JP2002205095A - Sludge transporting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sludge transporting apparatus, in which the clogging of a diffuser is prevented and failure hardly occurs. SOLUTION: The sludge transporting apparatus has a sludge transporting pipe 3 dipped in a vessel, arranged in a horizontal direction and communicating with a blower 6 at the base end side, plural sludge suction pipes 4 communicating with the sludge transporting pipe 3 and formed so that each tip part extended on both sides of the sludge transporting pipe 3 is opened at the lower position of the sludge transporting pipe 3 as a sludge suction port 5, a sludge discharge pipe 7 communicating with the tip part side of the sludge transporting pipe 3 at one end and opened at another end as a discharge port 9 to the outside and a discharge valve 10 provided in the sludge discharge pipe 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge transfer apparatus, and more particularly to a technique for transferring a mixed liquid in a tank or excess sludge in a membrane separation activated sludge method or the like.

[0002]

2. Description of the Related Art Conventionally, a sewage treatment facility has a pretreatment tank, a flow control tank, a denitrification tank, a nitrification tank, a treatment water tank, and the like as separate tanks for each function. For example, an aeration device and a sewage transfer pump are installed. For example, a liquid mixture in a tank of a denitrification tank is supplied to a nitrification tank by a pump, or a liquid mixture in a tank of a nitrification tank is returned to a denitrification tank by a pump.

In the membrane separation activation method, a membrane separation device is immersed in a nitrification tank, air is diffused from an air diffuser arranged below the membrane separation device, and a solid-gas-liquid mixture generated by an air lift action of the air. The membrane surface is washed by upward flow.

[0004]

However, in the above configuration, if the transfer pump or the air diffuser breaks down, it will malfunction, so it is necessary to prevent the breakdown by regular maintenance.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a sludge transfer device which prevents the air diffuser from being obstructed, and has a simple structure with few mechanical components, so that it is difficult to cause a failure. The purpose is to provide.

[0006]

According to a first aspect of the present invention, there is provided a sludge transfer device according to the present invention, wherein the sludge transfer device is immersed in a tank and arranged in a horizontal direction, and has a base end communicating with an air supply source. And a sludge transfer pipe having a plurality of sludge suction ports on the lower surface, and one end communicating with the tip side of the sludge transfer pipe,
It has a sludge discharge pipe whose other end opens as a discharge port outside the tank, and a discharge valve provided on the sludge discharge pipe.

[0007] With the above configuration, at the time of sludge transfer, the discharge valve is opened while supplying air at a predetermined pressure from the air source to the sludge transfer pipe, and the air supplied to the sludge transfer pipe is discharged from the discharge port through the sludge discharge pipe. Discharge.

[0008] At this time, since the discharge port is opened at a position above the sludge transfer pipe and the sludge suction port is opened at a position below the sludge transfer pipe, the main flow of air flows toward the discharge port with lower resistance. Due to the pressure difference between the outside of the pipe and the vicinity of the sludge suction port due to the decrease in the static pressure inside the pipe, excess sludge or the mixed liquid in the tank flows into the sludge transfer pipe through the sludge suction port, and the mixed liquid in the tank together with air It is discharged from the discharge port through the sludge discharge pipe.

On the other hand, when the discharge valve is closed, air supplied at a predetermined pressure from the air source is blown into the tank through the sludge suction port of the sludge transfer pipe, and the mixed liquid remaining in the sludge transfer pipe is discharged outside the pipe. Is discharged to The air ejected from the sludge suction port acts as aeration air for aerating the mixed solution in the tank, so that there is no need to provide a separate air diffuser. Further, the diffused air dries the sludge in the vicinity of the sludge suction port and causes blockage. The dried sludge is washed when the sludge is transferred.

That is, when the sludge is transferred, the mixed liquid in the tank acts as a resistance to impede the air flow in the sludge transfer pipe, and the air flow pulsates, and the pressure in the sludge transfer pipe repeatedly changes rapidly. At the same time, the air and the mixture in the tank are intermittently discharged from the discharge port of the sludge discharge pipe, and the sludge intermittently flows into the sludge transfer pipe through the sludge suction port.

The sludge adhering to the inside of the sludge transfer pipe is effectively washed by the repetitive flow of the mixed liquid in the tank through the sludge suction port repeatedly. Sludge adhering to the inside of the sludge transfer pipe is dried by the air at the time of aeration, but the mixed solution in the tank infiltrates the sludge to promote sludge separation,
The separated sludge is discharged from the discharge port together with the mixed liquid in the tank with the discharge of air.

