Mixing de-dusting device

Abstract

To provide a mixture clarifier and a flocculation method in the mixture clarifier that allow power saving and restriction of an installation space.SOLUTION: A mixture clarifier comprises: a bottomed tank with a nearly cylindrical shape; a cylinder with a nearly cylindrical shape which is provided inside the tank so that its axial direction almost coincides with the axis of the tank, and in which an upper surface and a lower surface are open; an inflow pipe through which water to be treated flows in; an outflow pipe through which water to be treated flows out; and a partition part which partitions a channel formed of a lateral wall inner side of the tank and a lateral wall outer side of the cylinder, into an upper channel and a lower channel in the axial direction of the tank and the cylinder. The inflow pipe communicates with the upper channel, whereas the outflow pipe communicates with the lower channel.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention is a mixing and turbidification device. Place Regarding. [Background technology]

[0002] For example, water purification plants use water purification equipment that removes suspended solids (SS) contained in raw water (hereinafter also referred to as water to be treated) such as river water or well water. Specifically, such water purification equipment mixes a flocculant into the water to be treated, for example, to flocculate the suspended solids contained in the water to be treated, and then precipitates and removes them. This makes it possible for the water purification plant to produce safe water for daily use from the water to be treated (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-185007 A Summary of the Invention [Problem to be solved by the invention]

[0004] The water purification facility as described above, for example, has a tank (hereinafter also referred to as a mixing tank) for mixing the coagulant and the water to be treated, a tank (hereinafter also referred to as a flocculation tank) for forming flocs by coagulating suspended matter, and a tank (hereinafter also referred to as a sedimentation tank) for settling the formed flocs and separating them from the water to be treated, in the upstream of the filtration device that performs filtration membrane treatment of the water to be treated. This makes it possible for the water purification facility to reduce the turbidity of the water to be treated sent to the filtration device. Therefore, in the water purification device, it becomes possible to reduce the load of solid matter on the filtration device and shorten the cleaning cycle of the filtration membrane.

[0005] However, in the above-mentioned water purification facilities, the mixing power (electricity) in the mixing basin and the flocculation basin may be large. In addition, the above-mentioned mixing and clarification device requires a settling basin, which may require a large installation space. Therefore, in the above-mentioned water purification facilities, it is desired to reduce power consumption and the installation space. [Means for solving the problem]

[0006] In order to achieve the above-mentioned power saving and reduction in installation space, the mixing and turbidity removal device of the present invention comprises a substantially cylindrical tank having a bottom, a substantially cylindrical tube with open top and bottom faces that is arranged inside the tank so that its axial direction is substantially aligned with that of the tank, an inlet pipe through which the water to be treated flows in, an outlet pipe through which the treated water flows out, and a partition that divides the flow path formed by the inner side wall of the tank and the outer side wall of the tube into an upper flow path and a lower flow path in the axial direction of the tank and the tube, and the inlet pipe is connected to the upper flow path, and the outlet pipe is connected to the lower flow path. Effect of the Invention

[0007] The mixing and clarification device of the present invention makes it possible to reduce power consumption and installation space. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a vertical cross-sectional view of the mixing and clarification device 100 as viewed from the front. [Diagram 2] FIG. 2 is a cross-sectional view of the mixing and clarification device 100 taken along line AA. [Diagram 3] FIG. 3 is a cross-sectional view of the mixing and clarification device 100 taken along the line BB. [Figure 4] FIG. 4 is a cross-sectional view taken along CC of the mixing and clarification device 100. [Diagram 5] FIG. 5 is a diagram illustrating the formation of flocs. [Figure 6] FIG. 6 is a diagram illustrating the formation of flocs. [Figure 7] FIG. 7 is a diagram illustrating the formation of flocs. [Figure 8] FIG. 8 is a diagram illustrating the formation of flocs. [Figure 9] FIG. 9 is a diagram illustrating the formation of flocs. [Figure 10] FIG. 10 is a diagram illustrating the configuration of the pump and the control device. [Figure 11] FIG. 11 is a vertical cross-sectional view of the mixing and clarification device 200 in the second embodiment as viewed from the front. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to these embodiments.

