KR20100064768A - Prevention system of adhesion of marine organism - Google Patents

Abstract

PURPOSE: A marine life adhesion preventing system and a seawater supply system using the same are provided to prevent attachment of marine life while restricting production of chlorine-based germicide by sterilizing seawater. CONSTITUTION: A marine life adhesion preventing system comprises the following: an anode(31) and a cathode(32) electrolyzing seawater flowed to a seawater inlet; a direct current power supply(33) supplying direction power supply between the anode and the cathode; an auxiliary electrode(34) electrically connected to the anode; a measuring device(35) measuring electric potential of the auxiliary electrode; and a control unit(36) controlling direct current power. The control unit controls the direct current power supply.

Description

Marine organism attachment prevention system and seawater supply system using the same {PREVENTION SYSTEM OF ADHESION OF MARINE ORGANISM}

The present invention relates to a system for preventing marine organisms from being attached to the seawater intake, and more particularly, to prevent marine organisms from being attached to the seawater intake by sterilizing the seawater intake by electrolyzing seawater. It is about. The present invention also relates to a system for supplying seawater to a tank using a marine life prevention system.

Various plants such as nuclear power plants, thermal power plants, steel mills, and petroleum refining facilities located in the ocean use seawater as cooling water, while live fish tanks on the coast are used to farm live fish. If the seawater intake for supplying seawater to the plant and live fish tank is left unmanaged, marine life such as shellfish and algae is attached to the surface through the process of FIG.

1 shows a process of attaching marine life to the intake port. First, organic matter (protein) adheres to the surface of a seawater treatment structure such as a seawater intake port (S11). On the basis of this organic material, bacteria grow and multiply to form a bacterial layer (S12). Thereafter, organic matter, sludge, etc. in seawater adhere to the bacterial layer to form a slime layer (S13). This takes several hours from the organic (protein) adhesion step to the slime layer formation step as an initial contamination step. Thereafter, algae grow on the slime layer (S14), and the larvae of marine organisms are attached / reproduced / grown by using the algae as a scaffold (S15).

As such, when marine organisms are attached to the seawater intake port, the seawater intake pipe is closed so that the seawater cannot be smoothly supplied to the plant and the live fish tank, which causes a problem of lowering cooling efficiency or dead fish.

Therefore, in the seawater intake facility using seawater, it is an important technical task to prevent marine organisms from attaching to the seawater intake port. As a technique for preventing marine organisms from adhering to the seawater intake, a chemical method, a physical method, a mechanical method, and the like have been conventionally used.

Chemical methods include chlorine coating method, hydrogen peroxide coating method, antifouling paint coating method, and physical methods include ultraviolet irradiation method, ultrasonic method, hot water treatment method, etc., and mechanical methods include filter method and cleaning robot. There is a cleaning method used. However, these conventional methods have problems such as ineffectiveness, short lifespan, and high cost.

As an electrochemical sterilization method to solve the problems of these conventional methods, instead of using chemicals, seawater is electrolyzed to produce chlorine-based disinfectants (hypochlorite, chlorine, sodium hypochlorite), or metal (copper, silver). A method of eluting ions has been proposed.

Publications describing methods of electrolyzing seawater to generate chlorine disinfectants to remove marine organisms include Japanese Patent Application Laid-Open No. 61-143587, Japanese Patent Application Laid-Open No. 61-213384, Japanese Patent Application Laid-Open No. 2-209696, and Japanese Patent Publication. Korean Patent No. 7-207645. In addition, the Republic of Korea Patent Application No. 2006-65175 is a technique of preventing the attachment of marine organisms by using hypochlorous acid by the electric shock and electrolysis as a mixed type of electrochemical method and electrical method.

The marine organism adhesion prevention system by the above-mentioned electrochemical method is comprised of the anode and cathode which electrolyze the seawater which flows into a seawater intake, The chemical species which generate | occur | produce differ according to the potential applied to an anode.

That is, when 0.7 V is applied to the anode based on the SHE potential, electrons move into the cells in the microorganism to interfere with the respiratory transfer enzyme, thereby inhibiting the growth and reproduction of marine organisms. In addition, oxygen (O ₂ ) is generated when 1.2V is applied to the anode based on the standard hydrogen electrode potential, chlorine (Cl ₂ ) is generated when 1.32V is applied, and ozone (O) when 1.5V is applied. ₃ ) can occur, and the growth and reproduction of marine life can be suppressed, respectively. That is, when 0.7 V or more is applied to the anode based on the potential of the standard hydrogen electrode, adhesion of marine life can be prevented.

