JPS588390Y2 - Sludge extraction device with adjustable overflow - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sludge extraction device having an overflow top height adjusting member provided at the upper end of the sludge extraction pipe.

In sewage treatment equipment, sewage that has been treated with organic matter using activated sludge in an aeration tank is sent to a final settling tank, where it is separated into sludge and clear water, and the sludge settles at the bottom of the settling tank.

This settled sludge is extracted from the settling tank, and most of it is returned to the aeration tank for reuse.

In FIG. 1, 1 is a settling tank, and 2 is a sludge pool provided at one end of the bottom of the settling tank 1. The sludge settled on the bottom surface 1a of the settling tank is collected by a sludge scraper (not shown) into this sludge pool. 2
are collected in.

A sludge tank 3 is provided adjacent to the settling tank 1 via a partition wall 8, and the sludge stored in the sludge reservoir 2 is taken out to the sludge tank 3 by a sludge extraction device 5.

Reference numeral 4 denotes a pump for sending the sludge in the sludge tank 3 to the aeration tank, and a pump (not shown) for sending excess sludge to the sludge thickener is also provided.

By the way, the conventional sludge drawing device 5 has one end opened into the sludge tank 2, the other end of the drawing pipe 6 guided into the sludge tank 3 and extended upward, and a telescope valve 7 provided at the other end. The upper end of the movable tube body 7a is connected to the liquid level 9 of the settling tank 1.
The sludge in the sludge tank 2 is drawn into the sludge tank 3 by the difference in water level created by locating it further down.

However, the amount of sludge sent by the pump 4 needs to be changed in response to the constantly changing amount of sewage, and at the same time, the amount of sludge extracted by the sludge extraction device 5 also needs to follow the change in the amount of sludge sent. However, since the telescope valve 7 is manually adjusted, it cannot follow the flow, and therefore the amount of mud fed by the pump 4 may not be able to correspond to the amount of sewage.

The present invention eliminates such conventional drawbacks and provides a sludge extraction device that can automatically pull out an amount of sludge equal to the amount of sludge sent by the pump from a settling tank into a sludge tank, and that is easy to install. With the goal.

Examples thereof will be described below based on the drawings.

In FIG. 2, 11 is a drawn pipe, one end of which 11
A opens into the sludge reservoir 2 at the bottom of the settling tank 1, penetrates the partition wall 8, is guided into the sludge tank 3, and extends upward in the vertical direction, and the other end 11b opens above the liquid level 12 of the sludge tank 3. It has a protruding opening.

A ring 13 is fitted to the upper end 11c of the drawn pipe 11.

The ring 13 is connected to the upper end 11 of the drawn tube 11 as shown in FIG.
The height position can be adjusted by screwing and externally fitting onto the shaft and moving it in the direction of the helical axis, and it is tightened and fixed in a predetermined position by a locking nut 14.

15 is an upper end 11b of the upper end 11c of the drawn pipe 11 and the other end 11b
It is a cylindrical body whose top end is closed and which covers the outer periphery of the body in a sealed manner with a space 16 left in between, and its cross section is a square shown in FIG.

Cylindrical body 150 opposite side piece 17.18 to opposite side wall 19.2
0 is extended, and the lower end edge of this side wall 19.20 is a cylindrical body 1
A sloped bottom plate 21 connected to the lower edge of the side wall 1 is provided.
A side plate 22 reaching the bottom plate 21 is provided along the vertical edge of 9.20, and an overflow passage 23 is formed.

This passage 23 communicates with an opening 24 provided between the side walls 19, 20 at the lower end of the cylindrical body 15.

Since the side plate 22 is loosely fitted between the guide rails 25 and 26, it can be pulled upward, and if the passage 23 is clogged with sludge, it can be removed and cleaned.

- The head 15a of the force cylindrical body 15 is constructed so that it can be divided into upper and lower halves at the joint 15b, and when it is desired to adjust the height position of the ring 13, the head 15a can be easily removed and adjusted.

One end of a tube 27 passes through the upper end plate 15c of the cylindrical body 15 and communicates with the space 16 inside the cylindrical body 15, and one end of the housing tube 28 is immersed in the liquid level 12 for a predetermined length. Both pipes 27.2
The other end of 8 is connected to a pipe 29 connected to a pneumatic supply source (not shown).

Next, the effect will be explained.

Now, the tip of the ring 13 at the upper end 11c of the drawn pipe 11 is below the liquid level 9 of the settling tank 1, and the height difference is H.
It is assumed that the value is set to o.

The difference in height between one end of the old pipe 28 and the liquid level 12 of the sludge tank 3 happens to be H1, Hl is smaller than Ho by h, and furthermore, the pipe 29 has a pressure P that is appropriately higher than the head pressure of Hl. It is assumed that air is supplied.

Then, the pressure inside the tube 28 becomes the pressure P corresponding to the head H1.
1, and the pressure in the space 16 inside the cylindrical body 15 communicating with this tube 28 via the tube 27 is also Pl.

In this way, the sludge in the sludge reservoir 2 is discharged from the other end 11b of the drawing pipe due to the differential pressure between the pressure Po corresponding to the head Ho and the pressure P1.

Since the lower end of the cylindrical body 15 is closed, the sludge discharged into the cylindrical body 15 once accumulates in the cylindrical body 15 and is then transferred to the cylindrical body 1.
Due to the pressure Pl in the space 16 in the sludge tank 5, the sludge flows from the lower end opening 24 through the overflow passage 23 and overflows from the upper end opening 30 thereof and enters the sludge tank 3.

