JP6720912B2 - Ship and ballast water treatment method - Google Patents

Description

The present invention relates to a ship equipped with a ballast water treatment device for sterilizing ballast water stored in a ballast tank of a ship by using an aqueous solution of a chlorine-based chemical as a sterilizer, and more specifically, the sterilizer The present invention relates to a ship having a function of preventing problems due to residues. Further, the present invention relates to a ballast water treatment method of sterilizing ballast water stored in a ballast tank of a ship by using an aqueous solution of a chlorine-based chemical as a sterilizing agent, and more specifically, a problem due to residues of the sterilizing agent. The present invention relates to a ballast water treatment method having a step of preventing the above.

A typical example of ballast water treatment for sterilizing ballast water of a ship with a disinfectant is to filter the ballast water taken from the outside of the ship, and then inject a disinfectant containing an oxidizing substance into the filtered ballast water to disinfect it. A sterilizing process in which the ballast water after injection is stored in or watered in a ballast tank, and a reducing agent containing a reducing substance is injected into the ballast water that has been injected from the ballast tank and has been injected with the bactericide, and the ballast water after injection of the reducing agent. Can be roughly divided into a reduction process in which the water is drained outside the ship. As the sterilization treatment, it is known to use an aqueous solution of a chlorine-based chemical containing oxidizable free available chlorine as a sterilizer (Patent Documents 1 to 3). The aqueous solution of the chlorine-based drug can be prepared by dissolving the solid chlorine-based drug in water (Patent Documents 4 and 5).

JP2011-092899A JP, 2013-075250, A JP2011-092898A JP, 2013-056296, A International publication 2014/007171

When an aqueous solution of a chlorine-based agent is prepared and the ballast water to be stored in the ballast tank is sterilized using the aqueous solution, the aqueous solution is usually added in an amount larger than the amount originally required to sterilize the ballast water. prepare. Because, in order to inject the aqueous solution of the chlorine-based drug into the ballast water as a sterilizing agent, at least a pipe for circulating the aqueous solution to the ballast water is necessary, and the amount to be originally used for sterilizing the ballast water is required. In addition, an extra amount of the aqueous solution that spreads in the pipe is required.

However, if an aqueous solution of a chlorine-based chemical is prepared in a larger amount than the originally required amount, an excess of the aqueous solution is not used for ballast water treatment, and the chlorine-based chemical is dissolved in the pipe and the chlorine-based chemical in water. The aqueous solution of is generated as a chlorine-based germicide and remains in the germicide supply device that supplies the ballast water.

An aqueous solution of a chlorine-based chemical that remains without being used for ballast water treatment and/or a component of the chlorine-based chemical (hereinafter collectively or individually referred to as a "bactericide residue") is in a pipe and a germicide supply device. If the concentration of chlorine-based chemicals in water decreases due to evaporation of water, or if the water temperature of the disinfectant residue decreases, the precipitates of the chlorine-based chemical component become disinfectant residue. There is a possibility that the precipitates may be generated and accumulated in the inside or in the liquid contact area between the disinfectant residue and the pipe, and in some cases, the precipitate may be solidified in the pipe and in the disinfectant supply device. The fear becomes particularly great when the raw material of the chlorine-based germicide is a solid chlorine-based chemical. This is because if the raw material is solid, the decrease in the solubility of the raw material in water is directly linked to the generation of precipitates of the components of the raw material.

The generation/accumulation/solidification of the above-mentioned deposits is a problem such as a blockage of the pipe, an increase in pressure loss and other distribution obstacles, a malfunction of equipment such as a mixer, a sensor, a valve and a pump provided in the pipe and the disinfectant supply device (hereinafter , Collectively referred to as “operation failure” due to the disinfectant residue), which in turn impedes the normal execution of ballast water treatment.

Depending on the location where the ballast water treatment equipment is installed on the ship, the destination of the ship, the route, the navigation time, etc., the concentration of at least part of the disinfectant residue progresses, and due to the decrease in the water temperature of the disinfectant residue, chlorine-based chemicals for water Solubility decreases. For example, if the function of air conditioning and ventilation in the engine room of a ship traveling just below the equator is insufficient, the temperature of the engine room may be close to 50°C (in some cases, above 50°C). In the ballast water treatment device installed in the engine room, the concentration of at least a part of the germicide residue progresses in a short time due to significant evaporation of water. In addition, even if the evaporation of water progresses slowly, the ballast water treatment device which repeatedly stores ballast water in the ballast tank as ballast water and drains the ballast water from the ballast tank to the outside of the ship is the first time. When the inactive state is left for a long time from the operation to the second operation, the concentration of the disinfectant residue surely progresses even if it is little by little. On the other hand, if the function of air conditioning and ventilation in the engine room of a ship traveling in low-temperature mid- and high-latitude areas is insufficient, the engine room temperature will drop below 30°C, so ballast water treatment installed in such engine room. In the device, the solubility of the chlorine-based drug in water decreases as the water temperature of the germicide residue decreases.

When the concentration of at least a part of the disinfectant residue or the decrease in the solubility of the chlorine-based drug in water progresses, the precipitate of the component of the chlorine-based drug is generated in the disinfectant residue or in the disinfectant residue and the ballast water treatment. It is generated in the area that comes into contact with the components of the equipment (container, piping system, etc.), accumulates, and in some cases solidifies, causing malfunctions due to the disinfectant residue, which may prevent normal operation of ballast water treatment. It becomes an obstacle.

Some chlorine-based chemicals generate chlorine-containing gas from an aqueous solution of the chlorine-based chemical. For example, in the case of sodium dichloroisocyanurate, a chlorine-containing gas is generated from its aqueous solution. Even a small amount of chlorine-containing gas is often accompanied by an irritating odor, which deteriorates the working environment onboard the ship around the source of chlorine-containing gas.

The present invention has been made in view of such circumstances, and suppresses or prevents the occurrence of a factor that inhibits the normal execution of ballast water treatment using an aqueous solution obtained by dissolving a chlorine-based drug in water as a bactericide. An object of the present invention is to provide a ship equipped with a ballast water treatment device and a ballast water treatment method.

According to the present invention, the above-mentioned problems are solved by the following first to ninth inventions regarding the following ships and the tenth invention through the eighteenth inventions regarding the ballast water treatment method.

[Vessel]
<First invention>
A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and a ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
The ballast water treatment device, when in the ballast water flooding operation mode, a sterilizer supply device including a sterilizer supply pipe for supplying a chlorine-based sterilizer to the ballast water flowing toward the ballast tank, and a ballast water pipe. A reducing agent supply device having a reducing agent supply pipe for supplying a reducing agent to the ballast water flowing inside, and a residue of the chlorine-based disinfectant remaining in the disinfectant supply device after the end of the ballast water flooding operation mode. And a residue injection pipe communicating the sterilizing agent supply pipe with the reducing agent supply pipe so as to inject at least a part of the above into the reducing agent supply pipe of the reducing agent supply device.

<Second invention>
A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and a ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
The ballast water treatment device, when in the ballast water flooding operation mode, a sterilizer supply device including a sterilizer supply pipe for supplying a chlorine-based sterilizer to the ballast water flowing toward the ballast tank, and a ballast water pipe. A reducing agent supply device having a reducing agent supply pipe for supplying a reducing agent to the ballast water flowing inside, and a residue injection pipe for communicating the sterilizing agent supply pipe with the reducing agent supply pipe,
The disinfectant supply device injects at least a part of the residue of the chlorine-based disinfectant remaining in the disinfectant supply device after the end of the ballast water flooding operation mode into the reducing agent supply pipe through the residue injection pipe. ,
The reducing agent supply device is configured such that at least a part of the residue of the chlorine-based bactericide remaining in the sterilizer supply device after the end of the ballast water flooding operation mode is injected into the reducing agent supply pipe through the residue injection pipe. The ship is characterized in that the reducing agent is supplied to the reducing agent supply pipe at the time of operation, and the reducing agent is supplied to the ballast water that is taken from the ballast tank and discharged to the outside of the vessel in the ballast water drainage operation mode.

