KR20100077012A - Ballast water treatment system - Google Patents

Abstract

According to a ballast water treatment system in one embodiment of the present invention, the quality of a ballast water is monitored, and the operating conditions of a water treatment apparatus are controlled based on the results of the monitoring. By virtue of the above constitution, even when the quality of the ballast water significantly varies depending upon water intake conditions, the ballast water can be treated to always have a constant quality. Further, since water treatment is carried out according to the quality of the ballast water, excess injection of a liquid chemical used in the water treatment and a lack in the amount of the liquid chemical injected can be prevented. For example, when a water treatment apparatus of a sterilization system is used, excess injection of a sterilizing agent and a lack in the amount of the sterilizing agent injected can be prevented, and thus, the application of a load by the sterilizing agent on a coating in the ballast tank and an environment can be prevented.

Description

Ballast Water Treatment System {BALLAST WATER TREATMENT SYSTEM}

The present invention relates to a ballast water treatment system, and more particularly to a ballast water treatment system for removing aquatic life from the ballast water of a ship.

Ballast tanks are installed in ships carrying ore, crude oil, and the like, and ballast water such as seawater and fresh water is stored in the ballast tanks to secure attitude control and stability of the hull. Since the ballast water is withdrawn into the ballast tank when it is empty and drained from the ballast tank as the dripping proceeds, the ballast water is drained in a different area from the intake pond. Accordingly, aquatic organisms may move along with ballast water and settle in a new environment, in which case, it is feared to destroy ecosystems or affect economic activities such as fisheries. In addition, it is also concerned that pathogens that move with the ballast water directly affect the health of the human body.

Therefore, in the international treaty concerning ballast water management of ships, in February 2004, the "International Convention for the Regulation and Management of Ballast Water and Sediment of Ships" was adopted, and the installation of a ballast water treatment device is mandatory. The ballast water management standards set by the International Maritime Organization (IMO) are as follows.

The organism having a minimum size of 50 μm or more has less than 10 living organisms in 1 m 3.

Organisms with a minimum size of less than 50 μm and more than 10 μm have less than 10 living organisms in 1 ml.

Toxin acid producing cholera (O-1, O-139) is less than 1 cfu / 100 mu m.

E. coli less than 250 cfu / 100ml.

Enterococci less than 100 cfu / 100 ml.

In order to satisfy such a criterion, various ballast water treatment techniques for purifying ballast water have been proposed. For example, conventionally, after filtration (physical treatment) with a filter, the sterilization method of adding a sterilizing agent is the mainstream, and Patent Document 1 sterilizes the ballast water by adding a chlorine-based chemical. Patent Document 2 sterilizes the ballast water with hydrogen peroxide, and Patent Document 3 sterilizes the ballast water with ozone.

In recent years, agglomeration separation method is also proposed instead of the sterilization method. For example, in Patent Document 4, by adding a drug and a magnetic component to the ballast water, the aquatic organisms to be removed are entrained to form a magnetic floe, and the magnetic floc is recovered by using a magnet or a filter. Aquatic organisms are separated and removed.

Japanese Patent Application Laid-open No. Hei 4-322788 Japanese Patent Application Laid-open No. Hei 5-910 Japanese Patent Application Publication No. 2006-212494 Japanese Patent Application Laid-Open No. 2005-218887

By the way, the ballast water is likely to be withdrawn from ports around the world, and the water quality varies greatly depending on the water intake place. For example, in water bodies where water pollution has advanced, there are many aquatic organisms such as bacteria and plankton present in the water by eutrophication. In addition, even in the same body of water, the amount of aquatic organisms varies greatly with the seasons, convection, etc. may occur due to temperature differences between day and night, and the amount of aquatic organisms may change in a short time. For this reason, it is very difficult to always achieve the ballast water management standard which IMO set, and there exists a possibility that a new damage may arise when trying to satisfy | fill the standard by force.

For example, in order to reliably achieve the standard in Patent Documents 1 to 3, it is necessary to inject an excessive amount of sterilizing agent, and the drug effect remains due to excessive chemical liquid injection, which adversely affects the coating of the ballast tank. Or when the ballast water is drained, it may kill aquatic organisms in the water body.

In addition, in order to reliably achieve the standard in Patent Document 4, it is necessary to add an excessive amount of the agent for forming magnetic flocs, and there is a possibility that the amount of recovered magnetic flocs is unnecessarily increased by the excessive injection of the chemical solution. .

This invention is made | formed in view of such a situation, Comprising: It aims at providing the ballast water treatment system which can always achieve the ballast water management standard prescribed by IMO.

In order to achieve the above object, a first aspect of the present invention is a ballast equipped with a water treatment apparatus mounted on a ship to remove a substance to be removed from the ballast water, and a ballast tank for storing the ballast water treated by the water treatment apparatus. A water treatment system, comprising: a monitoring device for monitoring the water quality of the ballast water; and a control device for controlling operating conditions of the water treatment device based on a monitoring result of the monitoring device. .

