Pipe-type agitation granulation unit and pipe-type agitation granulation solid-liquid separation device

Abstract

To provide a piping type agitation granulation unit which has simple structure and control and easily secures a flow speed suitable for granulation even when an amount of raw water varies.SOLUTION: A piping type agitation granulation unit comprises an agitation module, an addition part, a shutter member, and a control part. The agitation module has a plurality of individual tubular members in parallel to each other in which spiral elements are fixed in a flow passage in which raw water can flow, and performs agitation of the flowing raw water for each individual tubular member. The addition part is arranged on the upstream side of the agitation module and adds a chemical for forming floc to the raw water flowing through the individual tubular member. The shutter member is a plate-like member which is arranged in at least one of the upstream end and the downstream end of the agitation module, and is movable between the fully-close position of closing all the flow passages of the individual tubular members and the open position of opening at least one of the flow passages. The control part decides the individual tubular member to be used in treating the raw water by controlling the movement position of the shutter member.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a pipe-type agitation granulation unit and a pipe-type agitation granulation solid-liquid separation device. [Background technology]

[0002] Conventionally, solid-liquid separators have been used in water purification plants, industrial wastewater treatment plants, power plants, and the like to separate and remove suspended solids such as metal ions, organic matter, and inorganic salts from raw water. Known examples of solid-liquid separators include systems that use centrifugal separation technology. In the case of solid-liquid separators that use centrifugal separation technology, for example, after pretreatment to flocculate solids contained in the raw water, the raw water containing the flocs is fed into a centrifuge, and flocs having a particle size of a predetermined size or larger are separated from the raw water by utilizing centrifugal force.

[0003] In the case of a solid-liquid separation device using a centrifuge as described above, it is desirable to form flocs of high density and high strength so that the flocs formed in the pretreatment process do not break up or become finer due to centrifugal force. For this reason, there are systems that include a flocculation tank in the pretreatment process. In addition, as a system that can be made more compact overall than a system that includes a flocculation tank, a system has been proposed in which flocs are formed by adding chemicals such as inorganic coagulants, cationic polymer coagulants, or anionic polymer coagulants to raw water and then stirring and granulating the mixture. In this system, a technique that uses a pipe-type mixer, for example, has been proposed as a technique for stirring the added chemicals with the raw water. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4875129 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-214248 [Patent Document 3] Patent No. 5907273 [Patent Document 4] Patent No. 6805282 Summary of the Invention [Problem to be solved by the invention]

[0005] When using a pipe-type mixer such as the one described above, it is necessary to use a large-diameter mixing tube (agitation module) or to use multiple small-diameter mixing tubes arranged in parallel so as to be able to respond to fluctuations (increases and decreases) in the amount of raw water being treated. However, when using a large-diameter mixing tube, if the amount of raw water to be treated decreases, there is a problem that the flow rate decreases, making it impossible to achieve sufficient granulation, or that aggregated solids settle in the mixing tube. On the other hand, when using multiple small-diameter mixing tubes arranged in parallel, by providing and controlling a flow control valve or the like for each small-diameter mixing tube, it is possible to adjust the flow rate according to the amount of raw water to be treated, but there is a problem that the structure and control become complicated.

[0006] Therefore, it would be meaningful to provide a pipe-type agitation granulation unit that is easy to structure and control, and that can easily ensure a flow rate suitable for granulation even when the amount of raw water to be treated fluctuates. [Means for solving the problem]

[0007] The pipe-type agitation granulation unit in the embodiment includes, for example, an agitation module, an addition unit, a shutter member, and a control unit. The agitation module arranges a plurality of individual tubular members, each with a spiral element fixed thereto, in parallel in a flow path through which the raw water to be treated can flow, and agitates the raw water flowing through each individual tubular member. The addition unit is arranged upstream of the agitation module and adds a chemical to form flocs to the raw water flowing through the individual tubular members. The shutter member is arranged at least at one of the upstream and downstream ends of the agitation module and is a plate-shaped member that can move between a fully closed position that closes all of the flow paths of the plurality of individual tubular members and an open position that opens at least one of the flow paths of the plurality of individual tubular members. The control unit controls the movement position of the shutter member to determine the individual tubular member to be used for treating the raw water. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing the configuration of a piping-type agitation granulation solid-liquid separation apparatus including a piping-type agitation granulation unit according to an embodiment. [Figure 2] FIG. 2 is a front view showing the first gate valve (first shutter member) included in the piping type agitation granulation unit in the embodiment, viewed from the upstream side, with the upstream end of the individual tubular member in an open state. [Figure 3] FIG. 3 is a front view showing the second gate valve (second shutter member) included in the piping type agitation granulation unit in the embodiment, viewed from the downstream side, with the downstream end of the individual tubular member in an open state. [Figure 4] FIG. 4 is a front view showing the individual tubular members, which become available by controlling the first shutter member and the second shutter member included in the piping type agitation granulation unit in the embodiment, as viewed from the downstream side. [Figure 5] FIG. 5 is a front view showing the individual tubular members, viewed from the downstream side, that can be used to accommodate large flows by controlling the first and second shutter members included in the piping-type agitation granulation unit in this embodiment. [Figure 6] FIG. 6 is a front view showing an individual tubular member, seen from the downstream side, when responding to a small flow rate and which becomes available by controlling the first shutter member and the second shutter member included in the piping-type agitation granulation unit in the embodiment. [Figure 7] FIG. 7 is a graph showing changes in turbidity and suspended solids (SS) of treated water when the amount of flocculant added is changed in the flocculant addition section of the piping type agitation granulation unit in the embodiment. [Figure 8] FIG. 8 is a graph showing the change in metal ion concentration of treated water when pH is adjusted with a pH adjuster added in a pH adjuster adding section of a piping-type agitation granulation unit according to an embodiment. [Figure 9]Figure 9 is a front view showing the open state of the downstream end of the individual tubular member when viewed from the downstream side, in which the first shutter member of the first gate valve and the second shutter member of the second gate valve included in the piping-type agitation granulation unit in the embodiment are each made up of two members. [Figure 10] Figure 10 is a front view showing another open state of the downstream end of the individual tubular member when viewed from the downstream side, in which the first shutter member of the first gate valve and the second shutter member of the second gate valve included in the piping-type agitation granulation unit in the embodiment are each made up of two members. [Figure 11] FIG. 11 is a front view showing that the open state of the ends of the individual tubular members of each agitation module is changed by the operation of the first to fourth shutter members included in the piping-type agitation granulation unit in this embodiment. [Figure 12] FIG. 12 is a front view seen from the downstream side showing variations in the moving direction of the shutter member included in the piping type agitation granulation unit in the embodiment. [Figure 13] FIG. 13 is a front view seen from the upstream side showing a case where the shutter members included in the piping type agitation granulation unit in the embodiment are configured with three shutter members. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The configurations of the embodiments described below, as well as the actions and results (effects) brought about by the configurations, are merely examples and are not limited to the following description.

