JP2012143716A - Device for treating ballast water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for treating ballast water, which completely kills and sterilizes every species of organism living in ballast water, such as aquatic organisms, bacteria and the like.SOLUTION: The device for treating ballast water includes an ultraviolet lamp 17 and a photocatalyst body 18. The photocatalyst body 18 is configured to successively dispose a plurality of tubular base materials 18a, 18b, 18c, 18d in which cross-sectional areas of the openings thereof are reduced gradually as proceeding toward a ballast water outlet 19 from a ballast water inlet 16, thereby damaging the species of organism living in the ballast water, such as aquatic organisms, bacteria and the like, sufficiently to kill the species of organism by the ultraviolet light and a photocatalytic process while the ballast water flows in the ballast water inlet 16, is controlled by a distribution plate 26 so as to uniformly flow and then reaches the ballast water outlet 19, and discharging the killed species of organism to the outside from the tubular base materials 18a, 18b, 18c, 18d in the order of species of organism that are killed.

Description

  The present invention relates to a ballast water treatment apparatus.

  In order to carry out stable navigation of the ship, this ship is appropriately loaded and discharged with ballast water at its anchorage, but the anchorage where ballast water is taken in and the anchorage where it is discharged. Since it is often different from the ground, destruction of the ecosystem is a problem.

  In other words, if aquatic species such as aquatic organisms and bacteria that lived in a berth where the ballast water was taken in are discharged in a berth that differs from the environment, the ecosystem of the species in the basin is destroyed. There are things.

  Then, the ballast water treatment apparatus which tries to prevent destruction of the ecosystem mentioned above by processing ballast water is proposed (for example, refer to the following patent documents 1).

International Publication No. 2008/039146

  The ballast water treatment apparatus comprises a ballast water treatment tank having a ballast water inlet and a ballast water outlet, an ultraviolet irradiation means detachably provided in the ballast water treatment tank, and a plate having a photocatalytic action. It is said that by irradiating ultraviolet rays directly or indirectly to species such as aquatic organisms and bacteria, the DNA replication of aquatic organisms and bacteria is inhibited. Sterilize. Further, by bringing activated OH radicals generated by the photocatalyst into contact with aquatic organisms and bacteria, they are killed and sterilized.

  In the case of killing and sterilizing biological species such as aquatic organisms and bacteria with ultraviolet rays and photocatalyst, when ballast water passes through the ballast water treatment tank, the ballast water is sufficiently irradiated with ultraviolet rays, and the photocatalyst Need to be in direct contact.

  Since the ultraviolet rays irradiated from the ultraviolet irradiation means are diffused light from a linear light source, the ultraviolet intensity per unit area decreases at a distance. In the distance, the ultraviolet intensity per unit area decreases due to the influence of scattering and absorption by substances suspended in water.

  That is, killing and sterilizing effects can be enhanced by passing ballast water in the vicinity of the ultraviolet ray irradiation means.

  On the other hand, the bactericidal effect by the photocatalyst is highest in the vicinity of the photocatalyst that is the site where the OH radical is generated, and the activity of the photocatalyst depends on the intensity of the ultraviolet light. Therefore, high activity can be exhibited by bringing the photocatalyst close to the ultraviolet irradiation means.

  Therefore, in order to sufficiently kill and sterilize biological species such as aquatic organisms and bacteria in the ballast water, it is desirable to place the ultraviolet irradiation means and the photocatalyst close together in the ballast water treatment tank.

  However, when the ultraviolet irradiation means and the photocatalyst are arranged close to each other, the distance between the ultraviolet irradiation means and the photocatalyst becomes narrow, resulting in a flow resistance when the ballast water passes, so that the pressure loss due to the ballast water treatment tank increases. In such a state, a high load is applied to the pump for sucking and discharging the ballast water, so that the power consumption of the pump is increased and a change to a high output pump is required.

