Floating contaminant recovery device and floating contaminant recovery system

Abstract

To provide a floating contaminant recovery device capable of efficiently recovering floating contaminants from environmental water taken into a craft, and a floating contaminant recovery system.SOLUTION: A floating contaminant recovery device 40, which is mounted on a craft 2 and which recovers floating contaminants included in environmental water taken into the craft 2, comprises a recovery filter 41 arranged in a backwash drainage line L4 through which backwash drainage water after backwashing a filter 120 of a filtering apparatus 12 for filtering the environmental water is circulated, and fresh water supply means 50 for supplying fresh water to the recovery filter 41.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a suspended pollutant recovery device and a suspended pollutant recovery system for recovering suspended pollutants from environmental water. [Background technology]

[0002] Ballast water, which is used to maintain a safe ship's posture and draft in cargo ships, tankers, etc., disrupts marine ecosystems due to the transboundary movement of harmful aquatic organisms, and has become a major environmental problem. For example, Patent Document 1 describes a technology for reducing the aquatic organisms in ballast water to a certain level and discharging it.

[0003] Patent Document 1 describes how a ballast water filtration treatment device consisting of a module independent of the configuration of the ballast water treatment system not only performs primary filtration during ballasting, when the backwash water can be discharged overboard, but also performs secondary filtration and backwashing to eliminate pressure differences during de-ballasting, when the backwash water cannot be discharged overboard, thereby increasing the final filtration rate of marine microorganisms.

[0004] Furthermore, Patent Documents 2 and 3 disclose techniques for recovering aquatic organisms from collected environmental water. For example, Patent Document 2 describes a ship ballast water sampling system that does not require the provision of a large storage tank, can easily and continuously collect ballast water, and can sample live aquatic organisms contained in the ballast water. Patent Document 3 describes a microorganism concentrator that prevents significant damage to microorganisms and recovers many of the microorganisms alive by arranging a filter that separates a water storage section that stores sample water into a supply side and a discharge side of the sample water so that no vertical downward force acts on the supply side surface. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-153795 A [Patent Document 2] JP 2009-115500 A [Patent Document 3] JP 2015-14516 A Summary of the Invention [Problem to be solved by the invention]

[0006] Plastic pollution accounts for a significant portion of marine litter and is becoming an increasingly serious threat. Addressing marine pollution by suspended pollutants, especially microplastics, is an urgent issue. Although ships take in and discharge large amounts of environmental water for cooling and ballast water, there are no effective measures to collect and treat the suspended pollutants contained in the environmental water.

[0007] The present invention aims to provide a suspended pollutant recovery device and a suspended pollutant recovery system that can efficiently recover suspended pollutants from environmental water taken into a ship. [Means for solving the problem]

[0008] The present invention relates to a floating pollutant recovery device that is attached to a ship and recovers floating pollutants contained in environmental water taken into the ship, and the floating pollutant recovery device comprises a recovery filter arranged in a backwash drainage line through which backwash drainage flows after backwashing the filter of a filtration device that filters environmental water, and a fresh water supply means that supplies fresh water to the recovery filter.

[0009] The fresh water supplying means preferably includes a fresh water forward washing line connected to the upstream side of the recovery filter and supplying fresh water from the upstream side of the recovery filter to the recovery filter.

[0010] It is preferable that the fresh water supply means includes a fresh water backwash line connected to the downstream side of the recovery filter and supplying fresh water from the downstream side of the recovery filter to the recovery filter, a fresh water drain line for discharging the backwash fresh water supplied from the fresh water backwash line after backwashing the recovery filter, and a recovery container for collecting the backwash fresh water flowing through the fresh water drain line.

[0011] It is preferable that the suspended contaminant recovery device further includes a separator arranged upstream of the recovery filter in the backwash drain line, for separating solids contained in the backwash drain flowing through the backwash drain line.

[0012] The filtration accuracy of the recovery filter is preferably 200 μm to 800 μm.