Therefore, the sludge suction port and the inside of the sludge transfer pipe can be washed when transferring the sludge, so that the obstruction due to the drying sludge can be prevented beforehand, and the special maintenance is performed by alternately performing the transfer of the sludge and the air diffusion. It is possible to always smoothly transfer and diffuse the sludge without the need for the above.

[0013] The sludge transfer device of the present invention according to claim 2 comprises:
The sludge transfer pipe is immersed in the tank and placed horizontally, and the base end communicates with the air supply source, and the sludge transfer pipe communicates with the sludge transfer pipe. A plurality of sludge suction pipes that open as sludge suction ports at positions, a sludge discharge pipe having one end communicating with the tip side of the sludge transfer pipe, and another end opening as a discharge port outside the tank, and a sludge discharge pipe are provided. And a discharge valve.

With the above configuration, when transferring sludge, the discharge valve is opened while supplying air of a predetermined pressure from the air source to the sludge transfer pipe, and the air supplied to the sludge transfer pipe is discharged from the discharge port through the sludge discharge pipe. Discharge.

At this time, the discharge port is opened at a position above the sludge transfer pipe, and the sludge suction port of the sludge suction pipe is opened at a position below the sludge transfer pipe, so that the main flow of air flow has a smaller resistance. The excess sludge or the mixed liquid in the tank flows into the sludge suction pipe and the sludge transfer pipe through the sludge suction port due to a pressure difference between the sludge suction port and the vicinity of the sludge suction port due to a decrease in the static pressure in the pipe. The mixed solution is discharged from the outlet through the sludge discharge pipe together with air.

Since the sludge suction pipe protrudes to both sides of the sludge transfer pipe, the sludge suction ports are widely dispersed in the tank.
Sludge settled at the bottom of the tank can be uniformly sucked over a wide range.

On the other hand, when the discharge valve is closed, air supplied from the air source at a predetermined pressure is blown into the tank through the sludge suction port of the sludge suction pipe, and the mixing in the tank remaining in the sludge transfer pipe and the sludge suction pipe is performed. The liquid is discharged out of the tube. The air spouted from the sludge suction port acts as aeration air to aerate the mixed liquid in the tank, and the sludge suction pipe protrudes to both sides of the sludge transfer pipe so that the sludge suction port is widely dispersed in the tank.
Uniform aeration can be performed over a wide range, and there is no need to provide a separate diffuser. Also, the sludge dries near the sludge suction port due to aeration and causes blockage,
The dried sludge is washed when transferring the sludge.

In other words, the liquid mixture in the tank acts as a resistance to impede the air flow in the sludge transfer pipe during sludge transfer, and the air flow pulsates and the pressure in the sludge transfer pipe repeatedly changes rapidly. In addition, the air and the mixture in the tank are intermittently discharged from the outlet of the sludge discharge pipe, and the sludge intermittently flows into the sludge suction pipe and the sludge transfer pipe through the sludge suction port.

The sludge adhering to the inside of the sludge suction pipe is effectively washed by the repetitive flow of the mixed liquid in the tank through the sludge suction port repeatedly. Sludge adhering to the inside of the sludge suction pipe is dried by the air at the time of aeration, but the mixed solution in the tank infiltrates the sludge to promote sludge separation,
The separated sludge is discharged from the discharge port together with the mixed liquid in the tank with the discharge of air.

Therefore, the sludge suction port, the sludge suction pipe, and the inside of the sludge transfer pipe can be washed during the transfer of the sludge, so that the obstruction due to the drying sludge can be prevented beforehand, and the transfer of the sludge and the air diffusion are performed alternately. Thus, the transfer and the air diffusion of the sludge can be always performed smoothly without requiring any special maintenance.

The sludge transfer device of the present invention according to claim 3 is
The sludge discharge pipe has, at the other end, an exhaust pipe branched via an exhaust valve separately from the discharge port, and the exhaust pipe opens as an exhaust port on the liquid surface in the tank or in the liquid.

With the above configuration, sludge transfer is performed by opening the discharge valve while the exhaust valve is closed,
Aeration is performed by closing the discharge valve and the exhaust valve, and only cleaning is performed by opening the exhaust valve with the discharge valve closed.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 to FIG. 4, a sludge transfer device 2 also serving as a diffuser and a membrane separation device 1 a disposed above the sludge transfer device 2 are immersed in a nitrification tank (aeration tank) 1. The membrane separation device 1a is not essential for the nitrification tank 1, but is used as a means for separating activated sludge in the membrane separation activated sludge method according to the present embodiment.

