JP2011092805A - Filter, water treatment apparatus using the same, and method for controlling the water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter capable of enhancing filtration capacity, a water treatment apparatus using the same, and a method for controlling the water treatment apparatus. <P>SOLUTION: The filter 1 is equipped with filter membrane materials 2 and 3 for making raw water to pass through to filter the same. By charging the membrane surfaces 2a and 3a of the filter membrane materials 2 and 3 by a charging means 5, an ionic component can be removed along with the contaminant component in raw water when the raw water is made to pass through the filter membrane materials 2 and 3 to be filtered. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a filtration device, a water treatment device using the filtration device, and a control method for the water treatment device.

  Conventionally, as a filtering device, an anode and a cathode are arranged with a filtering membrane in between, and a voltage is applied to the anode and cathode to electrochemically remove deposits on the surface of the filtering membrane, thereby regenerating the filtering membrane. What was made to perform is known (for example, refer patent document 1).

JP 2002-18436 A

  However, such a conventional filtration device can regenerate the filtration membrane, but cannot remove the ionic component in the raw water during filtration. In other words, the conventional filtration apparatus cannot improve the filtration performance.

  Then, an object of this invention is to obtain the filtration apparatus which can improve filtration performance, the water treatment apparatus using the filtration apparatus, and the control method of the water treatment apparatus.

  The invention according to claim 1 is a filtration apparatus including a filtration membrane material that passes and filters raw water, and is characterized by comprising charging means for charging the membrane surface of the filtration membrane material.

  In the invention of claim 2, in the filtration device according to claim 1, the filtration membrane material is formed in a bag shape, and a permeated water side spacer is disposed inside the filtration membrane material, The permeated water side spacer is formed of a conductive material in a mesh shape.

  According to a third aspect of the present invention, in the filtration device according to the first or second aspect, the filtration membrane material has a conductive function.

  According to a fourth aspect of the present invention, in the filtration device according to the second or third aspect, the filtration device has the permeated water side spacer disposed inside the filtration membrane material and the filtration membrane material. The water supply side spacer is arranged on the outside, and is formed by winding around the water collection pipe in a state where the open end of the bag-shaped filtration membrane material is fixed so as to communicate with the inside of the water collection pipe. It is characterized by that.

  In invention of Claim 5, the water treatment apparatus uses the filtration apparatus of any one of Claims 1-4, It is characterized by the above-mentioned.

  In the water treatment apparatus according to claim 6, in the water treatment apparatus according to claim 5, a raw water inlet that has a housing that covers the outside of the filtration device in a water-tight manner, and supplies the raw water to the filtration device in the housing. And a purified water discharge port for discharging the purified water filtered by the filtration device, and a seal portion for partitioning the raw water inlet and the purified water discharge port in a watertight manner.

  The invention according to claim 7 is the method for controlling a water treatment apparatus according to claim 6, wherein the water treatment apparatus includes a supply pump for supplying raw water into the housing, and a raw water inlet of the housing. A first on-off valve that opens and closes, and a second on-off valve for drainage that discharges water in the housing, and the housing is arranged such that the water purification outlet side of the housing is on the upper side During the filtration operation of the water treatment device, the first on-off valve is opened and the second on-off valve is closed, and the membrane surface of the filtration membrane material is charged positively or negatively, while during the washing operation, The raw water supply pump is stopped, the first on-off valve is closed, the membrane surface of the filter membrane material is charged opposite to that during the filtration operation, and then the second on-off valve is opened. To do.

  According to the invention of claim 1, since the membrane surface of the filtration membrane material can be charged by the charging means, the ionic components in the raw water can be removed when the raw water is filtered through the filtration membrane material. become able to. That is, according to the invention of claim 1, it is possible to obtain a filtration device capable of improving the filtration performance.

  According to the invention of claim 2, the filtration membrane material is formed in a bag shape, and the mesh-like permeated water side spacer is disposed inside the filtration membrane material, thereby being filtered through the filtration membrane material. The purified water can easily move inside the filtration membrane material. That is, it becomes possible to spread purified water over the entire inside of the filtration membrane material. Here, if the permeated water side spacer is formed of a conductive material and the permeated water side spacer is energized, the entire filtration membrane material can be energized through the purified water. Thus, according to the invention of claim 2, almost the entire surface of the filtration membrane material can be charged, and the filtration performance can be further improved.