[0013] The present invention also relates to a floating pollutant recovery system that is attached to a ship and recovers floating pollutants contained in environmental water taken into the ship, the floating pollutant recovery system comprising: a water intake line for taking in environmental water into the ship; a water intake pump arranged in the water intake line; a filtration device arranged downstream of the water intake line and having a filter for filtering the environmental water flowing through the water intake line; a treated water storage tank for storing treated water filtered in the filtration device; a treated water line connecting the filtration device and the treated water storage tank; a backwash line for supplying treated water to the filtration device from the opposite direction to the filtration direction of the filter; a backwash drain line whose upstream side is connected upstream of the filter in the filtration device and discharges backwash drainage, which is the treated water after backwashing supplied from the backwash line to the filtration device; and a floating pollutant recovery device having a recovery filter arranged in the backwash drain line and a fresh water supply means for supplying fresh water to the recovery filter. Effect of the Invention

[0014] According to the present invention, it is possible to provide a suspended pollutant recovery device and a suspended pollutant recovery system that can efficiently recover suspended pollutants from environmental water taken into a ship. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic diagram showing a suspended contaminant collection system according to one embodiment of the present invention; [Diagram 2] 4 is a flowchart showing an example of a fresh water forward washing process of the suspended pollutant recovery apparatus of the present embodiment. [Diagram 3] 4 is a flowchart showing an example of a fresh water backwashing process of the suspended pollutant recovery apparatus of the present embodiment. [Figure 4] FIG. 2 is a schematic diagram showing a suspended pollutant recovery system according to a first modified example. [Diagram 5] FIG. 11 is a schematic diagram showing a suspended pollutant recovery system according to a second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic diagram showing a suspended pollutant recovery system 1 according to one embodiment of the present invention.

[0017] The floating pollutant recovery system 1 is attached to a ship 2. The floating pollutant recovery system 1 has a function of recovering floating pollutants from water (hereinafter, environmental water) acquired by the ship 2 from environments such as the sea, river, lake, and swamp. In this embodiment, the water acquired by the ship 2 from environments such as the sea, river, lake, and swamp is, for example, ballast water. Furthermore, the floating pollutants include suspended matter as defined in environmental standards and wastewater standards (substances that pass through a 2 mm sieve and remain on a 1 μm filter material), plastics of 2 mm or more, and microplastics of 5 mm or less or 1 mm or less, etc.

[0018] <Overall composition> A description will now be given of the overall configuration of the suspended pollutant recovery system 1. In the following description, the term "line" is a general term for a line, such as a flow path, a pathway, or a pipe, through which a fluid can flow.

[0019] As shown in FIG. 1, the suspended pollutant recovery system 1 includes a water intake line L1, a water intake pump 11, a filtration device 12, a treated water line L2, a treated water storage tank 13, a backwash line L3, a treated water backwash on-off valve 31, a backwash pump 32, a backwash drainage line L4, a suspended pollutant recovery device 40, and a control device 100.

[0020] The water intake line L1 is a line that takes in environmental water (e.g., seawater, brackish water, fresh water) outside the ship 2 into the ship 2. The water intake port located at one end (upstream end) of the water intake line L1 is located at a position where the environmental water can be obtained, for example, below sea level. The other end (downstream end) of the water intake line L1 is connected to the filtration device 12.

[0021] The water intake pump 11 is disposed in the water intake line L1. When the water intake pump 11 is driven, environmental water is taken in from the outside to the inside of the ship 2 through the water intake line L1.

[0022] The filtration device 12 has a filter 120 that filters the environmental water flowing through the water intake line L1, and a filtration tower main body 121 that holds the filter 120. The environmental water passes through the filtration device 12 to become filtered treated water. Various types of filtration device 12 can be used. For example, the filtration device 12 may be a ballast water treatment device that performs a backwashing process in parallel with the filtration process to eliminate clogging of the filter 120.

[0023] The treated water line L2 is a line through which treated water treated by the filtration device 12 flows. One end (upstream end) of the treated water line L2 is connected to the filtration device 12, and the other end (downstream end) of the treated water line L2 is connected to the treated water storage tank 13.

