JP2015093261A - Pleat filter, and ballast water processing apparatus, and ballast water processing method using the pleat filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pleat filter for preventing breakage due to use so that it contributes to the stable use for a long period, and a ballast water processing apparatus using the pleat filter.SOLUTION: In a pleat filter, a filter base material having folds by repeating crest parts and trough parts is formed into a cylindrical shape having said folds axially in the ridge line direction. The pleat filter is equipped, on the folds bulging to the outer side of a cylindrical shape, with a reinforcement member on the inner side of the folds along the ridge line direction and has an adhesive joint at which the reinforcement member and the filter base material are integrated along the ridge line direction.

Description

  The present invention relates to a structure of a pleated filter mainly used for liquid filtration, and more particularly to a pleated filter used in a system for treating ballast water stored in a ship and used for filtering a large amount of water. Related to the device.

  A wide variety of filters are used for the purpose of separating and removing solids as contaminants from gases and liquids, and pleated filters that have a larger filtration area by making the filter into a pleated shape are also mainly used for gases such as air purifiers. It is used in. Patent Document 1 discloses an example in which a pleated filter formed in a cylindrical shape is used as a filter device for removing sludge from a cutting fluid of a machine tool. In this apparatus, it is said that a filter apparatus having a high filter cleaning effect can be provided by ejecting liquid toward the outer surface of the filter while rotating the cylindrical filter.

  On the other hand, in recent years, the treatment of ballast water loaded on ships has become a problem. Ballast water is seawater that is loaded on a ship for safe navigation even in an empty state, and various methods for purifying ballast water to remove or kill or inactivate microorganisms have been studied. A method of using filtration for the purpose of removing relatively large microorganisms has also been studied. For example, Patent Document 2 discloses a ballast water treatment apparatus using a filtration membrane by the applicant of the present application.

JP 2008-93783 A Japanese Patent No. 4835785

  When using brackish water and seawater such as seawater desalination and ballast water, or water treatment such as sewage, domestic wastewater, and industrial wastewater, pre-filtration treatment is required to remove foreign substances, dust, and microorganisms in the water. The inventors of the present application are considering the application of a pleated filter to such filtration. Here, it is necessary to filter a large amount of water in as short a time as possible. However, large-scale, high-flow operation is a technical problem that generally tends to cause a reduction in throughput and filtration function due to early clogging. Yes.

The device disclosed in Patent Document 2 is a filtration device that incorporates a cylindrical filter in a cylindrical container and collects the liquid flowing into the inside from the outside of the cylindrical filter as a filtrate. The filtration target liquid is sprayed from a nozzle provided on the side surface of the cylindrical container to a part of the filter filtration surface to clean the filtrate deposited on the filter surface to restore the permeation flux and to filter the washed filtrate. By draining from the front chamber, a stable filtration state is continuously continued. What is important for such a system to stably maintain continuous filtration is the cleaning effect due to the ejection of the liquid to be filtered onto the filter filtration surface. In order to efficiently and effectively clean the entire filter by changing the cleaning part of the filter over time, the cylindrical filter is rotated by a motor drive etc. during filtration to be filtered from the ejection nozzle The place where the jet of liquid hits is changed continuously and periodically. In order to reliably perform this rotary cleaning and keep a high filtration flow rate stable, it is necessary to maintain the ejection of the liquid to be filtered from the nozzle at a flow rate level that is higher than a certain level. As a result of receiving a high flow rate of liquid to be filtered, the cylindrical filter may deteriorate over time, breakage, and a part of the liquid to be filtered may directly enter the filtrate without passing through the filter. Turned out to be.
Therefore, the present invention provides a pleated filter that can be used stably for a long period of time, preventing deterioration and breakage due to use, and a ballast water treatment device and a treatment method as a filtration device using the pleat filter. Objective.

  As a result of diligent examination regarding the deterioration of the filter, the inventors of the present application confirmed that the filter that received the high flow rate of the liquid to be filtered is likely to be damaged at the bent portion corresponding to the pleat peaks and valleys, and It came to composition.

