Floating contaminant recovery device and floating contaminant recovery system

Abstract

The present invention provides a floating pollutant recovery device and a floating pollutant recovery system that can efficiently recover floating pollutants from environmental water taken into a ship. In the present invention, a floating pollutant recovery device (40) installed on a ship (2) and recovering floating pollutants contained in environmental water taken into the ship (2) includes: a recovery filter (41) disposed in a backwash drain line (L4) through which backwash drain water flows after backwashing a filter (120) of a filter device (12) that filters environmental water; and a clean water supply mechanism (50) that supplies clean water to the recovery filter (41).

Description

Technical Field

[0001] This invention relates to a device and system for recovering airborne pollutants from environmental water. This application claims priority based on Japanese Patent Application No. 2020-176498, filed on October 21, 2020, the contents of which are incorporated herein by reference. Background Technology

[0002] Ballast water used in cargo ships, oil tankers, and other vessels to maintain safe hull attitude and draft causes disturbance to marine ecosystems due to the transboundary migration of harmful aquatic organisms, posing a significant environmental problem. Patent Document 1, for example, provides a technology for draining ballast water to reduce aquatic organisms to below a certain level.

[0003] Patent Document 1 describes a ballast water filtration and treatment device consisting of modules structurally independent of the ballast water treatment system. This device not only performs primary filtration during ballasting when backwash water can be discharged outside the ship, but also performs secondary filtration and backwashing for differential pressure elimination during discharge ballasting when backwash water cannot be discharged outside the ship. This improves the final filtration rate of marine microorganisms.

[0004] Furthermore, Patent Documents 2 and 3 disclose techniques for obtaining aquatic organisms from acquired environmental water. For example, Patent Document 2 describes a sampling system for ship ballast water that can easily and continuously collect ballast water without the need for a large storage tank, and sample the aquatic organisms contained in the ballast water while they are still alive. Patent Document 3 describes a microbial concentrator in which the filter dividing the storage section of the sample water into a supply side and a discharge side is configured so that no vertical downward force is applied to the surface of the supply side, thereby minimizing damage to the microorganisms and enabling the recovery of a larger number of the microorganisms while they are still alive.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2018-153795

[0008] Patent Document 2: Japanese Patent Application Publication No. 2009-115500

[0009] Patent Document 3: Japanese Patent Application Publication No. 2015-14516 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] Plastic pollution accounts for a significant portion of marine debris and is gradually becoming a major threat. In particular, addressing marine pollution caused by planktonic pollutants, including microplastics, has become an urgent issue. While large amounts of ambient water are drawn and discharged from ships as cooling water and ballast water, the planktonic pollutants contained in this ambient water are not effectively recycled or treated.

[0012] The purpose of this invention is to provide a floating pollutant recovery device and a floating pollutant recovery system capable of efficiently recovering floating pollutants from ambient water taken into a ship.

[0013] Solution for solving the problem

[0014] This invention relates to a floating pollutant recovery device, which is installed on a ship to recover floating pollutants contained in ambient water taken into the ship. The floating pollutant recovery device comprises: a recovery filter, which is disposed in a backwash drainage line for backwash drainage of the filter of the filtration device for filtering ambient water; and a clean water supply mechanism that supplies clean water to the recovery filter.

[0015] Preferably, the clean water supply mechanism has a clean water forward wash line connected to the upstream side of the recovery filter and supplying clean water to the recovery filter from the upstream side of the recovery filter.

[0016] Preferably, the clean water supply mechanism includes: a clean water backwash line connected to the downstream side of the recovery filter and supplying clean water to the recovery filter from the downstream side of the recovery filter; a clean water drain line that discharges the backwash clean water supplied from the clean water backwash line and used to backwash the recovery filter; and a recovery container that recovers the backwash clean water flowing in the clean water drain line.

[0017] Preferably, the airborne pollutant recovery device further includes a separator located upstream of the recovery filter in the backwash drainage line, which separates the solids contained in the backwash drainage flowing in the backwash drainage line.

