JP7050505B2 - Nori net acid treatment ship - Google Patents

Description

The present invention relates to an acid treatment vessel for a seaweed net that acid-treats fungi such as diatoms and red rot bacteria that adhere to the seaweed net during cultivation with an acid treatment agent (liquid).

Conventionally, fungi such as diatoms and red rot bacteria adhering to the seaweed net spread on the sea surface in the seaweed farm have been used as an acid treatment agent having a composition composed of a combination of organic acids such as citric acid and malic acid. Therefore, many types and structures of acid treatment vessels for seaweed nets that effectively perform acid treatment are known.

In such an acid treatment vessel for seaweed nets, generally, by immersing the seaweed nets in an acid treatment liquid having a constant pH value, the growth of the seaweed is accelerated, and the growth of each seaweed net is kept constant, so that the quality is good. It is an acid treatment ship of seaweed net that can harvest seaweed.
This acid treatment ship for seaweed net has a certain capacity acid treatment tank, a seaweed net pulling device, an acid stock solution replenishment device for replenishing the acid stock solution in the same acid treatment tank, and an acid treatment tank. It is composed of a control unit that detects the pH value of the acid-treated solution of the above and operates the replenishing device based on the detected value to keep the acid-treated solution at a constant pH value, for example, around pH 2.0. (See, for example, Patent Document 1).

Further, as an acid treatment ship for a small seaweed net, an acid treatment ship using a box-shaped ship is known. As an acid treatment ship for this small seaweed net, for example,
1) An acid treatment tank equipped with a seaweed net hoisting device for hoisting seaweed nets from the sea, a chemical liquid circulation device for circulating chemicals, and concentration detection for detecting the concentration of chemicals circulated by the chemical circulation device. A seaweed net acid treatment vessel having an apparatus (see, for example, Patent Document 2),
2) The nori net containing an active treatment agent tank containing an active treatment agent for activating the seaweed net stretched on the seaweed farm and treated water in which the active treatment agent and water are mixed. A seaweed net activation treatment agent supply device (for example, Patent Document) comprising a treatment tank in which the activation treatment of Nori seaweed is performed and a means for supplying the activation treatment agent from the activation treatment agent tank to the treatment tank via a supply pipe (for example, Patent Document). 3)
3) As a box-shaped ship capable of maintaining the acid-treated liquid at a desired pH value, an acid-treated tank for storing the acid-treated liquid and a seaweed net provided in the acid-treated tank to which seaweed adheres are wound. A box-shaped ship equipped with a pair of take-up rolls, which interferes with a pH sensor provided in the acid treatment tank to detect the pH of the acid treatment liquid and the seaweed net wound on the take-up roll. It is provided with a stock solution discharge unit that is provided at a position where the acid stock solution is not discharged, and a stock solution supply device that automatically adjusts the supply amount of the acid stock solution to be supplied to the stock solution discharge unit based on the detection value of the pH sensor. The undiluted solution discharge portion is provided between the pair of winding rolls, and has a rod-shaped member provided above the acid-treated tank so as to face the liquid surface of the acid-treated solution, and the acid-treated rod-shaped member. A sheet member that hangs down toward the liquid surface and a plurality of discharge holes that are provided along the rod-shaped member on both sides of the sheet member and discharge the acid stock solution toward the sheet member are formed at predetermined intervals. A box-shaped ship characterized by having a tubular member (see, for example, Patent Document 4),
4) With an acid treatment tank that stores the acid treatment solution in which the acid stock solution is diluted in order to prevent the acid stock solution and the acid treatment solution having a concentration higher than the desired concentration from coming into contact with the seaweed net in the acid treatment of the seaweed net. A box-shaped ship provided in the acid treatment tank and equipped with a take-up roll for winding up a seaweed net to which seaweed is attached, a flexible sheet that hangs away from the take-up roll and hangs down, and the flexible sheet. The surface of the sex sheet is provided with an acid stock solution discharge unit for discharging the acid stock solution, and the acid stock solution supply unit is provided with the acid stock solution flowing down the surface of the flexible sheet and supplied to the acid treatment tank. When the acid treatment tank is tilted so that the lower end of the flexible sheet approaches the take-up roll, the acid stock solution supply unit is more than the lower end of the flexible sheet at the liquid level of the acid treatment liquid. A box-shaped ship characterized by supplying the acid stock solution to a position far from the take-up roll (see, for example, Patent Document 5).
Etc. are known.

In the acid treatment ship or the like of the seaweed net of Patent Documents 1 to 5, the pH value of the acid treatment liquid in the acid treatment tank having a constant capacity is detected, and the pump or the like of the supply device is operated based on the detected value. An acid treatment liquid (acid stock solution, etc.) in the treatment tank is supplied to the acid treatment tank via a supply pipe or a tubular member having a discharge hole, and the acid treatment liquid in the acid treatment tank has a constant pH value, usually pH 2. It was held around 0.0.
However, since the supply pipes and tubular members used in the above Patent Documents 1 to 5 are mainly diverted from vinyl chloride water pipes and the like, their inner diameter is as large as 13 mm or more, and the supply pipes and the like. The hole diameters of the discharge holes formed in the tubular member were the same, and the distances (distances) between the discharge holes were also the same. Therefore, a part of the acid stock solution supplied from the supply pump may remain in the supply pipe or tubular member and may not drop to the set pH value, and the set pH value and the actual pH value in the acid treatment tank may be reached. There is a problem that sufficient acid treatment cannot be performed efficiently due to the deviation from the above.

Further, in the acid treatment ship of the seaweed net of Patent Documents 4 and 5, since the acid stock solution is further discharged toward the sheet member, the acid stock solution remains in the tubular member and also on the sheet member having a large surface area. Since a part of the pH is left behind due to adhesion, the difference between the set pH value and the actual pH value in the acid treatment tank is even larger, and there is a problem that sufficient acid treatment cannot be performed efficiently. ing.

Japanese Patent Application Laid-Open No. 5-95740 (Claims, FIG. 1, etc.) Utility Model Registration No. 3212304 (Claims for Utility Model Registration, Figure 1, etc.) Utility Model Registration No. 3210762 (Claims for Utility Model Registration, Figure 1, etc.) Japanese Patent No. 6161016 (Claims, FIGS. 1, 2, etc.) Japanese Patent No. 6218984 (Claims, FIGS. 1 to 4, etc.)

The present invention is intended to solve the above-mentioned conventional problems, and is to treat nori such as diatoms and red rot bacteria adhering to the nori net during cultivation with an acid treatment agent (liquid). In the acid treatment ship of the net, sufficient acid treatment is performed by minimizing the deviation between the set pH value and the actual pH value in the acid treatment tank and preventing the concentration unevenness in the acid treatment tank from occurring. The purpose is to provide an acid treatment ship for seaweed nets that can be performed efficiently.

