JP2012106224A - Ballast water control method and ballast water treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ballast water treatment system and a ballast water control method.SOLUTION: In the ballast water treatment system having a ballast water supply line for supplying liquid taken from a water take-in port to a ballast tank, and a drug solution supply device which supplies a sodium hypochlorite aqueous solution for sterilizing an aqueous microorganism to the line, the control method of the ballast water includes steps for: sampling the drug solution in the line supplied with a prescribed amount of the sodium hypochlorite from the drug solution supply device; measuring the attenuation of a concentration of sodium hypochlorite in a sampled test piece; and adjusting a supply amount of the sodium hypochlorite supplied to the line from the drug solution supply device on the basis of the measured data. The ballast water treatment system uses the control method.

Description

  The present invention relates to a ballast water control method and a ballast water treatment system.

  In ships such as tankers and large cargo ships, when navigating in a state where oil or cargo is not loaded or in a small amount, the ballast water is usually placed in the ballast tank to ensure the stability and balance of the ship. Contained and sailed. This ballast water is usually pumped and injected into seawater at the port where it is unloaded and discharged at the port where it was loaded. In this way, ballast water uses the seawater of the port where it was unloaded, so the ballast water contains aquatic microorganisms that inhabit the area around the port where it was unloaded, and discharged along with the ballast water at the port where this aquatic microorganism was loaded. Is done.

  In recent years, disturbance of the ecosystem due to discharge of ballast water containing aquatic microorganisms has become an international problem. For this reason, the International Maritime Organization (IMO) adopted the Ballast Water Management Convention in 2004, in which the emission standards for organisms that inhabit the discharged ballast water are strictly set.

  Various methods for treating ballast water have been proposed. Specifically, a method for removing aquatic microorganisms by filtration, centrifugation, etc., a method for physically and mechanically killing aquatic microorganisms, a method for killing aquatic microorganisms by heat, and injecting chemicals into a ballast tank Or a method of killing aquatic microorganisms by generating chlorine-based substances or the like (for example, Patent Document 1 and Non-Patent Document 1), a method combining these methods, and the like.

  On the other hand, even if aquatic microorganisms in the ballast water can be eliminated, depending on the concentration of sodium hypochlorite remaining in the wastewater, the environment around the harbor may be destroyed. Therefore, at the time of discharge, a method of neutralizing the ballast water by adding a reducing agent according to the sodium hypochlorite concentration, etc., or a method of leaving the ballast water to make the residual chlorine concentration in the ballast water substantially zero (patent Document 2) has been proposed.

JP-T-2007-515289 Japanese Patent No. 4262720

Yukihiko OKAMOTO et al., JFE Technique No.25 (February 2010) p.1-6

  As mentioned above, the adoption of the Ballast Water Management Treaty obligates the installation of ballast water treatment equipment, and there has been a further demand for new technology that can treat ballast water. Among them, if sodium hypochlorite is excessive in the ballast water, a reducing agent is required at the time of discharge, or it takes time to leave, so sodium hypochlorite in the ballast water. New technologies related to concentration control are expected. Therefore, the present invention provides a new treatment system capable of controlling the sodium hypochlorite concentration of ballast water.

  The present invention provides a ballast water supply line for supplying liquid taken from an intake port to a ballast tank, and a chemical solution for supplying sodium hypochlorite aqueous solution for sterilizing aquatic microorganisms in the liquid to the line In a ballast water treatment system comprising a supply device, the liquid in the line to which a predetermined amount of sodium hypochlorite has been supplied from the chemical solution supply device is sampled, and the sodium hypochlorite concentration in the sampled sample is attenuated. The present invention relates to a ballast water control method including measuring and adjusting a supply amount of sodium hypochlorite supplied from the chemical solution supply device to the line based on the measurement data.

  The present invention also includes a ballast water supply line connected to the ballast tank from the water intake, and sodium hypochlorite for sterilizing aquatic microorganisms in the liquid connected to the line and taken from the water intake A chemical solution supply device that supplies an aqueous solution to the line, a connection point between the line and the chemical solution supply device, and a ballast tank, and measures the sodium hypochlorite concentration by sampling the liquid in the line Attenuation measurement unit, a recording unit for recording data measured by the attenuation measurement unit, and the amount of sodium hypochlorite supplied to the line from the chemical solution supply device through the connection point in the ballast water injection water A control unit that controls, based on the decay rate data of sodium hypochlorite, when the ballast water injection is completed, a predetermined time has elapsed, and / or Predict the sodium hypochlorite concentration in the ballast tank when ballast water is discharged, determine the increase or decrease in the amount of sodium hypochlorite supplied from the chemical supply device, and determine the amount of sodium hypochlorite supplied to the line The present invention relates to a ballast water treatment system including controlling.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that the sodium hypochlorite density | concentration of the ballast water in a ballast tank can be controlled, inject | pouring ballast water. In addition, according to the present invention, it is preferable that the sodium hypochlorite concentration can be controlled according to the liquid taken. Furthermore, according to the present invention, there is an effect that it is possible to avoid excessive use of sodium hypochlorite in the ballast tank and use of a large amount of reducing agent for drainage or leaving it over time. Play.