[0018] Preferably, the filtration accuracy of the recovery filter is 200μm to 800μm.

[0019] Furthermore, the present invention relates to a planar pollutant recovery system installed on a ship to recover planar pollutants contained in ambient water taken into the ship. The planar pollutant recovery system comprises: a water intake line for drawing ambient water into the ship; a water intake pump disposed on the water intake line; a filtration device disposed downstream of the water intake line and having a filter for filtering the ambient water flowing through the water intake line; a treated water storage tank for storing the treated water filtered in the filtration device; a treated water line connecting the filtration device to the treated water storage tank; a backwash line supplying treated water to the filtration device from a direction opposite to the filtration direction of the filter; a backwash drain line connected upstream of the filtration device at a position upstream of the filter, and discharging backwash drain, which is the treated water after backwashing, supplied to the filtration device from the backwash line; and a planar pollutant recovery device having a recovery filter disposed on the backwash drain line and a clean water supply mechanism for supplying clean water to the recovery filter.

[0020] Invention Effects

[0021] According to the present invention, a floatation pollutant recovery device and a floatation pollutant recovery system are provided that can efficiently recover floatation pollutants from ambient water taken into a ship. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating a planar pollutant recovery system according to an embodiment of the present invention.

[0023] Figure 2 This is a flowchart illustrating an example of the clean water backwashing process of the airborne pollutant recovery device according to this embodiment.

[0024] Figure 3 This is a flowchart illustrating an example of the clean water backwashing process of the airborne pollutant recovery device of this embodiment.

[0025] Figure 4 This is a schematic diagram illustrating a first modified example of a floating pollutant recovery system.

[0026] Figure 5 This is a schematic diagram illustrating a second modified example of a floating pollutant recovery system. Detailed Implementation

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a schematic diagram illustrating a planar pollutant recovery system 1 according to an embodiment of the present invention.

[0028] A planktonic pollutant recovery system 1 is installed on the vessel 2. The planktonic pollutant recovery system 1 has the function of recovering planktonic pollutants from water (hereinafter, ambient water) obtained by the vessel 2 from environments such as oceans, rivers, lakes, and swamps. In this embodiment, the water obtained by the vessel 2 from such environments is, for example, ballast water. Furthermore, planktonic pollutants are defined as planktonic matter (substances that pass through a 2mm screen and remain on 1μm filter media) as defined under environmental and drainage standards, plastics larger than 2mm, and microplastics smaller than 5mm or 1mm.

[0029] <Overall Structure>

[0030] The overall structure of the airborne pollutant recovery system 1 is described below. It should be noted that in the following description, "line" refers to any line that allows fluid to flow, including flow paths, routes, and pipes.

[0031] like Figure 1 As shown, the airborne pollutant recovery system 1 includes a water intake line L1, a water intake pump 11, a filter device 12, a treated water line L2, a treated water storage tank 13, a backwash line L3, a treated water backwashing on / off valve 31, a backwash pump 32, a backwash drainage line L4, an airborne pollutant recovery device 40, and a control device 100.

[0032] Water intake line L1 is a line that draws ambient water (e.g., seawater, brackish water, fresh water) from the outside of vessel 2 into the inside of vessel 2. A water intake port located at one end of water intake line L1 (the upstream end) is positioned to obtain ambient water, for example, below sea level. The other end of water intake line L1 (the downstream end) is connected to filter device 12.

[0033] Water intake pump 11 is installed on water intake line L1. Driven by water intake pump 11, ambient water is drawn in from the outside of the vessel 2 through water intake line L1.

[0034] The filtration device 12 includes a filter 120 for filtering ambient water flowing through the water intake line L1 and a filter tower body 121 for holding the filter 120. Ambient water passes through the filtration device 12 and becomes treated water. It should be noted that the filtration device 12 can be of various types. For example, the filtration device 12 can also be a ballast water treatment device in which backwashing is performed in parallel with the filtration process to eliminate clogging of the filter 120's pores.

