JP2006272147A - Ballast water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ballast water treatment apparatus of high efficiency having a microorganism sterilizing capacity equivalent to a pumping capacity of a pump injecting ballast water into a ballast tank. <P>SOLUTION: This ballast water treatment apparatus sterilizes microorganisms contained in ballast water injected into the ballast tank. The apparatus is provided with a jet flow generating means 8 in a water injection pipe 15 extending from a ballast water intake port 15 to the ballast tank 2, having a water-jetting nozzle 17 jetting the ballast water c to form a jet stream and an impact plate 18 generating cavitation by impingement of the jet stream; an ozone injection means 9 injecting ozone b to the ballast water having passed through the jet flow generating means; a static mixing means 10 mixing the ozone with the ballast water; and means 11, 36 and 40 separating or adsorbingly separating residual ozone remaining in the ballast water having passed through the static mixing means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ballast water treatment apparatus that kills microorganisms such as plankton and bacteria contained in ballast water when ballast water is injected into a ballast tank.

  By discharging the ballast water contained in the ship's ballast tank to the outside of the ship, microorganisms such as plankton and bacteria contained in the ballast water will flow out of the ship, and the effects of water contamination such as these microorganisms will be affected. In order to suppress the expansion, conventionally, measures have been taken to replace the ballast water injected into the ship's ballast tank in coastal waters where there are relatively many microorganisms once on the ocean with relatively few microorganisms. .

  This is intended to suppress the expansion of the influence of microorganisms by discharging ballast water with relatively few microorganisms injected on the ocean when discharging ballast water on the coast or the like.

  However, even if the ballast water is replaced on the ocean in this way, the microorganisms in the ballast tank cannot be completely discharged, and the microorganisms remain in the ballast tank.

  For this reason, even if ocean water with relatively few microorganisms is injected into the ballast tank, it is difficult to suppress the expansion of the influence of the microorganisms when the microorganisms remain in the ballast tank. Therefore, it is considered to kill microorganisms remaining in the ballast tank.

As a method of killing microorganisms remaining in the ballast tank, after discharging the ballast water in the ballast tank, the seawater pumped up as ballast water is heated using engine cooling water, and this heated seawater is By injecting into the ballast tank and stretching it to the bottom of the ballast tank, or by spraying it toward the side wall of the ballast tank, the microorganisms that have settled on the bottom of the ballast tank or adhered to the wall surface are killed by heat. It has been proposed. (For example, refer to Patent Document 1).
JP-A-8-91288

  Since the above method can kill microorganisms using waste heat from a waste heat source, there is an excellent effect that energy consumed for killing microorganisms can be suppressed.

  However, when ocean water is introduced as ballast water after killing microorganisms remaining in the ballast tank, if the microorganisms are contained even in ocean water with relatively few microorganisms, the ballast water is discharged due to the discharge of the ballast water. In some cases, microorganisms will be released to the sea area where the effluent was discharged, and expansion of the influence of microorganisms may not be suppressed.

  Therefore, in the method as disclosed in Patent Document 1, microorganisms remaining in the ballast tank can be killed after discharging the ballast water, but the microorganisms contained in the ballast water itself cannot be killed. For this reason, the expansion of the influence of microorganisms may not be suppressed.

  Thus, even if a method like patent document 1 is used, since water pollution may expand, the ballast water treatment which can kill the microorganisms contained in the ballast water stored in the ballast tank A device is needed.

In particular, according to an agreement signed by the International Maritime Organization (IMO), by 2009, the number of microbes such as zooplankton and phytoplankton contained in ballast water should be reduced to less than 10 / m ^3. It is necessary to control the number of bacteria such as bacteria to less than 10 / cc.

  On the other hand, for example, in the case of a 300,000 ton vessel, about 100,000 ton of ballast water is required. If 100,000 ton of seawater is poured into a ballast tank within 24 hours, about 3000 ton / min. Two large pumps with capacity are required.

  Therefore, two high-performance ballast water treatment apparatuses that can kill microorganisms such as plankton and bacteria contained in seawater pumped at a rate of about 3000 tons / minute are required as ballast water treatment apparatuses. .

  The present inventor has intensively studied to solve such problems, and has reached the present invention. The first object of the present invention is to provide ballast water that can clear the reference value concluded by the IMO. It is to provide a processing apparatus.

