JP2018108550A - Salt concentration device and method for detecting the scale of the salt concentration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a salt concentration device and a method for detecting the scale of the salt concentration device.SOLUTION: There is provided a salt concentration device comprising: a concentration device body 14 with a filtration membrane 13 concentrating salt from the water 11 to be treated to obtain permeable water 12; a pressurization apparatus 15 for the body pressurizing the water 11 to be treated and feeding the same; a concentration apparatus 23 for detection with a filtration membrane 22 for detection provided at a concentrated water branch line Lbranching the concentrated water from a concentrated water line Lexhausting concentrated water 16 from the concentration device body 14 and further concentrating the salt from the branched concentrated water 16a to obtain permeable water 21 for detection; and a pressurization apparatus 24 for detection pressurizing the concentrated water 16a branched at the concentration apparatus 23 for detection, and using solute permeation parameters before and after the change in the water generation amount of the concentration apparatus body 14 obtained with the permeable water 12 and the permeable water 21 for detection and solution permeation parameters before and after the change in the water generating amount of the concentration device body 14 obtained with the permeable water amount of the permeable water 21 for detection and the feed water pressure of the water 11 to be treated, the presence or absence of scale adhesion variation to the concentration device body 14 is detected.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a salt concentration apparatus and a scale detection method for a salt concentration apparatus.

  Conventionally, as a device that obtains fresh water from seawater, which is the treated water, pressure is applied to the seawater and it is passed through a type of filtration membrane called reverse osmosis membrane (RO membrane: Reverse Osmosis Membrane) to concentrate and remove the salt content of seawater. Accordingly, a desalination apparatus is used that produces fresh water (permeated water) to be used as clean water by desalinating seawater.

  In this desalination apparatus, when the seawater is concentrated at the surface portion of the reverse osmosis membrane, the inorganic components contained in the seawater are precipitated and the deposit (scale) adheres to the reverse osmosis membrane, the reverse osmosis membrane is blocked. Therefore, the permeation | transmission performance of raw water in a reverse osmosis membrane falls. Therefore, the desalination apparatus calculates the permeation performance of the reverse osmosis membrane obtained during operation, and determines the presence or absence of scale deposition on the reverse osmosis membrane surface from the degree of decrease in the permeation performance of the reverse osmosis membrane.

  In addition, as an example of a method for monitoring the reverse osmosis membrane, for example, organic substances, inorganic substances, fungi, and the like attached to the reverse osmosis membrane are directly monitored visually using a part of each of the supply liquid and the concentrated liquid, and reverse osmosis is also performed. There has been proposed a method of directly monitoring the scale generated in the film visually (see, for example, Patent Document 1).

In addition, for example, mine wastewater other than seawater includes mine wastewater, which contains pyrite (FeS ₂ ), and this pyrite is oxidized to produce SO ₄ ²⁻ . Inexpensive Ca (OH) ₂ is used to neutralize mine wastewater. For this reason, the mine wastewater is rich in Ca ²⁺ and SO ₄ ^2- . It is also known that brine, sewage, and factory wastewater are rich in Ca ²⁺ and SO ₄ ^2- . Further, in the cooling tower, heat exchange is performed between the high-temperature exhaust gas discharged from the boiler or the like and the cooling water. Since a part of the cooling water becomes steam by this heat exchange, ions in the cooling water are concentrated. Therefore, the cooling water (blow-down water) discharged from the cooling tower is in a state in which ion concentrations such as Ca ²⁺ and SO ₄ ^2- are high.

  The water containing a large amount of these ions is subjected to a desalting treatment. As a concentrating device for performing a desalting treatment, for example, a reverse osmosis membrane device, a nanofiltration membrane device, an ion exchange membrane device and the like are known.

However, when desalting using these devices, high concentrations of cations (for example, calcium ions (Ca ²⁺ )) and anions (for example, sulfate ions (SO ₄ ²⁻ )) are used to obtain the fresh water. In addition, when these ions are concentrated on the membrane surface, they may exceed the solubility limit of calcium sulfate (gypsum (CaSO ₄ )), which is a hardly soluble mineral salt, and precipitate as deposits on the membrane surface, and the permeate permeate flows. There is a problem that the bundle (flux) decreases.

  For this reason, conventionally, as a method for monitoring the reverse osmosis membrane, for example, by using a cell for monitoring the reverse osmosis membrane of the reverse osmosis membrane device, it is possible to detect the formation of concentrated salt crystals by visual judgment. There is a proposal (Patent Document 2).