<Third invention>
A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and a ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
The ballast water treatment device, when in the ballast water flooding operation mode, a sterilizer supply device including a sterilizer supply pipe for supplying a chlorine-based sterilizer to the ballast water flowing toward the ballast tank, and a ballast water pipe. A reducing agent supply pipe having a reducing agent supply pipe for supplying a reducing agent to the ballast water flowing therein, and a mixing tank provided in the reducing agent supply pipe for accommodating the reducing agent; and ending the ballast water flooding operation mode. A residue injection pipe for communicating the sterilizing agent supply pipe to the mixing tank so that at least a part of the residue of the chlorine-based sterilizing agent remaining in the sterilizing agent supply device later is injected into the mixing tank of the reducing agent supplying device. A ship comprising:.

<Fourth invention>
A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and a ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
The ballast water treatment device, when in the ballast water flooding operation mode, a sterilizer supply device including a sterilizer supply pipe for supplying a chlorine-based sterilizer to the ballast water flowing toward the ballast tank, and a ballast water pipe. A reducing agent supply pipe having a reducing agent supply pipe for supplying the reducing agent to the ballast water flowing therein and a mixing tank provided in the reducing agent supply pipe for accommodating the reducing agent, and the disinfectant supply pipe communicating with the mixing tank. With a residue injection pipe to
The disinfectant supply device injects at least a part of the residue of the chlorine-based disinfectant remaining in the disinfectant supply device after the end of the ballast water flooding operation mode into the mixing tank via the residue injection pipe,
The reducing agent supply device, when at least a part of the residue of the chlorine-based bactericide remaining in the bactericide supply device after the end of the ballast water flooding operation mode is injected into the mixing tank through the residue injection pipe, A vessel characterized by containing a reducing agent in a mixing tank and supplying the reducing agent to the ballast water taken from the ballast tank and discharged to the outside of the vessel in the ballast water drainage operation mode.

<Fifth Invention>
In the first invention or the second invention, a confluent point between the residue injection pipe and the reducing agent supply pipe, and a pipe between the ballast water pipes receive a mixed liquid of the residue of the sterilizing agent and the reducing agent, and the reducing agent. The precipitate that is produced from the chlorine-based bactericide and precipitates as a solid by the reaction of is dispersed in the mixture in the form of fine particles, the dispersion that is not dispersed, and the precipitate that has not yet reacted with the reducing agent. A separation device that separates into an undispersed liquid containing the residue of the chlorine-based bactericide is provided, the undispersed liquid is returned to the inlet side of the separation device, and the dispersion liquid is supplied to the ballast water piping. To be a ship.

<Sixth invention>
In the first invention or the second invention, further, at the confluence of the residue injection pipe and the reducing agent supply pipe, the residue of the chlorine-based bactericide injected into the reducing agent supply pipe becomes a reducing agent in the reducing agent supply pipe. An oxidation-reduction potentiometer for measuring the oxidation-reduction potential of the mixed liquid produced by merging is provided at a position downstream from the merging point, which is the ballast water pipe side, and of the mixed liquid measured by the oxidation-reduction potentiometer. Control for controlling at least one of the flow rate of the chlorine-based bactericide residue supplied to the residue injection pipe and the reducing agent supply amount supplied from the reducing agent supply source to the reducing agent supply pipe based on the redox potential measurement value. A ship equipped with a device.

<Seventh invention>
In the first invention or the second invention, further, at the confluence of the residue injection pipe and the reducing agent supply pipe, the residue of the chlorine-based bactericide injected into the reducing agent supply pipe becomes a reducing agent in the reducing agent supply pipe. A pH meter for measuring the pH of the mixed solution produced by merging is provided at a position on the downstream side, which is the ballast water piping side from the merging point, based on the pH measurement value of the mixed solution measured by the pH meter, A vessel provided with a control device for controlling at least one of a flow rate of a residue of a chlorine-based germicide supplied to a residue injection pipe and a reducing agent supply amount supplied from a reducing agent supply source to a reducing agent supply pipe.

<Eighth invention>
3rd or 4th invention WHEREIN: Furthermore, the reducing agent supply apparatus is an oxidation-reduction potentiometer which measures the oxidation-reduction potential of the mixed liquid produced|generated when the residue of a chlorine-based germicide reacts with the reducing agent in a mixing tank. Is provided at a position downstream of the mixing tank or the ballast water pipe side from the mixing tank, based on the oxidation-reduction potential measurement value of the mixed solution measured by the oxidation-reduction potentiometer, based on the chlorine-based germicide supplied to the mixing tank. A ship provided with a control device for controlling at least one of a flow rate of a residue and a reducing agent supply amount supplied from a reducing agent supply source to a mixing tank.

<Ninth Invention>
In the third or fourth invention, the reducing agent supply device further comprises a pH meter for measuring the pH of a mixed liquid produced by the residue of the chlorine-based bactericide reacting with the reducing agent in the mixing tank. Provided at a position downstream of the mixing tank on the ballast water pipe side, and based on the pH measurement value of the mixed solution measured by the pH meter, the flow rate of the chlorine-based germicide residue supplied to the mixing tank and the reducing agent supply. A ship provided with a control device for controlling at least one of the reducing agent supply amounts supplied from the source to the mixing tank.

[Ballast water treatment method]
<Tenth Invention>
A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ballast water treatment method on a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and ballast water taken from the ballast tank is shipped. It is possible to switch to ballast water drainage operation mode that drains outside,
The reducing agent can be supplied from the reducing agent supply device to the ballast water flowing in the ballast water pipe through the reducing agent supply pipe,
When in the ballast water flooding operation mode, the chlorine-based germicide is supplied from the germicide supply device to the ballast water flowing toward the ballast tank through the germicide supply pipe, and after the ballast water flooding operation mode ends. At least a part of the residue of the chlorine-based disinfectant remaining in the disinfectant supply device is passed through a residue injection pipe that connects the disinfectant supply pipe to the reductant supply pipe, and the reducing agent supply pipe of the reducing agent supply device. A method for treating ballast water, which comprises injecting into ballast water.

<Eleventh Invention>
A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ballast water treatment method on a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside of the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
The reducing agent can be supplied from the reducing agent supply device to the ballast water flowing in the ballast water pipe through the reducing agent supply pipe,
In the ballast water flooding operation mode, the chlorine-based germicide is supplied to the ballast water flowing toward the ballast tank from the germicide supply device through the germicide supply pipe,
At least a part of the residue of the chlorine-based disinfectant remaining in the disinfectant supply device after the end of the ballast water flooding operation mode, via a residue injection pipe that connects the disinfectant supply pipe to the reducing agent supply pipe. Inject into the reducing agent supply pipe,
When at least a part of the residue of the chlorine-based germicide remaining in the germicide supply device after the end of the ballast water flooding operation mode is injected into the reducing agent supply pipe through the residue injection pipe, the reducing agent supply pipe And a reducing agent is supplied to the ballast water which is taken from the ballast tank and discharged to the outside of the ship in the ballast water drainage operation mode.

<Twelfth Invention>
A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ballast water treatment method on a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
In the ballast water flooding operation mode, the chlorine-based germicide is supplied to the ballast water flowing toward the ballast tank from the germicide supply device through the germicide supply pipe,
After the completion of the ballast water flooding operation mode, the disinfectant is supplied to the mixing tank that stores the reducing agent provided in the reducing agent supply pipe that supplies the reducing agent from the reducing agent supply device to the ballast water flowing in the ballast water pipe. A ballast water treatment method, characterized in that at least a part of the residue of the chlorine-based bactericide remaining in the apparatus is injected through a residue injection pipe that connects the bactericide supply pipe to the mixing tank.