  That is, a pleat filter in which a filter base material having a fold so as to repeat a peak portion and a valley portion is formed into a cylindrical shape with the ridge line direction of the fold as an axial direction, and the pleated filter has a convex shape outside the cylindrical shape. The fold filter is provided with a reinforcing member along the ridge line direction inside the fold line, and the reinforcing member and the filter base material have an adhesive portion that is integrated along the ridge line direction of the fold line.

Further, the present application is a ballast water treatment apparatus using the pleated filter as a filtration membrane, the pleated filter seals the upper surface and the bottom surface of the cylinder in a watertight manner, and is rotatably held around a cylindrical axis. A water-treatment nozzle that flows out the water to be treated toward the outer peripheral surface of the pleated filter, and a case having an outer cylinder portion that is provided so as to surround the pleated filter and includes a nozzle port of the water-treatment nozzle inside. A filtrate flow path for leading the filtrate water that has passed through the pleat filter from the inside of the cylinder of the pleat filter to the outside of the case;
A ballast water treatment apparatus including a discharge flow path for discharging discharged water that has not been filtered by the pleated filter to the outside of the case;

  Further, the ballast water treatment device is mounted in the hull, seawater obtained from the outside of the hull is used as treated water, and after further killing treatment is performed on the filtered water treated by the ballast water treatment device, the ballast water treatment As a method for treating ballast water stored in the hull.

  According to the above, it is possible to provide a pleated filter that prevents breakage due to use and contributes to stable use for a long period of time, a ballast water treatment apparatus using the pleat filter, and a ballast water treatment method.

It is a perspective schematic diagram explaining the typical structural example of a pleat filter. FIG. 2 is an enlarged schematic diagram for explaining a relationship with a liquid to be processed, which is a part of the pleated filter of FIG. 1. (A) It is a figure which shows a part which looked at the pleated filter of FIG. 1 from the side surface. (B) It is a figure explaining the one aspect | mode of the state which a damage produces in the pleated filter of FIG. 3 (A). It is a perspective schematic diagram which shows the structural example of the pleated filter provided with the reinforcement board as an embodiment of this invention. It is an enlarged schematic diagram for demonstrating the M section which is a part of pleat filter of FIG. It is a perspective view explaining the structure of the mesh board as an example of a reinforcement board. (A) is a figure which shows an example of the ballast water treatment apparatus which is the embodiment of this invention, and is a cross-sectional schematic diagram which shows the structure of the vertical cross section containing an axis line. (B) is a figure which shows typically the structure of the horizontal AA cross section in (A). It is a graph which shows an experimental result (ModeI failure) It is a graph which shows an experimental result (ModeIII breakage) It is a block diagram explaining the example of whole structure of the ballast water treatment system using the ballast water treatment apparatus which is the embodiment of this invention.

[Description of Embodiments of Present Invention]
Hereinafter, aspects of the present invention will be listed and described.
(1) One aspect of the present application is a pleated filter in which a filter base material having a fold so as to repeat a peak portion and a valley portion has a cylindrical shape with the ridge line direction of the fold as an axial direction. Is provided with a reinforcing member along the ridge line direction on the inner side of the fold, and the reinforcing member and the filter base material are integrated along the ridge line direction of the fold line. It has a pleated filter.

  The said aspect has shown the structure where the some crease | fold of the outer peripheral side of the pleat filter comprised in the cylindrical form is each equipped with the adhesion part. The adhesion portion is a portion integrated with the filter base material so that the reinforcing member is sandwiched inside the fold of the filter base material. By having the bonding portion, bending in the direction in which the ridge line of the fold is bent is suppressed. Breakage (breaking or tearing) of the folds on the outer peripheral side caused by repeated folding in the usage state of the filter is prevented.

  Such a structure is particularly effective when it is used in a filtration device that filters the target liquid from the outside to the inside of the cylindrical pleated filter and the flow rate and pressure of the target liquid vary locally. It is. This is because the bending of the pleat filter is repeatedly bent due to the flow rate (pressure) fluctuation of the target liquid, and the folds are easily damaged. The reinforcing member is provided along the ridge line inside the fold of the filter base material. By configuring the fold line in which the reinforcing member and the filter base material are integrated, the fold line has high rigidity with respect to bending, and is difficult to be deformed and torn. The material of the reinforcing member is not limited as long as such an effect is obtained. It is preferable to have rigidity against bending, be hard to break, and have a restoring force (elastic force). Moreover, it is preferable that it is corrosion-resistant with respect to a to-be-processed liquid.