[0024] The treated water storage tank 13 stores the treated water filtered by the filtration device 12. A backwash line L3 for backwashing the filter 120 of the filtration device 12 is connected to the treated water storage tank 13. Although not shown in FIG. 1, a treated water discharge line for discharging the treated water to the outside of the ship 2 may be connected to the treated water storage tank 13.

[0025] The backwash line L3 is a line that supplies treated water to the filter 120 of the filtration device 12 in a direction opposite to the filtration direction of the filter 120. One end (upstream end) of the backwash line L3 is connected to the treated water storage tank 13. The other end (downstream end) of the backwash line L3 is connected to the downstream side (the outlet side of the treated water) of the filter 120 in the flow of the filtration direction in which the environmental water is filtered in the filtration device 12.

[0026] The treated water backwash on-off valve 31 is disposed in the backwash line L3. The treated water backwash on-off valve 31 is in a closed state when backwashing of the filter 120 is not performed. When backwashing of the filter 120 is performed, the treated water backwash on-off valve 31 transitions from a closed state to an open state.

[0027] The backwash pump 32 is disposed in the backwash line L3. When the backwash pump 32 is driven, treated water is supplied to the filter 120 through the backwash line L3 in a direction opposite to the filtration direction.

[0028] The backwash drainage line L4 is a line through which backwash drainage, which is treated water after backwashing the filter 120, flows. One end (upstream end) of the backwash drainage line L4 is connected to the upstream side (the water intake line L1 side, the environmental water inlet side) of the filter 120 in the filtration direction flow in which the environmental water is filtered in the filtration device 12. The treated water after backwashing the filtration device 12 is discharged outside the ship 2 through this backwash drainage line L4.

[0029] The cyclone 35 separates solids contained in the backwash drainage flowing through the backwash drainage line L4 by performing solid-liquid separation using the flow of water. The backwash drainage discharged from the filtration device 12 reaches the suspended pollutant recovery device 40 after being separated by the cyclone 35. The cyclone 35 is provided with a discharge line (not shown) for continuously or intermittently discharging the drainage water accumulated therein.

[0030] The suspended pollutant recovery device 40 is for recovering suspended pollutants such as microplastics, and is disposed downstream of the cyclone 35 in the backwash drainage line L4.

[0031] The suspended contaminant collection device 40 of this embodiment comprises a collection filter 41 for capturing suspended contaminants, a collection container 42 for storing the suspended contaminants, a filter housing 43 for holding the collection filter 41, and a fresh water supply means 50 for supplying fresh water to the collection filter 41.

[0032] A filter with a filtering accuracy capable of filtering suspended contaminants is used as the collection filter 41. For example, the filtering accuracy of the collection filter 41 is preferably 200 μm to 800 μm.

[0033] In this embodiment, a metal mesh filter with a filtration accuracy of 300 μm to 500 μm is used for the collection filter 41. However, this is not limited to the above configuration, and a spring filter or other types of filters can be used for the collection filter 41. For example, the filtration accuracy of the filter 120 of the filtration device 12 and the filtration accuracy of the collection filter 41 may be the same, or a metal mesh filter with a mesh size of 0.3 mm may be used in accordance with a Neuston net (mesh size of 0.3 mm) used for sampling microplastics in the ocean. In this embodiment, the filtration accuracy indicates that the particle removal efficiency of particles with the indicated pore size value can be 99% or more.

[0034] The filter housing 43 detachably holds the collection filter 41. As a detachable structure, any suitable method, such as a cartridge type, can be used.

[0035] The collection vessel 42 is a vessel for storing liquid containing suspended contaminants obtained by backwashing with fresh water supplied to the collection filter 41 by the fresh water supply means 50. Details of the method for collecting the liquid containing suspended contaminants in the collection vessel 42 will be described later.

