Laver net acid treatment ship

Abstract

To provide a laver cultivation acid-treatment ship (submerged ship) capable of efficiently performing a high salinity acid treatment in laver cultivation.SOLUTION: In the laver cultivation acid-treatment ship (submerged ship), a salt-accommodating housing 94 for accommodating solid salts S having an outflow hole 94a on a bottom surface portion and / or a side surface portion is provided, an acid-treatment liquid supplying portion 95 connected to the circulating portion 60 and configured to supply the acid-treatment liquid 31 from the circulating portion 60 to the salt-accommodating housing 94 is disposed in the salt-accommodating housing 94, a high-salt concentration acid-treatment liquid supplying mechanism configured to supply the acid-treatment liquid 31 sent from the acid-treatment liquid supplying portion 95 to the solid salts S in the salt-accommodating housing 94 to dissolve the solid salts S and cause the acid-treatment liquid 31s having a high-salt concentration higher than that of the laver cultivation sea area to flow out from the outflow hole 94a of the salt-accommodating housing 94 and return to the acid-treatment liquid storage tank 39 is provided, and a salt concentration control portion 90 configured to detect the salt concentration of the acid-treatment liquid 31 in the acid-treatment liquid storage tank 39 and control the amount of the acid-treatment liquid 31 supplied to the salt-accommodating housing 94 based on the detected value to obtain a constant high-salt concentration is provided.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an acid treatment ship (so-called diving ship) for a cultured laver net, which guides the cultured laver net onto the ship from the bow side and acid-treats fungi such as diatoms and red rot bacteria attached to the laver net during cultivation by allowing an acid treatment agent (liquid) to penetrate under the laver net. In particular, it relates to a diving ship suitable for high-salt acid treatment of cultured laver.

Background Art

[0002] Conventionally, in laver farms, acid treatment ships for laver nets that effectively perform acid treatment on fungi such as diatoms and red rot bacteria attached to the laver nets spread on the sea surface with an acid treatment agent having a compound composition consisting of a combination of organic acids such as lactic acid, citric acid, and malic acid are known in many types and structures.

[0003] As such an acid treatment ship for laver nets, a laver net guide for guiding the laver net onto the ship is provided on the upper part of the hull, and the acid treatment of the laver net is performed by diving under the laver net (see, for example, Patent Documents 1, 2, and 3). The laver net guide extends from the front end of the hull to the central part in the front-rear direction while being inclined upward, and extends substantially horizontally from the central part to the rear end of the hull, and has a structure in which the rear end is inclined downward to return the laver net to the sea. An acid treatment tank for performing acid treatment is provided at a portion extending from the central part in the front-rear direction to the rear end.

[0004] Also, it has been conventionally known that an acid treatment liquid obtained by adding salts such as salt to the acid treatment liquid for cultured laver to make it highly saline can effectively control diseases such as diatoms and red rot bacteria attached to the laver net in a shorter time than an acid treatment liquid without added salt, and high-salt acid treatment is an industrially effective treatment technique for laver cultivation (see, for example, Patent Document 4). However, in order to obtain a disease control effect while suppressing the adverse effects on nori cells in high-salt acid treatment, it is necessary to adjust both the salt concentration and the acid treatment agent concentration to appropriate conditions and perform stable treatment operations. Conventional submarines such as those disclosed in Patent Document 1 do not have a mechanism that fully satisfies this requirement, and there has been a problem that it is difficult to effectively utilize high-salt acid treatment.

[0005] As a nori cultivation acid treatment ship having a salt adjustment mechanism, there is Patent Document 5, which is a box-shaped ship provided with at least a pair of winding rolls for winding a nori net to which nori is attached in the front-rear direction. The scale of salt use reflected in the treatment mechanism for the cultivated nori net and the capacity of the treatment liquid tank is completely different from that of the submarine targeted by the present invention, and the requirements for industrial use are also different. That is, in the submarine for nori cultivation acid treatment, the amount (total weight) of salt loaded during treatment may exceed 1 ton. In order to effectively achieve high-salt acid treatment, it is important to perform treatment running while maintaining a stable weight balance and perform efficient treatment of the submarine for the nori cultivation net. Furthermore, the difficulty of adjusting and controlling both the salt concentration and the acid treatment agent concentration to appropriate conditions, such as the pH value detected by a pH device generally used for concentration adjustment control of the acid treatment liquid being affected by the salt concentration of the treatment liquid, has also been an issue in utilizing the high-salt acid treatment technology in a nori cultivation acid treatment submarine.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Summary of the Invention

Problems to be Solved by the Invention

[0007] The conventional laver aquaculture acid treatment ship (diving ship) with the above-described configuration does not have an automatic concentration adjustment mechanism for high-salt acid treatment, and it has not been possible to achieve treatment under stable and appropriate conditions for both the acid treatment agent concentration and the salt concentration.

[0008] Acid treatment liquids used for laver aquaculture are commercially available acid treatment agents composed of food and food additive components such as organic acids such as amino acids, lactic acid, and citric acid. This commercially available acid treatment agent is diluted with seawater or the like using the undiluted solution (hereinafter simply referred to as "acid undiluted solution"). This acid treatment liquid is expected to have an acid treatment effect that promotes the growth of laver by sterilization and nutrient provision. However, an acid treatment liquid (high-salt acid treatment liquid) obtained by adding salt to this acid treatment liquid to have a higher salt concentration than normal seawater has an even higher acid treatment effect. However, in order to exhibit this effect, it is necessary for the aquaculture laver net to contact the treatment liquid with appropriate acid treatment agent concentration (concentration threshold recommended for each type of commercially available agent) and salt concentration (described later) under sufficient conditions (amount of contact, strength, time, etc.). However, the current situation is that the conventional laver aquaculture acid treatment ship (diving ship) does not satisfy this condition.

[0009] In order to fully exhibit the performance of this high-salt acid treatment liquid, it is urgent to develop a laver aquaculture acid treatment ship that can reproduce (1) efficient circulation of the high-salt acid treatment liquid for maintaining an appropriate concentration stably, (2) sufficient contact between the aquaculture laver net and the high-salt acid treatment liquid, and (3) good operability of the high-salt acid treatment work.

[0010] The present invention aims to solve the above-mentioned conventional problems. In an acid treatment ship (diving ship) for seaweed nets that controls the concentration of fungi such as diatoms and red rot bacteria adhering to the seaweed nets during seaweed cultivation by acid treatment with an acid treatment agent (liquid) using an automatic concentration adjustment mechanism, the seaweed nets can be treated with a high-salt acid treatment liquid at a stable and appropriate acid treatment liquid and salt concentration, and a stable treatment operation run can be achieved with sufficient contact with the seaweed nets. Therefore, an object of the present invention is to provide an acid treatment ship for seaweed nets that can fully exhibit the performance of the high-salt acid treatment liquid.

Means for Solving the Problems

[0011] As a result of intensive studies on the above-mentioned conventional problems, the present inventors have found that at least a guide for seaweed nets that guides the seaweed nets from the bow side onto the ship and returns them to the sea from the stern, an acid treatment tank that brings the seaweed nets moving along the guide for seaweed nets into contact with the acid treatment liquid, a circulation section composed of the acid treatment tank, a path for supplying the acid treatment liquid to the acid treatment tank, a path for recovering the acid treatment liquid after contacting the seaweed nets from the acid treatment tank, and an acid treatment liquid storage tank to which both paths are connected, and a control section that detects the pH value of the acid treatment liquid in the acid treatment storage tank and operates an acid stock solution supply device that supplies the acid stock solution of the acid treatment liquid into the acid treatment liquid storage tank based on the detected value to control the acid treatment liquid to a constant pH value. In a seaweed cultivation acid treatment ship, a salt storage housing that contains solid salt and has outflow holes at least on the bottom surface and / or side surface is connected to the circulation section. The acid treatment liquid is supplied to the solid salt in the salt storage housing, and the acid treatment liquid with a high salt concentration returns to the acid treatment liquid storage tank. Based on the detected value of the salt concentration in the acid treatment storage tank, a salt control section that controls the supply amount of the acid treatment liquid to the salt storage housing to a constant high salt concentration is provided. Thus, the flow of the acid treatment liquid matches the automatic concentration adjustment function, and the circulation of the acid treatment liquid in the seaweed cultivation acid treatment ship (as a whole) becomes smooth. Moreover, a stable operability without the up-and-down, left-and-right shaking during the treatment run is obtained, so it has been clarified that a uniform and effective treatment can be achieved, and the present invention has been completed.