[0010] [Mixing and clarification device 100 in the first embodiment] Fig. 1 to Fig. 10 are configuration diagrams of the mixing and turbidity device 100 in the first embodiment. Specifically, Fig. 1 is a vertical cross-sectional view of the mixing and turbidity device 100 as viewed from the front. Fig. 2 is an AA cross-sectional view of the mixing and turbidity device 100, Fig. 3 is a BB cross-sectional view of the mixing and turbidity device 100, and Fig. 4 is a CC cross-sectional view of the mixing and turbidity device 100.

[0011] 1, the mixing and turbidity removing device 100 has, for example, a substantially cylindrical tank 10 having a bottom 12, and a substantially cylindrical tube 20 that is provided inside the tank 10 so that its axial direction substantially coincides with that of the tank 10 and that has an open upper surface 21a and lower surface 21b. The axial direction of the tank 10 may coincide with the axial direction of the tube 20, or may be inclined at a predetermined angle (for example, an angle of less than 5 degrees) with respect to the axial direction of the tube 20.

[0012] As shown in Figs. 1 and 3, the mixing and clarification device 100 has a partition 31 having an annular shape in top view between the inner side of the wall portion 11 and the outer side of the wall portion 21.

[0013] Furthermore, as shown in Figures 1, 2 and 4, the mixing and clarification device 100 has an inlet pipe 41 through which the treated water (the treated water to which a coagulant has been added) flows in from a mixing basin (not shown), and an outlet pipe 42 through which the treated water (hereinafter simply referred to as treated water) flows out after solid-liquid separation in the mixing and clarification device 100.

[0014] The tank 10 has, for example, a wall 11 having a circular cross section in the horizontal direction, a bottom 12 formed integrally with the wall 11 below the wall 11, and a floc discharge pipe 13 communicating with the lower end of the bottom 12. Note that the wall 11 may have, for example, an elliptical cross section in the horizontal direction.

[0015] The wall portion 11 has, for example, an inlet 11a communicating with the inlet pipe 41 and an outlet 11b communicating with the outlet pipe .

[0016] The bottom portion 12 has, for example, a tapered shape that narrows toward the bottom. And, on the bottom portion 12, for example, flocks formed on the inner side of the wall portion 11 are deposited.

[0017] The floc discharge pipe 13, for example, discharges flocs accumulated on the bottom portion 12 to the outside. Specifically, the floc discharge pipe 13 discharges the flocs accumulated on the bottom portion 12 to the outside in response to the valve 32 being opened.

[0018] Here, it is preferable that the upper surface (not shown) of the wall portion 11 is sealed. That is, it is preferable that the tank 10 is sealed except for, for example, the inlet 11a and the outlet 11b. This allows the untreated water flowing in from the inlet pipe 41 to flow out from the outlet pipe 42 in the tank 10, as described below.

[0019] The cylinder 20 has a wall portion 21 that has, for example, a circular cross section in the horizontal direction and is open at an upper surface 21a and a lower surface 22b. Note that the wall portion 21 may have, for example, an elliptical cross section in the horizontal direction.

[0020] The wall portion 21 has, for example, a shorter length in the axial direction (vertical direction) than the wall portion 11. The height of the upper end portion of the wall portion 21 in the vertical direction is, for example, lower than the height of the upper end portion of the wall portion 11, and the height of the lower end portion of the wall portion 21 in the vertical direction is higher than the height of the lower end portion of the wall portion 11. Note that a part of the upper end side of the wall portion 21 may have a tapered shape that tapers upward, and a part of the lower end side of the wall portion 21 may have a tapered shape that tapers downward.

[0021] The partition portion 31, for example, fixes the tube 20 to the tank 10 and divides the flow path formed by the inner side of the wall portion 11 and the outer side of the wall portion 21 into an upper flow path R1 and a lower flow path R4 in the axial direction of the tank 10 and the tube 20.

[0022] That is, the upper flow path R1 is a flow path corresponding to the upper space among the spaces partitioned by the tank 10, the tube 20, and the partition 31, as shown in Figures 1 and 2. The lower flow path R4 is a flow path corresponding to the upper space among the spaces partitioned by the tank 10, the tube 20, and the partition 31, as shown in Figures 1 and 4. Hereinafter, the flow path from the upper surface to the lower surface of the wall 21 (the flow path corresponding to the space inside the tube 20) will also be referred to as the tube flow path R2, and the flow path below the tube flow path R2 (the flow path corresponding to the space below the lower end of the tube 20) will also be referred to as the bottom flow path R3.