  According to the invention of claim 3, since the filtration membrane material has a conductive function, the membrane surface of the filtration membrane material can be more reliably charged, and the filtration performance can be further improved. Is possible.

  According to the fourth aspect of the present invention, the filtration device includes a permeated water side spacer disposed inside the filtration membrane material and a water supply side spacer disposed outside the filtration membrane material. Since it is formed by winding around the water collection pipe in a state where the open end is fixed so as to communicate with the inside of the water collection pipe, it is possible to reduce the size of the filtration device without reducing the effective filtration area of the filter membrane material. it can.

  According to invention of Claim 5, since the water treatment apparatus uses the filtration apparatus of any one of Claims 1-4, the water treatment apparatus which can improve filtration performance is obtained. Can do.

  According to the invention of claim 6, since the outside of the filtration device is covered with the housing having the raw water inlet and the purified water discharge port, the filtration device can be used as a cartridge, and the filtration device can be easily replaced. be able to.

  According to the invention of claim 7, during the filtration operation, the first on-off valve for opening and closing the raw water inlet is opened, the second on-off valve for draining the water in the housing is closed, and the filter membrane material By charging the membrane surface positively or negatively, it is possible to purify the water by removing ions together with the dirt components in the raw water, and the purified water can be discharged from the purified water discharge port. On the other hand, during the washing operation, the raw water supply pump is stopped, the first on-off valve is closed, and the membrane surface of the filtration membrane material is charged oppositely to that during the filtration operation, so that the ions adhered to the filtration membrane material The components can be separated electrochemically. After that, when the second on-off valve is opened, the housing is disposed so that the purified water discharge port side is on the upper side, so that the water in the housing is drained through the second on-off valve by the head pressure. At this time, the ion component separated from the filtration membrane material together with the dirt component adhering to the filtration membrane material is also drained through the second on-off valve. Thus, according to the invention of claim 7, the filtration device can be efficiently washed, and the regeneration efficiency of the filtration membrane material can be increased.

FIG. 1 is a perspective view schematically showing a state in which a filter membrane material of a filtration device according to an embodiment of the present invention is developed. FIG. 2 is a perspective view in which a part of the filtration device according to the embodiment of the present invention is broken and developed. FIG. 3 is a perspective view showing the assembly procedure of the main part of the filtration device according to the embodiment of the present invention in order from (a) to (c). FIG. 4 is a cross-sectional view schematically showing a water treatment device configured using the filtration device according to one embodiment of the present invention. FIG. 5 is a cross-sectional view schematically showing a filtration operation of the water treatment device shown in FIG. FIG. 6 is a cross-sectional view schematically showing the water treatment device shown in FIG. 4 during a cleaning operation.

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

  As shown in FIG. 1, the filtration device 1 according to the present embodiment includes filtration membrane sheets (filtration membrane materials) 2 and 3 formed in a bag shape by joining the peripheral portions 2E and 3E, and the filtration membrane sheets 2. 3 between the opposing surfaces of 3 (inside the bag-shaped filtration membrane sheet) so as to be sandwiched across almost the entire surface of these filtration membrane sheets 2 and 3, and a conductive mesh sheet (permeation) A water-side spacer) 4, and a voltage application unit (charging means) 5 that charges the membrane surfaces 2 a and 3 a of the filtration membrane sheets 2 and 3 through the conductive mesh sheet 4.

  The filtration membrane sheets 2 and 3 are formed of a membrane material having a filtration function, and the raw water is filtered by passing the raw water from the outside to the inside of the bag-shaped filtration membrane sheets 2 and 3. It has become so. In the present embodiment, a structure in which the conductive mesh sheet 4 is sandwiched between the filtration membrane sheets 2 and 3 is referred to as a membrane leaf 6.

