KR102036261B1 - Agitators with Function for Equalization of Mixing Power and Reactors, Water Treatment Plants with using those - Google Patents

Abstract

The present invention relates to a stirring apparatus having a stirring power equalizing function, and reaction and water treatment apparatuses using the same. The stirring apparatus of the present invention comprises: a fluid flowing means having a driving unit, a rotary shaft, and a rotary vehicle, and flowing a fluid; a tubular flow path installed at a discharge part of the fluid flowing means, and having both open sides; a stirred water current distribution port including an opening part formed between the discharge part of the fluid flowing means and the tubular flow path; and a stirred water current ejection port including the opening part of an end of the tubular flow path. The water current discharged from the fluid flow means is divided and discharged by a predetermined flow rate through the stirred water current distribution port and the stirred water current ejection port, and is transferred, spaced, and discharged as much as the length of the tubular flow path. The water treatment apparatus of the present invention comprises a reaction apparatus including at least one reactor which occurs a reaction while the fluid is introduced, remained, and discharged, and an aerator for aerating a reaction solution in the reactor to dissolve oxygen. Also, the water treatment apparatus further comprises a solid-liquid separation apparatus for separating a solid and a fluid, and can be operated by selecting various operation modes.

Description

Agitators with Function for Equalization of Mixing Power and Reactors, Water Treatment Plants with using those}

The present invention relates to a stirring device, a reaction device and a water treatment device, and more particularly, a stirring device having a stirring power equalization function and a reaction using the same, which improves the reaction efficiency by improving the generation and distribution of the stirring power evenly in the reactor. A device and a water treatment device.

Stirrers are provided in reactors such as sewage treatment plants, water treatment plants, and production processes in which materials are mixed, decomposed and synthesized through biochemical or physicochemical reactions. The stirrer serves to flow the reaction liquid by driving and rotating a rotor provided with a vane blade, thereby shortening the reaction time and improving the reaction efficiency.

The strength of the stirring force generated in the stirrer and the distribution of the stirring force are very important in the flocculation reactor, food fermentation tank, and biochemical reactor of sewage treatment plant. In particular, when the agitation force is insufficient in the biological reactor of the sewage water treatment facility, the reaction efficiency is reduced, and the reactor capacity is large, and organic matter or microorganisms are deposited on the bottom of the reactor, thereby decaying. On the other hand, if the agitation force is excessively excessive, the formation of the microbial flocs (Bio Floc) may not be smooth in the sedimentation basin, which is a subsequent process, and the pin flocs may be leaked.

 According to the types of reactions such as biochemical reactions, neutralization reactions, agglomeration reactions, adsorption reactions, and mixing processes that are applied in sewage treatment plants and water treatment plants, it is possible to generate a stirring force of an appropriate strength without oversufficiency evenly throughout the reactor. Of course, the economics of facility and power costs are also important.

1 is a conceptual diagram showing a flow rate distribution of a reactor equipped with a conventional general stirrer.

As shown in FIG. 1, when the stirrer 2 installed in the reactor 1 is operated, a high speed flow is generated in the rotary difference 3 of the stirrer 2, so that a strong stirring force is generated near the stirrer 2. Is generated. However, the generated agitated water flow is diffused in the reactor 1 as it moves away from the rotary difference 3, and the flow rate is drastically reduced by the viscosity and resistance of the reaction solution, so that the agitation force is also reduced accordingly. Thus, in the conventional stirrer 2, since the stirring force is concentrated in the vicinity of the rotor 3, the problem that a floc disassembles by strong stirring force may arise. On the other hand, the stirring strength is sharply lowered at the position away from the rotor wheel 3. As such, the conventional general stirrer is inevitably imbalanced in the stirring force in which the stirring force in the reactor 1 is biased.

As described above, in the reactor 1 to which the conventional stirrer 2 is applied, the agitation force becomes excessive due to the rapid flow rate near the rotor wheel 3, and when it moves away from the rotor wheel 3, the flow velocity rapidly decreases, so the stirring force is decreased. This problem is more pronounced in sewage treatment plants equipped with a large rectangular water tank reactor (1). When the flow of the water flow generated in the conventional general stirrer 2 is represented by the constant velocity distribution curve, as shown in FIG. 1, the flow velocity is very fast in the vicinity of the constant velocity distribution curve 4 close to the stirrer, but is separated from the stirrer 2. As the flow velocity decreases toward the constant velocity distribution curve 6 farther from the stirrer 2 past the middle isotropic velocity curve 5 of the position, the agitation force may not work properly in the vicinity of the opposite wall. have. In order to solve this problem, a method of increasing the power of the stirrer or arranging a plurality of stirrers having a small unit power at regular intervals can be raised.

However, when the power of the stirrer is increased so that the stirring force can be transmitted to a distant place, the agitation strength near the rotor wheel is excessively excessive, causing problems such as floc dismantling, and it is uneconomical in terms of facility cost and power cost. In addition, in the case of distributing a plurality of agitators with small unit power so that the agitation force is equally generated in the entire reactor 1, the construction cost and maintenance cost are increased, and the number of driving units and the additional equipment such as electric instrumentation are increased. This makes maintenance difficult.

In addition, the stirrer to which the “agitator blade for water treatment” applied in Korea and registered in Korean Patent No. 10-0436248 is applied to bend a rectangular metal plate in multiple stages to form a rotary difference of the stirrer. It is just a suggestion of the shape of the stirrer blade that can not be contributed and the manufacturing process is simple and easy to manufacture.

As such, the conventional stirrer has a problem in that the stirring force is concentrated such that the stirring force is concentrated around the rotor and away from the rotor.

Patent number 10-0436248

The present invention is to improve the problems of the conventional stirrer of the prior art, an efficient stirring device to prevent the stirring force is biased on one side of the reactor and to distribute the stirring power evenly and improve the performance by using the same It is an object of the present invention to provide a reactor and a water treatment system.

In order to achieve the object of the present invention as described above, the stirring device with a stirring force equalization function according to the present invention, the drive unit and the rotating shaft and the rotation difference is provided with a fluid flow means for flowing the water and the discharge portion of the fluid flow means A stirring water flow dispensing port comprising a tubular flow path installed at the side and opening at both sides, and an opening formed between the discharge portion of the fluid flow means and the tubular flow path and an opening at the end of the tubular flow path. It includes, and the water flow discharged from the fluid flow means is divided by a predetermined flow rate through the stirring water flow distribution port and the stirring water flow outlet is discharged, it is composed of a configuration that is discharged and discharged by the length of the tubular flow path.