  A second object of the present invention is to provide a high-performance ballast water treatment apparatus having a microorganism killing ability equivalent to the pumping ability of a pump for injecting ballast water into a ballast tank.

  In order to solve the above problems, the present invention is configured as follows.

  The ballast water treatment device according to the invention described in claim 1 is a ballast water treatment device that kills microorganisms contained in the ballast water to be injected into the ballast tank, and is provided from the ballast water intake to the ballast tank. In the middle of the water pipe, a water jet nozzle that forms the ballast water as a jet, a jet generating means having an impact plate that hits the jet and generates cavitation, and an ozone injection means that injects ozone into the ballast water that has passed through the jet generating means And static mixing means for mixing the ozone and the ballast water, and means for separating or adsorbing and separating the residual ozone remaining in the ballast water that has passed through the static mixing means. .

  The ballast water treatment apparatus according to claim 2 is a cyclone type ozone separation tank in which the means for separating the residual ozone generates a swirl flow in the ballast water.

  The ballast water treatment apparatus according to the invention of claim 3 is an ozone adsorption separation tank in which the means for adsorbing and separating the residual ozone contains activated carbon.

  The ballast water treatment apparatus according to a fourth aspect of the present invention is the ozone decomposition zone in which the means for separating the residual ozone generates turbulent flow in the ballast water by the turbulent flow generator filled in the pipe.

  The ballast water treatment device according to the invention of claim 5 is a ballast water treatment device that kills microorganisms contained in the ballast water to be injected into the ballast tank, and is provided from the ballast water intake to the ballast tank. An ozone injection means for injecting ozone into the ballast water in the middle of the water pipe, a water injection nozzle for forming the ballast water after the injection of ozone into a jet, and a jet generating means having an impact plate for generating cavitation when the jet hits. Static mixing means for mixing ozone and ballast water after passing through the jet generating means, and means for separating or adsorbing and separating residual ozone remaining in the ballast water that has passed through the static mixing means. It is characterized by providing.

  In the ballast water treatment apparatus according to the sixth aspect of the invention, the means for separating the residual ozone is a cyclone type ozone separation tank that generates a swirling flow in the ballast water.

  In the ballast water treatment apparatus according to claim 7, the means for adsorbing and separating the residual ozone is an ozone adsorption separation tank in which activated carbon is incorporated.

  The ballast water treatment apparatus according to an eighth aspect of the present invention is the ozone decomposition zone in which the means for separating the residual ozone generates turbulent flow in the ballast water by a turbulent flow generator filled in the pipe.

  As described above, the invention described in claim 1 is a ballast water treatment device that kills microorganisms contained in ballast water to be injected into the ballast tank, and is a water injection pipe extending from the ballast water intake port to the ballast tank. In the middle of the above, a water jet nozzle that forms the ballast water as a jet, a jet generating means having an impact plate that hits the jet and generates cavitation, and an ozone injection means that injects ozone into the ballast water that has passed through the jet generating means The present invention is characterized in that there is provided a static mixing means for mixing the ozone and the ballast water, and a means for separating or adsorbing and separating the residual ozone remaining in the ballast water that has passed through the static mixing means.

  When a rapid flow is generated by forming a turbulent flow by the water jet nozzle, cavitation occurs and destroys and kills microorganisms such as plankton in the ballast water. In addition, when ballast water is transferred from the water injection pipe to the water injection nozzle by driving the pump, it collides with the impact plate, sudden pressure change such as high pressure due to jet flow, negative pressure, and sudden impact due to collision with the impact plate. The impact plate and friction force destroy and kill microbes bubbles and cell walls such as plankton contained in the ballast water.

  Thereafter, ozone is injected into the ballast water from the ozone injection means behind the jet generating means. The ballast water into which ozone has been injected is stirred by a static mixer on the downstream side of the ozone injection means, and the ballast water and ozone are uniformly stirred and mixed. The ballast water in which ozone is uniformly stirred and mixed by the static mixer is introduced into the ozone separation tank and becomes a swirling flow. Meanwhile, the cell membranes of microorganisms such as plankton and bacteria contained in the ballast water are destroyed by ozone and die.

  The ballast water that has flowed into the ozone separation tank, which is the residual ozone separation means, forms a swirling flow along the inner wall surface of the separation tank body. You can earn reaction time of ozone to kill. In addition, unreacted or residual ozone in the ballast water can be easily separated. Further, unreacted or residual ozone separated from the ballast water in the ozone separation tank is discharged out of the system through the exhaust pipe, so that ozone does not flow into the ballast tank.