  The adhesion part is a part where the filter base material and the reinforcing member sandwiched between them are integrated, and is a part of the pleated filter along the ridge line of the fold. The integration can be most generally configured by bonding the filter base material and the reinforcing member, and the bonding may be performed by an adhesive.

  Here, a preferable aspect is (2) a pleated filter in which the adhesive portion is formed by integrating the filter base material constituting the fold and the reinforcing member sandwiched between the filter base materials by heat fusion. is there.

  By heat sealing, integration can be performed without using an adhesive. Variations in the shape and strength of the bonded portion due to the presence of the adhesive can be suppressed, and it is also preferable from the viewpoint of ease of manufacturing and reduction of material costs.

  More preferably, (3) the bonding portion may be bonded by ultrasonic bonding. Ultrasonic bonding is a method of promoting heat generation by applying ultrasonic waves to an object to be bonded and integrating them by the effect of ultrasonic vibration. A commercially available device can be used as the ultrasonic bonding device, and a reliable construction of the bonded portion can be achieved at low cost.

  The following structure is mentioned as a preferable material for the above-mentioned structure. That is, (4) the filter base material is a polyethylene terephthalate nonwoven fabric, and the reinforcing member is a plate-like body of any resin selected from the group consisting of polypropylene, polyethylene, polyamide, polyester, vinyl chloride, It is preferable to provide a large number of holes that penetrate from one surface of the plate-like body to the other surface. With these materials, adhesion by ultrasonic bonding is also possible. Moreover, when the reinforcing member is a plate-like body, an effect of supporting the entire surface from the inside of the pleats to the mountain side as a surface can be obtained.

  As the reinforcing plate, a resin member having strength necessary for ease of handling in manufacturing, weight reduction, cost and the like is preferably used. Particularly preferred is polypropylene because it has moderate strength and restoring force. Some non-metallic materials, such as metal and glass / ceramics, have a performance superior to resin in terms of strength. However, in this embodiment, a restoring force against deformation is also required. Therefore, if it is a metal, a spring material, quenching process, etc. are needed, but the above-mentioned resin material is suitable considering the processing to a net structure and the corrosivity by seawater comprehensively.

  When the folds of the pleats are arranged densely, the flow of the filtered fluid to be filtered to the inside of the cylindrical body is likely to be hindered. When the reinforcing plate is a plate without holes or the like, the flow is greatly hindered and the filtration performance may be impaired. Therefore, the reinforcing plate is preferably a so-called porous or mesh-like plate. The size of the hole is preferably about 0.5 to 8 mm (pitch is 1 to 10 mm in the case of mesh) in terms of the balance between the permeation of the filtrate and the plate strength, more preferably 3 to 5 mm (as the case of mesh The pitch is 3 to 5 mm). The plate thickness is selected in consideration of the pitch of the pleats (interval between adjacent creases) and the desired strength. 0.3 to 2 mm is preferably used, and more preferably 0.5 to 1,5 mm.

  The reinforcing plate is not limited to an independent plate material one by one. For example, the reinforcing plate has a fold so as to repeat a crest and a trough, and is provided along the cylindrical inner surface of the filter base. May be. With such a shape, an even higher reinforcing effect can be obtained.

Moreover, in this application, the ballast water treatment apparatus which used the above-mentioned cylindrical pleated filter as a filtration membrane is shown.
That is, (5) a ballast water treatment device using the above-described cylindrical pleated filter as a filtration membrane, wherein the pleated filter seals the upper surface and the bottom surface of the cylinder in a watertight manner and can rotate around a cylindrical axis. And an outer cylinder part that is provided so as to surround the pleated filter and has a nozzle port of the treated water nozzle provided therein, and a treated water nozzle that flows out the treated water toward the outer peripheral surface of the pleated filter A filtered water passage for leading filtered water that has passed through the pleated filter from the inside of the cylinder of the pleated filter to the outside of the case, and discharged water that has not been filtered by the pleated filter to the outside of the case It is a ballast water treatment apparatus provided with the discharge flow path.