FIG. 1 is a schematic configuration diagram illustrating an example of a ballast water treatment system in the first embodiment. FIG. 2 is a schematic configuration diagram illustrating an example of the configuration of the chemical solution supply apparatus. FIG. 3 is a functional block diagram showing a configuration example of the ballast water control system in the second embodiment. FIG. 4 is a functional block diagram illustrating a configuration example of the measurement unit and the control unit and an example of data recorded in the recording unit. FIG. 5 is a flowchart showing an example of a ballast water treatment method in the ballast water treatment system of the first embodiment. FIG. 6 is a graph showing an example of a decay curve of sodium hypochlorite. FIG. 7 shows an example of the configuration of a sodium hypochlorite attenuation measurement unit. FIG. 8 is a schematic configuration diagram illustrating an example of a ballast water treatment system in the third embodiment. FIG. 9 is a schematic configuration diagram illustrating an example of a ballast water treatment system in the fourth embodiment.

  In the present invention, the degree of attenuation of sodium hypochlorite for sterilizing aquatic microorganisms in ballast water varies depending on the liquid to be treated. That is, the attenuation of sodium hypochlorite is, for example, the intake of seawater It is based on the knowledge that it is influenced by the type and amount of microorganisms and organic matter. Furthermore, the present invention measures the decay of sodium hypochlorite using the taken-up liquid, and controls the supply amount of sodium hypochlorite using the decay data, so that the inside of the ballast tank after completion of water injection This is based on the knowledge that sodium hypochlorite concentration of ballast water can be controlled more accurately.

  Accordingly, in one aspect, the present invention is a ballast water control method for sterilizing a ballast water supply line for supplying a liquid taken from a water intake to a ballast tank, and aquatic microorganisms in the liquid. In the ballast water treatment system comprising a chemical solution supply device that supplies the sodium hypochlorite aqueous solution to the line, the liquid in the line to which a predetermined amount of sodium hypochlorite has been supplied from the chemical solution supply device is sampled. Measuring the decay of sodium hypochlorite concentration in the sampled sample, and adjusting the amount of sodium hypochlorite supplied from the chemical supply device to the line based on the measurement data It relates to a control method.

  According to the ballast water control method of the present invention, the reference sodium hypochlorite supply amount initially added to the taken-up liquid is not excessive or insufficient with respect to the target concentration range in the ballast water after water injection. It is possible to control the sodium hypochlorite concentration according to the taken-in liquid by making a decision while injecting and adjusting the supply amount to be added to the taken-in liquid. Therefore, according to the present invention, sodium hypochlorite is insufficient in the ballast tank and the bactericidal effect is not exhibited, or a large amount of reducing agent or a long time is discharged during drainage due to excessive sodium hypochlorite. There is an effect that it is possible to avoid the necessity of leaving it.

  In this specification, “liquid taken from a water intake (including simply“ liquid taken ”)” is taken from outside the ship, stored in a ballast tank, and used as ballast water. , Brackish water and fresh water. The liquid may be, for example, a liquid containing sodium chloride such as seawater, or may not contain it. Moreover, the area | region where water is taken in is not restrict | limited, A seawater area may be sufficient, and a freshwater area or a brackish water area may be sufficient. In the present specification, “ballast water” refers to a liquid stored in a ballast tank, and may include a liquid taken from a water intake for storing in the ballast tank. Moreover, in this specification, a water intake includes a sea chest.

  In the present specification, “sterilization treatment of aquatic microorganisms” includes sterilizing at least a part of the aquatic microorganisms contained in the liquid to be treated and / or ballast water and / or suppressing the growth of aquatic microorganisms. Further, in this specification, “sterilization treatment of aquatic microorganisms” means that at least aquatic microorganisms may be sterilized, and together with the sterilization treatment of aquatic microorganisms, sterilization treatment of organisms larger than the aquatic microorganisms, other organisms, etc. May be. The sterilization treatment of aquatic microorganisms preferably includes managing the sodium hypochlorite concentration in the ballast tank so that the ballast water discharge standard shown in Table 1 below is satisfied when discharging the ballast water, Including sterilization so as to satisfy the ballast water discharge criteria shown in Table 1 below when discharging the ballast water.

  As used herein, “aquatic microorganisms” include microorganisms that inhabit the sea, rivers, lakes, and the like, and can include microorganisms that can inhabit estuaries, rivers, canals, and the like connected to the sea. The aquatic microorganisms include, for example, relatively small-sized aquatic organisms such as yeast, mold, plant or zooplankton, plankton eggs and spores, bacteria, fungi, viruses, and algae.

  In the present specification, the “chemical solution supply device” is a device that supplies a sodium hypochlorite aqueous solution to the collected liquid and / or ballast water, and a form of a device that generates sodium hypochlorite by electrolysis or The form of the apparatus which stores sodium hypochlorite or its aqueous solution may be sufficient. Examples of the chemical solution supply apparatus using electrolysis include a mode including an electrolytic cell and a storage tank as described later. Since the chemical supply device using electrolysis can produce sodium hypochlorite using seawater, for example, aquatic microorganisms can be used without using special chemicals such as disinfectants brought in from outside the ship. Can be sterilized. Supply of seawater or the like to the storage tank may be performed from a ballast water supply line via a pump or a valve, or may be directly taken from outside the ship. It is preferable to take water directly instead of from the ballast water supply line from the viewpoint of easily taking water during navigation. Moreover, the produced | generated sodium hypochlorite is stored by the storage tank with the form of aqueous solution, and is supplied to a ballast water supply line via a pump or a valve | bulb. The chemical supply device can measure the concentration of sodium hypochlorite so that the amount of sodium hypochlorite supplied to the ballast water supply line can be measured (hereinafter referred to as “sodium hypochlorite concentration meter” or “ It is preferable to provide a flow meter.