In the conventional electrochemical method, the marine organism attachment prevention system controls the system by using the overall voltage which is a function of various operating variables such as the potential difference between the anode and the cathode and the concentration and temperature of the seawater, so that the potential applied to the anode is equal to the standard hydrogen. When the electrode potential exceeds 1.32V occurs, in this case, an oxidation reaction occurs in the positive electrode as shown in Scheme 1, and a chlorine component is generated, and a reduction reaction as shown in Equation 2 occurs in the negative electrode.

_{^{(Anode) 2Cl - → Cl 2 + 2e}} - [1.32V]

(Cathode) 4H ⁺ + 4e- → 4H [0.0V]

In addition, chlorine generated at the anode reacts with water to produce hypochlorous acid as shown in Scheme 3, and the hypochlorous acid is converted into hypochlorous acid, chlorine, and sodium hypochlorite according to pH, and all of these chlorine disinfectants have strong bactericidal power.

_{(Anode) H 2 O + Cl 2 ↔} HClO + H + + Cl -

This chlorine disinfectant has a very strong sterilizing function to prevent marine organisms from adhering to the sea intake, but when the concentration is high, it can kill fish in the live fish tank and adversely affect the human body.

An object of the present invention devised to solve the above-mentioned problems of the prior art is to install a seawater electrolysis device in a seawater intake port, by controlling a potential of 0.7V or more and 1.2V or less to be applied to the anode of the seawater electrolysis device. In addition, the present invention is to provide a system that can prevent the attachment of marine organisms while suppressing the occurrence of chlorine-based fungicides. In addition, it is also to provide a system for supplying seawater to the tank by applying the marine organisms adhesion prevention system of the present invention.

Marine life adhesion prevention system according to an embodiment of the present invention for achieving the above object, the anode and cathode which is electrically insulated and electrolyzes seawater flowing into the seawater intake, and the DC power supply between the anode and the cathode A direct current power supply for supplying a power supply; an auxiliary electrode electrically connected to the anode; an auxiliary electrode applied with a potential equal to the potential applied to the anode; a meter for measuring the potential of the auxiliary electrode; and a measurement of the auxiliary electrode measured by the meter. And a control means for controlling the DC power supplied between the positive electrode and the negative electrode in the DC power supply so that the electric potential maintains the electric potential value in a predetermined range.

In addition, the seawater supply system according to an embodiment of the present invention, an electrolysis device for electrolyzing seawater to prevent marine organisms adhere to the seawater intake, and the effective chlorine component contained in the seawater passing through the electrolysis device It characterized in that it comprises a dechlorination apparatus to remove.

According to the present invention, by measuring the potential of the positive electrode using the auxiliary electrode and controlling the DC power applied between the positive electrode and the negative electrode based on the measured potential of the positive electrode, while preventing the generation of chlorine-based fungicides while preventing the attachment of marine life It can work. In addition, it is possible to cleanly manage the seawater intake port, there is an effect that can smoothly supply the seawater to the tank for a long time.

Hereinafter, with reference to the accompanying drawings will be described in more detail the marine life attachment prevention system and seawater supply system using the same according to the present invention.

2 is a schematic illustration of a system for supplying seawater to a water tank according to this invention. The seawater supply system according to the present invention includes an electrolysis device 21, a pump 22, and a dechlorination device 23. When the pump 22 is operated, seawater is introduced through the electrolysis device 21, and electrolysis of the seawater in the electrolysis device 21 prevents marine life from being attached to the seawater intake port. That is, in this invention, the electrolysis device and the marine organism adhesion prevention system are the same device. On the other hand, the electrolysis device 21 is limited to the electromotive force applied to the positive electrode as described below to 1.2V or less does not generate a chlorine component, but in case chlorine component occurs through the electrolysis device 21 in case, Seawater containing chlorine is passed through the dechlorination apparatus 23 so that the chlorine is removed and then supplied to the water tank 24.