[0023] The inlet pipe 41 communicates with the upper flow passage R1 via, for example, the inlet 11a. The outlet pipe 42 communicates with the lower flow passage R4 via, for example, the outlet 11b. That is, although details will be described later, the water to be treated that flows into the tank 10 from the inlet pipe 41 passes through the upper flow passage R1, the cylindrical flow passage R2, the bottom flow passage R3, and the lower flow passage R4 in this order. Then, solid-liquid separation is performed during this passing process. Then, the treated water after the solid-liquid separation flows out from the lower flow passage R4 to the outlet pipe 42. Note that points P1 and P2 shown in FIG. 1 will be described later.

[0024] 2, the inflow pipe 41 may be installed such that its longitudinal direction is along the tangential direction in the horizontal cross section of the tank 10 (wall 11). This allows the inflow pipe 41 to allow the untreated water to flow into the tank 10 while maintaining the flow velocity.

[0025] [Floc formation] Next, the formation of flocs in the mixing and turbidity removal device 100 will be described. Fig. 5 to Fig. 8 are diagrams for explaining the formation of flocs 1. Specifically, Fig. 5, Fig. 7 and Fig. 9 are vertical cross-sectional views (corresponding to Fig. 1) of the mixing and turbidity removal device 100 as viewed from the front. Fig. 6 is an AA cross-sectional view (corresponding to Fig. 2) of the mixing and turbidity removal device 100, and Fig. 8 is a CC cross-sectional view (corresponding to Fig. 4) of the mixing and turbidity removal device 100. In the following, illustrations of the upper surface 21a and the lower surface 21b of the tube 20 will be omitted.

[0026] First, the water to be treated flows from the inflow pipe 41 into the upper flow passage R1 as shown by the solid arrow in Fig. 5. Specifically, for example, as shown in Fig. 6, when the longitudinal direction of the inflow pipe 41 is aligned with the tangent direction in the horizontal cross section of the wall portion 11, the water to be treated flows into the upper flow passage R1 while the flow velocity in the inflow pipe 41 is maintained.

[0027] Next, as shown by solid arrows in Figures 5 and 6, the flow of the water to be treated in the upper flow passage R1 becomes an upward swirling flow. That is, since the partition 31 is provided at the bottom of the upper flow passage R1, the water to be treated that flows into the upper flow passage R1 from the inlet pipe 41 rises while swirling. Then, in the upper flow passage R1, as shown in Figure 5, minute flocs 1 (hereinafter also referred to as flocs 1a) with small particle sizes are formed by agitation caused by the swirling flow of the water to be treated.

[0028] 5 and 6, the width of the upper flow passage R1 is narrower than that of the tubular flow passage R2. Therefore, the residence time of the water to be treated in the upper flow passage R1 (hereinafter also referred to as the T value) is shorter than the T value in the tubular flow passage R2 described later. Moreover, the water to be treated that flows from the inflow pipe 41 into the upper flow passage R1 flows in while maintaining the flow velocity in the inflow pipe 41. Therefore, the stirring strength (hereinafter also referred to as the G value) caused by the flow of the water to be treated is greater than the G value in the tubular flow passage R2 described later.

[0029] Here, the force of the water in the horizontal direction (swirling, lateral flow) weakens while causing pressure loss. In other words, as the water flows upward, the flow rate of the swirling flow decreases. On the other hand, the force of the water in the vertical direction remains almost unchanged (since it is a push flow, the flow rate remains almost unchanged).

[0030] Next, the water to be treated (water to be treated containing flocs 1a) that has risen to the upper end of the upper flow passage R1 due to the upward swirling flow in the upper flow passage R1 sequentially flows into the tubular flow passage R2 as shown by the solid arrows in Fig. 7. Then, in the tubular flow passage R2, the flow of the water to be treated becomes a downward swirling flow as shown by the solid arrows in Fig. 7 and Fig. 8. Furthermore, in the tubular flow passage R2, flocs 1 (hereinafter also referred to as flocs 1b) that are larger in particle size than the flocs 1a are formed by agitation caused by the swirling flow of the water to be treated, as shown in Fig. 7.

