JPH02265421A - Formation of seaweed bed - Google Patents

Abstract

PURPOSE:To effectively clean the surface of a seaweed bed by connecting an anode to a seaweed bed made of an electrically conductive material and placed in the sea and passing electric current to the seaweed bed. CONSTITUTION:A seaweed bed 3 made of an electrically conductive material as a part or the total of the seaweed bed is placed on the sea bottom 1 and used as a cathode. Another seaweed bed 2 made of an electrically conductive material is placed near to the former seaweed bed 3 and used as an anode. A DC current is passed between the seaweed beds 2 and 3 to form an electro- deposited layer on the surface of the seaweed bed 3 and seaweed is grown on the layer. Thereafter, the seaweed beds 2, 3 are connected to a power source 5 in a ship 4 through a cable 6 to effect the electrolysis of sea water and the dissolution of the deposited layer to restore the surface of the seaweed bed to the original electrically conductive state.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a method for creating an algae reef that purifies the algae reef using an oxidizing atmosphere generated by electrolysis of seawater, and an application of electrodeposition technology. The present invention relates to a method for cleaning algal reefs formed by electrolyzing seawater and depositing electrodeposit on the surface of a conductive structure.

[Conventional technology]

A structure such as a fish reef or a seaweed reef (hereinafter simply referred to as a seaweed reef) is created in the sea using conductive materials such as metal plates or steel, an anode is installed near the seaweed reef, and the algae reef itself is used as a cathode. A direct current is passed between both electrodes to electrolyze the seawater, and the electrodeposit obtained by the electrolysis (mainly a calcium compound: CaCO, or a magnesium compound: Mg(OH)z) is applied to the algae reef. By depositing it on the surface, it modifies the metal surface and makes it easier for seaweed spores to grow on it. This precipitate protects the surface of the metal and provides an anti-rust effect.

The electrodeposit deposited on the surface of the conductive material by electrolysis is a component contained in seawater, and has a property that allows seaweed spores to easily adhere to the surface. The purpose is to encourage the growth of useful seaweed that is useful for growing fish such as kelp and kelp, thereby attracting fish.

This type of algae reef is advantageous in that it allows the use of waste materials such as steel frame materials from buildings and door moving vehicles, and has recently come into widespread use.

[Problem to be solved by the invention]

The thickness of the electrodeposited material increases in proportion to the time the electricity is applied, and it gradually grows like the growth rings of a tree.
Since this electrodeposited material is non-conducting or hardly conductive, no new electrodeposited material will be formed even if current is continued to be applied once the thickness reaches this thickness.

In addition, if a seaweed reef is used for a long period of time, as with conventional artificial seaweed reefs, it will gradually become overgrown with miscellaneous seaweeds, the ability of spores to settle on it will gradually decrease, the reproductive ability of seaweed will decline, and useful seaweeds will flourish. The problem is that it no longer works. Under these circumstances, consideration has been given to periodically applying electricity to regenerate (coat) the electrodeposited substrate to make it easier for spores to settle on it, and to maintain the algae reef effect over a long period of time.

However, if the surface of a structure made of conductive material is regenerated (coated) with electrodeposit as described above and this process is repeated many times, the thickness of the electrodeposit will gradually increase, and eventually even if electricity is applied, the electrodeposit will not be regenerated. A problem arises in that no electrodeposit is formed, and the ability of spores to attach to the spores cannot be enhanced.

An object of the present invention is to solve the problem that the ability of useful seaweeds to flourish in the conventional artificial algae reef gradually decreases while the fish reef or algae reef is used.

[Means to solve the problem]

According to various experiments conducted by the present inventors, the current density A was set to 0.0
1 to 10o+A/cn+'', it was confirmed that electrodeposit adhered to the cathode side, but shellfish such as oysters and Fujibbo, and seaweed did not adhere to the anode side.

As a result of further experiments, it was found that when an anode was connected to a reef with electrodeposit on the surface and seaweed had grown on it, the seaweed, oysters, and shellfish such as Fujibushi that had adhered to the surface would fall off. confirmed.

When examining the atmosphere on the anode side, it was confirmed that an oxidizing atmosphere was formed and had a bactericidal effect or a cleaning effect due to the dissolution of the calcium matrix. In this experiment, it was confirmed that the solubility of the calcium substrate is high when the PTI of the surface of the anode is about 3 or less.