  In the apparatus having such a structure, the water to be treated is ejected from the nozzle port outside the cylinder of the cylindrical pleated filter toward the outer surface of the pleat filter, and therefore the pressure of the water to be treated is concentrated on a part of the pleat. Then, pressure is applied in the direction in which the pleats are opened, and the possibility that the filter is damaged at each of the valley portion and the mountain portion as described above increases. Therefore, by adopting the above-described structure for preventing breakage due to the bonded portion, it is possible to expect effects such as suppression of occurrence of filtration failure, long-term operation of the apparatus due to the long life of the pleated filter, and reduction of operation costs.

  Further, as a method using the above-mentioned pleated filter for filtration, (6) the above-mentioned ballast water treatment device is mounted in the hull, seawater obtained from the outside of the hull is used as water to be treated, and the ballast water treatment device is treated. It is preferable to use a method for treating ballast water stored in the ship body as ballast water after further killing the filtered water.

  By using such a device or method, damage to the filter is suppressed more than before, and it becomes possible to use the filter stably for a long time without causing defective filtration. Therefore, it is possible to suppress the maintenance personnel cost and the cost as a replacement material, and it is possible to further facilitate the production of the ballast water itself.

[Details of the embodiment of the present invention]
Configurations of a pleated filter and a ballast water treatment apparatus as embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included.

(Configuration of pleat filter)
A typical structural example of a target pleated filter is schematically shown in FIG. The pleated filter 10 in FIG. 1 is formed by forming a pleat shape by repeatedly folding plate-like filter base materials 11 alternately in peaks and troughs, and connecting the both end portions into a cylindrical shape as a whole. In actual use, the upper and lower surfaces of the cylinder are closed with different members and the shape is fixed. Filtration is performed from the inside to the outside of the cylindrical filter or vice versa. In the following description of the present application, a portion V in the figure that is a fold protruding toward the inside of the cylinder is referred to as an inner end portion, and a portion M of the drawing that is a fold protruding toward the outside of the cylinder is referred to as an outer end portion. The valley portion viewed from the inside of the cylinder represents the space on the back side of the M portion between the V portion and the V portion. FIG. 1 schematically shows a pleated shape, and an actual crease does not have an ideal acute angle as shown. This will be described later.

  A porous resin sheet is used as the filter substrate. 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. However, for the purpose of performing a high flow rate treatment, a nonwoven fabric made of polyester such as polyethylene terephthalate is particularly preferably used.

  A configuration is assumed in which the liquid to be filtered is supplied from the outer peripheral side of the cylinder of the pleated filter 10 having the shape of FIG. 1 and is filtered to the inner side of the cylinder. FIG. 2 is a diagram for explaining the force applied to the filter base 11 in that case. In FIG. 2, five arrows indicate the direction in which the liquid to be processed is supplied from the outer end M side. A force P is applied to the filter base 11 in the direction in which the pleats are opened. Furthermore, the applied pressure P varies depending on the flow rate and pressure variation of the liquid to be treated, and acts on the filter substrate 11 as vibration or repeated bending depending on the configuration.

  FIG. 3A and FIG. 3B show one form of breakage that occurs in the pleated filter due to the pressure P described above. FIG. 3 (A) schematically shows a state before breakage, and FIG. 3 (B) schematically shows a state at breakage. The top and bottom of the filter are fixed for shape fixing and sealing. Therefore, when the pressure is repeatedly applied in the direction of opening the outer end portion as shown in FIG. 2, the portion D near the center of the filter is bent in the direction shown in FIG. Thereby, the filter base 11 may be cracked or broken at the D portion, and the filtration function may be impaired. In particular, when the liquid to be filtered is a liquid such as water, the pressure received by the filter is larger than that in the case of a gas such as air, and the filter is easily damaged at the bent portion.