Therefore, the number of microorganisms such as plankton contained in the ballast water is suppressed to less than 10 / m ³ and the number of bacteria such as bacteria is less than 10 / cc. It becomes possible to suppress.

  On the other hand, when the residual ozone separation means is an ozone adsorption separation tank, residual ozone remaining in the ballast water can be adsorbed and separated by activated carbon in the ozone adsorption separation tank.

  In the case of an ozone decomposition zone where the residual ozone separation means generates turbulent flow in the ballast water by the turbulent flow generator filled in the pipe, the turbulent flow is generated in the ballast water by the turbulent flow generator filled in the pipe. The separation of residual ozone can be promoted.

The ballast water treatment device according to the invention of claim 5 is a ballast water treatment device that kills microorganisms contained in the ballast water to be injected into the ballast tank, and is provided from the ballast water intake to the ballast tank. An ozone injection means for injecting ozone into the ballast water in the middle of the water pipe, a water injection nozzle for forming the ballast water after the injection of ozone into a jet, and a jet generating means having an impact plate for generating cavitation when the jet hits. Static mixing means for mixing ozone and ballast water after passing through the jet generating means, and means for separating or adsorbing and separating residual ozone remaining in the ballast water that has passed through the static mixing means. As in the first aspect of the present invention, it is less than the standard value agreed by the IMO, that is, a micro-product such as plankton contained in ballast water. The number of the suppressing the 10 months less than / m ^3, but the number of bacteria, such as bacteria can be suppressed to 10 months less than / cc, cavitation in the jet flow generating means provided on the downstream side of the ozone injection means When generated, the diffusion and mixing of ozone injected from the ozone injection means is promoted, so that there is an effect that killing of microorganisms such as plankton and bacteria is more effectively performed.

  Furthermore, when the residual ozone separation means is an ozone separation tank, since the ballast water forms a swirling flow along the inner wall surface of the separation tank body, the passage time of the ballast water passing through the separation tank body becomes long, and microorganisms The reaction time of ozone that kills water can be increased, while unreacted or residual ozone in the ballast water can be easily separated. Further, unreacted or residual ozone separated from the ballast water in the ozone separation tank is discharged out of the system through the exhaust pipe, so that ozone does not flow into the ballast tank.

  On the other hand, when the residual ozone separation means is an ozone adsorption separation tank, residual ozone remaining in the ballast water can be adsorbed and separated by activated carbon in the ozone adsorption separation tank.

  In the case of an ozone decomposition zone where the residual ozone separation means generates turbulent flow in the ballast water by the turbulent flow generator filled in the pipe, the turbulent flow is generated in the ballast water by the turbulent flow generator filled in the pipe. The separation of residual ozone can be promoted.

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

  As shown in FIGS. 1 (a) and 1 (b), the bulk carrier 1 has a plurality of ballast tanks 2 along the ship side, and a plurality of boats 3 arranged in the bow-stern direction at the center of the hull. ing. This bulk carrier 1 includes a superstructure 5 above an engine room 4.

  The ballast water treatment device mounted on the bulk carrier 1 has two cases: the case where the ozone injection nozzle 9 is located in front of the jet flow generating device 8 and the case where the ozone injection nozzle 9 is located behind the jet flow generating device 8. 9 will be described in order from the case behind the jet flow generator 8.

(1) First Embodiment First, a first ballast water treatment apparatus according to the present invention will be described.

  As shown in FIG. 2, the bulk carrier 1 separates the interior 2 a of the ballast tank 2 and the engine room 4 by a partition wall 6. Further, the ballast tank 2 is provided with a package case 7 in its inside 2a. And in the inside 7a of the package case 7, a jet generating device 8 as a jet generating means, an ozone injection nozzle 9 as an ozone injecting means, a static mixer 10 as a static mixing means, and an ozone separation tank 11 are provided. Contained.

  Further, a manhole 12 is provided between the partition wall 6 and the package case 7 so that the engine room 4 and the interior 7a of the package case 7 can freely come and go.

  As shown in FIG. 2, a ballast pump 14 and a water injection pipe 15 are installed on the ship bottom 13. The water injection pipe 15 has one end connected to a ballast water intake 16 provided on the ship bottom 13 and the other end reaching the ballast tank 2.