3 is a schematic configuration diagram of the electrolysis device 21. The electrolysis device includes a positive electrode 31 and a negative electrode 32 for electrolyzing seawater flowing into the intake port, a DC power supply 33 for supplying a DC power between the positive electrode 31 and the negative electrode 32, and a positive electrode. The auxiliary electrode 34 electrically connected to the 31 and applied with the same potential applied to the anode 31, the measuring unit 35 for measuring the potential of the auxiliary electrode 34, and the measuring unit 35. And control means 36 for controlling the DC power supplied from the DC power supply 33 between the anode 31 and the cathode 32 based on the measured potential value of the auxiliary electrode 34. When the DC power supply of the DC power supply 33 is supplied to the anode 31 and the cathode 32 of the electrolysis device, seawater is electrolyzed to prevent marine life from being attached to the seawater intake port. Detailed description of the marine organism attachment prevention function of the electrolysis device will be described later.

On the other hand, the dechlorination unit 23 is preferably an activated carbon packed column filled with activated carbon. If an overvoltage of 1.2 V or more is applied to the anode of the electrolysis device 21 to generate a chlorine component in the electrolysis device, the dechlorination device 23 removes the chlorine component from the seawater, thereby removing the chlorine component from the tank. (24) Prevent entry into Reaction formula for removing the active chlorine by the activated carbon constituting the dechlorination unit 23 is shown in Scheme 1.

C + HOCl → C * O + H + + Cl -

Hereinafter, the seawater electrolysis apparatus which is a marine organism adhesion prevention system is explained in full detail. The seawater electrolysis device 21 of the present invention is mounted on the front of the intake port of the seawater intake pipe for supplying seawater to the water tank so that the seawater flows into the intake pipe after passing through this electrolysis device. In the state where the positive electrode 31 and the negative electrode 32 are electrically insulated, when a direct current power is applied between the positive electrode 31 and the negative electrode 32, current flows from the positive electrode 31 to the negative electrode 32 through seawater. do.

The anode 31 and the cathode 32 are made of a metal material suitable for seawater. For example, suitable metal materials include titanium, tantalum, monel, stainless steel, and the like. The most suitable metal material for seawater is titanium. That is, the positive electrode 31 and the negative electrode 32 are preferably coated with a metal having excellent electrical conductivity on a titanium base material. Plating groups such as ruthelium, tin, iridium, platinum, rhodium, and palladium may be used as coating materials having excellent electrical conductivity. Noble metals, and the like, by mixing at least one of these metals and coating them by high temperature oxidation treatment. As an anode catalyst for producing the anode 31, a mixture of platinum, tin and iridium is preferable.

The potential of the anode 31 required for electrolysis is preferably 0.7V to 1.2V based on the auxiliary electrode 34. A plurality of auxiliary electrodes 34 are provided at a plurality of positions of the anode 31, and the potentials of the plurality of auxiliary electrodes 34 are respectively measured and applied between the anode 31 and the cathode 32 based on the maximum value. Control the DC power supply. When a potential of 1.2 V or more is applied to the anode 31, a chlorine-based fungicide is generated, and when the potential is less than 0.7 V, the microbial removal efficiency rapidly decreases. Therefore, the potential of the auxiliary electrode 34 is controlled to be maintained at 0.7V to 1.2V.

In addition, the current flowing between the anode 31 and the cathode 32 is preferably 0.01 kA / m ² to 1.2 kA / m ² based on the current density of the anode 31. If the current density of the anode 31 is 1.2 kA / m ² or more, chlorine may be generated. If the current density is 0.01 kA / m ² or less, the microbial sterilization efficiency is lowered.

The plurality of auxiliary electrodes 34 of the present invention may be manufactured in a line or rod shape having a predetermined size, and may be manufactured in any other shape. The material can be any metal that is compatible with seawater, most preferably made of platinum-plated titanium rods.

Figure 4 (a) is a view showing the structure of the anode, cathode and auxiliary electrode of the electrolytic apparatus according to an embodiment of the present invention, (b) is between the anode and the cathode configured as shown in Figure 4 (a) A diagram showing a flowing current.

The negative electrode 32 and the positive electrode 31 are sequentially mounted to communicate with the water intake pipe 40 on an extension line of the water intake pipe 40 on the front of the water intake pipe 40. The positive electrode 31 and the negative electrode 32 are electrically insulated by the insulator 41, and the seawater is connected to the intake pipe 40 through the positive electrode 31 and the negative electrode 32. do. The anode 31 is provided with a plurality of auxiliary electrodes 34a, 34b, 34c at a plurality of positions in the longitudinal direction of the tube. Preferably, the plurality of auxiliary electrodes 34a, 34b, and 34c are provided at regular intervals.

