JP5570889B2 - Ballast water treatment equipment - Google Patents

Description

  The present invention relates to a ballast water treatment apparatus that can take in seawater and ballast water used in a ship such as a tanker, and prevent adverse effects on the environment due to the drainage of ballast water.

  For ships such as tankers, when unloading crude oil, etc. at the unloading port and sailing again to the loading port, the ballast is placed in a specified tank (ballast water tank) in order to balance the ship in operation. It stores seawater called water. The ballast water in the tank is usually pumped up and stored when unloading at the unloading port and drained when loading at the loading port.

  Ballast water taken at the port of unloading may contain toxic microalgae in the seawater, plankton, microbes such as bacteria such as cholera and Escherichia coli (hereinafter referred to as “pests”). If ballast water is discharged as it is at the port, pests will contaminate the sea area near the loading port. Among these pests, especially minute ones can grow in the sea area near the port of loading depending on the environmental conditions and cause great damage such as killing the creatures that originally live in the sea area.

  Various ballast water treatment devices have been proposed in order to prevent water pollution at the loading port due to such ballast water. For example, electrolytic water containing hypochlorous acid generated by electrolyzing seawater is ballasted. By injecting into the water tank, pests in the ballast water taken at the port of discharge will be inactivated or killed before draining at the port of loading, so that the environment of the sea area of the port of loading will not be destroyed by draining the ballast water. There is a ballast water treatment apparatus (see, for example, Patent Document 1).

  In this ballast water treatment device, electrolyzed water containing hypochlorous acid is generated using seawater, and pests in the ballast water are inactivated or killed. Although the equipment cost can be reduced and the running cost can be reduced, the ballast water before the ballast water is drained in order not to kill the organisms that live in the sea area of the loading port by draining the ballast water including electrolyzed water. In addition, the ballast water must be left until the residual chlorine concentration in the ballast water becomes substantially zero, and there is a problem that it takes time to drain the ballast water at the loading port.

  In addition, since the filtration accuracy of seawater used in the electrolyzed water generating device is low, organic matter and minerals in seawater adhere to the electrode surface of the electrolyzed water generating device and the electrolyzed water generation capacity decreases, or electrolyzed water generation Because of this, there is a problem that power consumption increases.

  Accordingly, the applicant of the present patent application provides a water intake channel for taking seawater into a ballast water tank of a ship, a drainage channel for discharging ballast water from the ballast water tank, and a first filtration provided in the water intake channel. A second filtering device provided downstream of the first filtration device of the intake circuit and having a higher filtration accuracy than the first filtration device; and provided downstream of the second filtration device of the intake circuit. Generated by the electrolyzed water generating device for generating electrolyzed water, the chlorine removing device for removing chlorine contained in the ballast water in the ballast water tank provided in the drainage flow path, and the electrolyzed water generating device. There has been proposed a ballast water treatment device provided with a filtration device cleaning means for supplying electrolyzed water to the second filtration device (see Patent Document 2).

  In this ballast water treatment device, when seawater is taken, seawater filtered by the filtration device is supplied as ballast water to a ballast water tank, and a part of the filtered seawater is electrolyzed containing hypochlorous acid by an electrolyzed water generator. It is injected into the ballast water tank as water to inactivate or kill pests in the ballast water, and when ballast water is drained, the chlorine contained in the ballast water is removed by a chlorine removal device, and the ballast water is drained. As a result, the ballast water can be quickly drained while preventing the environment of the sea area of the cargo port from being destroyed.

  Also, while quickly taking in the ballast water through the first filtration device having a low filtration accuracy, the electrolytic water is generated through the second filtration device having a high filtration accuracy, and the second filtration device is washed with the electrolytic water. This prevents the filtration accuracy of the second filtration device from being lowered, and maintains the electrolyzed water generation capability of the electrolysis water generation device over a long period of time so that organic substances and minerals in seawater do not adhere to the electrode surface of the electrolysis water generation device. be able to.

Japanese Patent No. 4262720 Description, claims and drawings attached to the application for Japanese Patent Application No. 2010-038538

  However, in the above-described ballast water treatment apparatus, when seawater is taken, seawater filtered by the filtration apparatus is supplied to the ballast water tank as ballast water, and a part of the filtered seawater is hypochlorous acid by the electrolyzed water generation apparatus. Therefore, the electrolyzed water generating capacity of the electrolyzed water generating device must be capable of generating a large amount of electrolyzed water commensurate with the amount of ballast water in the ballast water tank. As the electrolyzed water generating device is enlarged and the cost is increased, there is a problem that the power consumption is increased.