[0012] That is, it exists in the following (1) to (4). (1) At least, a guide for seaweed net that guides the seaweed net from the bow side onto the ship and returns it to the sea from the stern, an acid treatment tank that brings the seaweed net moving along the guide for seaweed net into contact with an acid treatment liquid, a circulation section composed of the acid treatment tank, a path for supplying the acid treatment liquid to the acid treatment tank, a path for recovering the acid treatment liquid after contacting the seaweed net from the acid treatment tank, and an acid treatment liquid storage tank to which both paths are connected, and a control section that detects the pH value of the acid treatment liquid in the acid treatment storage tank and operates an acid stock solution supply device that supplies an acid stock solution of the acid treatment liquid into the acid treatment liquid storage tank based on the detected value to control the acid treatment liquid to a constant pH value. The seaweed cultivation acid treatment ship is provided with a salt storage housing that stores solid salt and has outflow holes at least on the bottom surface and / or side surface. An acid treatment liquid supply section that is connected to the circulation section and supplies the acid treatment liquid from the circulation section to the salt storage housing is arranged in the salt storage housing. The acid treatment liquid sent from the acid treatment liquid supply section is supplied to the solid salt in the salt storage housing, so that the solid salt dissolves and the acid treatment liquid with a high salt concentration higher than that of the seaweed cultivation sea area flows out from the outflow holes of the salt storage housing and returns to the acid treatment liquid storage tank. A salt control section is provided that detects the salt concentration of the acid treatment liquid in the acid treatment storage tank and controls the supply amount of the acid treatment liquid supplied to the salt storage housing based on the detected value to make it a constant high salt concentration. (2) The seaweed cultivation acid treatment ship according to (1) above, characterized in that the particle size of the solid salt is an average particle size of 1 mm or more. (3) The seaweed cultivation acid treatment ship according to (1) or (2) above, characterized in that the acid treatment liquid supply section is provided at the upper peripheral edge of the salt storage housing. (4) The seaweed cultivation acid treatment ship according to (1) or (2) above, characterized in that the acid treatment liquid supply section is a tubular member having a plurality of discharge holes provided above the salt storage housing. (5) The seaweed cultivation acid treatment ship according to (1) or (2) above, characterized in that the acid treatment liquid supply section is provided inside the solid salt of the salt storage housing. (6) The seaweed cultivation acid treatment ship according to (1) or (2) above, characterized in that the side surface outflow holes of the salt storage housing are located at a height of 10 to 60 mm from the bottom surface. (7) The salt storage housing is provided at a position in front of the center of the hull, and the laver cultivation acid treatment ship according to the above (1) or (2) is characterized by this.

Advantages of the Invention

[0013] According to the invention of claim 1, the acid treatment liquid of the circulation part is supplied to the salt storage housing that stores solid salt and has outflow holes at least on the bottom surface and / or side surface, so that it becomes high salinity. By detecting the salt concentration of the acid treatment liquid and controlling the supply amount of the acid treatment liquid to obtain a high-salinity acid treatment liquid with a constant concentration, the flow of the acid treatment liquid matches the automatic concentration adjustment function, and the circulation of the acid treatment liquid in the laver cultivation acid treatment ship (as a whole) becomes smooth. Since stable operability without the up-and-down, left-and-right shaking during the laver net treatment is obtained, a laver cultivation acid treatment ship that achieves uniform and effective treatment is provided. According to the invention of claim 2, by providing a high-salinity acid treatment control mechanism and making the average particle size of the solid salt in the salt storage housing 1 mm or more, a uniform acid treatment liquid due to the smooth circulation of the acid treatment liquid in the laver cultivation acid treatment ship (as a whole) can be stably obtained. Also, the dissolution condition of the solid salt becomes appropriate, and a laver cultivation acid treatment ship that can achieve efficient contact between the high-salinity acid treatment liquid with an appropriate concentration and the laver net is provided. According to the invention of claim 3, by providing the acid treatment liquid supply part at the upper peripheral edge of the salt storage housing, the dissolution of the solid salt becomes efficient, and a laver cultivation acid treatment ship that can further sufficiently achieve contact between the high-salinity acid treatment with an appropriate concentration and the laver net is provided. According to the invention of claim 4, by making the acid treatment liquid supply part a tubular member having a plurality of discharge holes provided above the salt storage housing, the dissolution of the solid salt becomes efficient, and a laver cultivation acid treatment ship that can achieve efficient contact between the high-salinity acid treatment with an appropriate concentration and the laver net is provided. According to the invention of claim 5, by providing the acid treatment liquid supply part inside the solid salt of the salt storage housing, the dissolution of the solid salt becomes efficient, and a laver cultivation net acid treatment ship that can achieve efficient contact between the high-salinity acid treatment with an appropriate concentration and the laver net is provided. According to the invention of claim 6, by providing the side surface outflow hole of the salt-containing housing at a position where the height from the bottom surface is 10 to 60 mm, the dissolution of solid salt becomes efficient, and an acid treatment ship for seaweed cultivation nets capable of achieving efficient contact between the high-salt acid treatment of appropriate concentration and the seaweed nets is provided. According to the invention of claim 7, by providing the salt-containing housing at a position in front of the center of the hull, the flow of the acid treatment liquid matches the automatic concentration adjustment function, and the circulation of the acid treatment liquid in the seaweed cultivation acid treatment ship (as a whole) becomes smooth. Since a stable operability without the up-and-down, left-and-right sway during the running when treating the seaweed nets is obtained, a seaweed cultivation acid treatment ship capable of achieving uniform and effective treatment is provided.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0015] Hereinafter, each embodiment of the present invention will be described in detail. FIG. 1 is a drawing of a seaweed cultivation acid treatment ship showing the first embodiment of the present invention, and it is a schematic side view. As shown in Fig. 1, the laver cultivation acid treatment ship A of this first embodiment includes, at least, a guide 20 for laver nets on the ship body 10 that guides a cultivation laver net (not shown) onto the ship from the bow side and returns it to the sea from the stern, an acid treatment tank 35 that brings the laver net moving along the guide 20 for laver nets into contact with the acid treatment liquid 31, a circulation section 60 composed of a path that supplies the acid treatment tank 35 and the acid treatment liquid 31 to the stern side of the acid treatment tank 35, a path that recovers the acid treatment liquid 31 after it has contacted the laver net from the bow side of the acid treatment tank 35, and an acid treatment liquid storage tank 39 to which the two paths are connected respectively, and a control section 50 that detects the pH value of the acid treatment liquid in the acid treatment liquid storage tank 39 and operates an acid stock solution supply device 40 that supplies the acid stock solution Z of the acid treatment liquid 31 into the acid treatment liquid storage tank 39 based on the detected value to control the acid treatment liquid 31 to a constant pH value. An acid treatment liquid supply section 95 is connected and arranged on the bottom surface portion where the acid treatment liquid 31 from the circulation section 60 is supplied, and in a salt storage housing 94 that houses a solid salt S having an outflow hole 94a, the acid treatment liquid 31 sent from the acid treatment liquid supply section 95 is supplied to the solid salt S in the salt storage housing 94, so that the solid salt S dissolves and the acid treatment liquid 31s having a high salt concentration higher than that of the laver cultivation sea area flows out from the outflow hole 94a of the salt storage housing 94 and returns to the acid treatment liquid storage tank 39. A salt concentration control section 90 is provided that detects the salt concentration of the acid treatment liquid 31 in the acid treatment storage tank 39 and controls the supply amount of the acid treatment liquid 31 supplied to the salt storage housing 94 based on the detected value to a constant high salt concentration. A crew member seated in the steering seat 12 operates a steering handle (not shown), a thrust adjustment lever (not shown), and a side thruster adjustment lever (not shown) to adjust the running with the side thruster 80 at the bow bottom of the ship, and uses the propulsion force of the outboard motor 11 to make the front guide 20 for the laver net dive under the laver net and enter under the laver net to perform acid treatment on the laver net. The acid treatment is carried out for the purpose of sterilizing the laver net and imparting nutrients, and as is well known in the art, it is carried out by bringing the laver net into contact with the acid treatment liquid 31.