  Therefore, in the present invention, in the ballast water treatment apparatus using the ultraviolet irradiation means and the photocatalyst, the ballast water made into a laminar flow by the baffle plate is uniformly and sufficiently irradiated with ultraviolet rays, and is directly brought into contact with the photocatalyst. Thus, it is intended to sufficiently kill and sterilize biological species such as aquatic organisms and bacteria existing in the ballast water without increasing the pressure loss due to the ballast water treatment device.

  In order to solve the above problems, the present invention is provided with a cylindrical ballast water treatment tank having a ballast water inlet on one end side and a ballast water outlet on the other end side, and is detachable in the longitudinal direction of the ballast water treatment tank. An ultraviolet irradiation means, a rectifying plate provided between the ballast water inlet and the ultraviolet irradiation means, and a photocatalyst body detachably provided in the ballast water treatment tank. The photocatalyst body is connected to the ballast water inlet from the ballast water inlet. The ballast water that has flown into the ballast water inlet and is formed into a uniform laminar flow by the rectifying plate is configured by sequentially arranging a plurality of cylindrical substrates whose opening cross-sectional area gradually decreases toward the water outlet. By the time of reaching the ballast water outlet, ultraviolet rays and photocatalysts are sufficient to cause damage to aquatic organisms and bacteria in the ballast water until they are killed. In order from the previously and became species, from the cylindrical base material in constituting the photocatalyst is for discharging to the outside.

  As described above, according to the present invention, the photocatalyst body includes a plurality of cylindrical base materials, and the photocatalyst body has a plurality of opening cross-sectional areas that gradually decrease from the ballast water inlet to the ballast water outlet. By adopting a configuration in which the cylindrical base materials are arranged sequentially, the species of aquatic organisms, bacteria, etc. present in the ballast water by irradiating the ballast water with ultraviolet rays and making direct contact with the photocatalyst evenly and fully. In order to give enough damage until killing, and from the inside of the cylindrical base material that constitutes the photocatalyst in order from the killed species, it will be discharged to the outside Species such as aquatic organisms and bacteria existing in the ballast water can be sufficiently killed and sterilized without hindering the reaction of the unreacted species.

The perspective view which shows the ship using the ballast water treatment apparatus which concerns on Embodiment 1 of this invention. Front view of the main part of the ship Main front view of the ballast water treatment system The block diagram of the ballast water treatment tank which concerns on Embodiment 1 of this invention (A) Vertical sectional view of the same ballast water treatment tank, (b) Top view as seen from the lower surface of the upper lid Explanatory drawing of the area that can be killed by ultraviolet rays and photocatalysts and the damage imparted area by ultraviolet rays in the same ballast water treatment tank Relationship diagram between each cylindrical base material 18a-18d and sterilization rate The perspective sectional view of the connection part of the cylindrical base material concerning Embodiment 2 of the present invention. The perspective sectional view of the connection part of the cylindrical base material concerning Embodiment 3 of the present invention.

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

(Embodiment 1)
1 of FIG. 1 shows the ship moored in the port 2, and the sea chest 4 is provided below the waterline 3 of this ship 1. FIG.

  FIG. 2 shows the ballast water intake and discharge path of the ship 1.

  That is, when ballast water is taken into the ship 1, first, the suction direction of the switching valve 5 in the ship 1 is switched to the sea chest 4 side, the discharge direction of the switching valve 7 is switched to the inlet 8 side, and then the ship. The pump 9 in 1 is driven.

  Then, for example, seawater flows from the sea chest 4 as ballast water, and is then taken into the ballast tank 10 via the pump 9 and the inlet 8.

  When discharging the ballast water in the ballast tank 10, the suction direction of the switching valve 5 is switched to the outlet 11 side, the discharge direction of the switching valve 7 is switched to the sea chest 4 side, and then the pump 9 is driven. To do.

  Then, the ballast water in the ballast tank 10 is discharged out of the ship 1 from the outlet 11 through the switching valve 5, the pump 9, and the switching valve 7 through the sea chest 4.

  FIG. 3 shows a ballast water treatment device 12 interposed between the pump 9 and the switching valve 7 in FIG.

