difficult to adjust the flow rate.

The present invention addresses the above-mentioned problems in the conventional combined treatment septic tank, and the treated water containing sludge (transfer water) transferred from the contact aeration tank to the anaerobic filter bed tank or the precipitation separation tank. To provide a sludge transfer device for a combined treatment septic tank with a simple structure that can prevent the pulsation of the sludge and easily adjust the sludge transfer amount or the transfer water amount, requires a small installation space, and can easily perform maintenance inspection and management. To aim.

[0015]

To achieve the above object, a sludge transfer device according to the present invention comprises an anaerobic filter bed tank for anaerobic treatment of inflowing sewage or a sedimentation separation tank for sedimentation separation treatment, and its anaerobic or sedimentation separation. A contact aeration tank for aerobically treating the treated water, a pumping pipe for pumping the treated water in the contact aeration tank, and one end connected to the lower part of the pumping pipe to draw air from the blower inside the pumping pipe. And an air amount adjusting valve for adjusting the amount of air supplied into the pumping pipe through this pipe, and the treated water containing sludge in the aeration tank contacted by the pumping pipe. A combined treatment septic tank in which a part of the pumped water is transferred to an anaerobic filter tank or a precipitation separation tank is characterized by having the following configuration.

That is, a branch pipe is connected to the upper end of the pumping pipe to branch in two directions, and one end of the branch is on the upper side of the anaerobic filter bed or the precipitation separation treatment tank, and the other end. Are located in the upper part of the contact aeration tank. Then, an opening is formed on the upper side of the pipe in the middle of the pipe from the branch pipe to the upper part of the anaerobic filter bed or the precipitation separation layer, and the pulsation of the treated water to be transferred into the pipe below the opening. A suppressing weir and a flow meter having a V-shaped notch for measuring the flow rate of the treated water flowing over the weir toward the anaerobic filter bed or the precipitation separation layer are provided.

[0017]

In the sludge transfer device of the combined treatment septic tank configured as described above, the transfer amount of sludge or treated water from the contact aeration tank to the anaerobic filter bed tank or sedimentation separation tank is adjusted as follows. .

First, when air is supplied from the blower to the lower part of the pumping pipe provided in the contact aeration tank through the air blower,
The specific gravity of the treated water in the pumping pipe becomes lighter by the amount of bubbles of the supplied air, and the water level becomes higher than the water level in the contact aeration tank. Since such an air lift action becomes more remarkable as the amount of air supplied to the pumping pipe is increased, the pumping amount of the pumping pipe can be adjusted by the air amount adjusting valve of the air supply pipe.

Next, the treated water containing the sludge pumped up above the water level in the contact aeration tank is branched into two directions via a branch pipe connected to the upper part of the pumping pipe, and further connected to the branch pipe. Part of the gas is introduced to the upper part of the contact aeration tank through the piping provided and then returned to the contact aeration tank as needed, and the other part is introduced to the upper part of the anaerobic filter bed tank or sedimentation separation tank. Get burned.

Therefore, at the time of backwashing, the end of the pipe reaching the upper part of the contact aeration tank is closed by a lid or the like to prevent the treated water from returning to the contact aeration tank, so that the pumping pipe is All of the treated water including the sludge that has been pumped up will be transferred to the anaerobic filter bed tank or sedimentation tank.

On the other hand, during circulation, a part of the treated water containing sludge pumped up through the pumping pipe is returned to the contact aeration tank from the end of the pipe reaching the upper part of the contact aeration tank. A certain amount of the treated water is transferred to the anaerobic filter bed tank or the precipitation separation tank.

In that case, in the structure of the present invention, an opening is formed on the upper side of the pipe in the middle of the pipe from the branch pipe to the upper part of the anaerobic filter bed or the precipitation separation layer, and inside the pipe below the opening. Since a weir and a flow meter having a V-shaped notch are provided in the, the treated water transferred from the branch pipe side to the anaerobic filter tank or the sedimentation separation tank, that is, the transfer water, first flows to the weir once. By hitting, the pulsation is suppressed and at the same time the momentum is weakened to some extent. As a result, the transfer water flowing downstream beyond the weir becomes a steady flow with relatively few pulsations.