  In the middle of the water injection pipe 15, a jet generating device 8, an ozone injection nozzle 9, a static mixer 10, and an ozone separation tank 11 are arranged in this order from the ballast pump 14 toward the ballast tank 2. Yes.

  Next, the jet flow generator 8, the ozone injection nozzle 9, the mixer 10, and the ozone separation tank 11 will be described.

(A) Jet generation device The jet generation device 8 includes a water injection nozzle 17 and an impact plate 18 as shown in FIG.

  The shape of the water jet nozzle 17 is not particularly limited, but a form having a throttle portion 19 and an expanded portion 20 as in the illustrated example is preferable. The water flowing through the water injection pipe 15 is once squeezed by the throttle portion 19, and then the water flow is jetted by the expanding portion 20. That is, a jet is formed. In this form, the throttle portion 19 is the starting point of the jet.

  The impact plate 20 is in contact with the support substrate 29 and is sandwiched between the support members 30 provided on the support substrate 29. The impact plate 20 is preferably formed in, for example, a square shape (for example, a square shape) and detachably fixed. Note that the support member 30 is not necessarily provided because of the jet pressure in the direction of water flow.

  The size of the impact plate 20 is preferably formed to be smaller than the inner diameter of the water injection pipe 15 so that water can pass from the outer periphery or from the top and bottom (or from the left and right). The support substrate 29 is formed with a gap 35 for allowing water that has passed from the outer periphery or top and bottom (or left and right) of the impact plate 20 to flow to the right water injection pipe 15 in the drawing. 39 is a reducer.

  The distance between the throttle portion, which is the starting point of the jet formed by the water injection nozzle 17, and the impact plate 18 is appropriately set so that killing due to cavitation and impact occurs effectively.

  In the above embodiment, cavitation can be generated when a sudden pressure change is applied by forming a jet flow with the water injection nozzle, so that microorganisms such as plankton in the ballast water are destroyed and killed.

  Further, when the ballast water is transferred from the water injection pipe 15 to the water injection nozzle 17 by driving the pump 14 at, for example, 20 to 30 m / sec, the ballast water hits the impact plate 18 and suddenly has high pressure and negative pressure due to the jet flow. The air bubbles and the cell walls of microorganisms such as plankton contained in the ballast water are destroyed and killed by the pressure change and the sudden impact plate and frictional force caused by the collision with the impact plate 18.

  The jet generating device 8 is not limited to the above-described mode, and may increase the effect of cavitation by making a plurality of nozzles face each other or have an angle. Further, by making the surface shape of the impact plate concave or uneven, it is possible to increase the effect of cavitation in the same manner, and the killing effect can be enhanced as the cavitation effect increases.

(B) Ozone injection nozzle The ozone injection nozzle 9 is for injecting ozone b into the ballast water in the water injection pipe 15. As shown in FIG. 2, the ozone injection nozzle 9 is an L-shaped nozzle that is inserted into the water injection pipe 15 from the side wall of the water injection pipe 15, and from a large number of fine holes (not shown) provided on the end face thereof. Ozone is ejected into fine bubbles.

  Here, the ozone dissolution concentration in the ballast water in the water injection pipe 15 is preferably in a high concentration range of 1 to 200 ppm.

  In the drawing, reference numeral 21 denotes an ozone generator, and ozone b generated by the ozone generator 21 is supplied to the ozone injection nozzle 9 through a pipe 22.

The principle of ozone generation is as follows.
3O ₂ → 2O ₃ +0.82 kWh / kg-O ₃
Here, 0.82 kWh / kg is a theoretical value.
O ₂ → 2O, O + O ₂ → O ₃

(C) Static mixer As the static mixer, a static mixer having a twisted cross plate or cross body structure is adopted. Here, the function when the OHR line mixer is employed is shown.

  The static mixer 10 includes a guide vane chamber 23 and a current cutter chamber 24 behind the guide vane chamber 23 as shown in FIG. In the guide vane chamber 23, two guide vanes 25 are installed in an X shape (side view). Each of the guide vanes 25 and 25 has a substantially elliptical shape divided into two along its long axis, and the circumferential portion 25a is fixed to the inner wall surface 23a of the cylindrical guide vane chamber 23. ing.