[0010] FIG. 1 is a configuration diagram showing the configuration of a piping-type agitation granulation and solid-liquid separation apparatus 100 including a piping-type agitation granulation unit 10 and a solid-liquid separation unit 12 according to an embodiment.

[0011] In the case of the pipe-type agitation granulation solid-liquid separation apparatus 100 shown in FIG. 1, a configuration in which multiple (e.g., three) pipe-type agitation granulation units 10 (10A, 10B, 10C) are connected in series is shown. However, the number of connected pipe-type agitation granulation units 10 can be changed as appropriate depending on the specifications of the water treatment plant including the pipe-type agitation granulation solid-liquid separation apparatus 100 and the type and condition of the raw water W0 to be treated. Therefore, the number of connected pipe-type agitation granulation units 10 in the pipe-type agitation granulation solid-liquid separation apparatus 100 may be one or two or more depending on the application. Note that in FIG. 1, each pipe-type agitation granulation unit 10 (10A-10C) has the same basic configuration, and when it is necessary to distinguish them in the description, they will be referred to as the first pipe-type agitation granulation unit 10A, the second pipe-type agitation granulation unit 10B, the third pipe-type agitation granulation unit 10C, etc., and when it is not necessary to distinguish them, they will be referred to as the pipe-type agitation granulation unit 10.

[0012] 1, for convenience of explanation, the direction in which the pipe-type agitation granulation units 10 are arranged in series is referred to as the X direction, the flow direction of the raw water W0 (downstream direction) is referred to as the X1 direction, and the opposite direction (upstream direction) is referred to as the X2 direction. The vertical direction of the paper, which is perpendicular to the X direction, is referred to as the Y direction, the upward direction of the paper is referred to as the Y1 direction, and the downward direction of the paper is referred to as the Y2 direction. The vertical direction of the paper, which is perpendicular to the X direction, is referred to as the Z direction, the direction toward the back of the paper is referred to as the Z1 direction, and the direction toward the front of the paper is referred to as the Z2 direction.

[0013] The piping type agitation granulation unit 10 includes an agitation module 14, an aggregating agent addition section 16 and a pH adjuster addition section 18 as addition sections, a shutter member 20, a control section 22, and the like.

[0014] The agitation module 14 has a plurality of individual tubular members 24 extending in the X direction, each of which has a spiral element 26 fixed to a flow path 24a through which the raw water W0 to be treated can flow, arranged in parallel (bundled together). The individual tubular members 24 agitate the flowing raw water W0 through each of the individual tubular members 24. The individual tubular members 24 are, for example, well-known line mixers (static mixers). The flow path 24a is, for example, a hollow cylindrical pipe flow path, a static mixer with an element 26 fixed inside and no drive unit. The agitation module 14 has, for example, a plurality of individual tubular members 24 (60 are shown in the example of FIG. 2, which will be described later) bundled in parallel and housed in, for example, a cylindrical housing 28. The diameter and number of the individual tubular members 24 to be used (bundled) can be determined (designed) based on prior experimental results and other factors, such as the amount and properties of the raw water W0 to be treated. When the raw water W0 flows (passes) through the individual tubular member 24, a swirling flow is generated by the action of the spiral element, and a strong shear force is applied to the raw water W0. As a result, when the raw water W0 flows (passes) through the individual tubular member 24, the raw water W0 is stirred and mixed with the flocculant added in the flocculant adding section 16 and the pH (hydrogen ion concentration) adjuster added in the pH adjuster adding section 18.

[0015] In the case of the piping type agitation granulation solid-liquid separation apparatus 100 of FIG. 1, the end of the agitation module 14 is provided with a gate valve 30 that supports the shutter member 20 so that it can move in the Y1 and Y2 directions or the Z1 and Z2 directions in the figure.

[0016] For example, in the case of the first piping type agitation granulation unit 10A, a first gate valve 30A supporting a first shutter member 20A is fixed in a watertight manner to the upstream end portion 10Aa into which the raw water W0 flows.

