WO2021181633A1 - 高分子凝集剤混合溶解システム - Google Patents
高分子凝集剤混合溶解システム Download PDFInfo
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- WO2021181633A1 WO2021181633A1 PCT/JP2020/010934 JP2020010934W WO2021181633A1 WO 2021181633 A1 WO2021181633 A1 WO 2021181633A1 JP 2020010934 W JP2020010934 W JP 2020010934W WO 2021181633 A1 WO2021181633 A1 WO 2021181633A1
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- Prior art keywords
- polymer flocculant
- aqueous solution
- mixing
- flow path
- flow rate
- Prior art date
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- 229920000642 polymer Polymers 0.000 title claims abstract description 93
- 239000007864 aqueous solution Substances 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 27
- 238000011143 downstream manufacturing Methods 0.000 claims abstract description 24
- 239000002904 solvent Substances 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 9
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 58
- 239000008394 flocculating agent Substances 0.000 claims description 9
- 239000000243 solution Substances 0.000 abstract description 14
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000010802 sludge Substances 0.000 description 17
- 238000004090 dissolution Methods 0.000 description 14
- 239000000701 coagulant Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 229920006317 cationic polymer Polymers 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 208000005156 Dehydration Diseases 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 description 1
- DPBJAVGHACCNRL-UHFFFAOYSA-N 2-(dimethylamino)ethyl prop-2-enoate Chemical compound CN(C)CCOC(=O)C=C DPBJAVGHACCNRL-UHFFFAOYSA-N 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001409 amidines Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229920006318 anionic polymer Polymers 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F21/00—Dissolving
- B01F21/30—Workflow diagrams or layout of plants, e.g. flow charts; Details of workflow diagrams or layout of plants, e.g. controlling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/28—Mechanical auxiliary equipment for acceleration of sedimentation, e.g. by vibrators or the like
- B01D21/286—Means for gentle agitation for enhancing flocculation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F21/00—Dissolving
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F21/00—Dissolving
- B01F21/20—Dissolving using flow mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F21/00—Dissolving
- B01F21/40—Dissolving characterised by the state of the material being dissolved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/10—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
- B01F25/51—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is circulated through a set of tubes, e.g. with gradual introduction of a component into the circulating flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
- B01F25/52—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle with a rotary stirrer in the recirculation tube
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/60—Pump mixers, i.e. mixing within a pump
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
- B01F35/2211—Amount of delivered fluid during a period
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
- B01F35/2213—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D3/00—Differential sedimentation
- B03D3/06—Flocculation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/305—Treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5227—Processes for facilitating the dissolution of solid flocculants in water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
Definitions
- the present invention relates to a polymer flocculant mixing and dissolving system, and more particularly to a technique for dissolving a solid polymer flocculant in water as a solvent.
- sludge concentration treatment and dehydration treatment are performed. At that time, in order to improve the sludge concentration efficiency and the dewatering efficiency, a coagulant is added to coagulate the sludge. Further, in the field of water treatment, a coagulation sedimentation treatment of a suspension is performed. Also at that time, in order to improve the coagulation-sedimentation efficiency, a coagulant is added to the water to be treated to coagulate the suspension.
- various flocculants such as inorganic flocculants and cationic and anionic polymer flocculants are selectively used.
- the solid polymer flocculant has a disadvantage that it is difficult to dissolve in a liquid, while a high flocculation effect can be obtained by crosslink aggregation. Therefore, the solid polymer flocculant is not directly added to sludge or the like, but is dissolved in water in advance to form an aqueous solution, and then added to sludge or the like so as to have a predetermined chemical injection rate.
- the polymer flocculant has another problem that it deteriorates and the coagulation effect decreases after a long time has passed since it was made into an aqueous solution, it is not possible to prepare a large amount of the aqueous solution in advance and store it in a tank or the like. Not preferable.
- the present inventor has embodied and implemented a polymer coagulant mixed dissolution system capable of producing a polymer coagulant solution in a short time and with low power (see Patent Document 1). We are considering further improvements.
- the polymer coagulant mixed dissolution system reported in Patent Document 1 has made it possible to generate a solution of a polymer coagulant in a short time and with low power, but the flow rate of the solution sent to a downstream process. It is necessary to adjust the liquid feed pump as a liquid feed means, and at that time, if the rotation rate of the vortex mixer is not properly controlled, there is a concern that excessive negative pressure may be generated and the liquid feed pump may be damaged. Therefore, it was necessary to change the rotation speed of the vortex mixer every time the flow rate of the solution sent to the downstream process was changed. In this case, for example, in the case of a system that is automatically controlled, it is necessary to install a control device (for example, an inverter), and in the case of a system that is manually controlled, for example, the burden on the operator becomes large.
