KR20110066985A - Ballast water treatment system with filtering apparatus including inner and outer filtering layers - Google Patents

Abstract

PURPOSE: A ship ballast water processing apparatus is provided to improve the processing effect on marine microorganisms in ballast water by pre-processing seawater, and to prevent the secondary problem of a ballast water tank by the microorganisms. CONSTITUTION: A ship ballast water processing apparatus comprise an influx unit filtering device installed on an influx pipe(10) for inflowing seawater. The influx unit filtering device includes a cylindrical filtering frame, an upper cap(20) formed on the upper side of the filtering frame, and an outer pipe(30) and an inner pipe(40) formed inside the filtering frame. An inner pipe filtering layer(42) and an outer pipe filtering layer(32) are inserted into the inner pipe and the outer pipe, respectively.

Description

Ballast water treatment system with filtering apparatus including inner and outer filtering layers

The present invention relates to a ballast water treatment apparatus for treating seawater used as ballast water, and more specifically, the inside of the ballast water is suitable for filtration treatment of the marine microorganisms in the step of entering the ballast water tank or discharged out of the ship A ballast water treatment apparatus for treating ballast water by filtering and separating marine microorganisms in ballast water by providing a cylindrical filtration frame composed of a pipe filtration layer and an outer pipe filtration layer.

It is known that 80% of the goods produced on earth are moved internationally by ships, and about 3 to 5 billion tons of seawater is moved internationally by ships every year. Due to the international movement of goods by ships, foreign marine microorganisms attached to the outside of the ship or contained in ballast water threaten the local marine ecosystem. This influx of exotic marine microorganisms through each pathway is one of the threats to marine ecosystems, and is taken more seriously than marine pollution in the simple sense of disrupting the marine ecosystem's food chain and possibly extinct native species. have.

Ballast water is an essential element for maintaining the stability of the ship.If ballast water is small, such as probes or warships, the amount of ballast water is small. It is relatively large. In general, ballast water is stored in ballast water storage tanks in proportion to the amount of cargo discharged in order to prevent the stability of the ship due to the increase in the center of gravity of the ship due to the buoyancy. On the contrary, when loading a ship, ballast water is discharged, and the discharge is also proportional to the load of the ship. As mentioned above, the ballast water problem, which is essential for the operation of the ship, has not been transferred to the problem of marine microbial system included in the ballast water due to the increase in international trade volume.

Therefore, it is necessary to look at this in detail. Marine or other microbial species from the discharge of ballast water are naturally indigenous to the waters, and spread to neighboring waters as a result of vigorous breeding when adapted to the environment of the discharge area. Therefore, depending on the situation, the balance between exotic and indigenous species can be balanced, and the ecosystem of the sea area can have big change caused by the food chain. Therefore, the change of fish species will have a decisive influence on the economic aspects as well as on the production of marine products. do. In conclusion, the influx of foreign marine microbial species leads to undesired changes in marine ecosystems, and thus our lives are greatly affected.

For reference, phytoplankton, protozoan plankton, epiphytoplankton, and other plankton which are marine microbial species in ballast waters from New Zealand, Taiwan, Hong Kong, Singapore, North Pacific, Pakistan and Japan, etc. When classified into species, genus, or higher class, the total number of taxa ranges from 7 to 53. On the other hand, the total number of marine microorganisms classified (170 phytoplankton: stony and flagella algae and other 90, phytoplankton 56, and protozoal plankton 24) (Yoo et al. 2006). Each microorganism in the ballast water can be seen as a distribution according to the intake water, but since the ballast water exchange is not completely replaced, they exist in a mixed state. The use of such marine microorganisms as treatment targets to kill and treat microorganisms in ballast water will yield more valuable and useful results.

In order to prevent the ecological and economic damage caused by such ballast water movements and to preserve biodiversity, the International Maritime Organization (IMO) announced in February 2004 that 'the control and management of ballast water and sediment International convention '. In addition, by the end of 2016, ships engaged in international navigation are mandatory to have a ballast water treatment system.