  Moreover, it is preferable that the chemical | medical solution supply apparatus using electrolysis is equipped with a sodium chloride aqueous solution storage tank and / or a sodium chloride storage tank from the point of processing efficiency improvement. By providing the sodium chloride aqueous solution storage tank and / or the sodium chloride storage tank, the sodium chloride aqueous solution / sodium chloride can be stored in the tank, and the sodium chloride aqueous solution / sodium chloride can be supplied to the electrolytic cell as necessary. Thereby, even if it is a ship which takes in ballast water in a fresh water area, for example, sodium hypochlorite can be generated and sterilization processing by sodium hypochlorite can be performed.

  In this specification, “ship” refers to a general ship including a ballast tank, and includes, for example, a container ship, a low-low ship, a tanker, and a bulk carrier.

  In this specification, “navigation data” refers to data including navigation time, time to drainage, water quality at the intake port, weather conditions in the navigational sea area, and / or information relating to these obtained during navigation.

  In this specification, “attenuation of sodium hypochlorite” means that the concentration of sodium hypochlorite in the ballast water that has been supplied with sodium hypochlorite from the chemical supply device is reduced. FIG. 6 shows an example of the decay curve of sodium hypochlorite. The solid curve in FIG. 6 shows the change in sodium hypochlorite concentration in the model seawater. In general, when sodium hypochlorite is dissolved in seawater, it first shows a sharp drop in concentration (time 0 to time t3). Thereafter, a substantially plateau concentration (dx) is exhibited (time t3).

  However, the degree of sodium hypochlorite decay is also affected by the type and amount of microorganisms, organics, and / or other water components in the drawn liquid. The dotted line curve in FIG. 6 is an example in the case where the concentration (dy) at the time of almost plateau in the actually drawn seawater is lower by Δd than the model seawater. In addition, although FIG. 6 demonstrates the case where the magnitude | size of attenuation in the seawater actually taken is larger than model seawater, the degree of attenuation in the taken seawater may be smaller than model seawater. Therefore, even if sodium hypochlorite is supplied only according to the expected attenuation (attenuation in model seawater), there is a concentration difference Δd when a plateau is reached with the seawater actually taken. The sodium hypochlorite concentration may be insufficient or excessive.

  Therefore, in order to more accurately predict or control the sodium hypochlorite concentration of ballast water at the completion of ballast water injection, it is important to know the degree of sodium hypochlorite reduction in the drawn water. Become. Thus, one form of the ballast water control method of the present invention is to measure the attenuation of sodium hypochlorite in the ballast water poured in parallel while pouring the ballast water, and based on the measurement data, the chemical solution Adjusting the amount of sodium hypochlorite supplied from the supply device to the line. The adjustment of the supply amount is based on predicting the sodium hypochlorite concentration in the ballast tank when the ballast water injection is completed, when a predetermined time has elapsed, and / or when the ballast water is discharged, based on the attenuation measurement data. Based on the determination, increase / decrease in the amount of sodium hypochlorite supplied from the chemical supply device to the ballast water supply line, and control the amount of sodium hypochlorite supplied to the line based on the determination. Can include.

  Specifically, the adjustment of the supply amount from the chemical solution supply device based on the attenuation data of sodium hypochlorite can be performed as follows, for example. Decay of sodium hypochlorite using model seawater can be measured in advance, so the initial supply amount of sodium hypochlorite to be supplied is determined based on this model measurement data and information such as the flow rate of the liquid to be taken it can. Next, attenuation is measured using the taken-in liquid and compared with model measurement data measured in advance, for example, Δd in FIG. 6 is calculated. Based on these data, the supply amount is increased if the degree of attenuation is high, and the supply amount is decreased if the degree of attenuation is low. By performing such adjustment, the sodium hypochlorite concentration in the ballast tank can be kept within the target range.

  Attenuation of sodium hypochlorite in the drawn liquid can be achieved by measuring the concentration of sodium hypochlorite at predetermined intervals. For example, it is possible to obtain attenuation data by measuring at a time t1 to t6 shown in FIG. Examples of the measurement interval include 20 minutes to 1.5 hours, preferably 30 minutes to 1 hour. The number of measurements is preferably in a range where an attenuation curve can be predicted from the necessity of performing attenuation measurement in parallel with water injection into the ballast tank and adjusting the concentration of hypochlorous acid supplied as necessary. FIG. 6 illustrates six measurements from t1 to t6, but the number of measurements can be reduced if an attenuation curve can be predicted.

  In one embodiment of the ballast water control method of the present invention, sodium hypochlorite decay measurement is performed by sampling the ballast water in the ballast water supply line after sodium hypochlorite is supplied from the chemical supply device. . Therefore, the sampling point of the sample to be measured for attenuation is preferably a ballast water supply line between the connection point between the chemical solution supply device and the ballast water supply line and the ballast tank. Moreover, it is preferable that the said sampling and attenuation | damping measurement are performed by the attenuation | damping measurement unit provided with the concentration meter of sodium hypochlorite. In one embodiment, sampling is performed only once after the start of water pouring, and the method for controlling ballast water of the present invention can be performed by obtaining attenuation data of sodium hypochlorite based on this sample. In other embodiments, sampling can be performed a plurality of times to obtain attenuation data of a plurality of sodium hypochlorites and perform the ballast water control method of the present invention. When sampling is performed multiple times, measurement can be performed by exchanging samples using one attenuation measurement unit, or multiple samples sampled simultaneously or at different times using multiple attenuation measurement units can be measured in parallel. Can be measured.

