WO2012077173A1

WO2012077173A1 - Waste water treatment apparatus

Info

Publication number: WO2012077173A1
Application number: PCT/JP2010/071823
Authority: WO
Inventors: 考恭荻野; 克則清水; 歳也福田
Original assignee: 積水アクアシステム株式会社
Priority date: 2010-12-06
Filing date: 2010-12-06
Publication date: 2012-06-14
Also published as: WO2012077173A8; CN103097305B; CN103097305A

Abstract

In an embodiment of this waste water treatment apparatus, the axis of rotation (1) has a hollow interior and is provided with axial end units (13), which comprise multiple ribs (15A, 15B) disposed in parallel with gaps therebetween and a shaft (17) that penetrates said ribs (15A, 15B). The axial end units (13) are attached to the axis of rotation (1) so as to expose the base ends of the shafts (17) to the outside of the axis of rotation (1) while disposing the ribs (15A, 15B) in the internal space of the axis of rotation (1) and disposing the shafts (17) so as to be positioned on the axis line of the axis of rotation (1). The axis of rotation (1) forms a bridge between opposing side walls of the treatment tank (4) via the base ends of the shafts (17).

Description

Sewage treatment equipment

The present invention relates to a sewage treatment apparatus used for biological treatment of sewage.

Conventionally, removal of nitrogen and phosphorus, which are causative substances that cause eutrophication of industrial and household water wastewater, has become an important issue in wastewater treatment.

In particular, aerobic and anaerobic regions coexist in a biofilm, and organic matter oxidation, nitrification, and denitrification reactions are likely to proceed simultaneously, so that simultaneous removal of organic matter and nitrogen can be effectively performed in a single biofilm reactor. It is known that Wastewater oxidation and nitrification proceed effectively as an aerobic treatment performed in the presence of oxygen. On the other hand, denitrification proceeds effectively as an anaerobic treatment in which the supply of oxygen is blocked. Thus, effective wastewater treatment can be efficiently performed by performing both aerobic treatment and anaerobic treatment at the same time.

As an apparatus for industrially performing such wastewater treatment, there is a known sewage treatment apparatus that purifies and drains wastewater by biologically oxidizing, nitrifying, denitrifying, re-aeration, and dephosphorizing the wastewater by the rotating disk method. It has been.

As such a sewage treatment apparatus, there is a sewage treatment apparatus in which a plurality of rotating disks are provided on a rotating shaft with gaps, and each rotating disk is partially immersed in sewage in a treatment tank and rotated.

For example, in the apparatus disclosed in Patent Document 1, a fixed shaft is fixed to both ends of a water tank having a substantially semicircular cross-sectional shape, and a rotating shaft is externally fitted to the fixed shaft. A structure provided with a plate is disclosed. This apparatus supports a rotating disk having a large weight by a thick rotating shaft and drives the rotating disk.

Further, the device disclosed in Patent Document 2 is a single tank uniaxial wastewater treatment device, in which a rotating disk body for wastewater treatment is disposed on the inside and outside on the same axis, and an outer large-diameter rotating disk is provided. The upper side of the body is exposed to air, and aerobic oxidation, nitrification, and re-aeration reactions are performed. At the same time, the small-diameter rotating disk disposed inside the cylindrical timing is completely submerged in the wastewater. An anaerobic denitrification process is performed without air.

In this device, a lid 24 is fastened to an end face of a cylindrical body 22 by a bolt 24a, and a hollow shaft 25 has a flange portion 25a and a bolt / nut 25b at the center of the lid 24 (axial center of the cylindrical body 22). It is fixed by fixing with. Further, the shaft 25 is supported by a bearing 26, and is rotatably passed through the side wall 11a of the tank body 11 with a sealant interposed therebetween, so that the rotating disk 2 rotates in a substantially horizontal state. It has become.

In addition, as a method of attaching the rotating disk to the rotating shaft, conventionally, a synthetic resin fixed plate fitted to the rotating shaft is used, and the same rotating plate made of synthetic resin is arranged around the fixed plate to rotate. Some discs are attached to a fixed plate by heat fusion, and this fixed plate is inserted into a rotating shaft for attachment.

Japanese Utility Model Publication No. 60-83099 Japanese Patent No. 3895818

In the conventional sewage treatment apparatus, the rotating disk shaft is formed by a single shaft that penetrates or spans the tank body, and both ends thereof are supported by bearings provided on the side wall portion of the tank body. It is said that.