Most of the ballast water treatment technology researched or patented until recently, especially the filtration device, is composed of a complicated structure, which seems to be insufficient in use after installation. Therefore, from the management point of view of the filtering device, it should be examined how efficient and economical in time and space. In particular, when the filtration device is applied, since the cleaning of the device is very important, a satisfactory cleaning method is required again. Therefore, by suggesting a new filtration device is to propose a filtration method that is easy to operate and wash the device.

In addition, most of the ballast water treatment technologies applied until recently are generally treated directly in ballast water tanks in which seawater is stored. Therefore, since the undesirable phenomenon that marine microorganisms contained in seawater actively breed and grow in the ballast water tank occurs, pretreatment technology for marine microorganisms is necessary and very important. This is because the growth and reproduction of marine microorganisms can cause secondary disturbance problems. In addition, since the total amount of marine microorganisms is naturally regulated in advance, the subsequent killing process of marine microorganisms can be facilitated more easily and effectively.

Accordingly, an object of the present invention is to provide a ballast water pretreatment apparatus using an filtration device that is suitable and suitable for removing marine microorganisms contained in seawater before seawater flows into a ballast water tank and becomes ballast water.

In addition, another object of the present invention is not only easy when the seawater inlet filtration device is washed, but also treated as ballast water to clean the ballast water discharged by being used as the discharge filtration device to discharge the treated ballast water. To provide a device.

It is still another object of the present invention to provide a ballast water treatment apparatus for treating ballast water by effectively filtering and separating marine microorganisms in ballast water by applying a filtration device in stages.

In addition, another object of the present invention is to provide a ballast water treatment apparatus that can be easily separated and washed.

In addition, another object of the present invention is to provide a ballast water treatment apparatus that can easily remove the marine microorganisms separated by filtration.

The present invention provides a ballast water treatment apparatus using a filtration device for treating ballast water by providing a plurality of filtration network to solve the above problems. That is, the present invention, when storing the seawater taken as ballast water in the ballast water tank in order to maintain the ballasting of the vessel, marine microorganisms in the ballast water, especially marine microorganisms having a size of 50㎛ or more It is to provide a ballast water pretreatment device for removing the. Its features include an inlet filtration device which is installed in an inlet pipe for introducing seawater to the ballast water treatment tank, wherein the inlet filtration device is a cylindrical filter housing and an interior inside the cylindrical filtration frame. The tube and the outer tube are composed. Inside the inner tube and the outer tube is formed a filtration layer consisting of a plurality of filter mesh of stainless steel 316L material of the mesh (mesh) of 1 mm or less scale, in particular the outer tube is hollow in the center of the circle, That is, the hollow is formed inside the inner tube to pass through the hollow, consisting of a plurality of mesh (mesh) filter layer to maximize the removal and separation of marine microorganisms. In addition, the filtration layer is configured in the form of a package (package) to embody the ease of being easily mounted and separated in the filtration device, that is, the inside of the inner tube and the outer tube.

In the event that ballast water is to be discharged, filtering the ballast water discharged is to effectively remove the remaining marine microorganisms. In other words, the present invention is to be installed in the discharge pipe for discharging the ballast water from the ballast water tank to install a filtration device of the same structure as that installed when the seawater is introduced to be used as the discharge unit filtration device (II). Therefore, the goal of discharged ballast water is to finally aim for complete removal of marine microorganisms.

The outer tube filter layer formed in the outer tube is one of the features of the present invention is a structure consisting of a plurality of filter nets, the material of the filter net is typically stainless steel 316L of 45㎛ scale size. Preferably, the outer tube filtration layer is composed of three to ten filtering nets, each of which is composed of two meshes, front and rear, and is designed to withstand pressure therebetween. The filtering network removes in advance marine microorganisms of 50 µm or more in seawater to be used as ballast water.

