JP6168388B2 - Ballast water treatment equipment - Google Patents

Description

  The present invention relates to a ballast water treatment apparatus in which a cylindrical filter that filters ballast water that has flowed inside to flow outside is disposed in a casing.

In a ship such as a tanker, when navigating to the destination again after unloading the crude oil etc. of the cargo, water called ballast water is usually placed in the ballast tank provided in the ship in order to balance the navigating ship. To store. Ballast water is basically taken at the loading port and discharged at the loading port, so if they are located in different locations, plankton and bacterial microorganisms contained in the ballast water will move around the world. become. Therefore, if ballast water is discharged from a loading port in a sea area different from the cargo port, microorganisms in another sea area will be released to that port, which may destroy the ecosystem in that sea area. In order to prevent the destruction of the marine environment due to this ballast water, the International Maritime Organization (IMO) has concluded a ballast water management treaty and ballast discharged to the outside of the ship as the ballast water discharge standard (D-2 standard). It regulates the content of microorganisms contained in water.
According to the ballast water discharge standard (D-2 standard), plankton of 50 μm or more (L size) is less than 10 pieces / m ³ , and plankton of 10 to 50 μm (S size) is less than 10 pieces / ml, depending on the plankton size. For bacteria, it is determined that Vibrio cholerae is less than 1 cfu / 100 ml, Escherichia coli is less than 250 cfu / 100 ml, and enterococci are less than 100 cfu / ml.

For this reason, when the ballast water is stored in the ballast tank, it is required that the microorganisms in the ballast water be killed and detoxified. Ballast water filtration by a ballast water treatment device in which a cylindrical filter that filters the ballast water that has flowed into the interior and discharges it to the outside is disposed as a means of detoxifying the microorganisms in the ballast water. In addition, there is known a processing method using ultraviolet irradiation by an ultraviolet irradiation device provided with an ultraviolet lamp that irradiates ballast water with ultraviolet rays. In the filter of the ballast water treatment device used in this treatment method, 99.99% removal performance is required for L size (50 μm or more) plankton. Need. For this reason, clogging is severe and constant filter cleaning is important.
In addition, after completion of the ballast water treatment, it is desirable that the filter disposed in the casing of the ballast water treatment apparatus is in an initial state where no foreign matter remains in preparation for the next ballast water treatment.

Conventionally, as a method for removing foreign matter accumulated on the inner surface of a filter, Patent Document 1 discloses a suction nozzle that opens at a position facing the inner surface of the filter, and the suction nozzle along the inner surface of the filter along the axial and circumferential directions of the filter. A nozzle moving means for moving both of them, a backwash nozzle that is located outside the filter and that faces the suction nozzle, and discharges backwash water, and the backwash nozzle is synchronized with the suction nozzle in the same direction. A filtration device comprising backwash nozzle moving means for moving to is described.
Cleaning of the filter by the filtration device described in Patent Document 1 is performed by opening the drainage valve when the pressure difference between the inside and outside of the filter becomes equal to or higher than a predetermined pressure during continuous filtration. While moving the backwashing nozzle, backwashing water is discharged from the backwashing nozzle, the suspended matter accumulated on the filter is removed with washing water, and the mud is discharged from the suction nozzle.

JP 2004-141785 A

  In the filtration device described in Patent Document 1 described above, backwash water is discharged from the backwash nozzle while filtration is continued, so the backwash water discharged from the backwash nozzle becomes a resistance to the filtrate in the filtrate chamber. There is a problem that the momentum attenuates and the cleaning effect falls. Further, there is no filter cleaning mechanism after completion of the filtration operation, and therefore, when a suspended matter remains in the filter, a troublesome work such as manually cleaning the filter with a brush after completion of the filtration operation is required. There is a problem. Also, if the suspended matter accumulated on the filter during filtration cannot be removed by washing with the backwash water discharged from the backwash nozzle, the filtration operation is interrupted and the filter is manually removed using a brush. There is a problem that annoying work such as cleaning is required.

  An object of the present invention is to provide a ballast water treatment apparatus capable of efficiently and effectively cleaning a filter in a state where a ballast water treatment operation is stopped.