In the first aspect of the present invention, since the water quality of the ballast water is monitored and the operating conditions of the water treatment apparatus are controlled based on the result, the ballast water is always constant even when the water quality of the ballast water varies greatly according to the intake conditions. It can be treated with water quality.

Further, according to the first aspect, the water treatment is performed in accordance with the water quality of the ballast water, so that excessive injection or insufficient injection of the chemical liquid used for the water treatment can be prevented. For example, when the sterilization method is used as the water treatment apparatus, excessive injection or insufficient injection of the sterilizing agent can be prevented, and the sterilizing agent can be prevented from applying paint to the ballast tank or to the environment.

According to a second aspect of the present invention, in the first aspect, the water treatment device separates and removes an agglomeration apparatus for agglomerating the substance to be removed by injecting a coagulant into the ballast water and stirring the agglomerated substance. And a separating and removing device.

The second aspect is an agglomeration separation method in which the ballast water to be removed is agglomerated and separated and removed, and it is not necessary to inject a fungicide like the sterilization method, so that the coating of the ballast tank and the load on the environment can be eliminated. As the separation / removal apparatus, gravity sedimentation, pressure flotation, magnetic separation, filter separation and the like can be used.

According to a third aspect of the present invention, in the second aspect, the control device controls the flocculation device based on the monitoring result of the monitoring device to adjust the injection amount of the flocculant.

According to the third aspect, since the injection amount of the flocculant is controlled according to the water quality of the ballast water, the flocculant can be injected without being insufficient. Therefore, the coagulant can be prevented from remaining due to excessive injection of the coagulant, and the environmental load at the time of discharging the ballast water can be minimized.

According to a fourth aspect of the present invention, in the second or third aspect, the separation / removing device is a combination of magnetic separation and filter separation.

According to the fourth aspect, since magnetic separation and filter separation are combined, separation and recovery of aggregates can be performed at high speed and with high accuracy. Moreover, in 4th aspect, it is preferable to mix a magnetic component in the ballast water before aggregation. In addition, it is preferable to perform magnetic separation using magnets, such as a permanent magnet and a superconducting magnet, and it is preferable to use the metal or resin filter of 10-50 micrometers for filter separation.

In the fifth aspect of the present invention, the monitoring device measures and monitors at least one of the turbidity and chromaticity of the ballast water according to any one of the first to fourth aspects.

According to the fifth aspect, since at least one of the turbidity or the chromaticity is measured and monitored, the aquatic concentration in the ballast water can be estimated indirectly. In addition, many general-purpose devices have been developed for turbidimeters and colorimeters, so that water quality can be monitored reliably and at low cost.

According to a sixth aspect of the present invention, in any one of the first to fourth aspects, the monitoring device monitors the ballast number by performing image analysis.

According to the sixth aspect, since the water quality of the ballast water is monitored by image analysis of the ballast water, the concentration of aquatic organisms in the ballast water can be directly obtained.

The seventh aspect of the present invention is the first to sixth aspect, wherein the control device controls the throughput of the water treatment device for processing in unit time.

According to the seventh aspect, the throughput per unit time, i.e., the residence time in the water treatment apparatus, is controlled, so that even when there are many substances to be removed in the ballast water, the substances to be removed can be efficiently removed. For example, when the sterilization type water treatment apparatus is used, the contact time with the sterilizing agent can be controlled by controlling the throughput per unit time. Therefore, even when a high concentration of organisms flows due to red tide or the like, sterilization treatment can be performed efficiently. In the case of using the water treatment apparatus of the flocculation separation method, the residence time in the flocculation apparatus can be controlled by controlling the throughput per unit time. Therefore, even in the case where a high concentration of organisms flows due to red tide or the like, flocculation of aquatic organisms can be reliably performed.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the monitoring device monitors the water quality of the ballast water in the inlet, the outlet, and / or the ballast tank of the water treatment device. It features.

According to the eighth aspect, by monitoring the water quality of the ballast water at the inlet of the water treatment device, the water treatment according to the fluctuation of the water quality of the ballast water at the time of intake can be performed. In addition, by monitoring the water quality of the ballast water at the outlet of the water treatment apparatus, it is possible to cope with a change in performance (deterioration of performance, etc.) of the water treatment apparatus. In addition, by monitoring the water quality of the ballast water in the tank, it is possible to respond to the case where the water quality deteriorates in the tank.

In the ninth aspect of the present invention, in any one of the first to eighth aspects, the ballast number in the ballast tank or the ballast water discharged from the ballast tank to the outside is returned to the water treatment apparatus. The ballast water is reprocessed by the water treatment apparatus.

According to the ninth aspect, it is possible to reprocess the ballast water, for example, when a large amount of to-be-removed material is contained in the ballast water at the time of intake, or when the to-be-removed material cannot be sufficiently removed by water treatment, Alternatively, the ballast water is reprocessed when the substance to be removed has grown in the tank. Thereby, the ballast number can be drained in a state where the criterion is reliably satisfied. In addition, it is preferable to perform reprocessing of ballast water at the time of ship navigation, or at the time of drainage of ballast water.