  This ballast water treatment device 12 kills small aquatic organisms smaller than 50 μm by pretreatment device 13 for removing dust existing in ballast water and large aquatic organisms having a size of 50 μm or more, ultraviolet irradiation means and a photocatalyst. And a cleaning liquid tank 22 for cleaning the ballast water treatment tank 14.

  Further, the ultraviolet irradiation means in the ballast water treatment tank 14 and the pump 9 in FIG. 2 are controlled by a control panel 15.

  For this reason, the ballast water that has passed through the sea chest 4 and the pump 9 is first supplied into the pretreatment device 13, where the dust present in the ballast water and large aquatic organisms having a size of 50 μm or more are removed. The

  In this state, the ballast water is then supplied from the ballast water inlet 16 into the ballast water treatment tank 14.

  FIG. 4 is a configuration diagram of the ballast water treatment tank 14 according to the first embodiment.

  In the ballast water treatment tank 14, there are a plurality of ultraviolet lamps 17 provided as an example of ultraviolet irradiation means, and a plurality of cylindrical bases whose opening cross-sectional area gradually decreases from the ballast water inlet 16 toward the ballast water outlet 19. A photocatalyst body 18 having a configuration in which the materials 18a to 18d are sequentially arranged is provided.

  In addition, the ballast water treatment tank 14 is arranged upright, and the ballast water inlet 16 is disposed on the lower end side and the ballast water outlet 19 is disposed on the upper end side.

  That is, the ballast water inflow port 16 is provided at the lower end side of the ballast water treatment tank 14 arranged upright, the ballast water outflow port 19 is provided at the upper end side, and the ballast water treatment tank 14 is vertically long in the vertical direction. The plurality of ultraviolet lamps 17 are arranged in the longitudinal direction of the central portion of the vertically long ballast water treatment tank 14. And the said photocatalyst body 18 is arrange | positioned between the outer periphery of these several ultraviolet lamps 17, and the inner periphery of the ballast water treatment tank 14 standingly arranged.

  For this reason, living organisms such as aquatic organisms and bacteria are generated by the ultraviolet rays from the ultraviolet lamp 17 provided in the ballast water treatment tank 14 and the activated hydroxyl radicals generated by the photocatalyst 18 that has received the ultraviolet rays. The seed will be killed.

  Then, the ballast water in which organism species such as aquatic organisms and bacteria are killed in this way is ballasted from the ballast water outlet 19 of the ballast water treatment tank 14 through the switching valve 7 and the inlet 8. It is taken into the tank 10.

  At this time, in FIG. 3, the switching valve 20 communicates the pretreatment device 13 and the ballast water inlet 16, and the switching valve 21 communicates the ballast water outlet 19 and the switching valve 7.

  Further, when the ballast water taken into the ballast tank 10 is discharged, the ballast water is discharged via the ballast water treatment tank 14.

  That is, the suction direction of the switching valve 5 in the ship 1 shown in FIG. 2 is switched to the outlet 11 side, the discharge direction of the switching valve 7 is switched to the sea chest 4 side, and then the pump 9 in the ship 1 is driven. (At this time, the switching valve 20 communicates with the pretreatment device 13 and the ballast water inlet 16, and the switching valve 21 communicates with the ballast water outlet 19 and the switching valve 7).

  Then, the ballast water in the ballast tank 10 is supplied from the outlet port 11 through the switching valve 5 and the pump 9 to the ballast water treatment tank 14 from the ballast water inlet port 16, and a living organism such as aquatic organisms and bacteria. After the seeds are killed, they are discharged out of the ship 1 from the sea chest 4 through the ballast water outlet 19, the switching valve 21, and the switching valve 7.

  Thus, even when ballast water is discharged, it is discharged through the ballast water treatment tank 14, so that when the ballast water is taken in, the species such as aquatic organisms and bacteria are collected in the ballast water treatment tank 14. Although killed, for example, if dormant spores of these species cannot be treated and remain, there is a possibility that they will germinate in the ballast tank 10, so that such ballast water Even during discharge, these species can be killed in the ballast water treatment tank 14.

