JPS6271597A - Supernatant liquid withdrawing device - Google Patents

Abstract

PURPOSE:To withdraw supernatant liquid without disturbing a sludge boundary by using a supernatant liquid withdrawing pipe having a float. CONSTITUTION:A communicating device 2 which communicates the inside and outside of a tank 1 with each other is provided to a tank wall 1a. the float 3 and a discharge port 4 for the supernatant liquid are provided to the top end of the supernatant liquid withdrawing pipe 5 and the base end of the pipe is connected freely vertically turnably to the open end of the device 2 on the tank inside and is vertically oscillated as the liquid level rises or falls. A cord 18 connected to the pipe 5 is alternately wound on movable pulleys 13a, 13b and a stationary pulley 14 of a luffing device 6. A moving cylinder 10 which moves the movable pulleys apart from or near to the stationary pulley is provided to the movable pulleys. The pipe 5 is moved to raise or fall around the base end by the operation of the cylinder 10. As a result, the supernatant liquid is withdrawn without disturbing the sludge boundary; in addition, the construction of the device is simple and the ease of maintenance and operation is good.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention is directed to the treatment of sewage by repeating, for example, a cycle consisting of at least an aeration process, a sludge separation process, and a supernatant liquid withdrawal process in a single treatment tank. Batch biological treatment value +t
#c J6 relates to a supernatant liquid drawing device suitable for use in drawing out supernatant liquid.

``Prior art'' In conventional single-batch biological treatment equipment, the method of discharging the upper liquid d out of the tank is to use a floating pump or a submersible pump installed at the lower limit 1z of drawing the supernatant liquid in the treatment tank. It is being

However, with this method, there was a problem in that when the supernatant liquid was drawn out, the suction force of the pump disturbed the sludge interface, causing sludge to mix into the gauze liquid, resulting in a decrease in the liquid purchase rate of the supernatant liquid. . Therefore, in order to eliminate this drawback, it is better to install a supernatant liquid drawer w equipped with a float inside the processing tank, and let the supernatant liquid flow down naturally through the sound of this drawing and be discharged to the outside of the processing tank. Tea is served and it is widely used.

"Problems to be Solved by the Invention" By the way, when pulling out the upper casing using the above-mentioned drawing pipe,
In the aeration process and the static separation process of sludge, the extraction ′θ
is pulled upwards so that it comes out of its outlet or from the liquid surface, and at the start of nighttime extraction, it is lowered again and floated above the liquid surface. is performed by a motor with a speed reducer. However, when a motor is used, a device for switching between forward and reverse rotation is required, resulting in an expensive device and a complicated structure.

The present invention has been made in view of the above *1*, and by using a supernatant liquid drawing pipe equipped with a float, the upper 61 liquid can be drawn out without disturbing the sludge interface, and the structure is Supernatant liquid withdrawal f that is simple, easy to maintain, and has good operability
The purpose is to provide a location.

``Means for Solving the Problems'' In order to achieve the above objectives, the supernatant liquid drawing 9 of the present invention is directly connected to the inside and outside of the cypress tree so as to communicate with each other. A communication device is provided at the tip with a float and a drain port for the upper liquid, and the west end is connected to the open end inside the chamber of the upper flow device so that the liquid can be freely rotated up and down. The supernatant liquid is withdrawn from above and below, and the supernatant liquid is withdrawn from above.
A picture body connected to the fixed pulley is alternately wound around a movable I'it wheel and a fixed pulley, and a moving cylinder is attached to the movable pulley to move the movable pulley away from or approach the fixed pulley. and a lifting device for raising and lowering the above-mentioned upper lifting/retracting unit '1f centering on the Ti end.

"Function" The upper/f sash extractor of the present invention has 8 features: 1. By operating the movable cylinder of the start-up device and bringing the movable pulley close to the fixed pulley, the upper I&A drawer 1if is floated to the liquid surface, and the supernatant liquid is drawn out. Also.

