JP2019122952A - Liquid treatment apparatus - Google Patents

Abstract

To provide a liquid treatment apparatus capable of suppressing generation of vibration.SOLUTION: A water treatment apparatus 1 includes a filter 20 formed cylindrically, a drain pipe part 42 arranged inside the filter 20, a nozzle part 41 in which the base end side is connected to the drain pipe part 42, and the tip side is arranged on a position close to or abutting on the inner peripheral surface of the filter 20 and opened, and water can be circulated from the tip side to the base end side, and a gas introduction part 70 for introducing gas into at least either of the drain pipe part 42 and the nozzle part 41.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a liquid processing apparatus.

  Conventionally, in ships such as tankers, after unloading crude oil of cargo, etc., when navigating to a destination again, ballast water is called in a ballast tank provided on the ship to balance the ship under navigation Retain water. Ballast water is basically taken at the unloading port and discharged at the loading port. Therefore, plankton and bacteria that are contained in ballast water will move around the world if their location is different. Therefore, if ballast water is discharged at a loading port in a different sea area from the loading port, the microbes of another sea area will be released to the port, which may destroy the ecosystem in the sea area.

  In order to remove foreign substances such as microbes, sand, and dust contained in ballast water, a ballast water treatment apparatus provided with a filter for filtering ballast water is used. As a filter used for a ballast water treatment apparatus, the cylindrical filter body by which many holes were formed in the surrounding surface is used, for example. In the ballast water treatment system, constant filter cleaning is considered important because the filter is heavily clogged.

  Then, the water treatment apparatus (ballast water treatment apparatus) which wash | cleans which removes the foreign material adhering to the primary side of a filter, while filtering with a filter is proposed (for example, refer patent document 1).

Japanese Patent Application Publication No. 2008-507391

  The ballast water treatment apparatus proposed in Patent Document 1 includes a cylindrical filter, a nozzle unit in which the tip end slidably contacts the inner surface of the filter and sucks water, and the nozzle unit is connected and water flows through the nozzle unit And a drain pipe portion for discharging the water to the outside.

  According to the above ballast water treatment apparatus, the pumped water is introduced into the inside of the cylindrical filter, and is filtered by flowing from the inside to the outside of the filter. In addition, in the portion where the tip of the nozzle portion abuts, water flows from the outer surface side to the inner surface side of the filter to separate the foreign matter attached to the inner surface of the filter. The separated foreign matter is sucked from the nozzle portion, flows to the drain pipe portion, and is discharged to the outside.

  By the way, if the amount of water drawn from the nozzle changes due to the influence of foreign matter adhering to the filter, the contact state between the nozzle and the inner surface of the filter, etc., pressure fluctuation occurs inside the nozzle and the drainage pipe . And a vibration may generate | occur | produce in the liquid treatment apparatus containing a ballast water treatment apparatus resulting from this pressure fluctuation.

  Therefore, an object of the present invention is to provide a liquid processing apparatus capable of suppressing the occurrence of vibration.

  The present invention relates to a filter formed in a cylindrical shape, a drainage pipe portion disposed inside the filter, and a proximal end side connected to the drainage pipe portion and a distal end side approaching the inner circumferential surface of the filter Or a nozzle portion which is disposed at and abuts against and which opens and which allows liquid to flow from the distal end side to the proximal end side, and a gas introducing portion for introducing a gas into at least one of the drainage pipe portion and the nozzle portion; The present invention relates to a liquid processing apparatus provided.

  Moreover, it is preferable that the said gas introducing part introduce | transduces gas to the front-end | tip part of the said nozzle part.

  In addition, the filter is configured to be rotatable with a central axis as a rotational axis, and the central axis is disposed along the vertical direction, and the gas introducing unit is configured to allow gas to flow in the upper end portion of the drain tube. It is preferable to introduce it.