 In the stirring device having a stirring force equalization function according to the present invention, the driving unit, the rotating shaft and the rotation difference, the fluid flow means for flowing the water body and both sides are open and two or more stages disposed on the discharge side of the fluid flow means An agitated water flow distributor comprising an opening formed between a multi-stage tubular flow path and an outlet portion of the fluid flow means and the tubular flow path disposed on the discharge part side, and an opening formed between a previous stage tubular flow path and the previous stage tubular flow path; A final step of the tubular flow path comprises a stirring water flow outlet consisting of the opening portion, the water flow discharged from the fluid flow means is divided by a predetermined flow rate through the stirred water flow distribution port and the stirring water flow outlet is discharged, the tubular It consists of a configuration that flows out and transported by the length of the flow path.

The stirring device with a stirring force equalization function according to the present invention is provided with at least one side of a fluid flow means for flowing a water body and a suction part and a discharge part of the fluid flow means, including a driving part, a rotating shaft, and a rotation difference, and the other side. It includes the open tubular flow path, the water flow sucked by the fluid flow means is configured to be discharged by being transported and spaced apart by the length of the tubular flow path.

In addition, the stirring device with a stirring force equalization function according to the present invention, further comprises a swirl flow preventing plate for converting the rotational water flow into a straight stream, the swirl flow prevention plate, the tubular shape disposed close to the fluid flow means It is comprised by the plate shape provided so that it may protrude in at least one side surface among the outer side surface of a flow path inlet side, and the inner side surface of the inlet side of the said tubular flow path.

In the stirring device with a stirring force equalization function according to the present invention, the stirring water flow distribution port is a direction of the stirring strength is large so that the stirring flow of water flows in a direction in which the stirring strength is greatly required to be distributed and flowed out. The width is made of an asymmetrical shape that is configured to be wider by a predetermined width than the width of the side in which the stirring strength is relatively small.

In the stirring apparatus with a stirring force equalization function according to the present invention, the water flow cross-sectional area of the stirring water flow distribution port and the stirring water flow outlet are configured differently in proportion to the required stirring strength.

In the stirring device with a stirring power equalization function according to the present invention, the stirring water flow is configured on the side of the tubular flow path that is carried further comprises a configuration further comprising one or more side water flow distribution port for distributing and flowing out the stirring water flow.

In the stirring apparatus with a stirring force equalization function according to the present invention, the stirring apparatus has a configuration further including a split suction port formed on the side surface of the suction tubular flow path.

In the stirring device with a stirring force equalization function according to the present invention, at the side of the side flow distribution port side is arranged to form an obtuse angle with the flow of water inside the tubular flow path and further comprises at least one stirring flow guide plate for inducing the flow of the stirring water flow It consists of a configuration that includes.

 In addition, a reaction apparatus including a stirring device having a stirring power equalization function according to the present invention, at least one reactor in which the reaction is carried out while the stirring apparatus and water body equipped with the stirring power equalization function according to the present invention are introduced, stayed and discharged. It consists of a configuration that further includes.

 In addition, a reaction apparatus including a stirring device having a stirring power equalization function according to the present invention, at least one reactor in which the reaction is carried out while the stirring apparatus and water body equipped with the stirring power equalization function according to the present invention are introduced, stayed and discharged. And aeration device for dissolving oxygen by abandoning the reaction liquid in the reactor.

A reaction apparatus including a stirring device having an agitation equalization function according to the present invention, wherein the inflow water flowing into the reactor is configured such that the inflow portion and the intake portion are in communication with each other so as to be sucked into the intake portion of the stirring apparatus. Is done.

  A water treatment device comprising a stirring device with a stirring power equalization function according to the present invention, comprising: a stirring device with a stirring power equalization function according to the present invention, at least one reactor in which a water body is reacted while the water body is introduced, stayed, and discharged; And aeration device for dissolving oxygen by abandoning the reaction liquid in the reactor, and a solid-liquid separation device for separating solids and water bodies, and stopping supply of air supplied by the aeration device and operating the stirring device. It is composed of the operation mode selected from three kinds of operation modes: aeration mode, aeration mode that continuously supplies air by aeration device, and intermittent aeration mode that repeats aeration and aeration aeration depending on the set conditions. .

Stirring device with a stirring power equalization function according to the present invention, since the stirring power is not evenly distributed on one side in the reactor, the stirring power is evenly distributed, the reaction efficiency can be improved, by using the aeration agitation and intermittent aeration There is an effect that can provide a reactor and a water treatment device equipped with a function and improved performance.

1 is a conceptual diagram showing a flow rate distribution of a reactor equipped with a conventional general stirrer.
Figure 2 is a perspective view showing the concept of the first embodiment of the stirring device according to the present invention.
Figure 3 is a perspective view showing the concept of a second embodiment of the stirring device according to the present invention.
4 is a cross-sectional view showing the concept of a third embodiment of the stirring device according to the present invention.
5 is a cross-sectional view showing the concept of a fourth embodiment of the stirring apparatus according to the present invention.
6 is a conceptual diagram of a swirl flow preventing plate added to the stirring device according to the present invention.
7a, 7b, 7c, 7d is a conceptual diagram of the stirring water flow distribution port provided in the stirring device according to the present invention.
8 is a conceptual diagram of a first embodiment of a reactor including a stirring device according to the present invention.
9 is a conceptual diagram of a second embodiment of a reactor including a stirring device according to the present invention.
10 is a conceptual diagram of a first embodiment of a water treatment device including a reactor according to the present invention.
11 is a conceptual diagram of a second embodiment of a water treatment device including the reactor according to the present invention.
12 is a conceptual diagram of a third embodiment of a water treatment device including the reactor according to the present invention.
13 is a conceptual diagram of a fourth embodiment of a water treatment device including the reactor according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a stirring device according to a preferred embodiment of the present invention, a reactor and a water treatment device using the same.

Figure 2 is a perspective view showing the concept of the first embodiment of the stirring device according to the present invention.