As a result of diligent studies on the above-mentioned conventional problems, the present inventors have at least an acid treatment tank for accommodating an acid treatment liquid, and an acid stock solution supply device for supplying a stock solution of the acid treatment liquid into the acid treatment tank. A seaweed net provided with a control unit that detects the pH value of the acid treatment liquid in the acid treatment tank, operates the acid stock solution supply device based on the detected value, and controls the acid treatment liquid to a constant pH value. In the acid treatment vessel of the above, the acid stock solution supply device is provided with at least one bottomed tubular tubular member having a plurality of discharge holes for ejecting the acid stock solution at an arbitrary position on the acid treatment tank. By setting the inner diameter of the tubular member, the number of discharge holes, the hole diameter of the discharge holes, and the ratio of the hole diameter of the last discharge hole to the hole diameter of the first discharge hole within a specific range, the seaweed net can be prepared. They found that an acid-treated ship could be obtained, and completed the present invention.

That is, it exists in the following (1) to (6).
(1) At least, the acid treatment tank containing the acid treatment liquid, the acid stock solution supply device for supplying the stock solution of the acid treatment liquid into the acid treatment tank, and the pH value of the acid treatment liquid in the acid treatment tank are detected. The acid stock solution supply device is a seaweed net acid treatment ship equipped with a control unit that operates the acid stock solution supply device based on the detected value to control the acid treatment liquid to a constant pH value. Is provided with at least one bottomed tubular member having a plurality of discharge holes for ejecting the acid stock solution at an arbitrary position on the acid treatment tank, and the tubular member has an inner diameter of 3 to 8 mm. A seaweed net acid treatment vessel, characterized in that the number of discharge holes is 3 to 10, and the hole diameter of the discharge holes is 1.0 to 2.0 mm.
(2) The acid of the seaweed net according to (1) above, wherein the ratio of the hole diameter of the last discharge hole to the hole diameter of the first discharge hole of the tubular member is 1.08 to 1.27 times. Processing ship.
(3) When the number of discharge holes (a) of the tubular member is 4 or more, the distance between the first discharge hole and the second discharge hole (X ₁ ) and one before the last discharge hole. The distance between the discharge hole and the last discharge hole is the same (X ₁ = X _a-1 , a is the number of discharge holes), and the second discharge hole (X ₂ ) is discharged immediately before the last discharge hole. The acid-treated seaweed net according to (1) or (2) above, wherein the intervals between the holes (X _a-1 ) are the same (X ₂ = X ₃ = ...).
(4) Described in any one of (1) to (3) above, wherein the nori net acid treatment vessel is provided with a winding roll for winding the nori net in the acid treatment tank. Nori seaweed net acid treatment ship.
(5) The acid treatment ship of the seaweed net has a support member suspended from the central portion of the acid treatment tank and a sheet-like member hanging from the support member to the acid treatment liquid of the acid treatment tank. The acid-treated seaweed net according to any one of (1) to (4) above, wherein the tubular member is provided on one side or both sides of the sheet-shaped member.
(6) The acid of the seaweed net according to any one of (1) to (5) above, wherein a flexible tube having visibility is attached to each discharge hole of the tubular member. Processing ship.

According to claims 1 and 2 of the present invention, the inner diameter of the tubular member that supplies the acid stock solution, the number of discharge holes, the hole diameter of the discharge hole, and the ratio of the hole diameter of the last discharge hole to the hole diameter of the first discharge hole are determined. By setting each specific range, it is sufficient to minimize the deviation between the set pH value and the actual pH value in the acid treatment tank and prevent the concentration unevenness in the acid treatment tank from occurring. An acid treatment vessel for seaweed nets that can efficiently perform acid treatment is provided.
According to the invention of claim 3, an acid treatment vessel of a seaweed net capable of more efficiently performing sufficient acid treatment by further minimizing the deviation between the set pH value and the pH value in the actual acid treatment tank. Provided.
According to the inventions of claims 4 and 5, sufficient acid treatment can be efficiently performed even on an acid treatment ship of a seaweed net having various devices (winding rolls, sheet-shaped members).
According to the sixth aspect of the present invention, there is provided a seaweed net acid treatment vessel capable of reliably supplying an acid stock solution into an acid treatment tank and efficiently performing sufficient acid treatment.

It is a drawing of the acid treatment ship of the seaweed net which shows 1st Embodiment of this invention, (a) is a schematic plan view, (b) is a schematic front view. (A) is a drawing seen from the bottom surface side showing an example of a tubular member used for the acid treatment ship of the seaweed net of FIG. 1, and (b) is a schematic side view of FIG. 1 (b). (A) is a drawing seen from the bottom surface side showing an example of the comparative form of the tubular member used for the acid treatment ship of the seaweed net of FIG. 1, and (b) to (d) are the acid treatment of the seaweed net of FIG. It is each drawing seen from the bottom side which shows the other example of the tubular member used for a ship. It is a drawing of the acid treatment ship of the seaweed net which shows the 2nd Embodiment of this invention, (a) is a schematic front view, (b) is a schematic side view of (a), (c) is a tubular member and flexibility. It is a schematic drawing which shows an example of the attachment state with a tube. It is a drawing of the acid treatment ship of the seaweed net which shows the 3rd Embodiment of this invention, (a) is a schematic front view, (b) is a schematic side view of (a). It is a schematic plan view of the acid processing ship of the seaweed net which shows the 4th Embodiment of this invention. It is a drawing of the acid treatment ship of the seaweed net which shows the 5th Embodiment of this invention, (a) is a schematic plan view, (b) is a schematic side view which shows an example of the embodiment. It is a layout drawing which arranged 5 handy pH meters for measurement in test 2 so as to cover the acid treatment tank of the acid treatment ship of a seaweed net.

Hereinafter, each embodiment of the present invention will be described in detail.
1A and 1B are drawings of an acid-treated seaweed net showing the first embodiment of the present invention, FIG. 1A is a schematic plan view, FIG. 1B is a schematic front view, and FIG. 2A is a seaweed of FIG. A drawing seen from the bottom surface side showing an example of a tubular member used for an acid treatment ship of a net, (b) is a schematic side view of FIG. 1 (b).
As shown in FIGS. 1 (a) and 1 (b), the acid-treated ship A of the seaweed net of the first embodiment is contained in at least a resin-made ship body 10 made of fiber-reinforced plastic such as FRP. , The acid treatment tank 15 for accommodating the acid treatment liquid 11, the winding roll 20 for winding the seaweed net (not shown) provided in the acid treatment tank 15, and the central portion of the acid treatment tank 15. A support member 25, a sheet-shaped member 30 hanging from the support member 25 toward the acid treatment liquid 11 of the acid treatment tank 15, and an acid stock solution Z of the acid treatment liquid 11 are supplied into the acid treatment tank 15. The pH values of the acid stock solution supply device 40 and the acid treatment liquid 11 in the acid treatment tank 15 are detected, and the acid stock solution supply device 40 is operated based on the detected values to keep the acid treatment liquid 11 at a constant pH value. It is provided with a control unit 50 for controlling.

