JP2014033985A - Liquid filter device and ballast water treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid filter device capable of suppressing a space required for maintenance with a simple structure, by striking a balance between a high filtering treatment capacity and a small footprint so as to be applicable to a ballast water treatment apparatus.SOLUTION: A liquid filter device performs filtering while rotating a cylindrical filter with a filtration surface disposed on the side surface of a cylinder around a cylinder shaft, and includes at least one filter cartridge having the cylindrical filter, an upper lid member and a bottom closure member. In the liquid filter device, the upper lid member and filter cartridge along with the bottom closure member and filter cartridge are detachably constructed through a sealing member, respectively.

Description

  The present invention relates to a liquid filtration apparatus provided with a filter for filtering turbid components and the like, and more particularly, to a liquid filtration apparatus for treating marine sea water for ship use and a ballast water treatment apparatus using the same.

  In recent years, the treatment of ballast water loaded on ships has become a problem. Ballast water is seawater loaded on a ship for safe navigation even when the ship is empty, and various methods for removing or killing or inactivating microorganisms by purifying the ballast water have been studied. Patent Document 1 discloses a ballast water treatment apparatus by the present inventors. The apparatus is arranged in a cylinder so as to surround the axis, is provided so as to be rotatable around the axis, and has a pleated shape bent in the radial direction of the cylinder, and is processed toward the outer peripheral surface of the filter. A case having a treated water nozzle through which water flows out, a case having an outer cylinder portion provided inside the nozzle port of the treated water nozzle provided so as to surround the filter, and a case in which filtered water that has passed through the filter is passed from the inside of the filter cylinder. This is a filtration device provided with a filtered water flow path leading out to the outside and a discharge flow path for discharging discharged water not filtered by the filter to the outside of the case.

Japanese Patent No. 4835785

  The apparatus described in Patent Document 1 has a configuration in which the filter surface is intermittently washed with water to be treated while being filtered by a rotary filter, so that continuous high flow filtration processing is performed without particularly performing reverse cleaning. Is possible. Here, it is necessary to perform ballast water treatment in a short time while anchored at a port in a large-capacity ship of tens of thousands tons and hundreds of thousands of tons, such as a tanker or a luggage carrier. Therefore, the amount of ballast water treated per hour reaches a level of several hundred tons and thousands of tons. For this reason, such a processing apparatus becomes a large facility, but the place where such an apparatus is installed in the ship is a limited space such as the bottom of the ship. In general, the space required for maintenance such as replacement and cleaning inside the apparatus is also limited.

  The ballast water treatment problem has become a problem in recent years for the purpose of environmental conservation and biodiversity protection, and the regulatory treaty will come into effect within a few years at the latest. For this reason, it is necessary to consider the introduction of equipment into existing ships, and the problem of installation space can be a major obstacle to the introduction of equipment. For example, even if the apparatus can be installed in the cabin of an existing ship, there is a problem that a space equivalent to the apparatus is required for work such as filter replacement. In particular, the restriction on the ceiling height in the cabin is a restriction such as filter replacement in apparatus maintenance. Therefore, the present invention provides a liquid filtration device that can achieve a high filtration capacity and a small installation area, and can suppress a space required for maintenance with a simple structure so that it can be applied to a ballast water treatment device. With the goal.

  As a result of intensive studies, the inventors of the present application have completed the present invention by paying attention to a structure that can be removed and attached in a space where the removal and attachment of the filter is limited due to filter replacement or the like. That is, the present invention is a liquid filtration device that performs filtration while rotating a cylindrical filter having a filtration surface disposed on a side surface of a cylinder around an axis of the cylinder, and includes at least one of the cylindrical filters. A liquid filtration apparatus comprising a filter cartridge, an upper lid member, and a bottom lid member, wherein the upper lid member and the filter cartridge, and the bottom lid member and the filter cartridge are configured to be detachable via seal members, respectively. It is.

  In particular, it is effective if a plurality of filter cartridges are provided coaxially and the filter cartridges are configured to be detachable via a seal member.