[0016] The outboard motor 11 is attached to the stern of the ship body 10 and is used not only during the normal navigation of the acid-treated ship A by the operation of the crew sitting in the steering seat 12, but also to generate thrust when performing acid treatment.

[0017] The seaweed net guide 20 provided on the ship body 10 is composed of members such as metal pipes, and includes a front guide 21 that can move freely in the front-rear direction at the front of the ship body 10, an upper guide 22 fixed to the upper part of the ship body 10, and a rear guide 23 fixed to the rear part of the ship body 10.

[0018] The front guide 21 is formed so that its width gradually narrows toward the front (bow) (for example, the planar shape is formed in a U shape or a V shape), and the rear end is slidably supported by a guide rod (not shown) on the side of the hull. The seaweed net acid treatment ship A in FIG. 1 is an example when having a front guide 21 formed in a V shape. When the acid treatment is not carried out, this front guide 21 is pulled up onto the ship. When the above operation is carried out, it is projected forward (bow) of the hull 10 and the tip is submerged in the sea. By advancing toward the seaweed net in this state, the seaweed net is pulled up onto the front guide 21 and transferred from the front guide 21 onto the upper guide 22. By further advancing the hull 10, the whole ship will dive under the seaweed net. While passing under the seaweed net in this way, the acid treatment of the seaweed net is carried out.

[0019] The upper guide 22 is formed by inclining two members such as metal pipes at both ends in the left-right direction from the front end to the rear end of the ship body 10 in a straight line and rising backward, and the rear end is bent in a U shape on the side and the lower end is fixed to the transom (not shown). The seaweed net moves along this upper guide 22 from the front part (bow) to the rear part (stern) of the hull.

[0020] The rear guide 23 is formed by a member such as a metal pipe protruding rearward from the rear end of the ship body 10. The total length of the rear guide 23 is set to a length that can keep the laver net moving from the upper guide 22 floating in the air for a time sufficient to apply a sufficient acid treatment effect while the laver net moves to the rear end of the rear guide 23 as the ship advances. After passing through this rear guide 23, the laver net returns to the aquaculture sea area (underwater), and the acid treatment of the laver net is carried out.

[0021] The acid treatment liquid 31 is a dilution of an acid stock solution such as an organic acid such as lactic acid, citric acid, and malic acid [if there is a commercially available product, a commercially available acid treatment agent (liquid), in this embodiment, "Nori Act" manufactured by Daiichi Nets Co., Ltd.] Z with seawater or the like, and is an acid dilution liquid having a predetermined pH value, for example, pH 1.7 to 2.3. A certain amount (500 to 2,000 L) of this acid treatment liquid 31 is stored in the acid treatment liquid storage tank 39, and it acid-treats the laver net and the laver attached to the laver net by contacting the laver net pulled onto the ship. In addition, this acid treatment liquid 31 is expected to have an acid treatment effect of promoting the growth of laver by sterilization and nutrient application. In order to exhibit this effect, the laver net needs to contact the acid treatment liquid within an appropriate concentration range (the concentration threshold recommended for each type of commercially available agent, for example, diluting the acid treatment agent to 0.9 to 1%) under sufficient conditions (amount of contact, strength, time, etc.).

[0022] The salt concentration applied to the high-salt acid treatment for the purpose of enhancing the acid treatment effect by the laver aquaculture acid treatment ship of the present invention is appropriately set according to the cell state of the cultured laver, the type and degree of the target disease, etc. For example, it is often used at a salt concentration 2 to 8% higher than that of the laver aquaculture sea area. And the pH value of the acid treatment liquid detected by the pH detector 51 is affected by the salt concentration. As the salt concentration increases, the measured pH value tends to decrease even at the same hydrogen ion concentration depending on it. Therefore, when performing high-salt acid treatment, it is necessary to set and adjust the aforementioned predetermined pH value according to this tendency.

[0023] The solid salt S used in the Nori cultivation acid treatment vessel of the present invention can be any granular or lump-shaped salt obtained by drying seawater containing sodium chloride as the main component or by mining rock salt. Examples of salts made from seawater include special grade salt, table salt, regular salt, and white salt. The particle size of the solid salt S used in the Nori cultivation acid treatment vessel of the present invention (the longer diameter in the case of non-spherical particles) can be various, but the appropriate particle size of the solid salt is preferably a relatively large one with an average particle size of 1 mm or more. If the average particle size is less than 1 mm, the solid salt S will dissolve too much depending on the seawater temperature (for example, at about 18°C, which is relatively high for Nori cultivation), which makes it easy for the concentration control of the high-salinity acid treatment to vary. More preferably, the solid salt should be one in which 60% or more of the particles have a particle size of 1 mm or more ("60% or more of the particles are 1 mm or more"). Examples of solid salt S with such particle sizes include coarse salt, rock salt, and granulated salt. If solid salt S of such a particle size is used in the seaweed cultivation acid treatment vessel of the present invention, there is an advantage that the solubility due to the particle size and the flow of the acid treatment liquid in the salt storage case 94 due to the gaps between the solid salts S become good, and it becomes easier to control the concentration of the high-salinity acid treatment. In addition, when storing the solid salt S in the salt storage case 94, it is preferable to use it in a mesh cloth bag 96 with openings smaller than the particle size of the solid salt S, since there is no loss of the solid salt S due to leakage.

[0024] The acid treatment liquid storage tank 39 is a rectangular tank formed in the middle of the vessel body 10, and stores a predetermined amount (500 to 2,000 L) of the acid treatment liquid 31. The acid treatment liquid storage tank 39 is provided with an acid concentrate supply device 40, a control unit 50, an acid treatment liquid supply pump 32, and a battery (not shown) for driving these devices. The acid treatment liquid storage tank 39 is also provided with a salt storage case 94, a salinity control unit 90, an acid treatment liquid supply adjustment device 92 (a submersible pump in the Nori cultivation acid treatment vessel A of the first embodiment shown in FIG. 1), and a battery (not shown) for driving these devices, as a high-salt concentration acid treatment supply mechanism that is a feature of the Nori cultivation acid treatment vessel of the present invention.

[0025] As shown in Fig. 1, the acid stock solution supply device 40 is arranged at an appropriate position in the acid treatment liquid storage tank 39 and supplies the acid stock solution Z of the acid treatment liquid 31 into the acid treatment liquid storage tank 39. In this embodiment, the acid stock solution supply device 40 includes an acid stock solution tank 41 for storing the acid stock solution Z of the acid treatment liquid 31, which is connected from the acid stock solution tank 41 to the acid stock solution line 43 via an acid stock solution pump 42.