The acid treatment solution 11 is an acid stock solution such as an organic acid such as citric acid or malic acid [a commercially available acid treatment agent (liquid) if there is a commercially available product, in this embodiment, “Grogen” manufactured by Daiichi Netsui Co., Ltd.]. Z is diluted with seawater or the like, and is an acid diluted solution having a predetermined pH value, for example, pH 1.7 to 2.3.
A certain amount (500 to 1,000 L) of the acid-treated liquid 11 is contained in the acid-treated tank 15, and the seaweed attached to the seaweed net by dipping the seaweed net (not shown) to be wound up. Is acid-treated.

The acid treatment tank 15 is a rectangular concave body formed in the center of the ship body 10, and accommodates a predetermined amount of the acid treatment liquid 11. In the spaces 16 and 16 on both sides of the acid treatment tank 15, an acid stock solution supply device 40, a control unit 50, a drive unit 22 such as a take-up roll, a battery (not shown) for driving these, and the like are arranged. It is a space for workers to work.

The take-up roll 20 is a rotation axis for winding the seaweed net, and has at least one. In the present embodiment, a pair of take-up rolls 20 are arranged at predetermined positions in the acid treatment tank 15. The take-up rolls 20 and 20 are rotatably attached, and one take-up roll 20 sequentially winds the front seaweed net when the ship body 10 moves forward (upper side in FIG. 1). On the other hand, the take-up roll 20 sequentially winds the rear seaweed net when the ship body 10 moves backward (lower side in FIG. 1). Further, in the present embodiment, feeding rolls 21 and 21 which serve as rotation axes for feeding the seaweed net to the sea side are rotatably attached to both sides of the support member 25.
The pair of winding rolls 20 and the feeding rolls 21 arranged on both sides of the support member are driven by the driving units 22 and 22 having an operating device provided in the space 16.

The support member 25 is composed of a rod-shaped member and is suspended in the central portion in the width direction of the acid treatment tank 15, and is interposed on the upper surface portions on both sides of the acid treatment tank 15 via mounting members (not shown). Or directly fixed.
A resin sheet-like member 30 hanging toward the acid treatment liquid 11 of the acid treatment tank 15 and a soft vinyl chloride sheet-like member 30 in the present embodiment are attached to the support member 25 for acid treatment. It is arranged up to the vicinity of the bottom in the acid treatment liquid 11 of the tank 15. A rod-shaped member 31 that serves as a weight (sinker) is attached to the bottom of the sheet-shaped member 30.
The sheet-shaped member 30 is a member (curtain) for preventing entanglement due to direct contact between the seaweed nets wound on the take-up roll 20 or the feeding roll 21 arranged on both sides of the sheet-shaped member 30. .. Therefore, it is preferable that the lower portion of the sheet-shaped member 30 is arranged up to the vicinity of the bottom portion in the acid treatment liquid 11 of the acid treatment tank 15.

As shown in FIG. 1A, the acid stock solution supply device 40 is separated from the acid treatment tank at an appropriate position of the space 16 of the acid treatment tank 15 (to the extent that it does not interfere with the winding and feeding of the seaweed net, and interferes with the work. It is arranged in the space under the worker's simple seat, for example, and supplies the acid stock solution Z of the acid treatment liquid 11 into the acid treatment tank 15. In the present embodiment, the acid stock solution supply device 40 is connected to the stock solution tank 41 accommodating the acid stock solution Z of the acid treatment liquid 11 from the stock solution tank 41 via a line 43 via a pump 42.
The control unit 50 places the acid treatment liquid 11 at an appropriate position in the acid treatment tank 15 (at the center position where the average pH of the acid treatment tank can be detected and is not interfered with by the brewing roll, for example, in the vicinity of the sheet-like member). It has a pH detector 51 that detects a pH value, and operates the pump 42 of the acid stock solution supply device 40 based on the detection value detected by the pH detector 51 to enter the acid of the acid treatment liquid into the acid treatment tank 15. It is a device for supplying the undiluted solution Z to control the acid treatment solution 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 detection value of the pH detector 51.

A resin tubular member 60 and, in the present embodiment, an FRP tubular member 60 are attached to both sides of the upper portion of the sheet-shaped member 30 by attachments 26 such as a binding band in the vicinity of the support member 25.
As shown in FIGS. 1 (b) and 2 (a) and 2 (b), the acid stock solution Z is supplied to the tubular member 60 from one opening 60a, and the plug member 60c is supplied to the other end 60b. Is fixed, and a plurality of discharge holes 61a, 61b ... For dropping the acid stock solution, and five discharge holes 61a to 61e in the present embodiment are provided in the lower portion (bottom side) of the tubular member 60.
The tubular member 60 used in the present invention is not particularly limited as long as it is made of FRP or has acid resistance, weather resistance, durability, etc. with respect to the acid stock solution Z, and is made of vinyl chloride (hereinafter, simply referred to as “simply”). , "PVC", etc.), opaque (the acid stock solution cannot be confirmed with the naked eye), and visible (the acid stock solution can be confirmed with the naked eye). If it is transparent or translucent, the feeding state of the acid stock solution can be visually confirmed.

In the present invention, the residual leakage and void loss in the tubular member 60 of the acid stock solution are extremely reduced to eliminate the difference in response time between the start and stop of the pump and the discharge hole ejection, and the set pH value and the actual acid treatment tank are used. It is necessary that the inner diameter of the tubular member 60 is 3 to 8 mm and the number of discharge holes is 3 in order to minimize the deviation from the pH value of the above and enable sufficient acid treatment efficiently. It is necessary that the number is ~ 10, and the hole diameter (diameter) of the discharge holes is 1.0 to 2.0 mm. Then, in order to adjust the ejection amount balance of the plurality of discharge holes and further eliminate the concentration unevenness in the acid treatment tank, the inner diameter of the tubular member 60 is preferably set to 3 to 5 mm, and the hole diameter of the first discharge hole 61a is set. On the other hand, it is desirable that the ratio of the hole diameters of the final discharge holes 61e is 1.08 to 1.27 times.
Here, the inner diameter of the tubular member 60 refers to the diameter of the portion where the liquid (acid stock solution) actually flows, which is obtained by subtracting the thickness of the pipe from the diameter (outer diameter) of the tubular member 60 [FIG. 2 (FIG. 2). The illustrated reference numeral D] in a). Further, the cross section of the tubular member 60 perpendicular to the longitudinal direction is preferably circular. When the vertical cross section is elliptical, the inner diameter of the tubular member 60 refers to the longest straight line drawn so as to pass through the center of the vertical cross section of the tubular member. Further, it is preferable that the tubular member has a shape in which the inner diameter does not change in the longitudinal direction.
Since the length of the tubular member 60 is arranged at an arbitrary position on the acid treatment tank 15 at a location that does not interfere with the winding and feeding of the seaweed net, it depends on the size of the acid treatment tank 15 and the like. Although it varies, it may be the same as the length in the width direction of the acid treatment tank 15, or slightly longer or slightly shorter in consideration of the mounting mode. In the present embodiment, the length of the acid treatment tank 15 in the width direction is 210 cm, and the length of the tubular member 60 is 190 cm. Further, the outer diameter of the tubular member 60 is preferably 8 to 13 mm.