The membrane separation device 1a can use various types of separation membranes, for example, an organic flat membrane type, a tube type, and a ceramic type. Here, a plurality of membrane cartridges using the organic flat membrane type separation membrane are used. They are arranged in parallel in the vertical direction and at a predetermined interval, and form a flow path between adjacent membrane cartridges. Each membrane cartridge communicates with a membrane permeate flow path (not shown), and the water head (gravity) in the tank
Alternatively, it operates using the pump suction pressure as the driving pressure.

The sludge transfer device 2 includes a sludge transfer pipe 3 formed of a large-diameter pipe having a predetermined diameter disposed horizontally and a plurality of sludge suction pipes 4 formed of a small-diameter pipe having a predetermined diameter disposed below the sludge transfer pipe 3. Consists of The sludge suction pipe 4 has an inverted T-shape, communicates with the sludge transfer pipe 3 at one upper end, and has both ends protruding on both sides of the sludge transfer pipe 3 opening as sludge suction ports 5.

In this embodiment, the sludge suction pipe 4 is provided with the sludge suction port 5, but as shown in FIG.
It is also possible to provide the sludge suction port 5 directly on the lower surface of the. The sludge transfer pipe 3 has a blower 6 whose base end is an air supply source.
And a sludge discharge pipe 7 is connected to the tip side. The sludge discharge pipe 7 has an opening at the tip side as a discharge port 9 at a position above the sludge transfer pipe 3 inside a denitrification tank (or a sludge storage tank) 8, and a discharge valve 10 is provided in the middle. The sludge discharge pipe 7 is provided separately from the discharge port 9 with the exhaust valve 1
1, the exhaust pipe 12 is opened as an exhaust port 13 on the liquid level inside the nitrification tank 1. In the present embodiment, the exhaust port 13 is opened under atmospheric pressure above the water surface, but it is also possible to arrange the exhaust port 13 below the water surface.

The operation of the above configuration will be described below. At the time of sludge transfer, the discharge valve 10 is opened with the exhaust valve 11 closed, air of a predetermined pressure is supplied to the sludge transfer pipe 3 from the blower 6, and air supplied to the sludge transfer pipe 3 is passed through the sludge discharge pipe 7. It is discharged from the discharge port 9.

At this time, the discharge port 9 opens at a position above the sludge transfer pipe 7 and the sludge suction port 5 of the sludge suction pipe 4 opens at a position below the sludge transfer pipe 3, so that the flow of air is reduced. As shown in FIG. 3, the mixed liquid (or excess sludge) in the nitrification tank 1 passes through the sludge suction port 5 and the sludge suction pipe 4 and the sludge transfer as shown in FIG. 3 due to the pressure difference P0-P1. The mixed liquid in the tank which flows into the pipe 3 and flows into the pipe 3 is discharged to the denitrification tank 8 from the discharge port 9 through the sludge discharge pipe 7 together with air.

Since the sludge suction pipe 4 projects on both sides of the sludge transfer pipe 3, the sludge suction ports 5 are widely dispersed at the bottom of the nitrification tank 1, and the sludge settled at the bottom of the nitrification tank 1 is spread over a wide area. Can be inhaled uniformly.

On the other hand, the exhaust valve 10 and the exhaust valve 1
1 is closed, air supplied at a predetermined pressure from the blower 6 flows through the sludge suction port 5 of the sludge suction pipe 4 to the nitrification tank 1.
And the mixed liquid in the tank remaining in the sludge transfer pipe 3 and the sludge suction pipe 4 is discharged out of the pipe.

The air ejected from the sludge suction port 5 acts as aeration air for aerated the mixed solution in the tank, and the sludge suction pipe 4 projects to both sides of the sludge transfer pipe 3 so that the sludge suction port 5 is widened in the tank. Since they are dispersed, uniform aeration can be performed over a wide range, and there is no need to separately provide an air diffuser.

Further, the sludge dries near the sludge suction port 5 due to the aeration and causes a blockage. The dried sludge is washed when the sludge is transferred. In other words, the liquid mixture in the tank acts as a resistance to impede the ventilation of air inside the sludge transfer pipe 3 during the sludge transfer, and the air flow pulsates and the sludge transfer pipe 3
Since the internal pressure of the sludge repeatedly changes rapidly, air and the mixture in the tank are intermittently discharged from the discharge port 9 of the sludge discharge pipe 7, and the sludge suction pipe 4 and the sludge transfer through the sludge suction port 5. Sludge intermittently flows into the pipe 3.