[0026] As shown in Fig. 1, the salt storage housing 94 is appropriately arranged at a height position above the position of the acid treatment liquid storage tank 39 and supplies the high-salt concentration acid treatment liquid 31s into the acid treatment liquid storage tank 39. In this embodiment, the salt storage housing 94 is provided with a tubular acid treatment liquid supply part 95 having a plurality of discharge holes for supplying the acid treatment liquid 31 from the acid treatment liquid storage tank 39 to the salt storage housing 94 above. The solid salt S is dissolved by the acid treatment liquid 31 evenly sprayed on the entire upper surface of the solid salt S, and the acid treatment liquid 31s with a high salt concentration higher than that of the seaweed cultivation sea area flows out from the outflow hole 94a and returns to the acid treatment liquid storage tank 39, which is a high-salt concentration acid treatment liquid supply mechanism. The size of the salt storage housing 94 for storing the solid salt S is provided according to the size of the seaweed cultivation acid treatment ship (hull 10) and the acid treatment liquid storage tank, etc., but it is about 80 - 400 × 50 - 250 × 40 - 120 cm, and the storage capacity of the solid salt is about 30 - 2,000 kg. Also, the amount of solid salt loaded on the seaweed cultivation acid treatment ship (the total inside and outside the salt storage housing) is very large, about 1,000 - 3,000 kg, depending on the load allowance of the seaweed cultivation acid treatment ship, etc., and it has a great impact on the running during treatment due to the hull balance. Therefore, the salt storage housing 94 is preferably provided at a position in front of the center of the ship body 10.

[0027] The control unit 50 has a pH detector 51 that detects the pH value of the acid treatment liquid 31 at an appropriate position within the acid treatment liquid storage tank 39 (an appropriate position where the average pH of the acid treatment liquid storage tank 39 can be detected). Based on the detected value detected by the pH detector 51, the acid stock solution pump 42 of the acid stock solution supply device 40 is operated to supply the acid stock solution Z of the acid treatment liquid 31 into the acid treatment liquid storage tank 39 to control the acid treatment liquid 31 to a constant pH value. The control unit 50 automatically adjusts the supply amount of the acid stock solution Z to be supplied based on the detected value of the pH detector 51.

[0028] The salt content control unit 90 has a salt content detector 91 that detects the salt content concentration of the acid treatment liquid 31 at an appropriate position within the acid treatment liquid storage tank 39 (an appropriate position where the average salt content of the acid treatment liquid storage tank 39 can be detected). Based on the detected value detected by the salt content detector 91, the acid treatment liquid supply adjustment device 92 is operated, and through the salt storage housing 94, the high-salt concentration acid treatment liquid 31s is supplied into the acid treatment liquid storage tank 39 to control the acid treatment liquid 31 to a constant salt content concentration. The salt content control unit 90 automatically adjusts the supply amount of the acid treatment liquid 31 from the circulation unit 60 to the salt storage housing 94 by the acid treatment liquid supply adjustment device 92 based on the detected value of the salt content detector 91.

[0029] The acid treatment liquid supply adjustment device 92 supplies the acid treatment liquid 31 in the circulation section 60 to the acid treatment liquid supply section 95 of the salt storage housing 94. In the laver cultivation acid treatment ship A (Fig. 1) of the first embodiment, it is a submersible pump that pumps up the acid treatment liquid in the treatment liquid storage tank. Other examples include a solenoid valve that creates a flow of the acid treatment liquid from the path that recovers the acid treatment liquid after it contacts the laver net from the acid treatment tank. The salt control section 90 is connected to the acid treatment liquid supply adjustment device 92. The salt concentration of the acid treatment liquid 31 in the acid treatment storage tank 39 is detected by the salt detector 91, and based on the detected value, the supply amount of the acid treatment liquid 31 supplied to the salt storage housing 94 is controlled (in the case of a submersible pump, by flow rate or operation time ON / OFF, and in the case of a solenoid valve, by path adjustment). That is, in the laver cultivation acid treatment ship A (Fig. 1) of the first embodiment, when the detected value of the salt detector 91 becomes lower than the salt concentration set by the salt control section 90, the submersible pump operates, and the acid treatment liquid 31 flows from the circulation section 60 (acid treatment liquid storage tank 39) into the salt storage housing 94 via the acid treatment liquid supply path 93. As a result, the high-salt concentration acid treatment liquid 31s returns to the acid treatment liquid storage tank 39, and when the set salt concentration is reached, the operation of the submersible pump stops.

[0030] In the laver cultivation acid treatment ship A (Fig. 1) of the first embodiment, the acid treatment liquid supply section 95 of the salt storage housing 94 is provided at the upper part of the salt storage housing 94 so as to be a tubular member having a plurality of discharge holes 95a. By doing so, the acid treatment liquid 31 is supplied from the acid treatment liquid supply section 95 to the upper surface of the solid salt S in a shower-like manner from above, and comes into uniform contact with the solid salt S, so that the solid salt S dissolves efficiently. This is preferable for the high-salt concentration acid treatment liquid supply mechanism of the laver cultivation acid treatment ship of the present invention.

[0031] In the laver cultivation acid treatment ship A (FIG. 1) of the first embodiment, a plurality of fine outflow holes 94a are provided over the entire bottom surface of the salt storage housing 94. By doing so, the high-salt concentration acid treatment liquid 31s is supplied from the salt storage housing 94 to the upper surface opening of the acid treatment liquid storage tank 39 in a shower form, and widely contacts the acid treatment liquid 31 in the acid treatment liquid storage tank 39. As a result, the high-salt concentration acid treatment liquid 31s and the acid treatment liquid 31 are efficiently mixed, which is preferable for the high-salt concentration acid treatment liquid supply mechanism of the laver cultivation acid treatment ship of the present invention.

[0032] As described above, the pH value of the acid treatment liquid detected by the pH detector 51 is affected by the salt concentration. That is, the higher the salt concentration, the lower the measured pH value even at the same hydrogen ion concentration depending on it, which will affect the control of the high-salt acid treatment. Therefore, in order to appropriately control both the acid treatment agent and the salt to the desired concentration, it is necessary to provide the pH detector 51 (measurement of hydrogen ion concentration by the glass electrode method) and the salt detector 91 (measurement of conductivity by the electrical conductivity method) in an appropriate positional relationship. Due to the physical and electrical conditions of the members, regarding the installation of both detectors, the height position (lower tip of the detector) is preferably separated from the bottom of the acid treatment liquid storage tank by 5 cm to 50 cm upward, and the difference in the lower tip between the two detectors is within 30 cm, and the horizontal position is preferably provided within a range where the difference between the two detectors is within 50 cm. Further, it is more preferable that the difference in the lower tip height between the two detectors is 10 to 20 cm, and the difference in the horizontal position is within the range of 10 to 30 cm. In addition, it is preferable that both detectors are provided at a position at least 1 m or more away from each supply port of the acid stock solution Z and the high-salt concentration acid treatment liquid 31s.

[0033] The side thruster 80 is a pump type, propeller type, etc. installed on the bottom of the bow and stern of the ship's hull 10, and controls and suppresses the vertical and lateral running vibrations during the seaweed net treatment. The hydraulic motor 81 rotates by the hydraulic pressure via the hydraulic linkage pipe 83 sent out from the hydraulic device 82, and in response to this, the pump water flow or the propeller operates. In the seaweed cultivation acid treatment ship, it is a device that can flexibly control and suppress the vertical and lateral running vibrations during the seaweed net treatment by adjusting the pump water flow rate, the rotation speed and direction of the propeller, etc. The adjustment control during its running is performed by an operator sitting in the steering seat 12 operating a side thruster adjustment lever (not shown). Further, the hydraulic device 82 is composed of a small engine (not shown) and a hydraulic pump (not shown).