- a control device for example, an inverter
- the present invention has been made to solve the above-mentioned problems mentioned as an example, and an object thereof is polymer aggregation capable of stably supplying an amount of a solution required by a downstream process.
- the purpose is to provide a drug mixing and dissolving system.
- a mixing tank in which a solid polymer coagulant is mixed with water as a solvent and an aqueous solution containing the polymer coagulant are mixed from the mixing tank.
- a liquid feeding means for feeding liquid and an aqueous solution containing the polymer flocculant sent from the liquid feeding means are pressurized while forming a vortex flow to mix and dissolve the polymer flocculant.
- the circulation flow path that returns the aqueous solution to a position upstream of the liquid feeding means, and the process flow path and the circulation flow path.
- a flow rate adjusting means for adjusting the flow rate of the aqueous solution.
- a general vortex pump is used for the purpose of obtaining the action / effect of the present invention when it is used for the purpose of dissolving the swollen undissolved polymer flocculant. Therefore, it is interpreted that it is included in the vortex mixer.
- the vortex pump is sometimes called a cascade pump.
- the circulation flow path returns the aqueous solution to the suction side of the liquid feeding means and / or to the mixing tank.
- a flow rate adjusting control unit that executes automatic control of the flow rate adjusting means may be further provided based on the information on the flow rate of the aqueous solution required in the downstream process.
- a pressure adjusting means for controlling the pressure on the discharge side of the vortex mixer is further provided in the flow path between the vortex mixer and the flow rate adjusting means. (5) It is preferable that the liquid feeding means and the vortex mixer are set to constant and high load operating conditions.
- a solid polymer flocculant is mixed with water as a solvent, and an aqueous solution containing the polymer flocculant obtained by the mixing is fed into a vortex mixer by a liquid feeding means.
- a vortex flow mixer pressure is applied to mix and dissolve while forming a vortex flow.
- a process flow path for sending the aqueous solution to the downstream process and a circulation flow path for returning the aqueous solution to a position upstream of the liquid feeding means are provided, and the flow rate of the aqueous solution flowing through the process flow path and the circulation flow path is adjusted by the flow rate adjusting means.
- the liquid feeding means and the eddy current mixer can be operated stably.
- the amount of the solution required by the downstream process can be stably supplied.
- the control device for example, an inverter
- the control device that automatically controls the load of the liquid feeding means and the vortex mixer, it is possible to contribute to cost reduction, and there is less need for manual control, so the burden on the operator is reduced. There are few.
- FIG. 1 is a schematic view showing the overall configuration of a polymer flocculant mixed / dissolved system (hereinafter referred to as “mixed / dissolved system”) according to the present embodiment.
- the mixing / dissolving system 1 includes a mixing tank 2 for mixing a solid polymer flocculant with water as a solvent.
- the mixing tank 2 is a closed or open tank capable of storing water as a solvent. Water, which is a solvent, is supplied into the tank through a flow path such as a pipe connected to the upper part of the tank.
- the mixing tank 2 can further be provided with a stirring means for stirring the water in the tank and dispersing the polymer flocculant.
- a stirring machine 21 for rotating the stirring blades arranged in the tank with a drive motor can be used.
- a known stirring means other than the stirring machine may be adopted.
- the volume of the mixing tank 2 can be appropriately designed according to the amount of the aqueous solution to be prepared.
- the mixing time that is, the residence time
- the volume can be designed to be suitable for operation.
- the reason for setting this mixing time is to secure the time required to swell the polymer flocculant to the extent that it can be dissolved in the subsequent step. If the mixing time is too short, the polymer flocculant may not swell sufficiently and may not be sufficiently dissolved even in the subsequent steps. On the other hand, if it is too long, it goes against the purpose of obtaining a fresh aqueous solution. In addition, there is a drawback that the mixing tank 2 becomes large.
- Water as a solvent can be continuously supplied into the tank.
- the continuous supply system also has an advantage that the mixing tank 2 can be miniaturized.
- a batch method may be used in which a certain amount of water is filled in the tank, a polymer flocculant is added, and then the filled amount of water (aqueous solution) is extracted.