In such sewage treatment equipment, durability is one of the major issues. In particular, germs adhere to the rotating disk and its weight increases, and this rotating disk is partially immersed in sewage and rotated, so when the weight on the rotating disk shaft increases, this weight rotates. It may act on the heat-sealed part between the disk and the fixed plate and break. For this reason, strength against a large weight is required, and further improvement is required from the viewpoint of the structure of the rotating disk shaft.

The present invention has been made in view of such a situation, and has a rotating disk shaft structure having high sewage treatment efficiency and excellent strength, and durability including a rotating disk structure that can prevent breakage. An object is to provide an excellent sewage treatment apparatus and an economical sewage treatment apparatus.

In order to solve the above-mentioned problems, a sewage treatment apparatus according to the present invention includes a treatment tank in which sewage to be treated is accommodated, a rotating shaft passed to a side wall facing the treatment tank, and sewage in the treatment tank. A plurality of rotating discs that are partly immersed in the rotating shaft and spaced apart from the rotating shaft, and a drive that supplies a driving force to the rotating shaft to rotate the rotating disc And a sewage treatment apparatus for treating sewage by rotating the rotating disk.

In this sewage treatment apparatus, the sewage treatment apparatus of the present invention has the following characteristic configuration.

That is, the inside of the rotating shaft is hollow, and includes a shaft end unit composed of a plurality of ribs arranged in parallel via a gap and a shaft passing through these ribs. The base end portion of the shaft is exposed to the outside of the rotating shaft, the rib is disposed in the internal space of the rotating shaft, and the shaft is disposed on the axis of the rotating shaft. In the state, it is attached to the said rotating shaft, The said rotating shaft is characterized by passing over the side wall which the said processing tank faces through the base end part of the said shaft.

In the above-described configuration, an insertion hole for inserting the rotation shaft is provided, and a side plate is provided with a sandwiching plate in which flat portions and recesses are alternately provided along the circumferential direction. A plurality of the sandwiching plates are inserted into the outer periphery of the plate, and between the flat portions of the adjacent sandwiching plates, there are a flat disk-shaped rotating disk and a convex portion, and are fitted into the concave portion of the sandwiching plate. It is preferable that the rotating disk provided with the possible bulging part is clamped as a set. Further, in the sandwiching portion in which the bulging portion is fitted into the recessed portion, both the sandwiching plate and the two rotating discs are integrally fused by pressing the heating fusion rod. preferable.

Furthermore, in the above configuration, the outer peripheral shape of the cross section of the rotating shaft and the insertion hole of the holding plate are preferably substantially regular polygons, and may be substantially regular polygons whose corners are rounded.

Since the sewage treatment apparatus according to the present invention has a configuration in which the shaft end unit having the above-described configuration is attached to both ends of the rotating shaft, a rotating shaft with high strength can be obtained. In addition, since a shaft that penetrates the inner space of the rotating shaft is not necessary and the shaft end unit is provided with the shaft, the rotating shaft can be reduced in weight and cost can be reduced.

Furthermore, as a structure for transmitting the rotation of the rotating shaft to the holding plate by making the cross-sectional outer peripheral shape of the rotating shaft and the insertion hole of the holding plate into a substantially regular polygon, the gap between the rotating shaft and the insertion hole is, for example, A structure in which the rotating shaft and the insertion hole are fixed by driving a plate of polyethylene or the like can be employed. With this structure, the rotation of the rotating shaft can be efficiently transmitted to the clamping plate, and the stress applied to the rotating shaft can be reduced, so that the efficiency and durability of the sewage treatment apparatus can be further improved.

In addition, since a flat plate-shaped rotating disk and a rotating disk having a convex portion are sandwiched as a pair between adjacent holding plates inserted into the rotating shaft, two rotating disks Are arranged at substantially equal intervals, and even with a flat rotating disk with a small degree of processing, the treatment area can be increased sufficiently, and the sewage treatment efficiency is high.

Further, the two rotating plates and the sandwiching plate are sandwiched between the flat portions of the sandwiching plate, and are integrally fused by pressing the heat-sealing rod. Since the provided bulging part is fitted in the concave part of the sandwiching plate, it is firmly fixed.

As a result, even if the bacteria are attached to the rotating disk or the rotating disk's force is increased by increasing the diameter of the rotating disk, the rotating disk rotates through the holding plate. Since it is firmly attached to the shaft, it will not be damaged.

