JPH06269792A - Discharge device for supernatant water - Google Patents

Abstract

PURPOSE:To provide a discharge device for supernatant water enabling to surely control a falling down quantity of a moving trough and also enabling to individually drive moving troughs in plural treating tanks with one drive source. CONSTITUTION:The moving trough 12 provided in the treating tank 10 storing and treating sewage and receiving the treated supernatant water is attached to an endless chain 30 which is stretched between a sprocket 24C at the rotary drive shaft 24B side provided above the water face and a sprocket 28C at the rotary driven shaft 28B side provided at the water bottom, and the rotary drive shaft 24B is rotated reversibly with a drive motor 24D. Thus, since the moving trough 12 falls down accurately by the rotational moving distance of the rotating endless chain 30, the falling down quantity of the moving trough is stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supernatant water discharge device, and more particularly to a supernatant water discharge device for discharging supernatant water treated in batch type activated sludge treatment into a moving trough and discharging the supernatant water.

[0002]

2. Description of the Related Art Conventionally, a batch type supernatant water discharge device performs the processing steps of inflow, aeration, precipitation and discharge of organic wastewater in one cycle in the same treatment tank, and the treated supernatant water is
It was introduced into a moving trough equipped with a float and discharged outside the tank. That is, when the supernatant water is discharged, the air in the float is removed to lose the buoyancy so that the moving trough descends below the water surface under its own weight, and when the discharge of the supernatant water is stopped, the air is discharged into the float. It was injected to increase the buoyancy and raise the moving trough to the surface of the water.

Further, in the treatment process of the supernatant water drainage device, in order to stabilize the treatment efficiency of the aeration treatment and the precipitation treatment, when the supernatant water is always discharged to the standard low water level, the discharge is stopped and a new organic substance is added. It is important to let a certain amount of sewage flow in and return it to the standard high water level.

[0004]

However, when the moving trough is lowered by adjusting the buoyancy of the float as in the conventional clear water discharge device, the moving trough is not stabilized in a descending amount, so that Emissions are not stable. Further, there is a drawback that the amount of discharge cannot be controlled.
As a result, the treatment efficiency of the aeration process and the precipitation process becomes unstable, and there is a problem that it is not possible to discharge the supernatant water of a certain water quality.

For this reason, there is a demand for a supernatant water discharge device which can accurately control the amount of lowering of the moving trough. Furthermore,
Such a batch-type supernatant water discharge device is provided with a plurality of treatment tanks so that the cycle of the treatment process of each treatment tank is increased so that the organic wastewater discharge device and the supernatant water can be continuously discharged. The staggered method is used. For this reason, the treated supernatant water is discharged from each treatment tank in order, and therefore a supernatant water discharge device suitable for this is desired.

The present invention has been made in view of such circumstances, and an object of the first invention is to provide a drainage device for clear water capable of reliably controlling the descending amount of a moving trough. Another object of the present invention is to provide a drainage device for clear water that can individually drive the moving troughs of a plurality of treatment tanks with one drive source.

[0007]

In order to solve the above-mentioned object, the first invention was obtained by treating the treatment steps consisting of inflow, aeration, precipitation and discharge of organic wastewater in the same treatment tank. In a supernatant water discharge device for discharging supernatant water to the outside of the tank, provided in the treatment tank so as to be able to move up and down, provided with a moving trough for introducing the supernatant water, and in communication with an outlet of the moving trough, An expandable drain pipe for discharging the supernatant water flowing into the moving trough to the outside of the tank, a rotary drive shaft side sprocket provided above the water surface and a rotary driven shaft side sprocket provided on the water bottom while the moving trough is attached. It is characterized in that it comprises a chain that is suspended around the drive shaft, and a drive source that can rotate forward and backward to supply a rotational drive force to the rotary drive shaft.

