JPS6295198A - Batch type biological treatment tank - Google Patents

Abstract

PURPOSE:To make optimum adjustment of a flow rate by providing a treated water tank alongside a biological treatment tank and changing the discharge of the supernatant liquid in the biological treatment tank according to the discharge of the supernatant liquid from the treated water tank by a pump. CONSTITUTION:A supernatant liquid discharge pipe 14 which has a float 11 and supernatant liquid discharge port 12 at the top end and of which the top end part follows up the fluctuation of a water level is provided in the biological treatment tank 10. A communicating pipe 13 of which one end is connected to the base end of the discharge pipe 14 and the other end opens in the position below the lower limit level LWL for the supernatant discharge in the treatment tank 10 of the treated water tank 34 and which introduces the supernatant liquid discharged by the discharge pipe 14 into the treated water tank 34 is disposed. The supernatant liquid accepted in the treated water tank 34 is discharged by the pump 36 and the liquid level is directly or indirectly detected in a control means 40 when the liquid level in the treated water tank 34 exceeds the bottom end of the aperture of the communicating pipe 13. The pump 36 is started and stopped by such means. As a result, the supernatant liquid discharge flow rate is adjusted to an optimum rate.

Description

[Detailed Description of the Invention] 1-Field of Sedentary Work This invention is a single biological treatment process that can be used in a single biological treatment process, for example, an aeration process, a sludge dumping process, and a sludge extraction process. This invention relates to a batch biological treatment system for treating sewage by returning the cycle consisting of (1) and (2) to a float-type upper D-liquid extraction bud extraction stage for discharging the agitator.

"Advanced technology" Conventionally, in batch-type biological treatment equipment that has a float-type supernatant fluid, the start and end of the intake of marketed fluid can be
As shown in Fig. 12, the lowering and rising of the upper heel semi-drawn pipe 1 causes the liquid level to rise, or as shown in Fig. 13, the valve 3 provided with the 9P outlet l of the upper heel semi-drawn f#2 Logger 4
This is done by opening and closing based on Construction No. 1g of Jiki) et al. The extraction of the upper tX= was to disguise the natural η due to the level difference between the dead surface of the biologically treated seedling 5 yen and the discharge opening of the supernatant liquid extraction -11,2. Therefore, near the end of the upper At liquid withdrawal process when the upper At liquid extraction process approaches the extraction ports 1a, 2a and the sludge interface S〃j, the upper f enemy withdrawal flow t( The advantage is that the flow rate is reduced and sludge entrainment is avoided. In addition, floats 10.2 of supernatant liquid drawing officers 1 and 2
The scum floating on the top of the supernatant is removed from the liquid pulling tubes 1 and 2 by the ring-shaped holes 1a and 2alCm.
It also had the advantage of being able to prevent people from doing it.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional biological treatment equipment, since the supernatant liquid is drawn by natural flow as described above, the drawing flow J is large at the initial stage of drawing, and for this reason, the activated sludge is The force j'4f# is used to start the upper & Q51 extraction @ after sedimentation reaches a predetermined level or below (for example, below the level of approximately half the liquid level of the sludge). The direct separation process and the commercial sludge extraction process are long: When the volume is increased, the extraction time is fixed and it is not possible to adjust the time depending on the situation such as sludge pouring. .

This invention was made in view of the above-mentioned point 1, and is a batch type biological treatment a that takes advantage of the float type supernatant liquid withdrawal rate and can adjust the supernatant liquid withdrawal flow rate.
The purpose is to provide lt.

"Means for Solving the Problems" In order to achieve the above object, the present invention is provided in a biological treatment tank, and at least the tip portion is provided with a float and an outlet for removing the supernatant liquid. is the supernatant liquid withdrawal pipe that follows the fluctuation of the water level, and -jm is i5 of the above-mentioned supernatant liquid withdrawal pipe.
A communication pipe connected to one end of the treated water tank, the other end of which opens at a position below the lower limit level for drawing out the upper g liquid in the biological treatment tank, and which introduces the supernatant liquid drawn by the upper liquid withdrawal pipe into the treated water tank. and a pump for discharging the upper liquid received in the above treated water tank, and with the /& surface of the upper AC processing water tank exceeding the above communication/d opening lower 4, carefully direct or indirectly the liquid level. The pump is configured to include a control means for starting and stopping the pump.

"Operation" In the batch-type biological treatment apparatus of the present invention, the biological treatment +4V'3 water is led into the treated water tank through the upper draw pipe and discharged by the pump. At this time, the flow rate of the supernatant liquid is easily increased by one stroke of the 7fi flow hole by the pump.

