JPH03217205A - Device for removing filth in sewage - Google Patents

Abstract

PURPOSE:To effectively remove the filth on a screen by the impact force produced when the screen is reversed as it rotates by gravity and the squeezing action of the screen by circularly providing the plural comb-shaped screens between the two rotating disks. CONSTITUTION:A couple of disks 15 are fixed to a rotating shaft 13 at a specified distance from each other, plural shanks 16 are provided close to the periphery of the disk at the equal angles to one another, and plural comb-shaped screens 17 with the base end freely rotatably supported by the shank 16, with the free end having an enough length to be placed on the adjacent shank 16 and which are rotated and moved with the rotation of the disk 15 are provided. A bar 22 is lifted with the rotation of the disk 15, brought into contact with the screen 17 which is reversed by gravity when the center of gravity passes the shank, and exerts an impact force on the screen 17. The reversed screen 17 is inserted one by one into the gap between the squeezing plates 23 for squeezing the screen 17 with the rotation of the disk 15 which are fixed to the fixing part.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is applicable to domestic wastewater containing human waste, food waste, etc., wastewater from restaurants and cafeterias, etc., or wastewater from food factories, etc. (hereinafter collectively referred to as "sewage water"). The present invention relates to a sewage mixture removal device for removing solids (mixtures or foreign substances) contained in sewage mixtures.

[Conventional technology]

Conventionally, as a method for removing solid matter contained in wastewater from the above-mentioned wastewater, a removal device using a screen has generally been widely applied. There are various methods of this screen removal device, and representative examples include: a) A screen made of a large number of endless narrow belts arranged in parallel is hung between two upper and lower rotors; The lower end of the screen is submerged in the waste water, and the screen is moved around by rotating the upper rotor, and the solid matter contained in the waste water adhering to the screen is removed by protrusions attached to each belt. A device that separates and removes solids from wastewater by hanging the solids on the screen and letting the solids fall from the part past the upper roller where the screen is reversed. b) A plate-shaped screen is arranged at an angle, A comb tooth is passed through each gap of this screen, and the comb tooth is fixed to a chain or the like so that it can be moved from the bottom to the top. There is one that separates and removes by moving it on the screen.

[Problem to be solved by the invention]

However, in the above-mentioned conventional solid matter removal device using a screen, in method a), the solid matter gets entangled with the screen and remains attached to the screen, and eventually the solid matter gets caught between the rotor and the screen and the screen becomes damaged. This may cause problems such as the screen slipping and stop moving, or in the worst case scenario, solid matter may become entangled with the rotor on the drive side, causing overload on the rotor or motor, resulting in a seizing accident, and the rotor or motor may become damaged. There is a problem that the motor may be damaged.

On the other hand, in method b), solid matter entangled with the comb teeth tends to get caught between the screen and the moving comb teeth, and if this continues, the movement of the comb teeth is impaired, and the motor that moves the comb teeth becomes There was a problem that burn-in accidents occurred.

This invention was made to solve the above-mentioned problems, and its purpose is to effectively separate and discharge solids scooped from wastewater from a screen, and to It is an object of the present invention to provide a sewage mixture removal device that does not impose an unnecessary load on the equipment.

[Means to solve the problem]

In order to achieve the above object, the sewage mixture removal device according to the present invention includes a pair of discs attached to a rotating shaft at a predetermined distance apart, and a pair of discs arranged at equal angular intervals near the periphery of both discs. The base end is rotatably supported by a plurality of shaft parts, and the free end has a length to ride on a rear shaft part adjacent to the shaft part, and rotates as the disc rotates. A plurality of comb-shaped screens, a bar whose center of gravity passes through the shaft portion and reverses itself due to its own weight after rising as the disc rotates, and applies an impact force to the screens, and a fixed bar; Each of the inverted comb-shaped screens is fitted into the gap, and as the disc rotates, the screen is squeezed, and the disc is moved in a fixed direction via the squeeze plate and the rotating shaft. and a drive source that rotationally drives the comb-shaped screen, the solid matter in the waste water adhering to the comb-shaped screen is shaken off by the impact force that collides with the bar when the screen is reversed, and the screen also passes through the scrubbing board. The screen is characterized in that it is configured to scrub off solid matter adhering to the screen itself.

The drive source is characterized in that an electric motor or an impeller attached to a rotating shaft is rotated by the gravitational action of sewage or other fallen objects.