  Opening (bending) the central portion of the filter in the direction as shown in FIG. 3B is effective in that the liquid to be treated is supplied to the back of the pleat and the flow of the filter facilitates cleaning. However, it is necessary to prevent breakage or the like caused by bending. Therefore, the inventors of the present application have studied to suppress the above-described bending by providing a reinforcing plate on the valley portion viewed from the inside of the cylindrical shape, that is, on the back side of the outer end portion. And in order to prevent damage to the outer edge, the reinforcement part along the ridgeline direction and the filter base can be integrated together along the ridgeline direction to make the reinforcement more effective. It came to the idea that it is.

  FIG. 4 is a perspective view showing the structure of a pleated filter 10 as a representative example. Reinforcing plates 2 as reinforcing members are provided in the respective valleys as viewed from the inside of the filter base 11. A plate-like reinforcing plate 2 may be mounted near the center of the adjacent V portion toward the back side of the M portion that is the outer end portion. In such a structure, the reinforcing plate may be a member having a strength that prevents the filter from being bent and deformed, and it is preferable not to excessively prevent the pleats of the filter from spreading due to the pressure of the liquid to be treated. That is, as shown in FIG. 3 (B), it is prevented from bending at an obtuse angle ("<"), but it is curved with a gentle curve and returns to its original shape when released from the pressure by the liquid to be treated. It is preferable to have a restoring force to return. In FIG. 4, the reinforcing plate 2 is not illustrated as being fixed, but the reinforcing plate 2 is fixed together with the filter base 11 by a fixing member provided at the upper part of the cylinder and a fixing member provided at the lower part of the cylinder. The fixing member is a disk-like or annular member arranged above and below the cylinder, and is a member that keeps the water-tightness of the fixing portion while fixing the shape and position of the filter base 11 and the reinforcing plate 2. Preferably, the upper end portion and the lower end portion of the filter base 11 and the reinforcing plate 2 may be fixed with a resin as an adhesive, respectively.

  FIG. 5 is an enlarged view of a part of FIG. 4 and schematically shows the configuration of the bonding portion in the M portion. The filter base material 11 is macroscopically bent at an acute angle alternately on the M side and the V side as shown in FIG. 4, but when the bent part is viewed in detail, it exists in a rounded state. In order to increase the area, the pleat interval is reduced and the space is tightly packed. FIG. 5 exaggerates these points and clearly shows the relationship with the reinforcing member (reinforcing plate). The reinforcing plate 2 constitutes an adhesive portion integrated with the filter base material 11 on the back side of the M portion. A range indicated by S in the figure is an adhesive portion. Within this range, the filter substrate 11 is bonded and integrated on at least both side surfaces of the reinforcing plate 2.

  As a representative example of a member used as a reinforcing member, a mesh-like reinforcing plate 2 is shown in FIG. FIG. 6 is an example of a resin mesh plate. Even if the reinforcing plate 2 is a simple plate material, the reinforcing effect can be obtained. However, it is preferable to provide a large number of holes penetrating from one side of the plate-like body to the other side. This is because it is difficult to obstruct the flow of the filtrate. Furthermore, like the mesh plate having unevenness in FIG. 6, by providing unevenness on the surface together with the pores, adhesion between the reinforcing plate and the filter base other than the adhesive portion can be prevented. As the porous plate material, in addition to a mesh-like plate material, a punching material in which a large number of holes are formed in the plate material, a plate material having a three-dimensional mesh-like communication hole, or the like can be used.

(Filtering device)
As a preferred application example of the filtration apparatus using the pleated filter described above, the configuration of a ballast water treatment apparatus will be described with reference to the drawings. FIG. 7A and FIG. 7B are diagrams showing an example of a ballast water treatment apparatus for ships as an embodiment of the present invention. FIG. 7A is a diagram schematically showing a configuration of a vertical section including an axis, and FIG. 7B is a diagram schematically showing a configuration of a horizontal AA section in FIG. 7A. The cylindrical pleated filter 101 is disposed so as to surround an axis serving as a rotation center, and is attached so as to be rotatable around a central pipe 140 (pipe does not rotate) disposed at the center. The upper and lower surfaces of the pleated filter 101 are closed watertight. The rotatable mounting structure also needs to be a watertight structure, but a known structure is used without any particular limitation. A case 103 is provided so as to cover the entire filter. The case 103 includes an outer cylinder part 131, a lid part 132, and a bottom part 133, and the bottom part 133 is provided with a discharge channel 108. A treated water channel 106 and a treated water nozzle 102 are provided for introducing seawater as treated water into the case 103. The treated water nozzle 102 is extended from the treated water flow path 106 so that the nozzle port 121 is provided in the outer cylinder portion 131 of the case 103, so that the treated water flows out toward the outer peripheral surface of the pleated filter 101. It is configured. Further, a motor 190 is provided on the central axis of the pleat filter 101 for rotating the pleat filter 101. The motor 190 is covered and accommodated by a motor cover 191 and is driven by electric power from a drive control unit (not shown).