  The filtration membrane sheets 2 and 3 are formed by cutting a membrane material having a filtration function into a desired size, and the membrane leaf 6 sandwiches the conductive mesh sheet 4 between the filtration membrane sheets 2 and 3. In this state, the peripheral edges 2E and 3E are formed by bonding with an adhesive, sewing or heat fusion. Therefore, the conductive mesh sheet 4 is formed to be smaller than the filtration membrane sheets 2 and 3 by the joining allowance.

  As the electroconductive mesh sheet 4, what was formed by knitting electroconductive materials, such as fibrous activated carbon, a metal wire, and an electroconductive resin wire, in the shape of a mesh can be used. In this way, by using the mesh-like conductive mesh sheet 4, the water flowing inward through the filtration membrane sheets 2 and 3 formed in the bag shape is filtered through the conductive mesh sheet 4. The inside of the membrane sheets 2 and 3 can be easily moved.

  The voltage application unit 5 includes a power source 51 having a function of switching between plus and minus (not shown), and, as will be described later, between the raw water supply port 10a side and the purified water discharge port 7c side of the filtration device 1. By generating a potential difference, the membrane surfaces 2a and 3a of the filtration membrane sheets 2 and 3 are charged. At this time, when the membrane surfaces 2a and 3a are positively charged, when the raw water is filtered through the filtration membrane sheets 2 and 3, the positive ion components in the raw water are repelled by the membrane surfaces 2a and 3a. The positive ion component in the raw water is prevented from passing through the filtration membrane sheets 2 and 3, and the negative ion component in the raw water is removed by attaching the negative ion component to the membrane surfaces 2a and 3a. It can be removed. Conversely, when the membrane surfaces 2a and 3a of the filtration membrane sheets 2 and 3 are negatively charged, it becomes possible to repel negative ions in the raw water and attach positive ion components.

  Thus, as shown in FIG. 1, the filtration device 1 in which the conductive mesh sheet 4 is sandwiched between the filtration membrane sheets 2 and 3 to form the membrane leaf 6 has one side (open side end 6a) of the membrane leaf 6. The membrane 6 is attached to the water collecting pipe 7 so that the opening 6 b communicates with the inside of the hollow water collecting pipe 7. . Although a detailed connection structure between the opening 6b and the water collecting pipe 7 will be described later, the water collecting pipe 7 is formed with an opening 71 (a through hole in this embodiment) such as a slit or a through hole. 6b communicates with water tightly. The purified water in the membrane leaf 6 flows into the water collecting pipe 7 through the opening 6b and the opening 71 and is collected, and is supplied to the outside of the filtration device 1 through the water collecting pipe 7. .

  In the present embodiment, the filtration device 1 is formed in a substantially cylindrical shape by winding the membrane leaf 6 around the water collection pipe 7. Specifically, a plurality of membrane leaves 6 formed in a bag shape are bonded and fixed to a water collecting pipe 7, and mesh-shaped water supply side spacers 8 are respectively disposed between the membrane leaves 6 adjacent to each other. The membrane leaf 6 is wound around the water collecting pipe 7 with the water supply side spacer 8 disposed outside, and the entire outermost periphery is covered with a waterproof membrane 9 in a watertight manner, so that the filtration device 1 is formed into a substantially cylindrical shape. Forming.

  Here, based on FIG. 3, the outline of the manufacturing method of the membrane leaf 6 is demonstrated. 3A to 3C show a process of winding the membrane leaf 6, the conductive mesh sheet 4, and the water supply side spacer 8 around the water collection pipe 7.

  First, as shown in FIG. 3 (a), a collection of the two filtration membrane sheets 2 and 3 in a state where the conductive mesh sheet 4 is sandwiched between the two filtration membrane sheets 2 and 3 formed in a band shape. The peripheral edges 2E and 3E on the three sides excluding the water pipe 7 side are bonded together in a bag shape with the adhesive B, and as shown in FIG. 3 (b), the two filtration membrane sheets 2 and 3 and the conductive mesh sheet 4 is pressed. In this way, the membrane leaf 6 is formed. At this time, in order to ensure insulation, the conductive mesh sheet 4 is made slightly smaller than the dimensions of the filtration membrane sheets 2 and 3 so that the conductive mesh sheet 4 does not protrude from the end of the membrane leaf 6. Is desirable.