  Further, after the ballast water is taken in and discharged, the cleaning liquid in the cleaning liquid tank 22 removes dirt adhered to the ultraviolet lamp 17 in the ballast water treatment tank 14, and the irradiation intensity of the ultraviolet lamp 17 is weakened by the dirt. Can be prevented.

  Further, for example, by supplying an abrasive to the ballast water treatment tank 14 after use together with the cleaning liquid, dirt such as aquatic organism dead bodies adhering to the surface of the photocatalyst 18 can be removed together with the ultraviolet resistant binder. .

  As a result, the surface of the photocatalyst 18 can be used as a new surface, and the killing / sterilizing effect of aquatic organisms and bacteria can be maintained in a high state even in the next use.

  At this time, the cleaning liquid causes the cleaning liquid pump 23 and the ballast water inlet 16 to communicate with each other through the switching valve 20 shown in FIG. 3, and the ballast water outlet 19 and the cleaning liquid tank 22 communicate with each other through the switching valve 21. By driving the cleaning liquid pump 23 in this state, the cleaning liquid in the cleaning liquid tank 22 can flow into the ballast water treatment tank 14.

  In this embodiment, the ballast water treatment tank 14 is arranged upright, the ballast water inlet 16 is disposed on the lower end side, the ballast water outlet 19 is disposed on the upper end side, and the ballast water is disposed at the upper end from the lower end of the ballast water treatment tank 14. However, it may be allowed to flow in reverse. The same applies to the cleaning liquid.

  As described above, in the process until the ballast water is taken into the ballast tank 10, in the ballast water treatment tank 14, the ballast water is uniformly and sufficiently irradiated with ultraviolet rays, and directly contacted with the photocatalyst. Details of the configuration of the ballast water treatment tank 14 for giving sufficient damage to the aquatic organisms and bacteria existing in the ballast water until killing will be described below with reference to FIGS. 4 to 6. explain.

  As shown in FIG. 4, the ballast water treatment tank 14 has a plurality of ultraviolet lamps 17 provided as an example of ultraviolet irradiation means, and an opening cross-sectional area gradually from the ballast water inlet 16 toward the ballast water outlet 19. A photocatalyst body 18 having a configuration in which a plurality of cylindrical cylindrical substrates 18a, 18b, 18c, and 18d that are smaller than the above are sequentially disposed is provided.

  That is, the photocatalyst body 18 is gradually reduced in diameter from the diameter of the cylindrical base material 18a at the bottom to the cylindrical base material 18b, the cylindrical base material 18c, and the cylindrical base material 18d. It has a multistage shape in which the diameter of the cylindrical substrate 18d is minimized.

  In the present embodiment, the photocatalyst 18 is a four-stage multistage shape, but the embodiment of the present invention is not limited to this. The arrangement and the number of stages of the photocatalysts 18 are determined by the amount of treated water required for the ballast water treatment tank 14, the range in which the killing and sterilizing effect of the ultraviolet lamp 17 is obtained, and the range in which the killing and sterilizing effect of the photocatalyst 18 is obtained. It is.

  The plurality of ultraviolet lamps 17 are detachably provided on the upper lid 24, and the photocatalyst body 18 is substantially centered on the plurality of ultraviolet lamps 17 and separated from the upper lid 24 by the plurality of support bodies 25. One end thereof is fixed to the upper lid 24.

  Since the ultraviolet lamp 17 and the photocatalyst 18 can be replaced periodically to maintain their killing effect, it is convenient to replace them by fixing them together to the upper lid 24 in this way.

  FIG. 5A is a vertical sectional view of the ballast water treatment tank 14 according to this embodiment.

  Between the ballast water inlet 16 and the ultraviolet lamp 17 which is an example of the ultraviolet irradiation means, a disk-shaped rectifying plate 26 having a large number of holes is provided.

  At this time, it is desirable that the rectifying plate 26 is provided with the lowermost cylindrical base material 18a and a space.

  In this way, the ballast water that has flowed from the ballast water inlet 16 becomes a uniform laminar flow by the rectifying plate 26, and then can generate vortices in the region A shown in FIG. By the generated vortex, the water flow that is uniform in the width of the rectifying plate 26 can be spread to the inner circumference of the lowermost cylindrical base material 18a.