  As another aspect, the present invention relates to a method for injecting ballast water, which includes controlling the concentration of sodium hypochlorite in the ballast water by the method for controlling ballast water of the present invention.

  Moreover, this invention relates to the ballast water treatment system which can perform the control method of the ballast water of this invention, and a ship provided with this ballast water system as another aspect.

  That is, the present invention includes, as other aspects, a ballast water supply line that connects a water intake and a ballast tank, and a sodium hypochlorite aqueous solution that is connected to the line and sterilizes aquatic microorganisms in the liquid. A chemical solution supplying device for supplying to the line, a connection point between the line and the chemical solution supplying device, and a ballast tank, and sampling the liquid in the line to measure the sodium hypochlorite concentration. Controls the amount of sodium hypochlorite supplied to the line from the chemical solution supply device through the connection point in the ballast water injection water in the measurement unit, the recording unit for recording the data measured by the attenuation measurement unit A control unit, the control unit based on the decay rate data of sodium hypochlorite, when the ballast water injection is completed, when a predetermined time has elapsed, and / or Predict the sodium hypochlorite concentration in the ballast tank when ballast water is discharged, determine the increase or decrease in the amount of sodium hypochlorite supplied from the chemical supply device, and determine the amount of sodium hypochlorite supplied to the line The present invention relates to a ballast water treatment system including controlling.

  The control unit further includes at least an integrated water injection amount of ballast water, an integrated supply amount of sodium hypochlorite, navigation data, and a predetermined sodium hypochlorite concentration to be maintained in the ballast tank before the control. The prediction and / or the determination may be made based on one. Furthermore, ballast water may exist in the ballast tank water before pouring. For this reason, the ballast tank is equipped with an instrument that can measure the capacity of ballast water such as a liquid level gauge, and an instrument that can measure the sodium hypochlorite concentration in the ballast tank, and includes the above information and the prediction and / or Preferably, the determination is made.

  Hereinafter, the present invention will be described in detail with reference to preferred embodiments. However, the present invention is not limited to the embodiments described below.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram showing a configuration of a ballast water treatment system in Embodiment 1 of the present invention.

  As shown in FIG. 1, the ballast water treatment system of the first embodiment includes a chemical solution supply device 101 and an attenuation measurement unit 102. The chemical solution supply apparatus 101 is connected to a ballast water supply line 107 via lines 108 and 109. The line 108 is a line for supplying the liquid (ballast water) taken before the sodium hypochlorite aqueous solution in the ballast water supply line 107 is added to the chemical supply apparatus 101. The line 109 is a line for supplying a sodium hypochlorite aqueous solution from the chemical solution supply apparatus 101 to the ballast water supply line 107. It should be noted that a liquid (seawater or the like) may be directly taken in from the outside by the line 110 instead of the line 108 for transporting the liquid taken from the ballast water supply line 107 to the chemical liquid supply apparatus 101. Lines 108-110 may be equipped with a pump for feeding liquid. Further, the line 109 preferably includes a sodium hypochlorite concentration meter and a flow meter for measuring the amount of sodium hypochlorite supplied to the ballast water supply line 107, and the flow meter has a total flow rate. An integrated flow meter FM that can be measured is preferable. In addition, in FIG. 1, although the lines 108-110 each show the form provided with the pump, this invention is not restricted to this form, For example, it replaces with these pumps and is incorporated in the chemical | medical solution supply apparatus 101. The liquid may be transported by a pump (not shown). The line 109 may be connected to the sea chest 104 instead of the ballast water supply line 107.

  One end of the ballast water supply line 107 is connected to the ballast tank 103. Usually, the ballast tank 103 is a form including a plurality of ballast tanks 103a to 103d. The other end of the ballast water supply line 107 is connected to a water intake (sea chest) 104, a strainer 105, and a ballast pump 106 that take in the ballast water. In addition, a flow meter (FM), a sodium hypochlorite concentration meter (C), between the connection point between the line 109 where sodium hypochlorite is shared and the ballast water supply line 107 and the ballast tank 103, And the attenuation measurement unit 102 is arranged.

  The attenuation measurement unit 102 samples the ballast water from the line 111 after the start of the ballast water injection, and repeatedly measures the sodium hypochlorite concentration over time. As described above, by measuring in this way, it is possible to analyze how sodium hypochlorite is reduced in the taken-up liquid and to adjust the amount of sodium hypochlorite supplied from the line 109. In addition, while the attenuation measurement unit 102 is measuring the attenuation, it is possible to continue without stopping the water injection of the ballast water, thereby preventing time loss.

  As the chemical liquid supply apparatus 101 using electrolysis, for example, a chemical liquid supply apparatus 201 shown in FIG. 2 can be used. FIG. 2 is a schematic configuration diagram showing an example of the configuration of an apparatus capable of sterilizing aquatic microorganisms using electrolysis. As shown in FIG. 2, the chemical solution supply apparatus 201 includes a storage tank 211 and an electrolytic tank 212. The storage tank 211 and the electrolytic tank 212 are connected by lines 213 and 214. The liquid in the storage tank 211 is conveyed to the electrolytic tank 212 through the line 213, and sterilization processing by electrolytic treatment is performed in the electrolytic tank 212. Next, the liquid processed in the electrolytic bath 212 is transferred to the storage bath 211 through the line 214. It is preferable that the storage tank 211 and the electrolytic tank 212 are circulated by lines 213 and 214 from the viewpoint of generating and storing sodium hypochlorite.