To achieve the above object, a first aspect of the present invention, ballast water treatment which is disposed a cylindrical filter for discharging the ballast water flowing into the interior of the filter filtration to the outside of the filter into the casing A filter rotating means for rotating the filter about its axis; a drain means for discharging water in the casing; and a secondary side which is an outer peripheral surface side of the filter, A high-pressure fluid jetting means for jetting high-pressure fluid toward the outer peripheral surface of the basin, and when the ballast water treatment operation is stopped, the drainage valve of the drainage means is opened, and the filter is rotated by the filter rotating means, while the filter is rotated by the high-pressure fluid jetting means. The ballast water treatment apparatus includes a control unit that ejects a high-pressure fluid toward an outer peripheral surface of the filter.

According to the invention described in claim 1, open the drain valve of the water discharge means at the time of the ballast water treatment operation is stopped while rotating the filter by the filter rotating means, on the outer peripheral surface of the filter by high pressure fluid jetting means By ejecting the high-pressure fluid toward the surface, the foreign matter deposited on the inner peripheral surface of the filter can be peeled off and removed by the high-pressure fluid ejected.
The ejection of high pressure fluid by the high pressure fluid jetting means, is performed to open the drain valve of the drainage means, the jet of high pressure fluid is injected in a space without water, of the filter as it momentum during ejection since striking the outer peripheral surface, the foreign matter deposited on the inner peripheral surface of the filter can be reliably separated and removed.

The invention according to claim 2 is the ballast water treatment apparatus according to claim 1 , wherein the high-pressure fluid is clean water.

According to the second aspect of the present invention, since the high-pressure fluid is clean water, there is no possibility that foreign matter will newly accumulate on the inner peripheral surface and outer peripheral surface of the filter.

A third aspect of the present invention is the ballast water treatment apparatus according to the first aspect, wherein the high-pressure fluid is high-pressure air.

According to invention of Claim 3 , since the said high pressure fluid is high pressure air, use of precious clean water can be suppressed in a ship.

The invention according to claim 4 is the ballast water treatment apparatus according to any one of claims 2 and 3 , wherein the ejection of the high-pressure fluid is performed after discharging the water in the casing.

According to the invention described in claim 4, wherein the ejection of high pressure fluid, is performed after discharging the water in the casing, the high pressure fluid, that in all ejection time as the momentum corresponds to the outer peripheral surface of the filter Therefore, the foreign matter accumulated on the inner peripheral surface of the filter can be reliably peeled off and removed in a short time.

The invention according to claim 5 is the ballast water treatment apparatus according to claim 3 , wherein the ejection of the high-pressure fluid is performed while discharging the water in the casing.

According to the invention described in claim 5 , when the high-pressure fluid is high-pressure air, the ejection of the high-pressure fluid is performed while discharging the water in the casing. The foreign matter accumulated on the inner peripheral surface of the filter in the space formed in order from the upper space toward the lower direction is peeled off, and the peeled foreign matter falls into the water in the filter, and this water is discharged. Accordingly, since it is removed from the inside of the filter, it is possible to suppress the use of clean water as much as possible when removing the foreign matter peeled off from the inner peripheral surface of the filter.

  According to the ballast water treatment apparatus of the present invention, when the filter is washed after ballast water treatment or foreign matter accumulated on the filter during ballast water treatment operation increases, the pressure loss in the filter increases. The filter can be efficiently and effectively washed with the ballast water treatment operation stopped, and the filter can be returned to the initial state.

It is a schematic sectional explanatory drawing which shows the 1st example of embodiment of the ballast water treatment apparatus which concerns on this invention. It is a schematic sectional explanatory drawing which shows the 2nd example of embodiment of the ballast water treatment apparatus which concerns on this invention. It is explanatory drawing which shows an example of the arrangement position of the high pressure fluid ejection means provided in the primary side and secondary side of the filter of the 2nd example.

Hereinafter, an example of an embodiment of a ballast water treatment apparatus according to the present invention will be described in detail with reference to the drawings.
First, a first example of an embodiment of a ballast water treatment apparatus according to the present invention will be described with reference to FIG. FIG. 1 is a schematic cross-sectional explanatory view of this example.