<Thirteenth invention>
A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ballast water treatment method on a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside of the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
In the ballast water flooding operation mode, the chlorine-based germicide is supplied to the ballast water flowing toward the ballast tank from the germicide supply device through the germicide supply pipe,
After the completion of the ballast water flooding operation mode, the disinfectant is supplied to the mixing tank that stores the reducing agent provided in the reducing agent supply pipe that supplies the reducing agent from the reducing agent supply device to the ballast water flowing in the ballast water pipe. At least a part of the residue of the chlorine-based bactericide remaining in the apparatus is injected through a residue injection pipe that connects the bactericide supply pipe to the mixing tank,
When at least a part of the residue of the chlorine-based bactericide remaining in the bactericide supply device after the end of the ballast water flooding operation mode is injected into the mixing tank through the residue injection pipe, a reducing agent is added to the mixing tank. A ballast water treatment method, which is characterized in that a reducing agent is supplied to the ballast water taken from the ballast tank and discharged to the outside of the ship when the ballast water is stored and in the ballast water drainage operation mode.

<Fourteenth invention>
In the tenth invention or the eleventh invention, a mixture of the residue of the disinfectant and the reducing agent is separated by a separating device provided in a pipe between the confluence of the residue injection pipe and the reducing agent supply pipe and the ballast water pipe. Received, a dispersion liquid in which precipitates generated from a chlorine-based bactericide by reaction with a reducing agent and precipitated as a solid matter are dispersed in a mixed solution in the form of fine particles, and a precipitate that is not dispersed and a reducing agent. Ballast water to be separated into undispersed liquid containing residual chlorine-based bactericide which has not yet reacted, the undispersed liquid being returned to the inlet side of the above separating device, and the dispersion being supplied to the ballast water pipe. Processing method.

<Fifteenth Invention>
In the tenth or eleventh invention, further, at the confluence point of the residue injection pipe and the reducing agent supply pipe, the residue of the chlorine-based bactericide injected into the reducing agent supply pipe becomes a reducing agent in the reducing agent supply pipe. The redox potential of the mixed solution produced by merging is measured by a redox potential meter provided at a position downstream of the confluence point which is the ballast water piping side, based on the redox potential measurement value of the mixed solution. , Ballast water for which at least one of the flow rate of the residue of the chlorine-based germicide supplied to the residue injection pipe and the reducing agent supply amount supplied from the reducing agent supply source to the reducing agent supply pipe is controlled by the control device. Processing method.

<Sixteenth invention>
In the tenth or eleventh invention, further, at the confluence point of the residue injection pipe and the reducing agent supply pipe, the residue of the chlorine-based bactericide injected into the reducing agent supply pipe becomes a reducing agent in the reducing agent supply pipe. The pH of the mixed solution produced by merging is measured by a pH meter provided at a position downstream of the confluence point on the ballast water piping side, and based on the measured pH value of the mixed solution, a residue injection pipe A ballast water treatment method, wherein at least one of the flow rate of the residue of the chlorine-based bactericide supplied to the reducing agent supply amount and the reducing agent supply amount supplied from the reducing agent supply source to the reducing agent supply pipe is controlled by a controller.

<Seventeenth invention>
In the twelfth invention or the thirteenth invention, further, the oxidation-reduction potential of the mixed liquid produced by the residue of the chlorine-based bactericide reacting with the reducing agent in the mixing tank is changed from the mixing tank or the mixing tank to ballast water. The flow rate of the chlorine-based germicide residue supplied to the mixing tank and the reducing agent supply source measured based on the oxidation-reduction potential measurement value of the mixed solution, which was measured by an oxidation-reduction potentiometer provided at the downstream side on the piping side. A method for controlling ballast water, wherein at least one of the reducing agent supply amounts supplied from the reactor to the mixing tank is controlled by a controller.

<Eighteenth invention>
In the twelfth invention or the thirteenth invention, further, the pH of the mixed solution produced by the reaction of the residue of the chlorine-based bactericide with the reducing agent in the mixing tank is set to the mixing tank or the ballast water piping side of the mixing tank. Is measured by a pH meter provided at the downstream position, and based on the measured pH value of the mixed solution, the flow rate of the chlorine-based germicide residue supplied to the mixing tank and the reducing agent supply source are supplied to the mixing tank. A ballast water treatment method in which at least one of the reducing agent supply amounts is controlled by a control device.

<Operating principle according to the present invention>
In the ship and the ballast water treatment method according to the present invention configured as described above, when the ballast water taken from the outside is stored in or poured into the ballast tank, the ballast water is sterilized by the chlorine-based bactericide. .. When the ballast water is discharged out of the ballast tank, the bactericide contained in the ballast water is reduced by the reducing agent. However, when the ballast water is stored in the ballast tank or at the end of watering, the chlorine-based disinfectant is not provided for sterilization of the ballast water, and the chlorine-based disinfectant is supplied to the ballast water in the disinfectant supply device. Will remain as a residue (hereinafter "bactericide residue"). In this state, if the disinfectant residue remains in the disinfectant supply device, the components of the chlorine-based disinfectant will precipitate and the operation failure due to the disinfectant residue will occur due to the occurrence, accumulation and solidification of the precipitate, resulting in ballast It interferes with the normal execution of water treatment. Therefore, in the first, second and tenth and eleventh inventions of the present invention, after the completion of the ballast water flooding operation, the disinfectant residue in the disinfectant supply device is injected into the reducing agent supply pipe to disinfect the disinfectant. By combining the residue and the reducing agent, the chlorine-based bactericidal agent is reduced to prevent the occurrence of operation failure due to the bactericidal agent residue.

In the third, fourth and twelfth and thirteenth inventions, at least a part of the bactericide residue is injected into a mixing tank containing a reducing agent and reduced by the reducing agent in the mixing tank.

In a fifth aspect and a fourteenth aspect of the present invention as a preferred embodiment, a mixed liquid of a disinfectant residue and a reducing agent is produced as a solid by a separation device from a chlorine-based disinfectant by reaction with the reducing agent. Precipitate to be dispersed in the form of fine particles dispersed in the mixture, and the undispersed precipitate, the undispersed liquid containing the residual chlorine-based bactericide that has not yet reacted with the reducing agent. Since the undispersed liquid is separated and returned to the inlet side of the separator, the undispersed liquid is never supplied to the ballast water pipe, and only the dispersed liquid is reliably supplied to the ballast water pipe.

In a sixth invention and a fifteenth invention as preferred embodiments of the present invention, the redox potential of the mixed liquid of the bactericide residue and the reducing agent in the reducing agent supply pipe is measured, and the reduction is performed based on the redox potential measurement value. At least one of the flow rate of the disinfectant residue supplied to the agent supply pipe and the reducing agent supply amount supplied from the reducing agent supply source to the reducing agent supply pipe is controlled. By doing so, the reduction of the germicide residue is performed under the proper supply of the germicide residue and the reducing agent.

Furthermore, in the seventh and sixteenth inventions as preferred embodiments of the present invention, the pH of the mixed solution of the disinfectant residue and the reducing agent in the reducing agent supply pipe is measured, and the reduction is performed based on the measured pH value. It is preferable to control at least one of the flow rate of the disinfectant residue supplied to the agent supply pipe and the reducing agent supply amount supplied from the reducing agent supply source to the reducing agent supply pipe. By doing so, the reduction of the germicide residue is performed under the proper supply of the germicide residue and the reducing agent.

Furthermore, in the eighth invention and the seventeenth invention as preferred embodiments of the present invention, the measurement of the oxidation-reduction potential of the mixed liquid of the germicide residue and the reducing agent is on the ballast water pipe side of the mixing tank or the mixing tank. At the downstream position, and in the ninth and eighteenth inventions, the measurement of the pH of the mixed solution of the bactericide residue and the reducing agent is performed on the downstream side of the mixing tank or the ballast water piping side of the mixing tank. Since it is done in-situ, good measurements are made with the germicide residue and reducing agent well mixed. Controlling at least one of the flow rate of the disinfectant residue supplied to the reducing agent supply pipe and the reducing agent supply amount supplied from the reducing agent supply source to the reducing agent supply pipe based on the redox potential measurement value or the pH measurement value. Is preferred. By doing so, the reduction of the germicide residue is performed under the proper supply of the germicide residue and the reducing agent.