The present invention was obtained based on the above findings, and includes:
When a seaweed reef is simply installed in the sea and seaweed naturally grows on its surface, when the ability of the seaweed to reproduce has decreased, an anode current is applied to the surface of the seaweed reef using the reef as an anode. This process cleans the seaweed and removes miscellaneous seaweed, etc., to form a new algae reef surface.

More preferably, a structure made of a conductive material installed in the sea is used as a cathode, an anode is placed near the cathode, and a direct current is passed between the picture electrodes to form an electrodeposit on the surface of the structure. seaweed grows on its surface. Then, when the ability of this seaweed to flourish has decreased, or when miscellaneous seaweed unsuitable for fish and shellfish farming has grown, electricity is applied to the structure as an anode to dissolve the electrodeposit that has formed on the structure. death,
The present invention provides a method for creating an algae reef, which is characterized by removing organisms attached to the surface of the algae reef.

In the present invention, if the reproductive ability of useful seaweeds on a seaweed reef decreases, and conversely the reproduction of miscellaneous seaweeds increases, the oxidizing atmosphere generated on the anode side by energizing the seaweed reef as an anode. It promotes the reproduction of useful seaweed by using the bactericidal or cleaning effect to clean the surface of the algae reef or the surface of the electrodeposit formed on the surface through electrolysis. .

[For production]

When electrolyzed in seawater, chlorine gas is generated from the surface of the anode through the chemical reaction shown below, and some of it dissolves into the seawater, producing a strong acidic substance called hypochlorous acid (HCi) on the surface of the anode. It is formed as a film.The amount of this strongly acidic substance produced increases according to the amount of current, and the pH near the anode decreases accordingly.When the pH drops to about 3 or less, the solubility of the calcium substrate increases rapidly. This has been confirmed.

2Ci! −→α4 +2e− C5! z + Ht O→HC1! O+ Hto+α-
HCf! O → αO−+) (+ Figure 2 is a graph drawn with the horizontal axis representing the amount of anode reaction and the vertical axis representing the amount of pHO in seawater. As the pH of seawater decreases, the amount of reaction gradually decreases. You can see how it decreases.

Furthermore, FIG. 3 is a graph in which the horizontal axis represents the distance from the anode and the vertical axis represents the pH of the seawater, and it can be seen that the pH rapidly decreases in the area near the anode.

Therefore, the electrodeposit that has already been formed on the surface of the algae reef is dissolved, and the miscellaneous seaweed that was growing on the surface falls off, forming a new clean surface. A surface is formed to which the spores of useful seaweeds can easily adhere, allowing new useful seaweeds to flourish and cultivating fish, shellfish, and other aquaculture products using these useful seaweeds.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

The figure shows the concept of the present invention, in which a seaweed reef (hereinafter fish reef and seaweed reef are collectively referred to as seaweed reef) 2, which is partially or entirely made of conductive material, is installed on the seabed l. is used as a cathode, an anode is placed near this algae reef, and electricity is applied between the two to cause electrodeposit to adhere to the surface of the algae reef, forming a base to which useful seaweed spores can easily attach. Grow useful seaweed on top. This condition is similar to that of ordinary electrolyte reefs (fish reefs).

In this embodiment, an existing algae reef 3 is installed near the algae reef 2, and a case will be described in which this algae reef 3 is used as a cathode.

As described above, the algae reefs 2 and 3 and the power source 5 provided in the ship 4 are connected via the cable 6.

The side of algae reef 2 where the ability of useful seaweed spores to settle or the ability of useful seaweed to reproduce has decreased is defined as the positive side, and the side of other algae reef 3
Electrify with the side as the negative side.

While the algae reef 2 is connected to the anode, the surface thereof, especially the electrodeposit that has already been formed and the seaweed that has grown on the surface, gradually dissolve and fall off due to the dissolving and sterilizing effects peculiar to the anode. A cleaned surface will be created. Thereafter, seaweed spores adhere to the surface of the cleaned algae reef and are grown, resulting in a seaweed reef in which useful seaweeds have proliferated.

On the other hand, when the algae reef 3 connected to the negative side is energized, new electrodeposits are deposited on the base surface of the algae reef 3, and a base for adhering seaweed spores is again formed, thereby enhancing the algae reef effect.

Below, various conditions etc. for implementing the present invention will be explained.

(1) Structure of a seaweed reef and its materials The structure of a seaweed reef has a large internal space in order to enhance the effect of cultivating the fish that accompany the production of seaweed.

Steel is the most suitable material for this algae reef. Other types of structures include those with a carbon-based material layer formed on the surface on which seaweed grows, those coated with conductive paint, or composites or impregnated with conductive materials such as conductive concrete. In order to propagate seaweed or the surface on which electrodeposit is deposited, a conductive surface is used.