The inner diameter of the tubular member 60 is preferably 3 to 8 mm, preferably 3 to 7 mm, and more preferably 3 to 5 mm. If the inner diameter of the tubular member 60 exceeds 8 mm, the residual leakage of the acid stock solution in the tubular member 60 and the amount of voids increase, so that the set pH value and the actual pH value in the acid treatment tank deviate from each other. On the other hand, if the inner diameter is less than 3 mm, it becomes difficult to reduce the ejection amount (total amount) and adjust the ejection amount balance of the plurality of discharge holes, which is not preferable.
Further, the number of discharge holes 61 formed in the tubular member 60 varies depending on the length of the tubular member 60, that is, because it is arranged on the acid treatment tank 15, the size of the acid treatment tank 15 and the like. The number is 3 to 10 (per tubular member), preferably 3 to 6, and particularly preferably 5 to 6. When the number of the discharge holes 61 is 2 or less, there are few places to discharge (including dropping) to the acid treatment tank 15, it takes time to dissolve in the acid treatment tank 15, and concentration unevenness occurs. If the number exceeds 10, the adjustment of the ejection amount balance of the plurality of discharge holes becomes complicated, which is not preferable.
Further, if the hole diameter of the discharge hole is less than 1.0 mm, the ejection amount (total amount) is reduced and the tubular member 60 cannot be uniformly distributed to the discharge holes 61, 61 ... On the other hand, if the hole diameter of the discharge hole exceeds 2.0 mm, the pressure in the pipe tends to be insufficient, and the pressure can be distributed to the discharge holes 61, 61 ... Of the tubular member 60 with a stable pressure. However, it causes uneven concentration in the acid treatment tank, which is not preferable.
The ratio of the hole diameter of the last discharge hole 61e to the hole diameter of the first discharge hole 61a may be the same, but if it is less than 1.08 times, the ejection amount of the last discharge hole 61e becomes slightly too small. On the other hand, if the ratio of the hole diameters exceeds 1.27 times, the amount of ejection from the final discharge hole 61e becomes slightly excessive.
The relationship between the inner diameter, the number of discharge holes, the hole diameter, the ratio of the hole diameters, and the like will be described in detail in Examples and the like described later.

The interval (distance) between the discharge holes 61a, 61b ... Of the tubular member 60 may be a predetermined interval, but when the number of discharge holes is 4 or more, the acid stock solution is more uniformly discharged (including dropping). Therefore, the distance between the first discharge hole and the second discharge hole (X ₁ ) is the same as the distance between the discharge hole immediately before the last discharge hole and the last discharge hole (X ₁ = X _a-1 ). , A is the number of discharge holes), and the distance between the second discharge hole (X ₂ ) and the discharge hole (X _a-1 ) immediately before the last discharge hole is the same (X ₂ = X ₃ =). ...).
In the present embodiment, as shown in FIG. 2A, the acid stock solution is further uniformly distributed from the discharge holes 61a to 61e in consideration of the pressure (water pressure) of the pump 42 of the acid stock solution Z and the length of the tubular member. The distance (length) between the discharge holes 61a, 61b ... Is varied from the point of discharging (including dropping), and the distance (X ₁ ) between the first discharge hole 61a and the second discharge hole 61b is determined. The distance (X ₄ ) between the discharge hole 61d immediately before the last discharge hole and the last discharge hole 61e is the same, and the discharge hole immediately before the last discharge hole from the second discharge hole (X ₂ ) It is desirable that each interval of each interval (X ₃ ) is the same (X ₂ = X ₃ ).

In the present embodiment, the tubular member 60 has a length (total length X: one end to the other end, the same applies hereinafter) of 190 cm, an inner diameter of 3 mm, an outer diameter of 8 mm, and five discharge holes 61a to 61e. The distance (distance X ₀ ) to the first discharge hole 61a (center, the same applies hereinafter) is 35 cm, the distance (distance X ₁ ) between the first discharge hole 61a and the next discharge hole 61b is 40 cm, and the next discharge The distance between the holes 61c and 61d (distance X ₂ , distance X ₃ ) is 20 cm each, the distance to the next discharge hole 61e (distance X ₄ ) is 40 cm, and the hole diameters of the discharge holes 61a to 61d are 1. The hole diameter of the final discharge hole 61e is 1.9 mm (1.27 times).
The inner diameter of these tubular members 60, the distance (distance) between the discharge holes 61a to 61e, the hole diameter (hole size) of each discharge hole, the number thereof, etc. are the size, shape, and pump of the acid treatment tank 15. It can be varied in each of the above ranges depending on the species and the like. The length (X ₀ ) from the end portion which is the inlet of the tubular member 60 to the first discharge hole varies depending on the size of the treatment tank and the mounting mode, but is 0.12 X to 0. It is preferably 25X.

The acid treatment work of the seaweed net by the acid treatment ship of the seaweed net of the first embodiment described in this way will be described below. Since the case where the ship body 10 moves forward and the case where the ship body 10 moves backward are the same, in the present embodiment, only the case where the ship body 10 moves forward (upper side of FIG. 1) will be described.
Nori net acid treatment After moving the Nori net cultivating seaweed net to the sea where the seaweed net is installed, the ship body 10 is advanced by the force of winding the seaweed net, and as it moves forward, the seaweed net is treated with acid. The seaweed net that has invaded the tank 15 from the front and has invaded is sequentially taken up by the take-up roll 20 by rotating the take-up roll 20 by the drive of the drive unit 22. The rolled seaweed net is immersed in the acid treatment liquid 11 contained in the acid treatment tank 15, and the seaweed is acid-treated.
In the acid treatment tank 15, the pH of the acid treatment liquid 11 is detected by the pH detector 51, and the detection value detected by the pH detector 51 is output to the control unit 50. The control unit 50 feedback-controls the pump 42 of the acid stock solution supply device 40 based on the detection value input from the pH detector 51 and the preset control threshold value. Based on the operation signal input from the control unit 50, the pump 42 sucks out a predetermined amount of the acid stock solution Z corresponding to the operation signal from the acid stock solution tank 41 and supplies it to the tubular members 60 and 60 by the line 44. Further, the control unit 50 can control the pump 42 to automatically adjust the supply amount of the acid stock solution Z to be supplied to the acid treatment liquid 11 based on the detection value of the pH detector 51.