  Therefore, the present invention uses electrolytic water to efficiently inactivate or kill pests in the ballast water, and quickly discharge the ballast water at the loading port, while reducing the size of the electrolytic water generation unit. The purpose is to reduce power consumption.

For this reason, the ballast water treatment apparatus according to the first aspect of the present invention is provided in a water intake passage for taking seawater into a ballast water tank of a ship, a drain passage for draining ballast water in the ballast water tank, and the water intake passage. The filtration accuracy is higher than that of the first filtration device, the branch flow channel branched from the intake flow channel on the downstream side of the first filtration device, and the first filtration device sequentially provided in the branch flow channel. A high second filtration device, an electrolyzed water generating unit for generating electrolyzed water, an electrolyzed water storage unit for storing electrolyzed water generated by the electrolyzed water generating unit, and drainage from the ballast water tank provided in the drainage channel A chlorine removing device for removing chlorine contained in the ballast water, and controlling the injection of the electrolytic water in the electrolytic water storage section into the water intake flow path when taking in the ballast water, and the chlorine removing device at the time of draining the ballast water Control And a control device, wherein the electrolytic water generating unit circulates the electrolytic water of the second electrolytic bath filtered water is supplied that has passed through the filtering device and the electrode for electrolysis provided in the electrolytic bath the electrolysis tank The electrolyzed water generating unit including the circulation pump and the electrolyzed water storage unit store the overflow of the electrolyzed water generated in the electrolyzed water generating unit from the electrolytic cell, and the second filtration device is plankton. The first filter for removing / reducing E. coli and the like and the second filter for removing / reducing calcium ions, magnesium ions, etc., except for the filtered water supplied to the electrolyzed water generation unit The discharged substances from the first filter and the second filter are respectively returned to the intake flow channel upstream of the electrolyzed water injection part .

  Further, in the invention related to the second ballast water treatment device, in the first invention, the control device is a pump based on a chlorine concentration detected by a chlorine concentration sensor provided in the water intake passage into which the electrolytic water is injected. And controlling the chlorine removing device according to the residual chlorine concentration detected by the residual chlorine concentration sensor provided in the drainage flow path.

  Moreover, the invention which concerns on a 3rd ballast water treatment apparatus WHEREIN: In the 2nd invention, the storage tank which stores filtered water in the branch flow path between the said 2nd filtration apparatus and the said electrolyzed water production | generation part, A pump for supplying filtered water from the storage tank to the electrolyzed water generating unit is provided.

The invention relating to the fourth ballast water treatment device is that, in the first invention, the second filtration device is capable of generating electrolyzed water in the electrolyzed water generating unit while removing and reducing plankton, E. coli and the like of 10 μm or more. It is characterized by passing the required amount of chloride ions.

  According to the present invention, it is possible to efficiently inactivate or kill pests in ballast water using electrolyzed water while reducing the size of the electrolyzed water generating unit and reducing power consumption. When draining ballast water at the port, the chlorine in the ballast water is removed with a chlorine removal device so that the ballast water can be drained quickly, while the ballast water is drained, which destroys the marine environment of the loading port. Can be surely prevented.

It is schematic structure explanatory drawing of the ballast water treatment apparatus applied for description of embodiment of this invention.

  Hereinafter, an embodiment for carrying out the present invention will be described with reference to FIG. In FIG. 1 which shows embodiment of the ballast water treatment apparatus of this invention, 1 is provided in ships, such as a tanker, is divided into several storage chambers, but the ballast water tank which stores the ballast water which each chamber connected, 2 Is a water intake passage 2 for taking seawater into the ballast water tank 1, and the water intake flow passage 2 removes dust, sand, mud, seaweed, etc. of 50 μm or more such as a spring type filter, for example. 1 filtration device 4 is provided. Reference numeral 5 denotes a drainage channel, which has a first drainage channel 5A and a second drainage channel 5B, one end of which is connected to the ballast water tank 1, via the ballast water pump 3 and the drain valve 6. It is the drainage flow path which drains the ballast water of the ballast water tank 1 outside a ship by connecting.