  Since such a chemical solution supply apparatus 201 uses electrolytic treatment, for example, it is possible to sterilize aquatic microorganisms in a liquid without using special chemicals such as a bactericide brought in from the outside of the ship. it can. In the electrolytic bath 212, it is preferable that sodium hypochlorite is generated by electrolytic treatment of sodium chloride contained in the liquid, and the aquatic microorganisms in the liquid are sterilized using the generated sodium hypochlorite.

  In the chemical solution supply apparatus 201, a storage tank 211 is a tank for storing unprocessed and / or processed liquid, and the storage tank 211 includes a line 213 for introducing a liquid for electrolysis and a post-electrolysis liquid. Each is connected to a line 214 for discharging liquid. The reservoir 211 can be connected to the lines 108, 109, and 110.

  The storage tank 211 is preferably provided with a sodium hypochlorite concentration meter. Thereby, while being able to manage the sodium hypochlorite density | concentration in the storage tank 211, according to the sodium hypochlorite density | concentration in the storage tank 211, for example, the quantity of the liquid supplied to the storage tank 211, the electrolysis tank 212, and It is possible to control the ballast water treatment in the chemical liquid supply device 201 such as the amount of liquid conveyed to the ballast water supply line 107.

  The ballast water treatment system according to the first embodiment is further supplied to the line from the chemical solution supply device through the connection point into the recording unit that records data measured by the attenuation measurement unit and the ballast water injection water. It is preferable to provide a control unit that controls the amount of sodium hypochlorite. The control unit predicts the sodium hypochlorite concentration in the ballast tank when the ballast water injection is completed, the predetermined time has elapsed, or the ballast water is discharged based on the decay rate data of sodium hypochlorite, An increase or decrease in the amount of sodium hypochlorite supplied from the supply device can be determined, and the amount of sodium hypochlorite supplied to the line can be controlled.

  As the attenuation measurement unit, for example, a device as shown in FIG. 7 can be used. In the attenuation measurement unit 102 of FIG. 7, the sample sampled from the ballast water supply line 107 is poured into the container 701 through the line 111. The attenuation measurement unit 102 includes a stirrer 703 driven by a motor M in view of maintaining the uniformity of the concentration in the container 701. The sample in the container 701 is periodically measured by the densitometer C through the line 702 by the pump P.

(Embodiment 2)
FIG. 3 is a functional block diagram showing the configuration of the ballast water control system in the second embodiment of the present invention. The second embodiment relates to a ballast water control system that can be applied to a ballast water treatment system as shown in FIG. That is, the ballast water control system 300 in FIG. 3 includes a measurement unit 301 including an attenuation measurement unit 102, a recording unit 302 that records decay rate data of sodium hypochlorite measured by the measurement unit 301, and a recording unit 302. Based on the decay rate data, a controller 303 is provided for determining an increase or decrease in the amount of sodium hypochlorite supplied from the chemical solution supply apparatus 101 and controlling the amount of sodium hypochlorite supplied to the ballast water supply line 107. Note that the ballast water control system 300 of FIG. 3 may be included as a component in the ballast water treatment system of the first embodiment shown in FIG.

  The measurement unit 301 may be configured as shown in the measurement unit 401 in FIG. That is, the measurement unit 401 includes a flow meter (FM) and a sodium hypochlorite concentration meter (C) disposed in the ballast water supply line 107 in addition to the attenuation measurement unit 102, and the storage tank 211 of the chemical solution supply apparatus 101. A sodium hypochlorite concentration meter may be included. Such information can be recorded in the recording unit 302.

  The recording unit 302 can record data as shown in the recording unit 402 of FIG. That is, the decay rate data measured by the measurement unit 401, the flow rate and sodium hypochlorite concentration of the ballast water, and the sodium hypochlorite concentration of the storage tank are included, and the elapsed time from the start of ballast water injection As well as navigation data (preferably including at least the time to drain). The recording unit 402 can also record a sodium hypochlorite concentration range to be maintained in the ballast tank.

  The control unit 303 can be configured as shown in the control unit 403 of FIG. That is, the analysis unit 411 that predicts the sodium hypochlorite concentration in the ballast tank 103 when the ballast water injection is completed, when a predetermined time has elapsed, and / or when the ballast water is discharged from the data recorded in the recording unit 402, and the analysis unit A supply amount control unit 412 that determines increase / decrease in the amount of sodium hypochlorite supplied from the chemical solution supply apparatus 101 based on the result of 411 and controls the amount of sodium hypochlorite supplied to the ballast water supply line 107. May be included.

  An example of the ballast water control method and ballast water injection method of the present invention will be described with reference to FIG. As shown in FIG. 5, first, the ballast pump 106 is started (S501). As a result, liquid intake is started through the sea chest 104. In addition, when the chemical solution supply apparatus 101 is an apparatus using electrolysis, generation of sodium hypochlorite is started (S502). When the ballast pump 106 is started (S501), the liquid taken into the ballast water supply line 107 is sent to the ballast tank 103 (S503). A flow rate of ballast water, a water injection disclosure time, an integrated water injection amount, a hypochlorous acid concentration, and the like are measured by a flow meter (FM) and a concentration meter (C) arranged in the ballast water supply line 107. Such information can be stored in the recording unit 402. When water injection into the ballast water supply line 107 is started, an initial set amount of sodium hypochlorite aqueous solution is supplied to the ballast water supply line 107 through the line 109 from the chemical solution supply apparatus 101 (S504). The initial set amount includes the concentration range of sodium hypochlorite in the ballast water in the ballast tank 103 after water injection, the concentration of the sodium hypochlorite aqueous solution stored in the chemical solution supply apparatus 101 (or the storage tank 211), and It can be set in advance based on attenuation data of sodium hypochlorite obtained in advance. The initial set amount can be stored in the recording unit 402, and based on this information, the supply amount control unit 412 of the control unit 403 may control the supply amount. It should be noted that the initial set amount should be set so that it is less than the predetermined concentration that can be discharged when the ship arrives at the destination and discharges the ballast water (time tx in FIG. 6). It is preferable from the point.