The acid stock solution Z sucked out from the acid stock solution tank 41 by the pump 42 that received the operation signal from the pH detector 51 is supplied to the tubular members 60, 60, and a plurality of discharges provided in the tubular members 60, 60. It is discharged (dropped) into the acid treatment liquid 11 from the holes 61a, 61b. The acid stock solution Z dropped into the acid treatment liquid 11 is immediately dissolved in the acid treatment liquid 11. The solubility of the acid stock solution Z is that the acid stock solution Z is water-soluble, and the acid treatment solution 11 is in a stirred state due to the circulation generated in the acid treatment solution 11 due to the shaking of the ship body 10, the rotation of the take-up roll 20, and the like. As a result, it dissolves and diffuses in the acid-treated liquid 11 diluted with seawater in the acid treatment, whereby the pH value that fluctuates to a high value in the acid-treated liquid 11 can be set to a predetermined pH value. The display of the pH value can also be confirmed on a waterproof pH display liquid crystal screen or the like (not shown) provided in the control unit 50.
The seaweed net to which the acid-treated cultured seaweed is attached is wound on the take-up roll 20 and then further wound on the manipulating roll 21, and after being acid-treated, the seaweed net wound on the feeding roll 21 is formed. As the ship body 10 moves forward, it will be installed in the place where the seaweed net that has been unwound and wound out of the ship body 10 has been installed.

According to the acid treatment vessel A of the seaweed net of the first embodiment configured as described above, the acid stock solution supply device 40 has a plurality of discharge holes for discharging the acid stock solution Z provided in the vicinity of the support member 25. The tubular members 60, 60 having 61a, 61b ... Are provided, and the inner diameter of the tubular member 60, the number of discharge holes 61a ..., and the hole diameter of the discharge holes 61a ... The deviation between the pH value obtained and the actual pH value in the acid treatment tank is minimized, and an acid treatment vessel of a seaweed net capable of efficiently performing sufficient acid treatment can be obtained. Preferably, in addition to the above conditions, the ratio of the hole diameter of the last discharge hole 61e to the hole diameter of the first discharge hole 61a is set within the range of the specific ratio (1.08 to 1.27 times). Further, the deviation between the set pH value and the actual pH value in the acid treatment tank is extremely minimized, and a seaweed net acid treatment vessel capable of performing sufficient acid treatment more efficiently can be obtained.

As described above, the tubular member 60 used in the present invention needs to have an inner diameter of 3 to 8 mm, a number of discharge holes of 3 to 10, and a hole diameter of 1.0 to 2.0 mm. As a more preferable form, by setting the ratio of the hole diameter of the last discharge hole to the hole diameter of the first discharge hole to 1.08 to 1.27 times, residual leakage or voids of the acid stock solution in the tubular member 60 By extremely reducing the loss, the difference in response time between the start and stop of the pump and the discharge hole ejection is eliminated, the deviation between the set pH value and the actual pH value in the acid treatment tank is minimized, and in the acid treatment tank. Sufficient acid treatment can be performed more efficiently by preventing the concentration unevenness of the above.

3 (b) to 3 (d) are drawings seen from the bottom surface side showing another example of the tubular member 60 used in the acid-treated ship of the seaweed net of the above embodiment. Note that FIG. 3A is a comparative drawing.
FIG. 3A shows a tubular member 60 (FRP material) having a length of 200 cm, an inner diameter of 3 mm, an outer diameter of 8 mm, two discharge holes 61a and 61b, and a distance to the first discharge hole 61a. (Distance X ₀ ) is 70 cm, the distance between the first discharge hole 61a and the next discharge hole 61b (distance X ₁ ) is 60 cm, the hole diameter of the discharge hole 61a is 1.2 mm, and the last discharge hole 61b. The hole diameter is 1.5 mm (1.25 times).
FIG. 3B shows a tubular member 60 (FRP material) having a length of 200 cm, an inner diameter of 3 mm, an outer diameter of 8 mm, three discharge holes 61a to 61c, and an interval to the first discharge hole 61a. (Distance X ₀ ) is 50 cm, the distance between the first discharge hole 61a and the next discharge hole 61b (distance X ₁ ) is 50 cm, and the distance between the next discharge hole 61c (distance X ₂ ) is 50 cm. The hole diameters of the discharge holes 61a to 61b are 1.2 mm, and the hole diameter of the final discharge hole 61c is 1.5 mm (1.25 times).
FIG. 3C shows a tubular member 60 (FRP material) having a length of 200 cm, an inner diameter of 3 mm, an outer diameter of 5 mm, six discharge holes 61a to 61f, and an interval to the first discharge hole 61a. (Distance X ₀ ) is 25 cm, the distance between the first discharge hole 61a and the next discharge hole 61b (distance X ₁ ) is 30 cm, and the distance between the next discharge holes 61c, 61d, 61e (distance X ₂ , distance X ₃ ). , The distance X ₄ ) is 30 cm each, the distance to the next discharge hole 61f (distance X ₅ ) is 30 cm, the hole diameters of the discharge holes 61a to 61e are 1.2 mm, and the hole diameter of the last discharge hole 61f is 1. It is .2 or 1.3 or 1.5 or 1.6 mm (1.00 or 1.08 or 1.25 or 1.33 times).
FIG. 3D shows a tubular member 60 (transparent vinyl chloride material) having a length of 200 cm, an inner diameter of 5 mm, an outer diameter of 10 mm, six discharge holes 61a to 61f, and up to the first discharge hole 61a. The distance (distance X ₀ ) is 25 cm, the distance between the first discharge hole 61a and the next discharge hole 61b (distance X ₁ ) is 30 cm, and the distance between the next discharge holes 61c, 61d, 61e (distance X ₂ , distance). X ₃ and distance X ₄ ) are 30 cm each, the distance to the next discharge hole 61f (distance X ₅ ) is 30 cm, the hole diameters of the discharge holes 61a to 61e are 1.8 mm, and the hole diameter of the last discharge hole 61f. Is 2.0 or 2.1 [comparative form] mm (1.11 or 1.17 times).

FIG. 4 is a drawing showing a main part of an acid treatment ship of a seaweed net showing a second embodiment of the present invention. In the following second to fifth embodiments, the same configurations as those in the first embodiment show the same reference numerals in the drawings, and the description thereof will be omitted.
In the seaweed net acid treatment vessel B according to the second embodiment of the present invention, the acid stock solution Z discharged from the discharge holes 61a to 61e of the tubular member 60 is subjected to the acid treatment liquid 11 in the discharge holes 61a to 61e. Flexible tubes 62, 62 ... Made of resin, elastomer, or rubber that lead to the liquid surface of the above can be attached by fixing, welding, attachment, or the like.
As shown in FIG. 4A, the length of the flexible tubes 62, 62 ... With visibility is the case where the length (distance) from the lower portion of the tubular members 60, 60 to the liquid level Y is W. In addition, the length of the tubes 62a, 62a ... Of the present embodiment is 2/3 W, and if this length is used, the acid stock solution Z discharged from the flexible tubes 62a, 62a ... With visibility is a sheet-like member. It will be dropped into the acid treatment liquid without further adhering to 30.

Further, the flexible tubes 62, 62 ... may be transparent or translucent as long as they have visibility (the acid stock solution can be confirmed with the naked eye), and if they are transparent or translucent, they are flexible. The dropping of the acid stock solution Z in the sex tube can be visually confirmed. Further, the flexible hole diameter (inner diameter) having visibility is the same as or larger than the hole diameter of the discharge holes 61a to 61e61, and in the present embodiment, the inner diameter is 6 mm, and the transparent visibility made of vinyl chloride. It is composed of a flexible tube having a property.