[0036] The fresh water supply means 50 is a device that supplies fresh water to the recovery filter 41. The fresh water supply means 50 of this embodiment includes a fresh water tank 51, a fresh water common line L5, a fresh water pump 52, a fresh water forward wash line L6, a forward wash on-off valve 53, a fresh water backwash line L7, a fresh water backwash on-off valve 54, and a fresh water drain line L8.

[0037] The fresh water tank 51 is a tank capable of storing a predetermined amount of fresh water. The fresh water stored in the fresh water tank 51 is preferably water (fresh water) having a sufficiently low salinity concentration compared to seawater or brackish water taken into the ship 2. For example, the fresh water may be water produced by a freshwater production system in the ship 2.

[0038] The fresh water common line L5 is a line for supplying the fresh water stored in the fresh water tank 51 to the recovery filter 41. One end (upstream end) of the fresh water common line L5 is connected to the fresh water tank 51, and the other end (downstream end) of the fresh water common line L5 branches into a fresh water forward wash line L6 and a fresh water back wash line L7.

[0039] The fresh water pump 52 is disposed in the fresh water common line L5. When the fresh water pump 52 is driven, fresh water is sent from the fresh water common line L5 to the recovery filter 41 through the fresh water forward washing line L6 or the fresh water back washing line L7.

[0040] The fresh water forward washing line L6 is a line that supplies fresh water to the collection filter 41 in the same direction as the filtration direction (backwash drainage) of the filtration device 12. One end (upstream end) of the fresh water forward washing line L6 is connected to the fresh water tank 51 via the fresh water common line L5. The other end (downstream end) of the fresh water forward washing line L6 is connected to the upstream side of the collection filter 41 in the suspended pollutant collection device 40 (the filtration device 12 side or the cyclone 35 side).

[0041] The forward wash on-off valve 53 is disposed in the fresh water forward wash line L6. Hereinafter, the process of supplying fresh water to the collection filter 41 through the fresh water forward wash line L6 will be referred to as the fresh water forward wash process. When the fresh water forward wash process of the collection filter 41 is not performed, the forward wash on-off valve 53 is in a closed state. When the fresh water forward wash process is performed on the collection filter 41, the forward wash on-off valve 53 transitions from a closed state to an open state.

[0042] The fresh water backwash line L7 is a line that supplies fresh water to the recovery filter 41 in a direction opposite to the filtration direction (backwash drainage) of the filtration device 12. One end (upstream end) of the fresh water backwash line L7 is connected to the fresh water tank 51 via the fresh water common line L5. The other end (downstream end) of the fresh water backwash line L7 is connected to the downstream side of the recovery filter 41 in the suspended contaminant recovery device 40 (the outlet side of the backwash drainage line L4).

[0043] The fresh water backwashing on-off valve 54 is disposed in the fresh water backwashing line L7. Hereinafter, the process of supplying fresh water to the collection filter 41 through the fresh water backwashing line L7 will be referred to as the fresh water backwashing process. When the fresh water backwashing process of the collection filter 41 is not performed, the fresh water backwashing on-off valve 54 is in a closed state. When the fresh water backwashing process of the collection filter 41 is performed, the fresh water backwashing on-off valve 54 transitions from a closed state to an open state.

[0044] The fresh water drain line L8 is a line that sends the backwash fresh water after backwashing the collection filter 41 in the fresh water backwashing process to the collection container 42. One end (upstream end) of the fresh water drain line L8 is connected to the upstream side (the filtration device 12 side or the cyclone 35 side) of the collection filter 41, and the other end (downstream end) is connected to the collection container 42.

[0045] In the fresh water supply means 50 of this embodiment, the process for supplying fresh water is controlled by the control device 100.

[0046] The control device 100 is a computer including a CPU, a ROM, a RAM, a storage device, etc. The control device 100 is electrically connected to the filtration device 12, the treated water backwash on-off valve 31, the backwash pump 32, the suspended pollutant recovery device 40, the fresh water pump 52, the forward wash on-off valve 53, and the fresh water backwash on-off valve 54, and executes various controls. The control device 100 may be a separate control device that links the control of the filtration device 12 with the control of the others (the treated water backwash on-off valve 31, the backwash pump 32, the suspended pollutant recovery device 40, the fresh water pump 52, the forward wash on-off valve 53, the fresh water backwash on-off valve 54, etc.).