[0035] The treatment water line L2 is a line through which the treated water processed by the filter device 12 flows. One end of the treatment water line L2 (the upstream end) is connected to the filter device 12, and the other end of the treatment water line L2 (the downstream end) is connected to the treated water storage tank 13.

[0036] The treated water storage tank 13 stores the treated water that has been filtered by the filter device 12. A backwash line L3 is connected to the treated water storage tank 13 for backwashing the filter 120 of the filter device 12. It should be noted that, although in Figure 1 Although not shown in the figure, a treated water discharge line for discharging treated water to the outside of the vessel 2 may also be connected to the treated water storage tank 13.

[0037] Backwash line L3 is a line that supplies treated water to filter 120 in the opposite direction to the filtration direction of filter 120 in filter device 12. One end of backwash line L3 (upstream end) is connected to treated water storage tank 13. The other end of backwash line L3 (downstream end) is connected in filter device 12 at a position downstream of filter 120 (treated water outlet side) in the flow of ambient water in the filtration direction.

[0038] The backwash valve 31 is located on backwash line L3. The backwash valve 31 is closed when the filter 120 is not being backwashed. When the filter 120 is being backwashed, the backwash valve 31 changes from closed to open.

[0039] Backwash pump 32 is configured on backwash line L3. Driven by backwash pump 32, treated water is supplied to filter 120 from the opposite direction of filtration through backwash line L3.

[0040] Backwash drain line L4 is the line through which the treated water, i.e., the backwash drain, flows after backwashing the filter 120. One end of the backwash drain line L4 (the upstream end) is connected in the filter device 12 to a position upstream of the filter 120 (the water intake line L1 side, the ambient water inlet side) in the flow direction of the filtered ambient water. The treated water after backwashing the filter device 12 is discharged to the outside of the vessel 2 through this backwash drain line L4.

[0041] The hydrocyclone 35 separates solids contained in the backwash wastewater flowing through the backwash wastewater line L4 by performing solid-liquid separation using the flow of water. The backwash wastewater discharged from the filter device 12 reaches the airborne pollutant recovery device 40 after separation by the hydrocyclone 35. It should be noted that the hydrocyclone 35 is equipped with a discharge line (not shown) that continuously or intermittently discharges the wastewater accumulated inside.

[0042] The airborne pollutant recovery device 40 is used to recover airborne pollutants such as microplastics and is located downstream of the hydrocyclone 35 in the backwash drainage line L4.

[0043] The airborne pollutant recovery device 40 of this embodiment includes a recovery filter 41 for capturing airborne pollutants, a recovery container 42 for storing airborne pollutants, a filter housing 43 for holding the recovery filter 41, and a clean water supply mechanism 50 for supplying clean water to the recovery filter 41.

[0044] The recovery filter 41 uses a recovery filter with a filtration accuracy capable of recovering airborne pollutants. For example, the filtration accuracy of the recovery filter 41 is preferably 200 μm to 800 μm.

[0045] In this embodiment, a metal sieve filter with a filtration accuracy of 300 μm to 500 μm is used for the recovery filter 41. It should be noted that this structure is not limited to this; spring filters and other types of filters can also be used for the recovery filter 41. For example, the filtration accuracy of the filter 120 of the filtration device 12 can be the same as that of the recovery filter 41, or a metal sieve filter with a mesh size of 0.3 mm can be used to match a plankton net (0.3 mm mesh) used for microplastic sampling in the ocean. It should be noted that in this embodiment, filtration accuracy refers to the ability to capture particles with a particle removal efficiency of 99% or higher, as indicated by the pore size value.

[0046] The filter housing 43 keeps the recycling filter 41 in a removable manner. As a removable structure, it can be adopted in a suitable manner, such as a box form.

[0047] The recovery container 42 is a container for holding liquid containing airborne pollutants obtained through backwashing with clean water supplied from the clean water supply unit 50 to the recovery filter 41. Details regarding the recovery method for the liquid containing airborne pollutants in the recovery container 42 are described later.