Then, the transfer water close to this steady flow passes through the flow meter and is finally transferred to the anaerobic filter tank or the sedimentation separation tank. At that time, the flow meter is arranged below the opening. Therefore, the passing amount of the transferred water, that is, the transferred water amount can be easily known from the outside. Therefore, based on the transfer water amount measured in this way, the amount of sludge or treated water to be transferred to the anaerobic filter tank or the like can be easily adjusted by, for example, adjusting the pumping amount with the air adjustment valve. it can.

[0024]

EXAMPLES Examples of the present invention will be described below. 1 and 2 are a schematic plan view and a vertical sectional view showing the overall configuration of the combined treatment septic tank in this embodiment.

As shown in these drawings, in the combined treatment septic tank 1, an inflow pipe 2 and an outflow pipe 3 are provided at the upper portions of the upstream (left side in the drawing) and downstream (right side in the drawing) wall surfaces facing each other. Each has a septic tank body 4 connected thereto.

The inside of the septic tank main body 4 except the upper portion is provided in order from the upstream side to the downstream side.
The anaerobic filter bed first chamber 5, the anaerobic filter bed second chamber 6, the contact aeration tank 7, and the precipitation tank 8 are partitioned by the second and third partition walls 4a, 4b, and 4c. Then, the anaerobic filter bed first chamber 5 and the second chamber 6 are communicated with each other through a communication port 4a ′ provided on the upper part of the first partition wall 4a, and the second partition wall 4b.
The anaerobic filter bed second through the communication port 4b provided in the upper part of the
The chamber 6 and the contact aeration tank 7 are communicated with each other, and the contact aeration tank 7 and the settling tank 8 are communicated with each other via a communication portion 4c ′ provided under the third partition wall 4c.

In the anaerobic filter bed first chamber 5 and the second chamber 6,
Filter media 9, 1 on the surface of which anaerobic microorganisms are formed, respectively
No. 0 is provided, and the tubular portions 5a and 6a of the rectangular tubular shape that also serve as the flow path of the treated water and the cleaning hole are the first partition wall 4a.
And it is formed along the 2nd partition wall 4b. Then, the sewage that has flowed into the first chamber 5 through the inflow pipe 2 is anaerobically treated by the anaerobic microorganisms generated on the surface of the filter medium 9 in the same chamber, and then the first partition wall 4a side cylinder. After flowing into the second chamber 6 through the portion 5a and the communication port 4a ', the anaerobic treatment is performed again in the second chamber 6 by the filter medium 10 in the same chamber, and then the cylinder on the second partition wall 4b' side. It is adapted to flow into the contact aeration tank 7 side through the portion 6a and the communication port 4b '.

On the other hand, in the contact aeration tank 7, the contact material 11 having aerobic microorganisms adhered to the surface thereof and the air supplied from a blower (not shown) separately provided outside the main body of the purification tank are used to enter the inside of the tank 7. An air diffuser 12 for producing an aeration swirl flow and a backwash device 13 composed of an air diffuser for backwashing are provided, and a rectangular tubular portion 7a also serving as a flow path for the treated water and a cleaning hole. Are formed along the second partition wall 4b. Then, the treated water that has flowed into the contact aeration tank 7 from the side of the second chamber 6 of the anaerobic filter bed is placed on the contact material 11 along the aeration swirl flow in the tank.
Repeated aeration circulation while being agitated between the two, and in the process, it is aerated by the action of the biofilm on the contact material surface,
After that, it flows into the settling tank 8 through the communication portion 4c ′ below the third partition wall 4c.

Further, the settling tank 8 is provided with a disinfecting tank 14 having a medicine cylinder 14a, an overflow weir 14b, and the like at its upper part. Then, the treated water that has flowed in from the contact aeration tank 7 side is separated into the supernatant water and the separated sludge in the settling tank 8, and the treated water that has flowed into the disinfection tank 14 beyond the overflow weir 14 in the supernatant water. Is sterilized by chemicals and then discharged to the outside through the outflow pipe 3, while the separated sludge settled on the inclined bottom of the settling tank 8 is returned to the contact aeration tank 7 for further processing. There is.

Further, in the combined treatment septic tank 1, as a means for further improving the water quality performance of the treated water, the air lift pump 15 for pumping the treated water containing sludge in the contact aeration tank 7 and the sludge pumped up. A sludge transfer device 20, which is a characteristic part of the present invention, for transferring the treated water contained therein to the anaerobic filter bed first chamber 5 is provided.