  In the current cutter chamber 24, a large number of current cutter groups 26 are arranged at a predetermined interval in the front-rear direction. Each current cutter group 26 is provided with a large number of current cutters (also referred to as colliding bodies) 28 formed in a saw-tooth shape from the tube wall 27 toward the center of the tube.

  FIG. 10B is an explanatory diagram of the operation of the static mixer. When a ballast water c containing microorganisms such as plankton and bacteria and ozone is supplied to the static mixer 10 as indicated by the arrows, the ballast water c is obtained. The two guide vanes 25 in the guide vane chamber 23 are converted into a helical spiral flow d.

  When this spiral flow d flows from the guide vane chamber 23 into the current cutter chamber 24, the ballast water c and the ozone and microorganisms (not shown) mixed in the ballast water c have a large number of mushroom-shaped currents. Collides with the cutter 28 and mixes more uniformly. For this reason, the degree of contact between ozone and microorganisms is dramatically improved, and the degree of killing of microorganisms by ozone is increased.

(D) Ozone separation tank As shown in FIG. 2, the ozone separation tank 11 is composed of a tank-shaped main body 31 and an inner cylinder 32 provided on the axial center thereof. The water injection pipe 15 on the upstream side is connected to the side of the main body 31 in a tangential direction like a cyclone so that the seawater flowing into the main body 31 forms a swirling flow e along the inner wall surface of the main body 31. It has become.

  For this reason, the passage time of the ballast water which passes the inside of the separation tank main body 31 becomes long, and the reaction time of ozone which kills microorganisms can be earned. In addition, unreacted ozone in the ballast water can be easily separated.

  On the other hand, the main body 31 is connected to the water injection pipe 15 on the downstream side. Further, the main body 31 is provided with an exhaust pipe 33 for discharging ozone separated from the ballast water in the main body 31. Further, an ultraviolet lamp 34 is inserted into the inner cylinder 32 to finally kill microorganisms in the ballast water. The ultraviolet lamp 34 promotes the decomposition of ozone and can enhance the sterilizing power by the effect of oxygen radicals generated at that time. The ballast water c finally processed by the ultraviolet lamp 34 is supplied into the ballast tank 2 through the water injection pipe 15 on the downstream side.

  Next, the operation of the first ballast water treatment apparatus will be described with reference to FIG.

When the ballast pump 14 is operated to pump up the ballast water c, the ballast water c is injected into the ballast tank 2 through the water injection pipe 15. As already described, since the ballast water c contains microorganisms such as plankton and bacteria, these microorganisms are killed and the number thereof is below the standard value agreed by the IMO, that is, It is necessary to suppress the number of microorganisms such as plankton contained in the ballast water to less than 10 / m ^{3 and} to suppress the number of bacteria such as bacteria to less than 10 / cc.

  As described above, the first ballast water treatment apparatus is composed of the jet flow generating device 8, the ozone injection nozzle 9, the static mixer 10, and the ozone separation tank 11. In the jet flow generating device 8, As described in the above section (a), when a rapid flow is generated by forming a turbulent flow by the water injection nozzle 17, cavitation occurs and microorganisms such as plankton in the ballast water c are destroyed and killed. Be destroyed.

  Further, when the ballast water c is transferred from the water injection pipe 15 to the water injection nozzle 17 by driving the pump 14, it collides with the impact plate 18, a rapid pressure change such as a high pressure due to the jet flow, a negative pressure, and the impact plate. Air bubbles and cell walls of microorganisms such as plankton contained in the ballast water c are destroyed and killed by the abrupt impact plate and frictional force caused by the collision with the material 18.

  Next, ozone b is injected into the ballast water from the ozone injection nozzle 9 located behind the jet flow generator 8. The ballast water c into which the ozone b has been injected is stirred by the static mixer 10 located on the downstream side of the ozone injection nozzle 9, and the ballast water c and the ozone b are uniformly stirred and mixed.

  The mixture of ballast water and ozone that is uniformly stirred and mixed by the static mixer 10 is introduced into the ozone separation tank 11 to form a swirling flow e. Meanwhile, the cell membranes of microorganisms such as plankton and bacteria contained in the ballast water are destroyed by ozone and die. Unreacted or residual ozone b is separated from the ballast water c and discharged out of the system through the exhaust pipe 33.