  On the other hand, as shown in FIG. 3 (a), on the outer periphery of the water collecting pipe 7, an opening (through hole) 71 that collects the opening 6 b of the membrane leaf 6 formed in a bag shape into the inside of the water collecting pipe 7 is collected. It is formed in the axial direction of the water pipe 7. Then, as shown in FIG. 3 (b), the open end 6 a of the membrane leaf 6 is bonded so that the opening 6 b of the pressed membrane leaf 6 covers the opening (through hole) 71 of the water collecting pipe 7. A slit as an opening may be formed in the water collecting pipe 7 in the axial direction, and the open end 6a of the membrane leaf 6 may be fitted into the slit and bonded.

  And as shown in FIG.3 (c), the water supply side spacer 8 is attached to the outer side of the film | membrane leaf 6 used as the bag shape, and these are wound around the water collection pipe | tube 7. As shown in FIG. Thereafter, the outermost periphery is covered with the above-described waterproof film 9 (see FIG. 2) in a watertight manner. In FIG. 3, one set of membrane leaf 6 and water supply side spacer 8 is shown. However, as shown in FIG. 2, a plurality of sets may be provided and wound.

  In this way, the membrane leaf 6 and the water supply side spacer 8 are wound and covered with the waterproof membrane 9, so that the filtration device 1 has a substantially circular shape centering on the water collecting pipe 7 as a whole as shown in FIG. It is formed in a column shape.

  And the 1st cover body 10 which formed the raw | natural water supply port 10a is attached to one end (front side in FIG. 2) of the water collection pipe | tube 7, and 2nd is attached to the other end (back side in FIG. 1). A lid 11 is attached.

  The first lid 10 is formed with a closed portion 10b that closes one end of the water collecting pipe 7 at the center, and the raw water supply ports 10a are formed radially around the closed portion 10b. Thus, the raw water supply port 10a is formed in a radial shape so that the entire circumference on one end side of the water supply side spacer 8 is communicated with the raw water supply port 10a.

  The second lid body 11 is formed with an insertion hole (not shown) through which the other end of the water collection pipe 7 (the purified water discharge port 7c) is inserted in the center.

  In addition, a seal ring (seal part) 12 for watertightly sealing between one end side of the filtration device 1 and a housing 21 to be described later is fitted to the outer periphery of the first lid body 10, and the second lid On the outer periphery of the body 11, a seal ring (seal part) 13 that fits between the other end of the filtration device 1 and the housing 21 in a watertight manner is fitted.

  The function of the filtration device 1 having such a configuration is as follows.

  First, when raw water is introduced from the raw water supply port 10a, the raw water is supplied to the entire circumference of one end side of the water supply side spacer 8 with a constant pressure, and then travels in the other end direction along the water supply side spacer 8. . While the raw water moves through the water supply side spacer 8, the water excluding impurities in the raw water passes through the filtration membrane sheets 2 and 3. Then, the permeated water (purified water) that has passed through the filtration membrane sheets 2 and 3 is collected in the water collecting pipe 7 through the conductive mesh sheet 4 in the bag-like filtration membrane sheets 2 and 3. It moves inside and is discharged from the purified water discharge port 7c. In addition, the electroconductive mesh sheet 4 and the water supply side spacer 8 are provided in order to form a clearance gap between the wound filtration membrane sheets 2 and 3, and to ensure a flow path.

  Next, a water treatment apparatus using such a filtration apparatus will be described.

  FIG. 4 shows a water treatment device 20 using the filtration device 1 described above, and this water treatment device has the first end plate 21a and the second end on the outside of the filtration device 1 shown in FIG. It is formed by watertightly covering with a cylindrical housing 21 closed by an end plate 21b. FIG. 4 is a diagram schematically showing the water treatment device for convenience, and there are portions that differ in configuration in detail from the filtration device 1 shown in FIG. 2, but members denoted by the same reference numerals have the same functions. It is to be prepared.

