JP2892016B2 - The supernatant water discharge device in the sewage treatment tank - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a device for discharging supernatant water in sewage treatment.

[Prior art and its problems] Sludge precipitates after treatment in batch type sewage treatment, etc.
Conventionally, during the aeration / agitation treatment, the sludge mixed water in the treatment tank often flows into the supernatant water collecting port during the aeration / agitation treatment, and the sludge mixed water flows into the water collecting port and the discharge port. Since the supernatant water is discharged while remaining in the road,
As a result, the sludge mixes and flows out at the beginning of the discharge. Also,
At the end of the discharge, it was often said that the sediment sludge was easily involved and it was difficult to discharge the clear supernatant.

[Object of the Invention] It is an object of the present invention to provide a supernatant water discharge apparatus in which sludge is not mixed in at the beginning and end of discharge.

[Structure of the Invention] In the apparatus for discharging supernatant water in a sewage treatment tank according to the present invention, a funnel-shaped water collection port connected to the discharge port through a flexible tube is provided in the sewage treatment tank, and The opening edge is lowered below the water surface to open a flow path leading to the discharge port, and the above flow path is closed by floating above the water surface, and the opening edge of the opening edge is opposed to the buoyancy of the water collecting port. Equipped with a lower pressure means to allow the supernatant water in the tank to flow into the water collection port by immersing the entire circumference or one side below the water surface, and to set the opening edge of the water collection port that sinks by the inflow of the supernatant water below the water surface Stop means for anchoring a float for holding the water at a predetermined depth to the outer periphery of the water collecting port, and stopping the sedimentation when the opening edge of the water collecting port, which sinks as the water level in the tank falls, reaches a predetermined lower limit. Is equipped, and the water level in the tank is By residual water in the water collecting mouth flows down condensing Mizuguchi opening edge are brought configured floats on the water surface together with the flowing action of the water collecting mouth drops is not performed until the.

The lower pressure means for allowing the supernatant water in the tank to flow into the water collection port is as follows: the weight suspended by the cord body is automatically or manually dropped, so that the entire circumference or one edge of the opening edge of the water collection port is opened. After being immersed below the water surface, it is configured to return to the original suspended position again, or by manually operating a lever to lower one point of the opening edge of the water collecting port so as to be slopingly immersed below the water surface. Be composed.

Further, as the stopping means for stopping the sinking of the water collecting port, the water collecting port is suspended by a string guided from above the water surface, and in a state where the string is in an extended state, the opening edge of the water collecting port is a lower limit after the discharge is completed. The structure is adjusted so that the water level is equal to the water level, or the water collecting port is supported at a position where the opening edge of the water collecting port is at the same level as the lower limit water level at the end of discharge by the locking body provided in the tank. The structure is adjusted so that it can be adjusted.

[Example] In the drawings of the example, reference numeral 1 denotes a water collecting port having a funnel-shaped upper surface, which is provided in a sewage treatment tank 4 so as to be connected to a discharge port 3 through a flexible tube 2. When the opening edge 1e of the water collecting port 1 descends below the water surface, a flow path leading to the discharge port 3 is opened, and the flow path is closed by floating above the water surface.

5 is a lower pressure means operated automatically or manually,
At the start of the discharge, the opening edge 1e is immersed below the water surface against the buoyancy of the water collecting port 1 so that the supernatant water in the tank flows into the water collecting port 1. This lower pressure means 5 is, for example, a weight 7 suspended by a string pair 6 operated by a winder or the like.
Is dropped to the center of the water collecting port 1 as shown by a dotted line in FIG. 1, so that the opening edge 1e is immersed below the water surface, and then is raised and returned to the original hanging position again. In this case, it is necessary that the weight of the weight 7 is equal to or greater than the drainage volume on the water surface of the water collecting port 1. However, the weight 7 is dropped on one end of the opening edge 1e so that the funnel 1 is inclined. If it comprises, the weight 7 should just be light in weight. Further, as an auxiliary lower pressure means, as shown in FIG. 2, by operating the manual lever 8, one point of the water collecting opening opening edge 1e can be lowered to be slopingly immersed below the water surface. This can be useful when the main lower pressure means 5 driven by a machine or the like fails.

Reference numeral 9 denotes an annular float tethered to the outer periphery of the water collecting port 1 by a string pair 10, and holds the opening edge 1e of the water collecting port 1 settled by the inflow of the supernatant water at a predetermined depth S below the water surface to collect the water. The inflow speed into the inside is made uniform, and also serves as a fence so that scum does not flow into the water collecting port 1.