In the stirring device according to the first embodiment of the present invention, the driving unit 11, the rotating shaft and the rotary car 12 are provided and installed on the support 14, the fluid flow means 10 for flowing the water body and the fluid flow A tubular flow path 20 installed at the discharge part 15 side of the means 10 and open at both sides, and disposed at the discharge part 15 and the discharge part 15 side of the fluid flow means 10. Due to a difference in diameter from the outer surface of the tubular flow path 20 or an arrangement interval between the discharge part 15 of the fluid flow means 10 and the tubular flow path 20 provided on the discharge part 15 side. It is a structure including the stirring water flow distribution port 30 comprised by the opening part formed, and the stirring water flow nozzle 40 comprised by the opening part of the end part of the said tubular flow path 20. In the stirring device according to the first embodiment of the present invention having the above-described configuration, the suction water flow 75 sucked through the water flow suction part 16 of the fluid flow means 10 is the discharge part of the fluid flow means 10. Discharged through the discharge portion 15, the water flow discharged through the discharge portion 15 is divided by a predetermined flow rate through the stirring water flow distribution port 30 and the stirring water flow discharge port 40 is discharged, the stirring water flow The effluent stream 70 flowing out through the jet port 40 is discharged after being transported by the length of the tubular flow path 20 from the stirring water flow distribution port 30. As such, the outflow water stream 71 flowing out from the stirring water flow distribution port 30 and the outflow water stream 70 flowing out through the stirring water flow jet port 40 are spaced apart from each other by the length of the tubular flow path 20. Since the distribution flows out at, the stirring force may be evenly distributed in the inside of the reactor and evenly distributed. The outer diameter of the tubular flow path 20 is preferably smaller than the inner diameter of the casing 13 on the discharge part 15 side. However, when the outer diameter of the tubular flow path 20 is equal to or larger than the inner diameter of the discharge part 15 side casing 13, the gap between the tubular flow path 20 and the discharge part 15 side casing 13 is increased. The stirring water flow distribution port 30 may be configured as an opening formed by adjusting the opening. In addition, the diameters of both ends of the tubular flow path 20 may be the same, and if necessary, the diameters of both ends may be differently formed, such as an enlarged tube or an axle tube.

The stirring device of the first embodiment according to the present invention is a casing provided around the rotational difference 12 of the fluid flow means 10 without the flow of fluid generated from the fluid flow means 10 is concentrated and ejected in one place ( A portion of the discharge water flows out through the stirring water flow distribution port 30 formed between the 13 and the tubular flow path 20 to the outflow water flow 71 and the remaining water flow flows through the tubular flow path 20 through the tubular flow path 20. The remaining outflow 70 is ejected through the stirring water flow spout 40 formed at the end of the tubular flow path 20 after being conveyed by the length of). As the stirring water flow is split out as described above, since the stirring force is divided and generated at different positions, it is possible to realize a stirring apparatus having an agitating force equalization function in which the stirring force is evenly distributed in the reactor.

The discharge part 15 referred to in the specification of the present invention refers to the case of the casing 13 when the casing 13 is provided around the rotation difference 12 of the fluid flow means 10 as shown in FIG. A fluid flow means having a structure in which a positive pressure is formed by rotation of the rotor 12 among both side openings, and the casing 13 is omitted so that the rotor 12 is exposed. In the case of means a circle formed by the rotation of the rotary car 12 while the water flow is sucked and discharged by the rotation of the rotary car 12 means a positive pressure of which is formed to discharge the water flow.

In addition, the suction part 16 referred to in the specification of the present invention refers to the casing 13 when the casing 13 is provided around the rotation difference 12 of the fluid flow means 10 as shown in FIG. 2. Means an opening on the side where negative pressure is formed by the rotation of the rotor 12 among the openings on both sides of the valve, and the casing 13 is omitted so that the rotor 12 is exposed. In the case of [], it means a circle which is formed by the rotation of the rotary vehicle 12 while the water flow is sucked and discharged by the rotation of the rotary car 12, and the negative pressure is formed to mean the side where the water stream is sucked.

Figure 3 is a perspective view showing the concept of a second embodiment of the stirring apparatus according to the present invention.

Stirring apparatus of the second embodiment according to the present invention is provided with a drive unit 11, a rotating shaft and a rotary wheel 12, mounted on a support 14, the fluid flow means 10 for flowing the water body and the fluid flow means ( 10 and two or more multi-stage tubular flow paths 20 and 21 which are installed at the discharge part 15 side and are open at both sides, and are arranged step by step, and the discharge part 15 of the fluid flow means 10 and An opening formed by a diameter difference with an outer surface of the tubular flow path 20 disposed on the discharge part 15 side, and / or the discharge part 15 and the discharge part 15 of the fluid flow means 10. Agitated water flow distribution port 30 composed of an opening formed by an interval between the tubular flow paths 20 and 21 disposed on the side), an inner surface of the previous step tubular flow path 20 and the previous step tubular flow path 20. And the difference in diameter between the outer surface of the subsequent tubular flow passage 21 disposed to be adjacent or overlapping. Agitated water flow distribution port 31 composed of an opening formed by and / or an opening formed by an arrangement interval between the previous stage tubular flow passage 20 and the subsequent stage tubular flow passage 21, and the last stage tubular flow passage 21. It is a configuration including a stirring water flow jet 40 is composed of the end of the opening.

In the stirring device according to the second embodiment of the present invention, the suction water flow 75 sucked through the suction part 16 of the fluid flow means 10 is the discharge part 15 of the fluid flow means 10. Discharged through the discharge portion 15, and the water flow discharged through the discharge portion 15 is divided by a predetermined flow rate through the stirred water flow distribution ports 30 and 31 and the stirred water flow discharge port 40, and the like. , 72, which are discharged to each of the tubular flow paths 20 and 21 by the lengths of the tubular flow paths 20 and 21, respectively, and are separated from each other in the previous stages of the agitating water distribution port 30 at the different positions. Since the agitated water distribution port 31 and the agitated water flow outlet 40 are separated and discharged, the stirring power may be evenly distributed in the reactor 100.

As described above, the second embodiment has a smaller outer diameter than the inner diameter of the previous step tubular flow path 20 in the next step of the previous step tubular flow path 20 disposed at the stirring water jet outlet 40 side of the first embodiment. Although the configuration in which the tubular flow passages 21 of two stages are additionally arranged to include the tubular flow passages 20 and 21 of two stages is illustrated, the present invention is not limited thereto, and three or more multi-stage tubular flow passages having a smaller diameter in stages are provided. And may also be included in the scope of the present invention.