  The housing 21 is made of an insulating material, and includes a raw water inlet 22 that supplies raw water to the filtration device 1 and a purified water discharge port 23 that discharges purified water filtered by the filtration device 1. And these raw | natural water inlet 22 and the purified water discharge outlet 23 are watertightly partitioned off by the seal rings 12 and 13 mentioned above.

  In the present embodiment, the raw water inlet 22 is provided at the center of the first end plate 21a, and the purified water discharge port 23 is provided at the center of the second end plate 21b. The discharge port 23 is formed so as to protrude from each end plate 21a, 21b in a cylindrical shape. At this time, the other end portion 7 b of the water collecting pipe 7 is fitted in a watertight manner to the inner periphery of the purified water discharge port 23 via the O-ring 24.

  Therefore, in the water treatment device 20 according to the present embodiment, the raw water introduced into the housing 21 from the raw water inlet 22 is filtered by the filtration device 1 and collected as purified water in the water collecting pipe 7, and then collected. It is discharged to the outside from the purified water discharge port 23 along the water pipe 7. The purified water discharge port 23 is connected to a faucet or the like, and purified water is supplied through the faucet or the like.

  Here, in the present embodiment, as shown in FIG. 4, the voltage application unit 5 described above has one electrode connected to the primary-side energization unit 52 provided at the raw water inlet 22 and the other electrode It is connected to a secondary side energization part 53 provided at the purified water discharge port 23. At this time, by changing the electrodes applied to the primary side energization unit 52 and the secondary side energization unit 53 by a switching function (not shown), it is possible to change the plus or minus of the electric charge charged in the filtration membrane sheets 2 and 3. .

  In this way, by applying a voltage to the primary-side energization unit 52 and the secondary-side energization unit 53, the water in the housing 21 is used as a conductor, and the filtration membrane is passed through the conductive mesh sheet 4 and the water in the housing 21. The sheets 2 and 3 are conducted, and the membrane surfaces 2a and 3a of the filtration membrane sheets 2 and 3 can be charged.

  In the present embodiment, the positive side of the voltage is applied to the primary side energization part 52, and the negative side of the voltage is applied to the secondary side energization part 53, and the membrane surface 2a of the filtration membrane sheets 2, 3 3a is negatively charged. Thus, by negatively charging the membrane surfaces 2a and 3a of the filtration membrane sheets 2 and 3, anion components such as nitrate ions and fluorine ions in the raw water can be repelled, and the negative ion components in the raw water Can be prevented from passing through the filtration membrane sheets 2 and 3. Moreover, it becomes possible to remove the positive ion components in the raw water by attaching positive ion components such as heavy metal ions to the membrane surfaces 2a and 3a.

  At this time, it is preferable that the voltage value to be applied can be variably controlled. Thus, by changing the voltage value to be applied, the charging strength of the membrane surfaces 2a and 3a of the filtration membrane sheets 2 and 3 can be changed, and the removal rate of the ionic components in the raw water can be changed. Become. That is, the amount of ion component to be removed when passing through the filtration membrane sheets 2 and 3 can be set to a desired value.

  In this way, the membrane surfaces 2a and 3a of the filtration membrane sheets 2 and 3 were charged, so that the filtration membrane sheets 2 and 3 were formed of a material that cannot originally remove ionic components in water, such as a UF membrane and an MF membrane. Even in this case, it is possible to remove ionic components in water. As a result, the selection range of the material of the filtration membrane sheets 2 and 3 is widened, and it is not necessary to form the filtration membrane sheet using a special material, and the inexpensive filtration device 1 can be obtained.

  Furthermore, in this embodiment, the water treatment apparatus 20 arrange | positions the said housing 21 so that the purified water discharge outlet 23 side of the housing 21 may become upper.

  Further, the water treatment device 20 includes a supply pump 27 that supplies raw water into the housing 21, a first on-off valve 25 that opens and closes the raw water inlet 22 of the housing 21, and a drain for discharging water in the housing 21. A second on-off valve 26. In the present embodiment, the second on-off valve 26 is connected to the end of the housing 21 on the raw water inlet 22 side. In addition, as the 1st and 2nd on-off valves 25 and 26, a check valve, an electric valve, etc. can be used.

