Seaweed net acid treatment ship
The vessel addresses contact and dispersion issues by using a tubular member with discharge holes and flexible tubes or air venting to supply acid concentrate efficiently, achieving uniform pH control and minimizing seaweed damage during acid treatment.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- DAIICHI CO LTD
- Filing Date
- 2025-01-10
- Publication Date
- 2026-07-23
AI Technical Summary
Conventional seaweed net acid treatment vessels face issues with seaweed nets coming into contact with concentrated acid solution, dispersion of acid solution into the air, and inefficient dilution by brought-in seawater, leading to potential damage and inconsistent pH control during acid treatment.
The vessel incorporates a tubular member with discharge holes near the seaweed net entry side, equipped with flexible tubes or air venting mechanisms, to supply acid concentrate into the acid treatment solution without direct contact and airborne dispersion, ensuring rapid dilution and uniform pH control.
Prevents direct contact of seaweed nets with acid concentrate, suppresses airborne dispersion, and quickly adjusts pH to a uniform level, minimizing damage and ensuring reliable acid treatment of seaweed nets.
Smart Images
Figure 2026121086000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an acid treatment ship for seaweed nets that acid-treats fungi such as diatoms and red rot bacteria adhering to seaweed nets during aquaculture with an acid treatment agent (liquid), and particularly relates to a box-shaped ship having a pair of winding rolls for winding up seaweed nets in an acid treatment tank.
Background Art
[0002] Conventionally, in seaweed farms, there are many types and structures of acid treatment ships for seaweed nets that effectively perform acid treatment on fungi such as diatoms and red rot bacteria adhering to seaweed nets extended on the sea surface with an acid treatment agent having a composition combined with organic acids such as citric acid and malic acid.
[0003] [[ID=;15]] Generally, such an acid treatment ship for seaweed nets is an acid treatment ship for seaweed nets that can accelerate the growth of seaweed by immersing the seaweed nets in an acid treatment liquid with a certain pH value, and moreover, can harvest high-quality seaweed by keeping the growth of each seaweed net in a constant state. This acid treatment ship for seaweed nets is composed of an acid treatment tank with a certain capacity, a seaweed net hoisting device, an acid stock solution replenishing device for replenishing the acid stock solution into the acid treatment tank, and a control unit that detects the pH value of the acid treatment liquid in the acid treatment tank and operates the replenishing device based on the detected value to maintain the acid treatment liquid at a certain pH value, for example, around pH 2.0 (see, for example, Patent Document 1).
[0004] Also, as a small acid treatment ship for seaweed nets, an acid treatment ship using a box-shaped ship is known. As this small acid treatment ship for seaweed nets, for example, 1) An acid treatment ship for seaweed nets having an acid treatment tank provided with a seaweed net hoisting device for hoisting seaweed nets from the sea, a chemical solution circulation device for circulating the chemical solution, and a concentration detection device for detecting the concentration of the chemical solution circulated by the chemical solution circulation device (see, for example, Patent Document 2). 2) A box-shaped vessel capable of maintaining an acid treatment solution at a desired pH value, comprising an acid treatment tank for storing the acid treatment solution, and a pair of winding rolls provided in the acid treatment tank for winding up seaweed nets to which seaweed is attached, wherein the box-shaped vessel comprises a pH sensor provided in the acid treatment tank for detecting the pH of the acid treatment solution, a concentrate discharge unit provided in a position that does not interfere with the seaweed nets wound up on the winding rolls for discharging concentrate acid solution, and a concentrate supply device that automatically adjusts the amount of concentrate acid solution supplied to the concentrate discharge unit based on the pH sensor's detection value, wherein the concentrate discharge unit comprises a rod-shaped member provided between the pair of winding rolls and positioned above the acid treatment tank so as to face the surface of the acid treatment solution, a sheet member hanging down from the rod-shaped member toward the surface of the acid treatment solution, and tubular members provided on both sides of the sheet member along the rod-shaped member and having a plurality of discharge holes formed at predetermined intervals for discharging concentrate acid solution toward the sheet member (see, for example, Patent Document 3). 