JP2507991Y2 - Sewage treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a sewage treatment apparatus.

(Prior Art) FIG. 2 shows a conventional sewage treatment apparatus. This apparatus comprises a cylindrical sludge settling tank 101, a scum box 103 provided on the side wall of the tank 101, and a tank 10 rotating around the center of the tank 101.
A scum skimmer having a rotating arm 107 for guiding the scum 105 (floating matter) on the water surface of 1 to the scum box 103 side by a guide plate 106.
Equipped with 108 and. As shown in FIG. 3C, the scum box 103 is provided with a slope 109 on the scraping side of the scum 105. The end of the rotating arm 107 is connected to the tank 10 via the roller 111.
It moves on the rail 113 of 1, and the slope 109 of the rotating arm 107.
The scum 105 is scraped up along the slope 109 by the rubber plate 115 attached at a position corresponding to, is thrown into the scum box 103, and is discharged from the discharge pipe 117 to the external pit.

(Problems to be solved by the invention) However, in the configuration in which the rubber plate 115 scrapes up the slope 109 in this way, the scum 10 is removed from between the rubber plate 115 and the slope 109.
There is a drawback that part of 5 flows backwards with the wastewater and diffuses back into the wastewater. Further, since only the scum 105 is put into the scum box 103, the fluidity of the scum 105 is low, and the scum box 103 is in a piled state and cannot be smoothly discharged to the pit. Therefore, the accumulated scum
In order to let the scum 105 flow out, it is necessary to provide a water washing mechanism 119 in which water is poured into the scum box 103 to flush the scum 105 at the same timing as the injection of the scum 105.

Therefore, an object of the present invention is to provide a sewage treatment apparatus that can smoothly discharge the scum that has been attracted to the outside of the tank.

[Structure of the Invention] (Means for Solving the Problem) The sewage treatment apparatus of the present invention communicates the scum skimmer for attracting scum floating on the sewage surface of the settling tank to the scum reservoir and the outside of the tank. And a discharge device that discharges the scum of the scum reservoir along with the movement of the scum skimmer to the outside together with the sewage through the discharge path.
The discharge device includes an L-shaped rocking pipe whose one end is connected to the outlet of the discharge passage and the other end is open to the atmosphere, and the opening of this rocking pipe is always higher than the waste water surface. It is characterized in that it is located at a position lower than the sewage surface when interlocked with the scum skimmer.

(Operation) When the scum is scratched by the scum skimmer to the scum reservoir, the discharging device is activated in conjunction with this movement of the scum skimmer, and the scum is discharged to the outside of the tank through the discharge passage. The scum flows out together with the sewage in the scum effluent, so that the scum is discharged smoothly without accumulating on the way.

(Embodiment) A first embodiment will be described with reference to FIG. It should be noted that members that are not numbered in the following description are not shown.

A scum reservoir 5 is provided on the cylindrical side wall 3 side of the sludge sedimentation tank 1 (sedimentation tank). The rotating arm 7 rotates about the center of the tank 1, and the rotating end of the rotating arm 7 is guided by a pulley 9 to a rail 11 of the side wall 3.
Move up. A guide plate 8 is attached to the rotating arm 7 on the water surface of the tank 1 (W.
L.) is fixed so that the lower end is slightly dipped. Rubber 8a, 8b is provided at both ends of the guide plate 8, and is curved so as to recede with respect to the rotation direction toward the outer side in the radial direction, and guides the scum 13 on the water surface to the side wall 3 side with the rotation. To do. A collecting member 10 is fixed to the rotating arm on the outer diameter side of the guide plate 8 and scrapes to the scum reservoir 5. The rotating arm 7, the guide plate 8, the collecting member 10 and the like constitute a scum skimmer 15.

The scum reservoir 5 is composed of a plate portion 6a fixed to the side wall 3 slightly below the water surface and a wall portion 6b protruding from the water surface.
It is shallower than the water surface compared to other places.