Similar to the combination of ducts and fins used to ventilate the water treatment system to ventilate the building's interior, the agitator can be distributed evenly inside the reactor. It can be configured a stirring facility that can distribute and distribute. In this case, since the structure of the transfer pipe such as the main pipe and the branch pipe is complicated and the pipe friction loss is increased, a diffuser capable of converting the speed head into a pressure head to reduce the flow velocity of the water body in the pipe to reduce the pipe friction loss is provided. It is common to do However, in this case, the power consumption is increased because of the use of a flow means such as a relatively large pump. Therefore, in the present invention, the flow direction of the water flow discharged from the fluid flow means 10 and the opening direction of the stirring water flow distribution ports 30 and 31 and the stirring water flow jet 40 are preferably in the same direction and minimize the curved portion. By simply constructing the flow path, the process and means for converting the velocity head into pressure head are unnecessary, and the flow head-oriented water flow can be transported and distributed with minimal loss of flow energy. Therefore, the stirring device according to the present invention can be applied to the flow means in the form of an axial stirrer to generate a flow head-oriented flow rather than pressure head, it has the advantage of excellent power efficiency and effectively equalize the stirring force.

4 is a cross-sectional view showing the concept of a third embodiment of the stirring apparatus according to the present invention.

In a general stirrer in which a rotor rotates, positive pressure is formed on the front of the rotor, water flow is ejected, and negative pressure is formed on the rear of the rotor, and suction water flows toward the rotor by suction. In this general stirrer, the discharge part and the suction part are located close to each other, and the positive and negative suction pressures are generated close to each other by a relatively narrow front and rear width difference, so that the water flows on both sides interfere with each other due to the pressure difference. May inhibit the flow of.

Accordingly, in the third embodiment of FIG. 4, the suction part 16 is installed in the suction part 16 on the rear side of the rotary car 12 where the suction force is generated so as to communicate with the suction tubular flow path 25 for suction flow. The intake water stream 75 is sucked through the agitated water intake port 41 which is separated from the intake unit 16 by the length of the intake tubular flow path 25, and is not directly sucked through the intake tubular flow path 25. After passing through) will be sucked to the suction unit 16 side. In addition, the side of the suction tubular flow path 25 constitutes a plurality of divided suction inlets 42 to allow the water flow is divided into suction, and the suction water flows 76 are divided and suctioned through each of the divided suction ports 42. By doing so, it can contribute to the equalization of the stirring force.

As described above, the stirring device according to the third embodiment of the present invention includes a fluid flow unit 10 having a driving unit 11, a rotating shaft, a rotary car 12, and installed on the support 14 to flow the water body. A suction water flow inlet configured to be in communication with the suction part 16 side of the fluid flow means 10 and having an opening at both ends of the suction tubular flow path 25 and an opening at the end of the suction tubular flow path 25. It is a structure containing 41. In the stirring device according to the third embodiment of the present invention having the above-described configuration, the suction water flow 75 sucked by the fluid flow means 10 is conveyed by the length of the suction tubular flow path 25 before the suction part ( It is ejected through the discharge part 15 via the 16 and the rotary wheel 12. Therefore, since the stirring water inlet 41 and the discharge part 15 are located at different locations spaced apart from each other by more than the length of the suction tubular flow path 25, interference by the pressure difference between the suction water and the discharge water is prevented, and the suction water flow The stirring force generated by the flow of can be generated split inside the reactor.

In addition, in the stirring apparatus according to the present invention, a discharge tubular flow path [not shown] for transporting the discharge water flow may be installed in the discharge part 15 on the front side of the rotor wheel 12 in which positive pressure is generated and water flow is discharged. Accordingly, the water flow may not be directly discharged through the discharge unit 15, but may flow through the other side opening of the discharge tubular flow path after passing through the discharge tubular flow path.

As described above, the stirring device according to the present invention includes a driving unit 11, a rotating shaft, and a rotating vehicle 12, installed on the support 14, and including a fluid flow unit 10 for flowing a water body, and the fluid flow unit 10. It may be configured to include a tubular flow path is installed so as to communicate with at least one side of the discharge unit 15 and the suction unit 16 of the open side. In the stirring device according to the present invention, the suction water flow sucked by the fluid flow means 10 is transported by the length of the tubular flow path through the tubular flow path for suction or discharge, so that the stirring water flow is sucked. And the location where the agitated water flows out are located at different distances from each other by the length of the tubular flow path, thereby preventing interference due to the pressure difference between the intake water flow and the discharge water flow, and dividing the stirring force generated by the flow of the suction water flow into the reactor. It can be produced and thus contribute to the equalization of the stirring force.

 When the tubular flow path 25 for suction is installed in the suction part 16, the tubular flow path 21 and the stirring water flow distribution port 30 shown in FIG. 4 are omitted, and the stirring water flow is directly through the discharge part 15. May flow out into the reactor. In addition, when a discharge tubular flow path is provided in the discharge part 15, the stirring water flow distribution port 30 may be omitted and the casing 13 may be directly connected to the discharge tubular flow path.

In addition, in the third embodiment of FIG. 4, a plurality of side surfaces of the suction tubular flow path 25 for suction flow transport, which is installed on the rear side of the rotary wheel 12 where the suction force is generated, allows the water flow to be divided and suctioned. The split suction port 42 may be configured to allow suction streams 76 to be split and sucked through the split suction ports 42. As the agitated water flow is split and introduced in this manner, the agitation force may be generated more evenly in the reactor.

5 is a cross-sectional view showing the concept of a fourth embodiment of the stirring apparatus according to the present invention.

The stirring device with a stirring water equalization function according to the fourth embodiment of the present invention is configured on the side of the tubular flow paths 20 and 21 through which the stirring water flow discharged from the rotor 12 is distributed and distributes the stirring water flow. It may further comprise one or more side distribution ports 50 for outflow. However, there is little pressure head and the water flow discharged from the fluid flow means 10 which mainly produces the velocity head-oriented flow flows in a straight direction inside the tubular flow paths 20 and 21 mainly composed of straight pipes. Through the side distribution port 50 formed on the side of the flow path (20, 21) is a configuration that is difficult to smoothly flow out the stirring water. Therefore, the tubular flow path is formed on the side distribution port 50 by forming an obtuse angle with the flow of water in the tubular flow paths 20 and 21, thereby additionally configuring one or more stirring water flow guide plates 51 to guide the stirring water flow. Outflow of the stirred water flow from the flow path (20, 21) can be effectively guided. In the fourth embodiment of the above configuration, the microbial flocs and the reactants are discharged to the bottom surface 81 by maintaining a uniform flow rate by ejecting water flow through the side distribution port 50 to the bottom surface 81 of the reactor. It can be usefully applied to the maintenance of floating state that is not deposited. In addition, the stirring device of such a configuration is because the loss of fluid energy is increased due to the side distribution port 50 and the stirring flow guide plate 51 is to minimize the flow out through the side distribution port 50 when necessary desirable.