"Embodiment" Hereinafter, an embodiment of the invention will be described with reference to FIGS. 1 to 11.

10 in the figure is a biological treatment tank, and this biological treatment [9th in 10
The cycle shown in the figure, which consists of receiving raw wastewater, a four-gas process, a sludge stationary separation process, and a supernatant liquid drawing process, is repeated. Inside this biological treatment tank 10, there is disposed a float 11 at the tip, a supernatant liquid extraction port 12e, a NL base end connected to the four-way pipe 13, and a supernatant liquid draw-out g14 which is referred to outside the biological treatment dlO. At the same time, on the upper part of the 411 wall 10a of the biological treatment tank 10, a lifting device 15 for raising and lowering the upper liquid withdrawal pipe 14 is installed.

The above-mentioned upper collar liquid drawing member 14 has a liquid collecting pipe 14c that connects to the upper collar outlet 12 via a 45-type curved line L at the tip of a straight line F14a of a predetermined length. In addition, a 90-degree bent pipe 14d is connected to the base end of the gong 1t14a, and the bent pipe 14d at the base end connects the rotary hand 14e to the bent pipe of the communication pipe 13 fixed to the tank J11Qa. It is rotatably connected up and down via the ffc. and,
A pair of left and right connecting plates 14f, 14 are attached to the upper Bepi juice tube 14C.
At the same time, the four pipes 11a, . The left and right pair of mounting plates 111) and 11b are connected to the connecting plates 14f and 14f by the immersion rule 14g, so that they are located below the center of the float 11 and are attached to the left and right pipes lla that are opposite to each other. hand,
It is provided to be rotatable up and down with respect to the connecting plates 14f, 14f.

The lifting device 15 also includes a support pedestal 16 formed of an angle material and fixedly installed on the upper part of the tank filOa of the biological treatment The air cylinder 17 is fixedly attached in a facing direction, and the air cylinder 1
The pair of mJ barleys fixed to the tip of the rod 17a of No. 7 through the locking member 18 are mounted in the same vertical plane on the left and right sides of the plate 19.19. a pair of left and right movable pulleys 20a, 20b that can freely rotate at
Place the mat on the support frame 16 so that the upper 6 body is slightly below the opening of the air cylinder 17 and the upper part of the upper part of the air cylinder 17a.
The movable pulley 20a is attached with the movable pulley 20a facing forward and backward.

A fixed pulley 21 that is rotatable within the same vertical plane as 20b, and a movable pulley 208 on the left side 1 and a fixed beak Ji2.
1, the q-movement shield table on the right side is wound around 20 bis, and
One end is connected to the connecting shaft 14g of the supernatant liquid drawing pipe 14 via a simple 22a.

The other end is inserted into the guide hole 23 provided vertically on the lower surface of the support frame 16 211I! There are four wire ropes 22 connected to the i+ spider 24. Therefore, the cylinder body 17b of the upper air cylinder 17 has two air vents 26a and 26b each equipped with a speed controller 25a and 25b, and these two air vents are connected to each other. 26a.

26b is connected to four side valves 29 which are connected to a compressed air source 28 by an air pipe 27, and as shown in FIG. 17b by supplying rod 1
7a, and raise the thin wheels 20a and 20b to separate them from the fixed pulley 21. At the same time, as shown in FIG.
The rod 17a is extended by supplying the rod 17a from a to the cylinder body 17b, and the 0T obstructing beaks 20a and 20b are lowered to come close to the fixed pulley 21. Further, a stopper 30 made of a pipe having a diameter smaller than that of the guide 123 or a member having a U-shaped cross section when viewed from above is provided at the joint portion of the guide 123 with respect to the support frame 16. Guide - #2
It is designed to be transmitted upward from 3. Furthermore, on the front and rear sides of the interior of the support pedestal 16, guide rails 31, 31, formed by arranging a pair of left and right angle members in the same manner as each other, are installed, while the above-mentioned mounting is done using the plate 19. 1
9, the upper and lower parts of the wire member 18 are the shaft 32a.

A kite 4@:32.32 consisting of single wheels 32b and 32b, respectively, is attached to the inner end of the guide rail 32a so that the @- can be heard at the front and rear. I'm waiting for the door to move. Furthermore, the biological treatment 410 is provided with an Ml level switch 33 that detects when the level force S of the supernatant liquid reaches the lower limit level LWL for drawing out the upper sludge. In response to a signal, the above-mentioned 1c @ switch valve 29 is switched to the position shown in FIG. 10.