The scum reservoir 5 and the outside of the tank 1 are communicated with each other through a bent discharge passage 17 that penetrates the side wall 3. An L-shaped rocking tube 21 is rotatably connected to the tip of the discharge path 17 via a pipe joint 19, and the other end (tip) 21a is open to the atmosphere. Pipe fitting 19
As shown in FIG. 1 (c), the operating rod 23 is fixed at an angle retracted from the swing tube 21 with respect to the direction of rotation of the arrow 25. A rod 23 and a rocking tube 21 are provided between the rod 23 and the side wall 3 by an arrow 27.
A return spring 29 for urging in the rotational direction of is attached. As shown by the solid line in FIG. 1 (c),
In the state of being pulled back by the return spring 29, the tip of the rocking tube 21, that is, the opening 21a faces vertically upward and is above the water surface, and the tip of the rod 23 is a guide rod fixed to the scum skimmer 15.
Above 31. In this case, since the opening 21a is above the water surface (W, L), the clear water is prevented from flowing off until the scum 13 is accumulated. Thus, the discharging device 33 is configured.

Therefore, in FIG. 1 (c), the scum skimmer 15 moves on the rail 11 in the direction of the arrow 35, and the guide bar accordingly.
31 hits the rod 23 and rotates this in the direction of the arrow 25, causing the rocking tube 21 to roll over as depicted by the broken line. By such rocking of the rocking pipe 21, the scum 13 scraped by the scum skimmer 15 into the scum reservoir 5 flows down the discharge path 17 together with the dirty water, and the scum box 39 provided between the tank 1 and the concrete wall 37. And is discharged from the discharge pipe 41 at the bottom thereof. When the scum skimmer 15 passes by, the oscillating force of the return spring 29 causes the oscillating tube 21 to rotate in the direction of the arrow 27 to return to its original position, and thereafter, the rotation of the scum skimmer 15 causes the scum 13 to be scraped and discharged similarly. Be done.

As described above, unlike the conventional example, since the scum is not scraped up by the rubber plate on the slope, the scum that has been scraped does not escape. Since the scum 13 flows down together with the sewage, the scum 13 does not accumulate in the middle of the discharge path 17 and is smoothly discharged to the outside.

If the diameter of the discharge passage 17 is changed or the length of the rod 23 is adjusted to increase or decrease the time during which the oscillating tube 21 rolls over, an appropriate discharge amount can be obtained according to the amount of the scum 13. .

The settling tank is not limited to the sludge settling tank and may be a settling tank for factory wastewater. Also, the tank may be rectangular rather than cylindrical. Therefore, the movement of the scum skimmer may be reciprocal parallel movement instead of rotation.

[Effects of the Invention] As described above, the wastewater treatment device of the present invention does not have a structure for scraping the slope with the rubber plate, so the scum that has been scraped does not escape, and the scum is discharged together with an appropriate amount of wastewater. The whole amount can be discharged smoothly without accumulating in the middle of the road.

[Brief description of drawings]

FIG. 1 relates to the first embodiment, (a) is a cross-sectional view of a main part,
(B) is a view on arrow AA of (a), (c) is a view of B-
FIG. 2 is a plan view showing a conventional example, and FIG.
(B) is a cross-sectional view taken along the line AA of (a), and (c) is a line B- of (a).
It is B sectional drawing. 1,43 …… Sludge sedimentation tank (sedimentation tank), 5,47 …… Scum reservoir,
15 …… Scum skimmer, 17,49 …… Discharge path, 33,57 …… Discharge device

Claims (1)

(57) [Scope of utility model registration request] 1. A scum skimmer for attracting scum floating on the sewage surface of a settling tank to a scum reservoir, a discharge path for communicating the scum reservoir with the outside of the tank, and a scum for the scum reservoir linked to the movement of the scum skimmer. And a discharge device for discharging the sewage to the outside through a discharge path.
An L-shaped rocking pipe, one end of which is connected to the outlet of the discharge passage and the other end of which is open to the atmosphere, is provided, and the opening of the rocking pipe is always higher than the sewage surface. The sewage treatment apparatus is configured so that it is located at a position lower than the sewage surface when interlocked with.