  Next, the ballast water supplied with sodium hypochlorite is sampled from the line 111 and the concentration measurement of sodium hypochlorite is repeatedly performed in the attenuation measurement unit 102 to obtain attenuation data (S505). Sampling can be performed, for example, within 0 to 1 hour after the start of ballast water injection, and the concentration measurement of sodium hypochlorite in the attenuation measurement unit 102 is performed within a range of, for example, 1 to 10 times every 30 minutes to 1 hour. Can be measured. The attenuation data of the water taken in this way is stored in the recording unit 402. During the measurement of the attenuation data in the attenuation measurement unit 102, the ballast water injection can be continued without stopping. The analysis unit 411 of the control unit 403 accesses the recording unit 402 and determines whether or not the amount of sodium hypochlorite currently supplied is appropriate (S506). Note that the analysis unit 411 can access the recording unit 402 as needed to make a determination when the attenuation curve of the taken-in liquid can be predicted. If the sodium hypochlorite concentration is too high, it will cause damage and deterioration of the piping (line) and ballast tank, and a reducing agent and leaving time will be required during discharge. On the other hand, when the sodium hypochlorite concentration is too low, the sterilization treatment of aquatic microorganisms becomes insufficient. When it is determined that the supply amount of sodium hypochlorite needs to be corrected, the supply amount control unit 412 of the control unit 403 corrects the amount supplied from the chemical solution supply apparatus 101 (or the storage tank 211) (S507). On the other hand, when correction of the supply amount of sodium hypochlorite is not necessary, the water injection of ballast water is continued (S508). Sampling and generation of attenuation data may be performed once or multiple times. Further, the number of determinations as to whether or not the sodium hypochlorite supply amount needs to be corrected based on the attenuation data (S506) may be one or more. These can be determined according to the time required for pouring the ballast water and the total amount of ballast water to be poured (S509). Finally, the ballast water is poured to the target volume (S510), and the ballast water injection is completed.

(Embodiment 3)
FIG. 8 is a schematic configuration diagram showing the configuration of the ballast water treatment system according to Embodiment 3 of the present invention. In FIG. 8, the same components as those in FIG.

  In the third embodiment, the chemical liquid supply device 801 is connected to a second water intake 804 different from the water intake 104 to which the ballast water supply line 107 is connected. That is, the chemical liquid supply device 801 of the third embodiment is not connected to a line that can take in the liquid taken from the water intake (sea chest) 104 that takes in the ballast water, and is connected to the second via the line 810. The configuration is the same as that of the ballast water treatment system of the first embodiment except that it is connected to the water intake 804. As described above, according to the ballast water treatment system in the third embodiment, the liquid (sodium hypochlorite aqueous solution) taken from the water intake (sea chest) 104 for taking in the ballast water is added in the chemical supply device 801. The sodium hypochlorite is generated using the liquid taken from the second water intake 804 instead of the liquid taken before the water is taken, for example, compared with the water intake 104 taking water from the ballast water. In addition, the liquid can be taken in easily with low power. For this reason, by taking in a liquid for generating sodium hypochlorite from the outside during navigation, sodium hypochlorite can be generated in the chemical solution supply device 801 during navigation. Power consumption when storing in the ballast tank 103 can be reduced. In addition, it becomes easy to supply the sodium hypochlorite aqueous solution to the ballast tank 103 during navigation, and re-growth of aquatic microorganisms in the ballast tank 103 can be suppressed. The line 810 may include, for example, a pump 806 for sending the liquid taken in from the second water intake 804 to the chemical liquid supply device 801. Further, the line 810 may include a strainer 805 for protecting the chemical solution supply device 801.

  Therefore, the present invention provides, as yet another aspect, a ballast water supply line that connects a water intake port and a ballast tank, and a sterilization treatment of aquatic microorganisms in the liquid that is connected to the line and taken from the water intake port. A chemical supply device that supplies the sodium hypochlorite aqueous solution to the line, and the chemical supply device is connected to a second intake port that is different from the intake port to which the ballast water supply line is connected. The present invention relates to a ballast water treatment system (hereinafter, also referred to as “second ballast water treatment system of the present invention”) that generates sodium hypochlorite by electrolyzing a liquid taken from two water intakes. In the second ballast water treatment system of the present invention, the sodium hypochlorite is easily and low-powered by performing water intake in the chemical solution supply apparatus from a water intake different from the water intake (sea chest) for taking ballast water. Based on the knowledge that can be generated. In addition, the second ballast water treatment system of the present invention has a water intake and discharge of ballast water and a cargo loading / unloading operation while the ship is anchored at the port. Based on the knowledge that by taking in the liquid used to generate sodium hypochlorite and generating sodium hypochlorite, the peak of power consumption can be dispersed and the capacity of the generator mounted on the ship can be reduced.

