JP2581809Y2 - Rotating device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotary apparatus for simultaneously performing activated sludge treatment and biofilm treatment for sewage treatment.

[0002]

2. Description of the Related Art As shown in FIGS. 7A and 7B, a conventional rotary propeller 1 includes a rotating body 2 and a propeller tank 3. FIG. The rotating body 2 has, for example, six segments 4 arranged in the circumferential direction, and has a driven gear 5 attached to the front near side. The rotating body 2 meshes the driving gear 7 and the driven gear 5 of the driving device 6 attached to the tank 3 with an arrow A.
Forced rotation in the direction. With the rotation of the rotating body 2 in the direction of the arrow A, the tank 3 is moved along the segments 4 and 4.
Are immersed in the processing liquid region B in the tank from the air.

[0003] As shown in FIGS. 8 and 9, the segment 4 is formed by stacking a plurality of unit plates 8 formed of a synthetic resin material, and ends of a long bolt (not shown) penetrating the unit plate 8. An air chamber 9 is formed between adjacent unit plates 8 and 8. Each unit plate 8 has a peripheral wall 8b protruding from a peripheral edge of a substantially fan-shaped plate portion 8a, and an inner arc-shaped portion 8b-1 of the peripheral wall 8b.
An air discharge port 8c is opened in the outer wall 8b of the peripheral wall 8b.
An air inlet 8d is opened at b-2, and a baffle 8e extends from the inner arc portion 8b-1 to the outer arc portion 8b-2 of the peripheral wall 8b. The interior of the air chamber 9 is divided by a baffle 8e of the unit plate 8 into a buoyancy chamber 9a having an air discharge port 8c and an air intake chamber 9b having no air discharge port 8c.

FIGS. 10 (A) to 10 (D) show the rotation state of the rotator 2, and FIG. 10 (B) shows a state rotated by 15 degrees, and FIG. Indicates a state rotated by 30 degrees, and (D) indicates a state rotated by 45 degrees, where the hatched portion indicates air and the portion not hatched with sewage. In the rotating device 1, the rotating body 2 has an arrow A.
When rotated in the direction, air is supplied to the activated sludge present in the sewage C in the tank 3 and the surface of the biofilm adhering to the inside of each segment 4 to perform aerobic microbial treatment.

[0005] That is, when the segment 4 of the rotating body 2 passes over the water surface, the air D flows from the air inlet 8 d to the air chamber 9.
And a certain amount of air D (for example,
(About 6 to 8 liters) into each air intake chamber 9b. The air D introduced into each air intake chamber 9b is gradually compressed by receiving water pressure with the rotation of the rotating body 2, and when the segment 4 moves to the vicinity of the lowermost part, the air D passes through the baffle 8e and gradually moves to the buoyancy chamber 9a. It moves as bubbles.
Most of the air D that has migrated near the lowermost portion is discharged from the air discharge port 8c in the baffle attachment portion to the wastewater C in the tank 3.
And is supplied to the activated sludge present in the sewage C. When the segment 4 passes through the lowermost portion due to the rotation of the rotating body 2, the air D passes through the baffle 8e from the air intake chamber 9b and the air D
Gradually accumulates in the buoyancy chamber 9 a and becomes a buoyancy that assists the rotation of the rotating body 2.

Incidentally, in order to improve the capacity of the activated sludge treatment, it is necessary to increase the amount of oxygen dissolved in the wastewater C. Therefore, in the conventional rotary propeller 1, when the segment 4 passes near the deepest lower part, air is radiated as air bubbles to the wastewater C.

[0007]

However, the air released to the wastewater C is very large bubbles. The reason is that as the rotating body 2 rotates, the air D
Is larger than the baffle 8e, so that the air outlet 8c cannot be made smaller. However, large bubbles have a small surface area per unit volume and rapidly rise in the sewage C.
The amount of oxygen dissolved in the activated sludge is small, and the capacity of activated sludge treatment is limited.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a rotary propeller capable of improving activated sludge treatment capacity.

[0009]

Means adopted by the present invention are a rotating body in which a plurality of segments are arranged in a circumferential direction, and a method in which the segments are immersed from the air into the processing liquid region in the tank as the rotating body rotates. A plurality of unit plates having a peripheral wall protruding from the peripheral edge of the substantially fan-shaped plate portion are overlapped so as to form an air chamber between the unit plates, and each segment has an inner arc shape. An air outlet is opened in the outer wall, an air inlet is opened in the outer arc of each peripheral wall, and each air chamber is baffled extending from the inner arc to the outer arc of the peripheral wall. In a rotary propeller that is divided into a buoyancy chamber having an outlet opening and an air intake chamber not having an air discharge port, a small-diameter bush connected to the air intake chamber may be provided on an inner arc-shaped portion of the peripheral wall of any unit plate. It is that an auxiliary hole has been established.