  Reference numeral 7 denotes a branch flow path connected to the branch portion 2A of the intake water flow path 2 on the downstream side of the first filtration device 4. The branch flow path 7 includes an opening / closing valve 8, a water supply pump 9, and a plankton of 10 μm or more. Two stages of a pre-filter 10A (first filter) that removes and reduces most of Escherichia coli and the like, and a nano filter 10B (second filter) that removes and reduces 70 to 80% of impurities such as calcium ions and magnesium ions A second filtering device 10, a storage tank 11, a metering pump 12, and an electrolyzed water generating device 13 are sequentially provided.

  Accordingly, the second filtration device 10 allows passage of chloride ions in an amount necessary for electrolyzed water generation in the electrolyzed water generating unit 13A described later while removing / reducing plankton, E. coli and the like of 10 μm or more. .

  The electrolyzed water generating device 13 includes an electrolyzed water generating unit 13A and an electrolyzed water storage unit 13B. The electrolyzed water generating unit 13A uses an electrolyzer 14 to which filtered water stored in the reservoir 11 is supplied by a metering pump 12, an electrode 15 for electrolysis provided in the electrolyzer 14, and electrolyzed water in the electrolyzer 14. It comprises a circulation pump 16 that prevents impurities such as calcium ions and magnesium ions that could not be removed by the nanofilter 10B by being circulated and adhered to the electrode 15 for electrolysis. The overflow of the electrolyzed water containing hypochlorous acid generated by the generating unit 13A is stored in the electrolyzed water storing unit 13B. In addition, a water level detection electrode 17 is attached to the electrolytic cell reservoir 13B, and an exhaust pipe 18 for discharging a gas such as hydrogen gas or chlorine gas contained in the electrolytic water to the outside of the ship is attached.

  The electrolyzed water stored in the electrolyzer storage part 13B flows downstream from the first filtration device 4 through an electrolyzed water injection pipe 22 in which a flow meter 19, a metering pump 20, and an on-off valve 21 are sequentially provided. It is made to inject | pour into the electrolyzed water injection | pouring part 2B of the intake water flow path 2 further downstream from the branch part 2A of the path | route 2. As shown in FIG. The discharge from the first filtration device 4 is discharged out of the ship via the discharge valve 23 and the second discharge flow path 5B.

  Further, about two-thirds from the nanofilter 10B other than the small dust discharged from the prefilter 10A of the second filtration device 10 via the discharge valve 24 and the filtered water supplied to the storage tank 11 from the nanofilter 10B. The drainage water is returned to the water intake channel 2 via the drainage pipe 25 via the discharge return part 2C between the branch portion 2A of the water intake channel 2 and the electrolyzed water injection part 2B.

  26 is a chlorine concentration sensor provided in the intake flow path 2 on the downstream side of the electrolyzed water injection part 2B, 27 is a residual chlorine concentration sensor provided in the drainage flow path 5A, and 28 is an attachment position of the residual chlorine concentration sensor 27. This is a chlorine removing device in which a neutralizing agent such as an aqueous sodium thiosulfate solution is introduced into the downstream drainage flow path 5A through a pump 29.

  In addition, a control device (not shown) for comprehensively controlling the ballast water treatment device is provided, and a solar battery (not shown) or the like is used as a power source to take in and discharge ballast water and operate the electrolyzed water generating unit 13A. In addition, the electrolyzed water injection is controlled according to the chlorine concentration detected by the chlorine concentration sensor 26, and the chlorine removing device 28 is controlled according to the residual chlorine concentration detected by the residual chlorine concentration sensor 27. For example, the on / off duty control of the pump 29 is performed to control the ratio between the open time and the close time, or the degree of opening of the pump 29, so that the residual chlorine concentration detected by the residual chlorine concentration sensor 27 is adjusted. In response, the chlorine removing device 28 is controlled to control the amount of neutralizing agent charged into the drainage flow path 5A.

  When the ballast water pump 3 is operated when crude oil or the like is unloaded at the unloading port, a part of the seawater filtered by the first filtration device 4 of the intake channel 2 (the flow rate of the intake channel) 1/500 or more) enters the branch flow path 7 from the branch section 2A, enters the prefilter 10A of the second filtration device 10 via the on-off valve 8 and the water supply pump 9, where most of plankton, E. coli, etc. Removed and reduced. Then, it further enters the nanofilter 10B, where 70 to 80% of impurities such as calcium ions and magnesium ions are removed and reduced. And the filtered water which passed nano filter 10B is stored in the storage tank 11, and is sent to the electrolytic tank 14 of the electrolytic water production | generation part 13A via the metering pump 12. FIG.