3) In order to prevent the acid concentrate or an acid treatment solution with a higher concentration than desired from coming into contact with the seaweed nets during acid treatment of seaweed nets, a box-shaped vessel is provided, comprising an acid treatment tank for storing an acid treatment solution diluted from the acid concentrate, and a winding roll provided in the acid treatment tank for winding up seaweed nets to which seaweed has been attached, wherein the vessel is provided with a flexible sheet that hangs down and is separated from the winding roll, and an acid concentrate discharge section for discharging the acid concentrate onto the surface of the flexible sheet, and an acid concentrate supply section for supplying the acid concentrate to the acid treatment tank by allowing it to flow down the surface of the flexible sheet, wherein the acid concentrate supply section is configured such that when the acid treatment tank is tilted so that the lower end of the flexible sheet approaches the winding roll, A box-shaped vessel characterized by supplying the acid concentrate at a position further from the winding roll than the lower end of the flexible sheet at the surface of the acid treatment solution, and a box-shaped vessel (see, for example, Patent Document 4) in which the flexible sheet has an opening or notch at its upper end located above the surface of the acid treatment solution, and the acid concentrate discharge section discharges the acid concentrate so that the acid concentrate flows into the upper end of the opening or notch, and the opening is formed in multiple stages in the vertical direction, and further, the flexible sheet has a notch at its upper end located above the surface of the acid treatment solution, and a rib hanging down from the upper end of the notch, etc. 4) A box-shaped vessel comprising an acid treatment tank for storing acid treatment liquid and a winding roll provided in the acid treatment tank for winding up seaweed nets to which seaweed has been attached, in order to suppress or prevent the acid concentrate from adhering to the seaweed nets, wherein the acid treatment tank is provided with a pH sensor for detecting the pH of the acid treatment liquid, a concentrate discharge unit for discharging the acid concentrate into the acid treatment liquid in the acid treatment tank, and a concentrate supply device for automatically adjusting the amount of the acid concentrate supplied to the concentrate discharge unit based on the pH sensor's detection value, wherein the concentrate discharge unit is provided at the bottom of the sheet member or hanging down from above via the sheet member (see, for example, Patent Document 5 or Patent Document 6). 5) A box-shaped vessel is known that includes an acid treatment tank for storing acid treatment liquid and a pair of winding rolls provided in the acid treatment tank for winding up seaweed nets to which seaweed has been attached, in order to maintain the acid treatment liquid at a desired pH value by allowing the acid concentrate to flow into the acid treatment liquid of the acid treatment tank so that the acid concentrate does not come into direct contact with the seaweed nets, and the box-shaped vessel is provided in the acid treatment tank for detecting the pH of the acid treatment liquid and includes a pH sensor provided in the acid treatment tank for detecting the pH of the acid treatment liquid, a concentrate discharge unit located at a position that does not interfere with the seaweed nets being wound up on the winding rolls, and a concentrate supply device that automatically adjusts the amount of the acid concentrate supplied to the concentrate discharge unit based on the value detected by the pH sensor, wherein the concentrate discharge unit discharges the acid concentrate towards the wall near the wall on the side where the seaweed nets enter, or discharges the acid concentrate in a direction different from the seaweed nets on the side where the seaweed nets enter (see, for example, Patent Document 7 or Patent Document 8).
[0005] Patent documents 3 to 8 describe a box-shaped vessel having a pair of winding rolls for winding seaweed nets into an acid treatment tank. In acid treatment using the box-shaped vessels described in these patent documents, it is important to maintain the pH of the acid treatment solution at a desired value in order to fully exert the acid treatment effect by keeping the component concentration within an appropriate range while suppressing direct contact of the raw acid solution with the seaweed nets and exposure of the seaweed nets to high-concentration solutions. The phenomenon of the acid treatment solution deviating from the appropriate pH range is due to seawater brought in along with the cultivated seaweed nets wound from the aquaculture area, and this introduction of seawater occurs in the acid treatment solution on the side where the seaweed nets enter via the winding rolls.
[0006] However, in the aforementioned Patent Documents 3 to 6, the discharge point for the concentrated acid solution used to replenish the diluted acid treatment solution is located at the central sheet member of the acid treatment tank, which is far from the aforementioned seawater introduction point. This presents a problem as it does not allow for a rapid and appropriate resolution of the diluted acid treatment solution.