On the other hand, upper dd biological department 4! Adjacent to the cypress 10 is a treated water tank 34 (within which the outer end of the communication pipe 13 is exposed).
A pump 36 with a discharge pipe 35 on the discharge side is installed at the bottom of the treated water tank 34.
It is IL. Then, 12. A photoelectric meter 37 and a flow rate regulator 38 whose opening degree is distorted by 1 g from the current meter 37 are provided, and a circulation front 39 for discharging the upper asperate to the treatment water tank 34 is connected, and this circulation and
A break fixture 391 is provided at d39. Further, in the treated water tank 34, the surface e in the treated water +ll34 is a predetermined upper limit.

An upper level switch 40a detects when the level f (, WL is reached and starts the pump 36, and detects when the liquid level in the treated water pond 34 reaches a predetermined lower limit level L, WL). At the same time, the upper gr2 pump 36
The upper level switch 40a and the lower level switch 40b detect the status of the treated water tank 34 and stop the pump 36 based on the horizontal level. Moving liquid level detection device! 140 (lttlJ control means) t-configured.

Here, the installation height of the opening 13 provided in the treated water tank 34 may be lower than the lower limit level LWL for drawing out the supernatant liquid in biological treatment aIfMio 2, but when the sludge static separation process is completed. The sinking sludge interface S and the upper casing liquid withdrawal lower limit level 1. It is preferable to provide it between WI and WI, and it is preferable to set it in the vicinity of the lower limit level L and WL of the upper U pullout.

In addition, the capacity of the treated water tank 34 is 1 O of the biological treatment tank 10.
It is much smaller than the water waves processed in the cycle. Roughly speaking, the liquid level detection position of the lower level switch 40b (ie, the lower limit level L, WL) of the treated water tank 34 is in communication with the same level as the lower limit level LWL of the supernatant liquid drawn in the biological treatment [10]. and the lower end of the opening, preferably at the same level as the supernatant liquid withdrawal lower limit level LWL. Also,
The configuration position of the upper level switch 40a (that is, the upper limit level H2WL of the treated water tank 34) is, of course, a high position exceeding the liquid level level of 1 degree of the lower level switch 40b, and the supernatant liquid of the biological treatment mlO is Overlay liquid lithography'#14
The liquid level flows into the treated water tank 34 through the biological treatment tank 10 and the treated water tank 34, and the liquid level is below the virtual liquid level where the liquid levels in the biological treatment tank 10 and the treated water tank 34 match (balance) each other, preferably at the lower limit level LWL' for supernatant liquid withdrawal. A level near the lower limit level for supernatant liquid withdrawal exceeding i is preferable.

In addition, HWL in the figure is the upper limit level for drawing the supernatant liquid of the biological treatment tW10, and the water level V of the biological treatment tank 10 is set to F6i''j during the sludge treatment process.

Next, the operation of the above-mentioned biological treatment apparatus d will be explained, but before explaining the operation of the entire biological treatment apparatus, the operation of the raising and lowering device 15 will be explained first.

Upper 6 pi lifting device! tistThe shallowness of the liquid that rises'#
In order to levitate 14 above the liquid surface, set the magnetic switching valve 29 to the position shown in Fig.
The rod 17a is extended from the cylinder body 17b to the cylinder body 17b. Then, the OT movable slides 20a and 20b descend and approach the fixed pulley 21, but at the extended end of the rod 17a, the length of the wire rope 22 that was holding the supernatant liquid drawer 114 upright is caught by Imabari. As a result, the upper liquid drawer #14 is rotated downward at the Lg1 transfer joint 14e and floated above the upper liquid level. At this time, the wire rope 22 does not loosen because the wire rope 22 is provided with a lock 24 at its end, but when the top of the supernatant liquid is at the upper level of the upper level HW l, Narrow 24 in Figure A1 has descended to the lower end of guide 23.

Further, in order to raise the supernatant liquid drawer 114 upwardly by the raising device 151, the frame 29 is cut into the position shown in FIG. Then, If, the trapped air enters the cylinder body 17b from the lower air 26b and flows into the rod 17a.
The rice is harvested, and as a result, the movable pulleys 20a and 20b rise and move away from the fixed pulley 21. wire rope 22
is a movable pulley 20a.

Since the wire rope 20b is wound alternately around the fixed pulley 21, as the movable pulleys 20a and 20b rise, the wire rope 2
2 is pulled up and first I424 hits the stopper 30,
! ! 24 or the stopper 301 is locked and cannot be raised any further, this summer, the company's liquid withdrawal pipe 14 is pulled up via the wire lobe 22'ft and becomes the upright state as shown in Fig. A10.