  Next, the control method of this water treatment apparatus 20 is demonstrated.

  First, during the filtration operation, the water treatment apparatus 20 starts the supply pump 27, opens the first on-off valve 25, closes the second on-off valve 26, and closes the filtration membrane sheet 2, 3 film surfaces 2a and 3a are charged negatively. By doing so, raw water is supplied into the housing 21 from the raw water inlet 22 via the supply pump 27, and the purified water filtered through the filtering device 1 mounted in the housing 21 is supplied to the purified water discharge port of the housing 21. 23 can be discharged. At this time, since the membrane surfaces 2a and 3a of the filtration membrane sheets 2 and 3 are negatively charged, the ionic components can be removed together with the dirt components in the raw water, and the purified water can be purified. Can be supplied through.

  On the other hand, during the cleaning operation of the water treatment device 20, as shown in FIG. 6, the raw water supply pump 27 is stopped and the first on-off valve 25 is closed, and the membrane surfaces 2 a, 3 a of the filtration membrane sheets 2, 3. Is reversely charged (in this case, plus), and the second on-off valve 26 is opened after a certain period of time.

  At this time, since the water treatment apparatus 20 arrange | positions the housing 21 so that the purified water discharge outlet 23 side may become upper, the water in the housing 21 is drained through the 2nd on-off valve 26 with a hydraulic head pressure. . At this time, since the membrane surfaces 2a and 3a of the filtration membrane sheets 2 and 3 are positively charged, the positive ion component adhering to the filtration membrane sheets 2 and 3 is separated from the filtration membrane sheets 2 and 3. Can do. Therefore, the ionic components separated from the filtration membrane sheets 2 and 3 together with the dirt components adhering to the filtration membrane sheets 2 and 3 are also drained through the second on-off valve 26.

  As described above, by periodically performing the cleaning operation of the water treatment device 20, it is possible to regenerate the filtration membrane sheets 2 and 3 by washing the membrane leaf 6 that has been clogged due to continued use and the filtration function has deteriorated. The life of the filtration device 1 can be extended.

  5 and 6 schematically show the water treatment apparatus 20 capable of performing the cleaning operation. The first on-off valve 25 and the second on-off valve 26 are actually connected via piping. Are connected to the housing 21.

  Moreover, the water treatment apparatus 20 can be controlled so as to start the cleaning operation every time a predetermined time elapses using a timer. In addition to this, the water treatment apparatus 20 is controlled so as to start the washing operation using means capable of detecting the pressure on the supply side of the raw water, or detecting the degree of contamination such as turbidity, conductivity or flow rate of the purified water. It is also possible to do.

  According to the above embodiment, since the membrane surfaces 2a and 3a of the filtration membrane sheets (filtration membrane materials) 2 and 3 can be charged by the voltage application unit (charging means) 5, the filtration membrane sheet (filtration membrane material). ) When the raw water is filtered through 2 and 3, the ionic components in the raw water can be removed. That is, according to this embodiment, the filtration apparatus 1 which can improve filtration performance can be obtained.

  In addition, according to the present embodiment, the filtration membrane sheets (filtration membrane materials) 2 and 3 are formed in a bag shape, and a mesh-like conductive mesh sheet is formed inside the filtration membrane sheets (filtration membrane materials) 2 and 3. By arranging the (permeate-side spacer) 4, the purified water filtered through the filtration membrane sheets (filtration membrane materials) 2, 3 easily moves inside the filtration membrane sheets (filtration membrane materials) 2, 3. Will be able to. That is, it becomes possible to distribute purified water throughout the inside of the filtration membrane sheets (filtration membrane materials) 2 and 3. Here, according to this embodiment, since the conductive mesh sheet (permeated water side spacer) 4 is formed of a conductive material, if the conductive mesh sheet (permeated water side spacer) 4 is energized, The filtration membrane sheets (filtration membrane materials) 2 and 3 can be energized through the purified water. Thus, according to the present embodiment, almost the entire surface of the filtration membrane sheets (filtration membrane materials) 2 and 3 can be charged, and the filtration performance of the filtration device 1 can be further improved.

