KR102238268B1 - Biological water treatment system with improved power transmission structure - Google Patents

Abstract

Provided is a biological water treatment device with an improved power transmission structure. According to the present invention, the biological water treatment device comprises: an oxygen generator for separating high-concentration oxygen from the air and supplying the oxygen to an oxygen dissolver; the oxygen dissolver for dissolving the high-concentration oxygen supplied from the oxygen generator in a fluid and supplying the oxygen-dissolved fluid to a reactor; the reactor having internal and external spaces, receiving the fluid discharged from the oxygen dissolver, and supplying the received fluid to the oxygen dissolver; and a mixer disposed inside the reactor to induce mixing of the fluid and circulation of the fluid in the reactor. The oxygen dissolver includes a fluid discharge pipe. One end of the fluid discharge pipe is connected to the oxygen dissolver, and the other end of the fluid discharge pipe is inserted into the mixer, so the fluid passing through the oxygen dissolver is discharged. A plurality of nozzles through which the fluid is discharged is formed at an end of the fluid discharge pipe inserted into the mixer. Therefore, the dissolution efficiency of oxygen can be improved.

Description

Biological water treatment system with improved power transmission structure {BIOLOGICAL WATER TREATMENT SYSTEM WITH IMPROVED POWER TRANSMISSION STRUCTURE}

The present invention relates to a biological water treatment apparatus having an improved power transmission structure.

There are water treatment devices for treating wastewater in a variety of ways, and largely, there are water treatment devices using a combination of a physical method, a chemical method, and a physicochemical method. Among these water treatment methods, a biological treatment method, which is a chemical treatment method, is commonly used, and has a feature of relatively low treatment cost.

In the biological water treatment as described above, water treatment is performed by decomposing organic matter by bringing a large amount of microorganisms into contact with wastewater. At this time, oxygen must be supplied to a large amount of microorganisms in order to decompose organic matter. Conventionally, in order to supply oxygen to microorganisms in the reaction tank, a method of directly supplying oxygen from the lower portion of the reaction tank has been used.

When the method of directly supplying oxygen to the reaction tank as described above is used, oxygen droplets are largely formed and most of them are lost to the atmosphere, so that the oxygen actually supplied to the microorganisms has a problem in that the efficiency decreases. Accordingly, the capacity of the oxygen generator for supplying the microorganisms must be very large, and since a large amount of energy to operate the oxygen generator is consumed, there is a problem in that the process cost used for this is very high. In addition, there is a problem in that power for stirring is excessively consumed for sufficient stirring of wastewater and microorganisms in the reaction tank.

As a prior art disclosed in which a biological water treatment device to improve the above problems is disclosed, there is Korean Patent No. 1779487 (registered on September 12, 2017) that was developed and previously applied by the inventor of the present invention. The prior art document discloses a biological water treatment apparatus in which oxygen dissolution efficiency is improved by introducing an oxygen dissolver to mix wastewater and oxygen in advance.

Registered Patent No. 10-1779487 (registered on September 12, 2017)

Embodiments of the present invention are intended to provide a biological water treatment apparatus with an improved power transmission structure.

According to an aspect of the present invention, an oxygen generator for separating high concentration oxygen from air and supplying it to an oxygen dissolver; And dissolving high concentration oxygen supplied from the oxygen generator in a fluid, and supplying the dissolved oxygen fluid to the reaction tank. An oxygen dissolver; and a reaction tank having an internal space and receiving the fluid discharged from the oxygen dissolving machine and supplying the received fluid to the oxygen dissolving machine; And a mixer disposed inside the reaction tank to induce mixing of the fluid and circulation of the fluid within the reaction tank, wherein the oxygen dissolver includes a fluid discharge pipe, and one end of the fluid discharge pipe has the oxygen dissolution A plurality of nozzles which are connected to a device, and the other end of the fluid discharge pipe is inserted into the mixer to discharge the fluid passing through the oxygen dissolver, and discharge the fluid at the end of the fluid discharge pipe inserted into the mixer; Including, a biological water treatment device may be provided.

In the biological water treatment device having an improved power transmission structure according to embodiments of the present invention, fluid can be smoothly circulated in the reaction tank even when a small amount of power device is used. In addition, due to the unique structure of the mixer, the fluid passed through the mixer and discharged has a high flow rate, so that circulation of the fluid may be facilitated. In addition, the high concentration of oxygen generated in the oxygen generator may pass through the fine filter and be provided as small particles to the oxygen dissolver. Therefore, there is an advantage of increasing the dissolution efficiency of oxygen.