[0007] In the aforementioned Patent Documents 7 and 8, the discharge point of the concentrated acid solution is on the entry side of the seaweed net, which is in an appropriate position relative to the dilution point. However, even though the discharge point of the concentrated acid solution is positioned so as not to interfere with the seaweed net being wound onto the winding roll, if the amount of seaweed net wound onto the winding roll increases, there is a higher risk that the outer circumference of the wound-up seaweed net will come into contact with the concentrated acid solution. If the discharge speed is high or the wind is strong in the sea area, splashes of the concentrated acid solution may come into contact with the seaweed net, causing damage to the cultivated seaweed and posing other problems. [Prior art documents] [Patent Documents]
[0008] [Patent Document 1] Japanese Patent Publication No. 5-95740 (Claims, Figure 1, etc.) [Patent Document 2] Utility Model Registration No. 3212304 (Claims for Utility Model Registration, Figure 1, etc.) [Patent Document 3] Japanese Patent Publication No. 6161016 (Claims, Figures 1, 2, etc.) [Patent Document 4] Japanese Patent Publication No. 6218984 (Claims, Figures 1-4, etc.) [Patent Document 5] Japanese Patent Publication No. 6898087 (Claims, Figures 1-4, etc.) [Patent Document 6] Japanese Patent Publication No. 7160399 (Claims, Figures 1-4, etc.) [Patent Document 7] Japanese Patent Publication No. 6672252 (Claims, Figure 3, etc.) [Patent Document 8] Japanese Patent Publication No. 7005039 (Claims, Figure 3, etc.) [Overview of the project] [Problems that the invention aims to solve]
[0009] The present invention aims to solve the aforementioned problems of the conventional methods, and provides a seaweed net acid treatment vessel that uses an acid treatment agent (liquid) to acidify seaweed nets to remove diatoms and fungi such as red rot bacteria that adhere to seaweed nets during cultivation. The invention aims to provide a seaweed net acid treatment vessel that prevents the wound-up seaweed nets from coming into contact with the concentrated acid solution, prevents the solution from being dispersed into the air as droplets, quickly eliminates dilution by the brought-in seawater, efficiently supplies the concentrated acid solution to the acid treatment solution, and minimizes the opportunity for the seaweed nets to come into contact with the concentrated acid solution within the acid treatment solution, thereby ensuring that the seaweed nets are reliably acidified with the acid treatment solution. [Means for solving the problem]
[0010] As a result of diligent study on the aforementioned conventional problems, the inventors have found that, in a seaweed net acid treatment vessel comprising at least an acid treatment tank for containing an acid treatment solution, a pair of winding rolls for winding up seaweed nets provided in the acid treatment tank, an acid concentrate supply device for supplying a concentrate of acid treatment solution into the acid treatment tank, and a control unit for detecting the pH value of the acid treatment solution in the acid treatment tank and operating the acid concentrate supply device based on the detected value to control the acid treatment solution to a constant pH value, the inventors have found that the aforementioned seaweed net acid treatment vessel can be obtained by providing a tubular member having a specific structure, etc., in the acid concentrate supply device at a specific position and under specific conditions in the acid treatment tank, and have completed the present invention.
[0011] In other words, they are found in (1) to (4) below. (1) A seaweed net acid treatment vessel comprising at least an acid treatment tank for containing an acid treatment solution, a pair of winding rolls provided in the acid treatment tank for winding up seaweed nets, an acid concentrate supply device for supplying concentrated acid treatment solution into the acid treatment tank, and a control unit for detecting the pH value of the acid treatment solution in the acid treatment tank and operating the acid concentrate supply device based on the detected value to control the acid treatment solution to a constant pH value, wherein the acid concentrate supply device has a tubular member provided near the wall surface on the side where the seaweed nets enter the acid treatment tank and having a plurality of discharge holes for supplying concentrated acid treatment solution into the acid treatment solution. (2) The seaweed net acid treatment vessel according to (1) above, characterized in that the tubular member is provided in the acid treatment liquid of the acid treatment tank. (3) The seaweed net acid treatment vessel according to (1) above, characterized in that the tubular member is provided above the acid treatment liquid surface of the acid treatment tank, and a visible flexible tube is provided to guide the raw acid solution into the acid treatment liquid from a plurality of discharge holes. (4) The seaweed net acid treatment vessel according to (3) above, characterized in that the flexible tube has an air release mechanism to the atmosphere. In this invention, "discharge" means that the acid concentrate is supplied to the acid treatment solution from the discharge hole of the tubular member at a constant pressure. "Supply" means that the acid concentrate is released from the tubular member into the acid treatment solution, regardless of whether or not there is pressure acting on the acid concentrate. [Effects of the Invention]
[0012] According to the invention of claim 1 or 2, the acid concentrate supply device has a tubular member provided near the wall surface on the side of the acid treatment tank where the seaweed net enters, and equipped with a plurality of discharge holes for discharging the acid concentrate into the acid treatment liquid. Therefore, there is no risk of adverse effects (cell damage) from direct contact of the acid concentrate with the seaweed net above the acid treatment liquid surface and from airborne droplets. The acid concentration is quickly reduced on the side where the seaweed net enters, and the acid concentrate is supplied into the acid treatment liquid near the winding recirculation, so the dilution of the acid concentrate proceeds quickly, which also helps to suppress damage to the seaweed (cells) in the liquid. Thus, an acid treatment vessel for seaweed nets is provided that can reliably acid treat the seaweed nets with an acid treatment liquid that maintains a uniform pH. According to the invention of claim 3, since the tubular member is provided above the acid treatment liquid level of the acid treatment tank and includes a flexible tube having visibility to guide the acid stock solution from each of the plurality of discharge holes into the acid treatment liquid, there is an advantage that an operator can visually confirm the supply of the acid stock solution into the acid treatment liquid, and an acid treatment ship for nori nets that can more safely and surely acid-treat nori nets with an acid treatment liquid having uniform pH control is provided. According to the invention of claim 4, since the flexible tube of the tubular member has an air venting mechanism to the atmosphere, gentle supply in the acid treatment liquid can be achieved without receiving the pump pressure of the acid stock solution supply device, so stirring by the winding-back flow effectively works. Also, there is no worry about unintended concentration fluctuations (inadequate pH control) due to the leakage of the acid stock solution when the pump stops. Therefore, an acid treatment ship for nori nets that can more appropriately and surely acid-treat nori nets with an acid treatment liquid having uniform pH control is provided.