When the supernatant liquid is not to be drawn, the movable cylinder is operated to separate the movable slide unit from the fixed pulley, so that the supernatant liquid drawing W is raised upward and stored.

Embodiment An example of an IM according to the present invention will be described below with reference to FIGS. 1 to 11.

1 in the figure is the treatment tank directly at the batch biological treatment fc, and this treatment @
1, a cycle consisting of raw wastewater reception, seven aeration processes, sludge static separation process, and sludge extraction process shown in Figure 9 is repeated.

This processing tank 1 is provided with an upper liquid extraction device A.

The above-mentioned supernatant liquid withdrawal crack dA is provided with a communication device 2 that is sunk in the tank wall 1a of the processing II 1 and communicates the inside and outside of the processing tank 1 with each other, and a float 3 and a withdrawal port 4 for the supernatant liquid at the tip. The base layer is connected to the above! The supernatant liquid drawing tube 5 is rotatably connected to the supernatant liquid drawing tube 112, and the lifting device 6 raises and lowers the supernatant liquid drawing tube f5.

The communication device 2 connects a fixed pipe a7 with a 90 degree bend y7b connected to the -im of the straight line 1#7a on the tank wall la of the processing pipe 1, so that the bent pipe 7b is inside the processing tank 1. The tank wall 1a' is fixed horizontally through 'A' so that the tank wall 1a' is positioned horizontally at y?
It has a structure in which a flow adjustment valve 8 is provided in one part.

In addition, the above-mentioned Kamisumi? The cash on delivery removal 5 is a straight pipe 5 of the required length.
45 degree bend at the tip of a'#5b? 1. The upper d5C with the upper d5 and the lower 4 are connected. , and 90 waves of bending, 7sct, are connected to the base layer of the above-mentioned straight ", l'5a, and the curved blue 5d of the base g, 1 is connected to the above-mentioned fixed g.
7 by a rotary joint 5f supported on the tank wall 1a via a bracket 5ei so as to be vertically rotatable. Then, a pair of left and right 4-jo plates 5g and 5g are fixedly attached to the fruit juice-1750, and
Above the fruit juice level 5C.

The float 3, which is formed by combining four pipes 3a, . Pipe 3a & Co1
It is divided into 4 parts by the C-separating axis 5h.

It is provided so as to be freely rotatable up and down with respect to the connecting plates 5g, 5g.

On the other hand, the above-mentioned tFII[i16 is formed of an angle material and is installed on the tank wall 1a of the processing tank 1 in a HIC-fixed manner. The air cylinder (movable cylinder) 10 is fixedly mounted with the air cylinder 10 facing the same direction, and a pair of diamond-shaped front pigs are fixed to the tip of the rod 10a of the air cylinder 10 via a connecting member 11't. A pair of left and right pT sliders IJa, which are rotated on the left and right of 12 with their axes ftM directed toward the front, and are rotatable in the same lead If plane.
13b, and the shaft 1M is attached to the support frame 9 so that it is located slightly below the extended end of the rod lOa of the air cylinder 10.
It is installed facing the front and back, and the top 6 pins! lJ Kiyoshisha 13a
.

Fixed end that can freely rotate in the same vertical plane as 13b*
14, it is wound from the left movable pulley 13a through the fixed pulley 4 to the right movable pulley 13b, and one end is connected to the supernatant liquid drawing mechanism 5). ! Ring shaft 5h simple 15
2, the other end of which is inserted into a guide f16 vertically provided on the lower surface of the support frame 9.
It consists of a wire rope (rope body) 18 connected to a wire rope 17. The cylinder body 10b of the air cylinder 10 includes a speed controller 19a;
Two air pipes 20a, 2Qb, each equipped with 19b
are connected to these two air pipes 20a.