[0031] Here, in the example shown in Fig. 7 and Fig. 8, the width of the tubular flow path R2 is wider than that of the upper flow path R1. Therefore, the T value of the water to be treated in the tubular flow path R2 is longer than that in the upper flow path R1. In addition, the swirling flow of the water to be treated flowing from the upper flow path R1 into the tubular flow path R2 becomes smaller (the mixing strength becomes weaker) as it flows from the upper flow path R1 to the tubular flow path R2. Therefore, the G value due to the flow of the water to be treated is smaller than the G value in the upper flow path R1. In particular, the vertical flow direction of the water to be treated in the tubular flow path R2 (downward flow) is opposite to the flow direction in the upper flow path R1 (upward flow), so the G value due to the flow of the water to be treated is smaller in the tubular flow path R2.

[0032] Furthermore, when the water to be treated descends from the tubular flow path R2 to the bottom side flow path R3, the swirling flow becomes smaller, and the G value due to the flow of the water to be treated becomes even smaller. Then, in the bottom side flow path R3, the flocs 1 grow into flocs 1 (hereinafter also referred to as flocs 1c) having a larger particle size than the flocs 1b. That is, the flocs of the water to be treated gradually grow in the process of gravity settling in the bottom side flow path R3. Then, the formed flocs 1c are deposited at the bottom 12.

[0033] Thereafter, the water to be treated that has descended to the bottom-side flow passage R3 flows from the bottom-side flow passage R3 into the lower-side flow passage R4 by an upward flow, as shown in Fig. 9. Then, the treated water that has flowed into the lower-side flow passage R4 flows out of the outlet pipe 42 via the outlet port 11b, as shown in Fig. 9.

[0034] Here, the flocs 1c deposited on the bottom 12 are flocs having a particle size sufficiently larger than that of the flocs 1a and 1b. Therefore, the flocs 1c do not rise due to the upward flow from the bottom flow passage R3 to the lower flow passage R4, and do not flow into the lower flow passage R4. In other words, flocs having a faster settling flow rate than the outflow rate (upward flow rate) of the treated water are separated. Therefore, the mixing and clarification apparatus 100 is capable of separating the flocs 1c from the water to be treated.

[0035] Thus, the mixing and turbidity removal device 100 in this embodiment includes a substantially cylindrical tank 10 having a bottom 12, a substantially cylindrical tube 20 that is provided inside the tank 10 so that its axial direction is substantially the same as that of the tank 10 and has an open upper surface 21a and lower surface 21b, an inflow pipe 41 through which the water to be treated flows in, an outflow pipe 42 through which the treated water flows out, and a partition 31 that partitions the flow path formed by the inside of the wall 11 and the outside of the wall 21 into an upper flow path R1 and a lower flow path R4 in the axial direction of the tank 10 and the tube 20. The inflow pipe 41 communicates with the upper flow path R1, and the longitudinal direction of the inflow pipe 41 is along the tangential direction in the horizontal cross section of the tank 10, and the outflow pipe 42 communicates with the lower flow path R4.

[0036] That is, in the mixing and turbidity removal apparatus 100 of this embodiment, for example, the longitudinal direction of the inflow pipe 41 is aligned with the tangential direction in the horizontal cross section of the tank 10, so that the water to be treated flows into the upper flow path R1 while maintaining the flow velocity in the inflow pipe 41. Therefore, the mixing and turbidity removal apparatus 100 can agitate the water to be treated without using agitation power. Therefore, the mixing and turbidity removal apparatus 100 can save power.

[0037] Here, in order to form good quality flocs 1, it is generally necessary to make the GT value, which is the product of the G value and the T value in the treated water, equal to or greater than a certain threshold value. Furthermore, in order to prevent the flocs 1 from being destroyed by the shearing action of the water flow, it is preferable to adopt the so-called tapered flocculation method. This tapered flocculation method is a method in which the coagulant is sufficiently stirred with strong stirring intensity (large G value) when the particle size of the flocs 1 is small, and the stirring intensity is weakened (small G value) after the particle size of the flocs 1 has increased.