On the other hand, the inner tube filtration layer formed in the inner tube is composed of a plurality of similar filtering nets similar to the outer tube, the material of the filter net is generally stainless steel 316L of 10㎛ graduation size, preferably the inner The tube filtration layer consists of 3 to 10 filter nets. And each of the filtering nets designed in the pressure-bearing structure in the middle is made of two meshes, front and back, by passing the seawater first filtered from the outer pipes through the filtering nets in the denser inner tube, The marine microorganisms in the seawater used as the ballast water can be controlled to 10㎛. In addition, each of the filter nets in the form of a package (package) to be more easily mounted and detached to the cylindrical filter frame, which allows more efficient maintenance of the filter device. In addition, the volume ratio of the inner tube and the outer tube is 1.00 to 1.20, the ratio is variable according to the flow rate control.

And an upper cap is provided on the upper end of the cylindrical filtration frame of the inlet filtration device or the outlet filtration device, the inverted Y-shaped pressure control connector is introduced into the upper cap to face the inner tube filtration layer have. The pressure adjusting connector is a place where a control device (for example, a pressure needle valve type) for controlling a back pressure generated between the filtration layer and the filtration layer inside the filtration device is connected during the filtration operation. Compressed air is used to control the internal pressure of the filtration device to increase the filtration effect. The pressure adjusting connector is more preferably used when washing the filtration device. That is, by installing an inverted Y-shaped tube installed in the upper cap of the upper end of the filtration device to face the filtration layer of the inner tube, it serves to adjust the pressure when filtration and the filtration layer during filtration. It can also be used to inhale and remove marine microorganisms on the net.

Next, the filtration layer washing of the inner tube and the outer tube will be described in detail. The filter bed wash sprays fresh water at a pressure of 5 atm or lower from the ballast water tank towards the inner tube. The filter net is then released from the body in the fresh water direction, leaving marine microbes and other debris out of the wall where the filter net is attached. The same phenomenon occurs in the filtration layer of the outer tube. In conclusion, the washing of the filtration layer is to remove the filtration residues generated in the process of filtering the marine microorganisms when the seawater is introduced. In other words, the cleaning of the filtration system is judged by measuring the pressure change between the inside and outside of the pipe, with fresh water in the opposite direction to the inlet of the ballast water tank, followed by compressed air. It is possible by circulation. In addition, the cleaning process is carried out by making the diameter of the screening net and the filtering net immediately after the netting the same, and making the diameter of the filtering net after that smaller than the filtering net next to the netting at a predetermined interval, for example, 50 mm. Residues of marine microorganisms thus removed naturally flow down through the space to be hardened. In particular, by installing the inverted Y-shaped pressure control connector facing the inner tube filtration layer, it acts as a pressure adjustment when filtration, and when washing to remove and remove the marine microorganisms caught in the filtration layer net during filtration. Make it available. In addition, the inner tube can be rotated left and right during the cleaning of the filtration apparatus so that the removal of the microscopic marine microorganisms left by filtration can be easily and effectively achieved. The end point of the washing is determined by measuring the change in pressure.

The inner tube filter layer and the outer tube filter layer replacement method is as follows. That is, the upper cap of the upper part of the filtration frame and the pressure adjusting connector are simultaneously lifted up to a convenient height using a crane, and then the inner tube filtration layer is first mounted or separated, and then the outer tube filtration layer is mounted or separated. . Therefore, each of the filtration layers must be assembled before use, which is one way to make the individual cleaning or replacement quick and easy.

In the ballast water treatment method using the filtration device according to the present invention, the seawater is passed through the inlet filtration device before the water is introduced into the ballast water tank as the ballast water, thereby pretreating the seawater to treat the marine microorganisms in the ballast water. At the same time, there is an advantage of preventing the failure of the secondary ballast water tank in which marine microorganisms grow and multiply in the ballast water tank when seawater is introduced without being filtered.

In addition, according to the present invention, since the marine microorganisms in the ballast water discharged to the outside is completely processed by using the discharge part filtration device even when discharged ballast water can be said to be a more effective ballast water treatment device.