- a powdery or granular solid polymer flocculant is quantitatively added to the mixing tank 2 using, for example, a hopper 22 arranged above the mixing tank 2.
- the hopper 22 has a main body formed in a cone shape, and has a configuration in which a polymer flocculant is stored inside, and the polymer flocculant is quantitatively cut out from the bottom and added to the mixing tank 2. There is.
- the hopper 22 may be sealed so that the polymer flocculant does not absorb moisture during storage, and further moisture-proof measures such as blowing a dry gas may be taken.
- a discharge means 22a for quantitatively cutting out the polymer flocculant from the hopper is arranged.
- a screw conveyor type quantitative feeder can be used as an example of the discharging means 22a.
- the hopper 22 is a preferable example of a means for quantitatively adding the polymer flocculant to the mixing tank 2, and other adding means may be adopted, or the operator may manually add the polymer flocculant. May be good.
- a liquid feeding pump 3 is connected to the mixing tank 2 as an example of the liquid feeding means.
- the liquid feed pump 3 continuously draws out the aqueous solution in the tank and feeds the liquid to the mixing / dissolving step in the subsequent stage.
- the aqueous solution extracted from the mixing tank 2 contains an already dissolved polymer flocculant and a swollen undissolved polymer flocculant. Since the aqueous solution has a higher viscosity due to the dissolution of the polymer flocculant, it is configured to be fed to the mixing / dissolving step in the subsequent stage by using the liquid feeding pump 3.
- the type of the liquid feed pump 3 is not particularly limited. And it does not have to have any quantitativeness. Further, it is not necessary to provide a device such as an inverter that variably controls the flow rate of the pump.
- a liquid feeding means other than the pump may be adopted.
- the first vortex mixer 4A is connected to the flow path such as the pipe connected to the discharge side of the liquid feed pump 3, and then the second vortex mixer 4B is connected. That is, the first vortex mixer 4A and the second vortex mixer 4B for mixing and dissolving the polymer flocculant are arranged in series in two stages. Valves V (V1, V2, V3) and pressure gauges are in the middle of the flow path from the liquid feed pump 3 to the first vortex mixer 4A and in the middle of the flow path from the first vortex mixer 4A to the second vortex mixer 4B. P (P1, P2, P3) and the like may be provided. Since the suction side of the first vortex mixer may have a negative pressure, a compound meter can be used as an example of the pressure gauge P1. In order to enable the operation of the first vortex mixer 4A alone, a bypass flow path for sending downstream without passing through the second vortex mixer 4B may be provided.
- vortex mixers having different processing capacities may be arranged, but it is preferable to use vortex mixers having the same structure and the same processing capacity.
- a preferable example of the configuration of the vortex mixers 4A and 4B will be described in detail.
- a casing 41 having an aqueous solution suction port 41a and a discharge port 41b, an impeller 42 corresponding to an impeller in a pump, and a drive motor 43 as a drive mechanism for rotating the impeller 42. It has.
- the drive motor 43 is shown in a block diagram.
- the casing 41 communicates with each of the suction port 41a and the discharge port 41b of the aqueous solution, and has an internal region 41c that rotatably accommodates the impeller 42.
- the internal region 41c has an inner peripheral surface 41d that faces the outer peripheral edge of the impeller 42 in a non-contact manner through a gap.
- the aqueous solution sucked into the casing 41 from the suction port 41a is transferred while being pressurized in the casing internal region 41c by the rotating impeller 42, and is discharged from the discharge port 41b.
- the discharge port 41b is formed with a buffer region 44 having an expanded volume.
- the suction port 41a is provided with an injection port 41e for injecting so-called "priming water” into the casing 41 at the time of start-up.
- the impeller 42 is formed in a substantially disk shape, and is arranged in the internal region 41c of the casing 41 so as to be rotatable around a line extending in a direction perpendicular to the center of the circle (vertical direction with respect to the paper surface) as a rotation axis. Has been done.
- a large number of grooves 45 for forming a fine vortex flow along the inner peripheral surface 41d of the casing 41 are radially formed on the outer peripheral edge of the impeller 42.
- a large number of radial grooves 45 are formed on the outer peripheral edge of the impeller 42 over the entire circumference.
- a rotating shaft 46 is connected to the impeller 42 along the rotating shaft.
- the rotary shaft 46 penetrates the casing 41 and is connected to a drive motor 43 arranged outside, and the impeller 42 is configured to rotate when the drive motor 43 is driven.