In the present invention, the meanings or interpretations of the terms listed below are as follows, unless otherwise explained separately.

(1) "Chlorine drug" means a drug that releases free effective chlorine having a bactericidal action or a substance that can release the free effective chlorine when dissolved in water as a solvent, by disproportionation in an aqueous solution. In the present invention, it may be a “solid” or a “liquid”. “Solid” means a powder, granules, or tablets at room temperature, and in the present invention, the “chlorine drug” does not have to be “solid”.

Typical examples of the "solid chlorine-based drug" are trichloroisocyanuric acid, sodium dichloroisocyanurate and its hydrate, potassium dichloroisocyanurate and the like. The “chlorine-based bactericide” is a drug that sterilizes by utilizing the bactericidal action of free available chlorine, and a typical example thereof is an aqueous solution of a chlorine-based drug.

(2) "Reducing agent" refers to a drug used to receive electrons from other substances regardless of whether it is a solid or not. In relation to a chlorine-based bactericide, a free agent derived from a chlorine-based bactericide is used. It is a substance used to reduce available chlorine. Representative examples of the reducing agent are sodium sulfite or a hydrate thereof, sodium thiosulfate or a hydrate thereof, or an aqueous solution thereof.

According to the present invention, the first to fourth inventions and the tenth to thirteenth inventions are characterized in that at least a part of the disinfectant residue remaining in the disinfectant supply device is injected into the reducing agent supply pipe to remove the disinfectant residue. Since it reacts with a reducing agent to reduce and eliminate free available chlorine, particularly in the third or fourth invention and the twelfth or thirteenth invention, the germicide residue is sufficiently mixed with the reducing agent in the mixing tank. Since it was made to react in the state of sterilization, due to the disinfectant residue, such as blockage of the container and piping path, increased pressure loss and other distribution obstacles, malfunction of the disinfectant supply device and equipment provided in the piping path, etc. It is possible to suppress or prevent the occurrence of a malfunction.

Further, according to the present invention, a chlorine-containing gas is generated from the aqueous solution of the chlorine-based chemical of the disinfectant residue, and even when there is a concern that the chlorine-containing gas may deteriorate the work environment onboard the ship, the reducing agent may be contacted. By doing so, free effective chlorine in an aqueous solution of a chlorine-based chemical (chlorine-based bactericide) is reduced, so that generation of chlorine-containing gas does not occur or is suppressed.

Overall, according to the present invention, it is possible to realize a ship and a ballast water treatment method capable of normally performing ballast water treatment.

It is a basic block diagram which shows one Embodiment of this invention. It is a block diagram of the bactericide dissolution apparatus used for the apparatus of FIG. It is explanatory drawing which shows the ballast water flooding operation mode of the apparatus of FIG. It is explanatory drawing which shows the residue reduction processing operation mode of the apparatus of FIG. It is explanatory drawing which shows the ballast water drainage operation mode of the FIG. 1 apparatus. It is a principal part block diagram shown about the other form of this invention. It is a block diagram shown about other forms of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. At that time, the description will be given with reference to each drawing as necessary, but in each drawing, common portions are denoted by the same reference numerals, and repeated description thereof will be omitted. Of course, the invention is not limited to the illustrated embodiments.

FIG. 1 is a schematic configuration diagram of a ballast water treatment device included in a ship according to the present invention.

1, a ship according to the present invention is provided with an intake or a sea chest 1 for taking ballast water from outside, a ballast tank 2 for accommodating or pouring this ballast water as ballast water, and a ballast from the ballast tank 2. It has a drainage port 3 for taking out water and draining it out of the ship, and the sea chest 1 and the ballast tank 2 are connected by a ballast water pipe 4.

In the ballast water pipe 4, a ballast pump 5 for sending the ballast water taken from the sea chest 1 to the ballast tank 2, a filtering device 6 for filtering and removing foreign matters and plankton in the ballast water, and a ballast water after filtering. A mixer 7 for mixing the ballast water with a sterilizing agent supplied from a sterilizing agent supplying device 20 described later is provided. In the ballast water pipe 4, a first valve V1 is provided between the sea chest 1 and the ballast pump 5, a second valve V2 is provided between the ballast pump 5 and the filtration device 6, and a filtration device 6 and the mixer 7 are provided. The third valve V3 is provided between the mixer 7 and the ballast tank 2, and the opening/closing valves of the fourth valve V4 are provided.

In addition to the ballast water pipe 4, a first drain pipe 8 for discharging ballast water is connected to the ballast tank 2, and the ballast tank 2 and the ballast water pipe 4 are connected to the first valve V1 and the ballast pump 5. It is connected in the position between and. The first drain pipe 8 is provided with a fifth valve V5. Further, a second drain pipe 9 extends from the ballast water pipe 4 at a position immediately upstream of the fourth valve V4 and reaches the drain port 3. The second drain pipe 9 is provided with a sixth valve V6.

Further, the ballast water pipe 4 is provided with a bypass pipe 10 which connects the position between the second valve V2 and the ballast pump 5 and the position between the third valve V3 and the mixer 7 without passing through the filtration device 6. Has been. A seventh valve V7 is provided in the bypass pipe 10.

In the present embodiment, a disinfectant supply device 20 for supplying a disinfectant and a reducing agent supply device 30 for supplying a reducing agent are provided for the ballast water flowing through the ballast water pipe 4.

In the present embodiment, the disinfectant supply device 20 is equipped with a disinfectant dissolution device 21 that dissolves a solid chlorine-based drug in water to generate an aqueous solution as a chlorine-based disinfectant, and is generated by the disinfectant dissolution device 21. The chlorine-based disinfectant is supplied to the ballast water pipe 4 between the filter device 6 and the mixer 7 through the eighth valve V8 by the disinfectant pump 23 provided in the disinfectant supply pipe 22. The ballast water flowing through the ballast water pipe 4 is injected from the inlet 4A.

In addition, the reducing agent supply device 30 includes a reducing agent tank 31 that stores the reducing agent, and a reducing agent pump 33 provided in a reducing agent supply pipe 32 passes through a ninth valve V9 to a position on the inlet side of the mixer 7. Then, the reducing agent is injected into the ballast water flowing in the ballast water pipe 4 from the reducing agent injection port 4B provided in the ballast water pipe 4.

In this embodiment, after filtering the taken-in ballast water and supplying the sterilizing agent to fill the ballast tank 2, the residual chlorine-based sterilizing agent remaining in the sterilizing agent supply device 20 (hereinafter, the sterilizing agent remaining In order to inject the product) into the reducing agent supply pipe 32, the disinfectant supply pipe 22 and the reducing agent supply pipe 32 are positioned between the disinfectant pump 23 and the eighth valve V8, and the reducing agent pump 33 and the ninth valve. It is connected by a residue injection pipe 40 connecting the position between the valves V9. The residue injection pipe 40 and the reducing agent supply pipe 32 form a confluence point J of the flow of the germicide residue and the reducing agent at the connecting position thereof. The residue injection pipe 40 is provided with a tenth valve V10.

Here, the disinfectant residue is an unused chlorine-based disinfectant remaining in the mixing tank 21C (see FIG. 2) and the disinfectant supply pipe 22 included in the disinfectant supply device, and at least one of them. It contains at least one of a substance formed by thickening a part, an aqueous solution formed by mixing water with a chlorine-based chemical that is a raw material of a chlorine-based bactericide, and a mixture. In addition, a mixture obtained by further mixing water with an unused chlorine-based germicide liquid is also included in the germicide residue.