[0034] The acid treatment tank 35 where the seaweed net comes into contact with the acid treatment liquid 31 and is subjected to acid treatment is formed in a shallow dish shape with a rectangular planar shape by fiber reinforced plastic or the like. In the seaweed cultivation acid treatment ship A (Fig. 1) of the first embodiment, it is supported by the upper guide 22 extending rearward and upward toward the stern and is inclined rearward and upward (forward and downward). The position where this acid treatment tank 35 is installed is, as shown in Fig. 1, approximately the central portion in the front-rear direction of the upper guide 22, and some front-rear adjustment is made according to the design of the seaweed cultivation acid treatment ship. The lateral width of this acid treatment tank 35 is formed between the two pipe-like members of the upper guide 22. The size, etc. of this acid treatment tank 35 vary depending on the scale of the seaweed cultivation farm, the size of the seaweed net, etc., but for example, it is about 480 - 640 × 180 - 250 × (depth) 4 - 10 cm, and in this embodiment, it is 520 - 580 × 200 - 240 × (depth) 4 - 7 cm. In addition, in the laver cultivation acid treatment ship A (Fig. 1) of the first embodiment, the inclination angle of the acid treatment tank 35 with respect to the ship body 10 (horizontal reference) is inclined downward at 1.2 degrees (or more) to 15 degrees (or less) so that the acid treatment liquid 31 in the acid treatment tank 35 flows properly (flow rate, intensity, stability) from the rear of the ship to the front of the ship in the operating (control) state of the side thruster 80. If the inclination angle is less than 1.2 degrees, the flow of the acid treatment liquid 31 from the rear of the ship to the front of the ship in the acid treatment tank 35 is weak (flow rate), and the interlock with the acid stock solution supply device 40 and the control unit 50, which is the automatic concentration adjustment function of the laver cultivation acid treatment ship, deteriorates (relatively, the flow rate of the acid treatment liquid 31 in the acid treatment tank 35 is insufficient), making it difficult to stabilize the concentration of the acid treatment liquid 31 in the entire laver cultivation acid treatment ship. As a result, the acid treatment of the laver net at an appropriate concentration cannot be performed. Also, if the inclination angle is less than 1.2 degrees, the flow of the acid treatment liquid 31 from the rear of the ship to the front of the ship in the acid treatment tank 35 is weak (insufficient) in terms of intensity and amount, and the acid treatment liquid 31 does not sufficiently penetrate the laver net and the laver attached to the laver net during contact, so the original effects (performance of disinfection and nutrient provision) of the acid treatment liquid 31 cannot be fully obtained. And when the inclination angle exceeds 15 degrees, the flow of the acid treatment liquid 31 from the rear of the ship to the front of the ship in the acid treatment tank 35 is too large, and the interlock with the acid stock solution supply device 40 and the control unit 50 deteriorates (relatively, the flow rate of the acid treatment liquid 31 in the acid treatment tank 35 becomes excessive). Also, since a part of the acid treatment liquid 31 spills out of the acid treatment tank 35 during contact with the laver net, as a result, the acid treatment of the laver net under the appropriate conditions (concentration, amount) of the acid treatment liquid 31 cannot be performed.

[0035] In the laver cultivation acid treatment ship A (Fig. 1) of the first embodiment, a tubular member 61 (nozzle) for supplying the acid treatment liquid 31 into the acid treatment tank 35 is formed at the upper end portion (rear end portion) of the acid treatment tank 35, and an acid treatment liquid recovery duct 36 (opening) for returning the acid treatment liquid 31 to the acid treatment liquid storage tank 39 below the ship body 10 is formed at the lower end portion (front end portion) of the acid treatment tank 35. Below this tubular member 61, that is, on the back side of the acid treatment tank 35, it is connected to an acid treatment liquid supply line 33 for supplying the acid treatment liquid 31 from the acid treatment liquid storage tank 39 to the tubular member 61 via the acid treatment liquid supply pump 32. Further, this acid treatment liquid recovery duct 36 is connected to an acid treatment liquid recovery line 37 for returning the acid treatment liquid 31 to the acid treatment liquid storage tank 39.

[0036] The tubular member 61 has a structure for supplying the acid treatment liquid 31 pressurized by the acid treatment liquid supply pump 32 from the upper end portion (rear end portion) of the acid treatment tank 35 forward of the bow. Preferably, a plurality of elongated discharge slits or discharge holes are arranged in a row at intervals so as to extend over substantially the entire width direction of the acid treatment tank 35. With such a setting, the acid treatment liquid 31 flows from the rear (stern) to the front (bow) of the acid treatment tank 35 evenly with respect to the width direction of the acid treatment tank 35. The laver net acid treatment ship A in Fig. 1 is an example in the case of having a plurality of discharge holes. The (total) discharge amount of the acid treatment liquid 31 to the acid treatment tank 35 by the tubular member 61 in this embodiment varies and is adjusted according to the laver leaf length, the amount of budding, and the degree of disease, but is about 10 to 20 L / second, and in this embodiment, it is 15 L / second. The pH control of the acid treatment liquid 31, the salt concentration control, the total discharge amount (L / second) to the acid treatment tank 35, the sway control of the side thruster 80, etc. can be controlled by an operator sitting in the steering seat 12 using a control unit arranged in the vicinity of the steering seat 12.

[0037] The circulation section 60 is a circulation line of the acid treatment liquid 31 in the laver cultivation acid treatment ship, which is composed of the above-mentioned "acid treatment liquid storage tank 39 - acid treatment liquid supply pump 32 - acid treatment liquid supply line 33 - tubular member 61 - acid treatment tank 35 - acid treatment liquid recovery duct 36 - acid treatment liquid recovery line 37 (returning to the acid treatment liquid storage tank 39)". And in the laver cultivation acid treatment ship A (Fig. 1) of the first embodiment, the acid treatment tank 35 has an inclination angle such that the acid treatment liquid 31 flows properly (flow rate, intensity) from the rear of the ship to the front of the ship, and is inclined downward. Therefore, the flow of the supply (tubular member 61) - recovery (acid treatment liquid recovery duct 36) of the acid treatment liquid 31 from the rear (stern) to the front (bow) in the acid treatment tank 35 matches the supply interlock of the acid stock solution Z of the acid stock solution supply device 40 and the control unit 50, which is the automatic concentration adjustment function of the acid treatment liquid 31 in the acid treatment storage tank 39. The circulation of the acid treatment liquid 31 in the laver cultivation acid treatment ship (a series of components of the circulation section 60) becomes smooth, and the concentration of the acid treatment liquid 31 can be stably maintained within a certain range desired by the laver cultivation acid treatment ship (as a whole). The thick arrow in Fig. 1 is an image of the circulation of the acid treatment liquid 31 in the laver cultivation acid treatment ship (as a whole). The path (supply port) for supplying the acid treatment liquid 31 connected to the inside of the acid treatment liquid storage tank 39 to the acid treatment tank 35 and the path (recovery port) for recovering from the acid treatment tank 35 are preferably provided separately near both side surfaces in the longitudinal direction of the hull of the acid treatment liquid storage tank 39 in order to achieve smooth circulation of the acid treatment liquid 31. Further, the supply ports of the acid stock solution Z and the high-salt concentration acid treatment liquid 31s are preferably provided near the recovery port of the acid treatment liquid storage tank 39 in order to achieve smooth circulation of the acid treatment liquid 31.

[0038] The high-salt content acid treatment operation of the laver net by the laver net acid treatment ship A (submersible ship) of the first embodiment configured as described above will be described below. After moving the laver net acid treatment ship A to the sea where the laver net being cultivated is installed, the ship When the main body 10 moves forward, as it moves forward, the laver net (not shown) is guided by the laver net guide 20 and enters the acid treatment tank 35 from the front. While flowing in the acid treatment tank 35, it comes into contact with the acid treatment liquid 31 adjusted to a high salt content (higher salt concentration than the laver cultivation sea area) and stored therein, and the laver is acid-treated.

[0039] Specifically, when the ship main body 10 is moved forward toward the laver net with the front guide 21 of the laver net guide 20 protruding forward while operating (controlling) the side thruster 80 by the propulsion force of the outboard motor 11, the ship main body 10 is in a state of diving under the laver net. The laver net is guided by the upper guide 22 and comes into contact with the acid treatment liquid 31 flowing from the rear of the stern to the front of the bow of the acid treatment tank 35, so that the laver net and the laver attached to the laver net are acid-treated. In this acid treatment, the acid treatment tank 35 is inclined downward at an inclination angle of 1.2 degrees (or more) to 15 degrees (or less) with respect to the ship main body 10 (horizontal reference), so that the laver net can come into contact with the acid treatment liquid 31 flowing appropriately (flow rate, strength) from the rear of the stern to the front of the bow. Also, from the tubular member 61 attached to the upper end portion (rear end portion) of the acid treatment tank 35, the high-salt acid treatment liquid 31 adjusted to a desired concentration from the acid treatment liquid storage tank 39 is pressurized and supplied by the acid treatment liquid supply pump 32 and discharged from a plurality of discharge holes of the tubular member 61 over substantially the entire width direction of the acid treatment tank 35, so that the acid treatment liquid 31 with an appropriate concentration can come into contact with the laver net evenly.

