JP2014073433A - Treatment method and treatment apparatus for jellyfish - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment method and a treatment apparatus for jellyfish capable of treating a large amount of jellyfish effectively.SOLUTION: Captured jellyfish are inputted into a fulvic acid treatment tank 1. Hereby, the epidermal tissue of the jellyfish is broken. Then, living body jellyfish treated by fulvic acid solution and having the broken epidermal tissue are inputted into a hot water treatment tank 2. Hereby, a gelatinous component contained in the jellyfish is dissolved together with a large amount of water, and the volume thereof is reduced to about 1/100 time or less. The jellyfish changed into a rubber-like lump is subjected to disposal or incineration treatment.

Description

  The present invention relates to a jellyfish processing method and processing apparatus capable of effectively processing a large amount of jellyfish.

  In power plants and factories built on the coast, a large amount of seawater is taken and used as cooling water to cool the steam generated by the boiler. Various creatures and various garbage are floating in the water, but the most problematic is the jellyfish.

  In particular, in the summer, jellyfish may rush to the intake and block the intake. If the intake port is blocked, the cooling water cannot be supplied, and the power generation facility cannot be cooled. In some cases, the power plant itself may be shut down. Therefore, in order to collect this large amount of jellyfish, it is common to provide a dust remover at the water intake.

  Most of the collected jellyfish is water, but when it decays, it produces a bad odor such as hydrogen sulfide. In addition, the surrounding environment is remarkably deteriorated, for example, a liquid with a high organic concentration is eluted from the jellyfish. Therefore, a large amount of jellyfish collected at the water intake are crushed and added with a deodorizing agent, and then enzymatically decomposed by adding a degrading enzyme in a treatment tank, and then recovered and discarded.

JP-A-5-3769

  However, a large amount of jellyfish grow in the sea near Japan in the latter half of the rainy season, and the amount of jellyfish recovered is several tens of t / day. Therefore, it is necessary to secure a reservoir, a truck to transport it, a landfill, and environmental hygiene. It required a lot of labor and equipment such as maintenance.

  One of the jellyfish dehydration methods that can dehydrate and reduce the volume of jellyfish in a short time and can be disposed of efficiently is disclosed in Patent Document 1. In this method, a living jellyfish is cut into slices, and then the jellyfish pieces are dipped in clean warm water for a predetermined time to dehydrated muscle, and the dehydrated jellyfish residue is separated from the clean warm water.

  When this inventor tried to practice this method, it was difficult to reduce the volume sufficiently unless the jellyfish were crushed fairly finely. In addition, if it is finely crushed, there is a problem that it takes time to separate the jellyfish residue from the clean water. Furthermore, volume reduction as expected was not realized, and dissatisfaction remained in the volume reduction rate obtained.

  Accordingly, an object of the present invention is to provide a jellyfish processing method that can easily and greatly reduce the volume of a large amount of jellyfish.

  Another object of the present invention is to provide a jellyfish processing apparatus that can easily and greatly reduce the volume of a large amount of jellyfish.

  In order to solve the above problems, the jellyfish treatment method of the present invention comprises a step of treating a biological jellyfish with an acidic treatment solution and a step of treating the biological jellyfish treated with the acidic treatment solution with hot water. With such a configuration, the jellyfish can be greatly reduced in volume, and even if there is a large number of attacks, it can be processed without impairing the function of the facility.

  In one embodiment, it is performed near the intake of a seawater utilization plant. With such a configuration, the seawater utilization plant can be stably operated.

  Preferably, the acidic treatment liquid is a natural organic acid solution. With such a configuration, it is possible to perform waste liquid treatment that occurs during jellyfish treatment at a low cost.

  Further preferably, the organic acid solution is a fulvic acid solution. With such a configuration, there is a possibility of effective use of waste liquid generated during jellyfish processing.

  Further, preferably, the hot water is generated using exhaust heat from the seawater utilization plant. With such a configuration, jellyfish processing can be performed at low cost.

  In addition, the jellyfish treatment apparatus of the present invention contains a jellyfish trapping net that captures biological jellyfish floating in seawater, a treatment tank that contains an acidic treatment liquid for treating biological jellyfish, and hot water that treats the biological jellyfish. A treatment tank. With this configuration, the jellyfish processing method can be specifically executed.

  In the jellyfish processing method according to the present invention, harmful jellyfish can be easily processed in large quantities in a seawater utilization plant or a fishery facility. In addition, the jellyfish processing apparatus according to the present invention can be manufactured at low cost and installed in a relatively small area.

It is a figure which shows the processing apparatus of the jellyfish by Example 1. FIG. It is a figure which shows the processing apparatus of the jellyfish by Example 2. FIG.

  Hereinafter, a jellyfish processing method and a jellyfish processing apparatus according to embodiments of the present invention will be described with reference to the accompanying drawings. First, a verification experiment conducted by the inventor will be described.

<Verification experiment 1>
A moon jellyfish with a diameter of about 17 cm was poured into 4 liters of hot water at a temperature of 90 degrees filled in a water tank, and the subsequent changes were observed. As a result, there was almost no observable reduction. As a result, it was found that hot water alone cannot be expected to produce a significant effect.

<Verification experiment 2>
After the verification experiment 1, 0.5 liters of a fulvic acid solution of pH 2 was added before the hot water fell below 70 degrees. Then, it gradually reduced, and after about 20 minutes, it started to break apart and dissolve. This fragmentation and dissolution process was almost complete after 40 minutes of addition of the fulvic acid solution.