  By constructing the filter as a cartridge structure in such a manner that it can be detached and attached in this way, it is possible to reduce the space above and around the device necessary for operations such as removing the filter cartridge from the device, resulting in efficiency in a narrow space. It is possible to install a large-sized filtration device well.

  The filter cartridge includes the cylindrical filter, a frame member that holds the cylindrical filter in a cylindrical shape, and a support member that is disposed concentrically from the upper surface side to the lower surface side of the cylindrical filter. It should be included. This is because the filter is a membrane material such as a non-woven fabric, and a reinforcing material is appropriately disposed in order to handle it as an independent structure as a cartridge.

  The cylindrical filter may be a pleated filter having a pleated shape in which a plurality of crests and troughs bent in the radial direction of the cylinder are continuous. This is because a large filtration area can be effectively secured and a large amount of treated water can be secured in a limited space.

  Furthermore, the top cover member and the bottom cover member may be made of a corrosion-resistant metal, and the frame member may be made of a resin. In particular, when a corrosive liquid such as seawater is processed, each member is preferably made of stainless steel having high corrosion resistance such as SUS304 or SUS316. On the other hand, the filter cartridge itself is required to be light in weight in order to facilitate work such as replacement in a limited space. Therefore, it is possible to configure the entire strength and weight in a well-balanced manner by appropriately using metal and resin as members.

  The above invention includes a filter cartridge used in a liquid filtration device, and a ballast water treatment device mounted on a ship using these liquid filtration devices as a seawater filtration device.

  According to the above invention, the liquid can be removed and attached in a limited space, can achieve both high filtration capacity and a small installation area, and can suppress the space required for maintenance with a simple structure. A filtration apparatus and a ballast water treatment apparatus using the same can be provided.

It is a longitudinal cross-sectional schematic diagram which shows the structural example of the liquid filtration apparatus of this invention. It is a cross-sectional schematic diagram which shows the AA cross section of FIG. It is a schematic diagram explaining the pleat structure of the cylindrical filter with which the liquid filtration apparatus of this invention is provided. It is a perspective view which shows the structural example with which the filter cartridge used for this invention, the upper cover member, the bottom cover member, and the sealing member were assembled. FIG. 5 is a schematic perspective view illustrating an internal structure in the configuration example of FIG. 4. It is a figure explaining the structure of the upper cover member in the structural example of FIG. 4, a sealing member, and a filter cartridge. It is a schematic diagram explaining the structure of a filter cartridge. It is a figure which shows the example of a connection structure of a filter cartridge. It is a block diagram explaining the structure of the ballast water treatment apparatus of this invention.

  The configuration of the liquid filtration device according to the present invention will be described with reference to the drawings when used as a typical marine ballast water treatment device. Elements denoted by the same reference numerals in different drawings indicate the same or corresponding elements. In addition, this invention is not limited to this, It is shown by the claim, and it is intended that all the changes within the meaning and range equivalent to a claim are included.

  FIG. 1 is a diagram showing an example of a liquid filtration device according to the present invention, and schematically shows a longitudinal section of the device. FIG. 2 schematically shows an AA cross section in FIG. This will be described below with reference to both the drawings. The filter cartridge 10 provided with a filtration membrane on the side surface of the cylinder is disposed so as to surround a central axis C serving as a rotation center. In this example, a structure is shown in which two filter cartridges 10 are overlapped in the cylindrical axis direction, but the number of overlaps can be arbitrarily selected depending on the design of the size of the apparatus, the amount of filtered water, and the like. The plurality of filter cartridges 10 are connected via a seal member 23 so as not to leak liquid. The uppermost part of the filter cartridge 10 is closed by the upper lid member 21 via the seal member 23, and the lowermost part of the filter cartridge 10 is also closed by the bottom lid member 22 via the seal member 23. A rotation shaft 24 is connected to the upper lid member 21 on the central axis, and the rotation shaft 24 is configured to be rotatable by a motor 50. The bottom cover member 22 has a pipe through which the inside of the cylinder and the outside of the cylinder pass through the center, and the bottom cover member 22 is a bearing capable of sealing the inside and outside of the cylinder so that the filter cartridge 10 can rotate around the pipe. 25 is provided.