Also in the second embodiment, as in the first embodiment, the pH value of the acid-treated solution, which has changed to a high value due to the acid-treating operation by the operation of the acid stock solution supply device 40, the control unit 50, etc., is set to a predetermined pH. The value can be automatically adjusted, and the inner diameter of the tubular member 60, the number of discharge holes 61a ..., the hole diameter of the discharge holes 61a ..., and the hole diameter of the first discharge hole 61a of the last discharge hole 61e. By setting the ratio of the pore diameters to each of the above specific ranges, the deviation between the set pH value and the actual pH value in the acid treatment tank is minimized, and the concentration unevenness in the acid treatment tank does not occur. Therefore, sufficient acid treatment can be efficiently performed. Further, in the present embodiment, since the acid stock solution Z is not discharged to the sheet-shaped member 30, the acid stock solution Z does not adhere to the sheet-shaped member 30, and the rolled seaweed net is transferred to the sheet-shaped member 30. An acid treatment ship for seaweed nets that does not come into contact with the remaining acid stock solution, does not splash the acid stock solution, can reliably acidify the seaweed net with the acid treatment liquid, and does not waste the acid stock solution. Will be obtained.
In the second embodiment, the length of the flexible tubes 62a, 62a ... Having visibility is set to 2/3 W, but the attachment position of the tubular members 60, 60 is the acid stock solution discharged to the sheet-shaped member 30. If it is attached to a place where Z cannot adhere, it may be 1/3 W of the length to the liquid surface of the acid treatment liquid, and the length W of the flexible tubes 62a, 62a ... Having visibility may be. It may be the length until it comes into contact with the liquid surface, and the length may be such that it penetrates into the acid-treated liquid 11 below the liquid level Y.

FIG. 5 is a drawing showing a main part of an acid treatment ship of a seaweed net showing a third embodiment of the present invention.
In the seaweed net acid treatment vessel C according to the third embodiment of the present invention, the tubular members 60, 60 provided with a plurality of discharge holes 61a, 61b ... For discharging the acid stock solution are in the vicinity of the liquid level Y of the acid treatment liquid. Specifically, it is provided above the liquid level Y by 1 to 15 cm. In the present embodiment, it is provided above the liquid level Y 5 cm.
Also in the third embodiment, as in the first embodiment, the pH value of the acid-treated solution, which has changed to a high value due to the acid-treating operation by the operation of the acid stock solution supply device 40, the control unit 50, etc., is set to a predetermined pH. The value can be automatically adjusted, and the inner diameter of the tubular member 60, the number of discharge holes 61a ..., the hole diameter of the discharge holes 61a ..., and the last discharge hole 61e with respect to the hole diameter of the first discharge hole 61a. By setting the ratio of the pore diameters in each of the above specific ranges, the deviation between the set pH value and the actual pH value in the acid treatment tank is minimized, and the concentration unevenness in the acid treatment tank does not occur. In this way, an acid treatment vessel with a seaweed net that can efficiently perform sufficient acid treatment can be obtained. Further, since the tubular members 60, 60 provided with the discharge holes 61a, 61b ... for discharging the acid stock solution are provided in the vicinity of the liquid level Y of the acid treatment liquid, the discharge holes 61a, 61b of the tubular members 60, 60 are provided. The discharge of ... can be confirmed with the naked eye, the acid stock solution does not adhere to the sheet-shaped member 30, and the rolled seaweed net does not come into contact with the acid stock solution remaining on the sheet-shaped member 30. It is possible to obtain an acid-treated seaweed net that can reliably acid-treat the net with an acid-treated liquid.

FIG. 6 is a drawing showing a main part of an acid treatment ship of a seaweed net showing a fourth embodiment of the present invention.
The seaweed net acid treatment vessel D according to the fourth embodiment of the present invention is in the case where the sheet-like member 30 does not exist, and the support members 26 and 26 provided at both end portions of the acid treatment tank 15 have the above-mentioned first. Tubular members 60, 60 having discharge holes 61a to 61e similar to those of the first embodiment are attached, and are different from the first embodiment.
Also in the fourth embodiment, the pH value of the acid-treated solution, which has changed to a high value due to the acid treatment operation, can be automatically adjusted to a predetermined pH value by operating the acid stock solution supply device 40, the control unit 50, and the like. Further, the ratio of the inner diameter of the tubular member 60, the number of discharge holes 61a ..., the hole diameter of the discharge holes 61a ..., and the hole diameter of the first discharge hole 61a to the hole diameter of the last discharge hole 61e is the first embodiment. By setting each specific range described in detail in the above section, the deviation between the set pH value and the actual pH value in the acid treatment tank is minimized, and the concentration unevenness in the acid treatment tank is prevented from occurring. As a result, an acid treatment vessel with a seaweed net that can efficiently perform sufficient acid treatment can be obtained.

FIG. 7 is a drawing showing a main part of an acid treatment ship of a seaweed net showing a fifth embodiment of the present invention.
The seaweed net acid treatment vessel E according to the fifth embodiment of the present invention is applied to a pass-through acid treatment vessel not provided with a take-up roll, and is a support member 26 provided at the advancing side end of the acid treatment tank 15. A tubular member 60 [FIGS. 2 (a), 3 (b) to (d), etc.] having discharge holes 61a, 61b ... Similar to that of the first embodiment is attached to the surface.
Also in the fifth embodiment, the pH value of the acid-treated solution, which has changed to a high value due to the acid treatment operation, can be automatically adjusted to a predetermined pH value by operating the acid stock solution supply device 40, the control unit 50, and the like. Further, the ratio of the inner diameter of the tubular member 60, the number of discharge holes 61a ..., the hole diameter of the discharge holes 61a ..., and the hole diameter of the last discharge hole 61c or f to the hole diameter of the first discharge hole 61a is the first. By setting each specific range described in detail in the embodiment, the deviation between the set pH value and the actual pH value in the acid treatment tank is minimized, and the concentration unevenness in the acid treatment tank does not occur. In this way, an acid treatment vessel with a seaweed net that can efficiently perform sufficient acid treatment can be obtained.