According to the present invention, since the water quality of the ballast water is monitored and the operating conditions of the water treatment apparatus are controlled based on the result, it is possible to treat the ballast water that differs greatly according to the water intake condition to the desired water quality. Therefore, it is possible to reliably satisfy the drainage standard of the ballast water and to prevent the destruction of the ecosystem due to the drainage of the ballast water.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows 1st Embodiment of the ballast water treatment system which concerns on this invention.
FIG. 2 is a view showing a ballast water treatment system different from FIG. 1.
3 is a view showing the drainage flow in the ballast water treatment system of FIG.
It is a figure which shows 2nd Embodiment of the ballast water treatment system which concerns on this invention.
FIG. 5 is a view showing a ballast water treatment system different from FIG. 4.
FIG. 6 is a diagram illustrating a drainage flow in the ballast water treatment system of FIG. 4.
7 is a table showing the relationship between the aquatic concentration of the ballast water and the chemical liquid concentration.
8 is a table showing the relationship between the turbidity of the ballast water and the amount of the flocculant added.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of the ballast water treatment system which concerns on this invention is described according to an accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of 1st Embodiment of the ballast water treatment system which concerns on this invention is shown typically. The ballast water treatment system 10 shown in FIG. 1 is mounted in the ship 12, and mainly consists of the water treatment apparatus 14, the ballast tank 16, the monitoring apparatus 18, and the control apparatus 20. As shown in FIG.

The water treatment apparatus 14 is an example of a "sterilization method", and is composed of a device group of a physical removal device 22 and a sterilization device 24.

The physical removal device 22 physically removes large aquatic organisms, suspended matter, and the like. For example, a device using a filter, a cyclone, a cavitation, or the like is used alone or in combination. A raw water pipe 26 is connected to the physical removal device 22, and a pump 28 and a valve 30 are disposed in the raw water pipe 26. By driving the pump 28, seawater or fresh water is sucked into the raw water pipe 26, and the liquid is fed to the physical removal device 22. The pump 28 and the valve 30 are connected to the control device 20, and the rotation speed of the pump 28 and the opening degree of the valve 30 are controlled by the control device 20. In addition, depending on the design of the sterilization apparatus 24 of the rear stage, the form which does not provide the physical removal apparatus 22 is also possible. In addition, instead of using the pump 28, seawater or fresh water may be fed using a level difference.

The physical removal device 22 is connected to the ballast tank 16 via the treated water pipe 32, and a sterilizer 24 is installed in the middle of the treated water pipe 32. The sterilizing device 24 is a device for killing small aquatic organisms. For example, a device using sodium hypochlorite, ozone, chlorine dioxide, peracetic acid, hydrogen peroxide, UV, or the like is used alone or in combination. As a specific example of the sterilization apparatus 24, it consists of a chemical | medical agent storage tank (not shown) which stores a sterilizing agent, and the injection device (not shown) which injects this sterilizing agent into a process water piping. Moreover, the form containing the generator (not shown) which generate | occur | produces a disinfectant etc. is also possible.

The treated water from which the aquatic organisms have been removed from the physical removal device 22 and the sterilization device 24 is sent to the ballast tank 16 and stored. Moreover, as a drainage means which drains the ballast water in the ballast tank 16 to the outside, it is the form which drains using the raw water piping 26 and the pump 28, for example, and the drainage piping new to the ballast tank 16 ( (Not shown) to form a drainage.

The raw water pipe 26 (that is, the inlet of the water treatment device 14), the treated water pipe 32 (that is, the outlet of the water treatment device 14), and the ballast tank 16 are respectively provided with sampling pipes 34 and 36. , 38 are connected, and each sampling tube 34, 36, 38 is connected to the monitoring device 18. The monitoring device 18 automatically samples the number of ballasts drawn through the sampling pipes 34, 36, 38, and checks the water quality. Although the method of irradiating water quality is not specifically limited, For example, there exists a method of directly acquiring the image data of the ballast number by photography, and measuring the aquatic organism density directly by image-analyzing the image data. In addition, the water quality may be indirectly obtained by using a turbidimeter for measuring turbidity in water and a colorimeter for measuring chromaticity in water.

The monitoring device 18 is connected to the control device 20, and the data of the monitoring result is transmitted to the control device 20. The control apparatus 20 is connected to the pump 28, the valve 30, the physical removal apparatus 22, and the sterilization apparatus 24, and based on the monitoring result, the physical removal apparatus 22 or the sterilization apparatus 24 is carried out. The operating conditions of, the rotation speed of the pump 28, the opening degree of the valve 30 is adjusted. Thereby, operating conditions of the water treatment apparatus 14, such as the throughput of aquatic organisms and the processing flow volume per unit time, can be controlled.