Numeral 11 denotes a stopping means for stopping the sedimentation of the water collecting port 1. For example, three or more cord pairs 12 led down from the water surface are provided.
…… Water catcher 1 is suspended horizontally by 12 and these string pairs 12…
... it is keep adjusted so that condensing water outlet opening edge 1e is discharged at the end of the lower limit level l ₀ and equal height in the extended state of 12. It is also obtained by adjusting so that condensing water outlet opening edge 1e can bearing a condensed water outlet 1 at equal height and a position and a lower limit level l ₀ at discharge ends by engaging body 13 that is provided on the tank.

Reference numeral 14 denotes a buoyancy adjusting weight attached to the lower end of the water collecting port 1.

[Action] After aeration and agitation, the first time when the supernatant water is not discharged
As shown by the solid line in the figure, the water collecting port 1 causes the opening edge 1e to float on the water surface by its own buoyancy.

In order to discharge the supernatant water after the sedimentation, as shown by the dotted line in FIG. 1, the weight 7 is dropped so that the opening edge 1e of the water collecting opening is immersed below the water surface and then returned to the original hanging position. The weight 7 is raised and returned. Alternatively, as shown in FIG. 2, the water collecting port opening edge 1e is slopingly sunk below the water surface by operating the manual lever 8.

If the water collecting port opening edge 1e is immersed below the water surface in this way, the supernatant water in the tank flows into the water collecting port 1, so that the weight 7
Alternatively, even if the lower pressure by the manual lever 8 is released, the water collecting port 1 does not float on the water surface, the flow path leading to the discharge port 3 is opened, and the discharging operation of the supernatant water is started.

As the discharge action progresses, the water level in the tank gradually decreases as shown in Fig. 3 and the discharge port 3 also sinks down. However, the float 9 anchored to the outer periphery of the water collection port 1 causes the opening edge 1e of the water collection port to be below the water surface. At the same time while maintaining a predetermined depth S.
Then, in order to prevent the sludge from being sucked into the water collecting port 1, if the predetermined lowering limit set in advance by the stopping means 11 is reached,
Settling of catchment 1 stops. As a first embodiment, by adjusting the length of the cord body 12.
1e sets the lowering limit to stop at above the sediment surface l ₁ of sludge. When the lower limit is reached, as shown in FIG. 4, the string bodies 12... 12 are no longer slackened and are in an extended state, and the lowering of the water collecting port 1 is controlled. In the second embodiment, the lowering limit is set by adjusting the position of the locking body 13 provided in the tank. When the opening edge 1e of the water inlet reaches a predetermined lower limit, the water inlet 1 is supported by the locking body 13 as shown in FIG.

Setting the lower limit of the water collecting port 1 by adjusting the stopping means 11 at the same time is the same as the lower limit water level l ₀ at the end of discharge.
Is also to determine.

In the state of FIG. 4 in which the lowering of the water collecting port 1 is stopped,
The discharge of the supernatant water continues for a while. However, as shown in FIG. 5, when the water level in the tank drops to the same level as the water inlet opening edge 1e, the supernatant water can no longer flow into the water inlet 1. Then, as the residual water in the water collecting port 1 flows down, the water collecting port opening edge 1e floats on the water surface as shown in FIG. 6, and the discharge operation ends.

When the wastewater is supplied into the treatment tank 4 and the water level in the tank rises, the water collecting port 1 also rises and returns to the state shown in FIG. 1 again.

[Effect] The apparatus of the present invention has a structure in which the opening edge 1e of the water collecting port 1 is lowered on the water surface to open a flow path leading to the discharge port and floats on the water surface to close the flow path. Therefore, it is possible to prevent the sludge mixed water in the treatment tank from flowing into the water collecting port during the aeration / stirring treatment, and there is no possibility that the sludge will be mixed and discharged at the initial stage of discharge as in the related art. Further, since the settling of the current Mizuguchi 1 above the predetermined lowermost than the sludge settling interface l ₁ that is not set in advance by the locking means 11 has a structure to stop and to involve also precipitated sludge discharge end Therefore, there is an advantage that clear supernatant water free of sludge can always be discharged.

[Brief description of the drawings]

The drawings are longitudinal side views of the main part of the apparatus of the present invention, FIG. 1 shows a state in which supernatant water has not been discharged, and FIG. 2 shows a state in which a manual lever has been operated to start discharge of supernatant water. 3 shows a state in which the discharge of the supernatant water is in progress, FIG. 4 shows a state in which the lowering of the water collecting port is controlled, FIG. 5 shows a state in which the water level in the tank has reached the lower limit water level, and FIG. Indicates a state where the opening edge of the catchment port floats on the water surface at the end of the discharge. 1 ... water collecting port, 1e ... water collecting port opening edge, 2 ... flexible tube, 3
... discharge outlet, 4 ... sewage treatment tank, 5 ... lower pressure means, 6 ...
... String body, 7 ... weight, 8 ... Manual lever, 9 ... Float, 10 ... String body, 11 ... Stopping means, 12 ... String body, 13 ...
Engaging member, l ₀ ...... lower limit level, S ...... underwater predetermined depth.