  The area of the current plate 26 is preferably equal to or larger than the opening cross-sectional area of the cylindrical base material 18d located at the uppermost stage.

  As a result, the ballast water flowing from the ballast water inlet 16 can be made into a uniform laminar flow over the entire photocatalyst 18.

  The cylindrical base material 18a is preferably provided so as to be in close contact with the inner wall surface of the ballast water treatment tank 14.

  FIG. 5B is a top view seen from the bottom surface of the upper lid 24 of the ballast water treatment tank 14 according to the present embodiment.

  As shown in FIG. 5 (b), the ultraviolet lamp 17 is disposed substantially at the center of the photocatalyst body 18. As a result, it is possible to irradiate the photocatalyst 18 with ultraviolet rays from the ultraviolet lamp 17 with uniform irradiation intensity.

  In this embodiment, as shown in FIG. 4 and FIG. 5B, the cylindrical base materials 18a to 18d constituting the ballast water treatment tank 14 and the photocatalyst body 18 have a cylindrical shape. The shape of the opening cross section is not limited to a cylinder, and the effect of the present invention can be obtained even if the opening cross section is implemented by an ellipse or another polygon represented by a quadrangle.

  Also, the shape of the rectifying plate 26 is not limited to a disk, and may be implemented by an ellipse or other polygons typified by a rectangle as long as it matches the shape of the ballast water treatment tank 14. Even if it is dome-shaped so as to withstand the water pressure of the incoming ballast water, the effects of the present invention can be obtained.

  Next, as an effect of this embodiment, the ballast water is uniformly and sufficiently irradiated with ultraviolet rays and directly contacted with the photocatalyst to kill aquatic species such as aquatic organisms and bacteria existing in the ballast water. From the inside of the cylindrical base materials 18a to 18d constituting the photocatalyst 18 in order from the biological species that have been killed, and are killed. A mechanism by which the species can sufficiently kill and sterilize aquatic species such as aquatic organisms and bacteria present in the ballast water without interfering with the reaction of the unreacted species will be described.

  FIG. 6 is an explanatory diagram of a region that can be killed by ultraviolet rays and a photocatalyst in the ballast water treatment tank 14 according to the present embodiment.

  In general, since the irradiation intensity of the ultraviolet lamp 17 is significantly attenuated depending on the distance, in the present embodiment, the photocatalyst is used to compensate for the killing effect in a place where the irradiation intensity is weak, thereby sufficiently killing.

  Therefore, the inside of the ballast water treatment tank 14 can be divided into three regions depending on the ultraviolet irradiation intensity and the difference in presence or absence of contact with the photocatalyst.

  The region B shown in FIG. 6 is a region in which species such as aquatic organisms and bacteria existing in the ballast water can be killed only by ultraviolet rays because the distance from the ultraviolet lamp 17 is short.

  That is, it flows from the ballast water inlet 16 and becomes a uniform laminar flow by the current plate 26, passes through the region B, and reaches the ballast water outlet 19 located above, Biological species such as bacteria are sufficiently killed by ultraviolet rays.

  A region D shown in FIG. 6 is a region where biological species such as aquatic organisms and bacteria existing in the ballast water can be killed by contacting the photocatalyst 18.

  The width in the radial direction of the photocatalyst 18 in the killable region of the region D in which such an effect can be obtained increases from the lower end to the upper end. This is because the diameter of the cylindrical base materials 18a to 18d decreases from the lower end to the upper end, so that the distance from the ultraviolet lamp 17 to the photocatalyst body 18 is reduced, and the intensity of ultraviolet rays irradiated to the photocatalyst is increased. This is because the photocatalyst is more activated and the killing effect by the photocatalyst is enhanced.

  Further, the gap formed between the inner surface of the lower cylindrical base material 18a, 18b, or 18c and the outer surface of the upper cylindrical base material 18b, 18c, or 18d is the lower cylindrical base material 18a. , 18b or 18c may be configured to be equal to the width in the radial direction of each cylindrical substrate in the killable region of the region D.