[0048] The clean water supply mechanism 50 is a device that supplies clean water to the recycling filter 41. The clean water supply mechanism 50 of this embodiment includes a clean water tank 51, a clean water common line L5, a clean water pump 52, a clean water forward wash line L6, a forward wash on / off valve 53, a clean water backwash line L7, a clean water backwash on / off valve 54, and a clean water drain line L8.

[0049] The fresh water tank 51 is a tank capable of storing a specified amount of fresh water. The fresh water stored in the fresh water tank 51 is preferably water with a sufficiently low salt concentration compared to seawater or brackish water taken into the vessel 2. For example, it may also be water produced by a water-making device inside the vessel 2.

[0050] The common clean water line L5 is used to supply clean water stored in the clean water tank 51 to the recovery filter 41. One end of the common clean water line L5 (the upstream end) is connected to the clean water tank 51, and the other end of the common clean water line L5 (the downstream end) branches into the clean water forward wash line L6 and the clean water backwash line L7.

[0051] A clean water pump 52 is installed on the clean water common line L5. Driven by the clean water pump 52, clean water is sent from the clean water common line L5 through the clean water forward wash line L6 or the clean water backwash line L7 to the recovery filter 41.

[0052] The clean water forward wash line L6 supplies clean water to the recovery filter 41 in the same direction as the filtration direction of the filter device 12 (backwash drainage). One end of the clean water forward wash line L6 (the upstream end) is connected to the clean water tank 51 via the clean water common line L5. The other end of the clean water forward wash line L6 (the downstream end) is connected to the upstream side (filter device 12 side or hydrocyclone 35 side) of the recovery filter 41 in the airborne pollutant recovery device 40.

[0053] The on / off valve 53 for backwashing is located on the clean water backwash line L6. Hereinafter, the process of supplying clean water to the recovery filter 41 via the clean water backwash line L6 will be defined as clean water backwashing. When the recovery filter 41 is not being backwashed, the on / off valve 53 for backwashing is in the closed state. When the recovery filter 41 is being backwashed, the on / off valve 53 for backwashing changes from the closed state to the open state.

[0054] The clean water backwash line L7 supplies clean water to the recovery filter 41 in the opposite direction to the filtration direction of the filter device 12 (backwash drainage). One end of the clean water backwash line L7 (upstream end) is connected to the clean water tank 51 via the clean water common line L5. The other end of the clean water backwash line L7 (downstream end) is connected to the downstream side of the recovery filter 41 in the airborne pollutant recovery device 40 (outlet side of the backwash drainage line L4).

[0055] A backwash valve 54 is installed on the backwash line L7. Hereinafter, the process of supplying clean water to the recovery filter 41 via the backwash line L7 will be defined as a backwash process. When the recovery filter 41 is not being backwashed, the backwash valve 54 is in the closed state. When the recovery filter 41 is being backwashed, the backwash valve 54 changes from the closed state to the open state.

[0056] The clean water drain line L8 is a line that sends the backwash clean water after backwashing the recovery filter 41 in the clean water backwashing process to the recovery container 42. One end of the clean water drain line L8 (the upstream end) is connected to the upstream side (the filter device 12 side or the hydrocyclone 35 side) of the recovery filter 41, and the other end (the downstream end) is connected to the recovery container 42.

[0057] In this embodiment, the clean water supply mechanism 50 is controlled by the control device 100 for the processing of supplying clean water.

[0058] The control device 100 is a computer including a CPU, ROM, RAM, and storage devices. The control device 100 is electrically connected to the filter device 12, the treated water backwash valve 31, the backwash pump 32, the airborne pollutant recovery device 40, the clean water pump 52, the forward wash valve 53, and the clean water backwash valve 54, and performs various controls. Alternatively, the control device 100 can be configured as a separate control device that coordinates the control of the filter device 12 with the controls of the other devices (treated water backwash valve 31, backwash pump 32, airborne pollutant recovery device 40, clean water pump 52, forward wash valve 53, and clean water backwash valve 54, etc.).