In the liquid processing apparatus, the first pressure measurement unit that measures the pressure inside the drainage pipe unit, and the introduction of the gas by the gas introduction unit based on the first pressure measured by the first pressure measurement unit. It is preferable to further comprise a control unit that controls
The liquid processing apparatus further includes a second pressure measurement unit configured to measure the pressure on the secondary side of the filter, and the control unit is configured to measure a second pressure measured by the second pressure measurement unit and the first pressure. Preferably, the introduction of the gas by the gas introduction unit is controlled based on the pressure difference between the two.

  According to the liquid processing apparatus of the present invention, the occurrence of vibration can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the ballast water treatment apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the structure of the ballast water treatment apparatus which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the ballast water treatment apparatus which concerns on 3rd Embodiment of this invention.

Hereinafter, preferred embodiments of the liquid treatment apparatus of the present invention will be described with reference to the drawings. First, a ballast water treatment apparatus 1 as a liquid treatment apparatus of the first embodiment will be described with reference to FIG.
The ballast water treatment apparatus 1 as a liquid treatment apparatus is attached to a ship equipped with a line for pumping water such as seawater and a ballast tank for storing the pumped water as ballast water, and removes foreign substances contained in the pumped water Used to As shown in FIG. 1, the ballast water treatment apparatus 1 includes a casing 10, a filter 20 disposed inside the casing 10, a filter rotating means 30, and an introduction portion 14 for introducing ballast water into the casing 10. A cleaning mechanism 40 for sucking and removing foreign matter attached to the filter 20, an injection nozzle 50 for injecting cleaning water to the filter 20, a compressed gas supply unit 60 for supplying compressed gas to the inside of the casing 10, and a cleaning mechanism And 40 (a gas introduction unit 70 for introducing a gas into (at least one of a drain pipe 42 and a nozzle 41 described later).
Further, an introduction line L1 for introducing ballast water to the casing 10 and a washing water line L2 are connected to the ballast water treatment apparatus 1.
In addition, in this specification, a "line" is a generic term of the line which can distribute | circulate the fluid of a flow path, a path | route, a pipe line, etc.

The casing 10 contains ballast water. The casing 10 is formed in a cylindrical shape, and the central axis is disposed along the vertical direction. The casing 10 has a cylindrical main body 11 having an open upper end and a lower end, an upper lid 12 sealing the upper end of the main body 11, and a lower lid 13 sealing the lower end of the main body 11. And.
The peripheral surface of the main body portion 11 is provided with an outlet 111 from which ballast water accommodated in the casing 10 and filtered by a filter 20 described later flows out.
At positions in the upper lid 12 and the lower lid 13 that coincide with the central axis of the main body 11, through holes are formed in which filter rotating means 30 described later is disposed.

The filter 20 has a cylindrical filter body 21 having an open upper end and a lower end, an upper closing portion 22 sealing the upper end of the filter body 21, and a lower closing portion 23 closing the lower end of the filter body 21. And.
The filter 20 (filter main body 21) is formed in a cylindrical shape smaller than the casing 10, and is disposed inside the casing 10 so as to be coaxial with the casing 10. Thereby, between the casing 10 and the filter 20, ballast water outflow space S1 is formed. The filter main body 21 is formed, for example, by bending a metal plate having a large number of through holes into a cylindrical shape and welding a pair of cylindrically extending side edges.
A through hole for introducing ballast water into the inside of the filter 20 is formed at a position in the lower side closing portion 23 which coincides with the central axis of the filter body 21.

The filter rotating means 30 rotates the filter 20 disposed inside the casing 10 with the central axis as the rotation axis. The filter rotation means 30 includes an upper rotation shaft member 31 and a lower rotation shaft member 32, and a motor 33 for rotating the upper rotation shaft member 31.
The upper rotary shaft member 31 protrudes upward and is fixed at a position corresponding to the central axis of the filter 20 in the upper closing portion 22 of the filter 20. The lower rotary shaft member 32 protrudes downward and is fixed at a position corresponding to the central axis of the filter 20 in the lower closing portion 23 of the filter 20. That is, the upper rotary shaft member 31 and the lower rotary shaft member 32 respectively constitute the end of the filter 20.