  The ballast water treatment apparatus of the present example is disposed in a cylindrical casing 1, and filters the ballast water flowing into the inside (hereinafter referred to as treated water before filtration and treated water after filtration) to the outside. The cylindrical filter 2 that flows out into the filter, the filter rotating means 3 that rotates the filter 2 around its axis, the drainage means 4 that discharges the water in the casing 1, and backwashing during the ballast water treatment operation. A backwashing mechanism 35, a high pressure fluid jetting means 6 provided on the secondary side of the filter 2 for jetting high pressure fluid toward the outer peripheral surface of the filter 2, and a drain valve 7 of the draining means 4 when the ballast water treatment operation is stopped. Control means 8 is provided for opening the high pressure fluid toward the inner and outer peripheral surfaces of the filter 2 by the high pressure fluid ejecting means 6 while rotating the filter 2 by the filter rotating means 3.

Specifically, the casing 1 is formed in a cylindrical shape, and an upper opening is sealed with a lid 9 and a lower opening is sealed with a bottom 10. The lid portion 9 is provided with an air vent valve 11 that vents air from the casing 1.
A cylindrical filter 2 disposed in the casing 1 has an upper opening sealed with an upper closing part 12, and a lower opening with a lower closing part 13 and a lower rotating shaft member 14 described later, the casing 1 and the filter 2. Is separated from the treated water outflow space 15 side. The filter 2 preferably has a structure in which a filter body such as a metal mesh formed in a cylindrical shape is sandwiched between a support body formed in a cylindrical shape with two thin metal plates provided with a large number of holes. The structure which provided the filter body in the outer peripheral surface of the support body which formed the metal thin plate which provided this in the cylindrical shape may be sufficient.

  The filter rotating means 3 for rotating the filter 2 is provided on the upper closing portion 12 of the filter 2 and provided on the upper rotating shaft member 16 provided to project in the axial direction at the axial center position of the filter 2 and on the lower closing portion 13. The lower rotating shaft member 14 and a motor 17 that transmits the rotation to the upper rotating shaft member 16 and rotates the filter 2.

The upper rotary shaft member 16 passes through the lid portion 9 of the casing 1 and is rotatably and liquid-tightly supported by the lid portion 9 via a sealed bearing member 18. The lower rotary shaft member 14 is supported by the bottom portion 10 of the casing 1. And is supported rotatably and liquid tightly on the bottom 10 through a sealed bearing member 19.
The lower rotating shaft member 14 is a tubular body that communicates with the inside of the filter 2, and the treated water inlet 20 of the casing 1 is connected to the lower rotating shaft member 14 that protrudes out of the casing 1 from the bottom 10 of the casing 1. ing. A treated water introduction path 21 is connected to the treated water introduction port 20. The treated water introduction path 21 is provided with a pump 22 that pumps treated water and an on-off valve 23 that is located downstream of the pump 22. A drainage channel 24 is connected to the treated water introduction channel 21 on the downstream side of the on-off valve 23, a drainage valve 7 is provided in the drainage channel 24, and water in the casing 1 is drained by the drainage channel 24 and the drainage valve 7. A draining means 4 for discharging is configured.

  A treated water outlet 25 is provided on the side of the casing 1, and the treated water flowing through the treated water introduction passage 21 and introduced from the treated water introduction port 20 passes through the lower rotary shaft member 14 and enters the filter 2. Then, it passes through the filter 2, is filtered, enters the treated water outflow space 15 formed between the casing 1 and the filter 2, and flows out from the treated water outlet 25.

Further, in the backwash mechanism 35, a suction nozzle 36 that opens toward the filter 2 at a position facing the inner peripheral surface of the filter 2 and sucks foreign matter accumulated on the inner peripheral surface of the filter 2 together with the treated water; The cleaning sewage discharging means 37 for discharging the cleaning sewage sucked by the suction nozzle 36 to the outside.
The suction nozzle 36 is opened at a position that does not reach the ejection region of the high-pressure fluid ejection nozzle 27 that opens toward the inner and outer peripheral surfaces of the filter 2. Further, the suction nozzle 36 is in close contact with the inner surface of the filter 2 so that the opening is slidable.

The cleaning sewage discharging means 37 is connected to the suction nozzle 36, is connected to the cleaning sewage collecting pipe 38 where the cleaning sewage sucked by the suction nozzle 36 is collected, and the cleaning sewage is connected to the cleaning sewage collecting pipe 38 and discharges the cleaning sewage to the outside. A discharge pipe 39 and an on-off valve 40 provided in the cleaning sewage discharge pipe 39 are configured.
The cleaning sewage collecting pipe 38 is disposed at the axial center of the filter 2, has an upper end closed and a lower end opened, and the upper end is in a hole provided in the center of the upper closing part 12 of the filter 2. 41 is fitted. Further, the lower end portion of the cleaning sewage collecting pipe 38 passes through the lower rotary shaft member 14 of the lower closing portion 13 of the filter 2 so as not to prevent the rotation of the filter 2 and is fixed to the treated water inlet 20 of the casing 1. It is supported. The on-off valve 40 provided in the cleaning sewage discharge pipe 39 connected to the lower end of the cleaning sewage collecting pipe 38 constituting the cleaning sewage discharge means 37 is always open during operation.