It is a front view which shows the sewage treatment apparatus which concerns on embodiment of this invention in a partial cross section. It is sectional drawing which shows an example of the rotating shaft applied to the sewage treatment apparatus which concerns on embodiment of this invention. It is a figure which shows the axial end unit of the rotating shaft seen from the arrow X direction in FIG. It is a perspective view of the shaft end unit applied to the sewage treatment apparatus according to the embodiment of the present invention. It is a front view which shows an example of the clamping board applied to the sewage treatment apparatus which concerns on embodiment of this invention. FIG. 6 is a sectional view taken along line III-III in FIG. 5. It is a front view which shows an example of the fan-shaped board of the rotation disc applied to the sewage treatment apparatus which concerns on embodiment of this invention. FIG. 8 is a cross-sectional view taken along line VV in FIG. 7. It is explanatory drawing which shows the arrangement | positioning state of the clamping board applied to the sewage treatment apparatus which concerns on embodiment of this invention, and a fan-shaped board. FIG. 10 is a cross-sectional view taken along line VII-VII in FIG. 9 and shows a state in which the sandwiching plate and the rotating disk are overlapped.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a sewage treatment apparatus according to an embodiment of the present invention in a partial cross section. FIG. 2 is a cross-sectional view showing an example of a rotating shaft applied to the sewage treatment apparatus according to the embodiment of the present invention. FIG. 3 is a view showing the shaft end unit of the rotating shaft viewed from the direction of the arrow X in FIG. 2, and FIG. 4 is a perspective view of this shaft end unit.

The rotary sewage treatment apparatus according to the embodiment of the present invention includes a semi-cylindrical treatment tank 4 in which sewage to be treated is accommodated. A rotary shaft 1 serving as a center of rotation of the

rotary disks

2A and 2B includes a pipe 31 having a hollow cross section and a substantially square shape,

ribs

15A and 15B arranged in parallel with a gap therebetween, and A shaft end unit 13 including a shaft 17 penetrating the

ribs

15A and 15B is provided. The

ribs

15A and 15B and the shaft 17 are welded. In the shaft end unit 13, the base end portion of the shaft 17 is exposed to the outside of the rotating shaft 1, the ribs 15 A and 15 B are disposed in the inner space of the rotating shaft 1, and the shaft 17 is connected to the axis 30 of the rotating shaft 1. It is attached to the rotating shaft 1 in such a state that it is positioned above. Further, the end surface of the rib 15 A disposed on the most proximal side of the shaft 17 is disposed along the opening end surface of the pipe 31. The pipe 31 and the

ribs

15A and 15B are fixed by bolts in a state in which the balance of the entire rotating shaft is adjusted by centering work.

Further, as shown in FIG. 3, the contact plate 16 is attached to the gap between the end surface corner portion 31A of the pipe 31 and the rib 15A. In this state, the end face of the pipe 31 is welded and further finished by a grinder. With the rotary shaft structure formed in this way, it is possible to obtain a rotary shaft with high strength and reduced weight.

The rotating shaft 1 having such a structure is passed through the proximal end portion of the shaft 17 to the

opposite side walls

7A and 7B of the processing tank 4. Specifically, the base end portion of the shaft 17 of the shaft end unit 13 is supported by the bearings 11 provided on the side walls 7 A and 7 B of the treatment tank 4.

Further, a rotating disk main body 3 is configured on the rotating shaft 1 by attaching rotating disks 2A having convex portions 23 and flat rotating disks 2B with gaps alternately. As described above, the rotating disk main body 3 is supported by the bearing 11 at the base end portion of the shaft 17 of the shaft end unit 13, and each rotating disk 2A... 2A and 2B. It is designed to rotate with the part immersed.

The rotating disks 2A... 2A and 2B... 2B are sandwiched between a pair of

rotating disks

2A and 2B between the flat portions 51 of the sandwiching plates 5. The bulging portion 22 provided at the center side end of the rotating disk 2A... 2A is fitted into the recessed portion 52 of the sandwiching plate 5 and is adjacent to the sandwiching portion between the flat portions 51 as will be described later. The sandwiching plates 5 ... 5 and the

rotating disks

2A and 2B are integrally fused by pressing the heat-sealing rod.

Hereinafter, the present embodiment will be described in more detail with reference to the drawings.

FIG. 5 is a front view showing an example of a clamping plate applied to the sewage treatment apparatus according to the embodiment of the present invention, and FIG. 6 is a sectional view taken along line III-III in FIG.