In order to solve the above-mentioned object, the second invention has a plurality of treatment tanks for treating the treatment steps including inflow, aeration, precipitation and discharge of organic wastewater in the same treatment tank. In a supernatant water discharge device that discharges the supernatant water obtained by the treatment to the outside of the tank, a movable trough that is provided in each of the treatment tanks so as to be vertically movable and that allows the supernatant water to flow in, and an outlet for the movable trough. A drainage pipe that is provided in communication with the movable trough and discharges the clear water that has flowed into the trough out of the tank, and the movable trough is attached to the rotary drive shaft side sprocket and the water bottom provided above the water surface. A chain that is suspended around the sprocket that is on the rotary driven shaft side, a drive source that can rotate forward and backward to supply a drive force to each of the rotary drive shafts, and a drive source that is provided between the drive source and each rotary drive shaft, Drive force from the drive source Each clutch means for intermittently transmitting to the rotary drive shaft, and brake means provided between each clutch means and each rotary drive shaft for stopping rotation of the rotary drive shaft when the clutch means is disengaged. It is characterized by being formed.

[0009]

According to the first aspect of the present invention, the moving trough for introducing the clear water is attached to the rotation drive shaft side sprocket provided above the water surface and the chain suspended on the rotation driven shaft side sprocket provided at the bottom of the water. The rotary drive shaft is rotated by a drive source capable of rotating in the forward and reverse directions. As a result, the moving trough accurately descends by the rotational movement distance of the rotating chain, so that the descending amount of the moving trough can be stabilized.

According to the second aspect of the present invention, the moving troughs provided in the respective processing tanks are respectively attached to the rotation drive shaft side sprockets and the rotation driven shaft side sprockets provided in the respective processing tanks. . Further, between the drive source and each of the rotary drive shafts, clutch means in order from the drive source side,
Braking means are provided respectively. With this, by connecting and disconnecting the individual clutch means, it is possible to simultaneously drive the lifting and lowering of a plurality of moving troughs by a single drive source, and to individually drive the moving troughs. Since the means stops the rotation of the rotary drive shaft, the moving trough does not drop under its own weight.

Further, since the drive sources of the first invention and the second invention are made variable in speed, the descending speed at which the moving trough descends can be increased. As a result, the water pressure difference between the water surface and the moving trough becomes larger than that in the case where the moving trough descends slowly, and the inflow speed of the supernatant water flowing into the moving trough can be increased. can do.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a supernatant water discharge device according to the present invention will be described in detail below with reference to the accompanying drawings. Figure 1
The Example of the discharge apparatus of the supernatant water which concerns on 1st invention is shown. As shown in FIG. 1, a treatment tank 1 for treating organic wastewater.
A moving trough 12 having an inflow port 12A on the upper surface thereof is provided in 0, and the moving trough 12 has a pair of parallel guide rods 16 vertically erected via arms 14 and 14 attached to both ends thereof. , 16 are slidably supported. A link type drain pipe 18 extending downward from a discharge port 12B formed at the bottom of the moving trough 12 bends horizontally through a link portion 18A near the bottom of the treatment tank 10 and penetrates a side wall of the treatment tank 10. Has reached the outside of the tank. As a result, the supernatant water flowing into the moving trough 12 is discharged to the outside of the tank 10. Also, this link type drain pipe 1
The link portions 18A, 18A, 18A of 8 are swingably formed, and when the moving trough 12 descends, the link drainage pipe 18 bends through the link portion 18A, and when the moving trough rises, the link The bend of the drainage pipe 18 is designed to extend.

The top plate 10A of the processing tank 10 has an opening 20 formed above the moving trough 12, and the opening 2
On the drive base 22 fixed to the top plate 10A on both sides of 0,
A drive unit 24 of a drive device that raises and lowers the moving trough 12 is provided. On the other hand, the processing tank 10 below the moving trough 12
A driven portion 28 of the driving device is disposed on a driven base 26 fixed to the bottom. The drive unit 24 includes a rotary drive shaft 24B axially supported by a pair of bearings 24A and 24A fixed on a drive base 22 provided with the opening 20 therebetween, and both ends of the rotary drive shaft 24B. A pair of fitted drive sprockets 24C, 24C and a rotary drive shaft 24
A variable speed drive motor 24D capable of rotating in the forward and reverse directions for supplying a driving force to B, a variable speed drive motor 24D and a rotary drive shaft 24B
And a coupling 24E for connecting the. On the other hand, the driven portion 28 includes a rotary driven shaft 28B pivotally supported by a pair of bearings 28A, 28A provided on both sides of the driven base 26, and a pair of driven sprockets 28C fitted to both ends of the rotary driven shaft 28B. , 28C. Then, a pair of endless chains 30, 30 are suspended around the drive sprocket 24C and the driven sprocket 28C, and the arms 14 of the moving trough 12 are attached to the endless chains 30, respectively. Thus, when the variable speed drive motor 24D is rotated in the normal direction, the moving trough 12 descends while sliding the guide rod 14 in conjunction with the movement of the endless chain 30, and when the variable speed drive motor 24D is rotated in the reverse direction, the moving trough is moved. 12 is going to rise.