By the way, the head of the discharged sludge, that is, the upper end of the drawing pipe 11c
The difference in height between the ring 13 screwed on and the discharge liquid level is H.
o-Hl and is proportional to the amount of sludge withdrawn from the sludge sump 2.

Next, from this state, the amount of mud fed by the pump 4 increases and the liquid level becomes 1.
If 2 falls, Hl becomes smaller, so H8-Hl
, that is, h increases, and the amount of sludge extracted increases.

On the other hand, when the amount of sludge fed by the pump 4 decreases and the liquid level 12 rises, Hl increases, so h becomes smaller and the amount of sludge drawn decreases, and when Hl reaches HQ, the drawing stops.

In this way, even if the amount of sludge fed by the pump 4 changes, the sludge is drawn into the sludge tank 3 in accordance with the amount of sludge fed, and the liquid level 12 is maintained substantially constant.

Note that if the lower end opening 24 of the cylindrical body 15 is below the liquid level 12 (below Hl), the overflow passage 23 may not be provided and the sludge may be directly discharged from the lower end opening 24 into the sludge tank 3. You will get the same result as above.

However, in this case, since the discharged sludge is discharged below the liquid level 12 and in a downward direction, the condition of the discharged sludge cannot be visually observed, and the color of the sludge is used to determine the properties of the sludge. This is disadvantageous in that it is not possible to observe the amount of sludge discharged.

In this way, the height of the ring 13, that is, the height of the overflow top, is
The Ho is the most important factor in determining the discharge amount.

Therefore, for example, when installing several of these drawing devices and managing the whole in an integrated manner, if the height positions of the upper ends 11c of the individual drawn pipes 11 do not match due to installation errors, or for some reason the upper ends 11c positions may not match. If it changes, there will be a difference in the discharge amount, making management very difficult.

However, in the present invention, by removing the head 15a of the cylindrical body 15 and adjusting the height of the ring 13, the height of the overflow top can be easily adjusted to the normal height.

FIG. 5 shows another embodiment of the present invention, in which a drawn pipe 1
A weir plate 41 is provided at the upper end 11'c of 1'.

The weir plate 41 is connected to the drawn pipe 11 as shown in an enlarged view in FIG.
This notch 1 is formed by cutting a part of the upper end 11'c into a chevron shape.
2 is installed so as to close it from below.

Since the weir plate 41 is attached by passing bolts through the elongated holes 43, it is movable in the axial direction of the drawn pipe 11', and the height of the overflow crest can be adjusted.

Further, the cylindrical body 15' is constructed by fixing the bridge-shaped member 15'd to the drawn pipe 11', and the overflow passage 23' is formed by the bottomed 22'.
It is formed by fixing the bridge-shaped member 22' of 'a' to the bridge-shaped member 15'd.

Further, the head 15'a of the cylindrical body 15' is configured to be divided into upper and lower halves at the joint portion 15'b.

Therefore, if you want to adjust the height of the overflow crest, remove the head 15'a of the cylindrical body 15' as in the previous embodiment, and
The height of the overflow crest can be easily adjusted by moving up and down.

If the cylindrical body 15 is clogged with sludge and you wish to clean it, remove the side plate 22, close the valve 31, open the tip valve 32 of the branch pipe 27a of the pipe 27, and remove the cylindrical body 15.
If the inside is opened to atmospheric pressure and the sludge is vigorously discharged with a large pressure difference Po, the force of the discharged sludge can be used to clean the drawing pipe 11 together.

According to the present invention, as is clear from the above explanation, the liquid level in the sludge tank can always be kept constant regardless of changes in the amount of sludge sent by the pump, so the amount of sludge equal to the amount of sludge sent is automatically pumped out. It can be drawn from the sedimentation tank to the sludge tank.

In addition, the height of the overflow top of the sludge extraction pipe can be adjusted, so even if the height of the overflow top changes due to installation errors, it can be adjusted to the correct height, which is very convenient in terms of equipment installation and management. It's convenient.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the overall configuration of a settling tank together with a conventional sludge extraction device, and FIG. 2 is a sectional view showing an embodiment of the present invention.
Fig. 3 is a sectional view of the ring fitted to the upper end of the sludge drawing pipe, Fig. 4 is a sectional view of the cylindrical body, Fig. 5 is a sectional view showing another embodiment of the present invention, and Fig. 6 is a sectional view of the ring fitted to the upper end of the sludge drawing pipe. 6 is an enlarged cross-sectional view taken along line A-A in FIG. 5. FIG. 1...Sedimentation tank, 2...Sludge tank, 3...
...Sludge tank, 4...Pump, 11.11'
.....drawn pipe, 13.....ring, 14.
...Nut, 15.15'...Cylindrical body,
16...Space, 23, 23'...Overflow passage, 27.28.29...Pipe, 31-34.
...Valve, 41...Weir plate, 42...
...Notch.

Claims (1)

[Scope of utility model registration request] A drawn pipe with one end opening at the bottom of the sedimentation tank is guided into the sludge tank and the other end is extended upward, and an overflow height adjustment member is provided at the upper end of the drawn pipe so as to be movable in the axial direction. A cylindrical body with a closed top end that covers the upper part and outer periphery of the other end with a space left therein and can be divided into two upper and lower parts at the head, and connects the other end of the pipe and the sludge tank with one end communicating with the space inside the cylindrical body. A sludge extraction device capable of adjusting overflow, characterized in that a pipe having one end immersed in a liquid level and the other end of the pipe communicate with each other and are connected to a common fluid supply source.