The air lift pump 15 has a pumping pipe 16 whose upper end is held at a height higher than the water level of the contact aeration tank 7 and whose lower end opening 16a is arranged near the tank bottom.
And an air pipe 1 having one end connected to the lower portion of the pumping pipe 16.
7, an air adjusting valve 18 for adjusting the amount of air, which is, for example, a needle valve, is provided on the air inflow side of the air supply pipe 17. Then, the water level in the pumping pipe 16 is raised by the lift action of the air supplied from the blower to the lower part of the pumping pipe 16 via the blower pipe 17, whereby the treated water containing sludge in the contact aeration tank 7 is raised. Is pumped up from the lower end opening 16a of the pumping pipe 16 to the upper end and supplied to the sludge transfer device 20.

On the other hand, the sludge transfer device 20, which is a characteristic part of the present invention, has a branch pipe 21 made of cheese that is connected to the upper end of the pumping pipe 16 to branch the pipe line in two directions, and one of the branched pipes 21. The first for sludge transfer, in which the base end is connected to the pipe end and the end is located above the water level in the anaerobic filter bed first chamber 5.
It has a pipe 22 and a second pipe 23 for return, which is connected to the other pipe end of the branch pipe 21 and whose tip is located above the water level of the contact aeration tank 7.

Of these, the first pipe 22 is, as enlarged and shown in FIGS. 3 to 5, the first straight pipe 24, the elbow 25, the first different diameter socket 26, and the second straight pipe in order from the base end side. 27, second
This is a configuration in which the different diameter socket 28 and the sludge transfer pipe 29 are connected. Of these, the second straight pipe 2 having a relatively large pipe diameter
An opening 27a is formed on the upper side of 7 so that the inside of the pipe can be seen from the outside, and a weir 27b and a flow meter 27c are provided in the pipe below the opening 27a.

The weir 27b has an upper surface formed substantially horizontally, and when the treated water being transferred passes through the inside of the second straight pipe 27, hits the weir 27b and overcomes the weir 27b, and then reaches the downstream side. By flowing, the momentum and pulsation are suppressed.

Further, the flow meter 27c is notched in a V shape on the upper surface side, and from the opening angle of the notch portion 27c 'and the height from the bottom portion, according to a previously determined empirical formula,
It is designed so that the flow rate of treated water passing therethrough can be roughly estimated, and a scale is attached in the height direction.
Then, when the treated water that has passed over the weir 27b flows in the direction of the sludge transfer pipe 29 through the flow meter 27c, the flow rate of the treated water, that is, the approximate value of the transferred water amount is known by reading the scale of the flow meter 27c. Is able to.

Further, in this embodiment, in particular, the first straight pipe 2
An elbow 25 is arranged between the first and second sockets 4 having different diameters, and an opening 25a is formed in an outer portion of the bent portion of the elbow 25. This is because the transferred treated water (including sludge) is applied to the bent portion of the elbow 25 to reduce the fluctuation of the flow velocity thereof, and the treated water thus hits the elbow 25 and changes the direction of the flow in a right angle direction. At this time, a part of the air flow is made to flow out from the opening 25a to suppress the pulsating flow by the air lift pump 15 to keep the amount of transferred water constant.

On the other hand, the second pipe 23 is composed of a straight pipe 30 connected to the branch pipe 21 and a return elbow 31 rotatably connected to the tip of the straight pipe 30.
By rotating the return elbow 31 with respect to the central axis of the straight pipe 30, the direction of the tip opening 31a of the elbow 31, that is, the mounting angle of the elbow 31, can be freely changed around the axis. Has become. The return elbow 31 has a lid (not shown) that can be attached to the tip opening 31a, and if necessary, for example, a screw-in type or a pin or a key may be attached so as not to fall off due to the force of the transfer water. By being inserted, the straight pipe 30 is prevented from falling off.

Here, in the branch pipe 21 of the illustrated example, the treated water is directed toward one of the two branching sides (hereinafter, this direction is referred to as the main flow direction of the branching pipe 21) rather than the other side. In order to make it easier to flow, the inflow side pipe part is connected to the branch side pipe part in a curved shape, but a structure in which it is connected in a T shape like normal cheese may be adopted. Of course.

Next, the operation of the above embodiment will be described. Sewage discharged from the household is first introduced into the anaerobic filter bed first chamber 5 in the septic tank body 4 through the inflow pipe 2 of the combined treatment septic tank 1. Then, after passing through the filter medium 9 in the same chamber, it is anaerobically treated by the anaerobic microorganisms generated on its surface, and then the tubular portion 5a and the communication port 4a 'on the side of the first partition wall 4a.
Flow into the second chamber 6 through the above, and in the second chamber 6 as well, after the anaerobic treatment is performed again by the filter medium 10 in the same chamber,
It flows into the contact aeration tank 7 side through the cylindrical portion 6a on the second partition wall 4b side and the communication port 4b '.