The sandwiching plate 5 has a disc shape, and on the side surface, flat portions 51 and recessed portions 52 are alternately provided on a circumference equidistant from the center. The flat portion 51 and the recessed portion 52 are formed such that the back side of the flat portion 51 on one side surface is a recessed portion 52 on the other side surface. The insertion hole 53 is a hole for inserting the clamping plate 5 into the rotating shaft 1, the connecting rod pressing hole 54 is a hole for fastening the plurality of clamping plates 5, and the lower hole 58 is heat-sealed. It is a hole.

Further, in order to transmit the rotation of the rotating shaft 1 to the sandwiching plate 5, the outer peripheral shape of the cross section of the rotating shaft 1 and the insertion hole 53 are squares whose corners are rounded.

This clamping plate 5 may use two types of clamping plates in order to face the flat portions 51 of the clamping plates 5 adjacent to each other inserted into the rotary shaft 1, as shown in FIG. In relation to the insertion hole 53, the flat surface portion 51 and the recessed portion 52 are provided so that the flat surface portions 51 face each other with one kind of holding plate 5 by being alternately inserted into the rotary shaft 1 while being reversed. Is preferred.

Further, the sandwiching plate 5 is made of a synthetic resin, and is formed of a hollow material as shown in FIGS. 5 and 6, or a foam having a skin layer, so that it is easy to push the heat-sealing rod. is there.

FIG. 7 is a front view showing an example of a fan-shaped plate of a rotating disk applied to the sewage treatment apparatus according to the embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along line VV of FIG.

This fan-shaped plate 21A has a bulging portion 22 formed at its center side end. The bulging portion 22 is fitted and held in the recessed portions 52 of the holding

plates

5 and 5 adjacent to each other. Further, convex portions 23... 23 are formed on the front and back of the fan-shaped plate 21A. When the rotating disk 2A and the plate-shaped rotating disk 2B configured by the fan-shaped plate 21A are arranged as a set, they are adjacent to each other. The convex portion of the matching sector plate 21A and the flat rotating disk 2B come into contact with each other to hold the gap. This fan-shaped plate 21A is preferable because it has a corrugated shape in which grooves are alternately formed on the front and back surfaces in the circumferential direction, since the surface area is increased and the rigidity is increased. Further, it is preferable to form such grooves in the radial direction for the above reasons.

The fan plate 21A is provided with a pilot hole 24A for heat fusion. On the other hand, the fan-shaped plate 21B that forms the rotating disk 2B is a flat plate having the same size as the fan-shaped plate 21A, and is provided with only a pilot hole 24B for heat fusion.

In this embodiment, the fan-shaped

plates

21A and 21B are arranged so as to form a circle between the flat portions 51... 51 of the sandwiching plates 5. Are sandwiched in the recessed portion 52, and the sandwiching plates 5 ... 5 and the

rotating disks

2A, 2B are fused by pressing the heat-sealing rod to form the rotating disk body 3.

As shown in FIG. 9,

fan plates

21A and 21B are arranged in the circumferential direction around the sandwiching plate 5 so as to be fused with the

rotating discs

2A and 2B sandwiched between the sandwiching plates 5. The bulging portions 22 at the center side end portions of the fan-shaped plates 21A are fitted and overlapped with the recessed portions 52 of the sandwiching plates 5 by shifting half by half. As shown in FIG. 10, another sandwiching plate 5 is overlapped with the planar portion 51 of the sandwiching plate 5 so that the planar portions 51 face each other.

Next, a set of fan-shaped

plates

21A and 21B is overlapped thereon in the same manner, and then the planar portion 51 of the sandwiching plate 5 to be superimposed next faces the planar portion 51 of the sandwiching plate 5 that has been previously superimposed, and the sector-shaped plate 21A. , 21B are stacked so as to sandwich.

In this way, a certain number of stacked plates are tightened from both sides with bolts and nuts using the connecting rod pushing holes 54 of the clamping plate 5, and the

rotating disks

2A, 2B are sandwiched between the clamping plates 5 ... 5. It is a unit that sandwiches the set, and it is easy to fuse the sandwiching plates 5 ... 5 that are adjacent to each other in the sandwiching portion between the flat portions 51 of the sandwiching plates 5 ... 5 and the

rotating disks

2A, 2B sandwiched therebetween. It is a simple method. For this fusion, it is only necessary that the sandwiching plates 5 ... 5 and the

rotating disks

2A, 2B on both sides are integrated in the sandwiching portion, and when the sets of

sector plates

21A, 21B are stacked on the sandwiching plates 5 ... 5. Although it may be performed, it is a unit as described above, and as shown in FIG. 10, if it is performed by inserting the heat fusion rod 6 in the sandwiching portion, it is possible to fuse a plurality of upper and lower portions at once, A plurality of heat fusion rods can be used to efficiently fuse a plurality of locations simultaneously.