Brief Description of the Drawings
[0013] [Figure 1] It is a drawing of an acid treatment ship for nori nets showing the first embodiment of the present invention, where (a) is a schematic plan view, (b) is a schematic front view, and (c) is a schematic side view. [Figure 2] (a) is a drawing seen from the bottom side showing an example of a tubular member used in the acid treatment ship for nori nets of FIG. 1, (b) is a drawing seen from the side, and (c) is a schematic drawing showing an example of the attachment state of the tubular member. [Figure 3] It is a drawing of an acid treatment ship for nori nets showing the second embodiment of the present invention, where (a) is a schematic plan view, (b) is a schematic front view, and (c) is a schematic side view. [Figure 4] (a) is a drawing seen from the bottom side showing an example of a tubular member used in the acid treatment ship for nori nets of FIG. 3, (b) is a drawing seen from the side, and (c) is a schematic drawing showing an example of the attachment state of the tubular member and the tube. [Figure 5] It is a drawing of an acid treatment ship for nori nets showing the third embodiment of the present invention, where (a) is a schematic plan view, (b) is a schematic front view, and (c) is a schematic side view. [Figure 6](a) is a drawing seen from the bottom side showing an example of a tubular member used in the laver net acid treatment ship of FIG. 5, (b) is a drawing seen from the side, and (c) is a schematic drawing showing an example of the attachment state of the tubular member and the tube.
Mode for Carrying Out the Invention
[0014] Hereinafter, each embodiment of the present invention will be described in detail. <000 The acid treatment tank 15 is a rectangular concave body formed in the center of the ship's hull 10 and is designed to hold a predetermined amount of acid treatment liquid 11. The spaces 16, 16 on both sides of the acid treatment tank 15 are where the acid concentrate supply device 40, the control unit 50, the drive unit (not shown) for winding rolls and other components, the battery (not shown) that drives these components, and other components are located, and also serve as workspaces for the workers.
[0017] The winding rolls 20 are rotating shafts for winding up the seaweed nets and are arranged in pairs at predetermined locations within the acid treatment tank 15. These winding rolls 20, 20 are rotatably mounted, with one winding roll 20 sequentially winding up the seaweed nets in front when the ship body 10 moves forward (upper side in Figure 1), and the other winding roll 20 sequentially winding up the seaweed nets in rear when the ship body 10 moves backward (lower side in Figure 1). In this embodiment, dispensing rolls 21, 21, which serve as rotating shafts for dispensing the seaweed nets toward the sea, are rotatably mounted near both sides of the support member 25. The pair of winding rolls 20 and unwinding rolls 21, positioned on both sides of the support member, are driven by a drive unit (not shown) having an operating device provided in the space 16.
[0018] The support member 25 is composed of a rod-shaped member and is suspended in the center of the acid treatment tank 15 in the width direction, and is fixed to the upper surfaces on both sides of the acid treatment tank 15 either via mounting members or directly. A sheet-like resin member 30, which hangs down toward the acid treatment liquid 11 of the acid treatment tank 15, is attached to this support member 25. In this embodiment, the sheet-like resin member 30 is made of soft polyvinyl chloride and is positioned near the bottom of the acid treatment liquid 11 in the acid treatment tank 15. A rod-shaped member 31, which acts as a weight (sinker), is attached to the bottom of the sheet-like member 30. This sheet-like member 30 acts as a curtain to prevent the seaweed nets, which are wound onto the winding rolls 20 or unwinding rolls 21 positioned on both sides of the sheet-like member 30, from becoming entangled. Therefore, it is preferable that the lower part of the sheet-like member 30 extends to near the bottom of the acid treatment liquid 11 in the acid treatment tank 15.