Next, the operation of the ballast water treatment system 10 configured as described above will be described.

In this embodiment, the ballast number of the raw water piping 26, the ballast number of the process water piping 32, and the ballast number of the ballast tank 16 are sampled. That is, the water quality of the ballast water at the time of intake, the water quality of the ballast water immediately after the process by the water treatment apparatus 14, and the water quality of the ballast water stored in the ballast tank 16 are monitored. And the control apparatus 20 processes the ballast by controlling the operating conditions of the water treatment apparatus 14 according to the quality of the water.

For example, when the water quality of the ballast water (that is, the ballast water at the intake) of the raw water pipe 26 is lowered and the aquatic organism concentration is increased, the amount of the sterilizing agent of the sterilizing device 24 is increased or the pump ( The treatment capacity of the water treatment apparatus 14 is increased by reducing the treatment flow rate by the 28 or the valve 30. On the contrary, when the water quality of the ballast water at the time of intake is improved and the concentration of aquatic organisms is reduced, the amount of disinfectant supplied to the sterilizer 24 is reduced or the treatment flow rate is increased by the pump 28 or the valve 30. This lowers the processing capacity of the water treatment device 14. Thereby, it can respond to the water quality fluctuations of the raw water of ballast water, and can stabilize the water quality of the ballast water after a process. In addition, by controlling the operating conditions of the water treatment device 14 in accordance with the water quality of the raw water of the ballast water, it is possible to prevent excessive injection of the sterilizing agent from the sterilizing device 24, so that the excess sterilizing agent is discharged when the ballast water is drained. It can prevent adverse effects on the local ecosystem.

Similarly, the case where the water quality of the ballast number (that is, the ballast number immediately after the treatment) of the treated water pipe 32 is varied can be coped with. In other words, when the concentration of aquatic organisms increases, the treatment capacity of the water treatment apparatus 14 is increased by increasing the dose of the sterilizing agent of the sterilization apparatus 24 or decreasing the treatment flow rate by the pump 28 or the valve 30. Let's do it. Conversely, when the concentration of aquatic organisms decreases, the amount of disinfectant supplied to the sterilizing device 24 is reduced, or the treatment flow rate of the water treatment device 14 is increased by increasing the treatment flow rate by the pump 28 or the valve 30. Lowers. Thereby, the water treatment apparatus 14 can be feedback-controlled and the water quality of the ballast water after a process can be stabilized. In addition, by comparing the water quality of the ballast water of the raw water pipe 26 and the water quality of the ballast water of the treated water pipe 32, it is possible to respond more quickly and accurately to the water quality fluctuations of the raw water of the ballast water, and thus the ballast after the treatment. The water quality of the water can be further stabilized.

In this embodiment, the water quality of the ballast water in the ballast tank 16 is also monitored, and the water quality of the ballast water in a ballast tank can be monitored. In addition, when the water quality in a ballast tank falls, the method of circulating the ballast water in a ballast tank to the water treatment apparatus 14 for reprocessing, or when draining the ballast water in a ballast tank as mentioned later, 14), the method may be performed by re-processing and draining water, or by disinfecting the inside of the ballast tank by connecting the sterilizer 24 to the ballast tank.

Thus, according to this embodiment, since the water quality of the ballast water was monitored and the operating conditions of the water treatment apparatus 14 were controlled based on the result, even if the water quality of the ballast water differs greatly according to the intake conditions, the ballast water Can always be of constant water quality.

Moreover, according to this embodiment, since water treatment is performed according to the water quality of ballast water, the appropriate amount of chemical liquid according to aquatic organism concentration can be injected. Here, the relationship between aquatic organism concentration and each bactericide is shown in the table of FIG. In this embodiment, an appropriate amount of chemical liquid can be injected based on such a relationship, and it is possible to prevent excessive injection and insufficient injection of the chemical liquid. Therefore, it is possible to prevent load on the ecosystem of the ballast tank 16 or the drainage region due to the remaining of the chemical liquid.

In addition, in the table of FIG. 7, the standard of the aquatic organism A is "the organism having a minimum size of 50 micrometers or more is less than 10 living organisms in 1m <3>", and the standard of the aquatic organism B is "the minimum size is less than 50 micrometers" And 10 micrometers or more are less than 10 living organisms in 1 ml. "

In addition, although the above-mentioned embodiment monitored the water quality of the ballast water in three places (raw water pipe 26, the treated water pipe 32, the ballast tank 16), the position and number to monitor are not limited to this, For example, the water quality of the ballast water may be sampled at one or two of the above.

FIG. 2 is a schematic diagram of a system in which the ballast water treatment system of FIG. 1 has a function of reprocessing the ballast water in the ballast tank 16. In the ballast water treatment system 40 shown in FIG. 2, the circulation line 42 is connected to the ballast tank 16, and the tip of the circulation line 42 is connected to the raw water pipe 26. The circulation line 42 is provided with the pump and valve which are not shown in figure, and this pump and valve are controlled by the control apparatus 20. As shown in FIG. In addition, by connecting the front end of the circulation line 42 to the pipe on the upstream side (left side in FIG. 2) of the pump 28, the pump 28 and the valve 30 may be used at the time of water intake and circulation.