[0047] <Recovery control by clean water washing process> Next, a control for recovering suspended contaminants by a fresh water forward washing process in which fresh water is supplied to the recovery filter 41 through the fresh water forward washing line L6 will be described. Fig. 2 is a flow chart showing an example of the fresh water forward washing process of the suspended contaminant recovery device 40 of this embodiment.

[0048] When the control device 100 receives a command to collect suspended pollutants by a user operation or a preset schedule, etc., it starts backwash drainage control (step S1). In this backwash drainage control, the control device 100 executes a process in which the treated water backwash opening / closing valve 31 transitions from a closed state to an open state and the backwash pump 32 is driven.

[0049] By executing the process of step S1, the filter 120 of the filtration device 12 is backwashed with the treated water. The backwash drainage water after backwashing the filter 120 passes through a cyclone 35 arranged in the backwash drainage line L4, and then passes through a recovery filter 41 and is discharged outside the ship 2. The recovery filter 41 captures suspended pollutants contained in the backwash drainage water. In this embodiment, the entire amount of the backwash drainage water from the filter 120 passes through the recovery filter 41 of the suspended pollutant recovery device 40.

[0050] After the process of step S1, the control device 100 starts fresh water forward wash control (step S2). In this fresh water forward wash control, the control device 100 controls the forward wash on-off valve 53 to an open state and maintains the fresh water backwash on-off valve 54 in a closed state. Then, the fresh water pump 52 is driven to supply fresh water to the recovery filter 41 in a forward direction (the same direction as the filtration direction of the backwash drainage). The fresh water that has passed through the recovery filter 41 in the forward direction is discharged directly to the outside of the ship 2 through the backwash drainage line L4.

[0051] By executing the process of step S2, salt is removed from the collection filter 41 and the filtered material by the fresh water, and the post-wash water containing salt is discharged outside the ship 2.

[0052] After the process of step S2, the control device 100 judges whether the clean water forward washing control has ended based on a predetermined condition (step S3). If sufficient clean water for washing has been supplied to the collection filter 41, the process proceeds to step S4. If sufficient clean water for washing is not supplied to the collection filter 41, the clean water supply control continues. The predetermined condition may be a predetermined time determined by a timer, or a water quality sensor (such as an electrical conductivity sensor) may be placed downstream of the collection filter 41, and whether the process has ended may be judged based on the detection value of the water quality sensor.

[0053] When the process proceeds to step S4, the control device 100 performs control to stop the supply of fresh water in order to remove the collection filter 41 from the suspended contaminant collection device 40. In this embodiment, the forward wash on-off valve 53 is shifted from an open state to a closed state, and the operation of the fresh water pump 52 is stopped. This makes it possible to collect the collection filter 41 from which the salt has been removed, from the suspended contaminant collection device 40. The user removes the collection filter 41 that has captured the suspended contaminants from the filter housing 43, and disposes of the suspended contaminants by an appropriate method, such as incineration.

[0054] <Recovery control by fresh water backwashing process> Next, a control for recovering suspended contaminants by fresh water backwashing processing in which fresh water is supplied to the recovery filter 41 through the fresh water backwashing line L7 will be described. Fig. 3 is a flow chart showing an example of the fresh water backwashing processing of the suspended contaminant recovery device 40 of this embodiment.

[0055] When the control device 100 receives a command to collect suspended pollutants by a user operation or a preset schedule, the control device 100 starts backwash drainage control (step S21). The backwash drainage control in step S21 is the same process as step S1 in the flow of FIG.