In the present embodiment, there is provided a control device 50 for controlling the flow rate of the sterilizing agent residue from the residue injection pipe 40 or the supply amount of the reducing agent from the reducing agent tank 31 to the reducing agent supply pipe 32. The control device 50 is based on the redox potential measurement value obtained by the redox potential meter 34 provided in the reducing agent supply pipe 32 between the confluence J and the ninth valve V9, and the bactericidal agent of the bactericidal agent is used. The openings of the sterilizing agent pump 23 and the reducing agent pump 33 or the tenth valve V10 are controlled so that at least one of the flow rate of the residue and the reducing agent supply amount can be adjusted.

As shown in FIG. 2, the disinfectant dissolving device 21 of the disinfectant supply device 20 is provided with a hopper 21A for receiving a solid disinfectant and a solid disinfectant in the hopper 21A, which is provided at the lower end of the hopper 21A and cuts out and supplies the disinfectant. A feeder 21B, a mixing tank 21C that receives the cut-out solid sterilizing agent and fresh water to mix them to generate a mixed solution, a pump 21D that sends out the mixed solution, and a sterilizing agent dissolving by receiving the mixed solution. It has a cyclone 21E as a separating device for separating a liquid and a liquid in which the germicide is not dissolved. The cyclone 21E discharges the disinfectant solution from the disinfectant solution outlet 21E-1 and returns the disinfectant undissolved solution from the disinfectant undissolved solution outlet 21E-2 to the pump 21D via the circulation line 21H and again. Join the mixture. A valve 21F is provided at the germicide solution discharge port 21E-1 of the cyclone 21E, and a valve 21G is provided at the fresh water inlet of the mixing tank 21C.

The apparatus of the present embodiment having such a configuration switches the operation mode of the first valve V1 to the ninth valve V9 to any one of the operation modes of the ballast water flooding operation mode, the residue reduction treatment operation mode, and the ballast water drainage mode. Crab is set.

Next, regarding the present embodiment, the operating procedure will be described for each mode, but prior to that, the operation of the bactericide dissolving device 21 in the bactericide supply device 20 will be described.

<Fungicide dissolving device>
In the disinfectant dissolving device 21, first, while supplying fresh water to the mixing tank 21C, the solid chlorine-based chemical in the hopper 21A is cut out by the feeder 21B by a predetermined amount and supplied to the mixing tank 21C to be mixed with the fresh water. Form a mixture. Next, the mixed liquid is sent from the mixing tank 21C to the cyclone 21E by the pump 21D. Thereafter, the cyclone 21E separates the mixed solution into a bactericide solution in which the solid chlorine-based drug is dissolved in water and a bactericide undissolved solution containing the undissolved solid chlorine-based drug, and the bactericide undissolved liquid is circulated. It returns to pump 21D via 21H. Thus, the germicide-undissolved liquid is mixed with the mixed liquid supplied from the mixing tank 21C and sent again to the cyclone 21E as a mixed liquid. The valve V21F is kept closed until the concentration of the disinfectant solution reaches a predetermined concentration, and the disinfectant undissolved solution has a predetermined concentration due to dissolution of undissolved solid chlorine-based chemicals while circulating through the circulation line 21H. Obtain a germicide solution. During the ballast water flooding operation, the disinfectant solution having a predetermined concentration is sent as a disinfectant by the disinfectant pump 23 through the disinfectant supply pipe 22 to the disinfectant inlet 4A, and the ballast water flowing through the ballast water pipe 4 is supplied. Supplied.

In the disinfectant supply device 20, when the supply of the disinfectant to the ballast water is stopped, the disinfectant (solid chlorine is supplied to the mixing tank 21C, the pump 21D, the cyclone 21E, the circulation line 21H, the disinfectant supply pipe 22, and the disinfectant pump 23. Disinfectant residue of (system solution) remains. This bactericide residue contains a chlorine-based bactericide, and if it is not treated at all, problems such as corrosion of the pipe, sticking of deposits due to water evaporation to the pipe, blockage, and generation of chlorine gas will occur. .. How to deal with this problem will be explained in the section of residue reduction treatment operation.

<Ballast water flooding operation>
To fill the ballast tank 2 with ballast water, first, the fifth valve V5 of the first drain pipe 8, the seventh valve V7 of the bypass pipe 10, the ninth valve V9 of the reducing agent supply pipe 32, and the second drain pipe. The sixth valve V6 of 9 is closed, and the first valve V1, the second valve V2, the third valve V3, the fourth valve V4 of the ballast water pipe 4 and the eighth valve V8 of the disinfectant supply pipe 22 are opened. When the valve is opened/closed in this manner, as shown in FIG. 3, among the pipes indicated by the thick line, the pipes indicated by the thick lines are in the flow state, and in the pipes indicated by the other thin lines are in the non-circulation state. Becomes

In this ballast water flooding operation mode, as shown in FIG. 3, in the ballast water pipe 4, the ballast water intake line L1 from the sea chest 1 to the disinfectant inlet 4A and the ballast tank 2 from the disinfectant inlet 4A. Ballast water flooding lines L2 up to are respectively formed.

When the ballast pump 5 is operated under this ballast water flooding operation mode, ballast water is taken from the outside of the ship via the sea chest 1 and flows through the ballast water intake line L1, and the ballast water is supplied to the filtering device 6. Foreign matter and plankton in the ballast water are filtered out. The ballast water after filtration goes to the mixer 7.

Simultaneously with or after the operation of the ballast pump, the disinfectant pump 23 is operated, and the disinfectant is added to the ballast water flowing from the disinfectant inlet 4A through the disinfectant supply pipe 22 to the ballast water filling water line L1 (see FIG. 2). A bactericide solution obtained by dissolving the solid chlorine-based chemical in the bactericide dissolving device 21 shown in 1) is supplied to sterilize the bacteria in the ballast water. The bactericide solution is mixed with the ballast water in the mixer 7 and sterilized well. Thus, the sterilized ballast water is sent to the ballast tank 2 via the ballast water filling line L2 and is filled therein.

<Residue reduction treatment operation>
In the present invention, the chlorine-based disinfectant contained in the residue remaining in the disinfectant supply device 20, the disinfectant supply pipe 22 and the like without being used for sterilization of the ballast water is reduced, and the residue reduction treatment is performed. The operation will be described.

First, all the valves of the first valve V1, the second valve V2, the third valve V3 and the fourth valve V4 of the ballast water pipe 4 are closed to stop the intake of the ballast water from the sea chest 1 and, together with this, sterilize the ballast water. The eighth valve V8 of the agent supply pipe 22 is also closed, while the tenth valve V10 of the residue injection pipe 40 and the ninth valve V9 of the reducing agent supply pipe 32 are open. Thus, as shown by the thick line in FIG. 4, the line from the disinfectant dissolving device 21 to the confluence point J via the residue injection pipe 40, the ballast water pipe from the reducing agent supply pipe 32 to the reducing agent injection port 4B. 4 to connect to the line leading to the fourth valve V4.

At the time of stopping the operation of taking the ballast water as the ballast water from the outside and stopping the operation of supplying the bactericide to the taken ballast water (the operation of the bactericide pump 23), the bactericide supply device 20 is Disinfectant residue, including disinfectant, remains. Therefore, as described above, the ninth valve V9 and the tenth valve V10 are opened, the line indicated by the thick line in FIG. 4 is brought into a circulation state, the reducing agent pump 33 is operated, and the reducing agent is supplied to the reducing agent supply pipe 32. By supplying fresh water to the disinfectant dissolving device 21 and operating the disinfectant pump 23 while flowing, the disinfectant residue in the device from the disinfectant dissolving device 21 is passed through the residue injection pipe 40 and the reducing agent supply pipe 32. Send to. The disinfectant residue may be sent to the reducing agent supply pipe 32 through the residue injection pipe 40 without supplying fresh water to the disinfectant dissolving device 21.

On the downstream side of the confluence point J of the disinfectant residue and the reducing agent in the reducing agent supply pipe 32, the disinfectant residue and the reducing agent are merged and mixed, and the chlorine-based disinfectant contained in the disinfectant residue is contained. The free available chlorine reacts with the reducing agent to carry out a reduction treatment in which the free available chlorine disappears.