In the ballast water treatment system 40 configured as described above, the water quality of the ballast water in the ballast tank 16 is monitored, and the operating conditions of the water treatment device 14 are controlled based on the monitoring result. For example, when the water quality of ballast water in the ballast tank 16 falls, the ballast water in the ballast tank 16 is circulated to the water treatment apparatus 14 by the circulation line 42, and reprocessing of the ballast water is carried out. Do it. Then, the operating conditions of the water treatment device 14 are controlled according to the water quality of the ballast water in the ballast tank 16, and the ballast water is reprocessed until the water quality becomes less than the allowable value. Thereby, the water quality of the ballast water in the ballast tank 16 can be improved, and it can maintain below the permissible value.

As described above, in the present embodiment, the ballast water in the ballast tank 16 can be circulated and purified, for example, the ballast water can be purified during navigation of the ship.

In addition, in the above-described embodiment, the ballast water in the ballast tank 16 is returned to the front end of the physical removal device 22, but as shown by the circulating line 44 of the two-dot chain line in FIG. You may return to the front end of the sterilization position by 24). In this case, only the sterilization treatment can be reprocessed.

In addition, in the above-described embodiment, the water quality of the ballast water in the ballast tank 16 is monitored and the reprocessing of the ballast water is controlled according to the result, but the water quality of the ballast water in the ballast tank 16 and immediately after the treatment The water quality of ballast water may be compared, and operation conditions at the time of reprocessing may be controlled according to the comparison result. For example, the reprocessing of the ballast water may be stopped when the water quality of the ballast water immediately after the treatment becomes equal to the water quality of the ballast water in the ballast tank 16.

FIG. 3 is a schematic diagram illustrating a flow when draining water in the ballast water treatment system 10 of FIG. 1. In addition, although the drainage flow shown in FIG. 3 is an example which drains using the water treatment apparatus 14, the pump 28, and the valve 30 of FIG. 1, the drainage method is not limited to this, and it is at the time of intake Other water treatment devices, pumps, and valves may be provided for drainage.

The ballast water treatment system 10 shown in FIG. 3 opens the valve 30 and drives the pump 28 so that the ballast water in the ballast tank 16 is drained to the outside through the water treatment apparatus 14. The control apparatus 20 controls the water treatment apparatus 14 according to the monitoring result of the water quality of the ballast water in the ballast tank 16. For example, when the water quality (aquatic concentration) of the ballast water in the ballast tank 16 exceeds the allowable value, the water treatment apparatus 14 is driven to start the reprocessing of the ballast water, and the water quality of the ballast water In accordance with this, the operating conditions of the water treatment device 14 (processing amount, such as the amount of disinfectant injected, and processing flow rate per unit time) are controlled. As a result, the water quality of the discharged ballast water is improved, which is controlled to be below the allowable value and drained.

Thus, according to this embodiment, since the water treatment apparatus 14 was comprised so that it might be arrange | positioned on the discharge line of ballast water, it can reprocess a ballast water at the time of discharge. Therefore, even when the water quality of the ballast water in the ballast tank 16 falls during navigation, the ballast water discharge standard can be satisfied by reprocessing the ballast water at the time of discharge.

In addition, although the ballast water at the time of drainage flows also into the physical removal apparatus 22 in the above-mentioned embodiment, as shown in FIG. 3, the bypass line 46 of the physical removal apparatus 22 is provided, and a physical removal apparatus is provided. The water may be drained without passing through (22).

4 schematically illustrates the configuration of the ballast water treatment system according to the second embodiment. In addition, about the member which has the same function as the ballast water treatment system 10 of 1st Embodiment shown in FIG. 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 4, the ballast water treatment system 50 of 2nd Embodiment compares the water treatment apparatus 52 of a cohesive separation system with the ballast water treatment system 10 of 1st Embodiment shown in FIG. It differs in the point of use. The agglomeration separation type water treatment device 52 aggregates and removes a substance to be removed (aquatic organisms) in ballast water, and as shown in FIG. 4, a chemical addition part 54, agglomeration part 56, and a separation part. It consists of 58.

