JPH0710081A - Method for preventing propagation of marine organism by ac electric signal - Google Patents

Abstract

PURPOSE:To suppress the propagation and attachment of marine organism by making use of the AC current in the sea water, activating the cell motion in the marine organism based on the potential difference, and rising the temperature of the marine organism. CONSTITUTION:The output of an AC signal generating device 1 is introduced by a cable 2 and a resistor 3 is attached thereto. An electrode 4 is connected to this resistor 3. The electrode 4 is put into the sea water. The potential difference is generated in the vicinity of the marine organism by making use of the AC current where the polarity is changed as the time. The cells of the marine organism is bipolarized by this potential difference to activate the cells of the marine organism and to rise the temperature so as to have illusion that it is in the environment difficult to live in, leading to suppression of the growth thereof. As a result, the reduction of the intake efficiency in a facility making use of the sea water as the cooling water due to the propagation of the marine organism is prevented.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION The present invention can eliminate the following drawbacks by using it for the bottom of a ship and equipment using seawater as cooling water. (B) Propagation of marine organisms in equipment that uses seawater as cooling water can cause problems due to reduced water intake efficiency. (B) Propagation of marine organisms in equipment that uses seawater as cooling water causes blockage of the heat exchanger's thin tubes and pipes, which in turn reduces the operating efficiency of the entire equipment due to reduced heat exchange efficiency. . (C) When marine life propagates on the bottom of the ship, the resistance due to water increases, which reduces the navigation speed and increases fuel consumption.

[0001]

[Prior art]

(B) Conventionally, in order to remove marine organisms, seawater is regularly drained and human hands are used to remove the propagated marine organisms. It is uneconomical and dangerous and requires heavy labor. (B) Special paints are applied to control the growth of marine organisms, but their main components contain many components that cause environmental damage. Has become. (C) Although paints that use surface tension are also used, their effect on workability and cost is short and cost is high. (D) A method of attaching an iron electrode to the surface of the structure and applying a direct current to continuously dissolve the iron electrode to suppress reproduction is also being tested, but it is necessary to replace the iron electrode at that time. You have to stop the equipment temporarily. (E) When removing marine organisms in areas that cannot be drained, they are manually removed by specialized divers. (F) Robots for removing marine organisms have also been developed, but there are still problems in practical use. (G) There is a method of killing marine organisms by injecting chlorine gas or an electrolytic solution such as hypochlorous acid, but this causes environmental damage. Although the method that has been taken conventionally is described here, there is no such method as a method to prevent the reproduction of marine organisms,
Currently, the main method is to remove marine organisms, and the current situation is that there are difficulties in treating the removed marine organisms and the sludge generated when the marine organisms are removed. Is.

[0002]

[Problems to be Solved by the Invention] (a) Is it possible to suppress the reproduction of marine organisms without destroying the environment? (B) Is it possible to suppress the reproduction of marine organisms continuously over a long period of time? (C) Is it possible to control the reproduction of marine organisms in areas where drainage is not possible? The present invention has been made based on the above strong demands.

[0003]

[Means for Solving the Problems] The structure will now be described. First, an alternating current is made to flow in seawater. Seawater is considered as a conductor because its electric resistance is close to 0Ω, and this means is established. The current density of the alternating current is higher on the surface because of the skin effect. In other words, the height increases around marine organisms that propagate by sticking to the structure by sticking the foot thread, and by adhering to the structure such as barnacles and oysters. In addition, since the alternating current changes its polarity with time, a potential difference is generated around the marine organism. Due to this potential difference, cells of marine organisms are dipolarized to move the cells of marine organisms to raise body temperature, make the illusion of an environment difficult to live in, and suppress reproduction. The configuration of the device will be briefly described below. (B) Pull the output of the AC signal generator 1 with a cable and attach the resistor 3. (B) Attach the electrode 4 to the resistor of 3. (C) The electrode 4 is placed in seawater to generate a potential difference around the marine organism 5.

[0004]

Embodiment 1 The following can be applied as an application example of the present invention. The output of the alternating-current signal generator is set so that a sufficient output can be obtained by the electric resistance of seawater, so that the resistor 3
Can be omitted.

[0005]

[Embodiment 2] The following can be applied as an application example of the present invention. Instead of the cable used here, any material such as a waveguide that can transmit the output of the AC power supply device without loss may be used.

[0006]

EFFECTS OF THE INVENTION According to the present invention, it is possible to suppress the growth and adhesion of marine organisms and reduce the amount of shellfish that is conventionally removed manually. By reducing the amount of marine organisms, it is possible to reduce heavy labor and shorten the construction period. At the same time, the operating rate of equipment can be improved. In addition, because it raises the body temperature of marine organisms and confuses them with the environment that makes them difficult to live in and suppresses their reproduction, the impact on the environment is extremely low.

[0007]

[Brief description of drawings]

FIG. 1 Outline of the apparatus of the present invention

[Explanation of symbols]

 1 is an AC power supply device 2 is a signal transmission cable 3 is a resistor 4 is an electrode 5 is a marine organism

Claims (1)

[Claims] 1. A method for preventing the reproduction of marine organisms by utilizing alternating current in seawater to activate the cell movement in the marine organisms and increase the body temperature of the marine organisms by the potential difference between the alternating currents.