  A case 30 is provided so as to accommodate the entire cylindrical filtration membrane portion having the filter cartridge 10 as a main constituent member. The case 30 includes a case lid portion 32, a case outer cylinder portion 31, and a case bottom portion 33. When used for ballast water treatment exceeding 100 ton / hour as a standard of size, the outer diameter of the case outer cylinder portion 31 is about 400 mmφ. The case lid 32 has a rotating shaft passing therethrough, and a bearing (not shown) that can be sealed is also provided in the penetrating portion. In this example, the treated water channel 41 is connected to the case outer cylinder portion 31, and the treated water is supplied to the treated water nozzle 42 inside the case 30. Further, the filtered water passage 45 passes through the case outer cylinder portion 31. A drain water passage 46 is provided in the case bottom 33.

  FIG. 3 is a diagram for explaining a pleated filter structure as a configuration example of the cylindrical filter 11 used in the filter cartridge. The filter 11 has a so-called pleated shape obtained by alternately folding a band-shaped planar base material in a mountain-and-valley shape, and is further formed by joining them in a cylindrical shape. Thus, by forming a pleated shape in which a plurality of crests and troughs bent in the radial direction of the cylinder are continuous, the filtration area can be increased, which is suitable for large-capacity filtration. In FIG. 3, a liquid to be filtered is supplied from the outside of the cylinder of the filter 11, and the filtrate filtered by the filter 11 is obtained inside the cylinder. A porous resin sheet is used for the base material of the filter 11. For example, a porous structure such as a stretched porous body, a phase-separated porous body, or a nonwoven fabric made of polyester, nylon, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), etc. is used. Is done. For the purpose of performing high flow treatment such as ballast water treatment, a nonwoven fabric made of polyester such as polyethylene terephthalate is particularly preferably used. Examples of dimensions include an outer diameter of 700 mm, an axial length of 320 mm, an effective area height of 280 mm, a pleat depth of 70 mm, and a number of pleats of 420 folds. The effective area can be changed depending on the required amount of treated water. This can be handled by using a plurality of filters in parallel.

  In the above configuration, the operation of the filtration process will be described with reference to FIG. The treated water supplied through the treated water channel 41 is ejected from the treated water nozzle 42 toward the filter surface of the filter cartridge 10. A part of the water to be treated filled in the case 30 is filtered by the filter and permeates into the cylinder of the filter cartridge 10. In addition, a part of the water to be treated that is not filtered and the suspended turbid matter are discharged to the outside of the case 30 through the discharge water passage 46. The filtered water filtered by the filter is led into the central pipe 43 from the filtered water opening 44 opened in the central pipe 43 inside the filter, and is led out of the case through the filtered water flow path 45.

  Here, the filter cartridge is rotated by the motor 50 in the filtration process. Accordingly, the filter surface is sequentially washed by the water to be treated ejected from the water nozzle 42 to be treated, and at the same time, the filtration proceeds on the entire outer peripheral surface of the filter. As a result, it is possible to perform a filtration process for a long time while suppressing clogging of the filter. Moreover, there is an advantage that the filtration flow rate can be adjusted by arbitrarily setting and changing the rotation speed. The motor 50 is driven by electric power from a drive control unit (not shown). The number of revolutions may be constant, or may be arbitrarily determined artificially, but is more preferably controlled according to the state of filtration. It is preferable to provide a detection unit that detects the state or flow rate of filtered water and perform control so as to change the number of rotations according to detection information. Specific examples of the filtrate water detection unit include a filtrate water flow rate detection unit, a filtrate water pressure detection unit, and a turbidity detection unit.