The upper rotary shaft member 31 is disposed in a through hole formed in the upper lid 12 of the casing 10, and is rotatably and fluidly supported by the upper lid 12 via the slide bearing 34.
The lower rotating shaft member 32 is disposed in a through hole formed in the lower lid 13 of the casing 10, and is rotatably and fluidly supported by the lower lid 13 via a slide bearing 35. The lower rotating shaft member 32 is a tubular body in communication with the inside of the filter 20. The upper end portion of the lower rotating shaft member 32 is connected to the through hole formed in the lower closing portion 23, and the lower end portion is located inside the through hole formed in the lower lid portion 13 of the casing 10. Arranged as.

  The introduction portion 14 is formed of a tubular member, and is connected to the lower lid portion 13 so that the upper end portion covers the lower end side of the lower rotation shaft member 32. The lower end portion of the introducing unit 14 is connected to an introducing line L1 described later, and introduces ballast water supplied from the introducing line L1 to the primary side of the filter 20 inside the casing 10.

  The cleaning mechanism 40 includes a nozzle portion 41, a collecting pipe 42 as a drainage pipe portion, a discharge pipe 43, and an on-off valve 44 disposed in the discharge pipe 43.

  The nozzle portion 41 is disposed on the primary side (inner side) of the filter 20, and the tip end side opens toward the primary side surface (inner peripheral surface) of the filter 20. In the present embodiment, the nozzle portion 41 is arranged to extend in a direction (horizontal direction) perpendicular to the direction in which the central axis of the filter 20 extends. Further, a plurality of nozzle portions 41 are arranged at predetermined intervals in the direction in which the central axis of the filter 20 extends (vertical direction). The proximal end side of the nozzle portion 41 is connected to the collecting pipe 42. Ballast water flowing from the secondary side to the primary side of the filter 20 and foreign matter separated from the inner circumferential surface of the filter 20 by the ballast water flow through the nozzle portion 41.

  The collecting pipe 42 is disposed inside the filter 20. More specifically, the collecting pipe 42 is disposed at a position coincident with the central axis of the filter 20, and the upper end is closed and the lower end is opened. The upper end portion of the collecting pipe 42 is inserted into and supported by a hole provided at the center of the upper closing portion 22 of the filter 20. In the collecting pipe 42, the ballast water and the foreign substances which have flowed through the nozzle portion 41 are collected and circulated.

An upper end portion of the discharge pipe 43 is connected to a lower end portion of the collecting pipe 42, and the inside of the lower rotary shaft member 32 extends downward so as not to prevent the rotation of the filter 20. The lower end side of the discharge pipe 43 is bent and extends, and penetrates the circumferential surface of the introduction portion 14. The discharge pipe 43 discharges the ballast water and foreign substances which have flowed through the collecting pipe 42.
The on-off valve 44 is disposed on the secondary side of the discharge pipe 43 with respect to the penetration portion of the introduction portion 14 and opens and closes the discharge pipe 43.

  The injection nozzle 50 is disposed on the secondary side of the filter 20, and the tip end portion opens toward the surface (outer peripheral surface) of the secondary side of the filter 20. In the present embodiment, a plurality of injection nozzles 50 are arranged at predetermined intervals in the direction (vertical direction) in which the central axis of the filter 20 extends. The injection nozzle 50 is connected to the washing water line L2 described later, and jets the washing water supplied from the washing water line L2 toward the surface of the secondary side of the filter 20.

  The compressed gas supply unit 60 includes a compressed gas supply line 61 whose upstream side is connected to a compressed gas supply source (not shown) such as a compressor, and a compressed gas supply valve 62. The downstream side of the compressed gas supply line 61 is connected to the upper lid 12 of the casing 10, and the compressed gas is supplied between the filter 20 and the casing 10 (the secondary side of the filter 20 inside the casing 10).