Next, the treated water flowing into the contact aeration tank 7 repeats aeration circulation while being agitated between the contact materials 11 along the aeration swirl flow in the same tank, and in the process. Aeration is performed by the action of the biofilm on the surface of the contact material, and then flows into the settling tank 8 through the communication portion 4c ′ below the third partition wall 4c. Then, in the settling tank 8, the supernatant water and the separated sludge are separated, and the overflow weir 14 of the supernatant water is separated.
Treated water that has flowed into the disinfecting tank 14 having the medicine cylinder 14a beyond b is sterilized by the medicine and is then discharged to the outside through the outflow pipe 3, while the separation that has settled on the inclined bottom of the settling tank 8 is performed. The sludge returns to the contact aeration tank 7 again for processing.

By the way, in such a normal process, the air adjusting valve 18 provided on the air inflow side of the air supply pipe 17 in the contact aeration tank 7 is closed, but the backwashing work and the circulation process are performed. In this case, it is necessary to transfer the sludge separated from the contact material 11 in the contact aeration tank 7 to the first chamber 5 of the anaerobic filter bed tank for denitrification treatment by the microorganisms in the same chamber and the second chamber 6. , The air adjusting valve 18 is opened to supply air to the pumping pipe 16, and the air lift action causes the treated water containing the separated sludge in the contact aeration tank 7 to be pumped up.
To the sludge transfer device 20 connected to the upper end of the.

In this case, at the time of backwashing, the elbow 31 in the second pipe 23 is directed upward as shown by the chain line in FIG. 3, and the tip opening 31a is covered with a lid (not shown). Then, the supply of air to the diffuser pipe 12 in the contact aeration tank 7 is stopped, and a large amount of air is supplied to the pumping pipe 16 via the air supply pipe 17. In this way, pumping pipe 1
The treated water containing sludge pumped through 6 does not return to the contact aeration tank 7, and all (for example, 50 to 100 liters / minute) passes through the second pipe 22 to the anaerobic filter tank first chamber 5. Will be transferred.

On the other hand, at the time of circulation, as shown by the solid line in FIG.
Do not cover a. Further, the air adjusting valve 18 is throttled so that the amount of pumped water becomes small, and air is supplied to the diffuser pipe 12 in the contact aeration tank 7 to generate an aeration swirl flow. By doing so, the treated water containing the sludge pumped up through the pumping pipe 16 will not flow into the branch pipe 21.
Is branched in two directions, and a part of it is returned to the contact aeration tank 7 via the elbow 31, and the rest is transferred to the anaerobic filter tank first chamber 5 through the second pipe 22.

At this time, in order not to cause a problem such as a short circuit,
The treated water must be supplied to the anaerobic filter bed tank 5 at a constant rate, and in order to do so, it is necessary to know the flow rate of the treated water flowing through the second pipe 22. It is difficult to estimate the flow rate as it is because the treated water pumped up to is accompanied by pulsation by the air lift pump 15.

However, in the sludge transfer device 20 of this embodiment, the elbow 25 is provided in the second pipe 22, the opening 25a is formed in the outer portion of the bent portion, and further downstream thereof. An opening 27a is formed on the upper side of the second straight pipe 27 having a relatively large diameter, and a weir 27b and a V-shaped notch 27 are formed in the pipe below the opening 27a.
and a flow meter 27c having c '.

Therefore, the treated water (transferred water) sent from the side of the branch pipe 21 into the second pipe 22 first hits the bent portion of the elbow 25 to reduce the fluctuation of the flow velocity, and at the same time, part of the treated water is transferred. The flow direction is changed in the perpendicular direction while flowing out from the opening 25a of the bent portion to the outside. As a result, the pulsation of the treated water is suppressed to a certain extent, and the flow path is expanded through the first socket of different diameter 26 on the downstream side to the second side.
The straight pipe 27 is reached. Also in the second straight pipe 27, the pulsation and the momentum are further suppressed by hitting the weir 27b below the opening 27a, so that the treated water that has passed over the weir 27b is close to a steady flow with relatively little pulsation. In this state, it passes through the flowmeter 27c on the downstream side.