Next, in the biological treatment apparatus having the above configuration, the biological treatment tank 10 where the surface e is the upper limit level HW L lc for drawing the supernatant liquid.
The case where the upper degree a of is discharged will be explained.

In this case, the raising/lowering f&15 is operated as described above to float the commercially available draw-out tube 14 above the liquid surface. The supernatant liquid in the biological treatment tank 10 is removed from the extraction port 1 due to the level difference between the liquid level in the biological treatment tank 0 and the communication/d13 opening.
2. Q) The upper RL liquid enters the interior of the extraction tank 14, flows down naturally, and flows into the treated water tank 34 through the communication d13.
Since the capacity of the treated water rvA 34 is extremely small, the liquid level in the treated water tank 34 rises immediately and the upper level switch 40a is activated.
enters, the pump 36 is started, and the treated water tank 3
The supernatant liquid in 4 is discharged through a discharge pipe 35. and.

Due to this discharge, the liquid levels of the biological treatment tank 10 and the geological water 4034 become approximately equal (balanced), and from then on,
The upper pipe liquid of the biological treatment tank 10 is drawn out from the biological treatment tank 10.
Since the liquid level in the treated water tank 34 decreases to approximately the same level as
It is approximately equal to the discharge layer of the supernatant liquid discharged from the treated water tank 34 via the pump 36. Konotosa, biological treatment tank 10
The flow rate of the supernatant liquid can be adjusted in advance by adjusting the discharge flow rate of the supernatant liquid by the pump 36, and the control of the discharge gt of the supernatant liquid by the pump 36 is controlled by the discharge pipe. This can be done by public means such as a flow rate control valve 38y provided at 35 or a rotation control of the pump 36.

On the other hand, when the withdrawal of the upper fN progresses and the liquid level of the biological treatment tank 10 reaches the lower limit level for supernatant liquid withdrawal, L W l, +C, the second rubel switch 33 of the biological treatment tank 10 detects this, and the detection signal The lifting device 15 is activated by
The Ft liquid drawing unit 14 is raised, and drawing of the overlying liquid is stopped. In addition, the pump 36 is activated when the liquid level in the treated water tank 34 is at the lower limit level L, ~ vLic is slow, and the lower level switch 40
b fl this! i: Operate until you notice n6゜In this way, in the biological treatment equipment with the above configuration, the treated water tank 34 is adjacent to the biological treatment tank 10Ill/), and the upper liquid is removed from the water. , pump 36 from the initial gravity flow
Since the discharge can be changed, the withdrawal flow of the upper liquid from the biological treatment tank 10 can be increased by reducing the output flow of the upper liquid from the pump 36 / treatment water tank 34). i
FA money can be paid in advance. Therefore, since the supernatant liquid can be handled at a flow rate t (flow rate) smaller than that in the case of gravity flow, the amount of sludge mixed into the supernatant liquid is reduced compared to the conventional method. Therefore, even if the sludge has not settled to a predetermined level below the supernatant liquid withdrawal lower limit level LWL in S in the sludge process for a total of A minutes, the sludge does not settle to the predetermined level.

Even in the middle of this step (for example, when only 40% to 70% of the predetermined level of sludge has settled), it is possible to start the drawing step in parallel with the step. , As a result, the total time required for the Jinggong-bunko machine and the Shangyan liquid pulling process? : It is possible to pick up rice. In addition, the cutting timing from the above-mentioned initial natural flow to cutting by the pump 361 can be set optimally by checking the installation position #L of the upper level switch 40a and lower level switch 40b. can.

In addition, Biological Center J2! I hate that the upper IF liquid of 10 is extracted from the supernatant liquid and sent to the treated water tank 341ζ4 through A14.

α side of the treatment water tank 34 with liquid I# of the biological treatment tank 10 or)
! ! ! Because of the level difference l between the opening of the passage 113 and the liquid level η5 in the biological treatment tank 104, if it approaches the lower vortex level LνVL for drawing out the supernatant sludge, the pump 36 will generate a large amount of force due to the Even if the operation was interrupted due to discharge demagnetization, the pulling force of Sou Kamisumi was a natural flow due to the above level difference.
tf is restricted and the upper liquid can be safely withdrawn.