  In the case of this example, the water to be treated ejected from the water nozzle for treatment 102 hits the pleat outer peripheral surface of the pleated filter 101, and the cleaning effect of the pleated filter 101 is obtained by the pressure. The water to be treated that is not filtered and the suspended matter that has settled in the case 103 are sequentially discharged from the discharge flow path 108 at the bottom 133 of the case 103. The characteristic of this apparatus is that the filtration proceeds while the turbid component and the remaining water to be treated are continuously discharged, and 10 to 20 tons / hour or even 100 tons / hour required for ballast water. It is effective to secure a processing amount exceeding. In the drawing, a valve or the like is not shown in the discharge flow path 108, but equipment necessary for maintenance and flow rate adjustment is provided. The filtered water filtered by the pleated filter 101 is guided to the filtered water flow path 107 through the water intake hole 141 provided in the central pipe 140 inside the filter and flows out of the case 103.

  The treated water nozzle 102 may have a rectangular nozzle opening 121. When a large amount of water is ejected from the water nozzle 102 to be treated onto the pleated filter surface, vibration occurs in a direction in which the fold of the pleated filter 101 opens and closes, so that a hole such as a crease is easily opened. In this example, the case where it is set as the pleated filter provided with the reinforcement board is illustrated, Breakage | damage can be suppressed effectively and long-term stable operation | movement of an apparatus is attained.

(Experimental example)
In order to confirm the effect by a reinforcement board, it filtered using the ballast water treatment apparatus shown to FIG. 7 (A) and (B). The outer diameter of the pleated filter 101 is 340 mm, the axial length is 320 mm, the effective area is 200 mm high, the pleated depth is 70 mm, and the number of pleats is 210 folds. The operating conditions are a jet flux of 9 m / sec, a filtration flow rate of 16.7 m ³ / hour, and a drainage flow rate of 3.3 m ³ / hour. The materials used are as follows.
Filter base material: Non-woven fabric made of polyethylene terephthalate (trade name: Axter G2260-1S BK0 manufactured by Toray)
Reinforcement plate: Polypropylene mesh plate (trade name: Tricarnet SN-598, manufactured by Takiron)
Mesh pitch 4.8mm x 4.8mm
Nominal thickness 1.5mm (warp 1.5mm, weft 1.2mm)

  The adhesive part was configured as follows. The reinforcing plate was cut into a strip shape and mounted inside the fold of the filter base, and the filter base and the reinforcing plate were brought into close contact with each other over 5 mm from the crease tip. Ultrasonic wave was applied to the close contact portion, and the filter base and the reinforcing plate were bonded by ultrasonic bonding. The thickness of the bonded part after bonding is 1.7 mm. Ultrasonic bonding was performed using an ultrasonic bonding machine (ultrasonic pouch sealer) manufactured by U.S. Japan Co., Ltd., with a pressing pressure of 5 bar and an oscillation time of 400 ms.

  The filtration operation was continued for 100 hours, and the results of determining the rate of filter breakage (the number of pleats that caused breakage in the total number of pleats) are shown in FIGS. In such an experiment, filter breakage was divided into two types and counted. The damage called Mode I is a damage that occurred in the horizontal direction (in the direction crossing the ridge line) near the center along the ridge line of the filter fold, and the result is shown in FIG. The damage called Mode III is a damage that occurred near the upper and lower ends along the ridge line of the filter fold, and the result is shown in FIG. In addition, the experiment was performed under the same conditions with a pleated filter of only a filter base material that does not constitute an adhesive portion as a reference.