Further, in this example, a washing water ejection nozzle 42 that ejects washing water toward the suction nozzle 36 is provided on a side portion of the casing 1 at a position facing the suction nozzle 36 and opens into the casing 1. In the ballast water treatment operation, when the differential pressure between the primary side and the secondary side of the filter rises to a predetermined differential pressure or more, the pressure is increased toward the suction nozzle 36.
In this example, the treated water supplied to the washing water ejection nozzle 42 is treated water treated by the filter 2, and one end of the washing water supply path 43 is connected to the treated water outlet 25 of the casing 1. The other end is connected to the treated water passage 44 and the other end is connected to the washing water jet nozzle 42, and the treated water treated by the filter 2 is supplied to the washing water jet nozzle 42 through the washing water supply passage 43. . The cleaning water supply passage 43 is provided with a pump 45 that pumps treated water to the cleaning water ejection nozzle 42, and an open / close valve 46 on the upstream side of the pump 45.

In the high pressure fluid ejection means 6 provided on the secondary side of the filter 2, the high pressure fluid ejection nozzle that opens toward the outer peripheral surface of the filter 2 and ejects the high pressure fluid in the entire axial direction of the filter 2. 27, and the high-pressure fluid ejection means 6 is further equipped with a high-pressure fluid supply means 28 for supplying a high-pressure fluid to the high-pressure fluid ejection nozzle 27.
The configuration of the high-pressure fluid ejection nozzle 27 is not particularly limited as long as it can be ejected over the entire axial direction of the filter 2. For example, a plurality of high-pressure fluid ejection nozzles 27 may be arranged in a linear or circumferential direction in the axial direction of the filter 2 so as to be ejected over the entire axial direction of the filter 2.

In this example, clean water is used as the high-pressure fluid supplied to the high-pressure fluid ejection nozzle 27. As clean water, drinking water, water produced by a water generator, water filtered by a ballast water treatment device, treated water filtered by a ballast water treatment device were further filtered with a 10 μm non-woven fabric, etc. Is used.
In the high-pressure fluid supply means 28 for supplying clean water to be high-pressure fluid, a tank 29 storing clean water and a high-pressure fluid ejection nozzle 27 are connected by a clean water supply path 31, and the clean water in the tank 29 is connected. Is pumped to the high-pressure fluid ejection nozzle 27 by a pump 32. An opening / closing valve 34 is provided in the clean water supply path 31.

The control means 8 also has a function of opening the drain valve 7 of the drainage means 4 when the ballast water treatment operation is stopped, a function of driving the motor 17 to rotate the filter 2, and a high-pressure fluid ejection nozzle 27 of the high-pressure fluid ejection means 6. Has a function of ejecting a high-pressure fluid from the nozzle.
The operation of the ballast water treatment apparatus of this example configured as described above will be described.
When water injection into the ballast tank is completed by the operation of the ballast water treatment device that performs water treatment while the filter 2 is backwashed by the backwash mechanism 35, or when the pressure loss of the filter 2 rises above the allowable pressure loss, the pump 22 is turned on. The on / off valve 23 is closed, and the on / off valve 40 provided on the cleaning wastewater discharge pipe 39 is kept open while the filter 2 continues to rotate. In this state, the air vent valve 11 is opened, the drain valve 7 provided in the drain passage 24 is opened, and the water in the casing 1 is discharged.
When a certain time has elapsed, the pump 32 is started, the open / close valve 34 is opened, and the high pressure fluid is ejected from the secondary side high pressure fluid ejection nozzle 27 toward the outer peripheral surface of the filter 2. When a predetermined time elapses in a state in which high pressure fluid is ejected from the high pressure fluid ejection nozzle 27, the on-off valve 34 is closed to stop ejection of the high pressure fluid from the high pressure fluid ejection nozzle 27, the drain valve 7 is closed, and the filter 2 is rotated. Stop and exit.