Claims (3)

(57) [Claims] 1. A funnel-shaped water collecting port (1) connected to a discharge port (3) through a flexible pipe (2) is provided in a sewage treatment tank (4), and is provided with a water collecting port (1). When the opening edge (1e) descends below the water surface, the flow passage leading to the discharge port (3) is opened, and the flow passage is closed by floating above the water surface. Opening edge against buoyancy (1e)
Is provided with a lower pressure means (5) for allowing the supernatant water in the tank to flow into the water collection port (1) by immersing the entire circumference or one side of the tank below the water surface. A float (9) for holding the opening edge (1e) of the water port (1) at a predetermined depth (s) below the water surface is anchored to the outer periphery of the water collection port (1), and the sediment that sinks as the water level in the tank falls. When the opening edge (1e) of the water port (1) reaches a predetermined lower limit, a stopping means (11) for stopping the settling is provided, and the water level in the tank is equal to the water collecting port opening edge (1e). And the inflow into the water intake (1) is stopped, and the residual water in the water intake (1) flows down.
e) is a supernatant water discharge device in a sewage treatment tank configured to float on the water surface, wherein the lower pressure means (5) is a weight (7) suspended by a cord (6). )
The entire periphery or one side of the opening edge (1e) of the water intake opening is lowered below the surface of the water by automatically or manually dropping it, and then it is raised and returned to the original suspended position again. A clear water discharge device in a sewage treatment tank. 2. A funnel-shaped water collecting port (1) connected to a discharge port (3) through a flexible tube (2) is provided in a sewage treatment tank (4), and is provided with a water collecting port (1). When the opening edge (1e) descends below the water surface, the flow passage leading to the discharge port (3) is opened, and the flow passage is closed by floating above the water surface. Opening edge against buoyancy (1e)
Is provided with a lower pressure means (5) for allowing the supernatant water in the tank to flow into the water collection port (1) by immersing the entire circumference or one side of the tank below the water surface. A float (9) for holding the opening edge (1e) of the water port (1) at a predetermined depth (s) below the water surface is anchored to the outer periphery of the water port (1), and the sediment that sinks as the water level in the tank falls. When the opening edge (1e) of the water port (1) reaches a predetermined lowering limit, a stopping means (11) for stopping the settling is attached, and the water level in the tank is equal to the water collecting port opening edge (1e). And the inflow into the water intake (1) is stopped, and the residual water in the water intake (1) flows down.
e) is a supernatant water discharge device in a sewage treatment tank configured to float on the surface of the water, wherein the lower pressure means is provided at one point of an opening edge (1e) of a water collection port by operation of a manual lever (8). Characterized in that it is configured to lower the pressure of water and to immerse it under the water surface in an inclined manner, wherein the supernatant water discharge device in the sewage treatment tank. 3. A funnel-shaped water collecting port (1) connected to a discharge port (3) through a flexible tube (2) is provided in a sewage treatment tank (4). When the opening edge (1e) descends below the water surface, the flow passage leading to the discharge port (3) is opened, and the flow passage is closed by floating above the water surface. Opening edge against buoyancy (1e)
Is provided with a lower pressure means (5) for allowing the supernatant water in the tank to flow into the water collection port (1) by immersing the entire circumference or one side of the tank below the water surface. A float (9) for holding the opening edge (1e) of the water port (1) at a predetermined depth (s) below the water surface is anchored to the outer periphery of the water collection port (1), and the sediment that sinks as the water level in the tank falls. When the opening edge (1e) of the water port (1) reaches a predetermined lower limit, a stopping means (11) for stopping the settling is provided, and the water level in the tank is equal to the water collecting port opening edge (1e). And the inflow into the water intake (1) is stopped, and the residual water in the water intake (1) flows down.
e) is a device for discharging supernatant water in a sewage treatment tank, which is configured to float on the water surface, wherein the stopping means (11) is collected by a locking body (13) provided in the tank. wherein the Mizuguchi opening edge (1e) are brought adjusted to be supporting the current Mizuguchi (1) at the lower limit level (1 ₀₎ and a constant height position when released ends, the upper in the sewage treatment tank Clear water discharge device.