Thus, the mixed liquid of the reducing-treated disinfectant residue and the reducing agent is stored in the ballast water pipe 4 between the reducing agent inlet 4B and the fourth valve V4. If a mixing tank is provided between the confluence point J of the germicide residue and the reducing agent and the oxidation-reduction potentiometer 34, the mixed state of the mixed solution can be further improved. The mixed liquid stored in the ballast water pipe 4 is discharged to the outside of the ship during the ballast water draining operation described later. In addition, the mixed liquid of the reducing-treated disinfectant residue and the reducing agent may be sent into the ballast water pipe 4 and then sent to the ballast tank 2.

A sterilizing agent residue and a reducing agent are thoroughly mixed to promote a reduction treatment for eliminating free available chlorine in the sterilizing agent residue, and a solid substance produced from a chlorine-based sterilizing agent by reacting with the reducing agent. It is preferable to provide a dispersing means for dispersing the precipitate in the form of fine particles in the mixed liquid so as to prevent the component to be precipitated (referred to as a precipitate) from crystallizing and sticking to the inner surface of the apparatus or the pipe. When the solid chlorine-based agent is sodium dichloroisocyanurate, isocyanuric acid precipitates as a solid.

As the dispersion means, for example, a cyclone 35, a circulation line 36 and a pump 37 as shown in FIG. 6 can be provided. As shown in FIG. 6, the cyclone 35 is arranged in a pipe line connecting the confluence point J of the residue injection pipe 40 and the reducing agent supply pipe 32 and the reducing agent injection port 4B of the ballast water pipe 4. In the cyclone 35, a mixed solution of the disinfectant residue and the reducing agent and the reducing agent is received, and the precipitate produced as a solid by the chlorine-based disinfectant by the reaction with the reducing agent is formed into fine particles. Separation into a dispersion liquid dispersed in the mixed liquid and an undispersed liquid containing a precipitate that has not been dispersed and a bactericide residue that has not yet reacted with the reducing agent, and the undispersed liquid is the lower outlet of the cyclone 35. 35A is returned to the inlet 35B side via the circulation line 36, and the solution is injected from the outlet 35C of the cyclone 35 into the ballast water pipe 4 via the reducing agent inlet 4B.

A pump 37 is provided on the inlet side of the cyclone 35, and the pump 37 feeds a mixed liquid of a sterilizing agent residue and a reducing agent into the cyclone 35, and undispersed containing undispersed precipitates. The liquid is returned to the upstream side of the pump 37 through the circulation line 36, merges with the liquid mixture, and is again fed into the cyclone 35. The circulation is repeated to promote dispersion of the precipitate. Thus, the dispersion liquid in which the precipitates are in the form of fine particles dispersed in the liquid mixture is injected into the ballast water pipe 4 through the reducing agent injection port 4B.

In this way, the undissolved liquid is separated by the cyclone and circulated through the circulation line 36, thereby promoting the reduction treatment for eliminating the free available chlorine in the germicide residue of the chlorine-based germicide, and reacting with the reducing agent. The precipitate produced by the chlorine-based disinfectant and precipitated as a solid is dispersed in the mixed solution in the form of fine particles, and this dispersion is injected into the ballast water pipe 4, so that the precipitate crystallizes. It is preferable because it is prevented from sticking to the inner surface of the device or the pipe.

The confluence point J between the disinfectant residue and the reducing agent is formed as a simple tube joining portion between both the residue injecting tube 40 and the reducing agent supply tube 32 in the configuration of FIG. 1, but is shown in FIG. In another embodiment of the present invention, both pipes are connected to a mixing tank 38, in which the germicide residue and the reducing agent are combined and mixed to sufficiently mix the germicide residue and the reducing agent. Can be made to react.

Furthermore, it is preferable that the mixing tank 38 has a stirring member (not shown) so as to stir the mixed liquid of the disinfectant residue of the chlorine-based disinfectant and the reducing agent.

In the mixing tank 38, the disinfectant residue and the reducing agent are mixed and stirred to carry out a reduction treatment for eliminating free available chlorine in the disinfectant residue, and at the same time, a chlorine-based disinfectant is produced by reaction with the reducing agent. Then, the precipitate that precipitates as a solid is dispersed in the liquid mixture in the form of fine particles, and the sufficiently dispersed dispersion is injected into the ballast water pipe 4 through the reducing agent injection port 4B.

As described above, by providing the cyclone 35 and the circulation line 36 shown in FIG. 6 or by providing the mixing tank 38 shown in FIG. 7, the disinfectant residue and the reducing agent are mixed and the disinfectant residue remains. A reduction treatment is performed to eliminate free available chlorine in the product, and the precipitate that is generated from the chlorine-based bactericide and precipitates as a solid by the reaction with the reducing agent is dispersed in the liquid mixture in the form of fine particles. It is possible to prevent the precipitate from crystallizing and sticking to the inside of the pipe to cause a problem such as clogging.

In this residue reduction treatment operation, it is provided on the downstream side of the confluence J of the residue injection pipe 40 and the reducing agent supply pipe 32, and when the mixing tank 38 is provided, it is provided on the mixing tank 38 or on the downstream side of the mixing tank 38. The oxidation-reduction potential meter (ORP meter) 34 is used to measure the oxidation-reduction potential of the mixed solution of the reduction-treated residue and the reducing agent. At that time, the sterilizing agent residue supplied to the residue injecting tube 40 is adjusted so that the redox potential of the mixed solution is 500 mV or more, which indicates that the reducing treatment is sufficiently performed and the free effective chlorine of the sterilizing agent residue is not present. At least one of the flow rate of the substance and the reducing agent supply amount supplied from the reducing agent supply source to the reducing agent supply pipe is controlled. Specifically, the reducing agent flow rate measured by a reducing agent flow meter (not shown) is used to control the reducing agent supply amount by the reducing agent pump 33, the opening control of the tenth valve V10, or the sterilizing agent pump 23. At least one of controlling the flow rate of the disinfectant residue by controlling the discharge amount is performed.

Residual sterilization by supplying the reducing agent in excess of 1.6 times the reducing agent equivalent to the equivalent of the reducing agent required for the reduction treatment with respect to the amount of the sterilizing agent component (free available chlorine) contained in the sterilizing agent residue. The agent component can be surely eliminated.

Thus, in the bactericide residue, the residual bactericide component is completely reduced by supplying an appropriate amount of the reducing agent.

Further, in the present invention, a pH meter for measuring the pH of the mixed solution is provided on the downstream side of the confluence J of the residue injection pipe 40 and the reducing agent supply pipe 32 in place of the oxidation-reduction potentiometer of the illustrated apparatus. When the mixing tank 38 is provided, it is provided on the mixing tank 38 or on the downstream side of the mixing tank 38, and based on the pH measurement value of the mixed solution measured by the pH meter, the disinfectant residue supplied to the residue injection pipe 40 is removed. It is preferable to control at least one of the flow rate and the reducing agent supply amount to be supplied from the reducing agent supply source to the reducing agent supply pipe, because the status of the reduction treatment can be grasped by pH measurement and the treatment can be appropriately advanced. .. The flow rate of the disinfectant residue supplied to the residue injecting pipe 40 so that the pH value of the mixed solution is 5 or more, which indicates that the reduction treatment is sufficiently performed and the free available chlorine of the disinfectant residue is not present, At least one of the reducing agent supply amounts supplied from the reducing agent supply source to the reducing agent supply pipe is controlled. Controlling the reducing agent supply amount by the reducing agent pump 33 with reference to the reducing agent flow rate measurement value by a reducing agent flow meter (not shown), controlling the opening degree of the tenth valve V10 or controlling the discharge amount of the sterilizing agent pump 23. At least one of controlling the flow rate of the disinfectant residue according to.