The gas introducing unit 70 includes a gas introducing line 71 whose upstream side is connected to a compressed gas supply source (not shown) such as a compressor, and a gas supply valve 72 arranged in the gas introducing line 71.
In the first embodiment, the downstream side of the gas introduction line 71 is connected to the tip of the nozzle portion 41. More specifically, the gas introduction line 71 includes a main line portion 711 extending in the vertical direction along the collecting pipe 42, and a plurality of branches which are branched from the main line portion 711 and extend along the plurality of nozzle portions 41. And a line portion 712. The tip end sides of the plurality of branch line portions 712 are connected to the tip end portion of the nozzle portion 41. A nozzle formed of a porous sintered metal, a porous plate, or the like is attached to the tip of the gas introduction line 71 (a plurality of branch line portions 712) (not shown).

  According to the gas introduction unit 70 described above, by opening the gas supply valve 72, gas (air) is introduced from the compressed gas supply source through the gas introduction unit 70 to the tips of the plurality of nozzle units 41. In addition, since the nozzle is attached to the tip of the gas introduction line 71, the gas is introduced into the nozzle portion 41 as a minute air bubble.

  The introduction line L1 introduces ballast water (seawater) into the casing 10. The tip of the introduction line L1 is connected to the introduction unit 14. The pump 81 and the on-off valve 82 are disposed in the introduction line L1.

  The front end side of the flush water line L2 is connected to the spray nozzle 50, and flush water is supplied to the spray nozzle 50. The proximal end side of the flush water line L2 is connected to a flush water source (not shown).

  According to the above-described ballast water treatment apparatus 1, when filtering ballast water, the on-off valve 82 of the introduction line L1 is opened, and the pump 81 is driven. Further, the filter 20 is rotated by the filter rotating means 30. Then, the ballast water supplied from the introduction line L1 to the introduction portion 14 is introduced to the primary side (inner side) of the filter 20 inside the casing 10 through the lower rotary shaft member 32, and filtered by the filter 20, It flows out of the exit 111. The ballast water which flowed out from the outlet 111 is stored in a ballast tank (not shown).

  Further, in this state, when the on-off valve 44 of the cleaning mechanism 40 is opened, the inside of the nozzle portion 41, the collecting pipe 42 and the discharge pipe 43 has a negative pressure with respect to the inside of the casing 10. Then, a portion of the ballast water filtered from the primary side of the filter 20 to the secondary side (ballast water outflow space S1 side) again flows from the secondary side of the filter 20 to the primary side and adheres to the inner circumferential surface of the filter 20 Peel off the foreign substances. The foreign matter separated from the inner circumferential surface of the filter 20 is sucked from the nozzle portion 41.

The foreign matter sucked by the nozzle portion 41 is discharged through the collecting pipe 42 and the discharge pipe 43. As a result, the filter 20 is cleaned, and foreign matter adhering to the primary side of the filter 20 is removed.
In addition, when performing a filtration process of ballast water, all the compressed gas supply valves 62 of the compressed gas supply part 60 are shut off.

  On the other hand, after the operation of the ballast water treatment apparatus 1 is completed, or when it is desired to wash the filter 20 more strongly, the ballast water contained in the casing 10 is discharged, and then water is present inside the casing 10 In the state where it does not, the cleaning water is sprayed to the filter 20 to perform the cleaning for removing the foreign matter. In such a case, first, the on-off valve 82 of the introduction line L1 is closed, and the pump 81 is stopped. Also, the on-off valve of the cleaning mechanism 40 is closed. Then, in this state, the compressed gas supply valve 62 of the compressed gas supply unit 60 is opened. Thereby, the ballast water accommodated in the casing 10 is rapidly discharged | emitted.

  Here, in the state where the filtration process of the ballast water is performed, the amount of water sucked from the nozzle portion 41 changes due to the influence of foreign matter adhering to the filter 20, the contact state between the nozzle portion 41 and the inner surface of the filter 20, etc. As a result, pressure fluctuations occur inside the nozzle portion 41, the collecting pipe 42 and the discharge pipe 43. Then, vibration may occur in the ballast water treatment apparatus 1 due to the pressure fluctuation.