When a direct current power is applied between the anode 31 and the cathode 32, a current flow with a current flow angle of 180 degrees is formed between the anode 31 and the cathode 32 as shown in FIG. do.

Among the plurality of auxiliary electrodes 34a, 34b, and 34c, the potential of the auxiliary electrode 34a provided near the cathode 32 is greater than the potential of the auxiliary electrode 34c provided far from the cathode 32. The measuring device measures the potentials of the plurality of auxiliary electrodes 34a, 34b, 34c, respectively, and provides them to the control means, and the control means controls the DC power supply based on the largest value among them, such that the positive electrode 31 and the negative electrode 32 Control the DC power supplied between

Figure 5 (a) is a view showing the structure of the anode, cathode and auxiliary electrode of the electrolytic apparatus according to another embodiment of the present invention, (b) is between the anode and the cathode configured as shown in Figure 5 (a) A diagram showing a flowing current.

The cathode 32 is mounted in the vertical direction on the front of the intake port 40 of the intake pipe 40, and the anode 31 is mounted on the front surface thereof so as to communicate with the intake pipe 40. The positive electrode 31 and the negative electrode 32 are electrically insulated by the insulator 41. The anode 31 has a tubular shape into which seawater is introduced. The central portion of the cathode 32 communicating with the water intake pipe 40 is in the shape of a net, and the outer portion of the cathode 32 connected to the anode 31 through the insulator 41 is plate-shaped. Seawater flows into the intake pipe 40 through the net portions of the anode 31 and the cathode 32. The anode 31 is provided with a plurality of auxiliary electrodes 34a, 34b, 34c at a plurality of positions in the longitudinal direction of the tube. Preferably, the plurality of auxiliary electrodes 34a, 34b, and 34c are provided at regular intervals.

When a direct current power is applied between the anode 31 and the cathode 32, a current flow with a current flow angle of 90 degrees is formed between the anode 31 and the cathode 32 as shown in FIG. do.

Among the plurality of auxiliary electrodes 34a, 34b, and 34c, the potential of the auxiliary electrode 34a provided near the cathode 32 is greater than the potential of the auxiliary electrode 34c provided far from the cathode 32. The measuring device measures the potentials of the plurality of auxiliary electrodes 34a, 34b, 34c, respectively, and provides them to the control means, and the control means controls the DC power supply based on the largest value among them, such that the positive electrode 31 and the negative electrode 32 Control the size of DC power supplied between

Figure 6 (a) is a view showing the structure of the anode, cathode and auxiliary electrode of the electrolytic apparatus according to another embodiment of the present invention, (b) is the anode and cathode configured as shown in Figure 6 (a) A diagram showing the current flow in the liver.

The cathode 32 is mounted in the vertical direction on the front of the intake port 40 of the intake pipe 40, and the anode 31 is mounted on the front surface thereof so as to communicate with the intake pipe 40. The positive electrode 31 and the negative electrode 32 are electrically insulated by the insulator 41, and the positive electrode 31 has a tubular shape into which seawater flows. The center portion of the cathode 32 in communication with the water intake pipe 40 is in the shape of a net, and the outer portion of the cathode 32 connected to the anode 31 through the insulator 41 is plate-shaped. In addition, a cathode rod 32 'electrically connected to the cathode 32 is installed to penetrate the center of the cathode 31 tube.

Sea water is introduced into the intake pipe 40 through the anode (31) pipe. The anode 31 is provided with a plurality of auxiliary electrodes 34a, 34b, 34c at a plurality of positions in the longitudinal direction of the tube. Preferably, the plurality of auxiliary electrodes 34a, 34b, and 34c are provided at regular intervals.

When a direct current power is applied between the anode 31 and the cathode 32, that is, the cathode rod 32 ', as shown in FIG. 4 (b), 0 between the anode 31 and the cathode rod 32' is obtained. A current flow with a current flow angle of degrees is formed. The measuring device measures the potentials of the plurality of auxiliary electrodes 34a, 34b, 34c, respectively, and provides them to the control means, and the control means controls the DC power supply based on the largest value among them, such that the positive electrode 31 and the negative electrode 32 That is, the size of the DC power supplied between the cathode rods 32 'is controlled.