JP 2008-253953 A Special table 2009-524521

  Here, in the method of monitoring the reverse osmosis membrane of Patent Document 1, coloring is performed by adding a stain to a foreign substance (organic matter, inorganic matter, fungi, etc.), and direct monitoring is performed on the organic matter and fungi. Has specifically disclosed a dyeing agent, but for inorganic substances, there are only descriptions such as dyes that are adsorptive to inorganic substances, and even if there is an appropriate dyeing agent, periodic dyeing is performed. In the method of adding and monitoring the dye, a problem occurs in the processing of the dye. The method of monitoring by adding a staining agent when an abnormality occurs reduces the burden of processing the staining agent, but when the permeation performance of the reverse osmosis membrane decreases to the point where the performance deterioration of the reverse osmosis membrane can be determined, washing is performed. As a result, scale deposition may have progressed to a level where recovery is difficult. Therefore, in order to remove the scale deposited on the reverse osmosis membrane and wash the reverse osmosis membrane, there is a problem that the filtration treatment operation of the filtration device must be stopped and the production efficiency of the permeated water is poor.

  In addition, in the monitoring method proposed by Patent Document 2, the generation mechanism of deposits (for example, mineral salt crystals) is a deposit with growth of nano-level crystal nuclei. The pore size of the reverse osmosis membrane surface of the reverse osmosis membrane device is at a nano level, and if a deposit of sub-μm or less exists on the membrane surface, the reverse osmosis membrane is blocked. In order to visually confirm the deposits of sub-μm or less, it is substantially difficult to photograph with an optical photographing apparatus (for example, an optical microscope), and a photographing apparatus such as an electron microscope is necessary. There is a problem that observation is not possible. Furthermore, since the concentrated water of the reverse osmosis membrane device flows on the surface of the reverse osmosis membrane that can be visually observed, it is substantially difficult to continuously observe the surface of the reverse osmosis membrane with high accuracy through the flowing liquid. There is a problem.

  The present invention provides a salt concentration device and a scale detection method for a salt concentration device that can detect the properties of water to be treated and the presence or absence of scale on the membrane of the concentration device without stopping the operation of the concentration device. The task is to do.

  The first invention of the present invention for solving the above-mentioned problems is a concentration device body having a filtration membrane for concentrating salinity from treated water to obtain permeated water, and supplying the treated water to the concentration device body. A supply line that is interposed in the supply line, pressurizes and supplies the water to be treated to the concentration apparatus body, and a concentration water line that discharges the concentration water from the concentration apparatus body, Concentrated water branch line for branching a part of the concentrated water from the concentrated water line, and a filtration membrane for detection that is provided in the concentrated water branch line and further concentrates salt from the branched concentrated water to obtain permeated water for detection. A concentration device for detection, a pressure device for detection, which is interposed in the concentrated water branch line, and supplies the pressurized concentrated water branched to the concentration device for detection, and the permeate and the permeation for detection The concentrator book obtained from water and more Solute permeation parameters before and after the change in the amount of water produced, and the solution permeation parameters before and after the change in the amount of water produced in the concentration device body determined from the amount of permeated water for the detection permeate and the supply water pressure of the treated water, A salinity concentrating device comprising: a detecting unit configured to detect the presence or absence of a scale adhesion fluctuation on the concentrating device main body.

  A second invention is characterized in that, in the first invention, the solute permeation parameter is obtained from the electric conductivity of the permeated water for detection before and after the change in the water production amount of the main body of the concentrator and the electric conductivity of the permeated water. In the salinity concentrator.

  According to a third invention, in the first invention, the solution permeation parameter is determined by a permeated water amount of detection permeate before and after a change in a water production amount of the concentrator main body and a supply water pressure of water to be treated to the concentrator main body. It exists in the salt concentration apparatus characterized by calculating | requiring.

  A fourth invention is characterized in that, in any one of the first to third inventions, the pressurization ratio of the pressurizing device for detection is 1/2 to 1/50 of the pressure of the pressurizing device for the main body. In the salinity concentrator.

  The fifth aspect of the present invention is a salt concentration step of concentrating salt from the water to be treated by a filtration membrane and separating it into permeate and concentrated water, and increasing the water pressure of a part of the concentrated water in which the separated salt is concentrated, The salt concentration step for detection to obtain the permeated water for detection while further improving the concentration rate and to obtain the permeated water for detection, and before and after the change in the water production amount of the concentrator main body obtained from the permeated water and the permeated water for detection Based on the solute permeation parameters, the solution permeation parameters before and after the change in the water production amount of the concentration device main body obtained from the permeated water amount of the detection permeated water and the supply water pressure of the treated water, the scale adhesion fluctuation to the concentration device main body And a detection step for detecting the presence or absence of the salt concentration apparatus.

  A sixth invention is characterized in that, in the fifth invention, the solute permeation parameter is obtained from the electrical conductivity of the permeated water for detection before and after the change in the water production amount of the main body of the concentrator and the electrical conductivity of the permeated water. It is in the scale detection method of the salinity concentration apparatus.

  According to a seventh invention, in the fifth invention, the solution permeation parameter is determined by a permeated water amount of the detection permeate before and after a change in the water production amount of the concentrator main body and a supply water pressure of the water to be treated to the concentrator main body. It is in the scale detection method of the salt concentration apparatus characterized by calculating | requiring.

  An eighth invention is characterized in that, in any one of the fifth to seventh, the pressurization ratio of the detection pressurizing device is 1/2 to 1/50 of the pressure of the main body pressurizing device. There is a scale detection method for the salinity concentration device.

  According to the present invention, when supplying a part of the concentrated water from the main body of the concentrating device to the detecting concentrating device, the condensing water is pressurized by the detecting pressurizing device, and the permeated water and the detecting permeated water are obtained. Using the solute permeation parameters before and after the change of the water production amount of the concentrator main body, the solution permeation parameters before and after the change of the water production amount of the concentrator main body obtained from the permeated water amount of the detection permeate and the supply water pressure of the treated water, It is possible to detect the presence or absence of fluctuations in the properties (for example, TDS, temperature, etc.) of the water to be treated, or the presence or absence of fluctuations in scale adhesion to the filtration membrane of the concentrator main body. Thereby, the property of to-be-processed water and the adhesion of the scale to the concentration apparatus main body can be detected in advance during the concentration operation of to-be-processed water.

FIG. 1 is a schematic diagram of a salt concentration apparatus according to Example 1. FIG. FIG. 2 is a schematic diagram of the salt concentration apparatus according to the second embodiment. FIG. 3 is a diagram showing the relationship between the solute permeation parameter and the solution permeation parameter when the concentrated water to the concentration device for detection is pressurized. FIG. 4 is a diagram showing a scale adhesion map based on the solute permeation parameter and the solution permeation parameter when the concentrated water to the concentration device for detection is pressurized. FIG. 5 is a diagram showing the relationship between the solute permeation parameter and the solution permeation parameter when the concentration water to the concentration device for detection is not increased.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

FIG. 1 is a schematic diagram of a salt concentration apparatus according to Example 1. FIG. As shown in FIG. 1, the salt concentration device 10 </ b> A according to the present embodiment concentrates the concentration of salt water from the water to be treated 11, the concentration device main body 14 having a filtration membrane 13 that obtains the permeated water 12, and the water to be treated 11. concentrated and the supply line L ₁₁ is supplied to the apparatus main body 14, is interposed in the supply line L _11, the water to be treated 11 with pressurized body for pressurizing device 15 supplies the concentrator body 14, from the concentrator body 14 A concentrated water line L ₁₃ that discharges water 16, a concentrated water branch line L ₂₁ that branches a part of the concentrated water 16 from the concentrated water line L ₁₃ and a concentrated water branch line L _{21 that} are provided in the branched water 16a. further concentrated salt from a detection concentrator 23 having a detection filter membrane 22 to obtain the detection permeate 21 is interposed concentrated water branch line L _21, the concentrated water 16a branching to detection concentrator 23 Pressure device for detection 24, the solute permeation parameter (electric conductivity (EC)) before and after the change in the water production amount of the permeated water 12 of the concentrator main body 14 obtained from the permeated water 12 and the permeated water 21 for detection, Using the permeated water amount (Qp), the supply water pressure (Pf) of the water to be treated 11, and the solution permeation parameters before and after the change in the water production amount of the permeated water 12 of the concentrator main body 14, the properties of the water to be treated 11 (for example, TDS, temperature, pH, etc.), or a detector for detecting the presence or absence of scale adhesion to the concentrator main body 14. In this embodiment, a reverse osmosis membrane device will be described as an example of a concentration device for obtaining fresh water. However, the present invention is not limited to this, and the water to be treated 11 is permeated through the filtration membrane 13. The apparatus is not particularly limited as long as the apparatus obtains water 12 and separates it as concentrated water 16.

  The concentrator main body 14 has a filtration membrane 13 that removes salt from the water to be treated 11 pressurized by a main body pressurizing device 15 (for example, a pressurizing pump) 15 that is a pressurizing means to obtain permeated water 12. For example, the reverse osmosis membrane device is constituted by a reverse osmosis membrane module in which a reverse osmosis membrane element including a filtration membrane of a reverse osmosis membrane is loaded in a pressure vessel. The filtration membrane 13 is a liquid separation membrane that applies a pressure higher than the osmotic pressure difference between the solutions through the membrane to the high concentration side to block the solute and permeate the solvent. The treated water 11 supplied to the concentrator main body 14 is subjected to a pressure higher than the osmotic pressure on the treated water 11 side of the filtration membrane 13 using the main body pressurizing device 15, and the treated water 11 is passed through the filtration membrane 13. As a result, the permeated water 12 and the concentrated water 16 are obtained from the treated water 11.

Permeate 12 is supplied to the external water-using equipment or the like via the permeate line L _12. Concentrated water 16 salt is concentrated in concentrator body 14 is discharged out of the system through the concentrated water line L _13.

  For example, as a membrane structure when a reverse osmosis membrane (RO membrane: Reverse Osmosis Membrane) is used as a filtration membrane, a polymer membrane such as a composite membrane or a phase separation membrane can be exemplified. Examples of the material for the reverse osmosis membrane include aromatic polyamides, aliphatic polyamides, polyamide materials such as composite materials thereof, and cellulose materials such as cellulose acetate.

  Examples of the reverse osmosis membrane include an RO membrane as described above, but are not particularly limited thereto. For example, an NF membrane (Nanofiltration Membrane) may be used.

Here, the water to be treated 11 includes scale components such as seawater, mine wastewater, blowdown water of a power plant cooling tower, accompanying water at the time of oil / gas production, brine, and factory wastewater. The water to be treated 11, the body for a pressure device 15 which is provided in a supply line L _11, is pressurized to a predetermined pressure (for example 50-70 bar), reverse osmosis provided with a filtration membrane 13 of the reverse osmosis (RO) membranes It is introduced into the concentration device main body 14 which is a membrane device.

  In the concentration device main body 14, as a salt concentration step, the salt content in the water to be treated 11 is concentrated, and the water that has passed through the filtration membrane 13 is recovered as permeated water 12 that is fresh water. In addition, the concentrated water 16 in which the salinity is concentrated in the salinity concentration step is discharged or used to collect the salinity separately.

In the present embodiment, a concentrated water branch line L ₂₁ that branches a part from the concentrated water line L ₁₃ that discharges the concentrated water 16 is provided. In the concentrated water branch line L ₂₁ , the salt content is further concentrated from the branched concentrated water 16 a to obtain the permeated water 21 for detection, and as the concentrated water 25 for detection discharged from the concentrated water line L ₂₃ for detection. A detection concentrator 23 having a detection filtration membrane 22 for concentrating salt is provided. The detection filtration membrane 22 is preferably a reverse osmosis (RO) membrane. In particular, it is more preferable that the concentration is the same as that of the reverse osmosis membrane of the reverse osmosis membrane device which is the main body 14 of the concentrator.

Furthermore, the permeate line L ₁₂ for discharging the permeate 12 from the concentrator body 14, an electric conductivity meter for measuring the electrical conductivity of the permeate 12 (EC (Electric Conductivity) meter) 31A and, permeate 12 A flow meter 32A for measuring the flow rate is provided. In addition, in the detection permeate line L ₂₂ , an electric conductivity meter (EC (Electric Conductivity) meter) 31 B that measures the electrical conductivity of the detection permeate 21 and a flow rate that measures the flow rate of the detection permeate 21. A total of 32B is provided.

A main body pressure gauge P ₁ for measuring the pressure of the water to be treated 11 is provided between the main body pressure device 15 and the concentration device main body 14 in the supply line L ₁₁ . Further, a detection pressure gauge P ₂ for measuring the pressure of the branched concentrated water 16 is provided between the detection pressure device 24 and the detection concentration device 23 in the concentrated water branch line L ₂₁ . The permeate line L ₁₂ may be provided with a pressure gauge for measuring the pressure of the permeate 12 near the outlet of the filtration membrane 13. The concentrated water line L ₁₃ measures the pressure of the concentrated water 16. A pressure gauge may be provided.

Information measured by the electric conductivity meters 31A and 31B and the flow meters 32A and 32B is transmitted to the detection unit 50. The detection unit 50 calculates the amount of permeated water of the filtration membrane 13 from the measurement results of the electrical conductivity meters 31A and 31B and the flow meters 32A and 32B, and calculates the water 11 to be treated from the measurement results of the electrical conductivity meters 31A and 31B. The electrical conductivity is calculated, and the pressures of the water 11 to be treated, the permeated water 12 and the concentrated water 16 are calculated from the measurement results of the pressure gauges P ₁ and P ₂ .

  And in the detection part 50, the presence or absence of the change of the property of to-be-processed water and its trend, or the presence or absence of the adhesion of the scale to the filtration membrane 13 of the concentration apparatus main body 14 can be confirmed.

  The change in the properties of the water to be treated means that the amount of water and the quality of the apparatus body change when the temperature of the water is high or low, or when the concentration of salt contained in the water is high or low.

  Here, as a salt treatment condition of the water to be treated 11 supplied to the concentration apparatus main body 14, a so-called mass balance is constant in the present embodiment. The operation with a constant mass balance is a general operation of the reverse osmosis membrane device, and controls the supply water pressure by controlling the permeated water amount of the permeated water 12 and the concentrated water amount of the concentrated water 16 to be constant conditions. The operation mode is not. And when a scale adheres to the filtration membrane 13 of the concentration apparatus main body 14, it is the operation mode which performs the pressure | voltage rise operation of supply pressure automatically in order to ensure the amount of fresh water of the permeated water 12. FIG.

  In the case of such an operation mode in which the mass balance is constant, the concentrated water 16 from the concentrator main body 14 is supplied to the detection concentrator 23 while maintaining the pressure discharged from the concentrator main body 14.

  Here, when the property of the to-be-treated water 11 to be supplied changes (for example, the salinity concentration in the to-be-treated water 11 increases), if scale adhesion occurs on the concentrator main body 14 side, The salt concentration becomes high, and scale adhesion occurs on the detection filtration membrane 22 of the detection concentration device 23.

  When the scale to the detection filtration membrane 22 occurs, the amount of permeated water of the detection permeated water 21 decreases.

Therefore, in the present embodiment, the detection pressurizing device 24 is installed in the concentrated water branch line L ₂₁ on the upstream side of the detection concentrating device 23, and the concentrated water 16 a branched using the detection pressurizing device 24 is supplied. By increasing the pressure, the water pressure of a part of the concentrated water 16 in which the separated salinity is concentrated is increased and supplied to the detecting concentrator 23 to eliminate the decrease in the permeation amount of the detecting permeated water 21 (detecting permeated water). 21 can be ensured).

For example, when the pressure of the water to be treated 11 in the main body pressure device 15 is 70 bar,
The pressurization ratio (α) of the detection pressurizing device 24 applies a pressure of about 1/2 to 1/50 (more preferably 1/5 to 1/10) of the pressure of the main body pressurizing device 15. Is preferred. The concentrated water 16a thus branched is supplied to the concentration device for detection 23 at a pressure (Y + α) obtained by adding α to the pressure (Y) of the concentrated water 16 discharged from the concentration device main body 14.

  Here, α is preferably about 1/2 to 1/50 (more preferably, 1/5 to 1/10) of the pressure (70 bar) of the main body pressurizing device 15. A pressure of around 1/7 (10 bar) is preferred.

  When the concentration device for detection 23 is in a pressurized state, that is, when the concentrated water 16a branched from a part of the concentrated water 16 from the concentration device main body 14 is supplied to the concentration device for detection 23, In the case where the concentrated water 16a branched by the detection pressurizing device 24 is pressurized, the solute permeation parameters before and after the change in the water production amount of the permeated water 12 of the concentrating device body 14 obtained from the permeated water 12 and the detected permeated water 21 ( Solution permeation parameters (WPP: Water) before and after the change in the water production amount of the permeated water 12 of the concentrator main body 14 obtained from the SPP: Salt Permeability Parameter), the permeated water amount of the detection permeated water 21 and the supply water pressure of the treated water 11 Permeability Parameter) is used to detect the presence or absence of fluctuations in the properties of treated water 11 (eg, TDS, temperature, etc.) and the presence or absence of scale adhesion fluctuations on the filtration membrane 13 of the concentrator main body 14. Kill. Thereby, the property of to-be-processed water and the adhesion of the scale to the concentration apparatus main body can be detected in advance during the concentration operation of to-be-processed water.

  Here, in the present embodiment, the solute permeation parameter can be obtained from, for example, a measurement result of electric conductivity (EC). Specifically, before and after the water quality of the treated water 11 changes, the “electric conductivity of the detection permeated water 21 (ECp, sensor)” and “the electric conductivity of the permeated water 12 (ECp, plant)” It can be obtained by division.

  For example, in the present embodiment, as the change in the amount of the permeated water 12 of the concentrator main body 14, the ratio before and after the change in the water quality of the water to be treated 11, which is a factor causing the scale adhesion, is taken as [Relativ (ECp, sensor) / (ECp, plant)]. Here, before and after the change of the water quality of the water to be treated 11, the confirmation of the water quality change is measured at regular intervals, and when there is no change, it is further measured at regular intervals, and when there is a change, there is no change. Comparing time points. This change comparison may be made by dividing (value after change) by (value before change) ((value after change) / (value before change)), or the difference ((value after change) (Value)-(value before change)) may be obtained.

  The solution permeation parameter can be determined by the result of multiplying the amount of permeated water of the detection permeated water 21 and the supply pressure of the water to be treated 11 of the main body pressurizing device 15. Specifically, it is obtained by multiplying “the amount of permeated water of the detection permeated water 21” and “the supply water pressure of the treated water 11 to the concentrator main body 14” before and after the change in the water quality of the treated water 11. it can. Here, the “permeated water amount of the permeating water 21 for detection” and the “supply water pressure of the treated water 11 to the concentrator main body 14” are multiplied by these when the filtration membrane performance changes depending on the scale. This is to increase the result because the rate of change is large, but the present invention is not limited to multiplying these values.

  For example, in the present embodiment, as the change in the amount of the permeated water 12 of the concentrator main body 14, the ratio before and after the change in the water quality of the treated water 11 is taken, and [Relative (Qp, sensor) × (Pf, plant) ] To ask.

  An example of the results using these solute permeation parameters and solution permeation parameters is shown in FIG. In FIG. 3, as water to be treated, test water set so that the A value is 10% reduced (black circle mark), 20% reduced (white circle mark), and 40% reduced (triangular mark) is used. [Relative (ECp, sensor) / (ECp, plant)] is calculated on the horizontal axis. Similarly, the vertical axis represents the result of determining the solution permeation parameter [Relative (Qp, sensor) × (Pf, plant)] using test water.

  As shown in FIG. 3, it has been found that as the scale adhesion degree in the water to be treated increases, it tends to fall to the lower right zone from the reference (0). The reference (0) is a case where the measured values before and after the change of the water quality of the treated water 11 are confirmed and there is no change.

  Therefore, this change is mapped into alarm 1 zone, alarm 2 zone, and alarm 3 zone. For example, when it is determined that the detection result belongs to alarm 2 zone, for example, on an image (for example, a PC screen) or in sound, etc. By issuing the alarm 51, the scale to the filtration membrane 13 can be predicted in advance.

On the other hand, as shown in FIG. 5, in the case where the branching concentrated water 16 a supplied to the detection concentrating device 23 is not boosted without installing the detection pressurizing device 24 in the concentrated water branching line L _21. The plots gathered around the reference (0), and the zone of change could not be confirmed.

  In the present embodiment, when the presence or absence of scale adheres to the filtration membrane 13 of the concentration device main value 14 is confirmed before and after the change in the water production amount of the permeated water 12 of the concentration device main body 14, the present invention is limited to this. Is not to be done. You may make it confirm the presence or absence of scale adhesion by confirming the change of the water production amount of the permeated water 12 itself. In addition, in the state of the water 11 to be treated (for example, temperature, pH value, TDS (Total Dissolved Solid: concentration of total dissolved impurities (for example, copper, zinc, mercury, cadmium and other impurities))), the change rate is confirmed in advance. In addition, by creating a corresponding map or the like, it is possible to cope in advance with changes in the water to be treated 11 supplied to the concentration apparatus body 14 due to these maps.

  As described above, according to this embodiment, when a part of the concentrated water from the main body of the concentration device is supplied to the detection concentration device, the concentration water is pressurized by the detection pressure device, The solute permeation parameters before and after the change in the water production amount of the concentrator main body obtained from the above, the solution permeation parameters before and after the change in the water production amount of the concentrator main body obtained from the permeated water amount of the detection permeated water and the supply water pressure of the treated water, and Can be used to detect the presence or absence of fluctuations in the properties of the water to be treated (eg, salt concentration, TDS, temperature, pH, etc.) and the presence or absence of scale adhesion fluctuations on the filter membrane of the concentrator main body. Thereby, the property of to-be-processed water and the adhesion of the scale to the concentration apparatus main body can be detected in advance during the concentration operation of to-be-processed water.

  FIG. 2 is a schematic diagram of the salt concentration apparatus according to the second embodiment. As shown in FIG. 2, the salt concentration apparatus 10B according to the present embodiment further desalinates from the first concentrated water 16-1 of the first concentration apparatus body 14-1 using two concentration apparatus bodies. For this purpose, the second concentrator main body 14-2 is installed, and thereby fresh water of the second permeated water 12-1 is obtained. Since two sets having the same configuration as the apparatus configuration of the first embodiment are connected, the branch number is assigned to the preceding apparatus and the branch number is set to “−2”. ”Is attached, and redundant description is omitted.

  As shown in FIG. 2, when two concentration apparatus main bodies 14-1 and 14-2 are installed, the salinity concentration in the 1st concentration water 16-1 is from the salinity concentration of the to-be-processed water 11-1. Since it is also dark, the frequency of scale adhesion to the second filtration membrane 13-2 of the second concentrator body 14-2 on the rear stage side is high. Therefore, when the second concentrated water 16a-2 branched from the second concentrated water 16-2 is also introduced into the second concentration device 23-2 for the second concentration device main body 14-2. As in the first embodiment, the second pressure increasing device 24-2 is used to increase the pressure by a predetermined pressure.

  According to the present embodiment, when a part of the second concentrated water 16-2 from the second concentrating device main body 14-2 is supplied to the second detecting concentrating device 23-2, the second detection is performed. The pressure of the second concentrated water 16-2 is increased by the pressure applying device 24-2, and the permeated water of the concentrating device body 14 obtained from the second permeated water 12-2 and the second permeated water for detection 21-2. The permeated water 12 of the concentrator main body 14 determined from the solute permeation parameters before and after the change in the water production amount of 12, the permeated water amount of the second permeating water for detection 21-2, and the supply water pressure of the first concentrated water 16-1. Using the solution permeation parameters before and after the change in the water production amount, the presence or absence of fluctuations in the properties of the first concentrated water 16-1 (eg, TDS, temperature, pH, etc.), the second of the second concentrator main body 14-2 It is possible to detect the presence or absence of scale adhesion fluctuation on the filter membrane 13-2. Thereby, during the concentration operation of the water to be treated 11 or the first concentrated water 16-1, the properties of the water to be treated 11 or the first concentrated water 16-1 and the first or second concentrator main body 14 in advance. -1,14-2 can be detected to adhere to the first or second filtration membrane 13-1, 13-2.

  In the present embodiment, two concentration device main bodies are used. However, the present invention is not limited to this, and further from the second concentrated water 16-2 of the second concentration device main body 14-2. In order to desalinate, when the third concentrator body is installed, the third concentrated water is branched in the same manner, and a part of the third concentrated water is supplied to the third detecting concentrator. The pressure of the second concentrated water is increased by the third detection pressurizing device, and before and after the change in the water production amount of the permeated water 12 of the concentration device main body 14 obtained from the third permeated water and the third detected permeated water. Solute permeation parameters, solution permeation parameters before and after the change in the amount of permeated water 12 in the permeated water 12 of the concentrator body 14 obtained from the permeated water amount of the third permeating water for detection and the supply water pressure of the second concentrated water 16-2 The presence or absence of fluctuations in the properties (for example, TDS, temperature, pH, etc.) of the second concentrated water 16-2, It is possible to detect the presence or absence of scale deposition change on the third filtration membrane concentrator body. As a result, during the concentration operation of the water to be treated 11 or the first or second concentrated water 16-1, the properties of the water to be treated 11 or the first or second concentrated water 16-1 and the first or second The adhesion of the scale to the first, second, or third filtration membranes 13-1, 13-2 of the second or third concentrator main bodies 14-1, 14-2 can be detected.

10A, 10B Salt concentrator 11 Water to be treated 12 Permeated water 13 Filtration membrane 14 Concentrator main body 15 Main body pressurizer L ₁₁ Supply line 15 Main body pressurizer 16 Concentrated water 16a Branched concentrated water 21 Detection permeate 22 Filtration membrane for detection 23 Concentration device for detection 24 Pressurization device for detection 25 Concentrated water for detection 31A, 31B Conductivity meter 32A, 32B Flow meter 50 Detector 51 Alarm L ₁₂ Permeated water line L ₁₃ Concentrated water line,
L ₂₁ Concentrated water branch line L ₂₂ Permeated water line for detection L ₂₃ Concentrated water line for detection

Claims (8)

A concentration device body having a filtration membrane for concentrating salt from water to be treated and obtaining permeated water;
A supply line for supplying the treated water to the concentrator body;
A pressurizing device for a main body, which is interposed in the supply line, and pressurizes and supplies treated water to the main body of the concentration device;
A concentrated water line for discharging concentrated water from the concentrator body;
A concentrated water branch line for branching a part of the concentrated water from the concentrated water line;
A concentration device for detection having a filtration membrane for detection, which is provided in the concentrated water branch line, further concentrates salt from the branched concentrated water, and obtains permeate for detection;
A detection pressurizer that is interposed in the concentrated water branch line and that pressurizes and supplies the concentrated water branched to the detection concentrator;
The solute permeation parameters before and after the change in the water production amount of the concentrator main body obtained from the permeate and the permeate for detection, the permeate amount of the permeate for detection and the supply water pressure of the treated water were obtained. A salinity concentrating device, comprising: a detection unit that detects whether or not there is a variation in scale adhesion to the concentrating device main body using solution permeation parameters before and after a change in the amount of water produced by the concentrating device main body. In claim 1,
The salt concentration device, wherein the solute permeation parameter is obtained from the electrical conductivity of the permeated water for detection and the electrical conductivity of the permeated water before and after the change of the water production amount of the concentration device main body. In claim 1,
The salt concentration device, wherein the solution permeation parameter is obtained from a permeate amount of permeated water for detection before and after a change in a water production amount of the concentration device body and a supply water pressure of water to be treated to the concentration device body. In any one of Claims 1 thru | or 3,
The salinity concentrating device, wherein a pressurizing ratio of the detecting pressurizing device is 1/2 to 1/50 of a pressure of the main body pressurizing device. A salt concentration step of concentrating salt from the water to be treated by a filtration membrane, and separating the permeated water and concentrated water by a concentrator main body;
A salt concentration process for detection that increases the water pressure of a part of the concentrated water in which the separated salt is concentrated and supplies it to the concentration device for detection, further concentrates the salt while improving the concentration rate, and obtains permeate for detection. When,
Solute permeation parameters before and after the change in the water production amount of the concentration device main body obtained from the permeate and the permeate for detection,
Based on the solution permeation parameters before and after the change in the water production amount of the concentration device main body obtained from the permeated water amount of the detection permeated water and the supply water pressure of the treated water, the presence / absence of fluctuations in scale adhesion to the concentration device main body is detected. A scale detection method for a salinity concentrator, comprising: a detection step. In claim 5,
The scale detection method for a salinity concentration device, wherein the solute permeation parameter is obtained from electrical conductivity of permeated water for detection before and after a change in water production amount of the concentrator main body and electrical conductivity of permeated water. In claim 5,
The scale detection of the salinity concentrator characterized in that the solution permeation parameter is obtained from the amount of permeate permeate for detection before and after the change of the amount of water produced in the main body of the concentrator and the supply water pressure of the water to be treated to the main body of the concentrator. Method. In any one of Claims 5 thru | or 7,
The pressurization ratio of the detection pressurizer for pressurizing the concentrated water branched to the detection concentrator is 1/2 to 1/50 of the pressure of the main body pressurizer for pressurizing the water to be treated to the concentrator main body. A method for detecting a scale of a salinity concentrator, characterized by:

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