So, in this embodiment, the ballast water treatment apparatus 1 is comprised including the gas introducing part 70 which introduce | transduces gas to the nozzle part 41. As shown in FIG. By introducing a gas from the gas introduction unit 70 to the nozzle unit 41 while the ballast water is being filtered, air bubbles can be mixed into the water flowing through the nozzle unit 41, the collecting pipe 42, and the discharge pipe 43. As described above, by mixing air bubbles in the water flowing through the nozzle portion 41, the collecting pipe 42, and the discharge pipe 43, the nozzle portion 41, the collecting pipe 42, etc. when the amount of water sucked from the nozzle portion 41 changes. And the pressure fluctuation which arises inside discharge pipe 43 can be controlled. Therefore, generation | occurrence | production of the vibration resulting from a pressure fluctuation can be suppressed.
From the viewpoint of suitably reducing pressure fluctuations in the nozzle portion 41, the collecting pipe 42 and the discharge pipe 43, the mixing ratio of gas (bubbles) is preferably 1% to 10%, and 3% to 7%. It is more preferable that

  The introduction of the gas into the nozzle 41 by the gas introduction unit 70 may be performed continuously when the ballast water is being filtered, but is not limited thereto. For example, the ballast water treatment apparatus controls the introduction of gas by the gas introduction unit 70 based on the pressure measurement unit that measures the pressure inside the collecting pipe 42 or the discharge pipe 43 and the pressure measured by the pressure measurement unit. The controller may be configured to include. Then, when the fluctuation range of the pressure measured by the pressure measurement unit exceeds a predetermined threshold set in advance, the gas introduction unit 70 may introduce the gas. In such a configuration, when a predetermined pressure fluctuation is measured inside the collecting pipe 42 by the pressure measuring unit, the gas introduction unit 70 can be operated to suppress the pressure fluctuation. Therefore, since the gas can be introduced from the gas introduction part 70 only when necessary, energy consumption can be suppressed.

  According to the ballast water treatment apparatus 1 of the first embodiment described above, the following effects can be obtained.

  An assembly in which the ballast water treatment apparatus 1 is brought close to or in contact with the inner circumferential surface of the filter 20 and water is able to flow from the tip end side to the base end side It comprised including the pipe | tube 42 and the gas introducing part 70 which introduce | transduces gas into at least one of the collection pipe | tube 42 and the nozzle part 41. FIG. Thus, air is introduced into the water flowing through the collecting pipe 42 and the nozzle portion 41 by introducing the gas from the gas introducing portion 70 into the collecting pipe 42 or the nozzle portion 41. Therefore, the pressure fluctuation generated inside the nozzle portion 41 and the collecting pipe 42 can be suppressed, for example, when the amount of water sucked from the nozzle portion 41 changes. Therefore, generation | occurrence | production of the vibration resulting from a pressure fluctuation can be suppressed. As a result, the ballast water treatment apparatus 1 can be operated more stably, and the life of the apparatus can be extended.

  The gas was introduced into the gas introduction unit 70 from the tip of the nozzle unit 41. As a result, air bubbles can be mixed into the whole of the nozzle portion 41 and the collecting pipe 42, so that the pressure fluctuation suppressing effect can be enhanced.

  The gas introduction line 71 was configured to include the main line portion 711 and the plurality of branch line portions 712, and the plurality of branch line portions 712 introduced gas to the tip portions of all the plurality of nozzle portions 41. Thus, the gas (bubbles) can be introduced into all the nozzle portions 41, so the effect of suppressing pressure fluctuation can be further enhanced.

  At the tip of the gas introduction line 71, a nozzle made of a porous sintered metal, a porous plate or the like was attached. As a result, the gas can be introduced as minute air bubbles into the nozzle portion 41, so the pressure fluctuation suppressing effect can be further enhanced.

  In the case where the filter 20 is formed in a cylindrical shape, in a cylindrical side surface (peripheral surface), a joint portion by welding or the like occurs. At this junction, the filter 20 is blocked. Here, when the filter 20 is configured to be rotatable and the nozzle portion 41 is in contact with the inner peripheral surface of the filter 20, pressure fluctuation is particularly likely to occur at the timing when the nozzle portion 41 is in contact with the joint portion. Is considered. According to the present embodiment, in the ballast water treatment apparatus 1 in which the filter 20 is configured to be rotatable as described above, the pressure fluctuation inside the nozzle portion 41 and the collecting pipe 42 can be particularly suitably suppressed.