[Application Example of this Invention]

Device and operating conditions

(1) Anode of electrolysis device: 100mm diameter tube, 20cm length

(2) Cathode of electrolysis device: titanium tube with diameter of 100mm, length 20cm

(3) Auxiliary electrodes: Platinum-plated titanium rods with a diameter of 5 mm, installed at three equal intervals

(4) Installation method: Figure 4

(5) Operating conditions: current density 0.2 kA / m ² , 25 ℃, potential 1.2V of anode

Driving place

We compared and tested marine marine anti-fouling systems in Masan offshore.

result

(1) According to the present invention, even when the seawater was electrolyzed, there was almost no change in the physical properties of the seawater (particularly a change in the amount of chlorine, etc.). Table 1 summarizes the physical properties of the seawater passing through the present invention.

Analysis item unit Analytical value Water quality standard pH 8.2 7.5-8.5 Electrical conductivity μS / cm 46,900 Dissolved oxygen 6.8 6-10 Cl- 19,000 18,000-22,000 COD 1.8 Less than 4 Residual chlorine 0.05 Foreground view ppm 7,100 Ca ppm CaCO ₃ 430 Mg ppm 1,500

(2) While maintaining the electrode potential of the anode at 1.2V, the operating current of the electrochemical reactor of the marine organism adhesion prevention system was measured, and this is converted into the current density and shown in FIG. As a result, it can be seen that the electrolysis apparatus is controlled very stably for a long time.

(3) After approximately three months of operation, weigh the attached marine organisms. When the marine organism attachment prevention system according to the present invention was not installed, various marine organisms were attached in large quantities (about 6 kg). On the other hand, when the marine life attachment prevention system according to the present invention is installed, marine life is not attached.

effect

Through this experiment, it can be confirmed that the marine organism attachment prevention effect by the marine organism attachment prevention system according to the present invention is very excellent.

In the above description, the technical idea of the marine organism attachment prevention system and the seawater supply system using the same has been described with the accompanying drawings, but this is by way of example and not by way of limitation. . In addition, it is a matter of course that various modifications and variations are possible without departing from the scope of the technical idea of the present invention by anyone having ordinary skill in the art.

1 is a view illustrating a process of attaching marine life to the intake port;

2 schematically shows a system for supplying seawater to a water tank according to this invention,

3 is a schematic configuration diagram of an electrolysis device according to the present invention;

Figure 4 (a) is a view showing the structure of the anode, cathode and auxiliary electrode of the electrolytic apparatus according to an embodiment of the present invention, (b) is between the anode and the cathode configured as shown in Figure 4 (a) A diagram illustrating a flowing current flow,

Figure 5 (a) is a view showing the structure of the anode, cathode and auxiliary electrode of the electrolytic apparatus according to another embodiment of the present invention, (b) is between the anode and the cathode configured as shown in Figure 5 (a) A diagram illustrating a flowing current flow,

Figure 6 (a) is a view showing the structure of the anode, cathode and auxiliary electrode of the electrolytic apparatus according to another embodiment of the present invention, (b) is the anode and cathode configured as shown in Figure 5 (a) Shows a current flow in the liver,

Figure 7 is a graph showing the current density measurement value over time in the operating state of the marine life attachment prevention system according to the present invention.

Claims (28)