The chemical | medical agent addition part 54 adds the chemical | medical agent required to aggregate the to-be-removed substance (aquatic organism) in ballast water to ballast water, In this embodiment, the magnetic component addition apparatus 60 and the inorganic flocculant addition apparatus 62 And the polymer flocculant addition device 64 are provided. The magnetic component addition apparatus 60 is comprised so that a magnetic component may be added to the ballast water conveyed to the rapid stirring tank 66 of the flocculation part 56, As a magnetic component, iron tetratrioxide can be used preferably, for example. . The inorganic coagulant adding device 62 is configured to add an inorganic coagulant to the ballast water fed into the rapid stirring tank 66 of the coagulant 56. Examples of the inorganic coagulant include polyaluminum chloride, iron chloride, ferric sulfate, and the like. It can be used preferably. The polymer coagulant adding device 64 is configured to add a polymer coagulant to the ballast water fed from the rapid agitation tank 66 of the agglomeration section 56 to the slow agitation tank 68. As the polymer coagulant, an anionic or nonionic system is used. Etc. can be used preferably. In addition, the kind of chemical agent added is not limited to the above-mentioned embodiment, For example, when the magnetic separation apparatus 72 is not used in the rear part separation part 58, there is no magnetic component addition apparatus 60. Form is also possible.

The agglomeration part 56 is provided with the rapid stirring tank 66 which feeds the ballast water from the raw water piping 26, and the slow stirring tank 68 connected to the rapid stirring tank 66 by the piping 70. As shown in FIG. The rapid stirring tank 66 is comprised so that agitation of a ballast water, a magnetic component, and a flocculant can be rapidly stirred by rotating the stirring blade which is not shown at high speed. It is preferable that the rotational circumferential speed in the tip part of the stirring blade in the rapid stirring tank 66 is about 1 to 2 m / sec, and solid suspended particles in magnetic components and ballast water by using such a rapid stirring tank 66. Microscopic flocs of the order of tens of micrometers in which bacteria, plankton and the like are introduced are formed. The ballast water containing the magnetic floc is sent to the slow stirring tank 68 through the piping 70.

The slow stirring vessel 68 is configured to gently stir the ballast water containing the magnetic flocs and the polymer flocculant by rotating a stirring blade (not shown) at a low speed. The stirring blade in the slow stirring tank 68 is controlled by the rotation circumferential speed slower than the stirring blade in the rapid stirring tank 66. By using such a slow stirring tank 68, a magnetic floc can be grown and a large magnetic floc of several hundred micrometers-about several millimeters of magnetic is formed. The ballast water containing the grown magnetic flocs is fed to the separation unit 58. In addition, in this embodiment, although the condensing part 56 was comprised by the rapid stirring tank 66 and the slow stirring tank 68, the structure of the condensing part 56 is not limited to this, For example, a stirring method differs. Various forms, such as installing some kind of stirring tank, are possible.

Separation unit 58 includes a magnetic separation device 72 and a filter separation device 74. The magnetic separation device 72 adsorbs and separates magnetic flocs in the ballast water by magnetic force. The magnetic separation device 72 separates and removes about 99% or more of the magnetic flocs in the raw water. The treated water treated by the magnetic separation device 72 is delivered to the filter separation device 74. As the filter separating device 74, for example, a rotating drum filter (not shown) having a filter having a hole diameter of 10 to 50 µm is used, and the ballast number is supplied from the inside to the outside by supplying the ballast water to the inside of the rotating drum filter. The solution is fed and filtered to remove small fish, shrimp, and the like that cannot be removed by flocculation. As a result, contaminants such as garbage, solid suspended particles, bacteria, and plankton in the ballast water can be removed, and the ballast water can be purified. The purified ballast water is fed to the ballast tank 16 by the treated water pipe 32 and stored. In addition, the structure of the separation part 58 is not limited to the above-mentioned form, In the form which does not have the filter separation apparatus 74, Instead of the magnetic separation apparatus 72, separation apparatuses, such as sedimentation separation and pressurization separation separation, etc. are used. Various forms, such as the form used, are possible.

In the ballast water treatment system 50 according to the second embodiment described above, the sampling pipes 34, 36, 38 are respectively provided in the raw water pipe 26, the treated water pipe 32, and the ballast tank 16 in the same manner as in the first embodiment. ) Is connected, and each sampling pipe 34, 36, 38 is connected to the monitoring device 18. The monitoring device 18 automatically samples the number of ballasts drawn through the sampling pipes 34, 36, 38, and checks the water quality. Although the method of irradiating water quality is not specifically limited, For example, there exists a method of directly acquiring the image data of the ballast number by photography, and measuring the aquatic organism density directly by image-analyzing the image data. In addition, the water quality may be indirectly obtained by using a turbidimeter for measuring turbidity in water and a colorimeter for measuring chromaticity in water.

The monitoring device 18 is connected to the control device 20, and the data of the monitoring result is transmitted to the control device 20. The control apparatus 20 is connected to the pump 28, the valve 30, the chemical | medical agent addition part 54, and the aggregation part 56, and based on a monitoring result, the chemical | medical agent addition part 54 and the aggregation part 56 are connected. ) Operating conditions, the rotation speed of the pump 28, the opening degree of the valve 30 is adjusted. Thereby, operating conditions of the water treatment apparatus 52, such as the throughput of aquatic organisms and the flow volume of processing per unit time, can be controlled.