  The structure of the filtration membrane portion in which a plurality of filter cartridges are combined will be described in detail with reference to FIGS. FIG. 4 is a perspective view showing a filtration membrane portion of a liquid filtration apparatus as one embodiment. In this example, three filter cartridges 10a, 10b, and 10c are stacked in the cylindrical axis direction. The filter cartridges are sealed by seal members 23b and 23c so that there is no liquid leakage. The upper opening of the uppermost filter cartridge 10a is closed by the upper lid member 21 via the seal member 23a. The lower opening of the lowermost filter cartridge 10c is provided with a bottom cover member 22 via a seal member 23d. Here, each filter cartridge includes a frame member 12 and a filter 11. The filter 11 can be a cylindrical pleated filter having the structure illustrated in FIG.

  FIG. 5 is a schematic perspective view for further explaining the internal structure of the filtration membrane portion shown in FIG. The inside of the pleated filters of the filter cartridges 10a, 10b, and 10c is a cylindrical space. Filtered water is filtered by a filter, and the inside of the cylinder is filled with filtered water. In order to take out such filtered water, a central pipe 43 is provided on the cylindrical shaft. In this example, a structure in which the central pipe 43 is also divided into three parts for easy assembly is illustrated. The filtered water flows out into the central pipe through the filtered water opening 44 provided in the central pipe 43. The central pipe 43 is connected to a filtered water flow path 45 leading to the outside of the apparatus, and filtered water is taken out through the flow path.

  FIG. 6 is an exploded view of the vicinity of the filter cartridge 10a and the upper lid member 21 in order to explain the assembly structure of FIG. An upper lid member 21 is attached so as to close the cylindrical upper opening of the filter cartridge 10a. Here, a seal member 23a is provided in between so as to prevent liquid leakage inside and outside the filter cartridge. In this example, the seal member is assembled as a separate member from the upper lid member 21 and the filter cartridge 10a. However, of course, the seal member may be fixed to any member side in advance, or may be formed integrally with any member. Also good. Similarly, a seal member 23b is provided between the filter cartridge 10a and the filter cartridge 10b.

  FIG. 7 is a diagram illustrating a configuration example of the filter cartridge 10. The cylindrical filter 11 itself is a membrane member such as a nonwoven fabric and has poor mechanical strength. Therefore, the frame member 12 is provided so as to maintain the cylindrical shape of the filter 11 and not to be deformed by an external force or the like from the vertical and circumferential directions. That is, the filter 11 is fixed to the frame member 12. The fixing method may be any method as long as there is no liquid leakage inside and outside the filter and the shape can be maintained, and fixing with an adhesive or resin is preferable. Furthermore, it is preferable to provide the support member 13 inside the cylinder. The support member 13 is a cylindrical plate-shaped member having a cylindrical side surface shape and a large number of openings on the side surface, and is a structure that increases the shape retention and strength reinforcement of the filter cartridge and does not hinder the flow of filtered water. The support member 13 is preferably a corrosion-resistant metal such as stainless steel from the viewpoint of strength, and a high-strength resin material can also be used for weight reduction.

  Next, FIG. 8 shows an example of a connection structure between filter cartridges. In the liquid filtration device of the present invention, a plurality of filter cartridges are stacked for the convenience of exchanging the filter cartridges. Therefore, it is preferable that the individual filter cartridges can be easily attached and detached. For this reason, what is called a plastic buckle (one-touch buckle) or a kind of snap lock is preferably provided on the outer peripheral surface of the frame member of the filter cartridge. FIG. 8 shows a portion where the frame members of the filter cartridge are connected to each other using the plastic buckle 14. A similar structure can be used for connecting the filter cartridge and the upper lid member, and the filter cartridge and the bottom lid member. As described above, the filter cartridge can be divided into upper and lower parts and can be easily attached and detached, so that the filter cartridge can be easily divided and handled when the filter cartridge is replaced from the upper part of the apparatus. Therefore, space restrictions such as the space above the apparatus and the surrounding temporary placement are reduced, and the space can be effectively used. Further, since the individual weight of the filter cartridge is reduced, the lifting mechanism and the like at the time of replacement can be simplified, which can contribute to increase the space efficiency.