- the portion penetrating the casing 41 can be sealed by a sealing mechanism (not shown) such as a mechanical seal.
- the pressure on the discharge side of the second vortex mixer 4B becomes a predetermined pressure as a preferable example in the flow path such as the pipe connected to the discharge side of the second vortex mixer 4B.
- a pressure adjusting means for controlling the pressure is provided.
- the pressure adjusting valve 5 that adjusts the pressure according to the valve opening, the pressure sensor 51, and the pressure adjusting valve 5 so that the detected value of the pressure sensor 51 becomes a predetermined pressure.
- a combination of pressure control units 52 that control the opening degree of the above can be used.
- the pressure adjusting means may be configured to be manually controlled. As an example, the operator adjusts the opening degree of the pressure adjusting valve 5 so that the detected value of the pressure sensor 51 or an alternative pressure gauge becomes a predetermined pressure.
- a predetermined pressure value can be used as the predetermined pressure, which is determined in advance according to the type of the polymer flocculant. That is, the dissolution of the polymer flocculant is a pressure suitable for dissolving the polymer flocculant, focusing on the characteristic that when the pressure is high, the permeation into the solvent is promoted and the polymer is easily dissolved, and the degree of pressure differs depending on the type. Adopt a configuration that controls pressurization up to. Therefore, it is preferable to have the information of the pressure set value determined in advance in association with the type of the polymer flocculant, or to store it in the memory of the computer of the pressure control unit 52 or the like.
- the pressure set value may be determined based on, for example, the components of the polymer flocculant, the molecular weight, or the like, or may be determined by actually performing a test. Then, the operator sets the pressure set value of the pressure control unit 52 according to the type of the polymer flocculant, or the pressure control unit 52 reads the information from the memory or the like and sets the pressure set value.
- the aqueous solution (that is, the polymer coagulant solution) is sent to the downstream process through the process flow path 61.
- the sludge treatment step it may be added to the sludge as it is, or it may be added to the sludge after passing through a buffer tank or the like once.
- the water treatment step it can be added to the water to be treated.
- sludge to which a polymer flocculant solution is added so as to have a predetermined chemical injection rate is supplied to, for example, a decanter type centrifugal concentrator or centrifugal dehydrator to perform solid-liquid separation for concentration and dehydration. do.
- the water to be treated to which the polymer flocculant solution is added so as to have a predetermined chemical injection rate is supplied to a settling tank, a filter or the like to perform solid-liquid separation.
- the polymer flocculant solution prepared by the mixed dissolution system 1 of the present embodiment is not limited to the type of the solid-liquid separation device, and can be used in a known solid-liquid separation device.
- the vortex mixers 4A and 4B having the configuration shown in FIG. 2 are shown as a preferred embodiment, but a general vortex pump may be used as an alternative.
- the vortex pump may also be referred to as a cascade pump.
- the type of the polymer flocculant applied to the mixed dissolution system 1 of the present embodiment is not particularly limited, and can be appropriately selected depending on the type and composition of sludge to be treated, water to be treated, and the like. ..
- cationic polymer flocculants are the mainstream, but anionic or amphoteric polymer flocculants may also be used.
- a methacrylic acid ester or an acrylic acid ester can be used. More specifically, dimethylaminoethyl methacrylate or dimethylaminoethyl acrylate can be used.
- a cross-linking or amidine-based polymer flocculant can also be used. The molecular weight of these polymer flocculants is 1.5 to 16 million.
- the liquid feed pump 3, the first vortex mixer 4A and the second vortex mixer 4B are started, respectively, and the set value of the control pressure by the pressure control unit 52 is determined / changed.
- the pressure set value is set to 0.3 MPa.
- the polymer flocculant mixed with water dissolves in water in the mixing tank 2, but part of it remains undissolved. However, in the mixing tank 2, the mixing time with water is secured for about 10 minutes, so that the mixing tank 2 is in a swollen state.
- the aqueous solution whose viscosity has increased due to the dissolution of the polymer flocculant is sent to the first vortex mixer 4A in a state of containing the undissolved polymer flocculant by the liquid feed pump 3.
- the flow rate of the aqueous solution is, for example, 25 L / min.
- each of the liquid feed pump 3, the first vortex mixer 4A, and the second vortex mixer 4B is set under constant and high-load operating conditions on the premise that the pressure set value can be secured, for example.