<Ballast water drainage operation>
Next, the ballast water draining operation for discharging the ballast water stored in the ballast tank 2 to the outside of the ship will be described. All the first valve V1, the second valve V2, and the third valve V3 of the ballast water pipe 4 are closed, and the fifth valve V5 of the first drain pipe 8 and the sixth valve V6 of the second drain pipe 9 are opened. At the same time, the eighth valve V8 of the disinfectant supply pipe 22 is closed and the ninth valve V9 of the reducing agent supply pipe 32 is opened. Thus, as shown by the thick line in FIG. 5, the first drain pipe 8 is connected to the second drain pipe 9 via the bypass pipe 10 to form the ballast water drain line L3. Further, the reducing agent supply pipe 32 is connected to the ballast water pipe 4. By operating the ballast pump 5 and the reducing agent pump 33 in this state, the ballast water drainage operation mode is set.

In this ballast water drainage operation mode, by operating the ballast pump 5, the ballast water stored in the ballast tank 2 is discharged to the outside of the ship via the ballast water discharge line L3. At that time, the ballast water reaches the reducing agent injection port 4B through the bypass pipe 10 without passing through the filtering device 6. On the other hand, the reducing agent pump 33 is operated to supply the reducing agent from the reducing agent tank 31 through the reducing agent supply pipe 32 to the ballast water flowing through the reducing agent inlet 4B in the ballast water drainage line L3 and remain in the ballast water. The free available chlorine of the sterilizing agent is eliminated, and the ballast water is discharged from the drainage port 3 to the outside of the ship in a state where there is no problem in terms of environmental hygiene during drainage.

The mixed liquid of the bactericidal agent residue and the reducing agent, which has been subjected to the reduction treatment during the residue reduction treatment operation, is stored in the ballast water pipe 4, and the stored mixed liquid is the second liquid during the ballast water drainage operation. It flows through the drainage pipe 9 and is discharged to the outside of the ship.

2 ballast tank 5 ballast pump 20 disinfectant supply device 22 disinfectant supply pipe 30 reducing agent supply device 32 reducing agent supply pipe 34 redox potential meter 38 mixing tank 40 residue injection pipe 50 controller J confluence point

Claims (18)

