JPS614596A - Rotary sewage treating apparatus - Google Patents

Abstract

PURPOSE:To prevent an excessive increase in film thickness and to prevent an oxygen deficiency by forming a rotary plate into a sectorial plate having a specified apical angle, forming the sectorial plate by dividing the circumference of a revolving shaft in equal parts, and arranging plural sets of sectorial plates on a line along the axis of the revolving shaft. CONSTITUTION:Four sectorial plates 2 and 2' are respectively provided, and plural sets of sectorial plates are arranged. The edge sides 3 and 3' and 4 and 4' contg. apical angles of two sets of sectorial plates 2 and 2' are allowed to lie in the same plane, and the edge side 3 of one set and the edge side 3' are bent respectively in the opposite direction. The end surfaces of the edge sides 3 and 3' and 4 and 4' are opposed to each other at different levels, and revolve while following a trajectory different from each other. Consequently, sewage and air are passed through the clearance between both edge sides 3 and 3' and 4 and 4', and mixed with each other.

Description

[Detailed description of the invention] The present invention relates to a rotary sewage treatment device.

When approximately half of the rotating plate is immersed in waste water, the rotating plate is rotated to repeat immersion in waste water and aeration,
Oxygen from the air is absorbed and aerobic microorganisms adhere to the surface of the rotating plate to form a biofilm, and the organic matter in the wastewater is biologically oxidized and decomposed by the action of these aerobic microorganisms, purifying the wastewater. The rotating plate method that applies this is already known.

The biological film that forms on the surface of the rotating plate in the rotating plate method described above is subjected to peeling force due to the flow of wastewater when it is immersed or floats up as the rotating plate rotates, and if the peeling force is excessive, the biological film may If the film is insufficiently formed, the biofilm becomes too thick and cannot absorb enough oxygen from the air and becomes anaerobic, and in either case, the ability to oxidize and decompose is significantly reduced.

The magnitude of the above peeling force is determined by the rotation speed of the rotary plate, so
In order to maintain the desired thickness of the biofilm, it is necessary to set the rotation speed within a range where the desired peeling force is exerted. However, even if the rotating speed of the rotating plate is the same, it is natural that the linear velocity of rotation will be different near the center of the periphery of the rotating plate. Therefore, the larger the diameter of the rotating plate, the larger the difference becomes. It is extremely difficult to attach a biofilm to the desired thickness on the surface of the rotating plates, and the biofilm becomes too thick near the center, blocking the gaps between each rotating plate or becoming anaerobic, causing organic matter to accumulate. There was a risk that the decomposition rate of

In addition, in rotary sewage treatment equipment, each rotary plate is generally mounted perpendicular to the rotating shaft, so even if the rotary plate rotates, it only follows the same trajectory, and the center of the rotary plate The waste water and air in the nearby space are hardly agitated. Therefore, the areas near the center of each space between the rotating plates are not mixed with each other, and this combined with the above-mentioned insufficient linear velocity further promotes blockage near the center, reducing the effective area of the rotating plates. This has been a major cause of reducing the allowable load of the sewage treatment equipment.

In order to eliminate the above-mentioned drawbacks, the present invention uses fan-shaped plates having a required apex angle as rotating plates to mutually mix the sewage and spaces in each space interposed between each rotating plate. This is to prevent shortages.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIGS. 1 and 3 are diagrams for explaining one embodiment of the present invention, and the apex angle of the direction/rotation axis 1 is approximately 180 degrees. The case is shown in which a fan-shaped plate 2.2' is installed.

In the figure, four sets of fan-shaped plates 2..., 2'... are provided, but in an actual device, a large number of these two sets of sector-shaped plates are arranged approximately parallel to each other with narrow gaps between them. ing.

These two sets of fan-shaped plates 2..., 2'...
Edges 3 sandwiching the apex angles as shown in Figures and Figure 3, respectively.
..., 3'... 4..., 4'...
It is fan-shaped and arranged in one plane, and
The edge 3... of one set is the edge 3' of the other set...
They are bent in opposite directions and face each other. The edges of the fan-shaped plates 3..., 3', 1W... and 4..., 4'... face each other with a step difference, and each has a different miraculous effect. Because the sewage and air follow and rotate, both edges 3.3' Questions and 4
．． 4' to be mixed with each other through the gap between them.