- the liquid feed pump 3, the first eddy current mixer 4A and the second eddy current mixer 4B each have a high load operating condition (for example, 70% or more of the maximum capacity, preferably 100) within the range of the specifications. %), And in principle, this condition should be continued during normal operation. Constant operation is performed by rotating each drive motor at a fixed speed. In this way, the liquid feed pump 3, the first vortex mixer 4A, and the second vortex mixer 4B are operated (mixed and dissolved) in a high load operation within the range of the specifications without changing the rotation speed during the normal operation. To.
- the aqueous solution sent to the first vortex mixer 4A by the liquid feed pump 3 repeatedly forms a fine vortex flow along the inner peripheral surface 41d of the casing 41 by the rotating impeller 42, and is pressurized by this.
- the aqueous solution that was ⁇ 0.05 MPa near the suction port is pressurized to 0.12 MPa near the discharge port.
- the polymer flocculant is sufficiently mixed and dissolved in water.
- the viscosity of the aqueous solution also increases as the dissolution progresses.
- the impeller 42 rotates in a non-contact manner with respect to other parts, the action of mechanically crushing the polymer flocculant and the shear stress are hardly exhibited.
- the fine vortex flow repeatedly formed through the fine grooves 45 formed radially and the pressurizing action thereof promote the mixed dissolution of the polymer flocculant.
- the aqueous solution that has passed through the first vortex mixer 4A repeatedly forms a fine vortex flow along the inner peripheral surface 41d of the casing 41 by the rotating impeller 42 in the subsequent second vortex mixer 4B, and is pressurized by this. go.
- the aqueous solution that was 0.12 MPa near the suction port is pressurized to the target pressure of 0.3 MPa near the discharge port. That is, the vortex mixers 4A and 4B having a two-stage structure in series sequentially pressurize the polymer to a pressure suitable for dissolving the polymer flocculant.
- the mixed dissolution of the polymer flocculant is promoted by the fine vortex flow repeatedly formed through the fine grooves 45 formed radially and the pressurizing action thereof.
- the pressure is pressurizing the pressure to a pressure suitable for dissolving the polymer flocculant, the polymer flocculant is sufficiently dissolved.
- the aqueous solution generated through the first vortex mixer 4A and the second vortex mixer 4B is divided into the main flow and the circulating flow of the process by adjusting the opening degree of the three-way valve 6. That is, the flow rate required in the downstream process is sent to the downstream process through the process flow path 61, and the rest is returned to the suction side of the liquid feed pump 3 through the circulation flow path 62.
- the flow rate required in the downstream process changes, for example, the operator manually adjusts the opening degree of the three-way valve 6 so that the required flow rate of the aqueous solution is sent to the downstream process through the process flow path 61.
- the flow rate required in the downstream process changes, for example, in the case of sludge treatment, by changing the properties of the sludge and changing the appropriate chemical injection rate.
- the specifications of each device are determined so that a flow rate of 0 to 100% can be circulated with respect to the flow rate (for example, the maximum flow rate) required in the downstream process.
- the first vortex mixer 4A and the second vortex mixer 4B in which an aqueous solution containing an undissolved polymer flocculant that could not be dissolved in the mixing tank 2 is arranged in series. Water is passed through. Then, the vortex mixers 4A and 4B pressurize while forming a fine vortex flow. As a result, the mixed dissolution of the polymer flocculant can be promoted, and the swollen undissolved polymer flocculant can be dissolved. It should be noted that a plurality of vortex mixers do not necessarily have to be provided.
- the flow rate adjusting means capable of variably adjusting the flow rate of the aqueous solution between the process flow path 61 and the circulation flow path 62, the liquid feed pump 3 and the first vortex mixer 4A And the aqueous solution of the flow rate required in the downstream process can be variably sent without changing the operating state (particularly the number of revolutions) of the second vortex mixer 4B. Furthermore, the remaining aqueous solution is returned in the circulation flow path, and the aqueous solution is repeatedly circulated in the "mixing and dissolving section" from the liquid feeding pump 3 ⁇ the vortex mixer ⁇ the pressure adjusting means, so that the liquid quality of the aqueous solution is returned in the mixing and dissolving section.
- the solubility can be improved.
- a device for example, an inverter
- the cost can be reduced, and the need for manual control is small, so that the burden on the operator is small.
- the flow rates sent to the downstream process were 12.5 (L / min) and 16.7 (L / min).