Next, a ballast water treatment apparatus 1A according to a second embodiment will be described with reference to FIG. The ballast water treatment apparatus 1A of the second embodiment is different from the first embodiment in the arrangement of the gas introduction unit 70A (gas introduction line 71A). In the description of the second embodiment, the same components will be assigned the same reference numerals, and the description thereof will be omitted or simplified.
In the second embodiment, the downstream side of the gas introduction line 71A is connected to the upper end of the collecting pipe. Thereby, in the second embodiment, the gas is introduced to the upper end of the collecting pipe 42.

According to the ballast water treatment apparatus 1A of the second embodiment, in addition to the same effects as those of the first embodiment, the following effects can be obtained.
The filter 20 was disposed such that the central axis was along the vertical direction, and gas was introduced from the gas introduction portion 70A to the upper end portion of the collecting pipe 42. Thus, by introducing the gas into the upper end portion of the collecting pipe 42, the air flow can be mixed in the entire collecting pipe 42 by the flow of water in the collecting pipe 42. Therefore, pressure fluctuation can be effectively suppressed.

Next, a ballast water treatment apparatus 1B according to a third embodiment will be described with reference to FIG. The ballast water treatment apparatus 1B of the third embodiment is the first embodiment in that the introduction of gas by the gas introduction unit 70 is controlled based on the differential pressure between the pressure inside the discharge pipe 43 and the pressure on the secondary side of the filter 20. It is different from the form. In the description of the third embodiment, the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.
As shown in FIG. 3, the ballast water treatment apparatus 1 </ b> B of the present embodiment is configured to include a first pressure measurement unit 91, a second pressure measurement unit 92, and a control unit 93. The first pressure measurement unit 91 is installed inside the discharge pipe 43, and measures the pressure (first pressure P1) inside the discharge pipe 43. The second pressure measurement unit 92 is disposed on the secondary side of the filter 20, and measures the pressure (second pressure P2) on the secondary side of the filter 20. Then, the control unit 93 controls the introduction of the gas by the gas introduction unit 70 based on the differential pressure ΔP (= P2-P1) of the second pressure P2 and the first pressure P1.

  Specifically, when the differential pressure ΔP exceeds a predetermined threshold set in advance, the control unit 93 controls the gas introducing unit 70 to introduce a gas. The predetermined threshold value of the differential pressure ΔP is, for example, preferably 100 kPa to 500 kPa, more preferably 200 kPa to 400 kPa, and still more preferably 250 kPa to 350 KPa. Specifically, the predetermined threshold value of the differential pressure ΔP is, for example, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350 kPa, and between any two of the values exemplified here. It may be in the range of

  In addition, it is preferable to perform introduction | transduction of the gas by the gas introduction part 70 when differential pressure | voltage (DELTA) P once exceeds a predetermined | prescribed threshold value continuously for predetermined time. That is, the control unit 93 starts gas introduction by the gas introduction unit 70 when the differential pressure ΔP once exceeds the predetermined threshold, but even if the differential pressure ΔP temporarily falls below the predetermined threshold thereafter, The introduction of the gas by the gas introduction unit 70 is not stopped until the predetermined time (for example, one hour) elapses. This is because if the introduction of the gas is stopped immediately after the differential pressure ΔP falls below the predetermined threshold, the differential pressure ΔP is likely to rise again to cause hunting. After the predetermined time has elapsed, the introduction of the gas is stopped after the differential pressure ΔP is stabilized in a low state, thereby suppressing hunting and more effectively suppressing the water hammer. It is preferable that the detection of the differential pressure ΔP by the first pressure measurement unit 91 and the second pressure measurement unit 92 be continued even within a predetermined time. As a result, when the differential pressure ΔP does not fall below the predetermined threshold, it is possible to continue the introduction of gas even after the predetermined time has elapsed, and to suppress the water hammer.