Thus, according to the ballast water treatment apparatus of this example, the drainage valve 7 of the drainage means 4 is opened when the ballast water treatment operation is stopped, and the filter 2 is rotated by the filter rotation means 3 while the filter is rotated by the high pressure fluid ejection means 6. toward the outer circumferential surface of the two stripping the foreign matters deposited on the inner circumferential surface of the filter 2 by jetting clean water as a high pressure fluid, moreover, the ejection of the clean water by the high-pressure fluid jetting means 6, the water Since the gas is ejected in a space that does not exist, it strikes the outer peripheral surface of the filter 2 with the momentum at the time of ejection, so that the foreign matter accumulated on the inner peripheral surface of the filter 2 can be reliably peeled off and removed.

In this example, clean water is used as the high-pressure fluid supplied to the high-pressure fluid ejection nozzle 27, but the high-pressure fluid may be high-pressure air. In this case, the high-pressure fluid supply means supplies high-pressure air to the high-pressure fluid ejection nozzle 27 by an air compressor (not shown).
When the high-pressure fluid is high-pressure air, the high-pressure fluid can be ejected while discharging the water in the casing 1, so that in order from the upper space formed by discharging the water in the casing 1 toward the lower direction. Foreign matter accumulated on the inner peripheral surface of the filter 2 in the space to be formed is peeled off, and the peeled foreign matter can fall into the water in the filter 2 and be removed from the filter 2 as the water is discharged. it can.

Next, a second example of the embodiment of the ballast water treatment apparatus according to the present invention will be described with reference to FIGS. FIG. 2 is a schematic cross-sectional explanatory view of this example, and FIG. 3 is an explanatory view showing an arrangement position of high-pressure fluid ejection means provided on the primary side and secondary side of the filter.
About the ballast water treatment apparatus of this example, the same code | symbol is attached | subjected and demonstrated about the structure same as a 1st example.
Also, the difference between this example and the first example is that, in this example, the high pressure fluid ejection means 6 is provided on the secondary side of the filter 2, and the high pressure fluid ejection means 5 is also provided on the primary side of the filter 2. Since the other configuration is the same as the first example, only the configuration different from the first example will be described, and the description of the first example will be used for the other configuration.
The ballast water treatment apparatus of this example is provided on the primary side and the secondary side of the filter 2, and high-pressure fluid ejection means 5 and 6 that eject high-pressure fluid toward the inner peripheral surface and the outer peripheral surface of the filter 2, and ballast water When the processing operation is stopped, the drain valve 7 of the drain means 4 is opened, and the high pressure fluid is ejected toward the inner and outer peripheral surfaces of the filter 2 by the high pressure fluid ejecting means 5 and 6 while the filter 2 is rotated by the filter rotating means 3. Control means 8 is provided.

In the high pressure fluid ejection means 5, 6 provided on the primary side of the filter 2, the high pressure fluid ejection nozzle that opens toward the inner peripheral surface of the filter 2 and ejects the high pressure fluid in the entire axial direction of the filter 2. In addition, the high-pressure fluid ejection means 5 and 6 are provided with a common high-pressure fluid supply means 28 for supplying a high-pressure fluid to the high-pressure fluid ejection nozzles 26 and 27.
The high-pressure fluid jet nozzle 26 provided on the primary side and opening toward the inner peripheral surface of the filter 2 and the high-pressure fluid jet nozzle 27 provided on the secondary side and opening toward the outer peripheral surface of the filter 2 have both jet regions. It arrange | positions so that it may not overlap (refer FIG. 3). The configuration of the high-pressure fluid ejection nozzles 26 and 27 is not particularly limited as long as the high-pressure fluid ejection nozzles 26 and 27 can be ejected over the entire axial direction of the filter 2. For example, a plurality of high-pressure fluid ejection nozzles 26 and 27 may be arranged in a linear or circumferential direction in the axial direction of the filter 2 so as to be ejected over the entire axial direction of the filter 2.

In this example, clean water is used as the high-pressure fluid supplied to the high-pressure fluid ejection nozzles 26 and 27 as in the first example.
In the high-pressure fluid supply means 28 for supplying clean water as a high-pressure fluid, the tank 29 storing the clean water and the high-pressure fluid ejection nozzles 26 and 27 are connected by the clean water supply passages 30 and 31, and the tank 29 The clean water inside is pumped to the high-pressure fluid jet nozzles 26 and 27 by a pump 32. The clean water supply passages 30 and 31 are provided with on-off valves 33 and 34, respectively, and the timing of supplying clean water to the high-pressure fluid ejection nozzles 26 and 27 can be adjusted by controlling the opening and closing of the on-off valves 33 and 34. It is like that.