The ballast water c from which microorganisms such as plankton and bacteria have been killed and ozone b has been removed flows upward from the lower end portion of the inner cylinder 32 provided in the main body 31 of the ozone separation tank 11. Further sterilization is performed by the ultraviolet lamp 34 while passing through the inner cylinder 32 of the tank 11. The ballast water c sterilized by the ultraviolet lamp 34 is injected into the ballast tank 2 from the water injection pipe 15 on the downstream side.
(2) Second Embodiment FIG. 3 is a configuration diagram of a second ballast water treatment apparatus according to the present invention.

  This second ballast water treatment apparatus is provided with an ozone adsorption / decomposition tank 36 in the injection pipe 15 on the downstream side of the ozone separation tank 11, and the other devices are the first ballast water already described. Since it is the same as the processing apparatus, the same device as the device of the first embodiment is denoted by the same reference numeral, and detailed description thereof is omitted.

  The ozone adsorption / decomposition tank 36 has a cylindrical main body 37 filled with activated carbon 38 such as granular activated carbon or felt-like activated carbon, and remains in the ballast water by the activated carbon 38 filled in the main body 37. Ozone is actively decomposed to reduce the residual ozone concentration to zero.

(3) Third Embodiment FIG. 4 is a configuration diagram of a third ballast water treatment apparatus according to the present invention.

  In the third ballast water treatment apparatus, the jet generation means 8, the ozone injection nozzle 9, and the static mixer 10 that have already been described are arranged in this order, and an ozone adsorption separation tank is further provided behind the static mixer 10. 36 is provided.

  The ozone adsorption separation tank 36 is a cylindrical main body 37 filled with activated carbon 38 such as granular activated carbon or felt-like activated carbon, and remains in the ballast water by the activated carbon 38 filled in the main body 37. Ozone is actively decomposed to reduce the residual ozone concentration to zero.

  The other devices are the same as those of the first ballast water treatment apparatus already described, and thus the same devices as those of the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

(4) Fourth Embodiment FIG. 5 is a configuration diagram of a fourth ballast water treatment apparatus according to the present invention.

  In the fourth ballast water treatment apparatus, the jet generation means 8, the ozone injection nozzle 9, and the static mixer 10 that have already been described are arranged in this order, and the ozone decomposition zone 40 is further disposed behind the static mixer 10. Is provided.

  This ozonolysis zone 40 is obtained by filling a tubular body 41 with a turbulent flow generator 42 such as a ring shape or a horseshoe shape, and generating turbulent flow in the ballast water by the turbulent flow generator 42 filled in the tubular body 41. By doing so, ozone remaining in the ballast water is actively decomposed so that the residual concentration of ozone becomes zero.

  The other devices are the same as those of the first ballast water treatment apparatus already described, and thus the same devices as those of the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

Next, the case where the ozone injection nozzle 9 is in front of the jet flow generator 8 will be described.
(5) Fifth Embodiment FIG. 6 is a configuration diagram of a fifth ballast water treatment apparatus according to the present invention.

  This fifth ballast water treatment device is one in which the ozone injection nozzle 9 is provided on the upstream side of the jet flow generating device 8, and the other equipment is the same as the first ballast water treatment device already described. The same reference numerals are assigned to the same devices as those in the first embodiment, and detailed descriptions thereof are omitted.

  In this embodiment, when cavitation occurs in the jet generating means 8 provided downstream of the ozone injection nozzle 9, the diffusion and mixing of the ozone b injected from the ozone injection nozzle 9 is promoted. There is an effect that killing of microorganisms such as is performed more effectively.

Similar to the second ballast water treatment device, the ozone adsorption / decomposition tank 36 is provided in the injection pipe 15 on the downstream side of the ozone separation tank 11, so that the activated carbon 38 filled in the ozone adsorption / decomposition tank 36 is ballasted. The ozone remaining in the water can be actively decomposed to make the residual concentration of ozone zero.
(6) Sixth embodiment

  FIG. 7 is a configuration diagram of a sixth ballast water treatment apparatus according to the present invention.

  In the sixth ballast water treatment apparatus, the ozone injection nozzle 9, the jet generating means 8, and the static mixer 10 that have already been described are arranged in this order, and the ozone adsorption separation tank is further provided behind the static mixer 10. 36 is provided.