1 is a schematic diagram of a biological water treatment apparatus according to an embodiment of the present invention.
2 is a perspective view of a fine particle filter included in the biological water treatment apparatus shown in FIG. 1.
3 is a first embodiment of a mixer included in the biological water treatment apparatus shown in FIG. 1.
Fig. 4 is a second embodiment of the mixer shown in Fig. 1;
5 is a third embodiment of the mixer shown in FIG. 1.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the following embodiments are provided to aid understanding of the present invention, and it should be noted that the scope of the present invention is not limited to the following embodiments. The following embodiments are provided to more fully describe the present invention to a person with average knowledge in the relevant technical field, and detailed descriptions of known configurations that are determined to unnecessarily obscure the technical subject matter of the present invention will be provided. I will omit it.

1 is a schematic diagram of a biological water treatment apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the water treatment apparatus 100 of the present embodiment may include an oxygen generator 110. The oxygen generator 110 may separate oxygen from the air and supply it to an oxygen dissolver 120 to be described later. The oxygen generator 110 may generate a high concentration of oxygen by removing pollutants and nitrogen in the air. Oxygen generated from the oxygen generator 110 may be moved into the oxygen dissolver 120 through a moving line 111 to be described later.

The oxygen generator 110 may include a moving line 111. The moving line 111 may have a tube shape extending to move the high concentration of oxygen generated through the oxygen generator 110 into the interior of the oxygen dissolver 120. Preferably, the moving line 111 is connected to the fine filter 112 disposed inside the oxygen dissolver 120 to allow the high concentration of oxygen generated in the oxygen generator 110 to pass through the fine filter 112. I can.

2 is a perspective view of a fine particle filter included in the biological water treatment apparatus shown in FIG. 1.

1 to 2, the oxygen generator 110 may include a fine filter 112. The fine filter 112 may be illustrated in a cylindrical shape in which a hollow part 112-1 is formed in the center. Preferably, the microfilter 112 may be applied with a membrane filter. A fluid inlet pipe 124 to be described later may be disposed through the hollow portion 112-1 of the fine filter 112. The inner circumferential surface of the hollow part 112-1 and the outer circumferential surface of the fluid inlet pipe 124 are formed to have the same or similar circumference so that the fluid inlet pipe 124 can be sealed when inserted into the hollow part 112-1. For example, a configuration such as packing may be added to the hollow part 112-1 and the fluid inlet pipe 124 to improve sealing force.

A moving line 111 may be connected to a lower portion of the fine filter 112 except for the hollow part 112-1. For example, the end of the moving line 111 may be formed in the same or similar area as the lower portion of the fine filter 112. Accordingly, oxygen having a high concentration formed in the oxygen generator 110 moves along the movement line 111 and flows into the lower portion of the fine filter 112, passes through the fine filter 112, and fine particles of oxygen may be formed.

The water treatment apparatus 100 of the present embodiment may include an oxygen dissolver 120. The oxygen dissolver 120 is connected to the oxygen generator 110, and wastewater containing microorganisms (hereinafter referred to as'fluid') is introduced through the reaction tank 130 to be described later, thereby dissolving a high concentration of oxygen in the fluid. . The oxygen dissolver 120 may be composed of a cylindrical body 122 and an upper cover 121 and a lower cover 123. At the lower end of the lower cover 123, a fluid inlet pipe 124 is penetrated to allow fluid to flow into the oxygen dissolver 120, and a fluid discharge pipe 125 is disposed through the upper cover 121 to provide oxygen. The fluid that has passed through the dissolver 120 may be discharged.

The oxygen dissolver 120 may include an upper cover 121, a main body 122 and a lower cover 123. The body 122 of the oxygen dissolver 120 may be formed in a cylindrical shape with a space therein. Inside the body 122, a plurality of pipes having different diameters may be sequentially disposed from the center. In addition, a plurality of porous rectifying plates may be disposed in the interior of the main body 122 in the transverse direction. An upper cover 121 with a space therein is disposed on the upper part of the porous rectifying plate disposed at the top of the main body 122, and a lower cover 123 is disposed below the porous rectifying plate disposed at the lowermost end of the main body 122. Can be placed. Unlike the main body 122, the upper cover 121 and the lower cover 123 do not have a pipe and a rectifying plate disposed therein.