[0019] As shown in Figures 1(a) and (b), the acid concentrate supply device 40 is positioned at an appropriate location in the space 16 of the acid treatment tank 15 (away from the acid treatment tank to the extent that it does not interfere with the winding and unwinding of the seaweed nets, and does not get in the way of work, for example, in the space under the worker's simple seat), and supplies the acid concentrate Z of the acid treatment liquid 11 into the acid treatment tank 15. In this embodiment, the acid concentrate supply device 40 includes a concentrate tank 41 that contains the acid concentrate Z of the acid treatment liquid 11, a line 43 that connects the concentrate tank 41 to a pump 42, and a line 44 that connects the pump 42 to a tubular member 60. The control unit 50 has a pH detector 51 located at an appropriate position within the acid treatment tank 15 (a central position where the average pH of the acid treatment tank can be detected and which is not interfered with by the dispensing rolls, for example, near a sheet-like member) to detect the pH value of the acid treatment solution 11. Based on the detected value from the pH detector 51, the control unit 50 operates the pump 42 of the acid stock solution supply device 40 to supply the acid stock solution Z into the acid treatment tank 15 and controls the acid treatment solution to a constant pH value. The control unit 50 automatically adjusts the supply amount of the acid stock solution Z based on the detected value from the pH detector 51.
[0020] In the acid treatment solution 11 near the wall on the entry side of the seaweed net N being wound up from the aquaculture area within the acid treatment tank 15, a resin tubular member 60, in this embodiment a tubular member 60 made of FRP with a length of 190 cm, an inner diameter of 3 mm, and an outer diameter of 8 mm, is attached by fasteners such as cable ties or adhesive. In this embodiment, another tubular member 60 is similarly attached near the wall on the discharge side of the seaweed net (opposite the entry side). As shown in Figures 1(a)-(c) and 2(a)-(c), the tubular member 60 is supplied with concentrated acid solution Z from one opening, and a stopper member 62 is fixed to the other end. The lower part (bottom side) of the tubular member 60 is provided with a plurality of discharge holes 61a, 61b... (in this embodiment, six discharge holes 61a-61f) for discharging the concentrated acid solution. The tubular member 60 is positioned below the liquid level Y of the acid treatment liquid 11 in the acid treatment tank 15 so that the concentrated acid solution Z discharged from the discharge holes 61a-61f is supplied into the liquid level Y of the acid treatment liquid 11 near the wall surface on the side where the seaweed net N enters. The aforementioned discharge holes 61a, 61b, etc. may be provided in predetermined numbers at predetermined intervals. However, in this embodiment, as shown in Figures 1 and 2, six discharge holes 61a to 61f (with a diameter of 1.2 mm) are provided at equal intervals, taking into consideration the pressure (water pressure) of the pump 42 of the acid stock solution Z and the length of the tubular member 60, in order to discharge an equivalent amount of acid stock solution from each discharge hole 61a, 61b, etc. Furthermore, a diameter of 1.0 to 2.0 mm is preferred for the discharge holes in order to maintain uniform discharge.
[0021] The acid treatment of seaweed nets using the seaweed net acid treatment vessel A of this first embodiment, configured as described above, will be explained below. Since the procedure is the same whether the vessel 10 is moving forward or backward, this embodiment will only explain the case when the vessel 10 is moving forward (upper side of Figure 1). After moving the seaweed net acid treatment vessel A to the sea where the cultivated seaweed nets are installed, the vessel 10 is moved forward. As it moves forward, the seaweed nets enter the acid treatment tank 15 from the front, and the entered seaweed nets are sequentially wound onto the winding rolls 20 as the winding rolls 20 are rotated by the drive unit (not shown). The wound seaweed nets are then immersed in the acid treatment liquid 11 contained in the acid treatment tank 15, and the seaweed is acid-treated. Inside the acid treatment tank 15, the pH of the acid treatment solution 11 is detected by a pH detector 51, and the detected value from the pH detector 51 is output to the control unit 50. Based on the detected value input from the pH detector 51 and a preset control threshold, the control unit 50 provides feedback control to the pump 42 of the acid concentrate supply device 40. Based on the operation signal input from the control unit 50, the pump 42 draws a predetermined amount of acid concentrate Z corresponding to the operation signal from the acid concentrate tank 41 and supplies it to the tubular members 60, 60 via the line 44. Furthermore, the control unit 50 can automatically adjust the amount of acid concentrate Z supplied to the acid treatment solution 11 by controlling the pump 42 based on the detected value from the pH detector 51.