  Further, according to the present embodiment, the filtration device 1 includes the conductive mesh sheet (permeated water side spacer) 4 disposed inside the filtration membrane sheets (filtration membrane materials) 2 and 3 and the filtration membrane sheet (filtration membrane). Material) The water supply side spacer 8 is arranged outside the materials 2 and 3, and the open side end portions 6 a of the filtration membrane sheets (filtration membrane materials) 2 and 3 formed into a bag shape are fixed so as to communicate with the inside of the water collecting pipe 7. In this state, the filtration device 1 can be downsized without reducing the effective filtration area of the filtration membrane sheets (filter membrane materials) 2 and 3.

  Moreover, according to this embodiment, the water treatment apparatus 20 which can improve filtration performance by forming the water treatment apparatus 20 using the filtration apparatus 1 can be obtained.

  Moreover, according to this embodiment, since the outer side of the filtration apparatus 1 was covered with the housing 21 which has the raw | natural water inlet 22 and the purified water discharge outlet 23, it becomes possible to use the filtration apparatus 1 as a cartridge, and the filtration apparatus 1 Can be easily exchanged.

  Further, according to the present embodiment, the water treatment apparatus 20 opens the first on-off valve 25 that opens and closes the raw water inlet 22 and performs the second opening and closing for drainage that discharges the water in the housing 21 during the filtration operation. The valve 26 is closed, and the membrane surfaces 2a and 3a of the filtration membrane sheets (filtration membrane materials) 2 and 3 are charged negatively (one of plus or minus). In this way, negative ions in the raw water are repelled and suppressed from passing through the filtration membrane sheets (filtration membrane materials) 2 and 3, and positive ions are attached to the filtration membrane sheets (filtration membrane materials) 2 and 3. Thus, ionic components in the raw water can be removed. And the purified water which removed and refine | purified the ionic component with the stain | pollution | contamination component in raw | natural water can be discharged from the purified water discharge outlet 23 now.

  On the other hand, during the cleaning operation, the water treatment device 20 stops the raw water supply pump 27 and closes the first on-off valve 25 so that the membrane surfaces 2a and 3a of the filtration membrane sheets (filtration membrane materials) 2 and 3 are removed. By positively charging (opposite to the time of filtration operation), the positive ion components attached to the filtration membrane sheets (filtration membrane materials) 2 and 3 can be electrochemically separated. Thereafter, when the second on-off valve 26 is opened, in the present embodiment, the housing 21 is disposed so that the purified water discharge port 23 side is on the upper side. Water is drained through the on-off valve 26. At this time, the positive ion components separated from the filtration membrane sheets (filter membrane materials) 2 and 3 together with the dirt components adhering to the filtration membrane sheets (filter membrane materials) 2 and 3 are also discharged through the second on-off valve 26. Will be. Thus, according to the present embodiment, the filtration device 1 can be efficiently cleaned, and the regeneration efficiency of the filtration membrane sheets (filtration membrane materials) 2 and 3 can be increased. In this way, by periodically performing the cleaning operation of the water treatment device 20, the filtration membrane sheets 2 and 3 can be regenerated, and the life of the filtration device 1 can be extended.

  Moreover, according to this embodiment, the electroconductive mesh sheet 4 is arrange | positioned in the bag-shaped filtration membrane sheets 2 and 3, and the voltage application part (charging means) 5 which charges the filtration membrane sheets 2 and 3 is provided. Since the filtration device 1 is formed, the filtration device 1 can have a relatively simple configuration, and the filter membrane 1 (filter membrane material) 2 and 3 can be efficiently regenerated while the filter device 1 is small. It becomes possible to plan.

  In addition, in simple backwashing, only the portion of the filtration membrane sheets 2 and 3 through which water easily passes can be washed. However, according to the washing method of this embodiment, the entire surfaces of the filtration membrane sheets 2 and 3 can be washed efficiently. There is also an advantage.