Although the side distribution port 50 and the stirring water flow guide plate 51 according to the fourth embodiment of FIG. 5 are illustrated to be applied to the tubular flow paths 20 and 21 on the outlet side, the suction side of the suction side is not limited thereto. It can also be configured in the tubular flow path 25.

The stirring apparatus of the first to fourth embodiments according to the present invention is provided with tubular flow paths 20 and 21, suction tubular flow paths 25 and discharge tubular flow paths (not shown), and these tubular flow paths are heavy and difficult to lift. On the other hand, there is no separate driving part, so there is almost no failure. Therefore, the tubular flow paths and the fluid flow means constitute a detachable portion (not shown) that can be installed or separated independently from each other, and it is preferable that the configuration capable of maintenance while repeating the lifting and installation of the fluid flow means 10 as necessary. Do.

6 is a conceptual diagram of a swirl flow preventing plate added to the stirring device according to the present invention.

Stirring device equipped with a stirring force equalization function according to the present invention, the rotational flow prevention plate 60 to convert the rotational water flow generated by the rotation of the rotary car 12 to a straight water flow to reach the distant water flow (60) (61), wherein the swirl flow preventing plates (60, 61) are formed on the inlet side outer surface of the tubular flow path (20) disposed close to the discharge portion side casing (13) of the fluid flow means (10). It may be configured as a plate that is installed to protrude on at least one side of the inlet side inner surface of the tubular flow path (20). In this way, the swirl flow prevention plate converts the swirl flow-type water stream, which has a high resistance in the reaction solution, into a straight stream that can reach far and relatively low resistance, so that the effluent stream and the stirring force can be transmitted far. Will be.

7a, 7b, 7c, 7d is a conceptual diagram of the stirring water flow distribution port provided in the stirring apparatus according to the present invention.

Stirring device equipped with the stirring water equalization function according to the present invention, the stirring water flow distribution port is a direction of the stirring strength is large so that the stirring flow of the flow rate can be distributed and flowed out in the direction that the stirring strength is required large The width may be asymmetrically wider by a predetermined width than the width of the side of the direction in which the stirring strength is relatively small.

Figure 7a relates to an embodiment in which the stirring device with a stirring force equalization function according to the present invention is installed near the wall surface 80, which is the interface of the reactor. In this case, the stirring water stream discharged to the wall surface 80 side is exhausted by the friction with the wall surface 80, so that it does not contribute much to the stirring of the reaction liquid inside the reactor that requires more stirring power on the membrane. do. Therefore, the width of the stirring water flow distribution port 31 on the wall surface 80 is configured to be relatively narrower and the width of the stirring water flow distribution port 31 on the inner side of the reactor where the stirring force in the opposite direction is large is relatively wider. It may be arranged to eccentric the connection portion of the previous stage tubular flow passage 20 having a larger diameter and the subsequent stage tubular flow passage 21 having a smaller diameter.

The flow of the effluent stream 72 in this embodiment is distributed more relatively to the inside of the reactor and relatively less flow to the wall 80 side, which is the interface of the reactor. This action and less stirring force is applied to the wall surface 80 side less stirring force required. In this way, since the flow rate ejected to the wall surface 80 side is reduced, waste of agitation force due to friction with the wall surface 80 can be prevented.

Figure 7b relates to an embodiment in which the stirring device with a stirring force equalization function according to the present invention is installed in close proximity to the water surface 82, which is the interface between the reaction liquid and the upper side of the reactor. In this case, the agitated water stream discharged toward the water surface 82 in contact with the atmosphere is exhausted due to the generation of blue waves which are not related to the agitation of the reaction solution, and does not contribute much to the reaction solution agitation in the reactor. Therefore, the width of the stirring water distribution port 31 on the water surface 82 side is configured to be relatively narrower, and the width of the stirring water distribution port 31 on the inner side of the reactor in the opposite direction is configured to be relatively wider. A wider front stage coronary flow path 20 and a smaller diameter can be arranged so as to eccentrically connect the connections of the subsequent stage coronary flow paths 21. In this embodiment, the flow of the effluent stream 72 is relatively distributed to the reaction liquid because more flow rate and agitation force are distributed to the inside of the reactor and relatively less flow rate and agitation force is distributed to the water surface 82 side. A stronger stirring force is applied and wasteful stirring force due to generation of blue waves at the water surface 82 can be prevented.

FIG. 7C relates to an embodiment in which a stirring device with a stirring force equalization function is installed in proximity to the bottom surface 81, which is a lower side interface of the reactor. In this case, the stirring water stream discharged to the bottom surface 81 side is exhausted by friction with the bottom surface 81 and does not contribute much to the reaction liquid agitation inside the reactor that requires a stronger stirring force. Therefore, the width of the stirring water flow distribution port 31 on the bottom surface 81 side is configured to be relatively narrower and the width of the stirring flow water distribution port 31 inside the reactor in the opposite direction is relatively wider so that the diameter is wider. It may be arranged so as to eccentrically connect the connection of the first step coronary flow path 20 and the smaller step diameter coronary flow path 21. In this embodiment, the flow of the effluent stream 72 is distributed more relatively to the inside of the reactor, and relatively less flow is distributed to the bottom surface 81 so that more stirring force is applied to the reaction liquid. And waste of the stirring force due to friction with the bottom surface 81 can be prevented.

Figure 7d is an embodiment in which the stirring device equipped with a stirring force equalization function according to the present invention is installed on the corner surface where the bottom surface 81, which is the lower side interface of the reactor, and the wall surface 80, which is the side interface of the reactor, cross each other. It is about. In this case, the agitated water flow discharged to the corner surface side is unnecessarily exhausted by friction with the wall surface 80 and the bottom surface 81 and does not contribute much to the reaction liquid agitation inside the reactor. Therefore, the width of the stirred water flow distribution port 31 on the corner side is configured to be relatively narrower and the width of the stirred water flow distribution port 31 on the inside of the reactor in the opposite direction is configured to be relatively wider. 20 and the connection part of the later stage tubular flow path 21 with a smaller diameter can be arrange | positioned so that it may be eccentric. In this embodiment, the flow of the effluent stream 72 is distributed more relatively to the inner side of the reactor and relatively less flow to the corner surface of the reactor, so that more stirring force is applied to the reaction liquid. And unnecessary waste of agitation force due to friction with the wall surface 80 and the bottom surface 81 can be prevented.