[0059] <Recycling Control Based on Clean Water Backwash Treatment>

[0060] Next, the control of recovering airborne pollutants by using a clean water backwash process that supplies clean water to the recovery filter 41 through the clean water backwash line L6 will be explained. Figure 2 This is a flowchart illustrating an example of the clean water backwashing process of the airborne pollutant recovery device 40 of this embodiment.

[0061] When the control device 100 receives an instruction to recover airborne pollutants through user operation or a pre-set schedule, it initiates backwash drainage control (step S1). In this backwash drainage control, the control device 100 performs the process of transferring the backwash valve 31 from the closed state to the open state and driving the backwash pump 32.

[0062] By performing step S1, the filter 120 of the filtration device 12 is backwashed with treated water. The backwash water from the filter 120, after passing through the cyclone separator 35 located on the backwash water line L4, is discharged to the outside of the vessel 2 via the recovery filter 41. The recovery filter 41 captures airborne pollutants contained in the backwash water. In this embodiment, the entire volume of the backwash water from the filter 120 passes through the recovery filter 41 of the airborne pollutant recovery device 40.

[0063] After the processing in step S1, the control device 100 initiates the clean water forward wash control (step S2). In this clean water forward wash control, the control device 100 keeps the forward wash on / off valve 53 open and maintains the clean water backwash on / off valve 54 closed. Furthermore, the clean water pump 52 is driven to supply clean water to the recovery filter 41 in the forward direction (the same direction as the backwash drainage). The clean water that has passed through the recovery filter 41 in the forward direction is discharged to the outside of the vessel 2 through the backwash drainage line L4 as before.

[0064] By performing step S2, the filter 41 and the filtered material are cleaned to remove salt, and the backwash water containing salt is discharged outside the vessel 2.

[0065] After the processing in step S2, the control device 100 determines whether the clean water backwash control has ended based on predetermined conditions (step S3). If sufficient clean water for rinsing is supplied to the recovery filter 41, the process proceeds to step S4. If sufficient clean water for rinsing is not supplied to the recovery filter 41, the clean water supply control continues. The predetermined conditions can be a predetermined time determined by a timer, or a water quality sensor (conductivity sensor, etc.) can be installed downstream of the recovery filter 41, and the completion of the process can be determined based on the detection value of the water quality sensor.

[0066] When the process transitions to step S4, the control device 100 controls the supply of clean water to stop in order to remove the recovery filter 41 from the airborne pollutant recovery device 40. In this embodiment, the backwash valve 53 is switched from the open state to the closed state, and the drive of the clean water pump 52 is stopped. This results in a state where the recovery filter 41, with its salt content removed, can be recovered from the airborne pollutant recovery device 40. The user removes the recovery filter 41, which has captured airborne pollutants, from the filter housing 43, thereby disposing of the airborne pollutants by appropriate methods such as incineration.

[0067] <Recycling Control Based on Clean Water Backwashing Treatment>

[0068] Next, the control of recovering airborne pollutants by using a clean water backwashing process that supplies clean water to the recovery filter 41 via the clean water backwashing line L7 will be explained. Figure 3 This is a flowchart illustrating an example of the clean water backwashing process of the airborne pollutant recovery device 40 of this embodiment.

[0069] When the control device 100 receives an instruction to recover airborne pollutants through user operation or a pre-set schedule, it initiates backwash drainage control (step S21). This backwash drainage control in step S21 is related to... Figure 2 The process is the same as step S1 in the flow.

[0070] After the processing in step S21, the control device 100 begins the clean water forward wash control (step S22). In this clean water forward wash control, the control device 100 controls the forward wash on / off valve 53 to the open state and maintains the clean water backwash on / off valve 54 in the closed state. Furthermore, the clean water pump 52 is driven to supply clean water to the recovery filter 41 in the forward direction (the same direction as the backwash drainage). The clean water that has passed through the recovery filter 41 in the forward direction is discharged to the outside of the vessel 2 through the backwash drainage line L4 as is. By performing the processing in step S22, the recovery filter 41 and the filtered material are desalted by the clean water, and the backwash water containing salt is discharged to the outside of the vessel 2.