[0017] FIG. 2 is a front view of the first gate valve 30A (first shutter member 20A) provided upstream of the first piping-type agitation and granulation unit 10A (first agitation module 14A) showing the open state of the upstream end of the individual tubular members 24 when viewed from the upstream side. The first shutter member 20A is movable in the Y1 and Y2 directions in the figure. When it moves to its terminal position in the Y1 direction, it enters a first open state, allowing the inflow of raw water WO into all of the individual tubular members 24 constituting the first piping-type agitation and granulation unit 10A. Furthermore, when the first shutter member 20A moves from the first open state to the Y2 direction, the inlets on the upstream side of the individual tubular members 24 are sequentially blocked depending on the amount of movement (first open position), preventing the inflow of raw water WO. In other words, the blocked individual tubular members 24 become unusable, and only the unblocked individual tubular members 24 allow the inflow of raw water WO. That is, the first shutter member 20A is movable between a fully open position and a fully closed position so as to open at least one individual tubular member 24. The other shutter members 20 are similarly movable.

[0018] As shown in FIG. 1, a second gate valve 30B supporting a second shutter member 20B is fixed in a watertight manner to a downstream end 10Ab of the first piping-type agitation granulation unit 10A.

[0019] FIG. 3 is a front view of the second gate valve 30B (second shutter member 20B) provided downstream of the first piping-type agitation and granulation unit 10A (first agitation module 14A) showing the open state of the downstream end of the individual tubular member 24 when viewed from the downstream side. The second shutter member 20B is movable in the Z1 and Z2 directions in the figure. When it moves to its terminal position in the Z1 direction, it enters a second open state, allowing the outflow of raw water WO from all of the individual tubular members 24 constituting the first piping-type agitation and granulation unit 10A. Furthermore, when the second shutter member 20B moves from the second open state in the Z2 direction, the outlets downstream of the individual tubular members 24 are sequentially blocked depending on the amount of movement (second open position), preventing the outflow of raw water WO. In other words, the blocked individual tubular members 24 become unusable, and only the unblocked individual tubular members 24 allow the outflow of raw water WO.

[0020] In this way, the shutter members 20 are provided on the upstream and downstream sides of the agitation module 14. Therefore, the individual tubular members 24 that are blocked by at least one of the first shutter member 20A and the second shutter member 20B cannot be used.

[0021] Figure 4 is a front view showing the individual tubular members 24, viewed from the downstream side, that become available by controlling the first shutter member 20A supported by the first gate valve 30A (not shown) and the second shutter member 20B supported by the second gate valve 30B included in the first piping-type agitation granulation unit 10A (first agitation module 14A).

[0022] For example, if the upstream inlet of an individual tubular member 24 is blocked by the first shutter member 20A, no flow of raw water WO occurs within the blocked individual tubular member 24, regardless of whether or not it is blocked by the second shutter member 20B. Also, even if the upstream inlet of an individual tubular member 24 is not blocked by the first shutter member 20A, if its outlet is blocked downstream by the second shutter member 20B, no flow of raw water WO occurs within the blocked individual tubular member 24. In other words, agitation of raw water WO is not performed in individual tubular members 24 blocked by at least one of the first shutter member 20A and the second shutter member 20B. In the case of FIG. 4 , only the 17 individual tubular members 24 indicated by solid lines in the lower left region allow the inflow and outflow of raw water WO, and agitation is performed by the flow of raw water WO.

[0023] 5 is a front view showing the individual tubular members 24 viewed from the downstream side (the second gate valve 30B side) when coping with a large flow of raw water W0, which becomes available by control of the first shutter member 20A supported by the first gate valve 30A (not shown) and the second shutter member 20B supported by the second gate valve 30B of the first piping-type agitation granulation unit 10A (first agitation module 14A). In the example shown in FIG. 5, the inlet side of the individual tubular member 24 is blocked by the first shutter member 20A, and the outlet side of the individual tubular member 24 is blocked by the second shutter member 20B. As a result, raw water W0 can flow through, for example, 45 individual tubular members 24 shown by solid lines, enabling agitation of a large amount of raw water W0. Furthermore, by moving the first shutter member 20A to its terminal position in the Y1 direction and moving the second shutter member 20B to its terminal position in the Z1 direction, all 60 individual tubular members 24 can be used to flow (stir) the raw water W0.

[0024] 6 is a front view showing the individual tubular members 24 viewed from the downstream side (the second gate valve 30B side) when a small flow of raw water WO is accommodated, which becomes available by controlling the first shutter member 20A supported by the first gate valve 30A (not shown) and the second shutter member 20B supported by the second gate valve 30B of the first piping-type agitation granulation unit 10A (first agitation module 14A). In the example shown in FIG. 6, the inlet side of the individual tubular member 24 is blocked by the first shutter member 20A, and the outlet side of the individual tubular member 24 is blocked by the second shutter member 20B. As a result, raw water WO can flow through, for example, nine individual tubular members 24 shown by solid lines, enabling agitation of a small amount of raw water WO. Furthermore, by moving the first shutter member 20A to its terminal position in the Y2 direction or moving the second shutter member 20B to its terminal position in the Z2 direction, all 60 individual tubular members 24 can be blocked and the flow (stirring) of the raw water W0 can be stopped.

[0025] In this way, the first open position of the first shutter member 20A at the upstream end of the first piping-type agitation and granulation unit 10A and the second open position of the second shutter member 20B at the downstream end of the first piping-type agitation and granulation unit 10A are controlled to be different from each other. As a result, the positions and number of individual tubular members 24 used to treat the raw water W0 can be determined by combining the first open position of the first shutter member 20A and the second open position of the second shutter member 20B. In other words, the opening and closing variations (control variations) of the individual tubular members 24 can be easily improved. Furthermore, since the first shutter member 20A and the second shutter member 20B can collectively control the opening and closing of multiple individual tubular members 24 by simple linear movement, the structure is simpler and control is easier than when the individual tubular members 24 are individually controlled to open and close. As a result, this contributes to reducing design costs, manufacturing costs, operating costs, and the like.