The oxygen dissolver 120 may include a fluid inlet pipe 124. The fluid inlet pipe 124 may be disposed through the lower part of the lower cover 123. The fluid inlet pipe 124 may be inserted into the lower cover 123 and disposed to pass through the hollow portion 112-1 of the fine filter 112 disposed inside the lower cover 123. The fluid inlet pipe 124 is a pipe through which fluid flows from the reaction tank 130 to be described later into the interior of the lower cover 123. A pump 124-1 is connected to an end of the fluid inlet pipe 124 to allow the fluid in the reaction tank 130 to flow into the oxygen dissolver 120.

The oxygen dissolver 120 may include a fluid discharge pipe 125. The fluid discharge pipe 125 is a pipe that passes through the oxygen dissolver 120 and discharges a fluid containing a high concentration of oxygen back to the reaction tank 130. One end of the fluid discharge pipe 125 may be connected to the upper cover 121, and the other end of the fluid discharge pipe 125 may be partially inserted into the mixer 140 to be described later. Preferably, the fluid discharge pipe 125 may be separately formed as many as the number of mixers 140. That is, as illustrated, when two mixers 140 are disposed inside the reaction tank 130, the fluid discharge pipes 125 are separated into two, and the end of the fluid discharge pipe 125 inside each mixer 140 Can be placed in the insert.

The fluid discharge pipe 125 may include a nozzle 125-1. One or a plurality of nozzles 125-1 may be provided at an end of the fluid discharge pipe 125. The nozzle 125-1 may be disposed to speed up the flow rate of the fluid discharged to the fluid discharge pipe 125. As illustrated, a plurality of nozzles 125-1 are disposed at the lower end of the fluid discharge pipe 125 in four directions along the outer circumferential surface of the fluid discharge pipe 125, but are not necessarily limited to the illustrated external shape.

The water treatment apparatus 100 of the present embodiment may include a reaction tank 130. The reaction tank 130 is exemplified as a space in which a fluid is disposed and a fluid and oxygen are mixed. Preferably, the pump 124-1 may be disposed in the center of the reaction tank 130, and a plurality of mixers 140 to be described later may be disposed on the edge side. In the inside of the reaction tank 130, the fluid must be circulated so that the fluid and oxygen can be stirred smoothly.

The water treatment apparatus 100 of the present embodiment may include a mixer 140. The mixer 140 may serve to increase the flow rate of the fluid so that the fluid can be smoothly agitated with oxygen. As illustrated, a plurality of mixers 140 may be disposed toward the edge of the reaction tank 130. The number of mixers 140 may be variably disposed depending on the size of the reactor 130 and the amount of fluid. Preferably, the mixer 140 is illustrated as a cylindrical structure with open top and bottom.

3 is a first embodiment of a mixer included in the biological water treatment apparatus shown in FIG. 1.

1 and 3, a plurality of mixers 140 according to the first embodiment may be disposed at the edge of the reaction tank 130. The mixer 140 of the first embodiment may be provided with a rotating protrusion 142 on an inner circumferential surface of a cylindrical body 141 having a space therein. A fluid discharge pipe 125 extending from the oxygen dissolver 120 is disposed inside the mixer 140 so that a fluid containing a high concentration of oxygen may flow into the mixer 140.

The mixer 140 of the first embodiment may include a body 141. The body 141 is illustrated as a cylinder having a space therein. The upper and lower ends of the body 141 are formed in an open shape, and a fluid discharge pipe 125 extending from the oxygen dissolver 120 is inserted at the upper end, and the fluid is discharged at the lower end of the reaction tank 130. A flow of fluid may be formed. The upper end of the mixer 140 is formed in an area larger than the area of the fluid discharge pipe 125, so that an extra space exists even after the fluid discharge pipe 125 is inserted. The fluid inside the reaction tank 130 may flow into the extra space.

Preferably, the body 141 may be formed in an inverted conical shape in which the area of the lower portion is narrower than that of the upper portion. Accordingly, the flow rate increases as the fluid descends along the interior of the mixer 140 where the lower area is narrowed.