  For example, it is formed between the radial width of the photocatalyst 18 in the killable region of the region D in the cylindrical substrate 18a, and the inner surface of the cylindrical substrate 18a and the outer surface of the cylindrical substrate 18b. The radial width of the gap is configured to be equal.

  Thus, aquatic species such as aquatic organisms and bacteria existing in the ballast water flowing from the ballast water inlet 16 are killed by contacting the photocatalyst 18 in the killable region of the region D in the cylindrical substrate 18a. After being destroyed, it will flow out of the photocatalyst 18 through a gap formed between the inner surface of the cylindrical substrate 18a and the outer surface of the cylindrical substrate 18b.

  Thus, the gap formed between the inner surface of the lower cylindrical base material 18a, 18b, or 18c and the outer surface of the upper cylindrical base material 18b, 18c, or 18d becomes the lower cylindrical base material. By configuring the same as the radial width of the killable region of the region D in 18a, 18b, or 18c, only the species that have been killed in the killable region of the lower region D can be used. Can flow out.

  Further, since the width in the radial direction of the photocatalyst 18 in the region D that can be killed increases from the lower end to the upper end, the inner surface of the lower cylindrical base material 18a, 18b, or 18c and the upper cylindrical base The gap formed between the outer surfaces of the materials 18b, 18c, or 18d is equally wide from the lower end to the upper end.

  A region C shown in FIG. 6 is between the region B and the region D, and is farther away from the ultraviolet lamp 17 than the region B. By ultraviolet rays, the species C such as aquatic organisms and bacteria exist in the ballast water. Although some damage can be given, ultraviolet rays alone are not enough to completely kill them, so that killing effects can be achieved by adding the killing effect of the photocatalyst 18. It is an area.

  That is, aquatic species such as aquatic organisms and bacteria existing in the ballast water flowing in from the ballast water inlet 16 become a uniform laminar flow by the baffle plate 26 and pass through the region C while being damaged to some extent by ultraviolet rays. When reaching the region D according to the water flow, the photocatalyst 18 is killed by the killing effect, and the inner surface of the lower cylindrical base material 18a, 18b, or 18c and the upper cylindrical base material 18b, 18c, or It will flow out of the photocatalyst 18 through a gap formed between the outer surface of the photocatalyst 18d.

  On the other hand, assuming that there is no gap between the cylindrical substrates, the biological species killed by the effect of the photocatalyst 18, that is, the biological species killed in the region D, is between the ultraviolet lamp 17 and the photocatalyst 18. Will continue to exist. As a result, adverse effects such as shielding the ultraviolet rays from the ultraviolet lamp 17 and reducing the activity of the photocatalyst by contacting the photocatalyst body 18 are expected.

  In this way, aquatic organisms such as aquatic organisms and bacteria existing in the ballast water flowing in from the ballast water inlet 16 pass through the region B or the region C and the region D, and any organism species are sufficiently leaked. The upper end of the cylindrical base material 18d that is killed and positioned at the uppermost stage, or the inner surface of the lower cylindrical base material 18a, 18b, or 18c, and the upper cylindrical base material 18b, 18c, or After exiting from the photocatalyst 18 through the gap formed between the outer surface of 18d, it flows out from the ballast water outlet 19 provided at the upper end.

  Note that the upper end of the cylindrical base material 18 d is preferably higher than the lower end of the ballast water outlet 19.

  If it is above, the flow in the photocatalyst 18 does not flow directly to the ballast water outlet 19, so that the flow along the inner wall of the ballast water treatment tank 14 can easily flow to the ballast water outlet 19.

  Moreover, in the ballast water treatment tank 14, the height of the cylindrical base materials 18a to 18d may be lowered from the lower stage to the upper stage.

  As the diameter of the cylindrical base materials 18a to 18d decreases from the lower end to the upper end, the distance from the ultraviolet lamp 17 to the photocatalyst body 18 is reduced, and the intensity of ultraviolet rays irradiated to the photocatalyst is increased. This is because the killing effect by the photocatalyst is increased, and even if the height of the cylindrical base materials 18a to 18d is lowered stepwise from the lower stage to the upper stage, a sufficient effect for killing can be obtained. .

