JPS6036837B2 - Sewage purification equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewage purification device that roughly combines a sedimentation tank and a rotating disk contact tank.

In the method of purifying wastewater using a rotating disc, the lower part of the disc rotates at a slow speed and is submerged in the wastewater, while the upper part comes into contact with air, allowing microorganisms to grow on the surface of the disc. The contact effect of the microorganism coating is large, and the microorganisms have excellent features such as sufficient contact with oxygen. However, it is difficult to downsize the disks due to the large diameter and large number of disks, and there is a problem in that installing the disk contact tank and the sedimentation tank side by side requires a considerable amount of equipment space. . In addition, there is an invention described in JP-A-49-124857 in which a rotating disk contact tank is provided above a rectangular sedimentation tank, but in such a system, the sedimentation tank itself becomes the largest. Another problem is that the sedimentation tank and the rotating disk contact tank share a common water surface, resulting in poor sewage purification efficiency.

In view of the above-mentioned problems, the present invention provides a rotating disk contact tank above the sedimentation tank, and the details thereof are as follows.

In the figure, 1 is a circular sedimentation basin, 2 is a vertical rotating shaft provided at its center, and this shaft 2 is driven in a fixed direction by a drive device 3 consisting of a motor, a speed reducer, etc.

Reference numeral 4 denotes an arm fixed to the lower end of the rotating shaft 2, and a scraper plate 6 is fixed to the lower side of this arm 4 for scraping the settled sludge settled at the bottom of the settling tank 1 into the central sludge reservoir 5. A sludge drawing pipe 7 is provided in the sludge reservoir 5.

Further, a plurality of columns 8 are provided on the arm 4, and a scum discharge section (not shown) is provided at the upper end of the column 8 to remove scum floating on the water surface.
Attach the scum schema 9 to be collected. Reference numeral 10 denotes a cylindrical center well with an open top and bottom provided at the center of the upper part of the sedimentation tank 1, and a rotating disk contact tank 11 is arranged on the outside of the upper part of the center well 10. In the illustrated example, there are four tanks 11. 4
It is located on the side.

Each tank 11 is installed between the outer upper part of the center well 10 and the peripheral wall of the sedimentation tank 1.A horizontal rotating shaft 12 is attached to each tank 11, and each shaft 12 is driven by an appropriate drive device 13. Rotate at low speed. Further, each rotating shaft 12 has a large number of discs 14 fixed at regular intervals.
Further, an annular gutter 15 surrounding each tank 11 is provided, a sewage inflow pipe 16 is attached to a part of the annular gutter 15 to introduce wastewater into the annular gutter 15, and an overflow pipe for each tank 11 is provided inside the annular gutter 15. 17 is provided so that the sewage in the gutter 15 flows from the weir 17 to each tank 11.
It is designed to flow inside.

Moreover, an overflow weir 18 communicating with the center well 10 is provided at the inner end of each tank 11, and the wastewater that has come into contact with the disk 14 in the tank 11 flows into the center well 10 from the weir 18. In addition, a saucer 19 is provided in the center well 10, and the wastewater that has overflowed the weir 18 is received by the saucer 19.
It overflows from the saucer 19 and flows into the sedimentation tank 1. Normally, sewage that flows into the settling tank flows sideways or upwards into the center well, taking care not to disturb the settling of sludge in the settling tank, but this time it flows downward into the center well and flows into the center well. There is a possibility of a fly infestation due to falling water. In order to prevent such problems, the shock is softened by placing it in the saucer 19 once. Incidentally, an overflow trough 20 for overflow trough 20 and a weir plate 21 for preventing scum from flowing into the trough 20 are provided on the inner periphery of the upper part of the sedimentation basin 1, and the trough 20' is provided with an outflow pipe 22 for overflow turbidity. establish.

The present invention has the above structure, from the inflow pipe 16 to the annular gutter 15.
The wastewater introduced into the tank flows into each disc contact tank 11 from each overflow weir 17 on the inner periphery. The wastewater flowing into each weir 11 comes into contact with the microbial film attached to the outer surface of each disc 14 rotating at a slow speed, is purified, and flows from the overflow weir 18 at the inner end to the receiving tray 1.
9 and enters the settling tank 1 through the center well 10. Heavy solids in the sewage that has flowed into the settling tank 1 settle and are scraped into the sludge basin 5 by the scraper plate 6 and pulled out by the drawing pipe 7, and the scum that floats up is scraped up by the scum schema 9 and turned into scum. It is discharged from the discharge section. Further, the overflow water flows into the overflow trough 20 and flows out from the outflow pipe 22. As described above, the present invention introduces sewage that has not yet flowed into the settling tank into the rotating disk contact tank, and the sewage that has been oxidized by contact with the microbial film on the disk surface flows into the settling tank and causes the sludge to settle. Since the separation is carried out, the treatment effect of wastewater is significant, but in the case of the present invention in particular, a plurality of independent rotating disk contact tanks are arranged radially above the circular sedimentation tank. , since it can be installed using an existing circular sedimentation tank, the space above the sedimentation tank, which was previously unused, can be used effectively. This can be installed in a much smaller space than when a rotating disk contact tank is provided above the inside of a rectangular sedimentation tank.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the apparatus of the present invention, and FIG. 2 is a plan view of the same. 1...Sedimentation basin, 2...Rotating shaft, 5...Sludge reservoir, 6
...Scraper Blade, 9...Scum Schema, 10
... Center well, 11 ... Rotating disc contact tank, 12 ... Rotating shaft, 14 ... Disc. Figure 1 Figure 2

Claims (1)

[Claims] 1 A cylindrical center well and a rotating shaft are installed in the center, and this rotating shaft is equipped with a scraper blade that scrapes the settled sludge to the sludge reservoir in the center of the bottom, and a scum schema that scrapes the floating scum to the scum discharge section. In a sewage purification device in which a rotating disk contact tank is provided above a settling tank, a circular annular gutter having a wastewater introduction pipe is provided concentrically above the outer periphery of the settling tank, and a plurality of rotating disk contact tanks are connected to the center from the annular gutter. By arranging it toward the top of the well, the sewage that has flowed into the annular gutter will flow into the center well via the rotating disk contact tank, and the sewage flowing down from the rotating disk contact tank will be placed in the lower part of the center well. A sewage purification device equipped with a saucer that receives water and overflows it into a circular sedimentation tank.