When the heat-sealing rod 6 is pushed through the sandwiching portion, the sandwiching plate 5 and the rotating disc 2A are melted by the heat to form a hole, and the sandwiching plate 5 and the rotating disc 2A are integrally formed at the periphery of the through-hole. Heat-sealed. Further, in the clamping portion, pre-holes 58, 24A, 24B for heat fusion are previously formed in the clamping plate 5 and the

rotating disks

2A, 2B, and the heat fusion having a diameter slightly larger than the diameter of the lower hole is made in the lower hole. If the rod is inserted, it can be fused more efficiently. In addition, when the fan-shaped plate 21A is overlapped on the sandwiching plate 5 and the

rotary discs

2A, 2A, 2B, and 2B are sandwiched between the sandwiching plates 5 ... 5, positioning is accurately performed using this pilot hole. Can be done.

The rotating disk main body 3 assembled in this way is inserted into the rotating shaft 1, the connecting rod 55 is passed through the insertion hole 54, and the side plate 56 is in contact with both side ends, and tightened with the tightening nut 57. Thus, the sewage treatment apparatus of the present embodiment can be obtained.

Further, it is preferable that the

rotating disks

2A and 2B adjacent to each other are bonded or fused at their contact portions, because the rigidity of the rotating disk body 3 is increased. For example, the convex portion 23 of the sector plate 21A and the sector plate 21B may be bonded or fused. In particular, in the case where the fan-shaped plate 21A is made of a synthetic resin sheet, by pressing the rotating disk 2A and the rotating disk 2B that are stacked after the unit is formed and inserting the heat-sealing rod into the position of the convex portion 23, It is simple and desirable to perform fusion in the same manner as the thermal fusion between the clamping plate 5 and the rotating disk 2A.

The fan-shaped plate 21A is provided with two or more bulged portions 22, and when each bulged portion 22 is fitted and held in the recessed portion 52 of the holding plate 5, the holding plate of the fan-shaped plate 21A. 5 is preferable because the fixing to the plate 5 becomes stronger and the attachment position of the fan-shaped plate 21A to the holding plate 5 is determined.

Further, in the

rotating disks

2A and 2B adjacent to each other, when the fan-shaped

plates

21A and 21B are bonded in a state of being shifted by half in the circumferential direction, they are integrated in the circumferential direction, and the rotating disk main body 3 is integrated. The strength of the is improved, which is preferable.

The fan-shaped

plates

21A and 21B constituting the

rotating disks

2A and 2B may be 30 ° or 45 ° when the diameter of the rotating disk is large, and 120 ° or 180 ° when the diameter is small.

Further, it is preferable to form the fan-shaped

plates

21A and 21B by synthetic resin thin plates such as polyvinyl chloride thin plates and polyethylene resin thin plates by vacuum forming or pneumatic forming because they are easy to form and process, and are lightweight and inexpensive. .

Next, a drive mechanism for driving the

rotating disks

2A, 2B,... 2A, 2B having the above configuration will be described with reference to FIG.

First, a sprocket wheel 41 is attached to the shaft end unit 13 of the rotary shaft 1, and the sprocket wheel 41 is connected to a chain 43. The sprocket wheel 41 and the chain 43 are attached to a drive shaft 42 of a variable speed reducer 40 that is directly connected to the motor 44. In this drive mechanism, the rotation of the motor 44 is decelerated by the variable speed reducer 40. The drive shaft 42 transmits this reduced rotation to the rotary shaft 1 via the sprocket wheel 41 and the chain 43. The

rotating disks

2A, 2B... 2A, 2B attached to the rotating shaft 1 are rotated by the rotation of the rotating shaft 1.

In the present embodiment, the shaft end unit 13 has a configuration in which two ribs are arranged. However, the configuration is not limited to two, but may have a configuration of three or more. In this case, the weight of the shaft end unit is increased, but the strength of the rotating shaft is further improved.

Further, the end surface of the rib 15A arranged on the most proximal side of the shaft 17 is arranged so as to be along the opening end surface of the pipe 31, but the end surface of the rib 15A is arranged inside the opening end surface of the pipe 31. It may be a structure.