  The Mode I breakage occurred after 50 hours in the reference, and over 20% breakage occurred in 100 hours, whereas the filter having the bonded portion by ultrasonic bonding did not break until 100 hours. In addition, the Mode III breakage occurred after 20 hours in the reference, and over 80% breakage occurred in 100 hours, whereas the filter having the bonded portion by ultrasonic bonding did break up to 100 hours. Absent. Thus, it has confirmed that the effect of the adhesion part was remarkable.

(Marine ballast water treatment system)
FIG. 10 is an explanatory view schematically showing the overall configuration of a marine ballast water treatment system using the above-described ballast water treatment device as a filtration device. In FIG. 10, water to be treated which is seawater taken from the ocean is sent by a pump 21 through a pipe 31 and supplied to a filtration device 22 which is a filtering means through a pipe 32. The filtered water filtered in the filtering device 22 is sent to a killing device 23 (not essential) such as an ultraviolet irradiation device or an electrolysis device via a pipe 33. Further, the discharged water that has not been filtered in the filtering device 22 is led out of the device through the pipe 35. The seawater subjected to the killing process is sent to the tank 24 through the pipe 34 and the pipe 36.

  Since the pleated filter of the present invention is superior in durability without causing performance deterioration due to breakage, it is necessary to use submerged water when using brackish water and seawater such as seawater desalination and ballast water, or when treating sewage, domestic wastewater, industrial wastewater, It can be suitably used for pre-filtration treatment for removing foreign matters, dust, and microorganisms. In addition, because it is excellent in water treatment and concentration treatment with high turbidity and high SS, it can be applied in the field of valuable resources recovery such as the food field.

2 Reinforcing plates 10, 101 Pleated filter 11 Filter base 21 Pump 22 Filtration device 23 Killing device 24 Tanks 31, 32, 33, 34, 35, 36 Pipe 102 treated water nozzle 103 case 106 treated water flow path 107 Filtration water flow Channel 108 Discharge channel 121 Nozzle port 131 Outer cylinder part 132 Lid part 133 Bottom part 140 Central piping 141 Water intake hole 190 Motor 191 Motor cover S Bonding part

Claims (6)

A filter base material having a fold line so as to repeat a crest and a valley part, a pleated filter having a cylindrical shape with the ridge line direction of the fold line as an axial direction,
The pleated filter has a reinforcing member along the ridge line direction inside the fold line, and the reinforcing member and the filter base material are integrated along the ridge line direction of the fold line that is convex outward in the cylindrical shape. Pleated filter with an adhesive part.   2. The pleated filter according to claim 1, wherein the adhesive portion is formed by integrating the filter base material constituting the fold and the reinforcing member sandwiched between the filter base materials by heat sealing. The pleated filter according to claim 1, wherein the adhesion portion is adhered by ultrasonic bonding.   The filter base is a polyethylene terephthalate non-woven fabric, and the reinforcing member is a resin plate selected from the group consisting of polypropylene, polyethylene, polyamide, polyester, and vinyl chloride. The pleated filter according to any one of claims 1 to 3, comprising a large number of holes penetrating from the surface to the other surface. A ballast water treatment apparatus using the cylindrical pleated filter according to any one of claims 1 to 4 as a filtration membrane,
The pleated filter seals the upper surface and the bottom surface of the cylinder in a watertight manner, and is held rotatably about the cylinder axis.
A treated water nozzle for flowing the treated water toward the outer peripheral surface of the pleat filter,
A case having an outer tube portion provided inside the pleated filter and provided with a nozzle port of the water nozzle to be treated inside;
A filtrate flow path for leading the filtrate water that has passed through the pleat filter from the inside of the cylinder of the pleat filter to the outside of the case;
A ballast water treatment apparatus comprising: a discharge flow path for discharging discharged water that has not been filtered by the pleated filter to the outside of the case.   After the ballast water treatment device according to claim 5 is mounted in the hull, seawater obtained from the outside of the hull is used as water to be treated, and after further killing treatment is performed on the filtered water treated by the ballast water treatment device A method for treating ballast water stored in the ship's body as ballast water.

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