[0071] After the processing in step S22, the control device 100 starts the clean water backwash control (step S23). In this clean water backwash control, the control device 100 controls the clean water backwash on / off valve 54 to the open state and maintains the forward wash on / off valve 53 in the closed state. Additionally, a process is performed to switch the path within the airborne pollutant recovery device 40 so that the clean water that has passed through the recovery filter 41 in the reverse direction is recovered to the recovery container 42. Furthermore, the clean water pump 52 is driven to supply clean water to the recovery filter 41 in the reverse direction (the reverse of the filtration direction of the backwash drainage). The clean water that has passed through the recovery filter 41 in the reverse direction is recovered to the recovery container 42.

[0072] By performing the process in step S23, the airborne pollutants captured in the backwash drainage control in step S21 are flushed away by clean water in the reverse direction and recovered into the recovery container 42 along with the clean water through the clean water drainage line L8.

[0073] After the processing in step S23, the control device 100 determines whether the clean water backwash control has ended based on predetermined conditions (step S24). If sufficient clean water is supplied to the recovery filter 41 for the recovery of airborne pollutants, the process proceeds to step S24. If sufficient clean water is not supplied to the recovery filter 41 for the recovery of airborne pollutants, the clean water backwash control continues.

[0074] In this embodiment, a predetermined condition is set such that the flow rate of water passing through the recovery filter 41 in the reverse direction during the clean water backwash control is less than 1 / 300th of the flow rate of water passing through the recovery filter 41 in the forward direction during the backwash drainage control in step S21. It should be noted that the predetermined condition can be a predetermined time determined by a timer, or a water quality sensor can be installed between the recovery filter 41 and the recovery container 42, and the completion of the treatment can be determined based on the detection value of this water quality sensor (such as a turbidity sensor). Furthermore, the recovery container 42 is configured to recover the entire amount of clean water supplied to the recovery filter 41 during a single clean water backwash control, thereby reliably removing suspended pollutants from the recovery filter 41 and recovering them to the recovery container 42.

[0075] When the process transitions to step S25, the control device 100 controls the supply of clean water to stop in order to treat the clean water recovered to the recovery container 42. In this embodiment, the clean water backwash valve 54 is switched from an open state to a closed state, and the drive of the clean water pump 52 is stopped. By making the flow rate of water passing through the recovery filter 41 in the reverse direction during clean water backwash control smaller than the flow rate of water passing through the recovery filter 41 in the forward direction during backwash drainage control, the airborne pollutants can be concentrated. For example, the airborne pollutants containing water recovered to the recovery container 42 can be incinerated (evaporation treatment). Since the amount of water contained in the airborne pollutants is smaller than the amount of backwash drainage in the backwash drainage control, efficient disposal of airborne pollutants with reduced treatment volume is achieved.

[0076] As explained above, the airborne pollutant recovery device 40 is configured as follows: the airborne pollutant recovery device 40 includes: a recovery filter 41, which is disposed in a backwash drain line L4 through which backwash drain water flows after backwashing of the filter 120 of the filtration device 12 for filtering ambient water; and a clean water supply mechanism 50, which supplies clean water to the recovery filter 41.

[0077] Additionally, the airborne pollutant recovery system 1 includes: an intake line L1 that draws ambient water into the vessel 2; an intake pump 11 disposed on the intake line L1; a filter device 12 disposed downstream of the intake line L1 and having a filter 120 for filtering the ambient water flowing through the intake line L1; a treated water storage tank 13 that stores the treated water filtered in the filter device 12; a treated water line L2 that connects the filter device 12 to the treated water storage tank 13; a backwash line L3 that supplies treated water to the filter device 12 from the opposite direction to the filtration direction of the filter 120; a backwash discharge line L4 that is connected upstream of the filter device 12 at a position upstream of the filter 120 and discharges the backwash discharge, which is the treated water after backwashing, supplied from the backwash line L3 to the filter device 12; and an airborne pollutant recovery device 40 that includes a recovery filter 41 disposed on the backwash discharge line L4 and a clean water supply mechanism 50 for supplying clean water to the recovery filter 41.