Heretofore, a preferred embodiment of the ballast water treatment apparatus of the present invention has been described. However, the present invention can be implemented in various forms without being limited to the above-described embodiment.
For example, in the first embodiment, the gas introduction line 71 is configured to include the main line portion 711 and the plurality of branch line portions 712, and the plurality of branch line portions 712 form the tip of all the plurality of nozzle portions 41. Although the gas can be introduced, it is not limited thereto. That is, the branch line portion may be disposed only in a predetermined nozzle portion of the plurality of nozzle portions to introduce the gas.

  Moreover, in 1st Embodiment-3rd Embodiment, although this invention was applied to ballast water treatment apparatus 1, 1A, 1B which has the filter 20 which rotates with respect to the nozzle part 41, it does not restrict to this. That is, the present invention may be applied to a ballast water treatment apparatus in which the nozzle portion rotates with respect to the filter. In addition, the present invention may be applied to a ballast water treatment apparatus in which the nozzle portion and the filter do not rotate together.

  Further, in the first and second embodiments, the filter 20 is disposed so that the rotation axis of the filter 20 is along the vertical direction (vertical direction), but the present invention is not limited to this. That is, the filter may be disposed such that the rotation axis is along the horizontal direction.

  In the first to third embodiments, the present invention is applied to a ballast water treatment apparatus for treating ballast water used on a ship, but the present invention is not limited to this. That is, the present invention may be applied to a water treatment apparatus that treats water such as sea, river, lake, pond, pond and the like, industrial water and the like. Furthermore, it is also possible to apply not to the water treatment apparatus which processes water but to the liquid treatment apparatus which processes liquids (for example, oil) other than water.

1, 1A, 1B Ballast water treatment system (liquid treatment system)
DESCRIPTION OF SYMBOLS 10 Casing 11 Main body part 111 Outlet 12 Upper lid part 13 Lower lid part 14 Introduction part 20 Filter 21 Filter main body 22 Upper closing part 30 Lower closing part 30 Rotation means 31 Upper rotation shaft member 32 Lower rotation shaft member 33 Motor 40 Cleaning mechanism 41 Nozzle part 42 Collecting pipe (drainage pipe part)
43 discharge pipe 44 on-off valve 50 injection nozzle 60 compressed gas supply unit 61 compressed gas supply line 62 compressed gas supply valve 70, 70A gas introduction unit 71 gas introduction line 711 main line unit 712 branch line unit 72 gas introduction valve 81 pump 82 opening and closing Valve 91 1st pressure measurement part 92 2nd pressure measurement part 93 Control part L1 Introduction line L2 Wash water line P1 1st pressure P2 2nd pressure ΔP differential pressure

Claims (5)

A cylindrically formed filter,
A drain line disposed inside the filter;
A proximal end side connected to the drainage tube portion and a distal end side disposed and opened at a position approaching or abutting on the inner circumferential surface of the filter, and a nozzle portion capable of flowing liquid from the distal end side to the proximal end side;
A liquid processing apparatus comprising: a gas introduction line connected to at least one of the drainage pipe portion and the nozzle portion; and a gas introduction portion for introducing a gas into at least one of the drainage pipe portion and the nozzle portion .   The liquid processing apparatus according to claim 1, wherein the gas introducing unit introduces a gas to a tip of the nozzle unit. The filter is configured to be rotatable about a central axis as a rotational axis, and the central axis is disposed along the vertical direction.
The liquid processing apparatus according to claim 1, wherein the gas introduction unit introduces a gas to an upper end portion of the drainage pipe unit. A first pressure measuring unit that measures the pressure inside the drainage pipe;
The liquid processing apparatus according to any one of claims 1 to 3, further comprising: a control unit that controls the introduction of the gas by the gas introduction unit based on the first pressure measured by the first pressure measurement unit. . It further comprises a second pressure measurement unit that measures the pressure on the secondary side of the filter,
The liquid according to claim 4, wherein the control unit controls the introduction of the gas by the gas introduction unit based on a differential pressure between the second pressure measured by the second pressure measurement unit and the first pressure. Processing unit.