20b is a four-way electromagnetic switching valve 23 connected to a compressed air source 22 by an air supply pipe 21; ! As shown in FIG. 1, the rod 1 (
1 is contracted and the movable pulleys 13a and 13b are raised to move them away from the fixed pulley 14 i'IaI5, while the electromagnetic switching valve 23 is switched as shown in FIG. 10 to reduce the pressure f! ! By supplying air from the upper air pipe 20& to the cylinder body 10b, the rod 10& is extended, and the movable pulleys 13a, 13b
can be lowered to approach the fixed pulley 14. Further, the support frame 9 for the guide tube 16 is
A stopper 24 made of a pipe with a smaller diameter than the trowel 17 or a member having a U-shaped cross section when viewed from above is provided at the joint with the trowel 17. This stopper 24 allows the stray 17 to be guided
It is designed to prevent it from coming out upwards from #16. moreover,
Inside the support pedestal 9, a pair of left and right angle members are arranged facing each other on the front and seven rear sides.
At the upper and lower parts of the connecting member 11, there are bookshelves 26a and 25a.
Guide wheels 26 and 26 each having wheels 26b and 26b are installed at both ends of the wheel so as to direct the axle load back and forth, and these guides 26 and 26 move up and down along the guide rails 25 and 25. It has become. In addition, movable pulleys 13a, 13 are provided at the upper part of the support frame 9.
When b reaches the rising end, for example, the left movable pulley 13
A limit switch 27 is attached to which 1 is in contact, and a signal from this limit switch 27 causes the next process of the supernatant liquid withdrawal process, that is, the raw wastewater or the above-mentioned treatment ai
A level switch 28 is attached to the tank wall 1 of the slide l for detecting when the level due to overlaying reaches the lower limit level LWL for drawing out the supernatant liquid. 11 from this level switch 28, the '46 valve 23 is placed in the position shown in FIG.

In the figure, 29 is a drainage ditch, B is settled sludge, f (WL is the upper limit level for drawing supernatant liquid, 31a and 31b are reverse valves installed on the snow that bypass the speed controllers 19a and 19b, respectively, and the air cylinder The compressed air supplied to the air cylinder 10 is prevented from passing through the bypass, while the air discharged from the air cylinder 10 is allowed to flow.

Next, the operation of the supernatant liquid drawing device +#A having the above structure will be explained.

When the upper excrement liquid is not drawn out, such as in the aeration process or the sludge placement process, the rod loa of the air cylinder lO is at the contracted end and the island 17 is locked with the stopper 24, as shown in Fig. 41. The wire rope 18 is erected upward so as to be about 150 to 20 Q lengths higher than the upper limit level HWL for pulling out the top crease of the tank 1.

When the supernatant liquid drawing process starts from this state and the supernatant liquid is to be drawn out, the air cylinder IO is extended and the supernatant liquid drawing unit 5 is brought down and floated above the liquid surface. . That is, by switching the electromagnetic switching valve 23 from the position shown in FIG. 1 to the position shown in FIG. 10, compressed air is supplied from the upper air pipe 20a to the cylinder wood 10b, and the rod 1 oat-nobu is made. Then, movable pulley 1
3a.

13b descends and approaches the fixed 1Iit vehicle 14, but at the extended end of the rod 10JI, there is an allowance in the length of the wire rope 18 that was holding the supernatant liquid extraction '1f5 upward. The clear liquid drawing pipe 5 is rotated downward at the rotary joint 5f and floated above the upper fg liquid plane. Also, at this time, the wire rope 18 is at its j1! 111i17 is provided in the section, so it will not loosen, but when the a side of the supernatant liquid is at the upper limit level HWL for drawing out the supernatant liquid, the y port (fi17 is lowered to the lower end of the guide rod 16 in Fig. 10). are doing.