  FIG. 7 shows the rate at which biological species such as aquatic organisms and bacteria existing in the ballast water are sterilized each time they pass through the cylindrical substrates 18a to 18d.

  As shown in FIG. 7, even if the height of the cylindrical base materials 18a to 18d is lowered stepwise from the lower stage to the upper stage, that is, the length of the flow path in each cylindrical base material is shortened. However, the biological species in the upstream ballast water has been damaged by ultraviolet rays for a long time, and the intensity of ultraviolet rays irradiated to the photocatalyst is increased, and the killing effect by the photocatalyst is increased, so that the cylindrical substrate 18a To the cylindrical base material 18d, almost the same killing effect can be obtained.

(Embodiment 2)
In addition to the configuration of the first embodiment, the second embodiment is characterized by a method for connecting the respective cylindrical base materials that constitute the photocatalyst body 18.

  FIG. 8 is a diagram illustrating a method of connecting the cylindrical base materials 18a to 18d in the second embodiment.

  As shown in FIG. 8, the cylindrical base materials 18 a to 18 d located adjacent to each other in the vertical direction are arranged in the upper cylindrical shape so that the cylindrical base material having a small opening cross-sectional area is located inside. It arrange | positions so that the lower end of base material 18b, 18c, or 18d and the upper end of cylindrical base material 18a, 18b, or 18c of a lower stage may overlap, and it may be fixed by the duplication part.

  When ballast water flows into the ballast water treatment tank 14, a very large water pressure is applied to the photocatalyst 18, so that each of the cylindrical base materials 18a to 18d needs to be fixed so as to withstand it.

  In this embodiment, the overlapping portion where the lower end of the upper cylindrical base material 18b, 18c, or 18d and the upper end of the lower cylindrical base material 18a, 18b, or 18c overlap with a gap is fixed with rivets or bolts. By doing so, the photocatalyst 18 is given strength that can withstand the water pressure.

  Also, as shown in FIG. 8, the lower end of the upper cylindrical base material 18b, 18c, or 18d and the upper end of the lower cylindrical base material 18a, 18b, or 18c are both linear in cross section. ing.

  With this shape, a photocatalyst is formed using a portion where the lower end of the upper cylindrical base material 18b, 18c, or 18d and the upper end of the lower cylindrical base material 18a, 18b, or 18c overlap with a gap as a flow path. It does not disturb the flow of the killed and sterilized ballast water flowing out of the photocatalyst 18 from the inside of the body 18 and the flow of the already killed and sterilized ballast water flowing outside the photocatalyst 18. . Moreover, the advantage that it is easy to manufacture and process can also be acquired.

(Embodiment 3)
FIG. 9 is a diagram illustrating a method for connecting cylindrical base materials according to the third embodiment.

  As shown in FIG. 9, in this embodiment, the upper end of the lower cylindrical base material has a shape that spreads outward in the circumferential direction.

  That is, only the upper ends of the respective cylindrical base materials 18a to 18d other than the cylindrical base material 18d are shaped to spread outward in the circumferential direction. With this shape, the photocatalyst 18 is formed using a portion where the lower end of the upper cylindrical base material 18b or 18d and the upper end of the lower cylindrical base material 18a, 18b or 18c overlap with a gap as a flow path. The sterilized and sterilized ballast water that flows out of the photocatalyst 18 from the inside is more likely to flow out of the photocatalyst 18. At the same time, the already killed and sterilized ballast water flowing outside the photocatalyst 18 can be made difficult to flow into the inside of the photocatalyst 18.