[0026] As shown in FIG. 1, a first flocculant addition unit 16A is connected to the first gate valve 30A as the flocculant addition unit 16. A predetermined amount of the first flocculant is pumped by a pump 16Aa and supplied to the first gate valve 30A, where it is added to the raw water W0 flowing in from the raw water inlet passage 32. Similarly, a second flocculant addition unit 16B is connected to the second gate valve 30B. A predetermined amount of the second flocculant is pumped by a pump 16Ba and supplied to the second gate valve 30B, where it is added to the raw water W0 to which the first flocculant has been added and stirred in the first mixing module 14A. A third flocculant addition unit 16C is connected to the third gate valve 30C. A predetermined amount of the third flocculant is pumped by a pump 16Ca and supplied to the third gate valve 30C. That is, the first agitation module 14A adds the first flocculant, the second agitation module 14B adds the second flocculant, and the raw water W0 is agitated, and then the third flocculant is further added to the agitated raw water W0.

[0027] The first flocculant addition unit 16A, the second flocculant addition unit 16B, and the third flocculant addition unit 16C are filled with, for example, different types of flocculants, and when the first shutter member 20A, the second shutter member 20B, and the third shutter member 20C are opened to allow the inflow of raw water W0, a predetermined amount of additive is added to the individual tubular members 24 relative to the flow rate of raw water W0. The first flocculant addition unit 16A adds, for example, an inorganic flocculant as a first flocculant to the first gate valve 30A (first stirring module 14A), the second flocculant addition unit 16B adds, for example, a cationic polymer flocculant as a second flocculant to the second gate valve 30B (second stirring module 14B), and the third flocculant addition unit 16C adds, for example, an anionic polymer flocculant as a third flocculant to the third gate valve 30C (third stirring module 14C). The flocculants added by each flocculant adding unit 16 are not limited to those described above, and can be changed as appropriate depending on the state of the raw water W0, the substances to be removed, and the usage status of the pipe-type agitation granulation solid-liquid separation apparatus 100. In addition, multiple types of flocculants may be added to the same gate valve 30.

[0028] A pH adjuster adding section 18 is connected to a raw water inlet flow path 32 connected to the upstream side of the piping-type agitation granulation unit 10. A predetermined amount of pH adjuster is pressure-fed by a pump 18a and supplied to the raw water inlet flow path 32, where it is added to the raw water W0.

[0029] As shown in FIG. 1, a first gate valve 30A (a first shutter member 20A movable in the Y1-Y2 direction) is disposed on the upstream side (inlet side) of the first piping type agitation granulation unit 10A (first agitation module 14A). A second gate valve 30B (a second shutter member 20B movable in the Z1-Z2 direction) is disposed on the downstream side (outlet side) of the first piping type agitation granulation unit 10A. A second gate valve 30B (a second shutter member 20B) shared with the first piping type agitation granulation unit 10A is disposed on the upstream side (inlet side) of the second piping type agitation granulation unit 10B (second agitation module 14B). A third gate valve 30C (a third shutter member 20C movable in the Y1-Y2 direction) is disposed on the downstream side (outlet side) of the second piping type agitation granulation unit 10B. Furthermore, a third gate valve 30C (third shutter member 20C) that is shared with the second piping type agitation granulation unit 10B is disposed on the upstream side (inlet side) of the third piping type agitation granulation unit 10C (third agitation module 14C). A fourth gate valve 30D (fourth shutter member 20D that can move in the Z1-Z2 direction) is disposed on the downstream side (outlet side) of the third piping type agitation granulation unit 10C. Therefore, by controlling the movement positions of the first shutter member 20A and the third shutter member 20C to be the same and the movement positions of the second shutter member 20B and the fourth shutter member 20D to be the same, the individual tubular members 24 that are located in the same position in the first piping type agitation granulation unit 10A, the second piping type agitation granulation unit 10B, and the third piping type agitation granulation unit 10C can be used. In this case, by determining the number of individual tubular members 24 that can be used depending on the inflow amount of raw water W0 (amount to be treated), the flow rate of the raw water W0 can be set to a value suitable for agitating the flocculant and pH adjuster and for agglomerating and granulating solids contained in the raw water W0, and the flow rate of the raw water W0 flowing through the pipe-type agitation and granulation unit 10 can be made almost uniform overall. As a result, this can contribute to stabilizing the agitation and granulation quality in the pretreatment process of the raw water W0.

[0030] 1, the X-direction lengths of the first and second agitation modules 14A and 14B are approximately the same, while the X-direction length of the third agitation module 14C is longer than those of the first and second agitation modules 14A and 14B. The first and second agitation modules 14A and 14B agitate the raw water W0 with the coagulant and pH adjuster added upstream. Meanwhile, the third agitation module 14C not only agitates the raw water W0 with the coagulant and pH adjuster added upstream, but also aggregates and granulates solids in the raw water W0. The length of the third agitation module 14C is set (designed) based on prior experiments, etc., to ensure the time required for the flocs to grow into flocs with strong binding strength that will not break down even when centrifuged in the solid-liquid separation unit 12 located downstream of the third agitation module 14C. The lengths of the first stirring module 14A and the second stirring module 14B may also be determined appropriately depending on the stirring time required for the flocculant and pH adjuster, and the stirring time required for flocculation and granulation by the flocculant that has already been added.