When the supernatant liquid drawer 1 & 5 floats to the surface, the supernatant liquid flows in from the drain port 4 located slightly below the float 3, naturally flows down inside the supernatant liquid drawer tube 5, and then flows out from the fixed tube 7. Drainage proverb 2
It flows out to 9. Then, at the same time as the a side gradually lowers, the supernatant liquid drawing f5 follows it and gradually falls downward in the floating state, until the black plane in Fig. 11 is at the lower limit level for supernatant liquid drawing. LWL (Cd).Then, the level switch 28 detects this and the detection signal causes the electromagnetic switching valve 23 to switch again to the position shown in Fig. #5 is raised upward.In other words, when the four-magnetic cutting square 23 reaches the position shown in Figure E1, compressed air or air from the F side enters the cylinder body %10b from d20b and contracts the rod 10a. , As a result, the movable slides zt13a and 13b rise and the fixed slide RL14
However, as the movable pulleys 13a and 13b rise, the wire rope 18 is wound alternately around the OT pulleys 13a and 13b and the fixed 1'#Jg14. 18 is pulled up and first 817 hits the stopper 24.

When fi17 is locked by stopper 24 and cannot be raised any further, the supernatant liquid is pulled out - g5 is connected to wire rope 18t? Rotate upwards around the proximal end through the
As shown in FIG. 1, the robot returns to the standing state.

In this way, in the supernatant liquid drawing device having the above structure, the supernatant liquid drawing gear 5 is used, and the fixed f7 is provided at a portion below the supernatant liquid drawing lower limit level LWL of the processing tank l.
When the harvesting surface of the supernatant liquid is at or near the upper limit level HWL for supernatant liquid withdrawal, the pIt direction of the supernatant liquid and fixed - #7
As the head difference between the sludge and the sludge increases, the drawing flow rate increases (the drawing flow rate increases), and as the liquid level of the supernatant liquid decreases and gets closer to the sludge interface, the above head difference decreases and the drawing flow rate becomes smaller ( (The drawing flow rate becomes small).

Therefore, when the liquid gap approaches the sludge interface, the entrainment of sludge is eliminated and the quality of the supernatant liquid to be discharged is prevented from deteriorating, and at the same time, +il is reduced when withdrawing.

Furthermore, in the upper part #:, at the edge A of the pulling device.

Air cylinder 10. Town i1J slide table 13a, 13b, fixed slide! 14. Since the supernatant liquid withdrawal '1itS was raised and lowered by the raising and lowering device consisting of 18 wire ropes, etc., the purchase amount was reduced to 1llJ compared to the one using all the motors of the rice speed machine. The production cost can be reduced by 81j, especially when the air cylinder 10 is equipped with the town m'Irt cars 13a, 13b and the fixed slide 4.
14, the stroke of the air cylinder 10 can be suppressed to less than half the water depth from which the supernatant liquid is drawn, and the height of the lifting device 6 can be lowered.

In addition, since the lifting device 6 is installed all together on the tank wall 1a of the processing tank 1, maintenance and inspection are easy.
Since the speed controllers 19a, 19bt' and ClC can easily adjust the expansion/contraction/operation speed of the air cylinder 10, the raising/lowering speed of the supernatant liquid drawing unit 5 can be adjusted easily. can be installed optimally. Furthermore, the liquid level of the supernatant liquid is above a+: the lower limit level of liquid withdrawal LWI.

When this level is reached, the level switch 28 provided in the treatment tank 1 is turned on, and the electromagnetic switching valve 23 is switched by the 1g signal from the level switch 28, so that the supernatant liquid drawn out 'd5 is pulled up. The liquid can be reliably pulled out with one force to the set level, and by setting the level switch 28 to the uppermost position +jlB14ffi,
The drawing water depth of the upper fi liquid, that is, the pulling start position of the supernatant liquid drawing f5 can be freely adjusted to f4m.