As described above, in the sewage treatment apparatus according to the present embodiment, the shaft end unit having the above-described configuration is attached to both ends of the rotation shaft, so that a rotation shaft having excellent strength can be obtained. . In addition, since a flat plate-shaped rotating disk and a rotating disk having a convex portion are sandwiched as a pair between adjacent holding plates inserted into the rotating shaft, two rotating disks Are arranged at substantially equal intervals, and even with a flat rotating disk with a small degree of processing, the treatment area can be increased sufficiently, and the sewage treatment efficiency is high.

Further, the two rotating discs and the sandwiching plate are sandwiched between the flat portions of the sandwiching plate, and are integrally fused by pressing the heat-sealing rod, and have a convex portion. Since the plate is provided with a bulging part and fitted into the recessed part of the clamping plate, it becomes firmly fixed, so that bacteria adhere to the rotating disk or increase the diameter of the rotating disk Thus, even if the force acting on the sandwiching plate of the rotating disk increases, the rotating disk is firmly attached to the rotating shaft via the sandwiching plate and is not damaged.

The present invention can be implemented in various other forms without departing from the spirit or main features thereof. For this reason, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

The rotating disk type sewage treatment apparatus of the present invention is beneficial in that it is a sewage treatment apparatus having high sewage treatment efficiency and excellent durability, and has a large economic effect due to cost reduction associated with weight reduction of the rotating shaft. . The apparatus of the present invention can be expected to contribute more than ever in the field of wastewater and wastewater treatment.

DESCRIPTION OF SYMBOLS 1

Rotating shaft

2A, 2B Rotating disc 3 Rotating disc main body 4 Processing tank 5 Clamping plate 6 Heat-sealing

rod

7A, 7B Processing tank side wall 11 Bearing 13

Shaft end unit

15A, 15B Rib 17

Shaft

21A, 21B Fan-shaped plate 22 Expansion Protruding portion 23

Convex portions

24A, 24B Lower hole 30 Axis 31 Pipe 51 Flat portion 52 Recessed portion 53 Insertion hole 58 Lower hole 40 Reversible transmission 41 Sprocket wheel 42 Drive shaft

Claims

A treatment tank in which wastewater to be treated is accommodated, a rotating shaft passed to the opposite side walls of the treatment tank, a state where a part of the wastewater is immersed in the wastewater accommodated in the treatment tank, and the rotating shaft A plurality of rotating discs attached at intervals, and a driving means for supplying a driving force to the rotating shaft to rotate the rotating discs, by rotating the rotating discs, In a sewage treatment apparatus for treating sewage,
The inside of the rotating shaft is hollow,
A shaft end unit comprising a plurality of ribs arranged in parallel with a gap and a shaft penetrating these ribs,
The shaft end unit is configured such that the base end portion of the shaft is exposed to the outside of the rotating shaft and the rib is disposed in the inner space of the rotating shaft, and the shaft is placed on the axis of the rotating shaft. It is attached to the rotary shaft in a state where it is positioned.
The sewage treatment apparatus, wherein the rotating shaft is passed to a side wall facing the treatment tank via a base end portion of the shaft.
The sewage treatment apparatus according to claim 1,
An insertion hole for inserting the rotation shaft is provided, and a side plate includes a clamping plate in which plane portions and recessed portions are alternately provided along the circumferential direction.
A plurality of the sandwiching plates are fitted on the outer periphery of the rotating shaft, and between the flat portions of the adjacent sandwiching plates, there are a plate-shaped rotating disk and a convex portion and a recessed portion of the sandwiching plate. And a rotating disk provided with a bulging part that can be fitted to the pair,
In the holding part in which the bulging part is fitted into the recessed part, both the holding plates and the two rotating disks are integrally fused by pressing a heating fusion rod. Wastewater treatment equipment.
In the sewage treatment apparatus according to claim 2,
The sandwiching plate and the rotating disk in the sandwiching part are provided with a pilot hole for heat fusion, and the sandwiching plate and the rotating disk are heat-sealed at the periphery of the prepared hole. Sewage treatment equipment.
In the sewage treatment apparatus according to claim 2 or 3,
The sewage treatment apparatus according to claim 1, wherein the outer circumferential shape of the rotary shaft and the insertion hole of the clamping plate are substantially regular polygons.
In the sewage treatment apparatus according to claim 2 or 3,
The sewage treatment apparatus according to claim 1, wherein the outer peripheral cross-sectional shape of the rotating shaft and the insertion hole of the clamping plate are substantially regular polygons whose corner portions are rounded.