An anode and a cathode which are electrically insulated and electrolyze the seawater flowing into the seawater intake; A DC power supply for supplying DC power between the anode and the cathode; An auxiliary electrode electrically connected to the anode and having a potential equal to that applied to the anode; A measuring instrument for measuring the potential of the auxiliary electrode; And control means for controlling a DC power supplied between the anode and the cathode from the DC power supply so that the potential of the auxiliary electrode measured by the measuring instrument maintains a potential value within a predetermined range. . The marine life attachment prevention system according to claim 1, wherein the control means controls the DC power supply so that the potential of the auxiliary electrode is 0.7V to 1.2V. The method of claim 1, wherein the anode is one of titanium, tantalum, monel, stainless steel, or a coating of one or two or more platinum group precious metals including ruthelium, tin, iridium, platinum, rhodium, and palladium to the titanium base material. Marine life attachment prevention system, characterized in that one. The method of claim 1, wherein the cathode is one of titanium, tantalum, monel, stainless steel, or a coating of one or two or more platinum group precious metals including ruthenium, tin, iridium, platinum, rhodium, and palladium to the titanium base material. Marine life attachment prevention system, characterized in that one. The marine life attachment prevention system according to claim 1, wherein the control means controls the DC power supply such that the current density of the anode is 0.01 kA / m ² to 1.0 kA / m ² . The marine organism attachment prevention system of claim 1, wherein the auxiliary electrode is a platinum-plated titanium rod. The method of claim 1, wherein a plurality of auxiliary electrodes are provided at different positions of the anode, the measuring instrument measures the potential of the plurality of auxiliary electrodes, and the control means is a maximum value of the potential values of the plurality of auxiliary electrodes. Marine life attachment prevention system, characterized in that for controlling the DC power supply on the basis of. The cathode and the cathode of claim 1, wherein the anode and the cathode are mounted on a front surface of the seawater intake port, and the seawater flowing into the intake pipe is installed to sequentially pass through the anode, the cathode, and the intake port. Marine life prevention system. 9. The marine organism attachment prevention system according to claim 8, wherein the anode has a tubular shape in communication with the intake pipe and through which seawater passes. 10. The marine life attachment prevention system according to claim 9, wherein the cathode is tubular in communication with the intake pipe and through which seawater passes. The marine organism attachment prevention system according to claim 9, wherein the cathode has a plate shape perpendicular to the tube length direction of the anode. 12. The marine life attachment prevention system of claim 11, further comprising a cathode rod electrically connected to the cathode and penetrating through a tube center of the anode. 10. The marine life attachment prevention system according to claim 9, wherein a plurality of auxiliary electrodes are provided at a plurality of positions different from each other in the tube length direction of the anode. A seawater supply system comprising an electrolysis device for electrolyzing seawater to prevent marine organisms from attaching to the seawater intake, and a dechlorination device for removing effective chlorine contained in seawater passing through the electrolysis device. 15. The method of claim 14, wherein the electrolysis device is electrically insulated and positive and negative electrodes for electrolyzing seawater flowing into the seawater intake, A DC power supply for supplying DC power between the anode and the cathode; An auxiliary electrode electrically connected to the anode and having a potential equal to that applied to the anode; A measuring instrument for measuring the potential of the auxiliary electrode; And control means for controlling a DC power supplied between the anode and the cathode from the DC power supply so that the potential of the auxiliary electrode measured by the measuring instrument maintains a potential value within a predetermined range. The seawater supply system according to claim 15, wherein the control means controls the DC power supply so that the potential of the auxiliary electrode is 0.7V to 1.2V. The method of claim 15, wherein the anode is one of titanium, tantalum, monel, stainless steel, or a coating by mixing one or more platinum group precious metals including ruthelium, tin, iridium, platinum, rhodium, palladium to the titanium base material Sea water supply system characterized in that. The method of claim 15, wherein the cathode is titanium, tantalum, monel, stainless steel, or a coating of one or two or more platinum group precious metals including ruthelium, tin, iridium, platinum, rhodium, palladium to the titanium base material Sea water supply system characterized in that. The seawater supply system according to claim 15, wherein the control means controls the DC power supply so that the current density of the anode is 0.01 kA / m ² to 1.0 kA / m ² . The seawater supply system according to claim 15, wherein the auxiliary electrode is a titanium rod plated with platinum. The method of claim 15, wherein a plurality of auxiliary electrodes are provided at different positions of the anode, the measuring instrument measures the potential of the plurality of auxiliary electrodes, the control means is the maximum value of the potential value of the plurality of auxiliary electrodes Sea water supply system characterized in that for controlling the DC power supply on the basis of. 22. The method according to any one of claims 15 to 21, wherein the positive electrode and the negative electrode are mounted on the front of the water intake port, seawater flowing into the intake pipe is installed so as to sequentially pass through the positive electrode, the negative electrode and the intake port. Seawater supply system. 23. The seawater supply system as claimed in claim 22, wherein the anode is tubular in communication with the intake pipe and through which seawater passes. 24. The seawater supply system as claimed in claim 23, wherein the cathode has a tubular shape in communication with the intake pipe and through which seawater passes. 24. The seawater supply system according to claim 23, wherein the cathode has a plate shape perpendicular to the tube longitudinal direction of the anode. 27. The seawater supply system as claimed in claim 25, further comprising a cathode rod electrically connected to the cathode and penetrating through a tube center of the anode. 24. The seawater supply system according to claim 23, wherein a plurality of auxiliary electrodes are provided at a plurality of positions different in distance from the cathode in the tube length direction of the anode. 16. The seawater supply system according to claim 14 or 15, wherein the dechlorination apparatus is an activated carbon packed column.

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