In addition, according to the present invention, since each of the filtration layers has a package-shaped partition structure that is easy to install and detach, it is another advantage of the present invention that maintenance is very quick and easy, such as cleaning and replacing the filtration device. Can be.

Hereinafter, with reference to the accompanying drawings will be described in detail the ballast water treatment apparatus using a filtration device according to an embodiment of the present invention.

1 is a block diagram of a ballast water treatment device according to a preferred embodiment of the present invention, Figure 2 is a view for explaining the inlet filtration device of the ballast water treatment device according to a preferred embodiment of the present invention, 3 is a view for explaining the inlet filtration device shown in FIG. The ship is equipped with a ballast water tank (1) in order to maintain the stability, the ballast water is stored in the ballast water tank (1). As shown in FIG. 1, the ballast water is introduced into the ballast water tank 1 through the inlet pipe 10 as needed, and discharged to the outside through the discharge pipe 12. That is, the inlet pipe 10 is a passage through which seawater is introduced, and the ballast water tank 1 is a place where ballast water flowing through the inlet pipe 10 is stored in various sizes according to the amount of drainage of the ship. Can be installed. In addition, a ballast water treatment tank may be installed in the ballast water tank 1 or a ballast water treatment tank may be separately installed.

Ballast water treatment device using a filtration device according to a preferred embodiment of the present invention is a device installed in the vessel to remove the marine microorganisms contained in the sea water, the inlet filtration device in the inlet pipe 10 through which the sea water flows It is to combine (I) appropriately. In addition, the ballast water treatment device using a filtration device according to a preferred embodiment of the present invention is coupled to the discharge pipe connected to the ballast water tank (1) discharge portion filtering device for treating the ballast water discharged to the outside of the vessel ( II).

In other words, the inlet filtration device I is a device for filtering and separating marine microorganisms in ballast water before seawater is converted to ballast water and introduced into the ballast water tank 1. The inlet filtration device (I) comprises a cylindrical filter housing (cylindrical filter housing, 10) and the upper cap 20 is configured on the top of the cylindrical filter frame (10), the cylindrical filter frame (10) ) Inside is composed of an outer tube 30 and the inner tube (40). The outer tube 30 is a structure in which the hollow is formed inside the inner tube 40, that is, the diameter of the inner tube 40 in the middle, the outer tube filter layer 32 is configured have. In addition, the lower side of the outer tube 30 is configured with an inlet 16 through which seawater flows. The outer tube filtering layer 32 is composed of a plurality of outer tube filtering nets 32a made of stainless steel 316L, which is a mesh of 1 mm or less. The outer tube filter net (32a) is composed of a plurality, for example, may be composed of five outer tube filter net. Accordingly, the seawater introduced through the inlet 16 passes through the second outer tube filter net, the third outer tube filter net, the fourth outer tube filter net and the fifth outer tube filter net, starting from the first outer tube filter net, and finally 5 The seawater passing through the outer tube filtering net is transferred to the inner tube 40 having a volume of about 20% larger than that of the outer tube 30. That is, the seawater passing through the outer tube 30 in the upper cap 20 changes in direction and flows into the inner tube 40.

The inner tube 40 has a structure in which an inner tube filtration layer 42 is formed therein, and the inner tube filtration layer 42 is made of stainless steel (316L) that is a mesh having a mesh scale of 1 mm or less. It consists of a plurality of inner tube filter network (42a) (42b) (42c) (42d), these inner tube filter network comprises a first inner tube filter network (42a), a second inner tube filter network (42b), a third inner tube filter network It consists of 42c and the 4th inner tube filter network 42d. The seawater passing through the fourth inner pipe filtration network 42d flows into the ballast water tank 1.

And the inlet 16 and the pressure control connector 50 of the outer tube 30 is formed with a protective net for the protection of the filter layer. For example, a protective net 44 is formed at the lower portion of the pressure control connector 50, that is, at the beginning of the inner tube filtration layer 42. In addition, each of the filtration layers and the filter net is packaged, which is very convenient for cleaning or replacement work. This will be described later in detail.