7A to 7D illustrate an embodiment in which the connecting portions of adjacent front and rear tubular flow paths are eccentric, but the present invention is not limited thereto, and the discharge part of the fluid flow means 10 and the adjacent tubular flow path 20 are not limited thereto. The stirring water flow distribution port 30 formed by the opening may be configured to be eccentric in the same manner.

7A to 7D illustrate an embodiment in which the stirring water flow distribution port 31 is eccentric due to the difference in the diameter of adjacent tubular flow paths, but is not limited thereto. As the side that takes a larger stirring force is configured to be wider and the side requiring a smaller stirring force is configured to be narrower, the flow of the effluent can be controlled by the width of the opening formed. In order to form the openings having different sizes as described above, the adjacent cross sections of the tubular flow paths may be obliquely inclined or stepped in a stepwise manner, thereby making it possible to vary the distance between the adjacent tubular flow paths.

In addition, the widths of the stirring water flow distribution ports 30 and 31 and the stirring water flow outlet 40 may be configured differently in proportion to the required stirring strength.

8 is a conceptual diagram of a first embodiment of a reactor including a stirring device according to the present invention.

8 relates to a reaction apparatus 200 including a stirring apparatus 110 equipped with a stirring force equalization function according to the present invention. Non-aeration agitator type reactor comprising one or more agitators 110 equipped with a stirring force equalization function according to the present invention inside the reactor 100 to allow the reaction to be made while the water body is introduced, stayed and discharged 200.

The reaction apparatus 200 of the first embodiment shown in FIG. 8 having such a configuration does not have an aeration device for dissolving oxygen. Thus, the reaction apparatus 200 may be a physicochemical water treatment device such as agglomeration or mixing, or a biological water treatment device operated under anoxic to anaerobic conditions. It relates to a reactor equipped with aerobic agitation function that can be applied.

9 is a conceptual diagram of a second embodiment of a reactor including a stirring device according to the present invention.

9 is related to a reaction apparatus including a stirring apparatus 110 equipped with a stirring force equalization function according to the present invention. Reactor 100 in which the reaction is carried out while the water body flows in, stays, and flows out, a stirring device 110 equipped with a stirring power equalization function according to the present invention, a blower 121, an air supply pipe 122, and an acid pipe 123. It relates to a reaction apparatus 210 including a) and aeration device 120 for supplying dissolved oxygen by abandoning the reaction liquid in the reactor (100).

In addition, the aeration device 120, the air control valve 124 that can supply or stop the air to the air supply pipe 122 for transporting the compressed air generated in the blower 121 and supply to the diffuser 123 It may be made, including.

When the operation of the stirring device 110 and the aeration device 120 will be described in more detail, the air control valve 124 is hermetically operated to stop the air supply and the stirring device 110 is stirred and operated to be anaerobic or anaerobic. The aerobic agitation mode is operated in a non-aeration agitation mode, the air control valve 124 is operated in an aeration mode in which the aerobic biological reaction is performed when the air is supplied open, the air control valve 124 according to the set conditions By opening and closing operation of the a) and the operation of the operation and the operation of the stirring device 110 is made to intersect, the aeration and aeration agitation can be operated in the intermittent aeration mode is repeated. In this way, according to the selection of the operating state of the air control valve 124, it is possible to select any one of the operation mode of operation mode.

In addition, the agitation force in the reactor 100 may be less than a predetermined agitation strength only by the fluid flow generated by ejecting the air bubbles from the diffuser 123, that is, the agitation force caused by the aeration. The stirring device 110 may be operated even in the abandon mode in which the 124 is open. As described above, the reaction apparatus 210 of the second embodiment according to the present invention can realize various reactions with one reaction apparatus without separately installing separate aerobic reactors, anaerobic and anaerobic reactors, Therefore, it has the advantage of operating by selecting the optimal operation mode.

In addition, the blower 121 may switch the operation mode by opening and closing the air control valve 124 in a state of normal operation, as well as omitting the operation or installation of the air control valve 124 and the blower By starting and stopping, one of the three operation modes can be selected and operated.

In addition, the aeration device may be selected from various types of aeration device, such as a conventional aquatic device, aeration device configured to include a pump ejector, or a surface aeration device.

As described above, the reaction apparatus 210 of the second embodiment according to the present invention may be operated in either an aeration mode or an aeration mode, or an intermittent aeration mode, depending on the operation of the aeration device and the agitation device. There is such an intermittent aeration mode may be configured to automatically repeat aeration or aeration agitation in accordance with the set conditions in conjunction with the Timer, ORP or DO Controller.

 As described above, the agitation device 110 equipped with the stirring force equalization function according to the present invention, the one or more reactors 100 in which the reaction is carried out while the water body is introduced, stayed and discharged, and the reaction solution in the reactor 100 is abandoned. In the reactor (210) comprising aeration device 120 to dissolve the oxygen, by aeration aeration mode to stop the supply of air supplied by the aeration device and to operate the agitator, continuously by aeration device A water treatment apparatus operating in an operation mode selected from three types of operation modes, aeration mode for supplying air and intermittent aeration mode in which aeration and aeration agitation is repeated in accordance with the set conditions, can be realized.

In the reaction apparatus 200 of the first embodiment according to the present invention shown in Figs. 8 and 9 and the reaction apparatus 210 equipped with the intermittent aeration function of the second embodiment, the rotor wheel 12 Inlet water is introduced into the reactor 100 by the suction force on the suction part 16 side of the fluid flow means 10 generated by the suction of the fluid flow means 10 and the suctioned inlet water of the stirring device 110 Inflow water is rapidly diffused into the reaction liquid by being switched to the effluent streams 70, 71 and 72 through the stirred water distribution ports 30 and 31 and the stirred water jet outlet 40 to be discharged into the reactor 100. It can contribute to increase of reaction efficiency, such as shortening reaction time. Here, the inflow water may be the initial inflow water, the outflow water of the pretreatment device, or the reaction liquid flowing out of the previous stage reactor according to the arrangement of the reactor 100.