A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and a ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
The ballast water treatment device, when in the ballast water flooding operation mode, a sterilizer supply device including a sterilizer supply pipe for supplying a chlorine-based sterilizer to the ballast water flowing toward the ballast tank, and a ballast water pipe. A reducing agent supply device having a reducing agent supply pipe for supplying a reducing agent to the ballast water flowing inside, and a residue of the chlorine-based disinfectant remaining in the disinfectant supply device after the end of the ballast water flooding operation mode. And a residue injection pipe communicating the sterilizing agent supply pipe with the reducing agent supply pipe so as to inject at least a part of the above into the reducing agent supply pipe of the reducing agent supply device. A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
The ballast water treatment device, when in the ballast water flooding operation mode, a sterilizer supply device including a sterilizer supply pipe for supplying a chlorine-based sterilizer to the ballast water flowing toward the ballast tank, and a ballast water pipe. A reducing agent supply device having a reducing agent supply pipe for supplying a reducing agent to the ballast water flowing inside, and a residue injection pipe for communicating the sterilizing agent supply pipe with the reducing agent supply pipe,
The disinfectant supply device injects at least a part of the residue of the chlorine-based disinfectant remaining in the disinfectant supply device after the end of the ballast water flooding operation mode into the reducing agent supply pipe through the residue injection pipe. ,
In the reducing agent supply device, at least a part of the residue of the chlorine-based bactericide remaining in the bactericide supply device after the end of the ballast water flooding operation mode is injected into the reducing agent supply pipe through the residue injection pipe. The ship is characterized in that the reducing agent is supplied to the reducing agent supply pipe at the time of operation, and the reducing agent is supplied to the ballast water taken out from the ballast tank and discharged to the outside of the vessel in the ballast water drainage operation mode. A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and a ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
The ballast water treatment device, when in the ballast water flooding operation mode, a sterilizer supply device including a sterilizer supply pipe for supplying a chlorine-based sterilizer to the ballast water flowing toward the ballast tank, and a ballast water pipe. A reducing agent supply pipe having a reducing agent supply pipe for supplying a reducing agent to the ballast water flowing therein, and a mixing tank provided in the reducing agent supply pipe for accommodating the reducing agent; and ending the ballast water flooding operation mode. A residue injection pipe for communicating the sterilizing agent supply pipe to the mixing tank so that at least a part of the residue of the chlorine-based sterilizing agent remaining in the sterilizing agent supply device later is injected into the mixing tank of the reducing agent supplying device. A ship comprising:. A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and a ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
The ballast water treatment device, when in the ballast water flooding operation mode, a sterilizer supply device including a sterilizer supply pipe for supplying a chlorine-based sterilizer to the ballast water flowing toward the ballast tank, and a ballast water pipe. A reducing agent supply pipe having a reducing agent supply pipe for supplying the reducing agent to the ballast water flowing therein and a mixing tank provided in the reducing agent supply pipe for accommodating the reducing agent, and the disinfectant supply pipe communicating with the mixing tank. With a residue injection pipe to
The disinfectant supply device injects at least a part of the residue of the chlorine-based disinfectant remaining in the disinfectant supply device after the end of the ballast water flooding operation mode into the mixing tank via the residue injection pipe,
The reducing agent supply device, when at least a part of the residue of the chlorine-based bactericide remaining in the bactericide supply device after the end of the ballast water flooding operation mode is injected into the mixing tank through the residue injection pipe, A vessel characterized by containing a reducing agent in a mixing tank and supplying the reducing agent to the ballast water taken from the ballast tank and discharged to the outside of the vessel in the ballast water drainage operation mode. A pipe between the confluence of the residue injection pipe and the reducing agent supply pipe and the ballast water pipe receives the mixture of the disinfectant residue and the reducing agent, and the chlorine-based disinfectant is generated by the reaction with the reducing agent. Then, the precipitate that precipitates as a solid contains a dispersion in which fine particles are dispersed in the mixed solution, a precipitate that is not dispersed, and a residue of a chlorine-based bactericide that has not yet reacted with the reducing agent. 3. A separation device for separating the dispersion liquid into an undispersed liquid is provided, the undispersed liquid is returned to the inlet side of the separation device, and the dispersion liquid is supplied to a ballast water pipe. The ship described in. Further, at the confluence point of the residue injection pipe and the reducing agent supply pipe, the residue of the chlorine-based bactericide injected into the reducing agent supply pipe merges with the reducing agent in the reducing agent supply pipe to produce a mixed liquid. An oxidation-reduction potential meter for measuring the oxidation-reduction potential is provided at a position downstream from the confluence point that is the ballast water pipe side, and based on the oxidation-reduction potential measurement value of the mixed solution measured by the oxidation-reduction potential meter, A control device for controlling at least one of a flow rate of the residue of the chlorine-based bactericide supplied to the residue injection pipe and a reducing agent supply amount supplied from the reducing agent supply source to the reducing agent supply pipe. The ship according to claim 1 or claim 2. At the confluence point of the residue injection pipe and the reducing agent supply pipe, the residue of the chlorine-based bactericide injected into the reducing agent supply pipe merges with the reducing agent in the reducing agent supply pipe, and the pH of the mixed liquid produced. A pH meter for measuring is provided at a position downstream of the confluence point on the ballast water pipe side, and based on the pH measurement value of the mixed solution measured by the pH meter, chlorine-based sterilization to be supplied to the residue injection pipe. The ship according to claim 1 or 2, further comprising a control device that controls at least one of a flow rate of a residue of the agent and a reducing agent supply amount supplied from the reducing agent supply source to the reducing agent supply pipe. The reducing agent supply device uses a redox potentiometer that measures the redox potential of a mixed liquid produced by the reaction of the chlorine-based bactericide residue with the reducing agent in the mixing tank. Is provided at the downstream side position, which is based on the redox potential measurement value of the mixed solution measured by the redox potential meter, from the flow rate of the residue of the chlorine-based bactericide supplied to the mixing tank and the reducing agent supply source. The ship according to claim 3 or 4, further comprising a control device that controls at least one of the reducing agent supply amounts supplied to the mixing tank. The reducing agent supply device is a mixing tank or a downstream of the mixing tank from the mixing tank on the ballast water pipe side, which measures the pH of the mixed solution produced by the reaction of the chlorine-based bactericide residue with the reducing agent in the mixing tank. At the side position, based on the measured pH value of the mixed solution measured by the pH meter, the flow rate of the residue of the chlorine-based bactericide supplied to the mixing tank and the supply of the reducing agent from the reducing agent supply source to the mixing tank. The ship according to claim 3 or 4, further comprising a control device that controls at least one of the quantities. A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ballast water treatment method on a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside of the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and ballast water taken from the ballast tank is shipped. It is possible to switch to ballast water drainage operation mode that drains outside,
The reducing agent can be supplied from the reducing agent supply device to the ballast water flowing in the ballast water pipe through the reducing agent supply pipe,
In the ballast water flooding operation mode, the chlorine-based germicide is supplied from the germicide supply device to the ballast water flowing toward the ballast tank through the germicide supply pipe, and after the ballast water flooding operation mode is completed. At least a part of the residue of the chlorine-based disinfectant remaining in the disinfectant supply device is passed through a residue injection pipe that connects the disinfectant supply pipe to the reductant supply pipe, and the reducing agent supply pipe of the reducing agent supply device. A method for treating ballast water, which comprises injecting into ballast water. A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ballast water treatment method on a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside of the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and ballast water taken from the ballast tank is shipped. It is possible to switch to ballast water drainage operation mode that drains outside,
The reducing agent can be supplied from the reducing agent supply device to the ballast water flowing in the ballast water pipe through the reducing agent supply pipe,
In the ballast water flooding operation mode, the chlorine-based germicide is supplied to the ballast water flowing toward the ballast tank from the germicide supply device through the germicide supply pipe,
At least a part of the residue of the chlorine-based disinfectant remaining in the disinfectant supply device after the end of the ballast water flooding operation mode, via a residue injection pipe that connects the disinfectant supply pipe to the reducing agent supply pipe. Inject into the reducing agent supply pipe,
When at least a part of the residue of the chlorine-based germicide remaining in the germicide supply device after the end of the ballast water flooding operation mode is injected into the reducing agent supply pipe through the residue injection pipe, the reducing agent supply pipe And a reducing agent is supplied to the ballast water which is taken from the ballast tank and discharged to the outside of the ship in the ballast water drainage operation mode. A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ballast water treatment method on a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside of the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and ballast water taken from the ballast tank is shipped. It is possible to switch to ballast water drainage operation mode that drains outside,
In the ballast water flooding operation mode, the chlorine-based germicide is supplied to the ballast water flowing toward the ballast tank from the germicide supply device through the germicide supply pipe,
After the completion of the ballast water flooding operation mode, the disinfectant is supplied to the mixing tank that stores the reducing agent provided in the reducing agent supply pipe that supplies the reducing agent from the reducing agent supply device to the ballast water flowing in the ballast water pipe. A ballast water treatment method, characterized in that at least a part of the residue of the chlorine-based bactericide remaining in the apparatus is injected through a residue injection pipe that connects the bactericide supply pipe to the mixing tank. A ballast tank for containing ballast water taken from outside the ship, a ballast water pipe for distributing ballast water to or from the ballast tank, a ballast pump for distributing ballast water to the ballast water pipe, and a container for the ballast tank In a ballast water treatment method on a ship equipped with a ballast water treatment device that sterilizes the ballast water before being
The ballast pump is a ballast water operation mode in which ballast water taken from outside of the vessel is circulated toward the ballast tank to be stored or watered in the ballast tank, and ballast water taken from the ballast tank is shipped. It is possible to switch to the ballast water drainage operation mode that drains outside,
In the ballast water flooding operation mode, the chlorine-based germicide is supplied to the ballast water flowing toward the ballast tank from the germicide supply device through the germicide supply pipe,
After the completion of the ballast water flooding operation mode, the disinfectant is supplied to the mixing tank that stores the reducing agent provided in the reducing agent supply pipe that supplies the reducing agent from the reducing agent supply device to the ballast water flowing in the ballast water pipe. At least a part of the residue of the chlorine-based bactericide remaining in the apparatus is injected through a residue injection pipe that connects the bactericide supply pipe to the mixing tank,
When at least a part of the residue of the chlorine-based bactericide remaining in the bactericide supply device after the end of the ballast water flooding operation mode is injected into the mixing tank through the residue injection pipe, a reducing agent is added to the mixing tank. A ballast water treatment method, which is characterized in that a reducing agent is supplied to the ballast water taken from the ballast tank and discharged to the outside of the ship when the ballast water is stored and in the ballast water drainage operation mode. The separation device installed in the pipe between the confluence point of the residue injection pipe and the reducing agent supply pipe and the ballast water pipe receives the mixed liquid of the disinfectant residue and the reducing agent, and reacts with the reducing agent to cause chlorine-based reaction. Dispersion in which the precipitate generated from the disinfectant and precipitated as a solid is dispersed in the liquid mixture in the form of fine particles, the precipitate that is not dispersed, and the chlorine-based disinfectant that has not yet reacted with the reducing agent. The ballast water according to claim 10 or 11, wherein the dispersion liquid is separated into an undispersed liquid containing a residue, the undispersed liquid is returned to the inlet side of the separation device, and the dispersion liquid is supplied to a ballast water pipe. Processing method. At the confluence point of the residue injection pipe and the reducing agent supply pipe, the residue of the chlorine-based bactericide injected into the reducing agent supply pipe merges with the reducing agent in the reducing agent supply pipe to oxidize the resulting mixed liquid. The reduction potential is measured by an oxidation-reduction potentiometer provided at a position downstream of the confluence point on the ballast water pipe side, and based on the measurement value of the oxidation-reduction potential of the mixed solution, a chlorine system supplied to the residue injection pipe The ballast water according to claim 10 or 11, wherein at least one of the flow rate of the sterilizing agent residue and the reducing agent supply amount supplied from the reducing agent supply source to the reducing agent supply pipe is controlled by the control device. Processing method. At the confluence point of the residue injection pipe and the reducing agent supply pipe, the residue of the chlorine-based bactericide injected into the reducing agent supply pipe merges with the reducing agent in the reducing agent supply pipe, and the pH of the mixed liquid produced. Is measured by a pH meter provided on the downstream side of the ballast water pipe side from the confluence point, and based on the measured pH value of the mixed solution, the residue of the chlorine-based bactericide supplied to the residue injection pipe is measured. The ballast water treatment method according to claim 10 or 11, wherein at least one of the flow rate and the reducing agent supply amount supplied from the reducing agent supply source to the reducing agent supply pipe is controlled by the control device. The oxidation-reduction potential of the mixed liquid produced by the reaction of the chlorine-based germicide residue with the reducing agent in the mixing tank is set at the mixing tank or at a position downstream of the mixing tank on the ballast water pipe side. Based on the oxidation-reduction potential measurement value of the mixed solution measured by a reduction potential meter, at least the flow rate of the residue of the chlorine-based bactericide supplied to the mixing tank and the reducing agent supply amount supplied from the reducing agent supply source to the mixing tank. The ballast water treatment method according to claim 12 or 13, wherein one is controlled by a controller. The pH of the mixed liquid produced by the reaction of the chlorine-based bactericide residue with the reducing agent in the mixing tank is measured by a pH meter provided at the mixing tank or at a position downstream of the mixing tank on the ballast water pipe side. Based on the measured pH value of the mixed solution, at least one of the flow rate of the chlorine-based germicide residue supplied to the mixing tank and the reducing agent supply amount supplied from the reducing agent supply source to the mixing tank is controlled by the controller. The ballast water treatment method according to claim 12 or 13, which is controlled.

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