The acid treatment work (passing treatment) of the seaweed net by the acid treatment ship of the seaweed net according to the fifth embodiment described in this manner will be described below [FIG. 7 (b)].
After moving the seaweed net acid treatment ship E to the sea where the seaweed net N cultivating is installed, the seaweed net guide 71 is submerged under the seaweed net N to move the ship body 10 (progress shown in the figure). When the seaweed net N is advanced by the driving force of the outboard unit 70 (in the direction), the seaweed net N invades the acid treatment tank 15 from the front as it advances, and the invaded seaweed net N is made of vinyl chloride or the like and has a bottomed cylindrical shape at both ends. The seaweed is acid-treated by passing under the floating body (commonly known as "coro") 72 and being immersed in the acid-treated liquid 11 contained in the acid-treating tank 15.
In the acid treatment tank 15, the pH of the acid treatment liquid 11 is detected by the pH detector 51, and the detection value detected by the pH detector 51 is output to the control unit 50. The control unit 50 feedback-controls the pump 42 of the acid stock solution supply device 40 based on the detection value input from the pH detector 51 and the preset control threshold value. Based on the operation signal input from the control unit 50, the pump 42 sucks out a predetermined amount of the acid stock solution Z corresponding to the operation signal from the acid stock solution tank 41 and supplies it to the tubular member 60 by the line 44. Further, the control unit 50 can control the pump 42 to automatically adjust the supply amount of the acid stock solution Z to be supplied to the acid treatment liquid 11 based on the detection value of the pH detector 51.
The acid stock solution Z sucked out from the acid stock solution tank 41 by the pump 42 that received the operation signal from the pH detector 51 is supplied to the tubular member 60, and a plurality of discharge holes 61a and 61b provided in the tubular member 60. From ..., it is discharged (dropped) into the acid treatment liquid 11. The acid stock solution Z dropped into the acid treatment liquid 11 is immediately dissolved in the acid treatment liquid 11. This solubility is such that the acid stock solution Z is water-soluble, and the acid treatment liquid 11 is subjected to circulation or the like generated in the acid treatment liquid 11 by propulsion of the ship body 10, passage of a seaweed net, rotation of a roller 72, or the like. By being in a stirred state, it dissolves and diffuses in the acid-treated liquid 11 diluted with seawater in the acid treatment, whereby the pH value that fluctuates to a high value in the acid-treated liquid 11 is set to a predetermined pH value. Can be done. The display of the pH value can also be confirmed on a waterproof pH display liquid crystal screen or the like (not shown) provided in the control unit 50.
The seaweed net N to which the acid-treated cultured seaweed adheres passes under the roller 72 and is acid-treated, and then as the ship body 10 further advances, it is located outside the ship body 10 and behind the ship. N will return to the original farmed sea surface.

The acid treatment vessel of the seaweed net of the present invention has at least an acid treatment tank for accommodating the acid treatment liquid, an acid stock solution supply device for supplying the stock solution of the acid treatment liquid into the acid treatment tank, and an acid in the acid treatment tank. It is an acid treatment ship of seaweed net equipped with a control unit that detects the pH value of the treatment liquid and operates the acid stock solution supply device based on the detection value to control the acid treatment liquid to a constant pH value. The acid stock solution supply device is provided with at least one bottomed tubular member having a plurality of discharge holes for ejecting the acid stock solution at an arbitrary position on the acid treatment tank, and the tubular member. The gist is that the inner diameter, the number of discharge holes, and the hole diameter of the discharge holes are within each specific range. Therefore, the present invention is not limited to the first to fifth embodiments. The following embodiments of each modification can be adopted as long as they are not changed.
For example, in an acid-treated seaweed net having various devices (winding rolls, sheet-shaped members, etc.) of the first to fourth embodiments, two tubular members are provided on both sides of the sheet-shaped member. , Arbitrary on the acid treatment tank at a place that does not interfere with the winding and feeding of the seaweed net, such as the winding roll of the fifth embodiment and the acid processing ship (passing ship) of the seaweed net having no sheet-like member. As long as it is placed at a position, only one (one side) may be used at any position, and the seaweed net may be wound depending on the form of the acid treatment tank to be applied, the presence or absence of a winding roll or a sheet-like member, and the like. In addition, a plurality of three or more may be provided at an arbitrary position on the acid treatment tank so as not to interfere with feeding or the like.
Further, the mounting mode may be not only a horizontal position but also a vertical or diagonal position with respect to the acid treatment tank.

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples and the like.

[Examples 1 to 21 and Comparative Examples 1 to 11]
[Test 1]
Using the test equipment of the seaweed mesh acid treatment ship with the following configuration, the inner diameter of each tubular member (tubular members 1 to 32) shown in Table 1 below, the number of discharge holes, the hole diameter of the discharge hole, and the hole diameter of the first discharge hole were determined. On the other hand, the balance of the amount of the acid stock solution ejected from each ejection hole and the difference in the response time of the pump / ejection were tested by the following test method using the one in which the ratio of the pore diameters of the last ejection holes was varied.

(Main configuration of test equipment for seaweed net acid treatment ship)
Acid stock solution Z: "Grogen" manufactured by Daiichi Seisakusho
Pump 42: Electromagnetically driven metering pump EHN, manufactured by Iwaki Co., Ltd. (Discharge rate: 1000 ± 50 ml / min)
Size of tubular member 60, etc .: Each dimension shown in Table 1 below

(Test method)
The pump 42 was started, the acid stock solution Z was sent to the tubular member 60, the pipe was filled with the acid stock solution in advance, and the pump 42 was stopped. Immediately after that, the pump 42 was started and stopped for 1 minute, the acid stock solution ejected from each discharge hole of the tubular member was collected, and the amount ejected from each discharge hole was measured (divided into two tubular members). In the case, the total of the two discharge holes). From each of these ejection amounts, the relative difference (ejection amount) between the first discharge hole and the last discharge hole, the second discharge hole and the previous discharge hole, and the first half discharge hole and the second half discharge hole. Balance) was calculated.
In addition, the time between the start of the pump and the start of ejection from all the discharge holes of the tubular member, and the time of stop of the pump and the stop of ejection from all the discharge holes of the tubular member were measured, and the difference in response time between the pump and the discharge was calculated.
The guideline for each evaluation of these ejection volume balance and pump / ejection response time difference is shown below, and the evaluation results are shown in Table 2 below.

[Evaluation guideline]
The ejection amount balance is preferably 50% or less, more preferably 35% or less, more preferably less than 20%, and particularly preferably less than 10%.
The pump / ejection response time difference is preferably less than 3 seconds, more preferably 2 seconds or less, and more preferably 1 second or less.

[Test 2]
Using the seaweed net acid treatment vessel of FIG. 1 and FIG. 2 and the seaweed net having the following configuration, the inner diameter of each tubular member (tubular members 1 to 32) shown in Table 1 below, the number of discharge holes, the hole diameter of the discharge holes, first. The difference between the set pH value and the actual pH value in the acid treatment tank was tested by the following test method using the one in which the ratio of the hole diameter of the last discharge hole to the hole diameter of the discharge hole was changed. gone.

(Main composition of nori net acid treatment ship)
Acid stock solution Z: "Grogen" manufactured by Daiichi Seisakusho
Seawater contained in acid treatment tank 15: 800L (seawater collected from the Ariake Sea, Arao City, Kumamoto Prefecture, the same applies hereinafter)
Pump 42: Electromagnetically driven metering pump EHN, manufactured by Iwaki Co., Ltd. (Discharge rate: 1000 ± 50 ml / min)
Control unit 50: A device that automatically adjusts the supply amount of the acid stock solution Z to be supplied based on the detection value of the pH detector 51.
pH detector 51: PET-M3, size of tubular member 60 manufactured by Sem Corporation: pH meter for measuring each dimension shown in Table 1 below: Handy pH meter "TPX-999", manufactured by Toko Kagaku Kenkyusho Co., Ltd.