  According to the second ballast water treatment system of the present invention, for example, the chemical supply device is connected to the second intake port that is different from the intake port to which the ballast water supply line is connected. The liquid used for generation | occurrence | production has the effect that water can be taken in easily. Therefore, according to the second ballast water treatment system of the present invention, water can be taken without driving the sea chest. For example, the liquid used for generating sodium hypochlorite can be easily used even during navigation. The water can be taken in, and the water can be taken with low power.

  In the present specification, the “second intake port different from the intake port to which the ballast water supply line is connected” refers to something other than an intake port (for example, a sea chest) for taking in liquid to be stored in the ballast tank. Thus, for example, a water intake for drinking water or the like existing in a ship can be mentioned.

  The second ballast water treatment system of the present invention may include a controller that controls the amount of sodium hypochlorite supplied from the chemical solution supply device to the ballast water supply line. Based on the amount of sodium hypochlorite in the chemical solution supply device and / or the concentration of sodium hypochlorite in the ballast tank, the control unit in this aspect is configured to take in liquid from the second water intake and sodium hypochlorite. It is preferable to control the generation.

  The present invention provides, as still another aspect, a ballast water supply line that connects a water intake and a ballast tank, and a sterilization treatment for aquatic microorganisms in a liquid that is connected to the line and taken from the water intake. A method for treating ballast water in a ship equipped with a chemical solution supply device for supplying a sodium chlorite aqueous solution to the line, wherein the chemical solution supply device is different from a water intake port connected to the ballast water supply line. A ballast comprising: electrolyzing a liquid taken from the water intake 2 to generate sodium hypochlorite; and supplying the sodium hypochlorite from the chemical liquid supply device to the ballast water supply line The present invention relates to a water treatment method.

  It is preferable that the electrolysis process in the chemical solution supply apparatus is performed during navigation. Thereby, the power consumption at the time of pouring ballast water into a ballast tank can be reduced. Moreover, since sodium hypochlorite is generated and stored during navigation, sodium hypochlorite can be supplied from the start of ballast water injection, thus preventing time loss.

  The present invention provides, as still another aspect, a ballast water supply line that connects a water intake and a ballast tank, and a sterilization treatment for aquatic microorganisms in a liquid that is connected to the line and taken from the water intake. In a ship equipped with a chemical solution supply device for supplying a sodium chlorite aqueous solution to the line, a method for producing sodium hypochlorite for sterilizing aquatic microorganisms in ballast water, the chemical solution supply device, The present invention relates to a production method including electrolyzing a liquid taken from a second water intake different from a water intake connected to the ballast water supply line to generate sodium hypochlorite. According to the production method of the present invention, for example, the chemical supply device can easily take in the liquid used for generating sodium hypochlorite from the second intake different from the intake connected to the ballast water supply line. There is an effect that sodium hypochlorite can be easily generated.

  The electrolysis of the liquid is preferably performed during navigation. Thereby, the power consumption at the time of ballast water injection can be reduced.

(Embodiment 4)
FIG. 9 is a schematic configuration diagram illustrating a configuration of a ballast water treatment system according to Embodiment 4 of the present invention. In FIG. 9, the same components as those in FIG.

  The ballast water treatment system of the fourth embodiment is the ballast water treatment system of the third embodiment except that the attenuation measurement unit 102 and the line 111 for sampling from the ballast water supply line 107 to the attenuation measurement unit 102 are not provided. It is the same composition as.

  An example of the ballast water treatment method using the ballast water treatment system of the fourth embodiment will be described.

  During navigation, before taking ballast water and / or during ballast water intake, the liquid used for generating sodium hypochlorite is taken from the outside of the ship through the second intake 804 through the line 810, and sodium hypochlorite is generated by electrolysis. Let According to the ballast water treatment system of the fourth embodiment, the line 810 for taking in liquid used for generating sodium hypochlorite is connected to the second water intake 804 different from the ballast water intake 104. Therefore, the liquid can be taken in without driving the ballast pump 106. Ships also have cargo loading and unloading work while berthing at the time of ballast water storage, etc., and since they use the most electricity, they disperse peaks in power consumption and reduce generator capacity. During navigation, it is preferable that the liquid used for generating sodium hypochlorite is taken in and sodium hypochlorite is generated and stored.

  In order to take in the ballast water, the ballast pump 106 is started. As a result, liquid intake is started through the sea chest 104, and water injection into the ballast tank 103 is started through the ballast water supply line 107. When water injection into the ballast water supply line 107 is started, the sodium hypochlorite aqueous solution stored in the chemical liquid supply device 801 is supplied to the ballast water supply line 107 through the line 109. According to the ballast water treatment system of the fourth embodiment, since it is possible to store sodium hypochlorite that has been generated in advance before the ballast water intake, water injection into the ballast tank 103 is started. At the same time, the sodium hypochlorite aqueous solution can be supplied to the ballast water supply line 107.

  The supply amount of the sodium hypochlorite aqueous solution is determined in advance based on the amount of ballast water injected into the ballast tank 103, the concentration of the sodium hypochlorite aqueous solution stored in the chemical solution supply device 801 (or the storage tank 211), and the like. it can. In addition, based on the measured values of the flow meter (FM) and the sodium hypochlorite concentration meter (C) arranged in the ballast water supply line 107, the supply amount of the sodium hypochlorite aqueous solution in the control unit (not shown) May be controlled.