[0056] After the process of step S21, the control device 100 starts fresh water forward wash control (step S2). In this fresh water forward wash control, the control device 100 controls the forward wash on-off valve 53 to an open state and maintains the fresh water backwash on-off valve 54 in a closed state. Then, the fresh water pump 52 is driven to supply fresh water to the recovery filter 41 in a forward direction (the same direction as the filtration direction of the backwash drainage). The fresh water that has passed through the recovery filter 41 in the forward direction is discharged directly to the outside of the ship 2 through the backwash drainage line L4. By executing the process of step S22, salt is removed from the recovery filter 41 and the filtered material by the fresh water, and the water after the forward wash containing salt is discharged to the outside of the ship 2.

[0057] After the process of step S22, the control device 100 starts fresh water backwash control (step S23). In this fresh water backwash control, the control device 100 controls the fresh water backwash on-off valve 54 to be open, and maintains the forward wash on-off valve 53 in a closed state. In addition, the control device 100 executes a process of switching the path in the suspended contaminant recovery device 40 so that the fresh water that has passed through the recovery filter 41 in the reverse direction is recovered in the recovery container 42. Then, the fresh water pump 52 is driven to supply fresh water to the recovery filter 41 in the reverse direction (the opposite direction to the filtration direction of the backwash drainage). The fresh water that has passed through the recovery filter 41 in the reverse direction is recovered in the recovery container 42.

[0058] By executing the process of step S23, the suspended contaminants captured on the recovery filter 41 by the backwash drainage control of step S21 are swept away in the reverse direction by the fresh water and are recovered together with the fresh water in the recovery container 42 via the fresh water drainage line L8.

[0059] After the process of step S23, the control device 100 judges whether the fresh water backwash control has ended based on a predetermined condition (step S24). If sufficient fresh water has been supplied to the collection filter 41 to collect the suspended contaminants from the collection filter 41, the process proceeds to step S24. If sufficient fresh water has not been supplied to the collection filter 41 to collect the suspended contaminants, the fresh water backwash control continues.

[0060] In this embodiment, the predetermined condition is set so that the amount of water passing through the collection filter 41 in the reverse direction in the fresh water backwash control is 1 / 300 or less of the amount of water passing through the collection filter 41 in the forward direction in the backwash drain control in step S21. The predetermined condition may be a predetermined time determined by a timer, or a water quality sensor may be disposed between the collection filter 41 and the collection container 42, and whether or not the process is completed may be determined based on the detection value of the water quality sensor (e.g., a turbidity sensor). In addition, the collection container 42 is configured to be able to collect the entire amount of fresh water supplied to the collection filter 41 in one fresh water backwash control, so that suspended contaminants can be reliably removed from the collection filter 41 and collected in the collection container 42.

[0061] When the process proceeds to step S25, the control device 100 performs control to stop the supply of fresh water in order to treat the fresh water collected in the collection container 42. In this embodiment, the fresh water backwash opening / closing valve 54 is shifted from an open state to a closed state, and the drive of the fresh water pump 52 is stopped. The amount of water passing through the collection filter 41 in the reverse direction in the fresh water backwash control is made smaller than the amount of water passing through the collection filter 41 in the forward direction in the step backwash drainage control, so that the floating contaminants can be concentrated. For example, the floating contaminant-containing water collected in the collection container 42 is incinerated (evaporated). The amount of the floating contaminant-containing water is smaller than the amount of backwash drainage drained in the backwash drainage control, so that efficient disposal of the floating contaminants with a reduced amount of treatment is realized.

[0062] As described above, the suspended contaminant recovery device 40 is configured as follows: That is, the suspended contaminant recovery device 40 includes a recovery filter 41 arranged in a backwash drainage line L4 through which backwash drainage flows after backwashing the filter 120 of the filtration device 12 that filters environmental water, and a fresh water supply means 50 that supplies fresh water to the recovery filter 41.