  Moreover, according to this embodiment, since the filtration membrane sheets (filtration membrane materials) 2 and 3 are washed using the water head pressure, the filtration membrane is filtered as compared with the case where a backwash pump is used as in the prior art. Deterioration and breakage of the membrane sheets (filtration membrane materials) 2 and 3 can be suppressed.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

  For example, in the above-described embodiment, the membrane surface of the filtration membrane material is charged using a conductive mesh sheet. However, the present invention is not limited to this, and a conductive material such as carbon, conductive resin, or metal powder is used. The filter membrane material may be formed of a material mixed with the filter membrane material, and the filter membrane material itself may have an energization function. By doing so, the filtration membrane material has a conductive function, so that the membrane surface of the filtration membrane material can be more reliably charged, and the filtration performance can be further improved.

  In addition to this, as the structure for energizing the filtration membrane material itself, a structure in which a conductive wire is stretched on the surface of the filtration membrane material, a structure in which the filtration membrane material is formed of a conductive resin material, and the filtration membrane material are conductive. Examples include a structure in which a resin is coated or a structure in which a filtration membrane material is formed of a metal material. Moreover, when the filtration membrane material itself has a current-carrying function, the permeated water side spacer inside the filtration membrane material may be conductive or may not be conductive.

  In the above embodiment, the first and second on-off valves are separately provided. However, a three-way valve that also serves as the first and second on-off valves may be used. In this way, since a minimum valve configuration is sufficient, it is possible to obtain a water treatment device that is inexpensive and has few failures.

  Further, the filter membrane material, the permeated water side spacer, the housing, and other detailed specifications (shape, size, layout, etc.) can be appropriately changed.

1 Filtration device 2, 3 Filtration membrane sheet (filtration membrane material)
2a, 3a Membrane surface 4 Conductive mesh sheet (permeated water side spacer)
5 Voltage application part (charging means)
7 Catch pipe 12 Seal ring (seal part)
13 Seal ring (seal part)
DESCRIPTION OF SYMBOLS 20 Water treatment apparatus 21 Housing 22 Raw water inflow port 23 Purified water discharge port 25 1st on-off valve 26 2nd on-off valve 27 Supply pump

Claims (7)

A filtration apparatus comprising a filtration membrane material that filters raw water through,
A filtration device comprising charging means for charging the membrane surface of the filtration membrane material. The filtration membrane material is formed in a bag shape, and a permeated water side spacer is disposed inside the filtration membrane material,
The filtration device according to claim 1, wherein the permeated water side spacer is formed in a mesh shape with a conductive material.   The filtration device according to claim 1 or 2, wherein the filtration membrane material has a conductive function.   The filtration device has the permeated water side spacer arranged inside the filtration membrane material and the water supply side spacer arranged outside the filtration membrane material, and has an open side end portion of the bag-like filtration membrane material. The filtration device according to claim 2 or 3, wherein the filtration device is formed by being wound around the water collecting pipe in a state of being fixed so as to communicate with the inside of the water collecting pipe.   The water treatment apparatus using the filtration apparatus of any one of Claims 1-4.   A housing for watertightly covering the outside of the filtration device; a raw water inlet for supplying raw water to the filtration device; a purified water discharge port for discharging purified water filtered by the filtration device; and the raw water inlet The water treatment apparatus according to claim 5, further comprising: a seal portion that partitions the water purification outlet and the water purification outlet in a watertight manner. It is a control method of the water treatment apparatus according to claim 6,
The water treatment device includes a supply pump that supplies raw water into the housing, a first on-off valve that opens and closes a raw water inlet of the housing, and a second on-off valve for drainage that discharges water in the housing. With
The housing is arranged such that the water purification outlet side of the housing is on the upper side,
During the filtration operation of the water treatment device, the first on-off valve is opened and the second on-off valve is closed, and the membrane surface of the filtration membrane material is charged positively or negatively. The supply pump is stopped, the first on-off valve is closed, the membrane surface of the filter membrane material is charged opposite to that during the filtration operation, and then the second on-off valve is opened. Control method of water treatment equipment.

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