(Test method)
The pH of the treatment liquid in the acid treatment tank 15 of the acid treatment ship of the seaweed net was adjusted in advance to 2.00 using Grogen (treatment liquid temperature: 18 ° C.). The set pH of the control unit 50 was set to 2.00. While stirring by rotating the take-up roll of the acid treatment vessel, the acid treatment tank 15 is continuously supplied with 30 L of seawater (for dilution) per minute, and the same amount of treatment liquid is continuously supplied to the outside of the treatment tank. It was drained. In a situation where the treatment liquid in the acid treatment tank 15 was continuously diluted (simulating the acid treatment of a seaweed farm), the control unit 50 was operated for 10 minutes and displayed on the monitor of the pH detector 51. The pH was measured, and the difference (deviation) in pH from the set pH and the fluctuation range of control (value obtained by subtracting the minimum value from the maximum value) were calculated.
In addition, five handy pH meters for measurement are arranged at five points so as to cover the inside of the acid treatment tank 15 (from the side closest to the first discharge hole, <1>, <2>, <3>, <4>, <5> was arranged in this order (see FIG. 8), and the pH variation in the acid treatment tank 15 (the value obtained by subtracting the minimum value from the maximum value in the average of each point) was calculated. When the number of tubular members was one, it was attached to the upper side of the support member 25 on FIG.
The guideline for each evaluation of pH deviation, control fluctuation width, and pH variation, which are the evaluations of these tests 2, and the comprehensive judgment are shown below, and the evaluation results are shown in Table 2 below.

[Evaluation guideline]
The pH deviation is preferably 0.03 or less, and particularly preferably 0.02 or less (both are absolute values).
The control runout width is preferably 0.06 or less, more preferably 0.05 or less, and particularly preferably 0.04 or less.
The pH variation is preferably 0.1 or less, more preferably 0.06 or less, and directly preferably 0.04 or less.

〔Comprehensive judgment〕
⊚: Relative difference (balance) of ejection amount 15% or less, pump / ejection response time difference within 1 second, pH deviation 0.02 or less, control swing width 0.05 or less, pH variation 0.04 or less ○: Relative ejection amount Difference (balance) 20% or less, pump / ejection response time difference within 2 seconds, pH deviation 0.02 or less, control swing width 0.06 or less, pH variation 0.06 or less △ ～ ○: Relative difference (balance) in ejection amount 50% or less, pump / ejection response time difference within 2 seconds, pH deviation 0.03 or less, control swing width 0.06 or less, pH variation 0.10 or less Δ: Relative difference (balance) of ejection amount 60% or less, pump / Ejection response time difference within 2 seconds, pH deviation, 0.05 or less, control fluctuation width 0.10 or less, pH variation 0.15 or less ×: In each evaluation guideline of △ above, at least two or more are based on △ criteria. Things that do not meet.

As is clear from the results of Tables 1 and 2 (Tests 1 and 2), Examples 1 to 21 of the present invention have each discharge hole of the tubular member as compared with Comparative Examples 1 to 11 which are outside the scope of the present invention. It was confirmed that the relative difference in the ejection amount was small, the ejection amount balance of the tubular member was good, the time difference between the pump start / stop and the ejection start / stop was extremely small, and the pump / ejection response was good. confirmed. Further, from Test 2, the tubular member within the scope of the present invention is made so that the deviation between the set pH value and the actual pH value in the acid treatment tank is minimized and the concentration unevenness in the acid treatment tank does not occur. It was confirmed that an acid treatment vessel with a seaweed net that can efficiently perform sufficient acid treatment can be obtained by using. From these results, it is clear for the first time that a tubular member having an inner diameter of 3 to 7 mm, a number of discharge holes of 3 to 10, and a hole diameter of 1.0 to 2.0 m is excellent. It became. Further, in addition to the above conditions, a tubular member (Examples 2, 4, 5, 7, 10) in which the ratio of the hole diameter of the last discharge hole to the hole diameter of the first discharge hole is 1.08 to 1.27 times. It became clear that 11 and 17) were particularly excellent.

It can be suitably used for an acid treatment vessel for seaweed nets, which can efficiently perform acid treatment with an acid treatment agent (liquid) for fungi such as diatoms and red rot bacteria that adhere to the seaweed net during cultivation.

A Nori net acid treatment ship 10 Ship body 11 Acid treatment liquid 15 Acid treatment tank 20 Winding roll 25 Support member 30 Sheet-like member 40 Acid stock solution supply device 50 Control unit 60 Tubular member 61a to 61e Discharge hole 62 Has visibility Flexible tube

Claims (5)

At least, the pH value of the acid treatment tank containing the acid treatment liquid, the acid stock solution supply device for supplying the stock solution of the acid treatment liquid into the acid treatment tank, and the acid treatment liquid in the acid treatment tank is detected, and the pH value thereof is detected. A seaweed net acid treatment vessel equipped with a control unit that operates the acid stock solution supply device based on the detected value to control the acid treatment liquid to a constant pH value, and the acid stock solution supply device includes the acid stock solution supply device. At least one bottomed tubular member having a plurality of discharge holes for ejecting the acid stock solution is provided at an arbitrary position on the acid treatment tank, and the tubular member has an inner diameter of 3 to 8 mm and is discharged. The number of holes is 3 to 10, the hole diameter of the discharge hole is 1.0 to 2.0 mm, and the ratio of the hole diameter of the last discharge hole to the hole diameter of the first discharge hole of the tubular member is An acid treatment ship for seaweed nets, which is characterized by being 1.08 to 1.27 times larger . When the number of discharge holes (a) of the tubular member is four or more, the distance (X1) between the first discharge hole and the second discharge hole, and the discharge hole immediately before and last of the last discharge hole. The intervals between the discharge holes are the same (X1 = Xa-1, a is the number of discharge holes), and the discharge holes (Xa-1) immediately before the last discharge hole from the second discharge hole (X2) The acid-treated seaweed net according to claim 1, wherein the intervals are the same (X2 = X3 = ...). The acid treatment vessel for seaweed nets according to claim 1 or 2 , wherein the acid treatment vessel for seaweed nets is provided with a take-up roll for winding the seaweed nets in the acid treatment tank. The acid treatment ship of the seaweed net has a support member suspended from the central portion of the acid treatment tank and a sheet-like member hanging from the support member to the acid treatment liquid of the acid treatment tank. The acid-treated seaweed net according to any one of claims 1 to 3 , wherein the tubular member is provided on one side or both sides of the shaped member. A flexible tube is attached to each discharge hole of the tubular member, and the flexible tube is characterized in that the acid stock solution dropped in the tube can be visually recognized . The acid treatment ship for seaweed net according to any one of claims 1 to 4 .

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