[0040] As described above, after contacting the laver net in the acid treatment tank 35, the acid treatment liquid 31 becomes a low-value state (fluctuating to a high value as pH) from the appropriate concentration due to the consumption of the active ingredient by the manifestation of the treatment effect and the addition of seawater from the aquaculture sea area brought in through the laver net. It is collected by the acid treatment liquid recovery duct 36 provided at the lower end (front end) of the acid treatment tank 35 and returns to the acid treatment liquid storage tank 39 through the acid treatment liquid recovery line 37. In the recovery of the acid treatment liquid 31 after the acid treatment, the acid treatment tank 35 is inclined forward downward at an inclination angle of 1.2 degrees (or more) to 15 degrees (or less) with respect to the ship body 10 (horizontal reference) while suppressing the sway with the side thruster 80. Therefore, the flow of the acid treatment liquid 31 becomes steady, and smooth recovery of the acid treatment liquid 31 becomes possible.

[0041] As described above, the acid treatment liquid 31 after acid treatment recovered in the acid treatment liquid storage tank 39 is mixed with the acid treatment liquid 31 already present in the acid treatment storage tank 39. Due to this mixing, the concentration of the acid treatment liquid 31 in the acid treatment liquid storage tank 39 temporarily deviates from the desired appropriate value. However, in the acid treatment liquid storage tank 39, the pH of the acid treatment liquid 31 is detected by the pH detector 51, and the detection value detected by this pH detector 51 is output to the control unit 50. The control unit 50 performs feedback control on the acid stock solution pump 42 of the acid stock solution supply device 40 based on the detection value input from the pH detector 51 and a preset control threshold value (a pH value corresponding to the desired appropriate concentration of the acid treatment liquid 31 and taking into account the influence of the desired appropriate high salt concentration). The acid stock solution pump 42 sucks out a predetermined amount of the acid stock solution Z from the acid stock solution tank 41 according to the operation signal input from the control unit 50 and supplies it to the acid treatment liquid storage tank 39 through the acid stock solution line 43. Also, the control unit 50 can automatically adjust the supply amount of the acid stock solution Z supplied to the acid treatment liquid 31 by controlling the acid stock solution pump 42 based on the detection value of the pH detector 51. And simultaneously with the above-described pH control, in the acid treatment liquid storage tank 39, the salt concentration of the acid treatment liquid 31 is detected by the salt detector 91, and the detection value detected by this salt detector 91 is output to the salt control unit 90. The salt control unit 90 performs feedback control on the acid treatment liquid supply adjustment device 92 (a water pump in FIG. 1) based on the detection value input from the salt detector 91 and a preset control threshold value (the desired appropriate salt concentration). The acid treatment liquid supply adjustment device 92 supplies a predetermined amount of the acid treatment liquid 31 corresponding to the operation signal from the salt control unit 90 from the circulation unit 60 (the acid treatment liquid storage tank 39 in FIG. 1) to the salt housing 94 through the acid treatment liquid supply path 93, thereby supplying the high salt concentration acid treatment liquid 31s due to the dissolution of the solid salt S to the acid treatment liquid storage tank 39. Also, the salt control unit 90 can automatically adjust the supply amount of the high salt concentration acid treatment liquid 31s supplied to the acid treatment liquid storage tank 39 by controlling the acid treatment liquid supply adjustment device 92 based on the detection value of the salt detector 91.With the smooth recovery flow of the acid treatment liquid 31 made possible for the first time at a predetermined inclination angle from the acid treatment tank 35, the acid treatment liquid 31 is in a good stirring state due to the backflow generated in the acid treatment liquid storage tank 39. As a result, the acid stock solution Z and the high-salt acid treatment liquid 31s dissolve and efficiently diffuse into the high-salt acid treatment liquid 31 (with a variable high value as pH) thinned by seawater or the like in the acid treatment. Thereby, the pH value that varies to a high value and the salt concentration that varies to a low value in the acid treatment liquid 31 can be quickly adjusted to the desired set pH value and salt concentration. The display of the pH value and the salt concentration can be confirmed by the crew at the steering station 12 on a waterproof pH and salt concentration display liquid crystal screen or the like (not shown) provided in the control unit 50 and the salt control unit 90. The smooth and steady recovery of the acid treatment liquid 31 from the acid treatment tank 35 described above, the resulting backflow of the high-salt acid treatment liquid 31 stably occurring in the acid treatment liquid storage tank 39, and the rapid pH adjustment and salt adjustment effects obtained from the efficient diffusion of the acid stock solution Z and the high-salt acid treatment liquid 31s are effectively achieved by inclining the inclination angle of the acid treatment tank 35 to a forward downward inclination of 1.2 degrees (or more) to 15 degrees (or less) while suppressing the sway during the treatment travel by the side thruster 80.

[0042] As described above, the high-salt acid treatment liquid 31 having the desired appropriate concentration in the acid treatment liquid storage tank 39 is pressurized and supplied from the tubular member 61 to the acid treatment tank 35 through the acid treatment liquid supply line by the acid treatment liquid supply pump 32, and the smooth circulation of the high-salt acid treatment liquid in the seaweed cultivation acid treatment ship (as a whole) unique to the present invention is completed. Further, the seaweed net that has come into contact with the high-salt acid treatment liquid 31 in the acid treatment tank 35 is guided to the rear guide 23, moves outside the ship body 10, and returns to the cultivation sea area (in water), thereby performing the acid treatment of the seaweed net.

[0043] According to the laver net acid treatment ship A of the first embodiment configured as described above, while suppressing the sway during the treatment travel with the propeller-type side thruster 80 equipped at the bow and bottom of the ship, the acid treatment liquid 31 in the acid treatment tank 35 is inclined downward at a front inclination angle of 1.2 degrees (or more) to 15 degrees (or less) so that the acid treatment liquid 31 flows forward of the bow. Therefore, the flow of the acid treatment liquid 31 from the rear (stern) to the front (bow) matches the automatic concentration adjustment function, and the circulation of the acid treatment liquid 31 in the laver cultivation acid treatment ship (as a whole) becomes smooth, and a laver net acid treatment ship capable of achieving uniform and effective treatment can be obtained. In addition, the laver net acid treatment ship A of the first embodiment exhibits its unique effect particularly in the treatment of columnar cultivation, but can also be appropriately used in the treatment of floating cultivation other than columnar cultivation. In addition, as a high-salt concentration acid treatment liquid supply mechanism for a laver cultivation acid treatment ship that performs high-salt acid treatment, a mechanism different from that of the present invention that supplies high-salt water in which solid salt is dissolved at a high concentration with seawater or the like by a pump or the like and controls the salt content to adjust the salt content concentration of the acid treatment liquid can be considered. However, such a separate mechanism does not smoothly circulate the acid treatment liquid (as a whole) in the laver cultivation acid treatment ship (submersible ship), and high-salt water different from the state (acid concentration, liquid temperature, etc.) of the acid treatment liquid in the circulation system that changes each time is supplied to the acid treatment liquid storage tank 39 in a mismatch. Therefore, it is impossible to achieve a uniform and effective high-salt acid treatment as obtained in the laver cultivation acid treatment ship of the present invention that connects the salt storage housing 94 containing the solid salt S to the circulation section 60 and supplies the high-salt concentration acid treatment liquid 31s prepared with the acid treatment liquid 31 in the circulation system to the acid treatment liquid storage tank 39.