At this time, the flow meter 27c is arranged below the opening 27a and is graduated in the height direction so that the water level of the treated water passing through the V-shaped notch 27c 'can be seen. From this, by visually reading the scale from the outside, it is possible to easily know the flow rate of the treated water at that time, that is, the approximate value of the transferred water amount. Therefore, based on the transfer water amount read in this way, for example, by adjusting the pumping amount by the air adjusting valve 18, the anaerobic filter tank first chamber 5 and the contact aeration tank 7 have a constant ratio ( For example, 1 to 5 l / min) of treated water can be circulated.

The combined treatment septic tank 1 according to this embodiment
Is an anaerobic filter contact aeration system having a first chamber 5 and a second chamber 6 as an anaerobic filter bed, but the application of the present invention is limited to such type of combined treatment septic tank. is not. For example, those that do not have an anaerobic filter bed or have only one room, those that use a separation contact aeration system that has a precipitation separation tank in place of the anaerobic filter bed, and that are adjacent to the anaerobic bed tank and that upstream. It can be applied to various types of combined treatment septic tanks such as a side with a sedimentation separation tank.

[0049]

As described above, according to the present invention, the sludge of the combined treatment septic tank in which a part of the treated water containing the sludge in the contact aeration tank is pumped up and transferred to the anaerobic filter tank or the like. In the transfer device, the pulsation of the treated water containing the sludge, that is, the pulsation of the transfer water can be effectively prevented, so that the flow rate measurement of the transfer water and the flow rate adjustment based thereon can be easily performed.

Moreover, as a means for preventing the pulsation and measuring the flow rate, an opening is formed in the middle of the pipe from the branch pipe to the anaerobic filter tank, and a weir and V-shape are formed in the pipe below the pipe. Since only a simple flow meter having a notch is provided, maintenance and inspection can be easily performed with a relatively simple structure.

Further, since it is not necessary to separately provide a box-shaped flow meter as in the conventional case, a large installation space is not required around the upper part of the pumping pipe where a relatively large number of valves and the like are gathered.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing the overall configuration of a combined treatment septic tank according to an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view of the septic tank.

FIG. 3 is a view showing a sludge transfer device provided in the septic tank.
Side view from the right side

FIG. 4 is a partial plan view showing a part of the sludge transfer device.

FIG. 5 is a partial front view showing a cutaway part of the sludge transfer device.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a sectional view taken along line BB in FIG.

[Explanation of symbols]

1 ... Merged treatment septic tank body 5, 6 ... Anaerobic filter bed tank (5 ... 1st chamber, 6 ... 2nd chamber) 16 ... Pumping pipe 17 ... Air supply pipe 18 ... -Air amount adjusting valve 20 ... Sludge transfer device 21 ... Branch pipe 22 ... Piping (first piping) 27a ... Opening portion 27b ... Weir 27c ... Flowmeter 27c '... V-shaped notch

Claims (1)

[Claims] 1. An anaerobic filter bed tank for anaerobically treating inflowing wastewater or a sedimentation separation tank for sedimentation separation treatment, and a contact aeration tank for aerobically treating the treated water that has undergone anaerobic or sedimentation separation treatment.
A pumping pipe for pumping the treated water in the contact aeration tank, an air supply pipe with one end connected to the lower part of the pumping pipe to supply air from the blower into the pumping pipe, and a pumping pipe through the air supply pipe into the pumping pipe. It has an air amount adjustment valve that adjusts the amount of air supplied, and a portion of the treated water containing sludge in the contact aeration tank is pumped by the above-mentioned pumping pipe and transferred to the anaerobic filter tank or sedimentation separation tank. In the sludge transfer device of the combined treatment septic tank, the upper end of the pumping pipe is branched into two directions via a branch pipe, and one end of the branch is an anaerobic filter tank or a sedimentation tank. In the upper part of the separation treatment tank, the other end is arranged so that it is located in the upper part of the contact aeration tank, and the pipe from the branch pipe to the upper part of the anaerobic filter bed tank or the sedimentation separation layer. An opening is formed on the upper side of the pipe in the middle, and below the opening. With a weir that suppresses the pulsation of the transferred treated water and a V-shaped notch that measures the flow rate of the treated water that flows over the weir toward the anaerobic filter bed or sedimentation separation layer A sludge transfer device for a combined treatment septic tank, which is provided with a meter.