The outer tube filter net (32a) is one of the features of the present invention consists of two pieces of the front and rear and the structure is to prevent deformation in the inside, that is made of a structure that can withstand the pressure in a structure such as a truss, The material of the tube strainer 32a is typically 316L stainless steel (sus) with a scale of 45 μm. Preferably, the outer tube filtration layer 32 is composed of three to ten of the above-described filtration nets, wherein marine microorganisms of 50 μm or more existing in the seawater to be used as ballast water are allowed to pass through the filtration layer 32 in advance. It is filtered and separated off.

The inner tube 40 in the inlet filtration unit I and the outlet filtration unit II is similar in structure to the outer tube 30 except that the function of the filtering network is different from that of the outer tube 30. . The material of the filter net is typically stainless steel (sus) 316L with a scale size of 10 μm. Preferably, the inner tube filtration layer 42 is composed of three to ten of the above-described filter nets 42a, 42b, 42c and 42d, which exactly correspond to the hollows formed in the outer tube 30. Marine microorganisms of 10 µm or more in seawater to be used as ballast water are filtered and separated in advance by passing the seawater through the inner tube filtration layer 40.

The inlet filtration device I is provided at the top of the cylindrical filtration frame 10 so as to adjust the back pressure generated during the filtration operation between the respective filtration layers therein and to effectively filter the same. It is highly desirable to install a pressure regulating connector 50. That is, by forming an inverted Y-shaped connection portion, that is, branch pipes 52a and 52b, which is provided in the upper cap 20 on the upper end of the cylindrical filtration frame 10, is installed toward the inner tube filtration layer 42. When filtration is to act as a pressure adjustment, and when washing it can be used to inhale and remove the marine microorganisms caught in the mesh of the inner tube filter network (42a) during filtration. In addition, the inner tube 40 may be rotated left and right during the washing of the inlet filtration device I to easily and effectively remove the micro marine microorganisms remaining filtered. The end point of the wash is determined by measuring the change in pressure.

Meanwhile, each of the outer tube filtration layer 30 and the inner tube filtration layer 40, that is, the outer tube filtration network 42a and the inner tube filtration network 32a is configured in a package form to filter the inlet portion. Since the attachment and detachment of the device I is easy, maintenance of the inlet filtration device I can be effectively performed. In addition, the filtered various residues such as marine microorganisms rotate the inner tube 40 of the inlet filtration device (I) from side to side at an appropriate time, rotating about 5 to 10 RPM, and the inner tube (40) of the inlet filtration device (I). ) It is sucked into the two branch pipes (52a) (52b) attached to the reverse Y-shaped pressure control connector 50 in the upper cap of the upper and is soon transferred to the residue storage tank (5) through the discharge pipe. Rotation direction, speed, etc. of the inner tube 40 can be arbitrarily adjusted.

On the other hand, the discharge part filtration device (II) is connected to the ballast water treatment tank (2) which is a device for sterilizing the ballast water stored in the ballast water tank (1) when the ballast water is discharged to the outside As a device for filtering ballast water, the structure of the outlet filtration device (II) is preferably equal to that of the inlet filtration device (I). Since the discharge part filtration device (II) processes only the ballast water discharged after the treatment, it is possible to more efficiently and effectively treat the ballast water. Like the seawater inlet 16, the marine microbial residue removed by the outlet filtration device (II) is transferred to the marine microbial residue storage tank (5) connected with the outlet filtration device (II) and stored thereafter. Will be processed.