- the mesh transmittance at the time of setting was 96.1% and 95.5%, respectively.
- the mesh transmittance when the flow rates sent to the downstream process are set to 12.5 (L / min) and 16.7 (L / min) is They were 94.0% and 92.4%, respectively. That is, it has been confirmed that the solubility is improved.
- a three-way valve 6 is used as a preferable example of the flow rate adjusting means, but the present invention is not limited to this as long as the flow rate can be adjusted between the process flow path 61 and the circulation flow path 62.
- valves may be provided in the process flow path 61 and the circulation flow path 62, respectively, to adjust the opening degree of each valve.
- a valve may be provided only in either the process flow path 61 or the circulation flow path 62.
- the pressure adjusting valve 5 as the pressure adjusting means is omitted, and for example, the discharge pressure of the second vortex mixer 4B is adjusted by the valves provided in the process flow path 61 and the circulation flow path 62 instead of the three-way valve 6. It may be. That is, while adjusting the opening degree of the valve provided in the process flow path 61 and the circulation flow path 62 so that the detected value of the pressure sensor 51 becomes a predetermined pressure, between the process flow path 61 and the circulation flow path 62. It also adjusts the flow rate. In this way, the flow rate adjusting means may also serve as the pressure adjusting means.
- each of the liquid feed pump 3, the first vortex mixer 4A, and the second vortex mixer 4B is set to constant and high-load operating conditions, so that it is necessary if pressure fluctuation is unlikely to occur. If so, for example, a resistance member such as an orifice may be provided and the pressure adjusting means itself may be omitted.
- the configuration is such that the aqueous solution is returned to the suction side of the liquid feed pump 3 so that the aqueous solution can be surely returned to the vortex mixers 4A and 4B, but the present invention is not limited to this, for example.
- it may be returned to the mixing tank 2 so that the swelling is promoted.
- the circulation flow path 62 may be branched in the middle and returned to both the suction side of the liquid feed pump 3 and the mixing tank 2.
- a three-way valve 63 may be provided at the branch point to adjust the return flow rate between the suction side of the liquid feed pump 3 and the mixing tank 2.
- the ratio of returning to the front of the liquid feed pump 3 is increased, and when it is desired to promote swelling, the ratio of returning to the mixing tank 2 is increased.
- the mixing / dissolving system according to the present embodiment is the same as the mixing / dissolving system 1 of the first embodiment except that a control unit for automatically controlling the flow rate adjusting means is provided. Therefore, detailed description will be omitted by assigning the same reference numerals to the same configurations.
- the polymer coagulant mixing / dissolving system 1 includes a flow rate sensor 71 that detects the flow rate of the aqueous solution flowing through the process flow path 61, and a flow rate adjustment control unit 7 that is a control unit. There is.
- the flow rate adjustment control unit 7 adjusts the opening degree of the three-way valve 6 so that the detected value of the flow rate sensor 71 becomes the flow rate set value based on the flow rate information (flow rate set value) of the aqueous solution required in the downstream process. Control automatically.
- the flow rate set value information may be configured to be automatically received from a device in a downstream process, or may be input by an operator.
- the circulation flow path 62 may be returned to the mixing tank 2, or as shown in FIG. 7, the circulation flow path 62 is branched in the middle. It may be returned to both the suction side of the liquid feed pump 3 and the mixing tank 2.