  As described above, in the present invention, the photocatalyst body has a plurality of cylindrical base members as the respective stepped portions, and the photocatalyst body has a plurality of cylindrical shapes in which the opening cross-sectional area gradually decreases from the ballast water inlet to the ballast water outlet. By adopting a structure in which the base materials are arranged sequentially, the ballast water is irradiated with ultraviolet rays evenly and sufficiently, and directly contacted with the photocatalyst, to aquatic species such as aquatic organisms and bacteria existing in the ballast water, Organized to discharge to the outside from the cylindrical base material that constitutes the photocatalyst in order from the killed species, giving sufficient damage until killing, and killed species However, it is possible to sufficiently kill and sterilize aquatic species such as aquatic organisms and bacteria existing in the ballast water without interfering with the reaction of unreacted species and without leaking.

  Therefore, utilization as a ballast water treatment apparatus for ships is expected.

DESCRIPTION OF SYMBOLS 1 Ship 2 Port 3 Waterline 4 Sea chest 5 Switching valve 7 Switching valve 8 Inlet 9 Pump 10 Ballast tank 11 Outlet 12 Ballast water treatment device 13 Pretreatment device 14 Ballast water treatment tank 15 Control panel 16 Ballast water inlet 17 Ultraviolet lamp DESCRIPTION OF SYMBOLS 18 Photocatalyst body 19 Ballast water outlet 20 Switching valve 21 Switching valve 22 Cleaning liquid tank 23 Cleaning liquid pump 24 Top cover 25 Support body 26 Current plate

Claims (11)

A cylindrical ballast water treatment tank having a ballast water inlet on one end and a ballast water outlet on the other end;
Ultraviolet irradiation means provided detachably in the longitudinal direction of the ballast water treatment tank;
A baffle plate provided between the ballast water inlet and the ultraviolet irradiation means;
A photocatalyst body detachably provided in the ballast water treatment tank,
The photocatalyst is directed from the ballast water inlet to the ballast water outlet,
A ballast water treatment apparatus having a configuration in which a plurality of cylindrical base materials whose opening cross-sectional area gradually decreases are sequentially arranged. The ballast water treatment tank is placed upright, the ballast water inlet is located on the lower end, and the ballast water outlet is located on the upper end.
The ballast water treatment apparatus according to claim 1. The cylindrical base material constituting the photocatalyst body is a cylindrical shape,
The ballast water treatment apparatus according to claim 1 or 2. One end of the ultraviolet irradiation means is fixed to the detachable upper cover of the ballast water treatment tank, and the photocatalyst is fixed apart from the upper cover by a plurality of supports.
The ballast water treatment apparatus according to claim 2 or 3. The photocatalyst is directed from the ballast water inlet to the ballast water outlet,
The first-stage cylindrical base material, the second-stage cylindrical base material, and the third-stage cylindrical base material having a gradually decreasing opening cross-sectional area are arranged and configured.
From the first gap formed between the inner surface of the first-stage cylindrical substrate and the outer surface of the second-stage cylindrical substrate,
The second gap formed between the inner surface of the second-stage cylindrical base material and the outer surface of the third-stage cylindrical base material is increased,
The ballast water treatment apparatus according to any one of claims 2 to 4. The length in the vertical direction of each step portion of the cylindrical base material constituting the photocatalyst body is shortened from the lower stage to the upper stage,
The ballast water treatment apparatus according to claim 5. The upper end of the cylindrical substrate located at the uppermost stage of the cylindrical substrate constituting the photocatalyst body is located above the lower end of the ballast water outlet,
The ballast water treatment apparatus according to claim 5 or 6. The cylindrical base materials that are continuously located one above the other are arranged such that the lower end of the cylindrical base material located in the upper stage overlaps with the upper end of the step part of the cylindrical base material located in the lower stage. It is characterized by
The ballast water treatment apparatus according to any one of claims 5 to 7. The upper end of each step portion of the cylindrical base material constituting the photocatalyst body has a shape that spreads outward in the circumferential direction,
The ballast water treatment apparatus according to any one of claims 5 to 8. It is a flat plate provided with a number of holes in the current plate,
The ballast water treatment apparatus according to any one of claims 1 to 9. The rectifying plate has an area equal to or larger than the opening cross-sectional area of the uppermost cylindrical base material, and is provided with a space between the lowermost cylindrical base materials,
The ballast water treatment apparatus according to any one of claims 5 to 10.

Images