[0022] The acid concentrate Z, drawn from the acid concentrate tank 41 by the pump 42 upon receiving an operating signal from the pH detector 51, is supplied to the tubular members 60, 60 and discharged into the acid treatment liquid 11 through a plurality of discharge holes 61a to 61f (each) provided in the tubular members 60, 60. The acid concentrate Z discharged into the acid treatment liquid 11 dissolves immediately in the acid treatment liquid 11 due to the stirring action of the circulating flow generated by the winding rotation of the acid concentrate on the entry side of the seaweed net N. This solubility is due to the fact that the acid concentrate Z is water-soluble, and along with the stirring action, the circulating flow generated in the acid treatment liquid 11 by the rocking of the ship body 10 and the rotation of the feed roll 21 causes the acid treatment liquid 11 to become agitated, causing it to dissolve and diffuse in the acid treatment liquid 11 which has been diluted with seawater during the acid treatment. This allows the pH value in the acid treatment liquid 11, which has fluctuated to a high value, to be brought down to a predetermined pH value. The pH value can also be checked on a waterproof pH display LCD screen (not shown) provided in the control unit 50. The seaweed nets to which the cultivated seaweed to be treated with acid are wound onto the winding roll 20 and then onto the dispensing roll 21. After being treated with acid, the seaweed nets wound onto the dispensing roll 21 are unwound outside the ship hull 10 as the ship hull 10 moves forward and are installed in the aquaculture area where the wound-up seaweed nets were previously installed.
[0023] According to the acid treatment vessel A for seaweed nets of this first embodiment, configured as described above, the acid concentrate supply device 40 has a tubular member 60 provided near the wall surface on the side where the seaweed net enters the acid treatment tank 15, and equipped with a plurality of discharge holes 61a to 61f for discharging the acid concentrate into the acid treatment liquid 11. As a result, the acid concentrate does not disperse into the air as droplets due to strong winds, the wound-up seaweed net does not come into direct contact with the acid concentrate, and the decrease in acid concentration on the side where the seaweed net N enters is quickly resolved and the acid concentrate is supplied into the acid treatment liquid near the winding recirculation, so the dilution of the acid concentrate proceeds quickly, which also helps to suppress damage to the seaweed (cells) in the liquid, and an acid treatment vessel for seaweed nets that can reliably acid-treat the seaweed nets with the acid treatment liquid is obtained.
[0024] Figure 3 is a drawing of a seaweed net acid treatment vessel showing a second embodiment of the present invention, where (a) is a schematic plan view, (b) is a schematic front view, and (c) is a schematic side view. Figure 2(a) is a view from the bottom showing an example of a tubular member used in the seaweed net acid treatment vessel of Figure 1, (b) is a view from the side, and (c) is a schematic drawing showing an example of the mounting state of the tubular member. In the following second and third embodiments, components similar to those in the first embodiment are indicated by the same reference numerals in the drawings, and their descriptions are omitted. The second embodiment of the present invention, the seaweed net acid treatment vessel B, is the same as the first embodiment (acid treatment vessel A) in that it has a tubular member 60 provided near the wall surface on the side where the seaweed net enters the acid treatment tank 15 and equipped with a plurality of discharge holes 61a to 61f for discharging concentrated acid, but in this embodiment, visible flexible tubes 63a to 63f are attached to each of the discharge holes 61a to 61f of the tubular member 60. As shown in Figures 3(a) to (c) and 4(a) to (c), each discharge hole 61a to 61f of this tubular member 60 is fitted with a visible, flexible tube 63a to 63f made of resin, elastomer, or rubber, which guides the undiluted acid solution Z discharged from the discharge holes 61a to 61f into the liquid surface Y of the acid treatment solution 11. This tube is fixed, welded, or fitted with a mounting device. The visible flexible tubes 63a to 63f are long enough to penetrate the acid treatment solution 11 below its liquid level Y. Therefore, the tubular member 60 itself is installed above the liquid level Y of the acid treatment solution 11, while the tip openings of the flexible tubes 63a to 63f are installed below the liquid level Y of the acid treatment solution 11 (inside the acid treatment solution 11). The flexible tubes 63a to 63f only need to be visible (allowing the raw acid solution to be seen with the naked eye), and can be transparent or translucent. If they are transparent or translucent, the discharge of the raw acid solution Z inside the flexible tube can be seen with the naked eye. The diameter of the holes (inner diameter) of the visible flexible tubes is the same as or larger than the diameter of the discharge hole 61. In this embodiment, the inner diameter is 4 mm, and it is made of a transparent, visible flexible tube (140 mm in length) made of polyvinyl chloride. Regarding the length and inner diameter of the flexible tube 63 used in the present invention, in order for the acid stock solution Z to be properly supplied into the acid treatment solution 11 near the side wall surface of the seaweed net entry of the box-shaped vessel, a length of 70 to 280 mm and an inner diameter of 2 to 6 mm are preferable. According to the second embodiment of the present invention, the acid treatment vessel B for seaweed nets is provided with a tubular member 60 positioned above the liquid surface Y of the acid treatment solution 11 in the acid treatment tank 15, and is equipped with visible flexible tubes 63a to 63f that guide the concentrated acid solution Z discharged from each of the multiple discharge holes 61a to 61f into the acid treatment solution 11. This has the advantage that the operator can visually confirm the discharge (supply) of the concentrated acid solution Z into the acid treatment solution 11, and allows for safer and more reliable acid treatment of seaweed nets with an acid treatment solution that maintains a uniform pH.