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Abstract
Description
ここで、一般の渦流(かりゅう)ポンプであっても、膨潤した未溶解の高分子凝集剤を溶解する目的で使用されている場合は、本発明の作用・効果を得る目的で使用されているので、前記渦流ミキサーに含まれると解釈される。なお、渦流(かりゅう)ポンプは、カスケードポンプと称されることもある。
(2)好ましくは、前記循環流路は、前記送液手段の吸入側、及び/又は、前記混合槽に前記水溶液を戻すようにする。
(3)前記下流の工程で必要とされる前記水溶液の流量の情報に基づいて前記流量調節手段の自動制御を実行する流量調節制御部をさらに設けるようにしてもよい。
(4)前記渦流ミキサーと前記流量調節手段の間の流路に、前記渦流ミキサーの吐出側の圧力を制御する圧力調節手段をさらに設けるようにする。
(5)前記送液手段及び前記渦流ミキサーは、一定で且つ高負荷運転条件に設定されることが好ましい。
図1は、本実施形態に従う高分子凝集剤混合溶解システム(以下、「混合溶解システム」と称す)の全体構成を示す概略図である。図1に示すように、混合溶解システム1は、固体状の高分子凝集剤を、溶媒である水と混合するための混合槽2を備えている。混合槽2は、溶媒である水を貯留することのできる密閉系又は開放系の槽である。溶媒である水は、例えば槽上部に接続した配管等の流路を通じて槽内に供給する。混合槽2は、槽内の水を撹拌して、高分子凝集剤を分散させるための撹拌手段をさらに備えることができる。撹拌手段の一例として、槽内に配置した撹拌羽根を駆動モータで回転させる撹拌機21を用いることができる。勿論、撹拌機以外の公知の撹拌手段を採用してもよい。
続いて、上述の混合溶解システム1を用いて、高分子凝集剤の溶解液を生成する方法について説明する。なお、以下の説明では、カチオン系の高分子凝集剤の場合を主体にして説明するが、特筆しない限り、他の高分子凝集剤でも同様の作用・効果を奏する。混合溶解システム1が起動されると、まず、溶媒である水を混合槽2に所定の流量で供給すると共に、所定の濃度の水溶液となるように高分子凝集剤を所定の流量で添加する。濃度の一例としては、0.1~0.3質量%、好ましくは0.2質量%に設定することができる。その一方で、送液ポンプ3、第1渦流ミキサー4A及び第2渦流ミキサー4Bを各々起動させると共に、圧力制御部52による制御圧力の設定値を決定/変更する。ここでは、一例として圧力設定値を0.3MPaとする。
続いて、第2実施形態に従う高分子凝集剤混合溶解システムについて説明する。本実施形態に従う混合溶解システムは、流量調節手段を自動で制御するための制御部を備えたことを除けば、第1実施形態の混合溶解システム1と同じである。よって、同じ構成については同じ符号を付すことによって、詳しい説明は省略する。
2 混合槽
3 送液ポンプ
4A 第1渦流ミキサー
4B 第2渦流ミキサー
45 溝
5 圧力調節バルブ
51 圧力センサー
52 圧力制御部
6 三方弁
61 プロセス流路
62 循環流路
7 流量調節制御部
71 流量センサー
Claims (5)
- 固体状の高分子凝集剤を、溶媒である水と混合する混合槽と、
前記高分子凝集剤を含んだ水溶液を、前記混合槽から送液する送液手段と、
前記送液手段から送られてくる前記高分子凝集剤を含んだ水溶液を、渦流れを形成しながら加圧して、該高分子凝集剤を混合溶解する渦流ミキサーと、
前記渦流ミキサーを通過した前記水溶液を、下流の工程に送るプロセス流路と、前記送液手段よりも上流位置に戻す循環流路と、前記プロセス流路と前記循環流路との間で前記水溶液の流量を調節する流量調節手段と、を備えたことを特徴とする高分子凝集剤の混合溶解システム。 - 前記循環流路は、前記送液手段の吸入側、及び/又は、前記混合槽に前記水溶液を戻すことを特徴とする請求項1に記載の高分子凝集剤の混合溶解システム。
- 前記下流の工程で必要とされる前記水溶液の流量の情報に基づいて前記流量調節手段の自動制御を実行する流量調節制御部をさらに設けたことを特徴とする請求項1又は2に記載の高分子凝集剤の混合溶解システム。
- 前記渦流ミキサーと前記流量調節手段の間の流路に、前記渦流ミキサーの吐出側の圧力を制御する圧力調節手段をさらに設けたことを特徴とする請求項1~3のいずれか1項に記載の高分子凝集剤の混合溶解システム。
- 前記送液手段及び前記渦流ミキサーは、一定で且つ高負荷運転条件に設定されることを特徴とする請求項1~4のいずれか1項に記載の高分子凝集剤の混合溶解装置。
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PCT/JP2020/010934 WO2021181633A1 (ja) | 2020-03-12 | 2020-03-12 | 高分子凝集剤混合溶解システム |
CA3171083A CA3171083A1 (en) | 2020-03-12 | 2020-03-12 | Polymer flocculant mixing and dissolving system |
EP20923894.8A EP4101516A4 (en) | 2020-03-12 | 2020-03-12 | POLYMERIC FLOCCULANT MIXING AND DISSOLUTION SYSTEM |
KR1020227026878A KR20220141796A (ko) | 2020-03-12 | 2020-03-12 | 고분자 응집제 혼합용해 시스템 |
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