Next, the filtration layer washing of the inner tube 40 and the outer tube 30 will be described in detail. The filter bed wash sprays fresh water at a pressure of 5 atm or less toward the inner tube 40 in the ballast water treatment tank 2. Then, as shown in FIG. 2, the filtering nets 42a, 42b, 42c, 42d are freed from the body in the fresh water direction, and the marine microorganisms, etc., are left out of the filtering nets 42b, 42c, 42d. This phenomenon also occurs in the filtration layer 32 of the outer tube 30. In conclusion, the washing of the filtration layer removes the filter residues generated during the filtration of marine microorganisms when seawater is introduced. In other words, the cleaning of the inlet filtration device I is judged by measuring the pressure change between the inside and the outside of the pipe, followed by fresh water in the opposite direction of the inlet of the ballast water tank 1, and then This is possible by circulating compressed air in a forced manner. For example, the diameter of the guard net 44 and the diameter of the first inner tube filter net 42a adjacent to the guard net 44 are the same, and the next filter net adjacent to the first inner tube filter net 42a ( By reducing the diameter of 42b) by a predetermined length (h2), for example, about 50 mm smaller than the filter network 42a, the residue of marine microorganisms removed as the washing proceeds is naturally flowed downward through the space. Will be. For example, the filtering nets 42b, 42c, and 42d formed inside the filtering layer 42 are arranged to form a predetermined interval h2 with the inner wall 40 of the inner tube 40. The marine microbial residues away from 42b) 42c and 42d fall down through the space created by this spacing. The same applies to the case of the outer tube 30, which means a certain interval h1 shown in FIG. In particular, two inverted Y-shaped branch pipes 52a and 52b are installed toward the inner tube filtration layer 42 in the upper cap 20 at the top of the filtration device, so as to adjust the pressure during filtration. When washing, the inner tube 40 can be rotated to the left and right during the cleaning of the filtration device to facilitate the removal of minute marine microorganisms left in the filtration process, and to effect the removal of the pressure. Decide by

How to replace the filter layers 42 and 32 of the inner tube 40 and the outer tube 30 is as follows. That is, the upper cap 20 and the pressure adjusting connector 50 at the top of the filtration device are simultaneously lifted up to a convenient height using a crane, and then the filter layer 42 of the inner tube 40 is first mounted or separated. Next, the filtration layer 32 of the outer tube 30 is installed or separated. Therefore, each of the filtration layers must be assembled before use, which is one way to make the individual cleaning or replacement quick and easy. In addition, in the inner tube filter network (42a), it is preferable that a portion and b portion is 1: 2, which is for the structural stability of the inner tube filter network (42a). Similarly, in the outer tube filter network 32a, the c portion and the d portion are preferably 1: 2.

Next, the operation and operation of the ballast water treatment method using a filtration device according to a preferred embodiment of the present invention will be discussed.

Seawater is introduced into the ballast water tank (1) through the inlet pipe 10, the seawater filtration treatment is performed in the inlet filtration device (I) immediately before entering into the ballast water tank (1). That is, while passing through the filtration layers 32 and 42 installed in the inner tube 40 and the outer tube 30 of the inlet filtration device I, the marine microorganisms in the ballast water are removed as much as possible. In particular, while the seawater passes through the filtration layer 32, it is judged that marine microorganisms of 45 µm or more and below are separated from each other, and microscopic marine microorganisms of 45 µm to 10 µm should be removed through filtration and separation. In addition, by adjusting the internal pressure of the inlet filtration device (I) through the pressure control connector 50 to increase the filtration and separation effect of marine microorganisms in the ballast water passing through the inlet filtration device (I). The ballast water in the ballast water tank (1) is sterilized and treated in the ballast water treatment tank (2) immediately before being discharged to the outside, and is discharged at the time of attempting to discharge the treated ballast water to the outside. By filtering again through (II), marine microorganisms can be completely processed. In addition, the residues of marine microorganisms obtained through the filtration process in each of the inlet filtration unit (I) and the outlet filtration unit (II) are transferred to the residue storage tank 5 and processed according to an appropriate procedure. In addition, the inner tube 40 can be rotated left and right during the cleaning of the filtration apparatus so that the removal of the microorganisms left in the filtration process can be easily and effectively achieved. The end point of the washing is determined by measuring the change in pressure.