In addition, the mixer 140 of the first embodiment may include a rotating protrusion 142. The rotation protrusion 142 may be formed inside the body 141. The rotation protrusion 142 may be formed to protrude in a spiral shape along the inner circumferential surface of the body 141. When the fluid moves along the inside of the mixer 140, the rotation protrusion 142 may rotate along the inner circumferential surface of the body 141 and swirl and discharge. Accordingly, the fluid rotates without a separate power device and is discharged to the outside of the mixer 140 at a high speed, so that the fluid can be rotated inside the reaction tank 130. The fluid discharged to the lower portion of the mixer 140 is circulated by changing its direction to the side as it meets the lower end of the reaction tank 130.

Fig. 4 is a second embodiment of the mixer shown in Fig. 1;

Referring to FIG. 4, the mixer 240 of the second embodiment has a double tube structure of an outer tube 241 and an inner tube 242. A plurality of separation blocks 243-1 are disposed in the hollow portion 243 between the outer pipe 241 and the inner pipe 242, so that the hollow portion 243 can be divided into a plurality of spaces. Since the hollow part 243 divided into a plurality of spaces has a plurality of spaces having a narrow area, there is an effect of increasing the velocity of the fluid passing through the spaces.

The mixer 240 of the second embodiment may include an outer tube 241 and an inner tube 242. The mixer 240 is formed in a double tube structure of an outer tube 241 and an inner tube 242, and a fluid discharge tube 125 may be disposed inside the inner tube 242. Preferably, the outer tube 241 and the inner tube 242 are illustrated in an inverted conical shape whose area becomes narrower toward a lower portion than an upper area. Accordingly, as the fluid passes through the area gradually narrowing, the flow velocity may increase. In addition, a hole 242-1 of the inner tube 242 is formed at a position corresponding to the nozzle 125-1 provided in the fluid discharge tube 125, so that the fluid flows into the hollow part 243, which will be described later. I can.

In addition, the mixer 240 of the second embodiment may include a hollow portion 243 and a separation block 243-1. The hollow part 243 illustrates a space between the outer tube 241 and the inner tube 242. A plurality of separation blocks 243-1 may be included in the hollow part 243. Holes 242-1 through which fluid is introduced are present in the hollow part 243 at predetermined intervals, and separation blocks 243-1 may be disposed on both sides of the hole 242-1.

The separation block 243-1 may be formed to extend from the top to the bottom of the hollow part 243. The separation block 243-1 may be disposed from the inner tube 242 between the hole 242-1 and the hole 242-1 to the outer tube 241 as illustrated. Preferably, the separation block 243-1 may be disposed in the vertical, left and right directions based on the end in contact with the inner tube 242.

As above, the mixer 240 of the second embodiment has a double tube structure of the outer tube 241 and the inner tube 242, and the hollow portion 243 is divided into a plurality of separation blocks 243-1. Accordingly, as a structure in which a large number of spaces having a narrow area exist inside the mixer 240, there is an effect that the flow velocity of the fluid is further increased.

5 is a third embodiment of the mixer shown in FIG. 1.

Referring to FIG. 5, in the mixer 340 of the third embodiment, a central shaft 342 may be disposed inside a body 341, and a wing portion 343 may be provided around the central shaft 342. The mixer 340 of the third embodiment may have an effect of agitating a fluid and an effect of increasing a flow rate due to the configuration of the wing portion 343.

The mixer 340 of the third embodiment may include a body 341. The body 341 may be illustrated as a cylindrical structure having a space therein. The upper and lower portions of the body 341 have an open shape, and may be formed in an inverted conical shape in which an area of a lower portion of the body 341 is narrower than that of the upper portion. A fluid discharge pipe 125 is disposed inside the body 341 so that fluid may flow into the body 341.

In addition, the mixer 340 of the third embodiment may include a central axis 342. The central axis 342 is illustrated as a pipe shape extending from the top to the bottom of the body 341. The inner circumferential surface of the central axis 342 may have a predetermined area larger than the outer circumferential surface of the fluid discharge pipe 125. A fluid discharge pipe 125 is inserted into the central shaft 342 so that fluid may be discharged through a hole formed on the surface of the central shaft 342.

The central axis 342 of the present embodiment may include a fixing bar 342-1. The fixing bar 342-1 may be extended and formed at the upper and lower ends of the central axis 342 to be connected and fixed to the body 341. The fixed bar 342-1 serves to maintain a predetermined distance between the central axis 342 and the body 341, and prevents the central axis 342 from flowing inside the body 341 Do it. As illustrated, the fixing bars 342-1 are extended and connected to the upper and lower ends of each of four, but are not necessarily limited to the illustrated appearance.