Also, when the movable pulleys 13a and 13b of the lifting device 6 move up and down, the movable ends! When installing Jj13a and 13b, the temporary guide @26°26 of 12.12 is guided along the guide rail 25.25, so the movable pulley 1
The vertical movements of 3a and 13b are extremely smooth, and the supernatant liquid drawing tube 5 can be smoothly started and reached. Further, a limit switch 27 is provided in the upper part of the inside of the support frame 9, and this limit switch 27 is connected to the movable pulley 13a.
The next step of the supernatant liquid withdrawal process, that is, the receiving and aeration process of the raw wastewater, starts when the supernatant liquid withdrawal step 5 is detected. There is no fear that the reception and aeration will start, and each process is carried out accurately.Furthermore, since the processing of the fixed pipe 7 [1 outside the y1 part is provided with the Ryuhako Sesho 8, Supernatant liquid withdrawal miscarriage can be adjusted in advance to optimize the extraction time.In addition, supernatant liquid withdrawal fi5
The float 3 is formed in an annular shape, and the upper housing liquid extraction port 4 is provided below the center of the float 3, so that the scum on the upper liquid surface is blocked by the float 3 and flows into the extraction port 4. There's nothing to do.

By the way, in the above embodiment, a hydraulic cylinder may be used instead of the air cylinder 10. Also.

Although a four-way valve is used as the electromagnetic switching valve 23, other switching = fP may be used, such as using two three-way valves, for example. Furthermore 1. III! 17, when the movable pulleys 13a, 13b descend, the wire rope 18 loosens and the pulleys 13a,
This is provided to prevent it from coming off from the wire ropes 13b and 14, and M is the 1kt wire rope 18, the wire rope 18, and each wire rope 13a.

13b and 14, and is fixed in consideration of the stiffness of the wire rope 13b and 14. Usually, a wire rope with a weight of 1.2 to 1.5 of the weight of the wire rope 18 is adopted. 6 slides IL13a, 13b.

For example, if a detachment prevention member 30 as shown in FIGS.
It is possible to use a member for fixing the to the support frame 9.

Further, in the lifting device lt6 of the above embodiment, two movable pulleys 13a and 13b and one fixed pulley 14 were used.
The number of these is not limited, and for example, the movable pulley may be 31151. It is also possible to use two fixed pulleys, in which case the stroke of the air cylinder IO can be set to 174, which is the supernatant liquid withdrawal water depth. Furthermore, FIGS. 13 to 15 show other embodiments of the above-mentioned lifting device 6, and in this embodiment, a pair of left and right fixed pulleys 14a and 14b are attached to an upper position inside the support frame 9. , a connecting member 11a is attached to the leading end of the rod 10a of the air cylinder 10.
One movable pulley 13 is attached via the air cylinder 10, and when the air cylinder 10 is extended, the movable pulley 13 is lowered and the supernatant liquid drawer #5 is in a bad condition, and the air cylinder 10 is contracted. Then, the movable pulley 13 rises, and the supernatant liquid drawing f5 is brought to a floating state. Further, in this embodiment, the same dk discharger as the limit switch 27 is installed in the lower part of the inside of the support frame 9. In addition, a limit switch 27a is provided inside the support rack 89 to guide the bearing portion 13c of the movable pulley 13.

Furthermore, in the above d-Embodiment, the processing tank 1 is provided with a level switch 28 for detecting the lower limit level LWL for drawing the supernatant liquid,
The supernatant liquid withdrawal point 5 was made to rise by the <g from this level switch 28, but instead of this, when the float 3 reaches the supernatant liquid withdrawal lower limit level LWL!
ii4*L so that 17 comes into contact with the stopper 24, and limit switch t? It is also possible to provide a contact signal and pull up the upper ffi puller #5. Further, in the above embodiment, the miscarriage regulating valve 8 is provided in the fixed valve d7, and the upper 1% fN! i, I tried to adjust the withdrawal miscarriage.

The flow control pot valve 8 is a fully automatic valve, and a liquid level meter and a plurality of sludge interface needles arranged at predetermined intervals are provided in the processing □ii l to measure the level difference between the liquid level or the outlet 4 and the sludge interface. When the g is large, increase the drawing g filter (flow velocity) and
When the level difference is small, the opening Ml of the automatic valve may be controlled to reduce the drawing flow f.