As described above with reference to the drawings illustrating a ballast water treatment method using a special filtration device according to the present invention, the present invention is not limited by the preferred embodiments and drawings presented herein, the present invention Of course, various modifications may be made by the corresponding companies within the scope of the technical idea.

1 is a block diagram of a ballast water treatment apparatus according to a preferred embodiment of the present invention.

Figure 2 is a view for explaining the inlet filtration device of the ballast water treatment apparatus according to an embodiment of the present invention.

3 is a view for explaining in detail the inlet filtration device shown in FIG.

<Description of the symbols for the main parts of the drawings>

Ⅰ: Inlet filter Ⅱ: Outlet filter

1: ballast water tank 2: ballast water treatment tank

3: ballast water discharge tank 5: residue storage tank

6: compressed air tank 10: cylindrical filter frame

16: inlet 20: upper cap

30: outer tube 32: outer tube filtration layer

32a: outer tube filter network 40: inner tube

42: inner tube filter layer 42a, 42b, 42c, 42d: inner tube filter network

44: protection net 50: pressure control connector

52a, 52b: branch pipe

Claims (7)

In the ballast water treatment apparatus installed on the vessel to maintain the ballasting of the vessel by collecting the seawater as ballast water (ballast water) in the ballast water tank, The ballast water treatment device is made to include an inlet filtration device which is installed in the inlet pipe into which the sea water flows, The inlet filtration device comprises a cylindrical filter housing (cylindrical filter housing) and the upper cap is configured on the top of the cylindrical filter housing, the cylindrical filter housing is formed in the inner tube and the inner hollow of the outer tube An inner tube is formed, and the inner tube and the outer tube have an inner tube filtration layer and an outer tube filtration layer, respectively, One side of the cylindrical filtration frame is connected to the inlet, the seawater introduced through the inlet is introduced into the outer tube and the seawater introduced into the outer tube is changed in the direction inside the upper cap is introduced into the inner tube Ballast water treatment device characterized in that. In the ballast water treatment apparatus installed on the vessel to maintain the ballasting of the vessel by collecting the seawater as ballast water (ballast water) in the ballast water tank, The ballast water treatment device is made to include a discharge portion filtering device is installed in the discharge pipe for discharging the ballast water, The outlet filtration device comprises a cylindrical filter housing (cylindrical filter housing) and the upper cap formed on the cylindrical filter housing, the cylindrical filter housing is formed in the inner tube and the inner hollow of the outer tube An inner tube is formed, and the inner tube and the outer tube have an inner tube filter layer and an outer tube filter layer, respectively. One side of the cylindrical filtration frame is connected to the inlet port so that the ballast water introduced through the inlet is introduced into the outer tube and the ballast water introduced into the outer tube is changed in the direction inside the upper cap to the inner tube Ballast water treatment device, characterized in that the inlet.  The method according to claim 1 or 2,  The inner tube is formed with an inner tube filtration layer composed of a plurality of filter meshes of stainless steel, which are meshes having a scale of 1 mm or less, and the filter net is easily mounted to the inner tube in a package form. Ballast water treatment apparatus, characterized in that the separation.  The method of claim 3, wherein  The inner tube is a ballast water treatment apparatus, characterized in that the scale of the network is 10㎛.  The method according to claim 1 or 2,  The outer tube is formed with an outer tube filtration layer composed of a plurality of filter nets having a mesh size of 45 μm or less, and the filter net is easily installed and separated from the outer tube in a package form. Ballast water treatment device, characterized in that the.  The method according to claim 1 or 2,  In order to adjust the pressure and the washing of the inner pipe, the ballast water treatment device is a ballast water treatment device, characterized in that the pressure adjustment connector is connected to the inner tube through the upper cap. The method of claim 1, In order to wash the inner tube, the inner ballast ballast water treatment device, characterized in that rotated in a predetermined number of turns alternately in the left and right directions.

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