The rapid inflow of the mixture in the tank through the sludge suction port 5 repeatedly causes the sludge adhering to the inside of the sludge suction pipe 4 to be effectively washed. The sludge adhering to the inside of the sludge suction pipe 4 is dried by air at the time of aeration, but the mixed liquid in the tank infiltrates the sludge to promote the separation of the sludge, and the separated sludge is mixed with the mixed liquid in the tank. The air is discharged from the discharge port 9 as the air is discharged.

Therefore, the sludge suction port 5,
Since the inside of the sludge suction pipe 4 and the sludge transfer pipe 3 can be washed,
Blockage due to drying sludge can be prevented beforehand, and sludge transfer and air diffusion are performed alternately, so that sludge transfer and air diffusion can be performed smoothly without any special maintenance, and the transfer function can be performed. Since it is realized with a simple structure, failures can be reduced and maintenance costs can be reduced.

If necessary, by opening the exhaust valve 11 with the discharge valve 10 closed, the mixed liquid in the tank sucked from the sludge suction port 5 is fed to the sludge suction pipe 4, the sludge transfer pipe 3, Nitrification tank 1 from exhaust port 13 through exhaust pipe 12
And only washing can be performed.

When operating from a remote place, a liquid level gauge is provided in the denitrification tank 8, and its displacement is detected through a communication line to confirm the presence or absence of sludge transfer. Avoid situations where transfer and flushing are not performed.

When automation is performed, each valve is an electric valve or a solenoid valve, and the opening and closing time is controlled by a timer or the like to set the amount of sludge to be transferred.

[0038]

As described above, according to the present invention, at the time of sludge transfer, the mixed liquid in the tank can be sucked and transferred through the sludge suction port, and the sludge suction pipe projects to both sides of the sludge transfer pipe and the sludge suction port. Is widely dispersed in the tank so that the sludge settled at the bottom of the tank can be sucked in uniformly over a wide range, and the mixed liquid in the tank is aerated with the air ejected from the sludge suction port with the discharge valve closed. It is not necessary to provide a separate air diffuser, and the inside of the pipe can be washed at the time of transferring the sludge. It can always be done smoothly.

[Brief description of the drawings]

FIG. 1 is a front view showing a sludge transfer device according to an embodiment of the present invention.

FIG. 2 is a perspective view of the sludge transfer device.

FIG. 3 is a sectional view of a main part of the sludge transfer device.

FIG. 4 is an enlarged view of a main part of the sludge transfer device.

FIG. 5 is an enlarged view of a main part of a sludge transfer device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nitrification tank (aeration tank) 1a Membrane separation apparatus 2 Sludge transfer apparatus 3 Sludge transfer pipe 4 Sludge suction pipe 5 Sludge suction port 6 Blower 7 Sludge discharge pipe 8 Denitrification tank (or sludge storage tank) 9 Discharge port 10 Discharge valve 11 Exhaust Valve 12 Exhaust pipe 13 Exhaust port

Continuation of the front page (72) Inventor Tatsuya Uejima 2-47 Shishizu Higashi, Namiwa-ku, Osaka-shi, Osaka F-term in Kubota Corporation (Reference) 4D028 BC11 BC24 BC26 4D029 AA01 AB07 DD01 4D059 AA04 CB01

Claims (3)

[Claims] 1. A sludge transfer pipe having a plurality of sludge suction ports on its lower surface and a bottom end communicating with an air supply source, and one end of the sludge transfer pipe being immersed in a tank and arranged horizontally. And a sludge discharge pipe having the other end open as a discharge port outside the tank, and a discharge valve provided on the sludge discharge pipe. 2. A sludge transfer pipe having a base end side communicating with an air supply source and a sludge transfer pipe communicating with the sludge transfer pipe, and each end projecting to both sides of the sludge transfer pipe. A plurality of sludge suction pipes that open as sludge suction ports at a position below the sludge transfer pipe, a sludge discharge pipe having one end communicating with the tip side of the sludge transfer pipe, and the other end opening as a discharge port outside the tank; A sludge transfer device comprising: a discharge valve provided in a discharge pipe. 3. The sludge discharge pipe has, at the other end, an exhaust pipe branched via an exhaust valve separately from the discharge port, and the exhaust pipe is opened as an exhaust port on the liquid surface in the tank or in the liquid. The sludge transfer device according to claim 1 or 2, wherein: