JP2020044457A - Water treatment device - Google Patents

Abstract

To provide a water treatment device that can suppress a transfer of a water-soluble organic matter to concentrated water that is a target of an evaporative concentration treatment.SOLUTION: A water treatment device includes: a remover, a first reverse osmosis membrane unit, a second reverse osmosis membrane unit, and a heat treatment device. The remover is filled with a renewable adsorbent, and adsorbs and removes organic substances in passing water to be treated by an adsorbent. The first reverse osmosis membrane unit separates the water to be treated that has passed through the remover into a first concentrated water and a first permeated water by a reverse osmosis membrane. The second reverse osmosis membrane unit separates the first concentrated water separated by the first reverse osmosis membrane unit into a second concentrated water and a second permeated water by a reverse osmosis membrane. The heat treatment device evaporates the water contained in the second concentrated water by applying heat treatment to the second concentrated water separated by the second reverse osmosis membrane unit.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a water treatment device.

  In recent years, laws and regulations for realizing a sound water circulation have been strengthened. ZLD (Zero Liquid Discharge) recycles and uses water in factories to reduce the risk of water pollution, regenerates and reuses wastewater, and further reduces wastewater discharged from factories to zero. This is a concept for preserving the water environment.

  By the way, the desalination / concentration technology using a reverse osmosis (RO) membrane is a method in which water to be treated is introduced under pressure into a RO membrane process, and water (deionized water) permeated through the membrane and concentrated water are used. It consists of the basic process of obtaining. This basic process is excellent for the purpose of obtaining deionized water and concentrating the water to be treated, but also transfers the water-soluble organic matter derived from the water to be treated to the concentrated water side in addition to the ions. In order to achieve ZLD, heat treatment such as evaporation and concentration is required for a concentrated solution in which a water-soluble organic substance is dissolved. However, when performing an evaporative concentration operation on a concentrated solution in which a water-soluble organic substance is dissolved, the effect of a water-soluble organic substance additive such as a scale inhibitor added for stable operation of evaporative concentration and an antifoaming agent is reduced. The risk of being curbed may increase.

U.S. Pat. No. 9,206,060

  Therefore, an object of the present invention is to provide a water treatment apparatus that can suppress the transfer of water-soluble organic substances to concentrated water to be subjected to an evaporative concentration treatment.

  According to the embodiment, the water treatment device includes a remover, a first reverse osmosis membrane unit, a second reverse osmosis membrane unit, and a heat treatment device. The remover is filled with a regenerable adsorbent and adsorbs and removes organic matter in the water to be treated that passes through the adsorbent. The first reverse osmosis membrane unit separates the water to be treated that has passed through the remover into a first concentrated water and a first permeated water by a reverse osmosis membrane. The second reverse osmosis membrane unit separates the first concentrated water separated by the first reverse osmosis membrane unit into a second concentrated water and a second permeated water by a reverse osmosis membrane. The heat treatment device evaporates water contained in the second concentrated water by performing a heat treatment on the second concentrated water separated by the second reverse osmosis membrane unit.

FIG. 1 is a block diagram illustrating a functional configuration of the water treatment apparatus according to the first embodiment. FIG. 2 is a block diagram illustrating a functional configuration of a water treatment apparatus in which the remover illustrated in FIG. 1 is provided by adopting a merry-go-round type. FIG. 3 is a block diagram showing another configuration of the water treatment apparatus shown in FIG. FIG. 4 is a block diagram showing another configuration of the water treatment apparatus shown in FIG. FIG. 5 is a block diagram illustrating a functional configuration of a water treatment device according to the second embodiment. FIG. 6 is a block diagram showing another functional configuration of the water treatment apparatus shown in FIG. FIG. 7 is a block diagram showing another functional configuration of the water treatment apparatus shown in FIG. FIG. 8 is a block diagram showing another functional configuration of the water treatment apparatus shown in FIG. FIG. 9 is a block diagram showing another functional configuration of the water treatment apparatus shown in FIG. FIG. 10 is a block diagram illustrating a functional configuration of a water treatment apparatus according to the third embodiment. FIG. 11 is a block diagram showing another functional configuration of the water treatment apparatus shown in FIG. FIG. 12 is a block diagram illustrating another functional configuration of the water treatment apparatus illustrated in FIG.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram illustrating an example of a functional configuration of a water treatment device 1 according to the first embodiment. The water treatment apparatus 1 shown in FIG. 1 includes a first reverse osmosis membrane unit 100, a second reverse osmosis membrane unit 200, a remover 300, booster pumps 400-1 and 400-2, and an evaporator 500.

  The remover 300 is, for example, an adsorption tower that contains a water treatment medium that adsorbs and removes organic matter in the water to be treated. The remover 300 is provided, for example, before the first reverse osmosis membrane unit 100. The remover 300 may be realized in any of a fixed bed, a moving bed, and a fluidized bed.

  The adsorbent filled in the remover 300 is selected, for example, according to the water-soluble organic components in the water to be treated. For example, when charged water is contained in the water to be treated, an adsorbent having a reverse charge is selected. As the adsorbent, for example, an adsorbent having a pore size according to the size of the organic substance to be adsorbed is selected. Further, for example, when the water to be treated contains a hydrophobic water-soluble organic substance, a hydrophobic adsorbent is selected.

  The adsorbent is realized by, for example, an adsorbent capable of regenerating a chemical solution. For example, an adsorbent that can be regenerated with an alkali agent or the like is selected. In addition, from the viewpoint of reducing the amount of regenerated medicine, it is also desirable to select an adsorbent using a material capable of promoting regeneration using heat such as hot water and steam. The adsorbent is desirably selected from those having a uniform particle size within a certain range. This is because it becomes possible to take control measures such as outflow prevention measures during operation.

  Examples of the adsorbent applicable in the remover 300 include a styrene-divinylbenzene copolymer porous material, an acryl-divinylbenzene copolymer porous material, and a phenol-formaldehyde condensate porous material. The water to be treated, from which organic substances have been removed by the remover 300, is pressurized to a preset pressure by a pressure increasing pump 400-1 and supplied to the first reverse osmosis membrane unit 100. The preset pressure is, for example, a pressure higher than at least the osmotic pressure.

  The remover 300 is provided with a bypass path 3001 that can bypass the remover 300. For example, when the amount of organic substances dissolved in the water to be treated is small due to a low operation rate of the device provided in the preceding stage of the remover 300, for example, the water to be treated is turned into the bypass path 3001 by operating a valve or the like. Is derived to The amount of the organic matter dissolved in the water to be treated is obtained based on, for example, water quality measured by a water quality meter (not shown) disposed at an inlet and / or an outlet of the remover 300. As the water quality meter, for example, an ultraviolet-visible spectrophotometer, a fluorescence spectrophotometer, or the like is used. This makes it possible to supply the water to be removed to the remover 300 only when there is a large amount of dissolved organic matter in the water to be treated, and to use the adsorbent efficiently.

  Although FIG. 1 shows a case where there is one remover 300, the present invention is not limited to this. A plurality of removers 300 may be provided. For example, in the case of a fixed bed type, a plurality of removers 300 may be used to form a parallel multi-stage configuration, or a series multi-stage configuration may be a merry-go-round type that is changed by changing the water flow path.

  FIG. 2 is a block diagram illustrating a configuration example of the water treatment apparatus 1 in which the remover 300 is provided in a merry-go-round style. In the water treatment apparatus 1 shown in FIG. 2, the removers 300-1 to 300-3 are connected in series, and the remover 300-4 is on standby. A water quality meter is arranged at, for example, an inlet and / or an outlet of the removers 300-1 to 300-4. When it is determined that the adsorbent of the remover 300-1 should be regenerated based on the measurement result of the water quality meter provided in the remover 300-1 disposed at the highest level, the remover 300-1 is on standby, A remover 300-4 is added to the series connection. At this time, for example, the supply path is switched such that the water to be treated passes in the order of the removers 300-2, 300-3, and 300-4. For example, a regenerating solution is supplied to the remover 300-1 in the standby state, and the adsorbent is regenerated. As described above, the regeneration process is performed by removing the sufficiently used uppermost remover 300 from the route, and the remover after the regeneration process is arranged at the lowest position of the route, so that the adsorbent is used efficiently. It becomes possible. Further, even when the remover 300 is regenerated, it is not necessary to stop the booster pump 400-1.

  The first reverse osmosis membrane unit 100 is a unit that separates the water to be treated supplied at a high pressure into a permeated water from which dissolved salts are removed and a concentrated water in which dissolved salts are concentrated. The first reverse osmosis membrane unit 100 is provided before the second reverse osmosis membrane unit 200. The first reverse osmosis membrane unit 100 includes, for example, a pressure vessel 101 and a reverse osmosis membrane element 102 installed in the pressure vessel 101. The reverse osmosis membrane element 102 includes a reverse osmosis membrane 1021. As the reverse osmosis membrane 1021, for example, a spiral or hollow fiber membrane is used. Although FIG. 1 shows one reverse osmosis membrane element 102 installed in the pressure vessel 101, the number of reverse osmosis membrane elements 102 installed in the pressure vessel 101 is plural. It does not matter.

  The first reverse osmosis membrane unit 100 sends the high-pressure concentrated water separated by the reverse osmosis membrane 1021 to a subsequent stage, and discharges the permeated water separated by the reverse osmosis membrane 1021. The concentrated water sent out from the first reverse osmosis membrane unit 100 is pressurized to a preset pressure by the pressurizing pump 400-2 and supplied to the second reverse osmosis membrane unit 200. When the concentrated water sent from the first reverse osmosis membrane unit 100 has, for example, at least a pressure higher than the osmotic pressure, it is not necessary to provide the booster pump 400-2.

  FIG. 1 shows an example in which the first reverse osmosis membrane unit 100 has one pressure vessel 101. However, it is not limited to this. A plurality of pressure vessels 101 may be provided depending on the solute concentration in the water to be treated and the amount of the water to be treated. At this time, the pressure vessel 101 can have various configurations such as a parallel arrangement, a series multi-stage arrangement, and a composite form thereof.

  Further, the first reverse osmosis membrane unit 100 may be provided with a power recovery device according to the operating pressure and the size of the device. The power recovery device is a device that recovers pressure energy from high-pressure concentrated water sent from the first reverse osmosis membrane unit 100.

  In addition, the first reverse osmosis membrane unit 100 may be provided with an introduction path for a scale inhibitor, a slime inhibitor having an oxidation-reduction function, a detergent, and / or wash water according to the quality of the water to be treated. Absent. At this time, for example, a water quality meter is arranged at the entrance of the first reverse osmosis membrane unit 100. Then, by operating the introduction path based on the water quality measured by the water quality meter, the addition operation of the scale inhibitor and the slime inhibitor and the cleaning operation of the first reverse osmosis membrane unit 100 are performed.

  The second reverse osmosis membrane unit 200 is a unit that separates the concentrated water supplied by being pressurized to a high pressure into permeated water from which dissolved salts are removed and concentrated water in which dissolved salts are further concentrated. The second reverse osmosis membrane unit 200 is provided before the evaporative concentrator 500. The second reverse osmosis membrane unit 200 includes, for example, a pressure vessel 201 and a reverse osmosis membrane element 202 installed in the pressure vessel 201. The reverse osmosis membrane element 202 includes a reverse osmosis membrane 2021. Although FIG. 1 shows one reverse osmosis membrane element 202 installed in the pressure vessel 201, the number of reverse osmosis membrane elements 202 installed in the pressure vessel 201 is plural. It does not matter.

  The second reverse osmosis membrane unit 200 sends the high-pressure concentrated water separated by the reverse osmosis membrane 2021 to the subsequent stage, and discharges the permeated water separated by the reverse osmosis membrane 2021. The concentrated water sent from the second reverse osmosis membrane unit 200 is supplied to the evaporative concentrator 500. In addition, the second reverse osmosis membrane unit 200 may form a concentrated liquid internal circulation. That is, a part of the concentrated water sent from the second reverse osmosis membrane unit 200 may be circulated and supplied to the second reverse osmosis membrane unit 200.

  The evaporative concentrator 500 is an example of a heat treatment apparatus that performs a heat treatment process on a concentrated liquid containing a water-soluble organic substance, and is, for example, an apparatus that performs evaporative concentration. The evaporative concentrator 500 evaporates water derived from the concentrated water supplied from the second reverse osmosis membrane unit 200 to generate evaporation residues and evaporated water. The evaporative concentrator 500 is realized by, for example, a configuration using an evaporator, a configuration using heating steam, a configuration using an existing system such as a spray dryer, or the like. As the evaporator, for example, a simple effect can and a multi-stage effect can may be used. Examples of the configuration using the heating steam include a configuration using a TVR (Thermo-Vapor Recompression) format, an MVR (Mechanical Vapor Recompression) format, and a heat pump. In addition, the evaporating concentrator 500 may have an additional configuration of a centrifugal separator and a solid-liquid separator according to generation of the evaporation residue. Further, a mechanism for adding a chemical solution such as an antifoaming agent and a scale inhibitor may be provided to promote evaporation and concentration.

Next, the operation of the water treatment apparatus 1 configured as described above will be described.
First, water to be treated containing a water-soluble organic substance is supplied to the remover 300. The water to be treated supplied to the remover 300 passes through the remover 300 and comes into contact with the adsorbent filled in the remover 300. Thereby, the organic matter dissolved in the water to be treated is adsorbed by the adsorbent. The water to be treated that has passed through the remover 300 is pressurized by the pressurizing pump 400-1 and supplied to the first reverse osmosis membrane unit 100.

  The water to be treated supplied to the first reverse osmosis membrane unit 100 is separated by the reverse osmosis membrane 1021 into permeated water and concentrated water. The concentrated water separated by the reverse osmosis membrane 1021 is pressurized by the pressure increasing pump 400-2 and supplied to the second reverse osmosis membrane unit 200. The permeated water separated by the reverse osmosis membrane 1021 is discharged.

  The concentrated water supplied to the second reverse osmosis membrane unit 200 is separated by the reverse osmosis membrane 2021 into permeated water and further concentrated water. The concentrated water separated by the reverse osmosis membrane 2021 is supplied to the evaporative concentrator 500. The permeated water separated by the reverse osmosis membrane 2021 is discharged.

  The concentrated water supplied to the evaporative concentrator 50 has its water content evaporated and is separated into evaporation residues and evaporated water.

  As described above, in the first embodiment, the remover 300 is provided before the first reverse osmosis membrane unit 100. Thus, of the solutes in the water to be treated, the introduction of the water-soluble organic substance into the first reverse osmosis membrane unit 100 is reduced, and the organic substance adheres to the reverse osmosis membrane 1021 and is derived from the water-soluble organic substance. The proliferation of microorganisms on the membrane surface based on the biodegradable components is suppressed. For this reason, the reverse osmosis membrane treatment is properly operated. In addition, when the slime inhibitor is added in the first reverse osmosis membrane unit 100, it is possible to suppress the waste of the chemical component due to the redox with the water-soluble organic substance in the water to be treated. Further, since the water-soluble organic matter introduced into the evaporative concentrator 500 is suppressed, foaming and the like caused by the aqueous organic matter in the evaporative concentrator 500 are suppressed, and an antifoaming agent composed of the water-soluble organic matter and scale The function of the chemical component of the inhibitor can be used appropriately.

  In the first embodiment, for example, an adsorbent that can regenerate a chemical solution is used as the adsorbent filled in the remover 300. Thus, for example, the running cost of the remover 300 can be reduced as compared with the case where the measure for the water-soluble organic substance is only the activated carbon adsorption tower.

  In FIG. 1, an example has been described in which the remover 300 is provided in a stage preceding the first reverse osmosis membrane unit 100. However, it is not limited to this. The remover 300 may be provided before the second reverse osmosis membrane unit 200 and / or before the evaporative concentrator 500.

  FIG. 3 is a block diagram illustrating another configuration example of the water treatment apparatus 1 illustrated in FIG. According to the water treatment apparatus 1 shown in FIG. 3, the remover 300-2 is provided before the second reverse osmosis membrane unit 200. The adsorbent filled in the remover 300-1 and the adsorbent filled in the remover 300-2 may be the same or different.

  In the water treatment apparatus 1 shown in FIG. 3, the concentrated water separated by the reverse osmosis membrane 1021 of the first reverse osmosis membrane unit 100 is supplied to the remover 300-2. The concentrated water supplied to the remover 300-2 passes through the remover 300-2, and comes into contact with the adsorbent filled in the remover 300-2. The concentrated water that has passed through the remover 300-2 is pressurized by the pressurizing pump 400-2 and supplied to the second reverse osmosis membrane unit 200. Thereby, the introduction of the water-soluble organic substance into the second reverse osmosis membrane unit 200 among the solutes in the water to be treated is further reduced.

  FIG. 4 is a block diagram illustrating another configuration example of the water treatment apparatus 1 illustrated in FIG. According to the water treatment apparatus 1 shown in FIG. 4, the remover 300-2 is provided before the second reverse osmosis membrane unit 200, and the remover 300-3 is provided before the evaporative concentrator 50. The adsorbents filled in the removers 300-1 to 300-3 may be the same or different.

  In the water treatment apparatus 1 shown in FIG. 4, the concentrated water separated by the reverse osmosis membrane 2021 of the second reverse osmosis membrane unit 200 is supplied to the remover 300-3. The concentrated water supplied to the remover 300-3 passes through the remover 300-3, and comes into contact with the adsorbent filled in the remover 300-3. The concentrated water that has passed through the remover 300-3 is supplied to the evaporative concentrator 50. Thereby, the water-soluble organic matter introduced into the evaporative concentrator 50 is further suppressed.

(Second embodiment)
In the second embodiment, a water treatment apparatus 1a provided with a path for supplying a regenerating liquid for regenerating an adsorbent to the remover 300 and a path for supplying cleaning water will be described.
FIG. 5 is a block diagram illustrating an example of a functional configuration of a water treatment device 1a according to the second embodiment. The water treatment apparatus 1a shown in FIG. 5 includes a first reverse osmosis membrane unit 100, a second reverse osmosis membrane unit 200, removers 300-1 to 300-3, booster pumps 400-1 and 400-2, an evaporative concentrator. 500, a regenerating solution tank 600, a regenerating solution introduction path 601, a first water pump 602, a washing water tank 700, a washing water introduction path 701, and a second water pump 702.

  The regenerating liquid tank 600 is a tank for storing a regenerating liquid. As the regenerating solution, for example, an aqueous solution of an alkali metal salt such as an aqueous sodium hydroxide solution and an aqueous potassium hydroxide solution is used. The regenerating liquid introduction path 601 is a path for introducing the regenerating liquid stored in the regenerating liquid tank 600 to the removers 300-1 to 300-3. The first water pump 602 sends the regenerating solution stored in the regenerating solution tank 600 to the regenerating solution introduction path 601.

  The cleaning water tank 700 is a tank for storing cleaning water. The cleaning water introduction path 701 is a path for introducing the cleaning water stored in the cleaning water tank 700 to the removers 300-1 to 300-3. The second water pump 702 sends out the washing water stored in the washing water tank 700 to the washing water introduction path 701.

  Next, an operation when the adsorbent of the removers 300-1 to 300-3 is regenerated in the water treatment apparatus 1a configured as described above will be described. The operation described here may be performed under the control of a control device (not shown) or may be performed under the control of an operator.

  For example, a water quality meter is arranged at the inlet and / or the outlet of the removers 300-1 to 300-3. If the measurement result of at least one of the water quality meters exceeds, for example, a predetermined threshold, the supply of the water to be treated to the remover 300-1 is stopped. When the supply of the water to be treated to the remover 300-1 is stopped, the first water pump 602 corresponding to the remover 300 whose measurement result has exceeded the threshold is driven. As a result, the regenerating solution stored in the regenerating solution tank 600 is supplied to the remover 300 whose measurement result has exceeded the threshold value via the regenerating solution introduction path 601. Inside the remover 300 to which the regenerating solution has been supplied, the organic matter adsorbed by the adsorbent is washed by the regenerating solution. The regenerating liquid supplied to the remover 300 is discharged from the waste liquid path.

  When the regenerating solution is discharged from the remover 300, the second water pump 702 corresponding to the remover 300 from which the regenerating solution has been discharged is driven. As a result, the washing water stored in the washing water tank 700 is supplied to the remover 300 from which the regenerating solution has been discharged via the washing water introduction path 701. Inside the remover 300 to which the cleaning water has been supplied, the alkaline component of the regenerating solution is cleaned by the cleaning water. The cleaning water supplied to the remover 300 is discharged from the waste liquid path. When the cleaning water is discharged from the remover 300, the regeneration process of the remover 300 ends, and the supply of the water to be treated to the remover 300-1 is restarted. In addition, the regeneration process of the adsorbent of the removers 300-1 to 300-3 may be performed at the same time.

  As described above, in the second embodiment, the water treatment device 1a includes the regenerating solution tank 600 for supplying the regenerating solution to the remover 300, the regenerating solution introduction path 601, the first water pump 602, and the cleaning water. A cleaning water tank 700 for supplying water, a cleaning water introduction path 701, and a second water pump 702. This makes it possible to collectively manage the removers that need to be regenerated.

  The water treatment apparatus 1a shown in FIG. 5 is different from the water treatment apparatus 1 in FIG. 4 in that a regenerating liquid tank 600, a regenerating liquid introduction path 601, a first water pump 602, a washing water tank 700, a washing water introduction path 701, And a second water supply pump 702. The water treatment device 1a according to the second embodiment is not limited to this configuration. For example, a regenerating solution tank 600, a regenerating solution introduction path 601, a first water supply pump 602, a cleaning water tank 700, a cleaning water introduction path 701, and a second water supply pump 702 are added to the water treatment apparatus 1 of FIGS. May be adopted.

  Further, in the second embodiment, an example is given in which the water treatment apparatus 1a independently includes a regenerating liquid introduction path 601 for supplying a regenerating liquid and a cleaning water introduction path 701 for supplying cleaning water. explained. However, it is not limited to this. In the water treatment apparatus 1a, the regenerating liquid introduction path 601 and the cleaning water introduction path 701 may be shared.

  In the second embodiment, the case where the water treatment apparatus 1a has one remover 300-1 to 300-3 has been described as an example. However, it is not limited to this. A plurality of removers 300-1 to 300-3 may be provided. FIG. 6 is a block diagram illustrating an example of another functional configuration of the water treatment apparatus 1a illustrated in FIG. In the water treatment apparatus 1a shown in FIG. 6, the removers 301-1 to 301-3 are provided in parallel with the removers 300-1 to 300-3, respectively. Note that the removers 301-1 to 301-3 may take the merry-go-round format with the removers 300-1 to 300-3, respectively.

  FIG. 6 shows a case where the water to be treated is supplied to the removers 300-1 to 300-3 from the previous stage, and the regenerating solution and the cleaning water are supplied to the removers 301-1 to 301-3 in a standby state. I have. In FIG. 6, for simplification of the drawing, the regenerating liquid introduction path 601 and the cleaning water introduction path 701 connected to the removers 300-1 to 300-3 are not shown.

  In the water treatment apparatus 1a configured as shown in FIG. 6, the operation when the adsorbents of the removers 300-1 to 300-3 and 301-1 to 301-3 are regenerated is, for example, as follows. That is, for example, when the water quality meter of the remover 300-1 passing the water to be treated measures an abnormal value, the water to be treated is led out to the remover 301-1 by operating a valve or the like. Thereby, the supply of the water to be treated to the remover 300-1 is stopped, and the treated water passes through the remover 301-1. Then, the regenerating solution and the washing water are supplied to the remover 300-1 in which the supply of the water to be treated is stopped, and the adsorbent is regenerated. When there are a plurality of the removers 300 in which the supply of the water to be treated is stopped, the regeneration process of the adsorbent of the plurality of stopped removers 300 may be performed simultaneously.

  As described above, by providing a plurality of removers, it is possible to perform the regeneration treatment on the adsorbent of the other remover while adsorbing organic matter in the water to be treated by one remover. That is, it is possible to perform the regeneration treatment of the adsorbent of the remover without stopping the supply of the water to be treated.

  Further, the configuration of the water treatment apparatus 1a according to the second embodiment is not limited to FIGS. For example, a heat introduction path may be provided from the evaporator 500 to the removers 300-1 to 300-3, 301-1 to 301-3. FIG. 7 is a block diagram illustrating an example of another functional configuration of the water treatment apparatus 1a illustrated in FIG. The water treatment apparatus 1a shown in FIG. 7 is provided with a heat introduction path 501 and a third water supply pump 502. In FIG. 7, the heat introduction path 501 connected to the removers 300-1 to 300-3 is not shown for simplification of the drawing.

  The heat introduction path 501 is a path for introducing water for cooling the evaporator 500 to the removers 300-1 to 300-3, 301-1 to 301-3. The third water supply pump 502 sends out water heated by the exhaust heat of the evaporator 500 to the heat introduction path 501.

  The third water pump 502 sends out water to the heat introduction path 501 at a predetermined timing. The predetermined timing is, for example, when the path is switched to the lead-out to the other remover, when the first water supply pump 602 sends out the regenerating liquid to the regenerating liquid introduction path 601, and when the second water supply pump 702 uses the washing water. Is sent to the washing water introduction path 701, and when the temperature of the water heated by the exhaust heat of the evaporator 500 exceeds a predetermined value.

  The adsorbent filled in the removers 300-1 to 300-3 and 301-1 to 301-3 depends on the size of the water-soluble organic components and organic substances in the water to be treated, and whether or not the cleaning effect is improved by the heating operation. It will be selected accordingly.

  As described above, by raising the temperature of the water supplied to the remover using the exhaust heat from the evaporative concentrator 500, it is possible to save energy for raising the temperature of the water. Further, by promoting the regeneration process of the adsorbent with the heated water, it is possible to suppress the consumption of the reagent such as the regenerating liquid.

  Note that FIG. 7 shows an example in which water warmed by the exhaust heat of the evaporator 500 is introduced into the removers 300-1 to 300-3 and 301-1 to 301-3 via the heat introduction path 501. explained. However, it is not limited to this. The exhaust heat of the evaporator 500 may be used to raise the temperature of the regenerating solution and / or the washing water.

  Further, for example, the drainage path of the first reverse osmosis membrane unit 100 may be connected to the regenerating liquid tank 600, the washing water tank 700, and the heat introduction path 501. FIG. 8 is a block diagram illustrating an example of another functional configuration of the water treatment apparatus 1a illustrated in FIG. The water treatment apparatus 1a shown in FIG. 8 is provided with a water supply path 103 and a fourth water supply pump 104.

  The water supply path 103 is a path for supplying permeated water separated and discharged by the reverse osmosis membrane 1021 of the first reverse osmosis membrane unit 100 to the regenerating liquid tank 600, the washing water tank 700, and the heat introduction path 501. It is. The fourth water supply pump 104 sends out the permeated water discharged from the first reverse osmosis membrane unit 100 to the water supply path 103.

  In this way, by supplying the permeated water discharged from the first reverse osmosis membrane unit 100 to the regenerating liquid tank 600 and the washing water tank 700, for example, the regenerating liquid and the washing water are generated using the permeated water. It is possible to do. In addition, by supplying the permeated water discharged from the first reverse osmosis membrane unit 100 to the heat introduction path 501, for example, the heat medium in the heat introduction path 501 can be covered using the permeated water. . This makes it possible to reduce the amount of water supplied to the water treatment device 1a.

  Further, for example, the drainage paths of the removers 300-1 and 301-1 may be connected to the removers 300-3 and 301-3. FIG. 9 is a block diagram illustrating an example of another functional configuration of the water treatment apparatus 1a illustrated in FIG. The water treatment apparatus 1a shown in FIG. 9 is provided with a second regenerating liquid introduction path 603 and a fifth water supply pump 604.

  The second regenerating liquid introduction path 603 is a path for introducing the regenerating liquid discharged from the removers 300-1 and 301-1 to the removers 300-3 and 301-3. The fifth water supply pump 604 sends the regenerated liquid discharged from the removers 300-1 and 301-1 to the second regenerated liquid introduction path 603.

  In the water treatment apparatus 1a configured as shown in FIG. 9, the operation when the adsorbent of the removers 300-3 and 301-3 is regenerated is, for example, as follows. For example, it is assumed that the water to be treated is supplied to the removers 300-1 to 300-3, and the removers 301-1 to 301-3 are in a standby state. At this time, the regeneration process of the adsorbent of the removers 301-1 to 301-3 is started, for example, triggered by an instruction from the operator or reaching a predetermined time.

  When the regeneration process is started, the first water pumps 602-1 and 602-2 and the fifth water pump 604 corresponding to the removers 301-1 and 301-2 are driven. When the first water pumps 602-1 and 602-2 are driven, the regenerating solution stored in the regenerating solution tank 600 is supplied to the remover 301-1 via the regenerating solution introduction path 601-1. It is supplied to the remover 301-2 via the regenerating solution introduction path 601-2. Inside the removers 301-1 and 301-2 to which the regenerating solution has been supplied, the organic matter adsorbed by the adsorbent is washed by the regenerating solution. The regenerated liquid supplied to the removers 301-1 and 301-2 is discharged from a waste liquid path.

  When the fifth water supply pump 604 is driven, the regenerating liquid discharged from the remover 301-1 is supplied to the remover 301-3 via the second regenerating liquid introduction path 603. Organic substances adsorbed by the adsorbent are washed inside the remover 301-3 to which the recycled liquid has been supplied.

  When a preset time has elapsed since the fifth water pump 604 was driven, the fifth water pump 604 is stopped, and the first water pump 602-3 is driven. When the first water pump 602-3 is driven, the regenerating liquid stored in the regenerating liquid tank 600 is supplied to the remover 301-3 via the regenerating liquid introduction path 601-3. Inside the remover 301-3 to which the regenerating liquid has been supplied, the organic matter adsorbed by the adsorbent is washed by the regenerating liquid.

  Thus, the removers 300-3 and 301-3 are first washed with the regenerating liquid discharged from the removers 300-1 and 301-1. Then, thereafter, the removers 300-3 and 301-3 are washed with the regenerating liquid stored in the regenerating liquid tank 600. The adsorbent of the removers 300-3 and 301-3 used in the subsequent stage may have less organic substances adsorbed than the adsorbent of the removers 300-1 and 301-1 used in the preceding stage. The water treatment apparatus 1a according to the second embodiment supplies the regenerating liquid while regenerating the adsorbent of the removers 300-1, 300-2, 300-3, 301-1, 301-2, 301-3. The amount can be reduced.

(Third embodiment)
In the third embodiment, a water treatment apparatus 1b for treating organic matter in regenerated wastewater discharged from the removers 300-1, 300-2, 300-3, 301-1, 301-2, 301-3 will be described. I do.
FIG. 10 is a block diagram illustrating an example of a functional configuration of a water treatment device 1b according to the third embodiment. The water treatment apparatus 1b shown in FIG. 10 includes a first reverse osmosis membrane unit 100, a second reverse osmosis membrane unit 200, removers 300-1 to 300-3, 301-1 to 301-3, and a booster pump 400-1. , 400-2, evaporating concentrator 500, regenerating solution tank 600, regenerating solution introduction path 601, first water supply pump 602, washing water tank 700, washing water introduction path 701, second water supply pump 702, heat introduction path 501, 3 includes a water supply pump 502, a regeneration waste liquid introduction path 302, a sixth water supply pump 303, an oxidation treatment tank 801, a coagulation treatment tank 802, and a biological treatment tank 803.

  The regeneration waste liquid introduction path 302 is a path for introducing the regeneration liquid discharged from the removers 300-1 to 300-3 and 301-1 to 301-3 and the regeneration waste liquid such as washing water into the oxidation treatment tank 801. . The sixth water pump 303 sends the regenerated waste liquid discharged from the removers 300-1 to 300-3, 301-1 to 301-3 to the regenerated waste liquid introduction path 302.

  The oxidation treatment tank 801 is a tank for oxidizing water-soluble organic substances derived from the waste liquid for regeneration. The oxidation treatment tank 801 is realized using, for example, an ozone method, a Fenton method, an ozone-hydrogen peroxide method, a UV (Ultra Violet) method, a chlorine method, a chlorine electrolysis method, and a method combining these oxidation means. . The regeneration waste liquid supplied from the removers 300-1 to 300-3 and 301-1 to 301-3 via the regeneration waste liquid introduction path 302 is oxidized in the oxidation treatment tank 801 to remove water-soluble organic substances contained in the regeneration waste liquid. For example, it is made hydrophilic and / or low molecular weight.

  The coagulation tank 802 is a tank for coagulating and sedimenting water-soluble organic substances derived from the regeneration waste liquid and then removing the same. In the coagulation tank 802, for example, an inorganic coagulant containing an iron salt or an aluminum salt, or a polymer coagulant is added. When adding a polymer flocculant, a pH adjuster or a flocculant may be added. The flocculation treatment tank 802 includes, for example, a flocculation tank for flocculating organic substances to form flocs, and a sedimentation tank for removing flocs flocculated and settled. The coagulation tank and the precipitation tank may be provided in multiple stages. The aggregating tank may be provided with a stirring mechanism for efficiently forming flocs. Among the water-soluble organic substances contained in the regeneration waste liquid sent out from the oxidation treatment tank 801, components having a flocculant adsorption / coprecipitation action are removed in the flocculation treatment tank 802.

  Note that the aggregation treatment tank 802 may be provided with an introduction path for carbon dioxide gas and / or a carbonate ion component. This makes it possible to remove the precipitate of the hardness component and the precipitate of the silica component in the liquid in the coagulation treatment tank 802, and to reduce the hardness component and the silica component in the liquid. .

  The biological treatment tank 803 is a tank for decomposing and removing water-soluble organic substances derived from the regeneration waste liquid. The biological treatment tank 803 has, for example, an aerobic tank and / or an anaerobic tank. Further, the biological treatment tank 803 may apply a biological carrier method, a bioreactor method, a membrane separation method, or the like according to an organic substance load. The residual components not removed in the oxidation treatment tank 801 and the coagulation treatment tank 802 are decomposed and removed by the biological treatment in the biological treatment tank 803.

  In addition, in FIG. 10, the case where the water treatment apparatus 1b includes the oxidation treatment tank 801, the coagulation treatment tank 802, and the biological treatment tank 803 has been described as an example, but the invention is not limited to this. The water treatment apparatus 1b may include at least two of the oxidation treatment tank 801, the coagulation treatment tank 802, and the biological treatment tank 803.

  As described above, in the third embodiment, at least two types of the regeneration waste liquid treatment tanks such as the oxidation treatment tank 801, the coagulation treatment tank 802, and the biological treatment tank 803 are provided. The regeneration waste liquid discharged from the remover 300 is treated. This makes it possible to treat the regenerated waste liquid with two or more different processing means, so that the organic matter in the regenerated waste liquid can be appropriately treated.

  The water treatment apparatus 1b shown in FIG. 10 is different from the water treatment apparatus 1a in FIG. 7 in that the regeneration waste liquid introduction path 302, the sixth water supply pump 303, the oxidation treatment tank 801, the coagulation treatment tank 802, and the biological treatment tank 803 are provided. It has an added configuration. The water treatment device 1b according to the third embodiment is not limited to this configuration. For example, in the water treatment apparatus 1 of FIGS. 1 to 4 and the water treatment apparatus 1a of FIGS. 5, 6, 8, and 9, the recycled waste liquid introduction path 302, the sixth water supply pump 303, the oxidation treatment tank 801, A configuration in which a coagulation treatment tank 802 and a biological treatment tank 803 are added may be employed.

  Further, the configuration of the water treatment device 1b according to the third embodiment is not limited to FIG. For example, the water treatment apparatus 1b may take the treated water obtained by treating the regeneration waste liquid as the water to be treated into the removers 300-1 to 300-3 or the removers 301-1 to 301-3. FIG. 11 is a block diagram illustrating an example of another functional configuration of the water treatment apparatus 1b illustrated in FIG. The water treatment apparatus 1b shown in FIG. 11 further includes an introduction path 804 for introducing supply water to the coagulation treatment tank 802, a membrane treatment apparatus 805, a water softener 806, and a deaerator 807. The membrane processing device 805, the water softener 806, and the deaerator 807 are provided at a stage subsequent to the biological treatment tank 803.

  The supply water introduced through the introduction path 804 is confused with the oxidized regenerated wastewater in the coagulation tank 802, and is combined and treated in the coagulation tank 802. The treated water treated in the coagulation treatment tank 802 is further treated in the biological treatment tank 803, the membrane treatment device 805, the water softener 806, and the deaerator 807, and as the water to be treated, the remover 300-1 or the remover 301. -1.

  The membrane treatment device 805 filters the treated water treated in the biological treatment tank 803. The membrane processing apparatus 805 is realized using a membrane separation technique such as a microfiltration (MF) membrane, an ultrafiltration (UF) membrane, and an MBR (Membrane Bioreactor) method. When the membrane separation activated sludge method or the like is introduced in the biological treatment tank 803, at least a part of the membrane treatment device 805 may be included in the biological treatment tank 803.

  The water softener 806 replaces the hardness component contained in the filtered water filtered by the membrane processing device 805 with sodium ions to produce soft water. The water softener 806 is realized using, for example, a cation exchange resin. The cation exchange resin is composed of, for example, a strongly acidic cation exchange resin, a weakly acidic cation exchange resin, or a combination thereof. It is desirable that at least one or more of the processing systems of the water softener 806 be realized using a macroporous resin. By using a macroporous resin, it is possible to adsorb an organic substance by a part of the pores of the macroporous resin.

  The deaerator 807 removes the dissolved carbonic acid component in the liquid softened by the water softener 806. The deaerator 807 is selected, for example, from a means capable of separating the dissolved carbonic acid component in the softened liquid. For example, the deaerator 807 is realized using an air diffusion tower, a gas separation membrane, and the like. The liquid from which the dissolved carbonic acid component has been removed by the deaerator 807 is supplied to the remover 300-1 or 301-1 as water to be treated.

As described above, the supply water supplied through the introduction path 804 and the oxidized regenerated wastewater are combined and treated in the coagulation treatment tank 802. Therefore, in the flocculation treatment tank 802, the alkaline precipitation component contained in the supply water supplied via the introduction path 804 is mixed with the oxidized water of the regeneration waste liquid derived from the alkaline chemical. That is, the alkaline precipitation component can be used as an alkaline agent.
Further, organic matter derived from the supply water is treated in the biological treatment tank 803. When only the regeneration waste liquid oxidized in the oxidation treatment tank 801 is supplied to the biological treatment tank 803, the biological treatment tank 803 must cope with the load fluctuation of the biological treatment according to the generation frequency of the regeneration waste liquid. By treating the organic matter derived from the supplied water in the biological treatment tank 803, the load fluctuation of the biological treatment is reduced, and the management of the biological treatment tank 803 is facilitated.

  The supply water introduced through the introduction path 804 and the oxidized regenerated wastewater are supplied to the water to be treated via the coagulation treatment tank 802, the biological treatment tank 803, the membrane treatment device 805, the water softener 806, and the deaerator 807. Is supplied to the remover 300-1 or the remover 301-1 to remove the remaining organic matter. Thereby, the components causing the scale in the reverse osmosis membrane are removed in advance, and the removers 300-1 to 300-3, 301-1 to 301- are appropriately operated while performing the evaporative concentration treatment of the water to be treated. 3 can streamline the purification process. In addition, the chemicals used in the first and second reverse osmosis membrane units 100 and 200 and the evaporator 500 can be effectively used.

  In FIG. 11, a pretreatment device of a membrane treatment device 805, a water softener 806, and a deaerator 807 is provided, and solid components, a hardness component, and a carbonate component are removed to the removers 300-1 and 301-1. The example which supplies the to-be-processed water which performed pre-processing is shown. However, the devices provided before the removers 300-1 and 301-1 are not limited to these. Any of the membrane processing device 805, the water softener 806, and the deaerator 807 may not be provided, or another device may be provided. In addition, the membrane processing device 805 is provided before the removers 300-1 and 301-1, and the water softener 806 and the deaerator 807 are provided after the removers 300-1 and 301-1. I do not care.

