JPS5814832B2 - Rotating disk device for sewage treatment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating disk device used for wastewater treatment.

When about half of the rotating disk is immersed in waste water and rotated to repeat the immersion in the waste water and aeration, oxygen in the air is absorbed and aerobic microorganisms adhere to the surface of the rotating disk. It is already known that organic matter in wastewater is biologically oxidized and decomposed by these aerobic microorganisms, thereby purifying the wastewater.

In order to apply this method efficiently, it is effective to widen the surface area of the rotating disk, and therefore it is preferable to use a large disk.

However, when large discs are used, aerobic microorganisms attached to the discs may become detached due to increased circumferential speed, especially at the peripheral edges of the discs, and gaps between each disc may become uneven due to curvature of the discs. The resistance of the water increases and eventually the attachment part of the disc becomes loose and becomes unusable.

It is also known that the surface of the disk is press-molded into a corrugated concentrically uneven mountain shape.

Compared to a flat plate, this has the advantage that it does not vibrate, so the biological layer is less likely to peel off, and the surface area also increases.

However, the disk with a corrugated surface increases the load on the disk due to the increase in weight due to the increase in the microbial layer, making it difficult to apply to large disks. It was necessary to increase the thickness of the board or use a stronger material.

It has also been found that when the corrugated shape is semicircular or arcuate, the attached microorganisms are easily peeled off.

The present invention aims to improve such drawbacks, and to provide a device which can fix each disc extremely simply and reliably, and which increases the surface area of the discs. In a rotating aeration tank disc device in which a large number of discs consisting of are fixed concentrically and at right angles to a rotating shaft,
A thick trapezoidal reinforcing rib is provided radially from the center of the disk, concentric square grooves are provided from the center on both the front and back surfaces of the disk, and a through hole is provided on the line of the reinforcing rib. The disk around the through hole is thick and has a protrusion concentric with the through hole, and a recess is provided on the other side, and the protrusions of adjacent disks fit into the recess sequentially. A rotating disk for sewage treatment, characterized in that a number of disks are fixed by tie rods penetrating through the through-hole, and gaps are formed between adjacent disks in areas other than the vicinity of the through-hole. The gist is the device.

The base material used for the rotating disk used in the sewage treatment equipment of the present invention is a thermoplastic resin, especially a foam made of polystyrene or its copolymer resin. The cost is low, and the disks are easy to manufacture.

The rotating disk in the present invention is provided with reinforcing ribs radially from the center, but the number of reinforcing ribs varies depending on the strength of the base material, the size of the disk, etc., and generally there are 4 to 16 reinforcing ribs.
Alternatively, 32 pieces may be provided as necessary.

When the number of reinforcing ribs is large, the reinforcing ribs are brought into close contact with the center of the disk, so the reinforcing ribs may be omitted as appropriate in the rectangular distances close to the center.

The square grooves have a trapezoidal cross section, and are provided in large numbers concentrically from the center of the disk, but the width of the grooves is not particularly limited;
For large discs larger than m, it is about several centimeters to more than ten centimeters.
It is best to provide them at equal intervals across the width.

Further, it is desirable that the thickness of the disk be uniform on the back side of the groove so that square grooves of the same shape are formed on both sides.

When the disk is large, for example with a diameter of 2 m or 3 m or more, it is difficult to transport the disk or the device, so it is recommended that the disk be assembled from 2 to 8 sector plates. is suitable.

In the present invention, the circumference of the through hole is also made thicker in the disk formed by combining such fan-shaped plates, and a protrusion forming a concentric circle with the through hole and a recess into which the protrusion fits are formed. , a large number of disks are firmly connected, making it possible to create an extremely strong device.

The details will be explained below with reference to the drawings.

FIG. 1 is a plan view of a rotating disk 1, in which a hole 2 through which a rotating shaft passes is bored in its center.

Reference numeral 3 denotes reinforcing ribs radially extending from the rotating shaft 31 in a thick, trapezoidal shape.

Reference numeral 4 denotes a through hole bored on the reinforcing rib 3, and as is clear from FIG. A recess 6 into which the protrusion 5 of the adjacent rotary disk 1 fits is provided on the back surface.