[0063] The floating pollutant recovery system 1 also includes an intake line L1 for taking in environmental water into the ship 2, an intake pump 11 arranged on the intake line L1, a filtration device 12 arranged downstream of the intake line L1 and having a filter 120 for filtering the environmental water flowing through the intake line L1, a treated water storage tank 13 for storing treated water filtered in the filtration device 12, a treated water line L2 connecting the filtration device 12 and the treated water storage tank 13, a backwash line L3 for supplying treated water to the filtration device 12 from the opposite direction to the filtration direction of the filter 120, a backwash drainage line L4 whose upstream side is connected upstream of the filter 120 in the filtration device 12 and discharges backwash drainage, which is the treated water after backwash supplied from the backwash line L3 to the filtration device 12, and a floating pollutant recovery device 40 having a recovery filter 41 arranged on the backwash drainage line L4 and a fresh water supply means 50 for supplying fresh water to the recovery filter 41.

[0064] The floating pollutant recovery device 40 or the floating pollutant recovery system 1 of this embodiment can efficiently recover floating pollutants from the backwash water of the filtration device 12, and can effectively prevent the occurrence of a situation in which the backwash wastewater containing floating pollutants is discharged outside the ship 2.

[0065] Further, the fresh water supply means 50 of this embodiment is connected to the upstream side of the collection filter 41 and has a fresh water forward washing line L6 that supplies fresh water to the collection filter 41 from the upstream side of the collection filter 41.

[0066] This allows fresh water to pass through the recovery filter 41 in the forward direction, thereby removing salt from the recovery filter 41, thereby suppressing the generation of dioxins during incineration and deterioration of the incinerator due to salt. Furthermore, by preventing the generation of dioxins, incineration can be performed while the ship 2 is sailing.

[0067] In addition, the fresh water supply means 50 of this embodiment is connected to the downstream side of the recovery filter 41 and includes a fresh water backwash line L7 that supplies fresh water to the recovery filter 41 from the downstream side of the recovery filter 41, a fresh water drain line L8 that discharges the backwash fresh water supplied from the fresh water backwash line L7 and used to backwash the recovery filter 41, and a recovery container 42 that recovers the backwash fresh water flowing through the fresh water drain line L8.

[0068] As a result, the amount of water passing through the recovery filter 41 in the reverse direction during the fresh water backwash control is lowered relative to the amount of water passing through the recovery filter 41 in the forward direction during the backwash drain control, thereby concentrating the water containing suspended contaminants. The water containing suspended contaminants can also be stored in the recovery container 42 and managed as a sample, or the water containing suspended contaminants stored in the recovery container 42 can be evaporated to treat the suspended contaminants. Since the concentrated water containing suspended contaminants can be stored in the recovery container 42, the backwash drain control can be started immediately after the fresh water backwash control. This can further improve the recovery efficiency of suspended contaminants.

[0069] In addition, the suspended pollutant recovery device 40 of this embodiment is further equipped with a cyclone 35 as a separator that is arranged upstream of the recovery filter 41 in the backwash drainage line L4 and separates solids contained in the backwash drainage flowing through the backwash drainage line L4.

[0070] This allows the cyclone 35 to remove a certain amount of solid matter, reducing the load on the collection filter 41 and enabling suspended contaminants to be captured efficiently. Even if the backwash wastewater contains a large amount of material with a high sand specific gravity and large particle size, the load on the collection filter 41 located downstream of the cyclone 35 can be reduced.

[0071] The filtration accuracy of the collection filter 41 of this embodiment is 200 μm to 800 μm.

[0072] This makes it possible to reliably collect suspended pollutants while preventing filter clogging due to naturally occurring organisms and organic matter.

[0073] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment and can be modified as appropriate.

[0074] In the above embodiment, the flow chart of Fig. 3 has been described in which the fresh water backwash control is performed after the fresh water forward wash control, but in some cases the fresh water forward wash control may be omitted. In this way, the control method can be changed as appropriate.

[0075] In the above embodiment, the cyclone 35 is disposed upstream of the floating pollutant recovery device 40, but a separator that is not a cyclone type may also be used. In some cases, the cyclone 35 may be omitted. In this manner, each component of the above embodiment may be modified as appropriate. Modifications of the above embodiment will be described below.