Further, the control means 8 of this example includes a function of opening the drain valve 7 of the drainage means 4 when the ballast water treatment operation is stopped, a function of driving the motor 17 to rotate the filter 2, and the high-pressure fluid ejection means 5, 6. The high-pressure fluid ejection nozzles 26 and 27 have a function of ejecting high-pressure fluid.
In the function of ejecting high-pressure fluid from the high-pressure fluid ejection nozzles 26, 27, the opening / closing valves 33, 34 provided in the clean water supply passages 30, 31 are controlled to open and close, and the secondary-side high-pressure fluid ejection nozzle 27 is controlled. The high pressure fluid is ejected from the secondary side high pressure fluid ejection nozzle 27 and then the high pressure fluid is ejected from the primary side high pressure fluid ejection nozzle 26; After the high pressure fluid is ejected from the ejection nozzle 27 for a certain period of time, the high pressure fluid is ejected from the primary high pressure fluid ejection nozzle 26 while continuing to eject the high pressure fluid from the secondary high pressure fluid ejection nozzle 27. And a function of selecting one of the operations for ejecting the high-pressure fluid from the primary-side and secondary-side high-pressure fluid ejection nozzles 26 and 27 at the same time.

Operation 1, operation 2, and operation 3 will be described as operation examples of the ballast water treatment apparatus of this example configured as described above.
In the operation 1, the operation 2, and the operation 3, any operation is selected when the ballast water treatment apparatus of this example is implemented.
(Operation 1)
When water injection into the ballast tank is completed by the operation of the ballast water treatment device that performs water treatment while performing backwashing by the backwashing mechanism 35, or when foreign substances accumulate on the inner peripheral surface of the filter more than a predetermined amount, the pump 22 is stopped. Then, the on-off valve 23 is closed, the filter 2 continues to rotate, and the on-off valve 40 provided on the cleaning wastewater discharge pipe 39 is opened. In this state, the air vent valve 11 is opened, the drain valve 7 provided in the drain passage 24 is opened, and the water in the casing 1 is discharged.
When a certain time has elapsed, the pump 32 is started, the open / close valve 34 is opened, and the high pressure fluid is ejected from the secondary side high pressure fluid ejection nozzle 27 toward the outer peripheral surface of the filter 2. When a predetermined time elapses with the high pressure fluid ejected from the high pressure fluid ejection nozzle 27, the on-off valve 34 is closed to stop the ejection of the high pressure fluid from the high pressure fluid ejection nozzle 27, and the on-off valve 33 is opened to open the primary side high pressure fluid. High pressure fluid is ejected from the ejection nozzle 26 toward the inner peripheral surface of the filter 2. When a predetermined time elapses in a state in which the high pressure fluid is ejected from the high pressure fluid ejection nozzle 26, the open / close valve 33 is closed, the pump 32 is stopped, the drain valve 7 is closed, and the rotation of the filter 2 is stopped.

(Operation 2)
As in the operation 1, when the ballast water treatment apparatus that performs water treatment while performing the backwashing by the backwashing mechanism 35 is completed, water injection into the ballast tank is completed, or when foreign matters accumulate on the inner peripheral surface of the filter more than a predetermined amount. Then, the pump 22 is stopped, the open / close valve 23 is closed, the filter 2 continues to rotate, and the open / close valve 40 provided in the cleaning wastewater discharge pipe 39 is opened. In this state, the air vent valve 11 is opened, the drain valve 7 provided in the drain passage 24 is opened, and the water in the casing 1 is discharged.
When a certain time has elapsed, the pump 32 is started, the open / close valve 34 is opened, and the high pressure fluid is ejected from the secondary side high pressure fluid ejection nozzle 27 toward the outer peripheral surface of the filter 2. When a predetermined time elapses in a state where the high-pressure fluid is ejected from the high-pressure fluid ejection nozzle 27, the on-off valve 33 is opened while continuing the ejection of the high-pressure fluid from the secondary high-pressure fluid ejection nozzle 27, and further, the primary high-pressure fluid is ejected. A high-pressure fluid is ejected from the fluid ejection nozzle 26 toward the inner peripheral surface of the filter 2. When a predetermined time elapses in this state, the on-off valves 33 and 34 are closed, the pump 32 is stopped, the drain valve 7 is closed, the rotation of the filter 2 is stopped, and the process is ended.