[0025] In this second embodiment, as in the first embodiment, the pH value of the acid treatment solution, which has fluctuated to a high value due to the acid treatment work, can be automatically adjusted to a predetermined pH value by the operation of the acid stock solution supply device 40, control unit 50, etc., and the pump 42, which receives the operation signal from the pH detector 51, pumps the acid stock solution tank 41 The acid concentrate Z drawn out is supplied to the tubular members 60, 60, and passes through a plurality of discharge holes 61a to 61f (each) provided in the tubular members 60, 60, through visible flexible tubes 63a to 63f, and is discharged (supplied) into the acid treatment liquid 11 from the opening at the end of the tube. As a result, the acid concentrate does not disperse into the air as droplets due to strong winds, the wound-up seaweed net does not come into direct contact with the acid concentrate, and the decrease in acid concentration on the entry side of the seaweed net N is quickly resolved and the acid concentrate is supplied into the acid treatment liquid near the winding recirculation, so the dilution of the acid concentrate proceeds quickly, which also helps to suppress damage to the seaweed (cells) in the liquid, and a seaweed net acid treatment vessel is obtained that can reliably acid treat the seaweed net with the acid treatment liquid.
[0026] Figure 5 is a drawing of a seaweed net acid treatment vessel showing a third embodiment of the present invention, where (a) is a schematic plan view, (b) is a schematic front view, and (c) is a schematic side view. Figure 2(a) is a view from the bottom showing an example of a tubular member used in the seaweed net acid treatment vessel of Figure 1, (b) is a view from the side, and (c) is a schematic drawing showing an example of the mounting state of the tubular member. Furthermore, the material and mounting position of the tubular member 60, the visible flexible tube 63, etc. are the same as in the second embodiment described above. The third embodiment of the present invention, a seaweed net acid treatment vessel C, is provided with an air venting mechanism (flexible tubes 64a to 64f) for the flexible tubes 63a to 63f attached to the multiple discharge holes 61a to 61f of the tubular member 60 of the second embodiment, and in this embodiment, an air hole of about 1 mm in diameter is made on the upper part of one side of each tube (above the liquid level Y closer to the tubular member 60) that penetrates both the inside and outside of the tube. With this air venting mechanism, in the second embodiment, the acid concentrate Z is discharged (supplied) into the acid treatment liquid 11 from the tip openings of the flexible tubes 63a to 63f by directly receiving the pump pressure and pushing aside the acid treatment liquid inside the tubes. In contrast, in the third embodiment, the acid concentrate Z is supplied into the acid treatment liquid 11 from the tip openings of the flexible tubes 64a to 64f without pushing aside the acid treatment liquid inside the tubes of the flexible tubes 64a to 64f, after coming into contact with the acid treatment liquid inside the tubes. Furthermore, as shown in the schematic diagrams of the mounting state of the tubular members in Figures 2, 4, and 6(c), the relationship between the state of existence of the acid concentrate Z in the tubular member 60 and the acid treatment liquid 11 in the acid treatment tank 15 (whether or not the acid concentrate Z is in contact with the acid treatment liquid 11 at the discharge hole 61, the tip opening of the flexible tube 63, or the tip opening of the flexible tube 64) differs depending on the presence or absence of the air venting mechanism. That is, in the first and second embodiments, the acid concentrate Z in the tubular member 60 is in contact with the acid treatment liquid 11 in the acid treatment tank 15 at the discharge hole 61 or the tip opening of the flexible tube 63 and is immersed in the liquid, but in the third embodiment, the acid concentrate Z in the tubular member 60 does not fill the flexible tube 64, so the acid concentrate Z in the tubular member 60 is not in contact with the acid treatment liquid 11 in the acid treatment tank 15 at the tip opening of the flexible tube 64, and the acid concentrate Z is not immersed in the acid treatment liquid 11. According to the third embodiment of the present invention, the acid treatment vessel C for seaweed nets, since the flexible tubes 64a to 64f of the tubular member have an air release mechanism to the atmosphere, a gentle supply of the acid treatment solution can be achieved in the acid treatment solution without being subjected to the pressure of the pump 42 of the acid concentrate supply device 40. This allows for effective agitation by winding and circulating the seaweed nets N, and there is no need to worry about unintended concentration fluctuations (poor pH control) due to seepage of the acid concentrate Z into the acid treatment solution 11 when the pump 42 is stopped. Therefore, the seaweed nets can be treated more appropriately and reliably with an acid treatment solution that maintains a uniform pH.