[0031] A flow rate detection unit 34 and a pressure detection unit 36 are disposed in the raw water inlet flow path 32. The flow rate detection unit 34 can measure the flow rate of the raw water W0 flowing into the pipe-type agitation granulation, solid-liquid separation apparatus 100. The pressure detection unit 36 can measure the water pressure of the raw water W0 flowing into the pipe-type agitation granulation, solid-liquid separation apparatus 100. By detecting the flow rate and water pressure of the raw water W0 flowing into the pipe-type agitation granulation, solid-liquid separation apparatus 100, it is possible to grasp the state of the raw water W0 flowing in the agitation module 14. The detection results obtained by the flow rate detection unit 34 and the pressure detection unit 36 are provided to the first control unit 22A. The first control unit 22A controls the movement state of each shutter member 20 (20A-20D) based on the flow rate and water pressure of the raw water W0 so that the flow velocity of the raw water W0 becomes a value suitable for agitating the raw water W0, i.e., for generating flocs. That is, the number of individual tubular members 24 through which the raw water W0 can flow is determined so as to form a flow path diameter that will result in a predetermined flow velocity when the raw water W0 passes through each piping-type agitation granulation unit 10 when it is pumped at a predetermined water pressure by a pump (not shown) or the like from the upstream side of the piping-type agitation granulation solid-liquid separation apparatus 100. Each shutter member 20 can be continuously operated by a drive device such as an electric motor or a fluid pressure cylinder.

[0032] As shown in FIG. 1, a solid-liquid separation unit 12 is connected downstream of the piping-type agitation granulation solid-liquid separation apparatus 100. A known solid-liquid separation device can be used for the solid-liquid separation unit 12. The solid-liquid separation unit 12 includes, for example, multiple cone-shaped cyclones formed by combining a cylindrical section and a hollow cone section. The solid-liquid separation unit 12 performs centrifugation treatment by introducing raw water W0 containing flocs supplied from the third piping-type agitation granulation unit 10C into the cyclones. The raw water W0 flowing into the solid-liquid separation unit 12 is separated into treated water W1 from which solids have been removed by centrifugal force, sludge S representing the separated and removed solids, and blown water W2 generated by blowdown performed to improve separation efficiency. The sludge S and blown water W2 are separated in the blowdown section 42. The sludge S is appropriately discharged by opening a valve 44. On the other hand, the blow water W2 is sequentially returned to the upstream side of the piping type agitation granulation and solid-liquid separation apparatus 100.

[0033] A first water quality detector 46 is provided in the discharge flow path 38 for the treated water W1, and a second water quality detector 48 is provided in the return flow path 40 for the blown water W2, and each constantly monitors the water quality. Well-known detection devices can be used for the first water quality detector 46 and the second water quality detector 48, and the water quality monitored by each detector is determined based on the raw water W0 to be treated, such as turbidity, metal ion concentration, and solids content. Therefore, the first water quality detector 46 and the second water quality detector 48 have detection functions corresponding to the determined water quality detection. Signals (detection results) output from the first water quality detector 46 and the second water quality detector 48 are provided to the second control unit 22B. Based on the detection results from the first water quality detector 46 and the second water quality detector 48, the second control unit 22B controls the type and amount of flocculant added in the flocculant addition unit 16 and the amount of pH adjuster added in the pH adjuster addition unit 18.

[0034] FIG. 7 is a graph showing the changes in turbidity and suspended solids (SS) of treated water when the amount of inorganic flocculant added by the flocculant addition section 16 of the pipe-type agitation granulation unit 10 is changed. The left vertical axis represents the turbidity of treated water W1. Turbidity is an index that indicates the degree of turbidity of water, with 1 degree representing the turbidity when 1 mg of formazin is contained in 1 liter of water. The right vertical axis represents the SS of treated water. The SS of treated water is the weight (mg / L) of suspended solids, or suspended solids, which are substances with particle sizes of 1 μm to 2 mm that are suspended or dispersed in water. In this way, by controlling the amount of flocculant added by the flocculant addition section 16 using the first water quality detection section 46, the second water quality detection section 48, and the second control section 22B, the accuracy and quality of water quality control in the pipe-type agitation granulation solid-liquid separation apparatus 100 can be improved even when the water quality of the raw water W0 varies.

[0035] 8 is a graph showing changes in water quality (metal ion concentration) when pH is adjusted with a pH adjuster added in the pH adjuster adding section 18 of the piping-type agitation granulation unit 10. In this way, by controlling the amount of pH adjuster added in the pH adjuster adding section 18 using the first water quality detection section 46, the second water quality detection section 48, and the second control section 22B, it is possible to improve the accuracy and quality of water quality control in the piping-type agitation granulation solid-liquid separation apparatus 100 even when the water quality of the raw water W0 fluctuates.

[0036] In this way, the second control unit 22B can adjust at least one of the amount and type of chemicals (flocculant or pH adjuster) added in the flocculant addition unit 16 or the pH adjuster addition unit 18 based on the state of the treated water W1 (treated fluid) discharged from the pipe-type agitation granulation unit 10 and subjected to post-treatment (solid-liquid separation treatment) in the solid-liquid separation unit 12, thereby enabling more stable water quality management.

[0037] As described above, the control unit 22 (first control unit 22A) may determine the number of individual tubular members 24 to be used in treating the raw water W0 based on the state of the treated water W1 discharged from the piping-type agitation and granulation unit 10 and subjected to post-treatment (solid-liquid separation treatment) by the solid-liquid separation unit 12. In this case, the raw water W0 to which an appropriate amount of chemicals (such as a flocculant or pH adjuster) has been added by the second control unit 22B can be caused to flow at an optimal flow rate, thereby achieving optimal agitation, agglomeration, granulation, etc. As described above, the control unit 22 (first control unit 22A) controls the opening position of the shutter member 20 based on the treatment amount of the raw water W0 flowing into the piping-type agitation and granulation unit 10 and determines the number of individual tubular members 24 to be used in treating the raw water W0. Therefore, the raw water W0 to which an appropriate amount of chemicals (such as a flocculant or pH adjuster) has been added by the second control unit 22B can be caused to flow at an optimal flow rate, thereby achieving optimal agitation, agglomeration, granulation, etc.