Therefore, the greater the number of opposing edges, the better the mixing of waste water and air. Figure 2 shows fan-shaped plates 2..., 2 whose apex angles are approximately 90° after dividing the rotating circumference into four equal parts.
This is an example using four sets of ′ . . . , 2 . . . , 2′ . In this case, the sewage 6 and air are mixed in the surrounding areas 3..., 3'..., 4... 4'.
It is clear that the mixing of waste water and air is that much better, since the number of gaps is twice as large as when the apex angle is 180°.

As described above, according to the present invention, it is possible to mix the sewage and air in each space between the rotating plates near the rotating shaft, which was previously impossible, and the number of gaps between the opposing edges can be reduced. Mixing of waste water and air can be improved by increasing .

FIGS. 4 and 5 are diagrams illustrating the mixing of waste water and air when the fan-shaped plates are arranged in this manner. Air 9 interposed between one fan-shaped plate 2...
is the air 10 interposed between the other fan-shaped plate 2'...
...and communicate with each other near the peripheries 3 and 3'. Therefore, when the sector plates 2.2' rotate, the sewage and air in the space 9 interposed between one sector plate (say 2) abuts against the edge 3' of the other sector plate 2', as indicated by the arrow 7. As shown, it is divided into two parts and moved into the other space 10. However, since the edge 3.3' of the fan-shaped plate 2' is bent, as the fan-shaped plate rotates, a part of the space 9 is forcibly divided into two at that position and pushed out by an amount corresponding to the bend. and is moved to the next space 10.

In addition, the edges 4...4' of the fan-shaped plate forming the space 9
..., the edge of the fan-shaped plate 3..., 3'
If the space 10 is bent by the same amount in the opposite direction, the space 10 will move in the opposite direction by the amount forced out by the edges 3..., 3' and return to its original position. Such movement is carried out continuously during rotation, thereby ensuring sufficient mixing of waste water and air. For convenience, FIGS. 4 and 5 show only the movement of waste water and air, but it goes without saying that the movement shown in FIG. 4 and the movement shown in FIG. 5 are performed simultaneously.

Since such mixing and agitation is performed at all edges and all parts, it is clear that the mixing efficiency of waste water and air is dramatically improved compared to the conventional method.

As explained above, according to the present invention, mixing and agitation of waste water and air is performed through the entire edge of each fan-shaped plate.
Even near the rotation axis, there is no risk of the biofilm becoming too thick or becoming anaerobic. Therefore,
The allowable load capacity is much larger than that of conventional rotary sewage treatment equipment, which is extremely advantageous.

[Brief explanation of drawings]

FIGS. 1 and 2 are side views of the present invention, and FIGS.
The figure shows a case in which a sector plate with an apex angle of 180° is used, and FIG. FIG. 3 is a perspective view of the one shown in FIG. 1, and FIGS. 4 and 5 are explanatory plan views for explaining the present invention in detail. 1...Rotating shaft 2...Sector plate 3.3
' , 4, 4' ......Edge 6...
Sewage surface patent applicant Tom Consultant Co., Ltd.
Toyo Sansho Co., Ltd. Kyokusui Kogyo Co., Ltd. Urban Environment Consultant Co., Ltd. Representative
Person Patent Attorney Kazu 1) Showa・I Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) In a rotary sewage treatment device that purifies the wastewater by rotating a plurality of rotary plates attached to a rotating shaft while immersing a portion of each of the rotary plates in waste water, the rotary plates are attached to a required top. It is formed into a fan-shaped plate having corners, and these fan-shaped plates equally divide the circumference of the rotating shaft, and are composed of multiple sets arranged in large numbers on a line along the axis of the rotating shaft, and furthermore, each set of sector-shaped plates is A rotary sewage treatment apparatus characterized in that opposing edges of the fan-shaped plates are bent in opposite directions with respect to the corresponding other set. (2) The rotary sewage treatment apparatus according to claim 1, wherein the square fan-shaped plate and the corresponding fan-shaped plate of the other set are arranged so that their mounting positions are shifted from each other.