  The ozone adsorption separation tank 36 is a cylindrical main body 37 filled with activated carbon 38 such as granular activated carbon or felt-like activated carbon, and remains in the ballast water by the activated carbon 38 filled in the main body 37. Ozone is actively decomposed to reduce the residual ozone concentration to zero.

  The other devices are the same as those of the first ballast water treatment apparatus already described. Therefore, the same devices as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

(7) Seventh Embodiment FIG. 8 is a block diagram of a seventh ballast water treatment apparatus according to the present invention.

  In the seventh ballast water treatment apparatus, the ozone injection nozzle 9, the jet generating means 8, and the static mixer 10 that have already been described are arranged in this order, and the ozone decomposition zone 40 is further disposed behind the static mixer 10. Is provided.

  The ozonolysis zone 40 is a tube body 41 filled with a turbulent flow generator 42 such as a ring shape or a horseshoe shape, and remains in the ballast water by the turbulent flow generator 42 filled in the tube body 41. The ozone concentration is actively decomposed to reduce the residual ozone concentration to zero.

  The other devices are the same as those of the first ballast water treatment apparatus already described. Therefore, the same devices as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

(A) It is a schematic block diagram of the bulk carrier which has a ballast tank, (b) It is a cross-sectional view of a bulk carrier. It is a block diagram of the 1st ballast water treatment apparatus which concerns on this invention. It is a block diagram of the 2nd ballast water treatment apparatus which concerns on this invention. It is a block diagram of the 3rd ballast water treatment apparatus which concerns on this invention. It is a block diagram of the 4th ballast water treatment apparatus which concerns on this invention. It is a block diagram of the 5th ballast water treatment apparatus which concerns on this invention. It is a block diagram of the 6th ballast water treatment apparatus which concerns on this invention. It is a block diagram of the 7th ballast water treatment apparatus which concerns on this invention. It is sectional drawing of a jet flow generation means. (A) Cross-sectional view of the mixer, (b) is an explanatory diagram of the operation of the mixer.

Explanation of symbols

c Ballast water 2 Ballast tank 8 Jet generation means 9 Ozone injection means 10 Static mixing means 11, 40 Ozone separation means 15 Water injection pipe 16 Ballast water intake 17 Water injection nozzle 18 Impact plate 36 Ozone adsorption separation means

Claims (8)

A ballast water treatment device for killing microorganisms contained in ballast water to be injected into a ballast tank, wherein the water injection nozzle forms a jet of the ballast water in the middle of a water injection pipe extending from the ballast water intake port to the ballast tank. And jet generating means having an impact plate that hits the jet to generate cavitation, ozone injecting means for injecting ozone into the ballast water that has passed through the jet generating means, and static mixing means for mixing the ozone and ballast water And a means for separating or adsorbing and separating residual ozone remaining in the ballast water that has passed through the static mixing means. The ballast water treatment apparatus according to claim 1, wherein the means for separating the residual ozone is a cyclone type ozone separation tank for generating a swirling flow in the ballast water. The ballast water treatment device according to claim 1, wherein the means for adsorbing and separating the residual ozone is an ozone adsorption separation tank containing activated carbon. The ballast water treatment apparatus according to claim 1, wherein the means for separating the residual ozone is an ozone decomposition zone in which turbulent flow is generated in the ballast water by a turbulent flow generator filled in the pipe. A ballast water treatment device that kills microorganisms contained in ballast water to be injected into the ballast tank, and injects ozone into the ballast water in the middle of the water injection pipe from the ballast water intake to the ballast tank. Means, a water jet nozzle that forms a ballast water after injecting the ozone, and a jet generating means having an impact plate that hits the jet to generate cavitation, and ozone and ballast water after passing through the jet generating means. A ballast water treatment apparatus comprising: a static mixing unit for mixing; and a unit for separating or adsorbing and separating residual ozone remaining in the ballast water that has passed through the static mixing unit. The ballast water treatment apparatus according to claim 1, wherein the means for separating the residual ozone is a cyclone type ozone separation tank for generating a swirling flow in the ballast water. The ballast water treatment device according to claim 1, wherein the means for adsorbing and separating the residual ozone is an ozone adsorption separation tank containing activated carbon. The ballast water treatment apparatus according to claim 1, wherein the means for separating the residual ozone is an ozone decomposition zone in which turbulent flow is generated in the ballast water by a turbulent flow generator filled in the pipe.

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