According to the second embodiment configured as described above, since the water quality of the ballast water is monitored and the operating conditions of the water treatment apparatus 52 are controlled based on the result, even if the water quality of the ballast water varies greatly according to the water intake conditions. The ballast water can always be of constant water quality.

For example, when the water quality of the ballast water of the raw water piping 26 falls and the aquatic organism concentration becomes large, the chemical | medical agent input amount of the chemical | medical agent addition part 54 is increased, or the stirring effect in the aggregation part 56 is greatly increased. By increasing the amount of flocculation or decreasing the treatment flow rate by the pump 28 or the valve 30, the treatment capacity of the water treatment apparatus 52 is increased. On the contrary, when the water quality of the ballast water at the time of intake is improved and the aquatic organism concentration is reduced, the amount of drug input to the drug addition unit 54 is reduced, or the agitation effect at the flocculation unit 56 is reduced so that the amount of aggregation is reduced. By reducing or increasing the treatment flow rate by the pump 28 or the valve 30, the treatment capacity of the water treatment device 52 is lowered. Thereby, it can respond to the water quality fluctuations of the raw water of ballast water, and can stabilize the water quality of the ballast water after a process. In addition, by controlling the operating conditions of the water treatment device 52 in accordance with the quality of the raw water of the ballast water, it is possible to prevent the chemical agent of the drug adding portion 54 from being added excessively, so as to drain the ballast water. It can prevent adverse effects on the ecosystem.

Similarly, the case where the water quality of the ballast number (that is, the ballast number immediately after the treatment) of the treated water pipe 32 is varied can be coped with. In other words, when the concentration of aquatic organisms increases, the treatment capacity of the water treatment apparatus 52 is increased in the same manner as above, and when the concentration of aquatic organisms decreases, the treatment capacity of the water treatment apparatus 52 is reduced. Thereby, the water treatment apparatus 52 can be feedback-controlled, and the water quality of the ballast water after a process can be stabilized. In addition, by comparing the water quality of the ballast water of the raw water pipe 26 and the water quality of the ballast water of the treated water pipe 32, it is possible to respond more quickly and accurately to the water quality fluctuations of the raw water of the ballast water, and thus the ballast after the treatment. The water quality of the water can be further stabilized.

In this embodiment, the water quality of the ballast water in the ballast tank 16 is also monitored, and the water quality of the ballast water in the ballast tank 16 can be monitored. In addition, when the water quality in the ballast tank 16 falls, the method of circulating and reprocessing the ballast water in the ballast tank 16 to the water treatment apparatus 52, as mentioned later, or in the ballast tank 16, When draining ballast water, it is good to respond by the method of sending to the water treatment apparatus 52, reprocessing, and draining.

As described above, in the second embodiment, since the operating conditions of the water treatment device 52 are controlled in accordance with the water quality of the ballast water, an appropriate amount of flocculant can be added according to the aquatic concentration. Here, the relationship between the turbidity of ballast water and the addition amount of a flocculant is shown in the table of FIG. According to this embodiment, the appropriate amount of flocculant based on such a relationship can be added.

8 shows the case of polyaluminum chloride as an example of an inorganic flocculant.

Moreover, since 2nd Embodiment uses the water treatment apparatus 52 of the aggregation separation system, the bad influence to the ecosystem like the case where a fungicide is used can be prevented. In addition, in the case of using the water treatment apparatus 52 of the flocculation separation method, mud (mud, carcasses, etc.) is not deposited in the ballast tank 16, so that an increase in aquatic life in the mud can be prevented. Therefore, the water quality of the ballast water in the ballast tank 16 can be suppressed from falling.

In addition, although the above-mentioned embodiment monitored the water quality of the ballast water in three places (raw water pipe 26, the treated water pipe 32, the ballast tank 16), the position and number to monitor are not limited to this, The water quality of the ballast water may be sampled at one or two of the above.

FIG. 5 is a schematic diagram of a system in which the ballast water treatment system of FIG. 4 has a function of reprocessing the ballast water in the ballast tank 16. In the ballast water treatment system 80 shown in FIG. 5, the circulation line 82 is connected to the ballast tank 16, and the tip of the circulation line 82 is connected to the raw water pipe 26. The pump and valve which are not shown in figure are provided in the circulation line 82, and this pump and valve are controlled by the control apparatus 20. As shown in FIG. In addition, by connecting the front end of the circulation line 82 to the upstream side (left side of FIG. 5) of the pump 28, the pump 28 and the valve 30 may be used at the time of intake and circulation.

In the ballast water treatment system 80 configured as described above, the water quality of the ballast water in the ballast tank 16 is monitored, and the operating conditions of the water treatment apparatus 52 are controlled based on the monitoring result. For example, when the water quality of the ballast water in the ballast tank 16 falls, the ballast water in the ballast tank 16 is circulated to the water treatment apparatus 52 by the circulation line 82, and reprocessing of the ballast water is performed. It starts. Then, the operating conditions of the water treatment apparatus 52 are controlled in accordance with the water quality of the ballast water in the ballast tank 16, and the ballast water is reprocessed until the water quality becomes below the allowable value. As a result, the water quality of the ballast water in the ballast tank 16 is improved, and controlled below the allowable value.