  FIG. 9 shows a block diagram of a system configuration example in which the liquid filtration device described above is used as a ballast water treatment device. The system shown in FIG. 9 is mounted on a ship, and seawater is filtered and stored. Many ballast water treatment apparatuses are composed of a filtration unit and a sterilization unit using means such as ultraviolet rays, and the present invention can be applied as a filtration unit. Seawater is taken into the apparatus from the ocean outside the ship through the intake channel 47 by the action of the pump 110. The liquid processing apparatus 100 is a liquid filtration apparatus that performs filtration while rotating a cylindrical filter having a filtration surface disposed on a side surface of a cylinder as described above. Seawater sent to the liquid filtration device 100 through the to-be-treated water channel 41 is divided into filtered water and discharged water. The discharged water is returned to the ocean again through the discharged water channel 46, and the filtered water is sent to the filtered water channel 45. The filtered water is then sterilized by microorganisms or the like by the ultraviolet irradiation device 120 and stored in the ballast water tank 130 through the tank flow path. The means of the sterilization unit is exemplified by the ultraviolet irradiation device 120, but may be replaced with other known means such as using a medicine. Ballast water treatment requires a large amount of seawater to be treated in as short a time as possible, and requires a larger filter, continuous cleaning, and the like. According to the apparatus of the present invention, it is realized with a relatively simple structure. It is possible.

  The liquid filtration device of the present invention is capable of continuous operation with a stable and high permeation flow rate by rotary cleaning, so that it can be used for brackish water and seawater such as seawater desalination and ballast water, or sewage, domestic wastewater, industrial wastewater, etc. In the case of water treatment with a large amount of water, it can be suitably used for pre-filtration treatment for removing foreign substances, dust, and microorganisms in water. In addition, since it is excellent in high turbidity water treatment and concentration treatment, it can be applied to valuable materials recovery fields such as the food field.

10, 10a, 10b, 10c Filter cartridge 11 Filter 12 Frame member 13 Support member 14 Connector 21 Upper lid member 22 Bottom lid member 23, 23a, 23b, 23c, 23d Seal member 24 Rotating shaft 25 Bearing 30 Case 31 Case outer cylinder 32 Case lid portion 33 Case bottom portion 41 Water channel to be treated 42 Water nozzle to be treated 43 Central piping 44 Filtration water opening 45 Filtration water passage 46 Discharge water passage 47 Water intake passage 48 Tank passage 50 Motor 100 Liquid filtration device 110 Pump 120 Ultraviolet Irradiation device 130 Ballast water tank

Claims (7)

A liquid filtration device that performs filtration while rotating a cylindrical filter having a filtration surface disposed on a side surface of a cylinder around an axis of the cylinder,
At least one filter cartridge having the cylindrical filter, an upper lid member, and a bottom lid member are provided, and the upper lid member and the filter cartridge, and the bottom lid member and the filter cartridge are attached and detached through seal members, respectively. A liquid filtration device configured to be possible.   The liquid filter device according to claim 1, wherein a plurality of the filter cartridges are provided coaxially, and the filter cartridges are configured to be detachable via a seal member. The filter cartridge includes the cylindrical filter, a frame member that holds the cylindrical filter in a cylindrical shape, and a support member that is disposed concentrically from the upper surface side to the lower surface side of the cylindrical filter. The liquid filtration device according to claim 1, comprising:   4. The liquid filtration device according to claim 1, wherein the cylindrical filter is a pleated filter having a pleated shape in which a plurality of crests and troughs bent in a radial direction of the cylinder are continuous. 5. 5. The liquid filtration device according to claim 3, wherein the upper lid member and the bottom lid member are made of a corrosion-resistant metal, and the frame member is made of a resin.   The filter cartridge used for the liquid filtration apparatus of any one of Claims 1-5.   The ballast water treatment apparatus mounted in a ship using the liquid filtration apparatus of any one of Claims 1-5 as a seawater filtration apparatus.

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