[0038] In this regard, in the mixing and turbidity removing device 100 of this embodiment, it is possible to increase the G value in the upper flow path R1 and also to decrease the G value in the tubular flow path R2. Therefore, in the mixing and turbidity removing device 100, it is possible to increase the G value when the particle size of the flocs 1 is small and to decrease the G value when the particle size of the flocs 1 becomes large. Also, in the mixing and turbidity removing device 100, it is possible to make the T value in the tubular flow path R2 larger than the T value in the upper flow path R1, so that it is possible to ensure the GT value in each of the upper flow path R1 and the tubular flow path R2.

[0039] In the mixing and turbidity removal apparatus 100 of this embodiment, the G value in the vicinity of the bottom of the upper flow passage R1 (in the vicinity of the partition 31) is larger than the G value in the vicinity of the upper end of the upper flow passage R1. Therefore, in the mixing and turbidity removal apparatus 100, even when focusing on only the upper flow passage R1, it is possible to form flocs according to the tapered flocculation method.

[0040] In addition, the mixing and clarification apparatus 100 of this embodiment has a structure for depositing the flocs 1 (flocs 1c) at the bottom 12 of the tank 10, which eliminates the need to provide a separate settling tank. Therefore, the mixing and clarification apparatus 100 can reduce the installation space.

[0041] [Control of the flow of treated water using a pump] Next, control of the flow of the water to be treated when a pump is used will be described below. Fig. 10 is a diagram for explaining the configuration of the pump and the control device.

[0042] 10, the inflow pipe 41 may be provided with, for example, a first pump P11 that discharges the water to be treated toward the tank 10 (upper flow path R1). The outflow pipe 42 may be provided with, for example, a second pump P12 that sucks the water to be treated from the tank 10 (lower flow path R4). That is, at least one of the first pump P11 and the second pump P12 may be provided.

[0043] Furthermore, a control device 60 for controlling the driving of at least one of the first pump P11 and the second pump P12 may be installed outside the mixing and clarification device 100. The control device 60 is, for example, a computer device having a CPU (Central Processing Unit) and a memory. Specifically, the control device 60 controls at least one of the first pump P11 and the second pump P12 so that the G value caused by the flow of the water to be treated in the upper flow path R1 is greater than the G value caused by the flow of the water to be treated in the cylindrical flow path R2.

[0044] This makes it possible to more accurately control the formation of good quality flocs in the mixing and turbidity apparatus 100. In particular, in the mixing and turbidity apparatus 100, for example, by installing the first pump P11 downstream of the position where the coagulant is supplied to the water to be treated, it becomes possible to further increase the G value in the upper flow path R1.

[0045] Generally, when the concentration of flocs in the water to be treated (hereinafter also referred to as C0) is high, good quality flocs can be formed even when the GT value is small. Therefore, for example, when C0 in the water to be treated is high, the control device 60 may control the G value due to the flow of the water to be treated in the upper flow path R1 so that the GT value becomes small. Also, for example, when C0 in the water to be treated is small, the control device 60 may control the G value due to the flow of the water to be treated in the upper flow path R1 so that the GT value becomes large.

[0046] [Mixing and clarification device 200 in the second embodiment] Fig. 11 is a configuration diagram of the mixing and turbidity device 200 in the second embodiment. Specifically, Fig. 11 is a vertical cross-sectional view of the mixing and turbidity device 200 in the second embodiment as viewed from the front.

[0047] In the mixing and turbidity removal device 100 shown in Fig. 1, points P1 and P2 each indicate a position where the treated water flows into the lower flow path R4. Specifically, point P1 indicates the position where the treated water flows into the lower flow path R4 that is the furthest from the outlet 11b. Point P2 indicates the position where the treated water flows into the lower flow path R4 that is the closest from the outlet 11b.

[0048] Here, the treated water that flows into the lower flow passage R4 at point P1 reaches the outlet 11b (outlet pipe 42) via a flow passage along the outer periphery of the tube 20. In contrast, the treated water that flows into the lower flow passage R4 at point P2 reaches the outlet 11b via only the upward flow passage, without passing through a flow passage along the outer periphery of the tube 20. Therefore, the treated water that flows into the lower flow passage R4 at point P1 must pass through a longer flow passage to reach the outlet 11b than the treated water that flows into the lower flow passage R4 at point P2.