[0078] The airborne pollutant recovery device 40 or airborne pollutant recovery system 1 according to this embodiment can efficiently recover airborne pollutants from the backwash water of the filter device 12, and can effectively prevent the backwash water containing airborne pollutants from being discharged to the outside of the ship 2.

[0079] In addition, the clean water supply mechanism 50 of this embodiment has a clean water forward wash line L6 connected to the upstream side of the recovery filter 41 and supplying clean water to the recovery filter 41 from the upstream side of the recovery filter 41.

[0080] Therefore, by passing clean water through the recovery filter 41 in a positive direction relative to the recovery filter 41, salt can be removed from the recovery filter 41, thereby suppressing the generation of dioxins during incineration and the deterioration of the incinerator caused by salt. Furthermore, by preventing the generation of dioxins, incineration can also be carried out during the navigation of the ship 2.

[0081] In addition, the clean water supply mechanism 50 of this embodiment includes: a clean water backwash line L7, which is connected to the downstream side of the recovery filter 41 and supplies clean water to the recovery filter 41 from the downstream side of the recovery filter 41; a clean water drain line L8, which discharges the backwash clean water supplied from the clean water backwash line L7 and used to backwash the recovery filter 41; and a recovery container 42, which recovers the backwash clean water flowing in the clean water drain line L8.

[0082] Therefore, by reducing the flow rate of the recovery filter 41 in the opposite direction to that in the clean water backwash control compared to the forward flow rate in the backwash drainage control, the water containing airborne pollutants can be concentrated. Furthermore, the water containing airborne pollutants can be stored in the recovery container 42 and managed as a sample, and the airborne pollutants can be treated by evaporating the water stored in the recovery container 42. Moreover, since the concentrated water containing airborne pollutants can be stored in the recovery container 42, backwash drainage control can be started immediately after the clean water backwash control. This further improves the recovery efficiency of airborne pollutants.

[0083] In addition, the airborne pollutant recovery device 40 of this embodiment also includes a hydrocyclone 35, which is located upstream of the recovery filter 41 in the backwash drainage line L4 and separates the solids contained in the backwash drainage flowing in the backwash drainage line L4.

[0084] Therefore, a certain amount of solid matter can be removed by using the hydrocyclone 35, which can reduce the load on the recovery filter 41 and efficiently capture airborne pollutants. Even when there are a lot of dense and large-particle materials such as sand in the backwash wastewater, the load on the recovery filter 41 located downstream of the hydrocyclone 35 can be suppressed.

[0085] The filtration accuracy of the recovery filter 41 in this embodiment is 200μm to 800μm.

[0086] Therefore, it can suppress filter pore clogging caused by natural organisms, organic matter, etc., and reliably recover airborne pollutants.

[0087] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments and can be modified appropriately.

[0088] In the above embodiments Figure 3 The flowchart describes the method of performing a backwash control after a forward rinse, but the forward rinse control can be omitted depending on the situation. This allows for appropriate changes to the control method.

[0089] Furthermore, while the above embodiment describes a structure where the hydrocyclone 35 is positioned upstream of the airborne pollutant recovery device 40, a separator other than a hydrocyclone can also be used. Additionally, the hydrocyclone 35 can be omitted depending on the situation. Thus, the various structures provided in the above embodiment can be appropriately modified. Hereinafter, variations of the above embodiment will be described.