Therefore, when the rotating disks 1 are placed one on top of the other, the protrusions 5 sequentially fit into the recesses 6 of the adjacent rotating disks 1 and are combined together, and since the periphery of the through hole 4 is thick, In other parts, gaps 7 are formed between adjacent rotating disks 1.

Similarly to the case of the through hole 4 described above, the hole 2 in the center of the rotating disk 1 has a thick wall around the periphery, and is provided with a protrusion 8 and a recess 9 that are concentric with the hole 2. The discs 1 are formed so as to be sequentially fitted and overlapped.

Numeral 11 is a square groove, and a large number of square grooves are provided concentrically from the center of the rotating disk 1 at equal intervals between the reinforcing ribs 3.

12 is the top of the square groove 11, and the back side of the square groove 11 is similarly formed with the square groove 11 and the top 12. are uniform, and similar square grooves 11 and top portions 12 are formed on the front and back sides.

FIG. 6 shows another example of a rotating disk, in which four sector-shaped plates are combined to form one rotating disk. A hole 2 for the rotating shaft to pass through is formed in the fan-shaped plate 2 in the same way as in the previous example.
A half-split through hole 23 is provided in the side edge 22 of the fan plate 1, and the half-split through holes 23 of the successively arranged sector plates 21 face each other to form one circular through hole 4. .

Through holes 4 are also provided in the center of the fan-shaped plate 21 radially from the center.
is provided.

The through hole 4 has a thick wall around its periphery as in the previous example, and is provided with a protrusion 5 that is concentric with the through hole 4. On the other side, that is, on the back side, there is a rotary disk 1 formed by combining a fan-shaped plate 21. A recess 6 is provided into which a protrusion 5 of an adjacent similar rotary disk 1 fits.

Therefore, when the rotary disks 1 are stacked one on top of the other, the protrusions 5 are sequentially fitted into the recesses of adjacent rotary disks 1 and are integrally coupled.

Thus, the through holes 4 formed by facing the side edges 22 of the fan-shaped plates 21 are such that the through-holes 4 of the adjacent rotary disks 1 are formed by facing the side edges 22 of the fan-shaped plates 21.
1 so as to overlap the through hole 4 not formed in the side edge 22 of the first part.

That is, the fan-shaped plates 21 of the rotary disks 1 that are adjacent in the front and rear directions are arranged so as to be out of phase with each other as shown by the dotted lines in FIG.

In order to use the above-mentioned multiple rotating disks 1 as a sewage treatment device,
As shown in FIG. 5 and FIG.
At the same time, the protrusions 5 in the numerous through holes 4 are fitted into the recesses 6 of the adjacent rotary disks 1 to be integrated.

A rotating shaft 31 passes through the hole 2 provided in the center, tie rods 32 pass through each of the numerous through holes 4, and are fixed with nuts via frames 33 provided at both ends.

By supporting the rotating shaft 31 by the bearing 35 of the water tank 34 and rotating it at low speed, microorganisms, especially aerobic microorganisms, adhere to and proliferate on the surface of the rotating disk 1, and the sewage 36 contained in the water tank 34 is purified. be done.

In the rotary disk 1 formed by combining the sector plates 21 shown in FIG. 6, the protrusions 5 in the numerous through holes 4 are connected to the concave portions 6 of the adjacent rotary disk 1 by fitting the sector plates 21 out of phase. .

Thereafter, it is assembled in the same manner as described above.

As described above, in the rotating disk device for sewage treatment of the present invention, reinforcing ribs 3 are provided on the surface of the rotating disk 1 radially from the center thereof, and square grooves 11 are formed on both the front and back surfaces.
The compressive strength and bending strength of the rotating disk 1 are significantly strengthened, and the surface area of the rotating disk 1 is expanded, which has the advantage that a large amount of microorganisms can be attached.

Furthermore, because of the square grooves, attached microorganisms are difficult to fall off, unlike in the case of arcuate irregularities, and therefore the efficiency of purifying wastewater is good.