[0076] FIG. 4 is a schematic diagram showing the suspended pollutant recovery system 1 of the first modified example. FIG. 5 is a schematic diagram showing the suspended pollutant recovery system 1 of the second modified example. In the above embodiment, the configuration in which the fresh water supply means 50 executes both the fresh water forward washing control and the fresh water backwash control has been described, but the present invention is not limited to this configuration. As shown in FIG. 4, the fresh water backwash line L7, the fresh water backwash opening / closing valve 54, the fresh water drainage line L8, and the recovery container 42 may be omitted from the fresh water supply means 50 of the above embodiment, and only the fresh water forward washing control may be performed. In this case, the recovery filter 41 is removed after the fresh water forward washing, and the suspended pollutants are recovered together with the filter 120. Similarly, as shown in FIG. 5, the fresh water forward washing line L6 and the forward washing opening / closing valve 53 may be omitted from the fresh water supply means 50 of the above embodiment, and only the fresh water backwash control may be performed. [Explanation of symbols]

[0077] 1. Airborne Contaminant Collection System 2 ships 11 Water Intake Pump 12 Filtration equipment 13 Treated water storage tank 40 Floating Contaminant Collection Device 41 Collection filter 50 Fresh water supply means 120 Filters L1 Water intake line L2 Treated water line L3 Backwash line L4 Backwash drain line

Claims

1. A floating pollutant recovery device that is installed on a ship and disposed in a backwash drainage line of a filtration device that filters floating pollutants contained in environmental water taken into the ship, The filtering device is disposed downstream of a water intake line of the ship, and filters environmental water flowing through the water intake line using a filter; The treated water filtered by the filtration device is stored in a treated water storage tank through a treated water line, supplying treated water from the treated water storage tank to the filtration device through a backwash line in a direction opposite to the filtering direction of the filter of the filtration device; The backwash drainage after backwashing the filter of the filtration device is discharged from the backwash drainage line, A recovery filter disposed in the backwash drainage line; fresh water supply means for supplying fresh water to the recovery filter; A floating pollutant recovery device comprising:

2. 2. The suspended contaminant recovery device according to claim 1, wherein the fresh water supply means includes a fresh water forward washing line connected to the upstream side of the recovery filter for supplying fresh water from the upstream side of the recovery filter to the recovery filter.

3. The fresh water supply means is A fresh water backwash line connected to the downstream side of the recovery filter and supplying fresh water from the downstream side of the recovery filter to the recovery filter; A fresh water drainage line that discharges the backwash fresh water supplied from the fresh water backwash line and used to backwash the recovery filter; A recovery container for recovering backwash fresh water flowing through the fresh water drainage line; 2. The floating contaminant recovery system of claim 1, comprising:

4. A floating pollutant recovery device as described in any one of claims 1 to 3, further comprising a separator arranged upstream of the recovery filter in the backwash drainage line, which separates solids contained in the backwash drainage flowing through the backwash drainage line.

5. 5. The floating contaminant recovery device according to claim 1, wherein the recovery filter has a filtering accuracy of 200 μm to 800 μm.

6. A floating pollutant recovery system that is installed on a ship and recovers floating pollutants contained in environmental water taken into the ship, comprising: a water intake line for introducing environmental water into the vessel; A water intake pump disposed in the water intake line; a filtration device disposed downstream of the water intake line and having a filter for filtering the environmental water flowing through the water intake line; a treated water storage tank for storing the treated water filtered by the filtration device; a treated water line connecting the filtration device and the treated water storage tank; A backwash line for supplying treated water to the filtration device from a direction opposite to the filtration direction of the filter; A backwash drainage line, the upstream side of which is connected to the upstream side of the filter in the filtration device and which discharges backwash drainage, which is treated water after backwashing supplied from the backwash line to the filtration device; A floating contaminant recovery device having a recovery filter disposed in the backwash drain line and a fresh water supply means for supplying fresh water to the recovery filter; A suspended contaminant recovery system comprising:

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