(2) Timing of energizing non-electroplated algae reefs There are two modes for the timing of energization.

The first aspect is a non-electroplated algae reef.

This type of algae reef is simply installed in the sea, and unlike electrodeposited algae reefs, it does not require electricity, and seaweed spores naturally attach to its surface and grow to form an algae reef.

After several years have passed, miscellaneous seaweeds will grow together with useful seaweeds such as kelp, kashime, wakame, etc., and as a result, it becomes difficult for the spores of useful seaweeds to settle. A DC anode current is passed through the algae reef from a power source, creating an oxidizing atmosphere on the surface of the conductive material. This atmosphere is formed on the surface of the algae reef, thereby cleaning the surface of the algae reef and causing attached seaweed and miscellaneous seaweed to fall off. As a result, the surface of the algae reef becomes susceptible to the attachment of useful seaweed spores again.

Note that in the case of this non-electrodeposited algae reef, it is not necessary to energize it initially, but cables and the like are arranged in advance so that it can be energized later as an anode in order to carry out the present invention.

(3) Timing of energizing the electrolyte reef The second aspect is the application of electricity to the electrodeposited algae reef.

First, a seaweed reef made of a conductive material is placed in the sea, an anode is placed near it, and electricity is applied to the algae reef side as a cathode to cause electrodeposit to adhere to its surface. This electrodeposited material has the property that spores of useful seaweeds can easily settle thereon, and useful seaweeds can be propagated at a fairly early stage.

As in the case of the non-electrodeposited algae reef, when it becomes difficult for spores of useful seaweed to adhere, the surface of the algae reef is cleaned by applying a direct current to the algae reef side using the anode as the anode. become

When this electricity is applied, some or all of the miscellaneous seaweeds and useful seaweeds that have adhered to the surface of the algae reef will disappear at the same time as the electrodeposition on the surface, but the state will be such that useful seaweeds will be able to settle again. Therefore, there is no problem.

(4) Spot energization While electricity is being applied with the algae reef side as the anode, the surrounding atmosphere is an oxidizing atmosphere, so seaweed does not grow.

Therefore, the algae reef is not energized all the time, but is energized as needed. Since this energization can be carried out in spots, it is possible to efficiently manage a wide range of fishing grounds even if the fishing boat is equipped with small-capacity power generation equipment. In addition, since energization can be performed intermittently, power can be supplied from fishing boats and the like in a piecemeal manner according to weather and sea conditions.

〔Effect of the invention〕

The gist of the present invention is to apply an anode current in a state where seaweed is already growing, but its breeding ability is reduced, or unnecessary seaweed is growing,
The following effects can be achieved.

(1) The surface of the algae reef can be cleaned by applying electricity.

This cleaning with sterilization of the anode causes the undesired seaweed to fall off or disappear, reviving the surface of the algae reef, and forming a base for the reproduction of useful seaweed, thereby maximizing the ability of the algae reef. I can do it.

(2) Fishing grounds can be managed efficiently.

The end of the cable connected to the algae reef or the inductive edge connected to this cable is floated above the water surface of the fishing ground (by which, if necessary, an anodic current is applied to the algae reef in spots to strengthen the algae reef). can be regenerated and the fishing grounds can be managed efficiently.

In particular, since it is only necessary to energize the algae reefs from time to time, a large fishing ground can be managed by sequentially energizing a large number of algae reefs in a sea area using small fishing boats.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the method for creating an algae reef according to an embodiment of the present invention, Fig. 2 is a graph showing the relationship between the anode reaction amount and seawater pH, and Fig. 3 is a graph showing the pH change at the anode interface. be. 1... Seabed 2... Algae reef 3... Existing algae reef 4... Vessel 5... DC power supply
6... Cable.

Claims (1)

[Claims] 1. Connecting an anode to a seaweed reef made of a conductive material installed in the sea and applying electricity to cleanse the surface of the seaweed reef by peeling off marine organisms attached to the surface. A method for creating algae reefs characterized by: 2. Using a structure made of conductive material installed underwater as a cathode, an anode is placed near the cathode, and a direct current is passed between the two electrodes to form electrodeposit on the surface of the structure. , seaweed is allowed to grow on the electrodeposited material, and then electricity is applied to the structure side as an anode to dissolve the electrodeposited material and restore the surface to the original state of the conductive material, and then this is used again as a cathode. A method for creating an algae reef, characterized by forming an algae reef.