The inlet pipe providing a flow path for the inlet water to flow into the reactor 100 and the suction unit 16 of the stirring device 110 are connected to each other, or the stirring device 110 at a position inside the reactor into which the inlet water is introduced into the reactor. The suction part 16 of () can be arrange | positioned. In addition, when the suction tubular flow passage 25 is provided as in the stirring device according to the third embodiment of the present invention, the stirring water flow inlet formed on one side of the suction tubular flow passage 25 at a position inside the reactor into which the inflow water flows. Inlet part of the stirring device 110 of the present invention and the inlet part such as the inlet pipe for providing a flow path into which the inflow water is introduced by a method such as 41 or a specific position inside the reactor where the inflow water is concentrated. ) Can communicate with each other to quickly diffuse the influent into the reaction solution and increase the reaction efficiency.

10 is a conceptual diagram of a first embodiment of a water treatment device including a reactor according to the present invention.

The water treatment apparatus of the first embodiment of the present invention shown in FIG. 10 includes four sets of reactors 210 of the second embodiment sequentially connected in series along a flow direction in which inflow water flows in and out. The present invention relates to a water treatment apparatus for treating domestic sewage and industrial wastewater.

The reactor 210 of the second embodiment may be operated in aeration mode, aeration aeration mode, intermittent aeration mode according to the operation of the stirring device and the aeration device can be selected and operated from the three operating modes. Therefore, the operation mode is made up of three 4 of the reactor can be operated with a first embodiment of water treatment apparatus ³⁴ of processing steps that is, is selected from among 81 treatment process it can be run. As described above, the water treatment apparatus including the reactor 210 of the second embodiment may be operated by selecting from 3 ⁿ types of treatment processes according to the number n of the reactors 210.

According to the above concept, the water treatment device including the reactor 210 capable of intermittent aeration according to the second embodiment of the present invention is capable of introducing inflow flow rate and concentration, inflow property or water temperature without remodeling or changing the facility. By selecting and changing the optimum operation mode in response to the change of the operating conditions, it is possible to select and operate the processing process most suitable for the required operating conditions.If the operating conditions are changed again, the operating mode optimized for the changed operating conditions is selected. There is an advantage to cope with changes in various operating conditions.

In addition, the water treatment apparatus according to the present invention may further include a pretreatment apparatus 300 which is a pretreatment treatment apparatus capable of firstly treating the inflow water to reduce the inflow load introduced into the reactor.

The pretreatment device 300 is disposed at the inlet side of the first reaction device, that is, the first reaction device, and is a solid solution of various types such as a filter, a dissolved air floatation (DAF), a gravity type primary sedimentation basin, or a flocculation settler. The separation apparatus may be selected from, but is not necessarily limited to, all means and apparatuses having a solid-liquid separation function for separating solid and liquid.

In addition, the rear end of the water treatment apparatus according to the present invention, that is, the outlet side of the last stage of the reaction apparatus further comprises a solid-liquid separation device 400 for separating solids and water bodies such as membrane separation device, pressure flotation device, filtration device, gravity settling device, etc. By constructing a water treatment device, solids such as microbial flocs and clean water can be separated from the reaction solution.

In FIG. 10, the pretreatment apparatus 300 and the solid-liquid separator 400 of a later stage exemplify a gravity sedimentation basin in which solids such as sedimentary organic matter are precipitated and separated by gravity. However, the solid-liquid separator 400 in the water treatment apparatus according to the present invention is a biological reaction by gravity sedimentation basins, membrane separators for separating solids by membranes, filtration devices for filtering solids, or biofilms. And at the same time it can be selected from among the bio-filter that can be removed to filter the solids, not necessarily limited to, it includes all means and apparatus equipped with a solid-liquid separation function for separating solids and liquids.

In addition, the solid-liquid separation device may be installed in the previous stage or the rear stage of the combination apparatus consisting of at least one selected from the reaction apparatus of the first to second embodiments of the water treatment apparatus including the stirring apparatus according to the present invention. And, if installed at the same time before and after step may be installed different types of solid-liquid separator.

11 is a conceptual diagram of a second embodiment of a water treatment device including the reactor according to the present invention.

In the water treatment apparatus according to the second embodiment of the present invention shown in FIG. 11, three tanks and the last stage of the reactor 210 of the second embodiment installed in series are sequentially connected along the flow direction of inflow and outflow. The present invention relates to a water treatment apparatus including a reactor 220 which is provided to be operated at all times aerobic.

The reaction apparatuses 210 of the second embodiment may be operated in aeration mode, aeration aeration mode, intermittent aeration mode according to the operation of the agitator and the aeration device and may be selected and operated from three operation modes. Therefore, the water treatment apparatus of the second embodiment, which is composed of three sets of reactors 210 that can be operated in three operation modes, may be selected and operated from ^{three to} three treatment processes, that is, 27 treatment processes.

The effluent of the non-aerated stirred or intermittent aerated reactor operated under anaerobic to anaerobic conditions may contain undecomposed residual organic matter or released phosphorus, or may have low settling, as shown in FIG. 11. It is preferable to finish the polishing by the aerobic reactor 220 which is operated under aerobic conditions at all times before flowing into).

12 is a conceptual diagram of a third embodiment of a water treatment device including the reactor according to the present invention.

In the water treatment apparatus of the third embodiment of the present invention shown in FIG. 12, one set of the aeration apparatus 200 of the aerobic agitation type according to the first embodiment is sequentially connected in series along the flow direction in which the inflow water flows in and out. Iii) and two reactors equipped with the intermittent aeration function according to the second embodiment, and an aerobic reactor 220 is included.

In the reactor 200 of the first embodiment, which is operated in a single mode of aerobic agitation and is disposed first, anoxic to anaerobic reactions are performed, and the inside is transferred from the reactor of the rear stage through an internal circulation device (not shown). The denitrification reaction of nitrogen oxide contained in the return sludge, etc. conveyed through the circulating water and the sludge conveying apparatus (not shown) may be made.

The reaction apparatus 210 of the second embodiment may be operated in aeration mode, aeration aeration mode, intermittent aeration mode according to the operation of the stirring device and the aeration device may be selected and operated from three operating modes. Therefore, the third embodiment water treatment device consisting of two sets of the reaction device 210, which can be operated in three operating modes can be operated is selected from the three ^two treatment process that is, nine treatment step.