[0044] FIG. 2 is a drawing of a laver cultivation acid treatment ship showing the second embodiment of the present invention, and is a schematic side view. In the following second embodiment to third embodiment, the same configuration as that of the first embodiment is denoted by the same reference numerals in the drawings, and the description thereof is omitted. The laver cultivation acid treatment ship B showing the second embodiment of the present invention, in the first embodiment, the acid treatment liquid supply adjustment device 92 that supplies the acid treatment liquid 31 in the circulation unit 60 to the acid treatment liquid supply unit 95 of the salt storage housing 94 is a solenoid valve provided at the outlet of the acid treatment liquid recovery duct 36. The acid treatment liquid 31 recovered by the acid treatment liquid recovery duct 36 is added to the flow returning to the acid treatment liquid storage tank 39 through the acid treatment liquid recovery line 37, and the flow supplied to the acid treatment liquid supply unit 95 of the salt storage housing 94 through the acid treatment liquid supply path 93 is created by adjusting the solenoid valve. A salinity control unit 90 is connected to this acid treatment liquid supply adjustment device 92 (solenoid valve). The salinity concentration of the acid treatment liquid 31 in the acid treatment storage tank 39 is detected by a salinity detector 91, and based on that value, the supply amount of the acid treatment liquid 31 supplied to the salt storage housing 94 is controlled (by adjusting the ratio of the two paths on the acid treatment liquid storage tank 39 side and the salt storage housing 94 side by the solenoid valve). That is, in the laver cultivation acid treatment ship B (Fig. 2) of this second embodiment, when the detection value of the salinity detector 91 becomes lower than the salinity concentration set by the salinity control unit 90, the path adjustment of the solenoid valve works, and more of the acid treatment liquid 31 from the circulation unit 60 (acid treatment liquid recovery duct 36) flows into the salt storage housing 94 through the acid treatment liquid supply path 93. As a result, when the high salinity concentration acid treatment liquid 31s returns to the acid treatment liquid storage tank 39 and reaches the set salinity concentration, the mechanism shifts in the direction of closing the path on the salt storage housing 94 side of the solenoid valve.

[0045] In the laver cultivation acid treatment ship B (Fig. 2) of this second embodiment, the acid treatment liquid supply unit 95 of the salt storage housing 94 is provided inside the solid salt S. By doing so, the acid treatment liquid 31 at the outlet of the acid treatment liquid supply unit 95 comes into contact with the solid salt S and flows in a wide direction inside the solid salt S, so that the solid salt S dissolves efficiently, which is preferable for the high salinity concentration acid treatment liquid supply mechanism of the laver cultivation acid treatment ship of the present invention.

[0046] According to the laver net aquaculture acid treatment ship B of the second embodiment configured as described above, since a mechanism is provided for connecting the salt storage housing 94 for storing the solid salt S to the circulation section 60 (acid treatment liquid recovery duct 36) and supplying the high-salt concentration acid treatment liquid 31s prepared with the acid treatment liquid 31 of the circulation system to the acid treatment liquid storage tank 39, the circulation of the acid treatment liquid (as a whole) in the laver aquaculture acid treatment ship (submersible ship) is smoothly performed, and the high-salt concentration acid treatment liquid 31s synchronized with the state of the acid treatment liquid in the circulation system (acid concentration, liquid temperature, etc.) that changes each time is supplied, so that a laver net acid treatment ship capable of achieving uniform and effective high-salt acid treatment can be obtained.

[0047] FIG. 3 is a drawing of a laver aquaculture acid treatment ship showing the third embodiment of the present invention, and is a schematic side view. In the laver aquaculture acid treatment ship C showing the third embodiment of the present invention, an acid treatment tank 35 is horizontally installed on the upper part of the ship body 10, and tubular members 61 having a plurality of discharge holes are respectively provided on both sides of the acid treatment tank 35 in the vertical direction so that the acid treatment liquid 31 is discharged over substantially the entire area of the acid treatment tank 35. A front-inclined plate surface is provided to receive the flow of the acid treatment liquid 31 accompanying the rearward movement of the laver net during treatment at a position behind the acid treatment tank 35 and flow it into the acid treatment liquid recovery duct 36. Further, in the laver aquaculture acid treatment ship C, the supply of the acid treatment liquid 31 from the acid treatment liquid storage tank 39 by the acid treatment liquid supply pump 32 to the acid treatment tank 35 is on the bow side (front), and the recovery from the acid treatment tank 35 is on the stern side (rear) as described above, and the flow of the circulation section 60 is in the opposite direction to that of the first embodiment (laver aquaculture acid treatment ship A, FIG. 1). According to the laver net aquaculture acid treatment ship C of the third embodiment, since a mechanism is provided for connecting the salt storage housing 94 for storing the solid salt S to the circulation section 60 (acid treatment liquid storage tank 39) and supplying the high-salt concentration acid treatment liquid 31s prepared with the acid treatment liquid 31 of the circulation system by an underwater pump to the acid treatment liquid storage tank 39, the circulation of the acid treatment liquid (as a whole) in the laver aquaculture acid treatment ship (submersible ship) is smoothly performed, and the high-salt concentration acid treatment liquid 31s synchronized with the state of the acid treatment liquid in the circulation system (acid concentration, liquid temperature, etc.) that changes each time is supplied to the acid treatment liquid storage tank 39, so that a laver net acid treatment ship capable of achieving uniform and effective high-salt acid treatment can be obtained.

[0048] In the laver cultivation acid treatment ship C (Fig. 3) of the third embodiment, the acid treatment liquid supply part 95 of the salt storage housing 94 is provided above the salt storage housing 94 so as to be a tubular member having a plurality of discharge holes 95a. By doing so, the acid treatment liquid 31 is supplied from the acid treatment liquid supply part 95 to the upper surface of the solid salt S in a shower-like manner, and comes into uniform contact with the solid salt S, so that the solid salt S is efficiently dissolved, which is preferable for the high-salt concentration acid treatment liquid supply mechanism of the laver cultivation acid treatment ship of the present invention. Further, an outflow hole 94a is provided on the side surface portion of the salt storage housing 94 at a position where the height from the bottom surface portion is 10 mm in this embodiment (up to the lower end of the outflow hole 94a). By doing so, a liquid pool of the high-salt concentration acid treatment liquid 31s is formed at the bottom surface portion of the salt storage housing 94, and the contact time with the solid salt S becomes longer, so that the solid salt S is efficiently dissolved at an appropriate concentration, which is preferable for the high-salt concentration acid treatment liquid supply mechanism of the laver cultivation acid treatment ship of the present invention. The height position (up to the lower end of the outflow hole 94a) from the bottom surface portion of the side surface outflow hole 94a of the salt storage housing 94 is preferably at a position of 10 to 60 mm. If it is less than 10 mm, the amount of the liquid pool is small and it does not contribute to the improvement of the solubility of the solid salt S. If it exceeds 60 mm, the amount of the liquid pool becomes excessive and the dissolution of the solid salt S is too much, making it difficult to control the concentration of the appropriate high-salt acid treatment liquid.

[0049] According to the laver net acid treatment ship C of the third embodiment configured as described above, since a mechanism for connecting the salt storage housing 94 for storing the solid salt S to the circulation part 60 (acid treatment liquid storage tank 39) and supplying the high-salt concentration acid treatment liquid 31s prepared with the acid treatment liquid 31 in the circulation system by a submersible pump to the acid treatment liquid storage tank 39 is provided, the circulation of the acid treatment liquid (as a whole) in the laver cultivation acid treatment ship (submersible ship) is smoothly performed, and the high-salt concentration acid treatment liquid 31s synchronized with the state (acid concentration, liquid temperature, etc.) of the acid treatment liquid in the circulation system that changes each time is supplied to the acid treatment liquid storage tank 39, so that a laver net acid treatment ship capable of achieving uniform and effective high-salt treatment can be obtained.