[For production]

In the sewage mixture removal device according to the present invention, the solids scooped out from the sewage by the screen are carried along with the screen which rotates with the rotation of the disk, and then the center of gravity of the screen is aligned with the axis. When it moves to the opposite side of the section, it rotates in the opposite direction due to its own weight and collides with the reversing lever. The impact force at that time shakes off the solid matter adhering to the screen. Then, the screen from which the solid matter has been shaken off is squeezed out by a scrubbing board, and the solid matter that was not shaken off in the above step and remained between the screens is further squeezed out. This almost completely removes solids from the screen.

[Embodiments of the invention]

Hereinafter, a practical example of the present invention will be explained in detail based on the accompanying drawings.

FIG. 1 shows a schematic diagram of the overall structure of a septic tank for combined human waste treatment using the sewage mixture removal device according to the present invention. Hereinafter, the outline of the purification process for human waste (hereinafter referred to as "sewage") will be explained with reference to this diagram. do.

The human waste initially sent through the introduction pipe 1 is sent to the settling basin 2.
The coarse solids are removed from the sewage in the settling basin 2 by the first sewage mixture removal device A according to the invention. Then, the wastewater from which the coarse solid matter has been removed is temporarily stored in the raw water pump tank 3.

Next, the sewage in this raw water pump tank 3 is pumped up by a pump 4 and stored in a flow rate adjustment tank 5, from where it is pumped up by a pump 6, and the relatively fine solids in this sewage are pumped up. is removed by the second sewage mixture removal device B according to the present invention, the solids are collected in the scum storage tank 7, and the wastewater from which the solids have been removed is sent to the first contact aeration tank 8. Here, the wastewater is aerated and then sent to the second contact aeration tank 9 where it is further aerated.

The sewage is almost purified by the treatment in the second contact aeration tank 9, separated by specific gravity in the sedimentation tank 10, and the supernatant water becomes purified water and sent to the disinfection tank 11, where it is disinfected in the sterilizer 12. and discharged.

2 and 3 show a plan view and a side sectional view of the first sewage mixture removal device A described above, and 13 is a rotating shaft rotatably supported by bearing plates 14 and 14. A pair of disks 15.15 are attached to the rotating shaft 13 at a predetermined distance apart. The pair of discs 15.15 are connected by a plurality of shafts 16 arranged at equal intervals near their peripheries, and each shaft 16 has a base end rotatable with the disc 15 as a bearing. Supported. A base end of a coarse comb-shaped screen 17 (the interval between each screen is about 50 m) whose side surface is approximately "C" shaped is pivoted to each shaft portion 16. The tip of this comb-shaped screen 17 becomes a free end and has a length such that it rests on the adjacent shaft portion 16. Therefore, at the lower part of the disc 15, the free end of the comb-shaped screen 17 hangs down due to its own weight and sinks into the settling basin 2 explained in FIG. It is mounted on the rear shaft portion 16.

A sprocket 18 is attached to one shaft end of the rotating shaft 13, and a sprocket 20 is also fixed to the output shaft side of the motor 19, and a chain 21 is hung between these sprockets 19 and 20. , the disc 15 is configured to be driven to rotate at low speed in the counterclockwise direction indicated by the arrow.

On the other hand, a bar 22 extends from the fixed part in front of the disc 15 in the rotational direction, and this bar 22 has an axis centered on the center of gravity of the screen 17 that has been moved eight times forward from above the disc 15. When facing forward from the portion 16, it is reversed by its own weight and collides with force, exerting an impact force on the screen 17.

Further, a squeezing plate 23 is arranged slightly below the bar 22, and this squeezing plate 23 is formed with grooves 23a into which each of the above-mentioned inverted screens 17 is fitted. Disc 15 in a state of depression
As the screen 17 rotates, the screen 17 moves while being squeezed. Note that a sludge receiver 24 is arranged below the bar 22 and the scrubbing plate 23 to store solid matter separated from the wastewater. Further, the settling basin 2 has a weir plate 25,
The sewage overflowing from this weir plate 25 is drained from the drain 2.
The raw water is stored in the raw water pump tank 3 from a.

Next, the operation of the first mixture removing device A configured as described above will be explained.

When the disc 15 is driven by the motor 19 and rotates in the counterclockwise direction of the arrow through the rotating shaft 13, the comb-shaped screen 17 hanging down at the bottom of the disc 15 is flooded with waste water in the settling basin 2. Coarse solids contained in the material get caught and adhere to the surface.