Further, a through hole 4 is provided on the reinforcing rib 3 of the rotary disk 1, and the disk around the through hole 4 is made thicker to form a protrusion 5 and a recess 6 concentric with the through hole 4. As a result, the protrusions 5 and recesses 6 of the adjacent rotary disks 1 fit together and are reliably connected, and the through holes 4 are formed in a straight line without adjusting their positions. Therefore, when the tie rod 32 is inserted into the through hole 4, it can be inserted smoothly without experiencing any resistance.

This also applies to the case where the rotary shaft 31 passes through the hole 2 in the center.

Also, the area around the through hole 4 is made thick, and when the tie rods 32 are used to fasten the parts, no gap is formed in the fastened part, so the rotating disk 1 is firmly fixed, and the gap 7 formed between the rotating disks 1 is is held accurately.

Therefore, water resistance does not become uneven, and it can be used stably for a long period of time.

Furthermore, when the rotating disk 1 is formed by combining sector plates 21 to form one rotating disk 1 as shown in FIG. 6, the sector plates 21 cannot be accommodated in a small volume. The disk around the through hole 4 is thick, and the protrusion 5 is concentric with the through hole 4.
Since the recesses 6 and 6 are formed, the protrusions 5 and recesses 6 of the rotary disks 1 adjacent to each other can fit together easily and
Connected securely.

Further, the fan-shaped plates 21 constituting each rotary disk 1 change the phase between the front and rear adjacent rotary disks 1, that is, the fan-shaped plates 21
By connecting the through holes 4 at positions where the side edges 22 of the holes 1 do not overlap, the strength of each through hole 4 fastened with the tie rod 32 and nut is made uniform, and the strength is the same as that of a single disk. Furthermore, if the fan-shaped plate 21 is damaged, only the damaged fan-shaped plate 21 can be replaced and used, which is extremely suitable.

[Brief explanation of drawings]

The drawings show one example of the rotating disk device for sewage treatment of the present invention, and FIG. 1 is a plan view of the rotating disk used in the present invention.
Figures 2 to 5 show the state in which two rotating disks are connected, and Figure 2 is a sectional view taken along the line AA in Figure 1, Figure 3 is a sectional view taken along the line BB in Figure 1, and Figure 3 is a sectional view taken along the line BB in Figure 1. Figure 4 is a sectional view taken along line C-C in Figure 1.
FIG. 5 is a sectional view taken along the line D--D in FIG. 1. FIG. 6 is a plan view showing a part of a rotating disk formed by combining sector plates. FIG. 7 is a schematic explanatory diagram of the apparatus of the present invention. In the drawing. The main codes are as follows. 1...Rotating disk, 2...One hole, 3...
...Reinforcement rib, 4...Through hole, 5, 8...
...protrusion, 6,9... recess, 7...
Gap, 11... Square groove, 12... Top,
21...Sector plate, 22...Side edge, 23
...Half-split through hole, 31...Rotating shaft, 32...Quirod, 33...Frame, 34...Water tank , 35...Bearing, 36
······sewage.

Claims (1)

[Scope of Claims] 1. In a rotating aeration tank disc device in which a large number of discs made of thermoplastic resin foam are fixed concentrically and at right angles to a rotating shaft, A thick trapezoidal reinforcing rib is provided, a concentric square groove is provided from the center on both the front and back surfaces of the disk, and a through hole is provided on the line of the reinforcing rib, and a through hole is provided in the vicinity of the through hole. The disc has a thick wall and is provided with a protrusion that is concentric with the through hole, and a recess is provided on the other side, and the protrusions of adjacent discs fit into the recess one after another and penetrate the through hole. A rotating disk device for sewage treatment, characterized in that a plurality of disks are fixed by tie rods, and gaps are formed between adjacent disks except around the through holes. 2. Each disc is composed of a plurality of fan-shaped plates of the same shape radially assembled, and through-holes are drilled radially from the center on the fan-shaped plate surface, and half-split-shaped through-holes are formed on the side edges of the fan-shaped plate. wherein the half-shaped through holes on the side edges of the sector plates are in contact with each other to form a circular through hole, and the sector plate of the combined disk is out of phase with the sector plate of the adjacent disk. 2. The rotating disk device for sewage treatment according to claim 1, wherein the rotating disk devices are arranged in series so that the protrusions of adjacent disks are successively fitted into the recesses.