(Operation 3)
As in the operation 1, when the ballast water treatment apparatus that performs water treatment while performing the backwashing by the backwashing mechanism 35 is completed, water injection into the ballast tank is completed, or when foreign matters accumulate on the inner peripheral surface of the filter more than a predetermined amount. Then, the pump 22 is stopped, the on-off valve 23 is closed, the rotation of the filter 2 is continued, and the on-off valve 40 provided in the cleaning sewage discharge pipe 39 is opened. In this state, the air vent valve 11 is opened, the drain valve 7 provided in the drain passage 24 is opened, and the water in the casing 1 is discharged.
When a certain time has elapsed, the pump 32 is started, the on-off valves 33 and 34 are opened, and high-pressure fluid is directed from the primary-side high-pressure fluid ejection nozzle 26 and the secondary-side high-pressure fluid ejection nozzle 27 toward the inner and outer peripheral surfaces of the filter 2. Erupt. When a predetermined time elapses in this state, the on-off valves 33 and 34 are closed, the pump 32 is stopped, the drain valve 7 is closed, the rotation of the filter 2 is stopped, and the process is ended.

  As described above, according to the ballast water treatment apparatus of this example, the high pressure fluid ejecting means 5 and 6 are opened while the drain valve 7 of the drain means 4 is opened and the filter 2 is rotated by the filter rotating means 3 when the ballast water treatment operation is stopped. By ejecting clean water as a high-pressure fluid toward the inner and outer peripheral surfaces of the filter 2, the foreign matter accumulated on the inner peripheral surface of the filter 2 is peeled off, and the high-pressure fluid ejecting means 5 and 6 Since clean water is ejected in a space where there is no water, the clean water is ejected from the inner peripheral surface and the outer peripheral surface of the filter 2 with the same momentum at the time of ejection. It is possible to reliably peel and remove the foreign matter.

DESCRIPTION OF SYMBOLS 1 Casing 2 Filter 3 Filter rotation means 4 Drain means 5, 6 High pressure fluid ejection means 7 Drain valve 8 Control means 9 Cover part 10 Bottom part 11 Air vent valve 12 Upper closing part 13 Lower closing part 14 Lower rotary shaft member 15 Outflow of treated water Space 16 Upper rotary shaft member 17 Motors 18 and 19 Bearing member 20 Water to be treated inlet 21 Water to be treated inlet 22 Pump 23 On-off valve 24 Drainage passage 25 Treated water outlet 26 and 27 High pressure fluid ejection nozzle 28 High pressure fluid supply means 29 Tanks 30, 31 Clean water supply path 32 Pumps 33, 34 On-off valve 35 Backwash mechanism 36 Suction nozzle 37 Washing sewage discharge means 38 Washing sewage collecting pipe 39 Washing sewage discharge pipe 40 Opening / closing valve 41 Bearing member 42 Washing water jet nozzle 43 Washing Water supply path 44 Treatment water path 45 Pump 46 On-off valve

Claims (5)

A cylindrical filter for discharging the ballast water flowing into the interior of the filter filtration to the outside of the filter a ballast water treatment system arranged in the casing,
A filter rotating means for rotating the filter around its axis; a drain means for discharging water in the casing; and a secondary side which is an outer peripheral surface side of the filter, and directed toward the outer peripheral surface of the filter. High pressure fluid jetting means for jetting high pressure fluid, and when the ballast water treatment operation is stopped, the drainage valve of the drainage means is opened, and the filter is rotated by the filter rotating means, and the outer peripheral surface of the filter is rotated by the high pressure fluid jetting means. A ballast water treatment apparatus comprising control means for ejecting high-pressure fluid toward The ballast water treatment apparatus according to claim 1, wherein the high-pressure fluid is clean water. The ballast water treatment apparatus according to claim 1, wherein the high-pressure fluid is high-pressure air. The ballast water treatment apparatus according to any one of claims 2 and 3 , wherein the high-pressure fluid is ejected after discharging water in the casing. The ballast water treatment apparatus according to claim 3 , wherein the high-pressure fluid is ejected while discharging water in the casing.

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