The screen 17 to which the solid matter has adhered is pulled up as the disc 15 rotates, and then moves with the free end of the screen riding on the shaft 16 at the rear of the rotation, and eventually the screen 17 approaches the bar 22. When the center of gravity reaches the front of the axis 16 (to the left in FIG. 3), the screen 17 is turned over by its own weight and the weight of the attached solid matter, and the free end is forced into the bar 22. collide. At this time, most of the solid matter adhering to the screen due to the force of the attack is shaken off and stored in the residue receiver 24. The screen 17 from which the solid matter has been removed is subsequently squeezed into the groove 23a of the squeezing plate 23.

At this time, fine solid matter adhering to each screen is scraped off by the scrubbing plate 23 and discharged to the scum receiver 24.

In this way, the screen 17 from which solid matter has been thoroughly removed
is moved into the sand settling basin 2 again and the above operation is repeated.

In the above description of the operation, the movement of one screen 17 was explained, but of course, in reality, a plurality of (six in this embodiment) comb-shaped screens 17 provided on the disc 15 sequentially move. Perform the above operation.

Next, the configuration of the second wastewater mixture removal device B will be explained using FIGS. 4 and 5.

In this second sewage mixture removal device B, the comb-shaped screen 17 has a narrow screen interval (approximately 2 to 20 an).
However, the disc 15, bar 22, squeeze plate 23, etc., which are rotationally driven by a motor (not shown), are basically the same as those of the first mixture removing device A. 2
Reference numeral 6 denotes an inlet for the sewage pumped up by the pump 6 in FIG. 1, and 27 is a receiving tray for receiving the sewage from the inlet 26, from which the sewage falls onto the comb-shaped screen 17. The sewage that has passed through the screen 17 is discharged from the outlet 29 of the cesspool 28 at the bottom.

In the second sewage mixture removal device B described above, the sewage sprinkled from the saucer 27 onto the comb-shaped screen 17 is
The solids contained therein adhere to the screen 17, and the wastewater from which most of the solids have been removed passes through the screen 17 and is supplied to the first contact aeration tank from the outlet 29 of the cesspool 28 at the bottom. Ru. In this way, the screen 17 to which the solid matter has adhered is turned over by its own weight in the same manner as described above, and is moved to the bar 2'.
2, the solid matter is shaken off from the screen 17, and the screen is squeezed by the squeezing board 23 to remove the solid matter cleanly.

In the second sewage mixture removal device B, the solids in the sewage dropped from the receiving tray 27 are made to adhere to the screen 17, so that some of the solids in the sewage do not adhere to the screen 17. The water passes through the wastewater tank 28 and remains in the wastewater tank 28, but it is scooped out by the screen 17 that hangs down in the wastewater tank 28 and rotates through it, so that the outflow port 29
The sewage discharged from the tank can be supplied to the aeration tank 8 with almost no solids mixed in.

In addition, in the second wastewater mixture removal device B, the saucer 27
Since the position where wastewater is sprinkled onto the screen 17 and the position where the solid matter adhering to the screen 17 is shaken off are far apart, the removed solid matter and the wastewater from which the solid matter has been removed do not mix. do not have.

Note that the present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the spirit thereof.

For example, in the embodiment, the comb-shaped screen 17 in the first sewage mixture removal device A has a side shape of a "C" shape, but in other cases, the tip of the screen is shaped like a packet and solids are scooped into the packet. You may choose to take it.

In addition, the screen 17 may have a substantially flat shape, and in this case, the screen 17 contacts the proximal end of the screen 17 (not shown) to prevent the solids from slipping off the screen that scooped the solids from the settling basin 2. If the screen 17 is pulled out of the settling basin at a predetermined angle (for example, at a nearly horizontal angle) by engaging the contact piece with a guide cam fixedly arranged outside the rotating shaft 13. good.

Further, in the embodiments of the present invention, an example in which the motor 19 is used to drive the rotation of the disk 15 has been described, but in other cases, the rotation of the disc 15 is driven by the gravity of falling sewage, etc., flowing water force, etc., without using a drive source such as a motor. The disc 15 can be driven to rotate.