[0010]

With the rotation of the rotating body, the segments take in air into the air intake chamber and then gradually move downward of the sewage stored in the treatment liquid region in the tank. The air in the air intake chamber is
With this downward movement, the water is compressed under the water pressure and gradually released into the wastewater from the auxiliary holes. The dissipated air becomes fine bubbles because the auxiliary holes have a small diameter. This dispersal of fine bubbles occurs for a long time before and after the segment moves to the vicinity of the bottom. Dispersed fine bubbles, while slowly rising in the sewage,
Dissolve oxygen in sewage. The fine bubbles have a large surface area per unit volume and slowly rise in the sewage, so that the amount of dissolved oxygen in the sewage increases.

When the segment moves to the vicinity of the lowermost portion, a part of the air in the air intake chamber moves through the baffle to the buoyancy chamber in the form of large bubbles. Most of the air that has migrated near the lowermost portion accumulates in the buoyancy chamber and becomes buoyancy that assists the rotation of the rotating body.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The "device of the present invention" will be described based on the embodiment shown in FIGS. The improvement of the present invention device 11 is that the inner arc-shaped portion 18b-1 of the unit plate 18 constituting the segment 14 has
This means that a small-diameter auxiliary auxiliary hole 18f communicating with the air intake chamber 9b is opened.

The configuration of the device 11 of the present invention other than this improvement is substantially the same as that of the conventional device 1. That is, as shown in FIG. 2, a plurality of unit plates 18 formed of a synthetic resin material are overlapped with each other, and nuts are fastened to both ends of a long bolt (not shown) penetrating the unit plate 18 as shown in FIG. And the adjacent unit plates 18, 1
An air chamber 9 is formed between 8. Each unit plate 18 has a peripheral wall 18b protruding from a peripheral edge of a substantially fan-shaped plate portion 18a, an air discharge port 18c is opened in an inner arc portion 18b-1 of the peripheral wall 18b, and an outer arc portion 18b of the peripheral wall 18b. -2
An air inlet 18d is opened at the bottom, and a baffle 18e extends from the inner arc portion 18b-1 to the outer arc portion 18b-2 of the peripheral wall 18b. The inside of the air chamber 9 is provided with a baffle 18e of the unit plate 18 and an air discharge port 18e.
The buoyancy chamber 9a having an opening c and the air intake chamber 9b having no opening of the air discharge port 18c are defined.

The diameter of the aforesaid auxiliary hole 18f is selected within a range of 2.0 to 5.0 mm. The reason for selecting within this range is as follows. That is, the diameter is 2.0 m
If the length is less than m, clogging occurs. Conversely, when the diameter exceeds 5.0 mm, the bubbles become large and the oxygen dissolving ability is reduced, and the amount of air released per unit time increases. Therefore, the air is transferred to the buoyancy chamber 9a through the baffle 18e. Cannot be transferred.

Each segment 14 of the rotating body 12 is
It is not limited to the whole being composed of the unit plates 18, and although not shown, the conventional unit plate 8 and the unit plate 18 having the auxiliary holes 18 f are combined one by one. It is also possible to configure.

The segment 14 of the rotating body 12 is arranged such that air D enters the air chamber 9 from the air inlet 18d when passing above the water surface, and a certain amount of air D enters each air intake chamber 9b when entering below the water surface. Take in. The air D taken into each air intake chamber 9b is gradually compressed by receiving the water pressure with the rotation of the rotating body 12, and is gradually diffused into the sewage C from the small diameter auxiliary hole 18f. The dissipated air becomes fine bubbles E since the auxiliary auxiliary hole 18f has a small diameter. The dispersion of the fine bubbles E is performed for a long time before and after the segment 14 moves to the vicinity of the lowermost portion. Dispersed fine bubbles E, while slowly rising in sewage C,
Dissolve oxygen into sewage C.

The air D in the air intake chamber 9b is
4 moves to a position near the bottom, a part of the baffle 18
e and moves to the buoyancy chamber 9a in the state of large bubbles. Most of the air that has migrated near the lowermost portion accumulates in the buoyancy chamber 9a and becomes buoyancy that assists the rotation of the rotating body 12. Therefore,
The buoyancy of the device 11 can be approximated to that of the conventional device 1.

The inventor of the present invention conducted a test under the following conditions in order to confirm the effect of the device of the present invention, and obtained the results shown in FIGS. (Test conditions) The rotating body 2 (12) has a diameter F
(See FIG. 7) is 4230 mm and segment 4 (14)
Are 8 and the length of segment 4 (14) is 2500 m
m. The amount of air taken into the air intake chamber 9b when each air chamber 9 of the segment 4 (14) goes below the water surface is:
It is 7.8 liters. The welding auxiliary hole 18f has a diameter of 3.0 mm. Depth of the tank 3 (see Fig. 7)
Is 3775 mm.