[0049] 1, the flow rate of the treated water flowing from the bottom flow passage R3 to the lower flow passage R4 may differ depending on the position where the treated water flows into the lower flow passage R4. Therefore, in the mixing and turbidity apparatus 100 shown in FIG 1, for example, at a position where the flow rate of the treated water from the bottom flow passage R3 to the lower flow passage R4 is high, the flocs 1c deposited on the bottom 12 may be sucked in.

[0050] Therefore, in the second embodiment, the mixing and clarification device 200 has, instead of the tube 20 described in Figure 1 etc., a tube 50 (wall portion 51) whose lower edge is inclined relative to the horizontal direction, as shown in Figure 11.

[0051] 11, the mixing and turbidity device 200 can reduce the difference between the distance of the lower flow passage R4 from point P3, which is the farthest from the outlet 11b among the positions where the treated water flows into the lower flow passage R4, to the outlet 11b, and the distance of the lower flow passage R4 from point P2, which is the closest from the outlet 11b among the positions where the treated water flows into the lower flow passage R4, to the outlet 11b. Therefore, the mixing and turbidity device 200 can reduce the difference in the flow speed of the treated water at each position where it flows into the lower flow passage R4, and can suppress the suction of the flocs 1c accumulated on the bottom 12.

[0052] Furthermore, the shape of the lower edge of the tube 50 is preferably such that, for example, the distance from each position where the treated water flows into the lower flow passage R4 to the outlet 11b is constant.

[0053] 11, the distance of the lower flow path R4 from point P3 to the outlet 11b is, for example, half the outer periphery in the horizontal cross section of the tube 50. Therefore, in this case, the distance of the lower flow path R4 from point P2 to the outlet 11b (i.e., the vertical distance from point P2 to the outlet 11b) is preferably half the outer periphery in the horizontal cross section of the tube 50.

[0054] This enables the mixing and clarification device 200 to better reduce the difference in flow rate of the treated water at each position where it flows into the lower flow path R4, and to better prevent the suction of flocs 1c accumulated on the bottom 12. [Explanation of symbols]

[0055] 1: Flock 1a: Flock 1b: Flock 1c: Flock 10: Tank 11: Wall 11a: Inlet 11b: Outlet 12: Bottom 13: Floc discharge pipe 20:Cylinder 21:Wall 21a: Top surface 21b: Bottom surface 31: Partition 32: Valve 41: Inlet pipe 42: Outlet pipe 50:Cylinder 51:Wall part 60: Control device 100: Mixing and turbidity removal device 200: Mixing clarifier R1: Upper channel R2: Cylindrical flow path R3: Bottom flow path R4: Lower flow passage P11: First pump P12: Second pump

Claims

1. A generally cylindrical vessel having a bottom; a substantially cylindrical tube that is provided inside the tank so that its axial direction substantially coincides with that of the tank and that has an open upper and lower surfaces; an inflow pipe into which the water to be treated flows; an outflow pipe through which the treated water flows out; a partition portion that partitions a flow path formed by an inner side wall of the tank and an outer side wall of the cylinder into an upper flow path and a lower flow path in an axial direction of the tank and the cylinder, The inlet pipe is in communication with the upper flow passage, The outlet pipe is in communication with the lower flow path, A mixing and clarification device, wherein the lower edge of the tube has a shape that is inclined with respect to the horizontal cross section of the tank.

2. A mixing and turbidity removal device, A generally cylindrical vessel having a bottom; a substantially cylindrical tube that is provided inside the tank so that its axial direction substantially coincides with that of the tank and that has an open upper and lower surfaces; an inflow pipe into which the water to be treated flows; an outflow pipe through which the treated water flows out; a partition portion that partitions a flow path formed by an inner side wall of the tank and an outer side wall of the cylinder into an upper flow path and a lower flow path in an axial direction of the tank and the cylinder, The inlet pipe is in communication with the upper flow passage, The outlet pipe is in communication with the lower flow path, Further, at least one of a pump provided on the inflow pipe side for discharging the water to be treated to the mixing and clarification device and a pump provided on the outflow pipe for sucking the treated water from the mixing and clarification device; A control device that controls the operation of the pump, The control device controls the pump so that the stirring strength caused by the flow of the water to be treated in the upper flow path is greater than the stirring strength caused by the flow of the water to be treated inside the side wall of the tube.

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