Furthermore, in the above, we have explained the supernatant liquid drawing device jtA used in a batch type biological treatment equipment in which the receiving process of raw wastewater is performed at the same time as the aeration process, but the aeration process begins in the middle of the first trowel of receiving raw wastewater. Batch type biological treatment equipment, and continuous flow type batch biological treatment equipment in which the raw wastewater reception process is also performed during the fumarole type, sludge static separation process, and supernatant liquid withdrawal process, and the reception process, Aeration equipment,
It goes without saying that a similar supernatant liquid extraction device [tAe] can also be used in a normal batch-type biological treatment apparatus in which a sludge static separation process and a supernatant liquid extraction process are performed sequentially.

"Young fruit of the invention" As explained above, the supernatant liquid drawing device of the present invention uses a supernatant liquid drawing # equipped with a float, so that the sludge rising port is not disturbed when the supernatant liquid is drawn. The liquid supply of the supernatant liquid that is exhausted and discharged is maintained, and the raising and lowering f7c
Activate the moving cylinder of iIt and cIIwJ? 1ilt
Since the supernatant fluid is drawn out and raised by gradually opening or approaching the fixed pulley, the structure of the device is improved, resulting in better maintainability and operability. wither.

[Brief explanation of drawings]

Figures 1 to 11 show one embodiment of the present invention, Figure 541 is a schematic WT view of the entire supernatant liquid drawing device installed in the processing tank, and Figure 2 is a plane view of the supernatant liquid drawing pipe. Fig. 3 is a side view of the same section, Fig. 4 is a view of the bar 1v in Fig. 2, Fig. 5 is an enlarged view of the lifting device, and Fig. 6 is an enlarged view of Fig. 5. Vl-Vl arrow OA side view. Figure 7 is a cross-sectional view of the vit-btt skyline in Figure 5. Figure 8 is a kl-Vjll arrow view in Figure 5. Figure 9 is an explanatory diagram of the wastewater treatment process. Figures 10 and 11 are A schematic diagram of the entire surface for explaining the operation of the supernatant liquid drawing device, and the first
Figure 2 (a) is a schematic diagram showing how the wire rope retaining member is installed. 12(b) is a cross-sectional view taken from arrow b in FIG. 2112(a), FIG. 13 is a cross-sectional view showing another embodiment of the lifting device, and FIG. Front view, 1st
FIG. 5 is a sectional view taken along the line xv-xv. 1...Processing tank, 1a...N lid, 2...
...Communication device, 3...Float, 4...
...Extraction port, 5...Supernatant liquid withdrawal, a, 6
..... Raising device, 7.. river/fixed pipe, death...
・Flow rate adjustment valve, 10...Air cylinder (moving cylinder), 13a, 13b, 13...Taku Machi, 18...Wire rope (rope body), 14 ．． t4
a, 14b...mark/fixed 9I car. Applicant IJr Co., Ltd. f4 Iron Works Agent Patent Attorney Masatake Shiga 1 Figure 6

Claims (2)

[Claims] (1) A communication device that is installed on the tank wall to communicate between the inside and outside of the tank, a float and a supernatant extraction port are provided at the tip, and the proximal end is connected vertically to the opening end inside the tank of the communication device. A supernatant liquid drawing pipe is rotatably connected and swings up and down as the liquid level rises and falls, and a cable body connected to the supernatant liquid drawing pipe is wound alternately around a movable pulley and a fixed pulley. , a movable pulley is provided with a movable cylinder that moves the movable pulley away from or approaches a fixed pulley, and a lifting device that raises and lowers the supernatant liquid drawing tube centering on the base end by the operation of the movable cylinder; A supernatant liquid extraction device characterized by comprising: (2) The communication device includes a fixed pipe fixed to a portion of the tank wall below the lower limit level for supernatant liquid withdrawal through the tank wall, and a flow rate adjustment valve provided at the end of the fixed pipe outside the tank. A supernatant liquid drawing device according to claim 1, characterized in that the device comprises: