JP2010023005A - Injection monitor device of flocculant - Google Patents

Abstract

By constantly monitoring the injection state of a flocculant, it is possible to quickly cope with the occurrence of a defective flocculant injection.
In step S1, turbidity of raw water before PAC injection is measured, and in step S2, turbidity of raw water after PAC injection is measured. In step S3, the difference between the measurement results is calculated. In step S4, it is determined whether or not the difference ΔS1 is larger than the predetermined reference value R1, and if the answer is negative (No), it is determined in step S5 whether or not an operation command for the air vent valve 13 was issued in the previous routine. If the answer to step S6 is negative (No), the process proceeds to step S6, an operation command is issued to the air vent valve 13, and the process returns to step S1. In the subsequent routine, if the answer to step S4 is negative (No), a warning sound is emitted in step S7, and in the subsequent step S8, the first to third drain valves 23a to 23c are controlled to open and close, and the water recovery rate is set. Drive down.
[Selection] Figure 3

Description

  The present invention relates to a flocculant injection monitoring device, and more particularly to a flocculant injection monitoring device in a filtration system that supplies raw water into which a flocculant has been injected to a tower-type filtration device.

  In a water treatment system that treats raw water such as groundwater and well water and supplies high-purity water to cooling towers and heat exchangers, the raw water contains a large amount of suspended solids and other impurities. Usually, the impurities are filtered and separated in advance by a tower type filtration device such as a sand filtration device, and the filtered water separated by filtration is treated by a membrane filtration device.

  And since the impurities contain many fine particles, conventionally, as shown in Patent Document 1, a flocculant such as polyaluminum chloride (hereinafter referred to as “PAC”) is previously injected into the raw water, Filtration is performed by a tower-type filtration device with the impurities in a floc form.

JP 2005-227461 A

  By the way, the flocculant is usually injected into the raw water from the flocculant injecting device. However, if the air enters the flocculant injecting device or the injection tube or if the coagulant is forgotten to be replenished, the flocculant injecting device is left empty. Doing so will result in poor injection.

  If the operation of the system is continued in a state where such injection failure has occurred, fine impurities may flow into the filtered water without being separated and removed by the tower-type filtration device. And when filtered water containing such impurities is supplied to the membrane filtration device, the filtration membrane of the membrane filtration device will cause fouling at an early stage, resulting in a decrease in filtration performance or system failure. There is.

  The present invention has been made in view of such circumstances, and by constantly monitoring the flocculant injection state, the flocculant injection monitoring can be promptly dealt with even if a flocculant injection failure occurs. An object is to provide an apparatus.

  In order to achieve the above object, the flocculant injection monitoring device according to the present invention supplies raw water into which the flocculant has been injected to a tower-type filtration device, and flocculates in a filtration system that filters and separates impurities contained in the raw water. An agent injection monitoring device comprising: a flocculant injection means for injecting the flocculant into the raw water; a fluctuation state detection means for detecting a fluctuation state of turbidity before and after the injection of the flocculant; and the fluctuation state detection means And an abnormality detecting means for detecting an abnormality when the fluctuation state detected by the method is equal to or less than a predetermined reference value.

  Further, in the flocculant injection monitoring device of the present invention, the fluctuation state detecting means is a turbidity detecting means for detecting the fluctuation amount of the turbidity of the raw water, and the number of particles for detecting the fluctuation amount of the number of particles in the raw water. It includes at least one of a detecting means and a chromaticity detecting means for detecting a variation in chromaticity of the raw water.

  Further, the flocculant injection monitoring device of the present invention is the filtration water filtered by the tower filtration device is supplied to the membrane filtration device and separated into permeated water and concentrated water, and the membrane filtration device is The water recovery rate control means for controlling the water recovery rate based on at least one of the raw water temperature and the water quality, and the abnormality detecting means detects the water recovery rate when the abnormality is detected. It is characterized by having means for reducing the water recovery rate.

  The flocculant injection monitoring apparatus of the present invention includes an air vent valve for removing air that has entered the flocculant injection system including the flocculant injection means, and the abnormality detection means detects the abnormality. Has an operation command means for issuing an operation command to the air vent valve.

  Furthermore, the flocculant injection monitoring apparatus of the present invention is characterized in that the abnormality detection means has an alarm means for emitting an alarm sound when the abnormality is detected.

  The flocculant injection monitoring device of the present invention is characterized in that the tower type filtration device includes at least one of a sand filtration device and an iron removal / manganese removal filtration device.

  The flocculant injection monitoring device of the present invention is characterized in that the membrane filtration device includes at least one of a reverse osmosis membrane device and a nanofiltration membrane device.

  According to the flocculant injection monitoring device of the present invention, the raw water into which the flocculant has been injected is supplied to a tower-type filtration device (sand filtration device, iron removal / manganese filtration device), and impurities contained in the raw water are removed. A flocculant injection state monitoring device for a filtration system for filtration and separation, a flocculant injection means for injecting the flocculant into the raw water, and a fluctuation state detection for detecting a fluctuation state of turbidity before and after the injection of the flocculant Means (turbidity detection means, particle number detection means, chromaticity detection means) and an abnormality detection means for detecting an abnormality when the fluctuation state detected by the fluctuation state detection means is equal to or less than a predetermined reference value. Therefore, when the turbidity fluctuation state is equal to or less than the predetermined reference value, it is determined that a flocculant injection failure has occurred, and the system abnormality can be grasped at an early stage. Therefore, even if a membrane filtration device is connected to the subsequent stage, it is possible to suppress the occurrence of fouling at an early stage by the filtration membrane of the membrane filtration device as much as possible.

  The filtered water filtered by the tower-type filtration device is supplied to the membrane filtration device and separated into permeated water and concentrated water, and the membrane filtration device has at least one of the raw water temperature and water quality. Water recovery rate control means for controlling the water recovery rate based on any one of the above, and the abnormality detection means has water recovery rate reduction means for reducing the water recovery rate when the abnormality is detected. Therefore, when a poor injection of the flocculant occurs, it is possible to avoid the occurrence of a system failure as much as possible by reducing the water recovery rate.

  In addition, an air vent valve that removes air that has entered the coagulant injection system including the coagulant injecting means is provided, and the abnormality detecting means is an operation command that issues an operation command to the air vent valve when the abnormality is detected. If the air enters the flocculant injection system, the air that has entered the flocculant injection system can be discharged from the air vent valve, resulting in a system abnormality caused by poor injection of the flocculant. Can be eliminated quickly and easily.

  Further, since the abnormality detection means has an alarm means for emitting an alarm sound when the abnormality is detected, when a system abnormality occurs, the system abnormality can be quickly grasped by the alarm sound, The user can quickly cope with the system abnormality.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram showing an embodiment of a filtration system provided with a flocculant injection monitoring device according to the present invention.

  The filtration system includes a raw water line 1 through which raw water passes, an injection monitoring device 3 for monitoring an injection state of polyaluminum chloride (hereinafter referred to as “PAC”) 2 as a flocculant into raw water, and an injection of PAC 2. Sand filtration device (tower filtration device) 4 to which raw water is supplied, and reverse osmosis membrane device (hereinafter referred to as “RO device”) for treating the filtrate water supplied from sand filtration device 4 (membrane filtration device) 5, a production water line 6 through which production water (permeated water) that has passed through the RO device 5 passes, and a control unit 7 that controls the entire system. Further, a dispersant injection device 8 is provided between the sand filtration device 4 and the RO device 5, and by injecting an appropriate amount of the dispersant 9 stored in the dispersant injection device 8 into filtered water, Scale precipitation is avoided as much as possible.

  The injection monitoring device 3 includes a PAC injection device (flocculating agent injection means) 10 in which the PAC 2 is stored, an injection pipe 11 that guides the PAC 2 to the raw water line 1, an injection pump 12 interposed in the injection pipe 11, An air vent valve 13 for discharging the air that has entered the injection pipe 11 and the PAC injection device 10 to the outside, a bypass line 14 for bypassing the injection point of the PAC 2, a three-way switching valve 15 interposed in the bypass line 14, and the three-way And a turbidimeter 16 connected to one port of the switching valve 15. The PAC injection device 10, the injection tube 11, and the injection pump 12 constitute a PAC injection system 32.

  The turbidimeter 16 is supplied with raw water before PAC injection or raw water after PAC injection by switching the port of the three-way switching valve 15. Then, the turbidity before and after the injection of the PAC agent is measured, and the detection signal is transmitted to the control unit 7. The turbidity measurement method is not particularly limited, but can be measured with high accuracy by, for example, a 90-degree scattered light method.

  The sand filtration device 4 contains filter sand (anthracite as required), and removes impurities such as suspended substances contained in the raw water. In addition, the sand filter 4 has a built-in timer, and periodically performs a regeneration process by interrupting the supply of raw water. That is, after entering a regeneration mode every predetermined time (for example, every 1 to 2 days), driving a backwash pump (not shown) and backwashing, washing with water after a predetermined time, and regenerating filter media such as filter sand To do.

  The RO device 5 includes, for example, an RO module 17 including an RO membrane element (hereinafter referred to as “RO membrane”) 17 a wound in a spiral shape, a water temperature sensor 18 for detecting the temperature of raw water, and a pressure pump 19. And have. The RO module 17 is separated into a primary side to which raw water is supplied and a secondary side that outputs permeated water that has passed through the RO membrane 17a.

  Further, the RO device 5 includes a circulating water line 20 that circulates a part of the concentrated water that has not permeated the RO membrane 17a to the raw water side, and a drain line 21 that drains the remainder of the concentrated water outside the system. It is connected.

  Specifically, the circulating water line 20 is branched from the middle of the drainage line 21 and connected to the upstream side of the pressurizing pump 19, and a constant flow rate control valve 22 is interposed in the circulating water line 20. A part of the concentrated water is combined with the filtered water from the sand filtering device 4 and supplied to the RO module 17.

  Further, the drain line 21 is branched to the first to third drain lines 21a to 21c on the downstream side of the branch point of the circulating water line 20, and the constant flow valve is provided to the first to third drain lines 21a to 21c. First to third drain valves 23a to 23c having a mechanism (not shown) are interposed.

  The first to third drain valves 23a to 23c are set to have different drain flow rates by the constant flow valve mechanism. For example, when only the first drain valve 23a is opened, the drainage flow rate is set so that the water recovery rate η is 95%, and when only the second drain valve 23b is opened, The drainage flow rate is set so that the recovery rate η is 90%, and when only the third drainage valve 23b is opened, the drainage flow rate is set so that the water recovery rate η is 80%.

  The water recovery rate η is expressed by mathematical formulas (1) and (2).

η = Qp / Qf × 100 (1)
Qf = Qp + Qc (2)
Here, Qp is a permeate flow rate, Qf is a supply water flow rate, and Qc is a drainage flow rate.

  Since the drainage rate of the drainage line 21 is (100−η), the water recovery rate η is 65% when the first to third drainage valves 23a to 23c are all opened, and the first drainage valve 70% when only 23a is closed, 75% when only second drain valve 23b is closed, and 85% when only third drain valve 23c is closed. That is, the water recovery rate η can be adjusted in steps of 5% over a wide range from 65% to 95%.

  The control unit 7 is electrically connected to the sand filtration device 4 and the RO device 5 via the signal line 24 and the signal line 25, and is also connected to the turbidimeter 16 and the air vent valve 13 via the signal line 26 and the signal line 27. And is part of the flocculant injection monitoring apparatus of the present invention. The control unit 7 stores an input / output unit that performs interface operations with the sand filtration device 4, the RO device 5, the turbidimeter 16, the air vent valve 13, and the like, and a predetermined calculation program, a table, and the like. A ROM, a RAM for storing calculation results and used as a work area, and a CPU for controlling the entire system are provided.

  Further, the control unit 7 has water recovery rate control means for controlling the water recovery rate based on the water temperature detected by the water temperature sensor 18.

  That is, since the solubility of dissolved salts such as silica is lowered when the water temperature is lowered, the scale is likely to precipitate. Therefore, in order to suppress the precipitation of scale on the RO membrane 17a, it is necessary to increase the amount of drainage and decrease the water recovery rate η. On the other hand, when the water temperature rises, the solubility of the dissolved salts increases, so that the scale is difficult to precipitate. Therefore, in this case, it is desirable to increase the water recovery rate η to improve the production capacity of permeated water (product water).

  Therefore, in the present embodiment, the water recovery rate η according to the water temperature is calculated so as to obtain permeated water (product water) with high efficiency while suppressing the precipitation of scale, and based on this calculation result, The first to third drain valves 23a to 23c are opened and closed, and thereby the water recovery rate η is controlled to be optimum.

  Further, the control unit 7 detects a fluctuation state detecting means for detecting a fluctuation state of turbidity before and after the injection of the PAC 2, and detects an abnormality when the fluctuation state detected by the fluctuation state detecting means is equal to or less than a predetermined reference value. An abnormality detection means.

  FIG. 2 is a graph showing the relationship between PAC concentration and turbidity. The horizontal axis represents PAC concentration (mg / L), and the vertical axis represents turbidity (NTU).

  As is clear from FIG. 2, the turbidity is 0.23 NTU before PAC injection, that is, when the PAC concentration is 0, but when PAC2 is injected into the raw water, the turbidity increases rapidly, When the PAC concentration in water is 1 mg / L, the turbidity is about 0.53 NTU. Thus, the turbidity is significantly different before and after PAC injection.

  Therefore, in the first embodiment, the turbidity fluctuation state before and after the injection of PAC is detected, whether or not the PAC is normally injected into the raw water is constantly monitored, and the system abnormality due to the defective injection of PAC2 is detected. Detected.

  FIG. 3 is a flowchart illustrating a control procedure according to the first embodiment.

  In step S1, the turbidity upstream of the PAC injection point is measured by the turbidimeter 16. That is, the turbidity of the raw water before PAC injection is measured, and the measurement result is transmitted to the control unit 7. Next, in step S2, the port of the three-way switching valve 15 is switched, and the turbidity downstream of the PAC injection point is measured by the turbidimeter 16. That is, the turbidity of raw water after PAC injection is measured, and the measurement result is transmitted to the control unit 7.

  In subsequent step S3, a difference ΔS1 (variation state) between the measurement results in steps S1 and S2 is calculated. In step S4, it is determined whether or not the difference ΔS1 is larger than a predetermined reference value R1 (for example, 0.2 NTU). If the answer is affirmative (Yes), it is determined that the PAC is normally injected, and the process returns to step S1.

  On the other hand, if the answer to step S4 is negative (No), that is, if the difference ΔS1 is equal to or less than the predetermined reference value R1, it is determined that a defective injection of PAC2 has occurred, and the process proceeds to step S5. In step S5, it is determined whether an operation command for the air vent valve 13 is issued in the previous routine. If the answer is negative (No), it is determined that there is a risk of poor injection of PAC2 because air has entered the PAC injection system 32, and the process proceeds to step S6 where the air vent valve 13 is operated. A command is issued and the process returns to step S1.

  Then, Steps S1 to S3 are executed, and it is determined again in Step S4 whether or not the difference ΔS1 is larger than the predetermined reference value R1. If the answer is affirmative (Yes), it is determined that the abnormal state has been eliminated as a result of the air being discharged from the air vent valve 13 in the previous routine, and the process returns to step S1.

  On the other hand, if the answer to step S4 is negative (No), since the air vent valve 13 has been operated in the previous routine, the answer to step S5 is affirmative (Yes), and the process proceeds to step S7. In step S7, an alarm is sounded to let the user grasp the abnormality, and in the following step S8, the first to third drain valves 23a to 23c are controlled to be opened and lowered to reduce the water recovery rate η. That is, in this case, since the PAC 2 is not normally injected, the impurities that should be removed by the sand filtration device 4 also flow into the RO device 5, and as a result, fouling may occur in the RO membrane 17 a. Therefore, the system is quickly dealt with while the operation is continued by forcibly reducing the water recovery rate η. In addition, the user who has grasped the injection failure checks the PAC injection device 10, and when the PAC injection device 10 is in an empty state, the system abnormality can be quickly resolved by replenishing the PAC injection device 10 with PAC2. It becomes possible.

  As described above, according to the first embodiment, when the difference ΔS1 becomes equal to or smaller than the predetermined reference value R1, it is determined that a PAC injection failure has occurred, and first, the air release valve 13 is operated to operate the PAC injection system. The air entering 32 is discharged from the air vent valve 13. If the PAC2 injection failure is still not resolved, an alarm sound is generated and the water recovery rate η is lowered to detect the system abnormality at an early stage, thereby avoiding the occurrence of fouling in the RO membrane 17a as much as possible. On the other hand, it is possible to quickly cope with the system abnormality.

  FIG. 4 is a system configuration diagram showing a second embodiment of the present invention. In the second embodiment, a particle number counter 28 is provided in place of the turbidimeter 16 (FIG. 1). ing.

  The particle number counter 28 counts the number of particles in a specific particle size range in the raw water by, for example, a laser scattered light method. That is, the raw water before the PAC injection and the raw water after the PAC injection are supplied to the particle number counter 28 by switching the port of the three-way switching valve 15 as in the turbidimeter described above. Then, the number of particles before and after PAC injection is measured, and the detection signal is transmitted to the control unit 33.

  FIG. 5 is a graph showing the relationship between the PAC concentration and the number of particles. The horizontal axis represents the PAC concentration (mg / L), and the vertical axis represents the count (number / mL) of the number of particles of 0.5 to 1.0 μm.

  As is clear from FIG. 5, before PAC injection, that is, when the PAC concentration is 0, the number of particles of 0.5 to 1.0 μm is about 1000 to 4000 particles / mL, but PAC2 is injected into the raw water. Then, the number of particles increases linearly, and when the PAC concentration in the raw water is 5 mg / L, the number of particles of 0.5 to 1.0 μm exceeds 20000 / mL. Thus, the number of particles in the raw water is significantly different before and after PAC injection.

  Therefore, in the second embodiment, the fluctuation state of the number of particles before and after the injection of PAC is detected, whether or not the PAC is normally supplied to the raw water is constantly monitored, and the system abnormality due to the defective injection of PAC2 is detected. Detected.

  FIG. 6 is a flowchart showing a control procedure of the second embodiment.

  In step S <b> 11, the number of particles upstream of the injection site of PAC <b> 2 is measured by the particle number counter 28, and the measurement result is transmitted to the control unit 33. Next, in step S <b> 12, the number of particles on the downstream side of the PAC 2 injection location is measured by the particle number counter 28, and the measurement result is transmitted to the control unit 33.

  In subsequent step S13, a difference ΔS2 (variation state) between the measurement results in steps S11 and S12 is calculated. In step S14, it is determined whether or not the difference ΔS2 is larger than a predetermined reference value R2 (for example, 5000 / mL). If the answer is affirmative (Yes), it is determined that the PAC is normally injected, and the process returns to step S11.

  On the other hand, if the answer to step S14 is negative (No), that is, if the difference ΔS1 is equal to or less than the predetermined reference value R1, the process proceeds to step S15 to determine whether or not an operation command for the air vent valve 13 was issued in the previous routine. If the answer is negative (No), that is, if the difference ΔS2 is equal to or less than the predetermined reference value R2 in the current routine, the PAC injection system 32 may be infused, which may result in defective PAC2 injection. It is judged that there is, and it progresses to step S16, issues an operation command to the air vent valve 13, and returns to step S11.

  Then, Steps S11 to S13 are executed, and it is determined again in Step S14 whether or not the difference ΔS2 is larger than the predetermined reference value R2. If the answer is affirmative (Yes), it is determined that the abnormal state has been eliminated as a result of the air being discharged from the air vent valve 13 in the previous routine, and the process returns to step S11.

  On the other hand, if the answer to step S14 is negative (No), the answer to step S15 is affirmative (Yes) because the air vent valve 13 was operated in the previous routine, and the process proceeds to step S17. In step S17, as in the first embodiment, a warning sound is emitted to let the user grasp the abnormality, and in subsequent step S18, the first to third drain valves 23a to 23c are controlled to open and close, and the water recovery rate is determined. Operate with η reduced.

  As described above, according to the second embodiment, as in the first embodiment, when the difference ΔS2 is equal to or less than the predetermined reference value R2, it is determined that an injection failure of PAC2 has occurred. The air vent valve 13 is operated to discharge the air entering the PAC injection system 32 from the air vent valve 13. If the PAC2 injection failure is still not resolved, an alarm is sounded and the water recovery rate η is lowered to detect the system abnormality at an early stage, thereby avoiding the occurrence of fouling in the RO membrane 17a as much as possible. On the other hand, it is possible to promptly cope with a system abnormality caused by an injection failure such as replenishment of the PAC 2 to the PAC injection device 10.

  FIG. 7 is a system configuration diagram showing the third embodiment of the present invention. That is, in the third embodiment, as a tower-type filtration device, an iron removal / manganese removal filtration device 29 is provided instead of the sand filtration device 4 in FIG. The control unit 34 is electrically connected. Further, the RO device 5 does not have a water recovery rate η switching mechanism, and the drain line 30 is provided with only one drain valve 31.

  In the iron removal / manganese removal filter 29, anthracite obtained by pulverizing anthracite and granulated is layered on a manganese oxidation catalyst. Then, the iron content in the raw water is oxidized and precipitated by sodium hypochlorite injected by a hyponitrous injection device (not shown), thereby removing the iron content from the raw water. Further, the manganese component in the raw water is oxidized and removed by the manganese oxidation catalyst.

  In addition, the iron removal / manganese removal filter 29 has a built-in timer, which periodically shuts off the supply of raw water and performs a regeneration process. That is, the iron removal / manganese removal filter 29 enters the regeneration mode every predetermined time (for example, every 1 to 2 days), and after the backwash pump (not shown) is driven to perform backwashing, after a predetermined time has elapsed. Washing with water, thereby regenerating the filter medium (anthracite and manganese oxidation catalyst).

  In the third embodiment, processing is performed in substantially the same manner as in the first embodiment, except that the processing step of step S8 (FIG. 3) is not provided.

  That is, when the difference ΔS1 is equal to or smaller than the predetermined reference value R1, it is determined that a PAC2 injection failure has occurred. First, the air vent valve 13 is operated to discharge the air entering the PAC injection system 32 from the air vent valve 13. If the PAC2 injection failure is still not resolved, an alarm sound is emitted. As a result, the system abnormality can be grasped at an early stage, and the system abnormality can be quickly dealt with.

  The present invention is not limited to the above embodiment. In the above embodiment, the turbidity change state before and after the PAC injection is detected by the turbidimeter 16 or the particle number coefficient unit 28, but the turbidity change state before and after the PAC injection is detected by the chromaticity meter. It may be.

  In the above embodiment, PAC is used as the flocculant. However, flocculants other than PAC, for example, iron-based inorganic metal salt flocculants such as aluminum sulfate, ferric sulfate, and ferric hydrochloride are used. Needless to say, the same applies when used.

  Furthermore, in the first and second embodiments, the water recovery rate is controlled according to the water temperature, but instead of the water temperature, the water quality is detected by electric conductivity or the like, and the water recovery rate is controlled according to the water quality. You may comprise as follows.

  Moreover, in the said embodiment, although RO apparatus 5 was used as a membrane filtration apparatus, when the NF apparatus carrying an NF membrane is used, it is the same.

  Furthermore, the control flows shown in the first to third are examples, and are not limited to these flows, and it goes without saying that various modifications can be made without departing from the scope of the invention.

1 is a system configuration diagram showing an embodiment (first embodiment) of a filtration system including a flocculant injection state monitoring device according to the present invention. It is a figure which shows an example of the relationship between PAC density | concentration and turbidity. It is a flowchart which shows the control procedure of 1st Embodiment. It is a system block diagram which shows 2nd Embodiment of the filtration system provided with the injection | pouring agent monitoring apparatus of the flocculent which concerns on this invention. It is a figure which shows an example of the relationship between PAC density | concentration and the number of particles. It is a flowchart which shows the control procedure of 2nd Embodiment. It is a system block diagram which shows 3rd Embodiment of the filtration system provided with the injection | pouring state monitoring apparatus of the coagulant | flocculant which concerns on this invention.

Explanation of symbols

2 PAC (flocculating agent)
4 Sand filter (tower filter)
5 RO device (membrane filtration device)
7 Control unit (abnormality detection means)
10 PAC injection device (flocculating agent injection means)
29 Iron removal and manganese removal filtration equipment (Tower filtration equipment)
32 PAC injection system (coagulant injection system)

Claims (7)

An apparatus for monitoring the injection state of a flocculant in a filtration system that supplies raw water into which a flocculant has been injected to a tower-type filtration device and filters and separates impurities contained in the raw water,
The flocculant injection means for injecting the flocculant into the raw water, the fluctuation state detection means for detecting the fluctuation state of the turbidity before and after the injection of the flocculant, and the fluctuation state detected by the fluctuation state detection means are predetermined standards. A flocculant injection monitoring device comprising: an abnormality detection means for detecting an abnormality when the value is equal to or less than the value.   The fluctuation state detection means includes a turbidity detection means for detecting a fluctuation amount of the turbidity of the raw water, a particle number detection means for detecting a fluctuation amount of the number of particles in the raw water, and a fluctuation amount of the chromaticity of the raw water. 2. The flocculant injection monitoring apparatus according to claim 1, further comprising at least one of chromaticity detection means for detection. The filtered water filtered by the tower type filtration device is supplied to the membrane filtration device and separated into permeated water and concentrated water,
The membrane filtration device has water recovery rate control means for controlling the water recovery rate based on at least one of the water temperature and the water quality of the raw water,
The flocculant injection monitoring device according to claim 1 or 2, wherein the abnormality detection means includes water recovery rate lowering means for reducing the water recovery rate when the abnormality is detected. . An air vent valve for removing air that has entered the flocculant injection system including the flocculant injection means, and
The flocculant according to any one of claims 1 to 3, wherein the abnormality detecting means includes an operation command means for issuing an operation command to the air vent valve when the abnormality is detected. Injection monitoring device.   The flocculant injection monitoring apparatus according to any one of claims 1 to 4, wherein the abnormality detection means includes alarm means for generating an alarm sound when the abnormality is detected.   The flocculant injection according to any one of claims 1 to 5, wherein the tower type filtration device includes at least one of a sand filtration device and an iron removal / manganese removal filtration device. Monitoring device.   4. The flocculant injection monitoring device according to claim 3, wherein the membrane filtration device includes at least one of a reverse osmosis membrane device and a nanofiltration membrane device.

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