[0038] Although FIG. 1 shows a configuration in which the first control unit 22A and the second control unit 22B are provided, the first control unit 22A and the second control unit 22B may be collectively referred to as the control unit 22.

[0039] In a pipe-type agitation granulation unit, if the number of pipes that allow the flow of raw water W0 is always the same, fluctuations in the flow rate of raw water W0 will cause fluctuations in the flow rate of raw water W0 flowing through the individual tubular members 24. For example, if the flow rate of raw water W0 decreases, the flow rate within the individual tubular members 24 will decrease, which may reduce the shear force applied to the raw water W0 and result in reduced coagulation and granulation performance. Conversely, if the flow rate of raw water W0 increases, the flow rate within the individual tubular members 24 will increase, which will increase the shear force applied to the raw water W0 and improve coagulation and granulation performance, but this may increase energy costs due to increased pressure loss. Thus, if the number of individual tubular members 24 that allow the flow of raw water W0 is always constant, coagulation and granulation processing may become unstable and may result in losses in operating costs. On the other hand, in the case of the pipe-type agitation granulation unit 10 of this embodiment, the flow rate and water pressure of the raw water W0 flowing into the pipe-type agitation granulation unit 10 (pipe-type agitation granulation solid-liquid separation apparatus 100) are monitored by the flow rate detection unit 34 and pressure detection unit 36, and the position of the shutter member 20 is controlled according to fluctuations in the flow rate of the raw water W0, thereby controlling the number of individual tubular members 24 through which the raw water W0 flows. As a result, the flow rate within the individual tubular members 24 is always kept approximately constant, making it possible to maintain approximately constant aggregation and granulation performance, and maintaining stable water quality. In addition, stabilizing pressure loss can suppress increases in energy costs for operating the pipe-type agitation granulation unit 10 (pipe-type agitation granulation solid-liquid separation apparatus 100).

[0040] 9 and 10 are front views showing the open state of the downstream ends of the individual tubular members 24 when viewed from the downstream side of a piping-type agitation granulation unit 10 in which one gate valve 30 is equipped with multiple (e.g., two) shutter members 20. In the case of Fig. 9, the first gate valve 30A (not shown) included in the first piping-type agitation granulation unit 10A includes first shutter members 20Aa and 20Ab, which are movable in the Y1 and Y2 directions, respectively. The second gate valve 30B includes second shutter members 20Ba and 20Bb, which are movable in the Z1 and Z2 directions, respectively.

[0041] 9 and 10, by providing one gate valve 30 with multiple (for example, two) shutter members 20, the positions of the individual tubular members 24 that allow the flow of raw water W0 can be selected in more detail. For example, even when selecting 12 individual tubular members 24 that allow the flow of raw water W0, the individual tubular members 24 can be selected in 4 rows and 3 columns in the central region of the first agitation module 14A as shown in Fig. 9, or the individual tubular members 24 can be selected in 6 rows and 2 columns in the left region of the first agitation module 14A as shown in Fig. 10.

[0042] In this way, changing the selected positions of the individual tubular members 24 improves the flexibility of selecting the individual tubular members 24 used for the flow of raw water WO. For example, if the pipe-type agitation and granulation unit 10 is used for a long period of time, aggregated and granulated solids may adhere to and accumulate on the inner walls of the individual tubular members 24, blocking part of the flow path and increasing pressure loss. In such cases, even if the number of individual tubular members 24 used is controlled, it may not be possible to maintain the flow rate of the raw water WO. Therefore, for example, by changing the positions of the individual tubular members 24 used (controlling the opening positions) while maintaining the number of individual tubular members 24 used based on the detection results obtained from the pressure detection unit 36, it is possible to avoid the individual tubular members 24 with accumulated solids as described above and avoid the problem. As a result, the flow rate of the raw water WO can be maintained well, an increase in driving energy for flowing the raw water WO is prevented, and the treated water quality can be easily maintained at a predetermined value.

[0043] The first control unit 22A may output an alarm indicating that the individual tubular members 24 used to treat the raw water W0 should be changed when the pressure detection unit 36 detects a value equal to or greater than a predetermined value, even if the inflow rate of the raw water W0 has not increased or the number of individual tubular members 24 used has not been changed. In other words, this is the case when it is determined that solid matter may have accumulated in the individual tubular members 24 being used. In this case, maintenance of the individual tubular members 24 (piping-type agitation granulation unit 10) is required. Based on this alarm, the manager of the pipe-type agitation granulation unit 10 (piping-type agitation granulation solid-liquid separation apparatus 100) can easily plan a maintenance plan for the pipe-type agitation granulation unit 10, thereby facilitating management of the pipe-type agitation granulation unit 10 (piping-type agitation granulation solid-liquid separation apparatus 100). Furthermore, if the piping-type agitation granulation unit 10 is equipped with an automatic cleaning function using, for example, a solvent, the control unit 22 may be configured to perform automatic cleaning based on the above-mentioned alarm when the piping-type agitation granulation unit 10 (piping-type agitation granulation solid-liquid separation apparatus 100) is stopped, etc.