Next, the operation of the supernatant water discharge device according to the first aspect of the invention constructed as described above will be described. The organic wastewater that has flowed into the treatment tank 10 is subjected to aeration treatment and precipitation treatment at the reference high water level. At this time, the moving trough 12
Is set at the reference high water level so that the supernatant water does not flow from the inlet 12A of the moving trough 12.

Next, when the supernatant water is discharged, the variable speed drive motor 24D is rotated in the normal direction to rotate the endless chain 30 by the distance from the reference high water level to the reference low water level. As a result, the moving trough 12 attached to the endless chain 30 accurately descends by the rotational movement distance of the rotating endless chain 30, so that the descending amount of the moving trough 12 can be stabilized. Further, in order to shorten the discharge time of the supernatant water, if the variable speed drive motor 24D is changed to increase the descending speed of the moving trough 12, the water pressure difference between the water surface and the moving trough 12 increases, and Since the inflow velocity of the trough 12 is increased, the discharge time can be shortened.

Next, when stopping the discharge of the supernatant water,
The variable speed drive motor 24D is reversely rotated to rotate the endless chain 30 by the distance from the reference high water level to the reference low water level. As a result, the moving trough 12 attached to the endless chain 30 is accurately moved up to the original reference high water level by the rotational movement distance of the rotating endless chain 30, and the discharge of the supernatant water is stopped. Can be made.

Next, referring to FIG. 2, an embodiment of the supernatant water discharge device according to the second invention will be described. The same members as those in the first aspect of the invention will be described with the same symbols. As shown in FIG. 2, two processing tanks 10 are provided, and the moving trough 12 is provided with a guide rod 16 in each processing tank 10 as in the case of the first embodiment.
It is provided so that it can slide. Also, the moving trough 1
The second arm 14 is attached to an endless chain 30 suspended from a drive sprocket 24C fitted to the rotary drive shaft 24B and a driven sprocket 28C fitted to the rotary driven shaft 28B.

A forward / reverse rotatable drive motor 24D is connected to a gear box 24F via a coupling 24E, and the drive force of the drive motor 24D is applied to the gear box 24F.
It is distributed in two directions. Further, the driving force distributed by the gear box 24F is applied to the clutch portion 24
G, brake part 24H, speed reducer 24J, coupling 2
It is configured to be transmitted to each rotary drive shaft 24B via 4K.

Thus, by intermittently connecting and disconnecting the individual clutch portions 24G, it is possible to drive the two moving troughs 12 up and down at the same time by using one drive motor 24D or individually drive them. Further, since the brake portion 24H is provided, the rotary drive shaft 24D is prevented from rotating when the clutch portion 24G is disengaged, so that it is possible to prevent the moving trough 12 from dropping by its own weight. Therefore, even when the time schedules of the treatments of the two treatment tanks are shifted and the supernatant water is alternately discharged from the two treatment tanks 10, it can be performed by one drive motor 24D. If necessary, the moving troughs 12 of the two treatment tanks 10 can be simultaneously operated to discharge the supernatant water from the two treatment tanks 10 at the same time.

In the embodiments of the first and second aspects of the invention, the drain pipe 18 has been described as a link type, but it may be a bellows type and any drain pipe that does not obstruct the movement of the moving trough 12 may be used. Anything is fine. Also, the moving trough 1
Although the guide rod 16 is provided as a swing stop for the second member, the present invention is not limited to this and may be any as long as it stabilizes the moving trough 12 horizontally. Moreover, although the endless chain 30 to which the movable trough 12 is attached has been described as two, the number is not limited to two. Further, in the second invention, the processing tank 10 is described as an example of two tanks, but it is not limited to two tanks, and the horsepower of the drive motor 24E and the gearbox 24F.
If the balance with the number of processing tanks is satisfied, the number of processing tanks 10 can be increased.