[0050] In FIG. 4, as an example of the salt storage housing 94 of the present invention, a form is shown in which the acid treatment liquid supply section 95 is provided at the upper peripheral edge of the salt storage housing 94 and the bottom surface portion of the salt storage housing 94 has an outflow hole 94a. (a) to (c) are schematic plan / front / side views in a state where the solid salt S is not stored, and (d) is a schematic side view in which the solid salt S (in a state of being placed in a mesh-like cloth bag 96) is stored. The bottom surface portion of the salt storage housing 94 shown in FIG. 4 has a plurality of outflow holes 94a in the form of fine slits over the entire surface (the size and shape are not particularly limited as long as the outflow loss of the solid salt S is not caused). And the acid treatment liquid supply section 95 shown in FIG. 4 has a plurality of discharge holes 95a in a rectangular ring shape along the upper peripheral edge of the salt storage housing 94 (the shape is not particularly limited as long as it generally follows the upper peripheral edge of the salt storage housing 94) and discharges downward inside the salt storage housing 94, and is connected to the acid treatment liquid supply path 93. According to the salt storage housing 94 of FIG. 4 configured as described above, the acid treatment liquid 31 is supplied from the acid treatment liquid supply section 95 to the entire upper surface of the solid salt S in a shower-like manner, and comes into uniform contact with the solid salt S, so that the solid salt S is efficiently dissolved. The high-salt-concentration acid treatment liquid 31s is supplied from the salt storage housing 94 to the upper surface opening of the acid treatment liquid storage tank 39 in a shower-like manner and comes into wide contact with the acid treatment liquid 31 in the acid treatment liquid storage tank 39, so that the high-salt-concentration acid treatment liquid 31s and the acid treatment liquid 31 are efficiently mixed. This is preferable for the high-salt-concentration acid treatment liquid supply mechanism of the laver cultivation acid treatment ship of the present invention.

[0051] In FIG. 5, as another example of the salt storage housing 94 of the present invention different from FIG. 4, a form is shown in which the acid treatment liquid supply section 95 is provided inside the solid salt S of the salt storage housing 94 and the side surface portion of the salt storage housing 94 has an outflow hole 94a. (a) to (c) are schematic plan / front / side views in a state where the solid salt S is not stored, and (d) is a schematic side view in which the solid salt S (placed in a mesh-like cloth bag 96 and having an upper opening that is loosely opened) is stored. On the side surface of the salt storage housing 94 shown in Fig. 5, there is at least one (the number, size and shape are not particularly limited as long as the solid salt S does not flow out excessively) outflow hole 94a at the position of height X from the bottom surface. The height X (to the lower end of the outflow hole 94a) of the outflow hole 94a on the side surface from the bottom surface is preferably in the range of 10 to 60 mm, because an appropriate liquid pool is formed and an appropriate contact time with the solid salt S for proper salt dissolution is obtained. And the acid treatment liquid supply part 95 shown in Fig. 5 has two discharge holes 95a (at least one or more is sufficient) inside the solid salt S of the salt storage housing 94 and is connected to the acid treatment liquid supply path 93. According to the salt storage housing 94 of Fig. 5 configured as described above, the acid treatment liquid 31 at the outlet of the acid treatment liquid supply part 95 comes into contact with the solid salt S and flows in a wide direction inside the solid salt S, so that the solid salt S is efficiently dissolved. Further, a liquid pool of the high salt concentration acid treatment liquid 31s is formed at the bottom surface of the salt storage housing 94, and the contact time with the solid salt S becomes longer, so that an appropriate concentration of the high salt concentration acid treatment liquid 31s is obtained. Therefore, it is preferable for the high salt concentration acid treatment liquid supply mechanism of the laver cultivation acid treatment ship of the present invention.

[0052] The laver cultivation acid treatment ship of the present invention is not limited to the first to third embodiments (Figs. 1 to 3), and various modified embodiments below can be adopted without changing the gist of the present invention. For example, in laver cultivation acid treatment ships with an acid treatment tank inclined downward from the stern to the bow like those in the first to third embodiments (diving ships A and B), or laver cultivation acid treatment ships with a horizontal acid treatment tank and a liquid recovery plate surface inclined downward in front of it (diving ship C), for various general laver cultivation acid treatment ships (diving ships) having a basic circulation part (acid treatment tank - recovery path - acid treatment liquid storage tank - supply path -) and a pH control mechanism, the high salt concentration acid treatment mechanism of the present invention can be effectively adopted. Also, the equipment of the ship body such as a thruster is not particularly limited. Also, in Figs. 4 and 5, the salt storage housing 94 is shown in a rectangular parallelepiped shape, but it is not limited thereto, and various shapes such as cylindrical and conical shapes may be adopted.

Industrial Applicability

[0053] It can be suitably used for an acid treatment ship (diving ship) for seaweed nets, which can efficiently perform acid treatment on fungi such as diatoms and red rot bacteria attached to seaweed nets during seaweed cultivation with an acid treatment agent (liquid) having a higher salt concentration than the seaweed cultivation sea area.

Explanation of Signs

[0054] A, B, C Acid treatment ship (diving ship) for cultivated seaweed nets 10 Ship body 20 Guide for seaweed nets 31 Acid treatment liquid 31s High-salt concentration acid treatment liquid 35 Acid treatment tank 39 Acid treatment liquid storage tank 40 Acid stock solution supply device 50 Control unit 60 Circulation unit 61 Tubular member 62 Side discharge pipe 63 U-shaped discharge pipe 70 Convex member 80 Side thruster 81 Hydraulic motor 82 Hydraulic device 90 Salt control unit 91 Salt detector 92 Acid treatment liquid supply adjustment device 93 Acid treatment liquid supply path 94 Salt storage housing 94a Outflow hole 95 Acid treatment liquid supply unit 95a Tubular member discharge hole S Solid salt

Claims

**Claim 1** A laver aquaculture acid treatment ship, comprising at least: a guide for guiding a laver net from the bow side onto the ship and back to the sea from the stern; an acid treatment tank for bringing the laver net moving along the laver net guide into contact with an acid treatment solution; a circulation section consisting of the acid treatment tank, a path for supplying the acid treatment solution to the acid treatment tank, a path for recovering the acid treatment solution after contacting the laver net from the acid treatment tank, and an acid treatment solution storage tank to which both paths are connected; and a control section for detecting the pH value of the acid treatment solution in the acid treatment solution storage tank and operating an acid stock solution supply device for supplying an acid stock solution of the acid treatment solution into the acid treatment solution storage tank based on the detected value to control the acid treatment solution to a constant pH value. The laver aquaculture acid treatment ship is provided with a salt storage housing for containing a solid salt having outflow holes at least on the bottom surface and / or side surface. An acid treatment solution supply section connected to the circulation section and for supplying the acid treatment solution from the circulation section to the salt storage housing is arranged in the salt storage housing. The acid treatment solution fed from the acid treatment solution supply section is supplied to the solid salt in the salt storage housing, so that the solid salt dissolves and an acid treatment solution having a high salt concentration higher than that of the laver cultivation sea area flows out from the outflow holes of the salt storage housing and returns to the acid treatment solution storage tank. A salinity control section is provided for detecting the salinity concentration of the acid treatment solution in the acid treatment solution storage tank and controlling the supply amount of the acid treatment solution supplied to the salt storage housing based on the detected value to obtain a constant high salt concentration. **Claim 2** The laver aquaculture acid treatment ship according to claim 1, wherein the solid salt has an average particle size of 1 mm or more. **Claim 3** The laver aquaculture acid treatment ship according to claim 1 or claim 2, wherein the acid treatment solution supply section is provided at the upper peripheral edge of the salt storage housing. **Claim 4** The laver aquaculture acid treatment ship according to claim 1 or claim 2, wherein the acid treatment solution supply section is a tubular member having a plurality of discharge holes provided above the salt storage housing. **Claim 5** The laver aquaculture acid treatment ship according to claim 1 or claim 2, wherein the acid treatment solution supply section is provided inside the solid salt of the salt storage housing. **Claim 6** The laver aquaculture acid treatment ship according to claim 1 or claim 2, wherein the side surface outflow holes of the salt storage housing are located at a position 10 to 60 mm in height from the bottom surface. **Claim 7** The laver aquaculture acid treatment ship according to claim 1 or claim 2, wherein the salt storage housing is provided at a position in front of the center of the hull.

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