  The present invention is useful in the treatment of ballast water in a ship.

101 Chemical solution supply device 102 Attenuation measurement unit 103 Ballast tank 104 Sea chest (water intake)
105 Strainer 106 Ballast Pump 107 Ballast Water Supply Line 108, 109, 110, 111 Line 201 Chemical Solution Supply Device 211 Storage Tank 212 Electrolyzer 213, 214 Line 300 Ballast Water Control System 701 Container 702 Concentration Measurement Line 703 Stirrer 704 Drain 801 Chemical solution supply device 804 Second water inlet 805 Strainer 806 Pump 810 Line

Claims (13)

A ballast water supply line for supplying the liquid taken from the water intake to the ballast tank, and a chemical liquid supply device for supplying the line with a sodium hypochlorite aqueous solution for sterilizing aquatic microorganisms in the liquid In the ballast water treatment system provided,
The liquid in the line to which a predetermined amount of sodium hypochlorite is supplied from the chemical supply device is sampled, the decay of the sodium hypochlorite concentration in the sampled sample is measured, and the chemical is based on the measurement data The control method of ballast water including adjusting the supply amount of sodium hypochlorite supplied to the said line from a supply apparatus. The adjustment of the supply amount is based on sodium hypochlorite decay measurement data in the drawn-in liquid, hypochlorous acid in the ballast tank when the ballast water injection is completed, when a predetermined time has elapsed, or when the ballast water is discharged Predicting the sodium concentration, determining an increase or decrease in the amount of sodium hypochlorite supplied from the chemical supply device to the ballast water supply line based on the prediction, and supplying the line based on the determination The control method of the ballast water of Claim 1 including controlling the amount of sodium hypochlorites performed. The ballast water control method according to claim 1 or 2, wherein the sampling and attenuation measurement are performed by an attenuation measurement unit including a concentration meter of sodium hypochlorite. A method for injecting ballast water, comprising performing control by the control method according to claim 1. A ballast water supply line connecting the intake port and the ballast tank;
A chemical supply apparatus connected to the line and supplying a sodium hypochlorite aqueous solution to the line for sterilizing aquatic microorganisms in the liquid taken from the water intake;
An attenuation measurement unit that is disposed between a connection point between the line and the chemical solution supply device, and a ballast tank, and measures the sodium hypochlorite concentration by sampling the liquid in the line;
A recording unit for recording data measured by the attenuation measurement unit;
A controller for controlling the amount of sodium hypochlorite supplied to the line from the chemical supply device through the connection point in the ballast water injection water;
The control unit predicts the sodium hypochlorite concentration in the ballast tank when the ballast water injection is completed, the predetermined time has elapsed, or the ballast water is discharged based on the decay rate data of sodium hypochlorite, A ballast water treatment system comprising determining an increase or decrease in the amount of sodium hypochlorite supplied from a supply device and controlling the amount of sodium hypochlorite supplied to the line. The control unit further includes at least an integrated water injection amount of ballast water, an integrated supply amount of sodium hypochlorite, navigation data, and a predetermined sodium hypochlorite concentration to be maintained in the ballast tank before the control. The ballast water treatment system according to claim 5, wherein the prediction and / or the determination is performed based on one. The chemical solution supply device is connected to a second intake port that is different from the intake port to which the ballast water supply line is connected, and generates sodium hypochlorite using the liquid taken from the second intake port. The ballast water treatment system according to claim 5 or 6. A ship provided with the ballast water treatment system according to any one of claims 5 to 7. A ballast water supply line connecting the intake port and the ballast tank;
A chemical supply device connected to the line and supplying a sodium hypochlorite aqueous solution to the line for sterilizing aquatic microorganisms in the liquid taken from the water intake,
The chemical liquid supply device is connected to a second water intake port that is different from the water intake port connected to the ballast water supply line, and electrolyzes the liquid taken from the second water intake port to obtain sodium hypochlorite. Generates a ballast water treatment system. A control unit that controls the amount of sodium hypochlorite supplied from the chemical solution supply device to the line; and the control unit includes the amount of sodium hypochlorite in the chemical solution supply device and / or the next amount in the ballast tank. The ballast water treatment system according to claim 9, comprising controlling liquid water intake from the second water intake and generation of sodium hypochlorite based on a sodium chlorite concentration. A ballast water supply line connecting the intake port and the ballast tank, and an aqueous sodium hypochlorite solution for sterilizing aquatic microorganisms in the liquid taken from the intake port connected to the line and supplied to the line In a ship equipped with a chemical solution supply device, a method for treating ballast water,
In the chemical liquid supply device, electrolyzing a liquid taken from a second water intake different from the water intake connected to the ballast water supply line to generate sodium hypochlorite; and
A method for treating ballast water, comprising supplying the sodium hypochlorite from the chemical solution supply device to the ballast water supply line. The ballast water treatment method according to claim 11, wherein the electrolysis treatment in the chemical solution supply apparatus is performed during navigation. A ballast water supply line connecting the intake port and the ballast tank, and an aqueous sodium hypochlorite solution for sterilizing aquatic microorganisms in the liquid taken from the intake port connected to the line and supplied to the line A method for producing sodium hypochlorite for sterilizing aquatic microorganisms in ballast water in a ship equipped with a chemical solution supply device,
The said chemical | medical solution supply apparatus WHEREIN: The manufacturing method including electrolyzing the liquid taken in from the 2nd water intake different from the water intake connected to the said ballast water supply line, and generating sodium hypochlorite.

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