The mixer 340 of the third embodiment may include a wing portion 343. The wing portion 343 may be integrally formed with the central shaft 342. The wing portion 343 may have a shape in which a spiral member protrudes around the central axis 342. The wing portion 343 may be spaced apart from the inner circumferential surface of the body 341 by a predetermined degree and may not be in contact. The wing portion 343 is rotated according to the inflow of the fluid discharged from the hole of the central shaft 342 and agitates the fluid, and the wing portion 343 may be rotated using the flow velocity of the fluid without a separate power device. .

Looking at the operation of the water treatment device as described above is as follows. The high concentration of oxygen is separated from the oxygen generator and moves along the moving line to the oxygen dissolver. Meanwhile, a fluid in which wastewater and microorganisms are mixed is introduced into the reactor through an oxygen dissolver through a fluid inlet pipe connected to the pump. In the oxygen dissolver, the high concentration of oxygen and the fluid introduced from the reaction tank are mixed with each other and move back to the reaction tank along the fluid discharge pipe connected to the upper cover. At this time, since the fluid discharge pipe is partially inserted into the mixer disposed inside the reaction tank, the fluid passes through the inside of the mixer. The fluid passing through the inside of the mixer has a high flow rate, meets the bottom surface of the reactor, and circulates to the left or right. The fluid circulates inside the reactor and oxygen, microorganisms and wastewater can be better mixed. By repeating the above process, the fluid and oxygen are mixed, and the amount of dissolved oxygen at the desired level can be maintained. At this time, the stirring in the reaction tank may be performed by the flow of the fluid through the mixer without using a separate power device. Even if a separate power device is installed in order to perform the stirring more actively, the stirring can be performed with a lower power than the conventional one.

As described above, in the water treatment apparatus according to the embodiments of the present invention, the power transmission structure is improved, so that the fluid can be circulated in the reaction tank in the direction of the arrow shown in FIG. 1 even when a small amount of the power device is used. A plurality of mixers are arranged at the inner edge of the reactor, and the end of the fluid discharge pipe is partially inserted into the mixer. The fluid containing oxygen is discharged into the mixer through the fluid discharge pipe, and the fluid having a high flow rate is discharged through the lower part of the mixer due to the unique structure and arrangement of the mixer. The fluid discharged through the lower part of the mixer meets the bottom surface of the reaction tank and circulates to the left or right. That is, even though a small amount of power device is used by improving the power transmission structure, due to the unique structure of the mixer, the fluid passed through the mixer and discharged has a fast flow rate, so that the circulation of the fluid can be facilitated.

In addition, the high concentration of oxygen generated in the oxygen generator may pass through the fine filter and be provided as small particles to the oxygen dissolver. Therefore, there is an advantage of increasing the dissolution efficiency of oxygen. As the high concentration of oxygen generated in the oxygen generator passes through the fine filter, fine particles of oxygen may be generated. When large particles of oxygen are introduced, the efficiency of dissolving oxygen into the fluid is low, but the oxygen is introduced into the oxygen dissolver in the form of fine particles, thereby increasing the efficiency of dissolving oxygen into the fluid.

In the above, the embodiments of the present invention have been described, but those of ordinary skill in the art will add, change, delete or add components within the scope not departing from the spirit of the present invention described in the claims. Various modifications and changes can be made to the present invention by means of the like, and this will also be said to be included within the scope of the present invention.

100: water treatment device 110: oxygen generator
111: moving line 112: fine filter
112-1: hollow part
120: oxygen dissolver 121: upper cover
122: main body 123: lower cover
124: fluid inlet pipe 124-1: pump
125: fluid discharge pipe 125-1: nozzle
130: reactor 140: mixer
141: body 142: rotation protrusion

Claims (7)