[0044] 11 is a front view showing pattern M in which the open state of the ends of the individual tubular members 24 of each agitation module 14 is changed by the operation of the first shutter member 20A to the fourth shutter member 20D included in the piping-type agitation granulation unit 10. Specifically, the number and positions of the individual tubular members 24 used in the first agitation module 14A, the second agitation module 14B, and the third agitation module 14C are changed.

[0045] In FIG. 11, the state shown in the first row (top row) is the state of the first piping-type agitation granulation unit 10A (first agitation module 14A) viewed from the upstream side, with six rows of individual tubular members 24 in the upper region blocked by the first shutter member 20A. Also, four columns of individual tubular members 24 in the right-hand region are blocked by the second shutter member 20B. The state shown in the second row is the state of the second piping-type agitation granulation unit 10B (second agitation module 14B) viewed from the upstream side, with four columns of individual tubular members 24 in the right-hand region blocked by the second shutter member 20B. Also, two rows of individual tubular members 24 in the upper region are blocked by the third shutter member 20C. In the state shown in the third diagram, the third piping type agitation granulation unit 10C (third agitation module 14C) is viewed from the upstream side, with two rows of individual tubular members 24 in the upper region blocked by the third shutter member 20C. Also, six rows of individual tubular members 24 in the right-hand region are blocked by the fourth shutter member 20D. And in the state shown in the fourth diagram, the third piping type agitation granulation unit 10C (third agitation module 14C) is viewed from the downstream side, with six rows of individual tubular members 24 in the right-hand region blocked by the fourth shutter member 20D.

[0046] That is, as shown in the first row, the first agitation module 14A allows the flow of raw water W0 through nine individual tubular members 24 in the lower left region. As shown in the second row, the second agitation module 14B allows the flow of raw water W0 through 25 individual tubular members 24 in the left region. And, as shown in the third and fourth rows, the third agitation module 14C allows the flow of raw water W0 through 11 individual tubular members 24 in the left region. In this case, the raw water W0, which has been agitated with the pH adjuster and first flocculant and flowed out from the lower left region of the first agitation module 14A, moves inside the second gate valve 30B located between the first agitation module 14A and the second agitation module 14B, and is allowed to flow (flow) into the 25 individual tubular members 24 in the left region where flow is allowed in the second agitation module 14B. Similarly, raw water W0, which has been agitated with the pH adjuster, first flocculant, and second flocculant, flows from the left region of the second agitation module 14B through the third gate valve 30C located between the second agitation module 14B and the third agitation module 14C. The raw water W0 then flows through the eleven individual tubular members 24 on the left side of the third agitation module 14C, allowing flow. In this case, the number of individual tubular members 24 through which raw water W0 is allowed to flow differs between the first agitation module 14A, the second agitation module 14B, and the third agitation module 14C. This allows for the agitation state to be adjusted in each agitation module 14. For example, the second agitation module 14B can slow the flow rate of raw water W0 compared to the first agitation module 14A, providing gentle agitation. The third agitation module 14C can then increase the flow rate of raw water W0 again, providing more intense agitation. This allows for the agitation mode to be adjusted depending on the type and amount of chemicals being added.

[0047] 9 and 10, the positions of the individual tubular members 24 used can be easily changed, and therefore, the path can be easily changed even if solids accumulate inside an individual tubular member 24. As described above, by moving the first gate valve 30A and the third gate valve 30C to the same position and moving the second gate valve 30B and the fourth gate valve 30D to the same position, the raw water W0 can be caused to flow using the same number of individual tubular members 24 in the same positions in the first agitation module 14A, the second agitation module 14B, and the third agitation module 14C.

[0048] FIG. 12 is a front view, viewed from the downstream side, showing variations in the movement direction of the first shutter member 20F included in the first piping-type agitation granulation unit 10A. In FIG. 12, the first shutter member 20F supported by the first gate valve 30A (not shown) located upstream of the first agitation module 14A has a substantially rectangular plate shape like the other shutter members 20, but its movement direction is shifted approximately 45° counterclockwise, allowing it to move in the F1 and F2 directions. The second shutter member 20B supported by the second gate valve 30B downstream of the first agitation module 14A can move in the Z1 and Z2 directions, as in the example of FIG. 3. As a result, as shown in FIG. 12, the positional variations of the available individual tubular members 24 can be increased depending on the movement amount of the first shutter member 20F and the second shutter member 20B.

[0049] FIG. 13 is a front view from the upstream side showing variations in the shapes and movement directions of the first shutter members 20Ga-20Gc supported by the first piping-type agitation granulation unit 10A. In FIG. 13, three substantially pentagonal plate-like first shutter members 20Ga-20Gc are arranged upstream of the first agitation module 14A. The first shutter member 20Ga is movable in the Y1-Y2 direction, similar to the first shutter member 20A shown in FIG. 2. The first shutter member 20Gb is tilted clockwise by approximately 135° relative to the first shutter member 20Ga and is movable in the G1 and G2 directions. Similarly, the first shutter member 20Gc is tilted counterclockwise by approximately 135° relative to the first shutter member 20Ga and is movable in the H1 and H2 directions. Therefore, when the first shutter members 20Ga to 20Gc are each moved by the same amount toward the center of the first agitation module 14A, the respective apexes come together near the center of the first agitation module 14A, and it is possible to block all of the individual tubular members 24. Furthermore, when the first shutter members 20Ga to 20Gc are moved in the outer or inner radial direction, it becomes possible to block the individual tubular members 24 in an irregular manner, as shown in Fig. 13, and it is possible to increase the variety of positions of the individual tubular members 24 that can be used depending on the amount of movement of the first shutter members 20Ga to 20Gc.