That is, as shown in FIG. 6, a plurality of radial impellers 30 are rotatably fitted on the rotating shaft 13, and the rotation is caused between the rim 31 of the impeller 30 and the ring 32 concentrically attached to the disk 15. If the pressure contact roller 33 is interposed, the impeller 30 will be rotated clockwise by the hydraulic power of the waste water falling from the saucer 27, and the rotation of the impeller 30 will rotate the disc 15 counterclockwise via the roller 33. Can be rotated in the direction
This provides a device that does not require power from a motor. In this embodiment, three pressure rollers 33 are arranged at equal intervals.
Although an example in which two pressure rollers 33 are provided has been described, the above operation is possible as long as there is at least one pressure roller 33. Further, a gear may be used instead of the pressure roller. In this case, an external gear and an internal gear that mesh with the small gear may be provided on the rim 31 of the impeller 30 and the ring 32 of the disc 15. .

In addition, in the embodiment of the present invention, an example was explained in which the sewage mixture removal device was applied to a septic tank for combined human waste treatment, but in order to discharge domestic wastewater or wastewater from a food factory into a river, etc. It can also be widely applied as a removal device.

Furthermore, when hydraulic power is used as a driving source, in addition to gravity, a water wheel, a turbine, or the like that converts the hydraulic power flowing in a pipe or the like into rotational force can also be used.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of comb-shaped screens are arranged in a circle between two rotating disks,
The solid matter in the wastewater deposited on the screen can be effectively removed by the impact force and the squeezing action of the screen when each screen is reversed due to the gravity associated with the rotating operation. For this reason, there is little chance of solid matter being deposited on the screen instead of being removed. No extra load is applied to the rotating body equipment, and even more, it completely eliminates the possibility of solid matter getting entangled with the rotating shaft and making it unable to rotate, dramatically improving durability and making maintenance management easier. It is extremely facilitated.

[Brief explanation of drawings]

FIG. 1 is a schematic view schematically showing an example in which a sewage mixture removal device according to an embodiment of the present invention is applied to a septic tank for combined human waste treatment, and FIGS. 2 and 3 show a first sewage mixture removal apparatus according to the present invention. A plan view and a side sectional view showing the configuration of the removal device,
4 and 5 are a front view and a side sectional view showing the configuration of a second sewage mixture removal device, and FIG. 6 is a side sectional view showing the configuration of a sewage mixture removal device according to another embodiment of the present invention. It is a diagram. A...First sewage mixture removal device, B...Second sewage mixture removal device, 2...
Sand settling basin, 3... Raw water pump tank, 4... Pumping pump, 5... Flow rate adjustment tank, 6... Pumping pump, 7. Sludge storage tank, 8... 1st contact aeration tank, 9... 2nd contact aeration tank, 10... Sedimentation tank, 12... Sterilizer, 11... Disinfection tank, 13... Rotation Shaft, 14...Bearing plate, 15...Disc plate, 16...Shaft portion, 17...Comb-shaped screen, 19...Motor , 22...Bar 23...Roughing board, 23a...Concave groove, 24...Soil receiving basket, 25...Weir plate, 26... ...Inlet, 27...Saucer, 28...Sewage basin, 29...Outlet, 30...Impeller, 31...Rim, 32 ...Ring, 33 ... Pressure roller. dm wide = A commode 2 Fig. 3 Fig. 4 Fig. 5

Claims (3)

[Claims] (1) The proximal end is rotatably supported by a pair of discs attached to a rotating shaft at a predetermined distance apart, and a plurality of shaft parts arranged at equal angular intervals near the periphery of both discs, a plurality of comb-shaped screens whose free ends have a length that rests on a rear shaft portion adjacent to the shaft portion, and which rotate and move as the disk rotates; and a plurality of comb-shaped screens that rise as the disk rotates. After that, the comb-shaped screens whose center of gravity passes through the shaft part and are inverted due to their own weight collide with each other and apply an impact force to the screen. A squeeze plate is fitted into the gap and squeezes the screen as the disc rotates, and a drive source rotates the disc in a fixed direction via the rotation shaft, When the screen is turned over, the solid matter in the wastewater that has adhered to the screen is shaken off by the impact force that hits the bar, and the solid matter that has adhered to the screen itself is also shaken off by the screen passing through the scrubbing board. A sewage mixture removal device characterized in that it is configured as follows. (2) The sewage according to claim 1, characterized in that an electric motor is used as the drive source, and the rotational force of the electric motor is used to rotate the rotating shaft in a predetermined direction via an appropriate speed reduction mechanism. Mixture removal device. (3) As a drive source, an impeller provided on a rotating shaft is rotated by the gravitational force of sewage or other fallen objects or the hydraulic power of flowing water, and the rotating shaft is rotationally driven in a predetermined direction. The sewage mixture removal device according to claim 1.