  FIG. 12 is a block diagram illustrating an example of another functional configuration of the water treatment apparatus 1b illustrated in FIG. In the water treatment apparatus 1b shown in FIG. 12, a water softener 806a and a deaerator 807a are provided at a stage subsequent to the removers 300-1 and 301-1. As shown in FIG. 12, by disposing a water softener 806a and a deaerator 807a at a stage subsequent to the removers 300-1 and 301-1 to prevent organic substances from adhering to the ion exchange resin filled in the water softener 806a. It becomes possible to suppress. Further, when the liquid passed through the water softener 806a and the deaerator 807a is introduced into the first reverse osmosis membrane unit 100, since the membrane scale component in a high pH environment is reduced, the reverse osmosis membrane is neutralized. It is also possible to operate in the above environment.

  According to at least one embodiment described above, the water treatment apparatuses 1, 1a, and 1b can suppress the transfer of the water-soluble organic matter to the concentrated water to be subjected to the evaporative concentration treatment. In addition, since the load of organic substances on the water to be treated in the reverse osmosis membrane treatment and the evaporative concentration treatment can be reduced, the operation of concentrating the water to be treated is appropriately operated, and waste of the used chemical can be reduced.

  Although several embodiments of the present invention have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, replacements, changes, and combinations can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and equivalents thereof.

1, 1a, 1b Water treatment device 50 Evaporator 100 First reverse osmosis membrane unit 101 Pressure vessel 102 Reverse osmosis membrane element 1021 Reverse osmosis membrane 103 Water supply path 104 Fourth water pump 200 Second reverse osmosis membrane unit 201 pressure vessel 202 reverse osmosis membrane element 2021 reverse osmosis membrane 300, 300-1 to 300-4 remover 3001 bypass path 301-1 to 301-3 remover 302 regeneration Waste liquid introduction path 303 sixth water supply pump 400-1, 400-2 booster pump 500 evaporative concentrator 501 heat introduction path 502 third water supply pump 600 regenerating liquid tanks 601, 601-1 to 601-3 Regenerating liquid introduction path 602, 602-1 to 602-3: first water supply pump 603 ... regenerating liquid introduction path 604 ... fifth water supply pump 700 ... washing water tank 70 ... washing water introduction path 702 ... second water pump 801 ... oxidation treatment tank 802 ... flocculation process tank 803 ... biological treatment tank 804 ... introduction path 805 ... film processing apparatus 806,806A ... water softener 807,807A ... deaerator

Claims (11)

A remover that is filled with a regenerable adsorbent and removes organic matter in the water to be treated that is adsorbed and removed by the adsorbent,
A first reverse osmosis membrane unit that separates the water to be treated that has passed through the remover into a first concentrated water and a first permeate by a reverse osmosis membrane;
A second reverse osmosis membrane unit that separates the first concentrated water separated by the first reverse osmosis membrane unit into a second concentrated water and a second permeate by a reverse osmosis membrane;
A water treatment device comprising: a heat treatment device that performs a heat treatment on the second concentrated water separated by the second reverse osmosis membrane unit to evaporate water contained in the second concentrated water. The remover is also provided in a stage preceding the second reverse osmosis membrane unit,
The water treatment device according to claim 1, wherein the second reverse osmosis membrane unit separates the first concentrated water that has passed through the remover provided in the preceding stage by a reverse osmosis membrane. The remover is also provided before the heat treatment apparatus,
The water treatment device according to claim 1, wherein the heat treatment device performs a heat treatment on the second concentrated water that has passed through the remover provided in the preceding stage.   The water treatment apparatus according to any one of claims 1 to 3, further comprising a path for supplying a regenerating solution and cleaning water to the remover.   The water treatment apparatus according to claim 4, wherein heat generated in the heat treatment apparatus is used for regeneration of the adsorbent of the remover.   The water treatment apparatus according to claim 4, wherein the first permeated water is used for generating the regenerating liquid and the washing water. A path for supplying a liquid heated by heat generated in the heat treatment apparatus to the remover,
The water treatment device according to claim 5, wherein the first permeated water is used as the liquid.   A path for supplying a regenerating solution supplied to a remover provided upstream of the first reverse osmosis membrane unit and a regenerated waste liquid discharged from washing water to a remover provided upstream of the heat treatment apparatus. Item 8. A water treatment apparatus according to any one of Items 4 to 7.   The water treatment according to any one of claims 4 to 8, further comprising a treatment tank for performing at least two types of water treatment on the regeneration solution supplied to the remover and the regeneration waste solution from which the washing water is discharged. apparatus. An oxidation treatment tank that performs an oxidation treatment on the regeneration liquid supplied to the remover and the regeneration waste liquid from which the cleaning water is discharged,
The oxidized regeneration wastewater, the coagulation treatment tank that performs the coagulation treatment by mixing the supplied water,
A biological treatment tank that performs biological treatment on the water after the coagulation treatment,
Before the biologically treated water is subjected to a pretreatment for removing at least a solid content, and before the water after the pretreatment is sent to the remover provided before the first reverse osmosis membrane unit as the water to be treated. The water treatment apparatus according to any one of claims 4 to 8, further comprising a treatment apparatus. An oxidation treatment tank that performs an oxidation treatment on the regeneration liquid supplied to the remover and the regeneration waste liquid from which the cleaning water is discharged,
The oxidized regeneration wastewater, the coagulation treatment tank that performs the coagulation treatment by mixing the supplied water,
A biological treatment tank that performs biological treatment on the water after the coagulation treatment,
A pretreatment for subjecting the water after the biological treatment to a pretreatment for removing a solid content, and sending the water after the pretreatment to the remover provided at a stage preceding the first reverse osmosis membrane unit as the water to be treated; Equipment and
A water softener that removes a hardness component from the water to be treated that has passed through a remover provided in a stage preceding the first reverse osmosis membrane unit;
The water treatment apparatus according to any one of claims 4 to 8, further comprising a deaerator for removing a carbonic acid component from the water to be treated from which the hardness component has been removed.