  The nanofilter 10B has high filtration accuracy, and the remaining two-thirds of water other than filtered water is drained to the water intake flow path 2 through the drain pipe 25, so that the water intake amount of 500 flows into the branch flow path 7. The flow rate of filtrate water passing through the nanofilter 13B is slightly more than 1 / 1500th of the flow rate of the intake channel 2 because it is one third or more and one third of that passes through the nanofilter 10B. However, since the filtered water is temporarily stored in the storage tank 11 and is sent from the storage tank 11 to the electrolytic tank 14 by the metering pump 12, the filtered water can be stably supplied from the second filtering device 10 to the electrolytic tank 14. it can.

  The filtered seawater supplied to the electrolyzer 14 of the electrolyzed water generator 13A becomes electrolyzed water containing hypochlorous acid by the electrode 15 for electrolysis, and this electrolyzed water overflows from the electrolyzer 14 and enters the electrolyzer reservoir 13B. Stored. Moreover, the electrolyzed water in the electrolyzer 14 is one in which impurities such as plankton, Escherichia coli, calcium ions, and magnesium ions have already been removed / reduced at the nano level by the second filtration device 10, and the electrolyzed water in the electrolyzer 14 is Since it is circulated by the circulation pump 16 (electrolysis is performed while being circulated), impurities such as calcium ions and magnesium ions slightly remaining in the electrolytic cell 14 become scales and do not adhere to the electrode 15 for electrolysis. The electrode 15 for electrolysis of the electrolyzed water generator 13 can be used satisfactorily for a long time.

  Electrolyzed water containing hypochlorous acid in the electrolytic cell reservoir 13B is injected into the intake flow path 2 through the flow meter 19, the metering pump 20 and the on-off valve 21 of the electrolytic water injection pipe 22 and the electrolytic water injection part 2B. The And it mixes with most seawater which passed the 1st filtration apparatus 4 here, and becomes ballast water containing electrolyzed water, and is supplied to the ballast water tank 1. FIG. For this reason, the electrolyzed water generating unit 13A can be made smaller than the conventional electrolyzed water generating device that generates a large amount of electrolyzed water and supplies it to the ballast water tank 1. Can be used. Moreover, since the electrolyzed water produced by the electrolyzed water generating unit 13A is stored in the electrolyzed water storage unit 13B and injected into the water intake channel 2 by the metering pump 20, the electrolyzed water can be stably supplied to the water channel 2. it can.

  In this way, a part of the seawater that has passed through the first filtration device 4 of the intake flow channel 2 is diverted to the branch flow channel 7, where it is filtered to the nano level by the second filtration device 10, and then electrolyzed water Electrolyzed water containing hypochlorous acid is generated in the generating unit 13A, stored in the electrolyzed water storage unit 13B, injected into the water intake channel 2, and electrolyzed with most seawater filtered by the first filtering device 4. Since the water is mixed and supplied to the ballast water tank 1 as ballast water, a small amount of the electrolyzed water is taken in compared with the case where the electrolyzed water containing hypochlorous acid is directly injected into the ballast water tank 2. The pests in the ballast water can be inactivated or killed while being injected into the battery, so that the electrolyzed water generator 13A can be downsized and the power consumption can be reduced.

  In addition, the control device controls the intake of the ballast water, the operation of the electrolyzed water generation unit 13 and the control of the injection of the electrolyzed water, and the chlorine concentration detected by the chlorine concentration sensor 26 becomes a high concentration (10 mg / L or more). When the metering pump 20 is stopped, the on-off valve 21 is closed so that high-concentration electrolyzed water is not excessively injected, and the chlorine concentration detected by the chlorine concentration sensor 26 decreases to some extent (for example, 1 mg / L). Since the injection of the electrolyzed water is resumed, the electrolyzed water can be injected in the water intake flow path 2 at the time of water intake appropriately and efficiently.