13 is a conceptual diagram of a fourth embodiment of a water treatment device including the reactor according to the present invention.

The water treatment apparatus according to the fourth embodiment of the present invention shown in FIG. 13 relates to a water treatment apparatus including the reactors 200 and 210 and the aerobic reactors 220 of the first to second embodiments described above. Example of the solid-liquid separator by 410 is installed.

As such, the water treatment apparatus according to the present invention may be selected and applied among various solid-liquid separators, as well as a solid-liquid separator by membrane separation. In addition, the solid-liquid separation device by membrane separation can be subjected to non-solid materials such as solid organic materials such as SS and colloidal particles, as well as dissolved organic materials.

 As described above, the stirring device 110 equipped with the stirring force equalization function according to the present invention, one or more reactors 100 in which the reaction is carried out while the water body flows in, stays and flows out, and the reactor 100 Various embodiments of the water treatment apparatus including the aeration device 120 for dissolving oxygen by abandoning the reaction solution therein and a solid-liquid separation device for separating solids and water bodies stop the air supply supplied by the aeration device and stir the stirring. It is operated in the operation mode selected from three kinds of operation modes: non-aeration agitation mode for operating the device, aeration mode for continuously supplying air by the aeration device, and intermittent aeration mode for repeating aeration and aeration aeration depending on the set conditions. A water treatment device can be realized.

10: fluid flow means 11: drive unit
12: rotor wheel 13: casing
14: support 15: discharge part
16: suction part 20, 21: tubular flow path
25: suction tubular flow path 30, 31: agitated water flow distribution port
40: stirred water inlet 41: stirred water inlet
42: split inlet port 50: side distributor port
51: stirring flow guide plate 60, 61: swirl flow preventing plate
70, 71, 72: outflow 75, 76: intake
80: wall 81: floor
82: sleep 100: reactor
110: stirring device 120: aeration device
121: blower 122: blower piping
123: diffuser 124: air control valve
200, 210: reactor 220: aerobic reactor
300: pretreatment device 400: solid-liquid separator
410: membrane separation device

Claims (13)

A fluid flow means provided with a drive unit, a rotating shaft, and a rotation difference to flow the water body; And
A tubular flow path installed at a discharge side of the fluid flow means and having both sides opened; and
Agitated water flow distribution port consisting of an opening formed between the discharge portion of the fluid flow means and the tubular flow path; And
Includes; a stirring water flow jet consisting of the opening of the end of the tubular flow path;
The water flow discharged from the fluid flow means is discharged by being divided by a predetermined flow rate through the stirring flow distribution port and the stirring water flow outlet, the transfer and spaced apart by the length of the tubular flow path characterized in that the configuration is discharged Stirring device with equalization function.
A fluid flow means provided with a drive unit, a rotating shaft, and a rotation difference to flow the water body; And
A tubular flow passage of two or more stages which is open at both sides and disposed at the discharge side of the fluid flow means; and
An agitated water flow distribution port including an opening formed between the discharge portion of the fluid flow means and the tubular flow path disposed on the discharge side, and an opening formed between the previous step tubular flow path and the previous step tubular flow path; and
And a stirring water jet outlet consisting of an end opening of the last step of the tubular flow path.
The water flow discharged from the fluid flow means is discharged by being divided by a predetermined flow rate through the stirring flow distribution port and the stirring water flow outlet, the transfer and spaced apart by the length of the tubular flow path characterized in that the configuration is discharged Stirring device with equalization function.
The method according to claim 1 or 2,
The tubular flow path is installed on the suction side of the fluid flow means and the other side is open;
Stirring device with a stirring force equalization function, characterized in that the water flow sucked by the fluid flow means is configured to be transported and spaced apart by the length of the tubular flow path.
The method according to claim 1 or 2,
And a swirl flow preventing plate for converting rotational water flow into a straight stream, wherein the swirl flow preventing plate includes an outer side surface of the tubular flow path inlet side proximate to the fluid flow means and an inner side surface of the inlet side of the tubular flow path. Stirring device with agitation force equalization function, characterized in that the plate is installed to protrude on at least one side of the.
The method according to claim 1 or 2,
In order to distribute and flow more agitated water flow in a direction in which agitation strength is large, the agitation flow distribution port has an area on the side where the agitation intensity is large is larger than a width on the side where the agitation intensity is relatively small. Stirring device equipped with a stirring force equalization function, characterized in that the asymmetrical configuration is configured to be wider by a predetermined width.
The method according to claim 1 or 2,
Stirring device having a stirring power equalization function, characterized in that the water flow cross-sectional area of the stirring water distribution port and the stirring water jet outlet is configured differently in proportion to the required stirring strength.
The method according to claim 1 or 2,
Stirring power equalization function further comprises; at least one side water flow port is configured on the side of the tubular flow path to which the stirred water flow is conveyed and for dispensing and flowing the stirred water flow. The method of claim 3,
And a split suction port formed on a side surface of the tubular flow path installed at the suction side of the fluid flow means.
The method of claim 7, wherein
Stirring power equalization function further comprises; at least one stirring water flow guide plate is arranged to form an obtuse angle with the flow of water inside the tubular flow passage on the side of the water flow distribution port side; Device.
A reactor comprising a stirring device equipped with a stirring force equalizing function according to claim 1 or 2,
Reaction apparatus including a stirring device having a stirring power equalization function, characterized in that it further comprises;
The method of claim 10,
Aeration device comprising a stirring device having a stirring function equalization function, characterized in that it further comprises; aeration device for dissolving oxygen by abandoning the reaction liquid in the reactor.
The method of claim 10,
Reactor including an agitator having a stirring force equalization function, characterized in that the inlet and the suction unit is in communication with each other so that the inlet water flowing into the reactor is sucked into the suction unit of the stirring device.
A stirring device having a stirring power equalization function according to claim 1 or 2;
One or more reactors in which the reaction takes place as the water body flows in, stays in and out;
Aeration device for dissolving oxygen by abandoning the reaction liquid in the reactor;
It includes; solid-liquid separation device for separating the solid and the water body;
Stopping the supply of air supplied by the aeration device and operating the agitator, aeration mode for continuously supplying air by the aeration device and aeration and aeration of the aeration aeration depending on the set conditions A water treatment apparatus comprising a stirring device with a stirring power equalization function, characterized in that the structure is operated in the operating mode selected from the three types of intermittent aeration mode.

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