An oxygen generator 110 for separating high-concentration oxygen from air and supplying it to an oxygen dissolver;
An oxygen dissolver 120 for dissolving the high-concentration oxygen supplied from the oxygen generator 110 in a fluid and supplying the oxygen-dissolved fluid to the reaction tank;
A reaction tank 130 having an internal space to receive the fluid discharged from the oxygen dissolver 120 and supply the received fluid to the oxygen dissolver 120; And
A mixer 140 disposed inside the reaction tank 130 to induce mixing of the fluid and circulation of the fluid within the reaction tank 130; and
The oxygen dissolver 120 includes a fluid discharge pipe 125,
One end of the fluid discharge pipe 125 is connected to the oxygen dissolver 120, and the other end of the fluid discharge pipe 125 is inserted into the mixer 140, so that the oxygen dissolver 120 The fluid that has passed is discharged,
Includes; a plurality of nozzles 125-1 through which fluid is discharged at an end of the fluid discharge pipe 125 inserted into the mixer 140,
The oxygen dissolver 120,
A cylindrical body 122 having an internal space, and in which a plurality of pipes having different diameters sequentially from the center are disposed inside the body 122;
One side is connected to the upper portion of the main body 122, the other side is connected to the fluid discharge pipe 125, the upper cover 121 through which the fluid that has passed through the main body 122 flows out; And
Including; a lower cover 123 connected to the lower portion of the main body 122, through which oxygen and fluid flow through the reaction tank 130 through the oxygen generator 110,
The oxygen dissolver 120 includes a fluid inlet pipe 124,
One end of the fluid inlet pipe 124 is connected to the lower cover 123, and the other end of the fluid inlet pipe 124 is inserted into the reaction tank 130,
Includes; a pump 124-1 capable of pulling up a fluid and introducing a fluid into the lower cover 123 at an end of the fluid inlet pipe 124 inserted into the reaction tank 130,
The oxygen generator 110 includes a fine filter 112,
The fine filter 112 is formed of a cylindrical membrane filter having a hollow portion 112-1 in the center thereof, and the fluid inlet pipe 124 is inserted into the hollow portion 112-1, so that the fluid inlet pipe A fluid is filled in the fine filter 112 and the oxygen dissolver 120 through 124, and the oxygen discharged through the oxygen generator 110 passes through the fine filter 112 filled with the fluid. Thus, a fluid containing fine particles of oxygen may be discharged to the oxygen dissolver 120,
The mixer 140,
It is disposed at an edge close to the wall surface of the reaction tank 130, and is disposed to be spaced apart from the bottom surface of the reaction tank 130, so that the fluid discharged to the lower side of the mixer 140 through the mixer 140 is the reaction tank It may flow into the pump 124-1 disposed in the center of the reaction tank 130 and collide with the wall and bottom surfaces of the 130,
The mixer 140,
The body 341 has an inverted conical shape with a space inside the body 341, and the upper surface of the body 341 and the lower surface of the body 341 are open. );
A central axis disposed in the center of the body 341 and in a pipe shape having a space therein, into which the fluid discharge pipe 125 is inserted, and a plurality of holes are formed on the surface to discharge fluid through the plurality of holes (342);
A fixed bar (342-1) connected between the central axis (342) and the body (341) to fix the central axis (342) and the body (341) to maintain a predetermined distance; And
It is a spiral protruding member, integrally formed on the outer circumferential surface of the central shaft 342, is spaced apart from the inner circumferential surface of the body 341 and does not contact the inner circumferential surface of the body 341, and the surface of the central shaft 342 Containing, a biological water treatment device that can agitate the fluid by rotating by the flow rate of the fluid introduced into the hole formed in. The method according to claim 1,
The mixer 140,
A body 141 having an inverted conical shape having a space in the lower portion of the upper portion and having a space therein, and having an open upper surface and a lower surface thereof; And
Containing, biological water treatment device; a rotating protrusion 142 which is a spiral protrusion formed on the inner circumferential surface of the body 141. delete delete delete The method according to claim 1,
The mixer 140,
The area of the lower part of the outer tube 241 is narrower than the upper part of the outer tube 241 and is inverted conical shape with a space inside, and the upper surface of the outer tube 241 and the lower surface of the outer tube 241 are open The outer tube 241;
An inner tube 242 having a shape similar to the outer tube 241, but having a diameter smaller than that of the outer tube 241;
A plurality of holes 242-1 formed at positions corresponding to the nozzle 125-1 on the surface of the inner tube 242;
A hollow part 243 into the space between the outer pipe 241 and the inner pipe 242, through which fluid flows through the hole 242-1; And
A biological water treatment apparatus comprising; a separation block (243-1) arranged in a plurality of the hollow portion (243) in a vertical direction to separate the hollow portion (243) into a plurality of spaces. delete

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