[0090] Figure 4This is a schematic diagram showing a first modified example of a floating pollutant recovery system 1. Figure 5 This is a schematic diagram illustrating a second modified example of the airborne pollutant recovery system 1. In the above embodiment, the structure of the clean water supply mechanism 50 performing both clean water forward washing control and clean water backwashing control is described, but the system is not limited to this structure. Figure 4 As shown, it can also be configured to omit the clean water backwash line L7, the clean water backwash on / off valve 54, the clean water drain line L8, and the recovery container 42 from the clean water supply mechanism 50 of the above embodiment, and only perform clean water forward wash control. In this case, the recovery filter 41 is removed after the clean water forward wash, and the airborne pollutants are recovered together with the filter 120. Similarly, as Figure 5 As shown, it can also be configured to omit the clean water forward wash line L6 and the forward wash on / off valve 53 from the clean water supply mechanism 50 of the above embodiment and only perform clean water backwash control.

[0091] Explanation of reference numerals in the attached figures

[0092] 1. Airborne Pollutant Recovery System

[0093] 2 Ships

[0094] 11 Water intake pump

[0095] 12 Filtration devices

[0096] 13. Treated water storage tank

[0097] 40. Airborne Pollutant Recovery Device

[0098] 41 Recycling Filter

[0099] 50 clean water supply organizations

[0100] 120 filter

[0101] L1 Water Intake Line

[0102] L2 water treatment line

[0103] L3 backwash line

[0104] L4 backwash drain line.

Claims

1. A floating pollutant recovery device, installed on a ship and configured in the backwash drainage line of a filtration device for filtering floating pollutants contained in ambient water taken into the ship, wherein, The filtration device is located downstream of the vessel's water intake line and filters the ambient water flowing through that water intake line. The treated water filtered by the filtration device is stored in a treated water storage tank via a treated water line. The treated water is supplied from the backwash line of the filtration device, which supplies the treated water from the treated water storage tank to the filtration device, in a direction opposite to the filtration direction of the filter. The backwash water from the filter of the filtration device is discharged from the backwash drain line. The airborne pollutant recovery device includes: A recovery filter, configured in the backwash drain line; and A clean water supply system supplies clean water to the recycling filter. The clean water supply system has the following features: A clean water backwash line is connected to the upstream side of the recovery filter and supplies clean water to the recovery filter from the upstream side of the recovery filter; A clean water backwash line is connected to the downstream side of the recovery filter and supplies clean water to the recovery filter from the downstream side of the recovery filter; A clean water drainage line, which discharges backwash clean water supplied from the clean water backwash line and used to backwash the recovery filter; and A recycling container that recycles the backwash water flowing through the clean water drain line.

2. The airborne pollutant recovery device according to claim 1, wherein, The airborne pollutant recovery device also includes a separator located upstream of the recovery filter in the backwash drainage line, which separates the solids contained in the backwash drainage flowing in the backwash drainage line.

3. The airborne pollutant recovery device according to claim 1, wherein, The filtration accuracy of the recovery filter is 200μm to 800μm.

4. A system for recovering airborne pollutants, installed on a ship to recover airborne pollutants contained in ambient water taken into the ship, wherein, The airborne pollutant recovery system has the following features: A water intake line that draws ambient water into the vessel; A water intake pump, which is configured on the water intake line; A filtration device is disposed downstream of the water intake line and has a filter for filtering the ambient water flowing through the water intake line. A treated water storage tank that stores the treated water filtered in the filtration device; A water treatment line that connects the filtration device to the treated water storage tank; A backwash line supplies treated water to the filtration device from a direction opposite to the filtration direction of the filter; A backwash drain line, its upstream side connected to a position in the filtration device upstream of the filter, discharges the backwash wastewater supplied from the backwash line to the filtration device as treated water after backwashing; and A floating pollutant recovery device includes a recovery filter disposed in the backwash drainage line and a clean water supply mechanism for supplying clean water to the recovery filter. The clean water supply system has the following features: A clean water backwash line is connected to the upstream side of the recovery filter and supplies clean water to the recovery filter from the upstream side of the recovery filter; A clean water backwash line is connected to the downstream side of the recovery filter and supplies clean water to the recovery filter from the downstream side of the recovery filter; A clean water drainage line, which discharges backwash clean water supplied from the clean water backwash line and used to backwash the recovery filter; and A recycling container that recycles the backwash water flowing through the clean water drain line.

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