As described above, in the present embodiment, the ballast water in the ballast tank 16 can be circulated and purified, for example, the ballast water can be purified during navigation of the ship.

In the above-described embodiment, the water quality of the ballast water in the ballast tank 16 is monitored and the reprocessing of the ballast water is controlled according to the result, but the water quality of the ballast water immediately after the treatment and the ballast in the ballast tank 16 are controlled. The water quality of the water may be compared and the operating conditions at the time of reprocessing may be controlled according to the comparison result. For example, the reprocessing of the ballast water may be stopped when the water quality of the ballast water immediately after the treatment becomes equal to the water quality of the ballast water in the ballast tank 16.

FIG. 6: is a schematic diagram which shows the flow at the time of draining in the ballast water treatment system 50 of FIG. In addition, although the wastewater flow shown in FIG. 6 is an example which drains using the water treatment apparatus 52, the pump 28, and the valve 30 of FIG. 4, the drainage method is not limited to this, and it is at the time of water intake. Other water treatment devices, pumps, and valves may be provided for drainage.

The ballast water treatment system 50 shown in FIG. 6 opens the valve 30 and drives the pump 28, and the ballast water in the ballast tank 16 is drained outside through the water treatment apparatus 52. FIG. The control apparatus 20 controls the water treatment apparatus 52 according to the monitoring result of the water quality of the ballast water in the ballast tank 16. FIG. For example, when the water quality (aquatic concentration) of the ballast water in the ballast tank 16 exceeds the allowable value, the water treatment apparatus 52 is driven to start the reprocessing of the ballast water, and the water quality of the ballast water In accordance with this, the operating conditions of the water treatment device 52 (processing amount such as the injection amount of the coagulant or the treatment flow rate of the ballast water per unit time) are controlled. As a result, the water quality of the discharged ballast water is improved, so that the controlled ballast water can be drained below the allowable value.

Thus, according to this embodiment, since the water treatment apparatus 52 was put on the discharge line of ballast water, the water quality can be improved by reprocessing ballast water at the time of discharge. Therefore, even when the water quality of the ballast water in the ballast tank 16 falls during navigation, by reprocessing the ballast water at the time of discharge, it is possible to satisfy the discharge standard of the ballast water.

10: ballast water treatment system
12: ship
14: water treatment device
16: ballast tank
18: sampling device
20: control unit
22: physical removal device
24: sterilization device
26: raw water piping
28: pump
30: valve
32: treatment water piping
34 to 38: sampling tube
40: ballast water treatment system
42: circulation line
44: circulation line
46: bypass line
50: Ballast Water Treatment System
52: water treatment device
54: drug addition unit
56: agglomerated portion
58: separator
60: magnetic component adding device
62: inorganic flocculant addition device
64: polymer flocculant addition device
66: rapid stirring tank
68: slow stirring tank
70: piping
72: magnetic separation device
74: filter separation unit
80: ballast water treatment system
82: circulation line

Claims (9)

In the ballast water treatment system equipped with a water treatment apparatus mounted on a ship and removing a to-be-removed substance from a ballast water, and the ballast tank which stores the ballast water processed by the said water treatment apparatus,
A monitoring device for monitoring the water quality of the ballast water,
And a control device for controlling an operating condition of the water treatment device based on a monitoring result of the monitoring device. The water treatment apparatus of claim 1,
A flocculating device for injecting a flocculant into the ballast water and agglomerating the substance to be removed by stirring;
A ballast water treatment system, comprising: a separation and removal device for separating and removing aggregates generated in the flocculation device. The ballast water treatment system according to claim 2, wherein the control device controls the flocculation device based on the monitoring result of the monitoring device to adjust the injection amount of the flocculant. The ballast water treatment system according to claim 2 or 3, wherein the separation / removal device is a combination of magnetic separation and filter separation. The ballast water treatment system according to any one of claims 1 to 4, wherein the monitoring device measures and monitors at least one of turbidity and chromaticity of the ballast water. The ballast water treatment system according to any one of claims 1 to 4, wherein the monitoring device monitors the ballast number by image analysis. The ballast water treatment system according to any one of claims 1 to 6, wherein the control device controls the throughput of the water treatment device for processing in unit time. The ballast water treatment according to any one of claims 1 to 7, wherein the monitoring device monitors the water quality of the ballast water in the inlet, the outlet, and / or the ballast tank of the water treatment device. system. The water treatment apparatus according to any one of claims 1 to 8, further comprising a line for returning ballast water in the ballast tank or ballast water discharged from the ballast tank to the water treatment apparatus, and returning the ballast water to the water treatment apparatus. A ballast water treatment system, characterized in that it is reprocessed by an apparatus.

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