[0050] 12 and 13, it is possible to easily increase the variety of positions of the individual tubular members 24 that can be used for the flow of raw water W0 by changing the movement direction and shape of the shutter member 20. In this case, particularly as described above, when solids accumulate inside the individual tubular members 24 due to long-term use of the piping-type agitation granulation unit 10 (piping-type agitation granulation solid-liquid separation apparatus 100) and the raw water W0 can no longer flow smoothly, it becomes easier to select an individual tubular member 24 to use instead of that individual tubular member 24, and it becomes easier to avoid a decrease in the operating efficiency of the piping-type agitation granulation solid-liquid separation apparatus 100.

[0051] The shape of the shutter member 20 and the number of shutter members 20 arranged in one gate valve 30 are not limited to the above example, and can be changed as appropriate as long as the shape and number allow for the blocking and opening of all individual tubular members 24 of the mixing module 14, and the same effect can be obtained.

[0052] In the example described above, the shutter member 20 on the outlet side of the upstream agitation module 14 is also used as the shutter member 20 on the inlet side of the adjacent downstream agitation module 14. In other embodiments, dedicated shutter members 20 may be provided on the inlet and outlet sides of the agitation module 14. In other words, the gate valve 30 sandwiched between adjacent agitation modules 14 may be provided with a shutter member 20 on the outlet side of the upstream agitation module 14 and a shutter member 20 on the inlet side of the downstream agitation module 14. In this case, too, the individual tubular members 24 can be selected in the same way as in the case where the shutter member 20 is shared between the outlet and inlet sides as described above, and similar effects can be obtained.

[0053] Although the embodiments of the present invention have been described above, the above embodiments are merely examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in various forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. The above embodiments are included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as set forth in the claims. [Explanation of symbols]

[0054] 10. Pipe-type agitation granulation unit 10A First piping type agitation granulation unit 10B Second piping type agitation granulation unit 10C Third piping type agitation granulation unit 12 Solid-liquid separation unit 14 Mixing Module 14A First mixing module 14B Second mixing module 14C Third mixing module 16 Coagulant addition section 16A First flocculant addition section 16B Second flocculant addition section 16C Third flocculant addition section 18 pH adjuster addition section 20 Shutter parts 20A, 20F, 20Ga, 20Gb, 20Gc First shutter member 20B Second shutter member 20C Third shutter member 20D Fourth shutter member 22 Control Unit 22A First control section 22B 2nd control section 24 Individual tubular members 24a Flow path 26 Elements 28 Housing 30 Gate valve 30A First Gate Valve 30B Second gate valve 30C Third gate valve 30D 4th gate valve 34 Flow rate detection unit 36 Pressure detection unit 46 First water quality detection unit 48 Second water quality detection unit 100 Pipe-type agitation granulation solid-liquid separation equipment

Claims

1. an agitation module in which a plurality of individual tubular members, each having a spiral element fixed thereto, are arranged in parallel in a flow path through which raw water to be treated can flow, and the raw water flowing through each of the individual tubular members is agitated; an adding unit that is disposed upstream of the agitation module and that adds a chemical to form flocs to the raw water flowing through the individual tubular members; a plate-shaped shutter member disposed at at least one of the upstream end and the downstream end of the mixing module, the shutter member being movable between a fully closed position at which all of the flow paths of the plurality of individual tubular members are closed and an open position at which at least one of the flow paths of the plurality of individual tubular members is opened; a control unit that controls the movement position of the shutter member to determine the individual tubular member to be used for treating the raw water; A piping type agitation granulation unit equipped with:

2. The shutter members are provided at the upstream end and the downstream end of the mixing module, 2. The piping-type agitation granulation unit according to claim 1, wherein the control unit differentiates a first open position of the shutter member on the upstream end side from a second open position of the shutter member on the downstream end side, and determines the position of the individual tubular member used for treating the raw water by combining the first open position and the second open position.

3. The pipe-type agitation granulation unit according to claim 1 or 2, wherein a plurality of the shutter members are arranged at the end of the agitation module.

4. The control unit controls the opening position of the shutter member based on the state of the treated fluid that has been discharged from the pipe-type agitation granulation unit and subjected to post-treatment, and determines the number of the individual tubular members to be used for treating the raw water. A pipe-type agitation granulation unit according to any one of claims 1 to 3.

5. The control unit controls the opening position of the shutter member based on the processing volume of the raw water flowing into the pipe-type agitation granulation unit, and determines the number of the individual tubular members to be used for processing the raw water. The pipe-type agitation granulation unit according to any one of claims 1 to 4.

6. a pressure detection unit provided upstream of the agitation module for detecting a pressure state of the raw water flowing into the agitation module; The control unit controls the opening position of the shutter member based on the pressure state when the raw water passes through the agitation module, and determines the position of the individual tubular member used to treat the raw water. A piping-type agitation granulation unit according to any one of claims 1 to 5.

7. The piping-type agitation granulation unit according to claim 6, wherein the control unit outputs an alarm indicating that the individual tubular member used for treating the raw water should be changed when the detection value detected by the pressure detection unit is equal to or greater than a predetermined value.

8. The pipe-type agitation granulation unit according to any one of claims 1 to 7, wherein the control unit adjusts at least one of the amount and type of the chemical to be added in the addition unit based on the state of the treated fluid that has been discharged from the pipe-type agitation granulation unit and subjected to post-treatment.

9. A pipe-type agitation granulation solid-liquid separation device comprising a solid-liquid separation unit that performs post-processing of the agitated fluid discharged from the pipe-type agitation granulation unit described in any one of claims 1 to 8, downstream of the pipe-type agitation granulation unit.

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