  Further, the discharged water from the prefilter 10A and the nanofilter 10B other than the filtered water supplied to the electrolytic water generating unit 13A is not discharged to the outside, and the electrolytic water injection unit of the water intake passage 2 passes through the discharge pipe 25. Since it is returned to the waste return part 2C upstream of 2B, pests and the like contained in these wastes can be inactivated or killed by the electrolyzed water.

  When the ballast water pump 3 is operated at the loading port, the ballast water in the ballast water tank 1 is pumped up and out of the ship through the drainage channel 5A, the ballast water pump 3, the open drain valve 6 and the drain channel 5B. Discharged. At this time, the residual chlorine concentration contained in the ballast water flowing through the discharge channel 5A is detected by the residual chlorine concentration sensor 27, and an amount of neutralizing agent according to the residual chlorine concentration detected by controlling the drive of the pump 29. Is introduced into the drainage flow path 5A from the chlorine removing device 28, so that the residual chlorine contained in the ballast water is efficiently removed by charging an appropriate amount of the neutralizing agent from the chlorine removing device 28, and the ballast water is drained. Ballast water can be discharged quickly without destroying the environment of the sea area of the loading port.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention is not limited to the various alternatives described above without departing from the spirit of the present invention. It includes modifications or variations.

DESCRIPTION OF SYMBOLS 1 Ballast water tank 2 Water intake flow path 2A Branch part 2B Electrolyzed water injection | pouring part 2C Waste return part 4 1st filtration apparatus 5 Drain flow path 7 Branch flow path 10 2nd filtration apparatus 10A Prefilter 10B Nano filter 11 Reservoir DESCRIPTION OF SYMBOLS 12 Metering pump 13 Electrolyzed water production | generation apparatus 13A Electrolyzed water production | generation part 13B Electrolyzed water storage part 14 Electrolyzer 15 Electrode 22 Electrolysis water injection pipe 26 Chlorine concentration sensor 27 Residual chlorine concentration sensor 28 Chlorine removal apparatus

Claims (4)

A water intake passage for taking seawater into a ballast water tank of a ship, a drain passage for draining ballast water in the ballast water tank, a first filtration device provided in the water intake passage, and the first filtration A branch flow path branched from a water intake flow path on the downstream side of the apparatus, a second filtration apparatus having higher filtration accuracy than the first filtration apparatus sequentially provided in the branch flow path, and electrolyzed water for generating electrolyzed water A generation unit and an electrolyzed water storage unit that stores electrolyzed water generated by the electrolyzed water generation unit, and a chlorine removal device that removes chlorine contained in the ballast water provided in the drainage channel and drained from the ballast water tank And a controller for controlling the injection of the electrolyzed water from the electrolyzed water reservoir into the water intake flow path when taking the ballast water and controlling the chlorine removing device when draining the ballast water , the electrolyzed water generating unit Said An electrolyzed water generation unit comprising an electrolyzer supplied with filtered water through the filtration device, an electrode for electrolysis provided in the electrolyzer, and a circulation pump for circulating the electrolyzed water in the electrolyzer; The unit stores the overflow of the electrolyzed water generated by the electrolyzed water generating unit from the electrolytic cell, and the second filter device removes and reduces plankton, Escherichia coli, etc., the first filter and calcium ions, It consists of a two-stage filter of a second filter that removes and reduces magnesium ions, etc., and the discharge from the first filter and the second filter other than the filtrate supplied to the electrolyzed water generating unit is electrolyzed. A ballast water treatment device, wherein the ballast water treatment device is configured to return to the intake flow channel upstream of the water injection portion . The control device controls the injection of electrolyzed water by a pump based on the chlorine concentration detected by a chlorine concentration sensor provided in the water intake passage into which electrolyzed water is injected, and the residual chlorine concentration provided in the drainage passage. The ballast water treatment device according to claim 1, wherein the chlorine removal device is controlled in accordance with a residual chlorine concentration detected by a sensor. A branch passage between the second filtration device and the electrolyzed water generation unit is provided with a storage tank for storing filtered water, and a pump for supplying the filtered water from the storage tank to the electrolyzed water generation unit. The ballast water treatment apparatus according to claim 2. The second filtration device, according to claim 1, characterized in that 10μm or plankton, while removing and reducing Escherichia coli, etc., to pass the amount of chloride ions required for producing electrolyzed water in said electrolytic water generator The ballast water treatment device described in 1.

Images