[0021]

As described above, according to the supernatant water discharge device of the first aspect of the present invention, the moving trough is accurately lowered by the rotational movement distance of the rotating chain, so that the lowering amount of the moving trough is stabilized. Can be made. As a result, the amount of supernatant water discharged becomes constant, and a new amount of new organic wastewater can always be made to flow in, thus stabilizing the treatment efficiency of aeration treatment and precipitation treatment, and discharging a certain amount of supernatant water of quality. You can

Further, according to the second embodiment of the supernatant water discharge device, the driving force from the driving source is intermittently transmitted to the rotary drive shaft provided in each processing tank through the clutch means and the brake means. I chose Accordingly, by disengaging the individual clutch portions, it is possible to simultaneously drive the lifting and lowering of a plurality of moving troughs by one drive source, or to individually drive the moving troughs. Since the means stops the rotation of the rotary drive shaft, the moving trough does not drop under its own weight.

Further, since the drive sources of the first invention and the second invention are made variable in speed, the descending speed at which the moving trough descends can be increased. As a result, the water pressure difference between the water surface and the moving trough can be increased, so that the inflow speed into the moving trough is increased and the discharge time can be shortened.

[Brief description of drawings]

FIG. 1 is a sectional view of a supernatant water discharge device according to a first invention.

FIG. 2 is a sectional view of a supernatant water discharge device according to a second invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Treatment tank 12 ... Moving trough 18 ... Link type drainage pipe 24B ... Rotation drive shaft 24C ... Drive sprocket 24D ... Drive motor 24F ... Gear box 24G ... Clutch part 24H ... Brake part 24J ... Reduction gear 28B ... Rotation driven shaft 28C ... Driven sprocket 30 ... Endless chain

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshihito Narasaki 1-1-14 Kanda, Uchida, Chiyoda-ku, Tokyo

Claims (3)

[Claims] 1. A supernatant water discharge device for processing the treatment steps consisting of inflow, aeration, precipitation, and discharge of organic wastewater in the same treatment tank, and discharging the supernatant water obtained by the treatment to the outside of the tank. A movable trough that is vertically movable in the treatment tank and that allows the supernatant water to flow in, and a stretchable drainage that is provided in communication with the outlet of the moving trough and discharges the supernatant water that has flowed into the moving trough to the outside of the tank. A pipe, the moving trough is attached, a chain hung on a rotary drive shaft side sprocket provided above the water surface and a rotary driven shaft side sprocket provided at the bottom of the water, and a rotary drive force is applied to the rotary drive shaft. A drainage device for clear water, comprising: a drive source capable of rotating forward and backward for supply. 2. A plurality of treatment tanks for treating inflow, aeration, precipitation, and discharge of organic wastewater in the same treatment tank, and the supernatant water obtained by the treatment in each treatment tank is placed outside the treatment tank. In the discharge device of the clear water to be discharged, each of the moving troughs is provided in each of the treatment tanks so as to be able to move up and down, and the moving trough for flowing the clear water is provided so as to communicate with the discharge port of the moving trough to flow into the moving trough. An expansible drainage pipe for discharging the supernatant water to the outside of the tank, the moving trough is attached, and the suspension pipe is hung on a rotary drive shaft side sprocket provided above the water surface and a rotary driven shaft side sprocket provided at the bottom of the water. Chain, a drive source capable of rotating in the forward and reverse directions to supply a drive force to each of the rotary drive shafts, and a drive force provided from the drive source to each of the rotary drive shafts. Each gear that transmits intermittently to the shaft Clear water, which is provided between each of the clutch means and each of the rotary drive shafts, and brake means for stopping the rotation of the rotary drive shaft when the clutch means is disengaged. Discharge device. 3. The device for discharging supernatant water according to claim 1, wherein the drive source is capable of changing speed.