(Test Results) In FIGS. 4 to 6 showing test results, the abscissa indicates the peripheral speed of the segment 4 (14), and the broken line indicates the result when all the segments 14 in the apparatus of the present invention are constituted by the unit plates 18. The dashed-dotted line shows the result of combining the unit plate 18 having the auxiliary holes 18f and the conventional unit plate 8 for each sheet in the device of the present invention, and the solid line shows the result of the conventional device. Show.

The vertical axis of FIG. 3 shows the power consumption of the motor for rotating the rotating body 2 (12). The vertical axis in FIG. 4 indicates the amount of oxygen per hour dissolved in the water in the tank 3. The vertical axis in FIG. 5 shows the power efficiency obtained by dividing the amount of oxygen per hour by the power consumption. The vertical axis of FIG. 6 shows the oxygen dissolving efficiency, which is the ratio of the amount of oxygen per hour dissolved in water divided by the amount of air per hour fed (containing about 20% oxygen).

[0021]

As described in detail above, the device of the present invention has the following practical effects. Most of the air released from the segment into the sewage can be gradually released as fine bubbles from the auxiliary holes over a long period of time, so that the amount of dissolved oxygen in the sewage is dramatically increased compared to the past. . As a result, the device of the present invention can dramatically improve its processing capability. Dispersion of fine bubbles starts before the segment moves to the vicinity of the bottom, so that the amount of air to be moved to the bottom can be reduced. As a result, in the device of the present invention, the driving energy for rotating the rotating body is reduced, and energy saving can be achieved. When the amount of treated wastewater per hour is the same, the rotating body can be operated at a low speed. As a result, in the device of the present invention, the durability of the bearing portion of the rotating body is improved.

[Brief description of the drawings]

FIG. 1 is a view showing a rotation state of a rotating body in an embodiment of the present invention device, wherein (A) is a reference, (B) is a state rotated by 15 degrees, (C) is a state rotated by 30 degrees, D) is a state rotated by 45 degrees.

FIG. 2 is a perspective view showing a part of a segment in the embodiment of the present invention;

FIG. 3 shows an example of the device of the present invention and test results of a conventional device.
5 is a graph showing a relationship between a peripheral speed of a segment and power consumption.

FIG. 4 shows test results of an embodiment of the present invention apparatus and a conventional apparatus.
6 is a graph showing a relationship between a peripheral speed of a segment and an oxygen supply amount.

FIG. 5 shows an example of the device of the present invention and test results of a conventional device.
It is a graph shown by the relationship between the peripheral speed of a segment and power efficiency.

FIG. 6 shows an example of the device of the present invention and test results of a conventional device.
4 is a graph showing the relationship between the peripheral speed of a segment and the oxygen dissolution efficiency.

7A and 7B show a conventional device, wherein FIG. 7A is a plan view and FIG. 7B is a front sectional view.

FIG. 8 is a perspective view showing a unit plate constituting a segment in a conventional device.

FIG. 9 is a perspective view showing a segment in a conventional device.

10A and 10B show a rotation state of a rotating body in a conventional device, with reference to FIG. 10A, FIG. 10B showing a state rotated 15 degrees, FIG. 10C showing a state rotated 30 degrees, and FIG. This is a state rotated by 45 degrees.

[Explanation of symbols]

 12 Rotating body 14 Segment 18 Unit plate 18a Plate 18b Peripheral wall 18b-1 Inner arc 18c Outlet 18b-2 Outer arc 18d Air intake 18e Baffle 18f Auxiliary Hole 9: air chamber 9a: buoyancy chamber 9b: air intake chamber

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotating body in which a plurality of segments are arranged in a circumferential direction, and a storage tank in which the segments are immersed from the air into a processing liquid region in the tank with rotation of the rotating body, wherein the segments are substantially fan-shaped. A plurality of unit plates each having a peripheral wall protruding from the peripheral edge of the plate portion are overlapped so as to form an air chamber between the unit plates, and an air discharge port is opened in an inner arc portion of each peripheral wall, and each peripheral wall has An air inlet is opened in the outer arcuate part, and each air chamber is a baffle extending from the inner arcuate part of the peripheral wall to the outer arcuate part, and the buoyancy chamber with the air outlet opening and the air outlet opening. In a rotary propeller that is divided into a non-air intake chamber, a small-diameter auxiliary auxiliary hole communicating with the air intake chamber is formed in an inner arc-shaped portion of the peripheral wall of any unit plate. Rotating device.