By the way, in the above f41M example, the lower level switch 40b'i it level switch 33 of the biological treatment device 10
If the level switch 33 and the lower level switch 40b'e of the biological treatment @ 10 are installed at the same level as or near that level, one level switch can be used to omit one of them. In addition, in place of the pull bell switch 33 or the lower level switch 40b, the discharge side of the pump 36 for the low flow method, 1+
c) Attach a computation flow meter, which allows the biological treatment tank 1O
The pump 36 may be stopped by detecting that an amount of liquid equal to the amount of liquid discharged during the cycle has been discharged from the treated water tank 34. Further, in the above embodiment, an upper level switch 40at is used as a means for starting the pump 36.
However, at the beginning of supernatant liquid withdrawal, the liquid levels in the biological treatment tank 10 and the treated water tank 34 can be made to match, and the above-mentioned upper The level switch 40a/timer receives a signal indicating the start of supernatant liquid withdrawal, for example, a signal from the electromagnetic valve 29 of the lifting device 15, and the pump is operated for a predetermined period of time from the time the signal is received. Please start up 36.

But that's fine. Therefore, in the present invention, the control means for starting and stopping such a pump may be of any type as long as it can directly or indirectly detect the liquid level in the treated water tank 34. Furthermore, it is of course possible to start and end the drawing of the supernatant liquid by opening and closing the valve 3 as shown in FIG. 13, instead of using the lifting device 15J.

Furthermore, the biological treatment tank 10 is equipped with a liquid level meter and a sludge interface meter that can control the liquid level and sludge interface intermittently or intermittently, based on the level difference between the liquid level and the sludge back surface. Flow rate control unit 38 or pump 3
Alternatively, the pump 361 may continuously control the discharge of the overlying liquid by increasing the number of rotations to 6.

Furthermore, another bend is connected to the open end of the communication pipe W13 via a rotary joint, and the height of the open end of the communication pipe is changed by changing the rotation of the bend, etc. It is also possible to use the VT4 fireflies.

"Effects of the Invention" As explained above, the batch biological treatment apparatus of the present invention has
A treatment water tank is installed next to the biological treatment facility.

The force 1 is obtained by changing the drawing of the supernatant liquid in the biological treatment tank by the natural flow of the upper M drawing pipe to the discharge of the upper liquid from the treated water tank by a pump at a predetermined timing.
In addition, by adjusting the discharge current by the pump by a public means, the flow rate t of the liquid drawn out can be adjusted optimally,
Moreover, since its discharge is inevitably restricted to natural flow, it is possible to reliably prevent sludge from mixing with the supernatant liquid, and
It is possible to shorten the time required for the placing and distributing step, the upper a, g, and drawing steps, and it is also possible to adjust the time for drawing out the supernatant liquid according to the conditions such as the properties of the sludge.

4. Explanation of the 116 car in Figure 1111 Figures 1 to 11 show one embodiment of the present invention, Figure 1 is an overall cross-sectional view, and Figure 2 is a 14th map of Kamisumi Maki Hikikinoshi. , FIG. 3 is a side view of the cross section of the same part, FIG. 4 is a sectional view taken along the ff-IV arrow in FIG. 2, and FIG. 5 is an enlarged view of the starting device.
Fig. 6 is a vt-vi arrow perspective view of Fig. 5, Fig. 7 is a νu -vii arrow perspective view of Fig. 5, and Fig. 8 is a vt -vi arrow perspective view of Fig. 5.
m-ν1 arrow view, Figure 9 is an explanatory diagram of wastewater treatment works, 1st
0 and 11 are overall sectional views for explaining the operation, and FIGS. 412 and 13 are schematic wr plane views showing conventional examples, respectively.

10...Biological treatment information, 11...Float, 12...Extraction port, 13...Communication'if% 14...Superpox Liquid withdrawal g, 34...
... Treated water (+!, 36 ... Pump, 40
...Liquid level detection device (control means).

Claims (2)

[Claims] (1) A supernatant liquid withdrawal pipe that is installed in a biological treatment tank and has a float and a supernatant liquid extraction port at its tip portion, and at least the tip portion follows fluctuations in water level; It is connected to the proximal end of the drawing pipe, and the other end opens at a position below the lower limit level for supernatant liquid drawing in the biological treatment tank of the treated water tank, and the supernatant liquid drawn by the supernatant liquid drawing pipe is transferred to the treated water tank. A communicating pipe to be introduced, a pump for discharging the supernatant liquid received in the treated water tank, and a pump that directly or indirectly detects the liquid level in the treated water tank when the liquid level exceeds the lower end of the opening of the communicating pipe. A batch-type biological treatment device comprising: control means for starting and stopping the pump. (2) The batch-type biological treatment apparatus according to claim 1, wherein the communication pipe is provided below the lower limit level for drawing out the supernatant liquid from the biological treatment tank.