[0027] In this third embodiment, as in the first and second embodiments, the pH value of the acid treatment solution, which has fluctuated to a high value due to the acid treatment work, can be automatically adjusted to a predetermined pH value by the operation of the acid stock solution supply device 40, control unit 50, etc., and the pump 42, which receives the operation signal from the pH detector 51, pumps the acid stock solution tank 41 The acid concentrate Z drawn out is supplied to the tubular members 60, 60, and passes through multiple discharge holes 61a to 61f (each) provided in the tubular members 60, 60, through flexible tubes 64a to 64f equipped with a visible air venting mechanism, and is supplied into the acid treatment liquid 11 from the opening at the end of the tube. As a result, the acid concentrate does not disperse into the air as droplets due to strong winds, the wound-up seaweed net does not come into direct contact with the acid concentrate, and the decrease in acid concentration on the entry side of the seaweed net N is quickly resolved and the acid concentrate is supplied into the acid treatment liquid near the winding recirculation, so the dilution of the acid concentrate proceeds quickly, which also helps to suppress damage to the seaweed (cells) in the liquid, and a seaweed net acid treatment vessel is obtained that can reliably acid treat the seaweed net with the acid treatment liquid.
[0028] The present invention is not limited to the first to third embodiments described above, but rather the gist of the present invention is as follows: Within the limits of what remains unchanged, the following modified embodiments can be adopted. For example, in the first to third embodiments described above, an example was shown in which a sheet-like member 30 is located in the center of the acid treatment tank 15. However, the present invention is not limited to this, and may also have a partition plate made of FRP or other material in the center, or it may not have these (sheet-like member, partition plate). Furthermore, in the first to third embodiments, the number of discharge holes formed in the tubular member 60 and the number of flexible tubes attached to the discharge holes were described in detail as 6 each, but the number may be any number from 2 to 10 as needed, taking into consideration the size of the treatment tank. Furthermore, in the first to third embodiments, the distance (length) between the discharge holes 61a, 61b, etc. may be varied, and / or the diameter (size) of the discharge holes 61 may be varied. [Industrial applicability]
[0029] This can be effectively used in seaweed net acid treatment vessels, which can efficiently acid-treat diatoms and fungi such as red rot bacteria that attach to seaweed nets during cultivation using an acid treatment agent (liquid). [Explanation of symbols]
[0030] A, B, C: Seaweed net acid treatment vessels Y Acid treatment liquid level Z acid stock solution N Cultured seaweed net 10. Ship hull 11 Acid treatment solution 15 Acid treatment tank 20 reel rolls 25 Support member 30 Sheet-like member 40 Acid stock solution supply equipment 50 Control Unit 51 pH detector (pH sensor) 60 Tubular member 61 Discharge hole 63. Flexible tube with good visibility 64. A highly visible, flexible tube equipped with an air venting mechanism.
Claims
1. An acid treatment vessel for seaweed nets comprising at least an acid treatment tank for containing an acid treatment solution, a pair of winding rolls provided in the acid treatment tank for winding up seaweed nets, an acid concentrate supply device for supplying concentrated acid treatment solution into the acid treatment tank, and a control unit for detecting the pH value of the acid treatment solution in the acid treatment tank and operating the acid concentrate supply device based on the detected value to control the acid treatment solution to a constant pH value, wherein the acid concentrate supply device has a tubular member provided near the wall surface on the side where the seaweed nets enter the acid treatment tank and having a plurality of discharge holes for supplying concentrated acid treatment solution into the acid treatment solution.
2. The seaweed net acid treatment vessel according to claim 1, characterized in that the tubular member is provided in the acid treatment liquid of the acid treatment tank.
3. The seaweed net acid treatment vessel according to claim 1, characterized in that the tubular member is provided above the acid treatment liquid surface of the acid treatment tank, and a visible flexible tube is provided to guide the raw acid solution into the acid treatment liquid from each of the multiple supply holes.
4. The seaweed net acid treatment vessel according to claim 3, characterized in that the flexible tube has an air venting mechanism to the atmosphere.