  At that stage, the jellyfish did not form, and a large number of irregularly shaped pieces floated. It was impossible to judge how much the volume actually decreased.

<Verification experiment 3>
A moon jellyfish with a diameter of about 20 cm was put into 4 liters of a fulvic acid solution of pH 2 filled in a water tank, and the subsequent changes were observed. The moon jellyfish gradually reduced in the fulvic acid solution, and the diameter was 14 cm as measured after 8 minutes.

  After that, the reduction width was small and did not become smaller than 13 cm in diameter. Moreover, turbidity was generated in the fulvic acid solution simultaneously with the reduction of the moon jellyfish. After 34 minutes, the jellyfish umbrella cracked. As a result, the volume was reduced by about 1/3.

<Verification experiment 4>
After the moon jellyfish was reduced to a diameter of 13 cm in the verification experiment 3, 4 liters of hot water was added to the fulvic acid solution. Then, it began to shrink further, and the diameter was 6 cm as measured 20 minutes after adding hot water. After that, it was reduced, and it was reduced to 4 cm in diameter 40 minutes after adding hot water. Finally, a rubbery structure remained as a lump.

  Therefore, the volume is reduced to 1% or less, and the method of the verification experiment 4 is quite effective. As an action, it is considered that the jellyfish epidermal tissue was destroyed by the fulvic acid solution, and then the gelatinous component contained in the jellyfish was dissolved with a large amount of water by hot water.

<Verification experiment 5>
Moon jellyfish with a diameter of about 20 cm was put into 4 liters of a fulvic acid solution of pH 2 filled in a water bath. Here, the fulvic acid solution was heated to 80 degrees in advance. In this case as well, in 40 minutes, the diameter was reduced to 5 cm, and a rubbery structure remained as one lump. This result can be judged to be almost equivalent to the verification experiment 4.

  FIG. 1 shows the overall configuration of a jellyfish processing apparatus according to an embodiment of the present invention. This jellyfish processing apparatus is provided in the vicinity of a cooling water intake of a seawater utilization plant such as a power plant or a factory constructed on the coast, where the jellyfish push.

  Here, the jellyfish treatment apparatus includes a fulvic acid treatment tank 1, a nylon net cage 3 having a size just fit in the fulvic acid treatment tank 1, a hot water treatment tank 2 that is substantially the same type as the fulvic acid treatment tank 1, a cooling device It consists of a moving device (not shown) that moves the net basket 3 from the vicinity of the water intake to the fulvic acid treatment tank 1 and from the fulvic acid treatment tank 1 to the hot water treatment tank 2.

  The fulvic acid treatment tank 1 has a volume of 2000 liters and is filled with a fulvic acid solution as an acidic solution. The pH of the fulvic acid solution is set to 4 or less, preferably 3 or less.

  On the other hand, the hot water treatment tank 2 has a volume of 2000 liters and is filled with hot water. The temperature of the hot water is set to 50 ° C. or more, preferably 70 ° to 90 °, and here about 80 °. For heating the hot water in the hot water treatment tank 2, the exhaust heat from the seawater utilization plant is used.

  Further, since the jellyfish finally becomes about 5 cm to 3 cm, the mesh size of the net basket 3 is set to 1 cm to 2 cm diagonally. As a jellyfish trapping net, an acid-resistant wire mesh container may be used instead of the net cage 3.

  First, the net basket 3 is installed in the vicinity of the water intake to collect jellyfish. When the net cage 3 is filled with jellyfish, it is lifted by a moving device, immersed in the fulvic acid in the fulvic acid treatment tank 1, and left as it is for about 20 minutes. This treatment destroys the jellyfish epidermal tissue. The time left here is appropriately adjusted between 10 minutes and 30 minutes depending on the situation.

  Thereafter, the jellyfish treated with fulvic acid is lifted together with the net cage 3 by a moving device, and the fulvic acid solution adhering to the jellyfish is screened out in the fulvic acid treatment tank 1. And it moves to the hot water treatment tank 2, and the net basket 3 is immersed in the hot water inside. Leave for about 40 minutes as it is, that is, with the jellyfish being roasted. The time left here is appropriately adjusted between 20 minutes and 120 minutes depending on the situation.

  Then, the gelatinous component contained in the jellyfish begins to dissolve together with a large amount of water, and the volume is reduced to about 1/100 or less. Thereafter, the net basket 3 is lifted again by the moving device, and the hot water adhering to the jellyfish is screened out into the hot water treatment tank 2. Then, the reduced jellyfish inside is taken out and incinerated.

  The above process is repeated, but when the pH of the fulvic acid solution in the fulvic acid treatment tank 1 is greater than 3, the fulvic acid stock solution is replenished to pH 2. Further, when the concentration of gelatin or body fluid eluted from the jellyfish contained in the hot water in the hot water treatment tank 2 increases and the reduction rate of the jellyfish decreases, the jellyfish is replaced with new hot water.

  The same treatment can be performed by using dilute hydrochloric acid having a pH of 2 instead of fulvic acid as the acidic solution. However, in the case of hydrochloric acid, the acid itself is inexpensive and easy to obtain, but since the waste liquid treatment is expensive, it is necessary to use it in consideration of the design of the entire system including post-treatment. Although other organic acids such as acetic acid and citric acid can be used, it is necessary to use them in consideration of problems such as odor and waste liquid treatment. Furthermore, when comparing the treatment efficiency of fulvic acid with other acids, fulvic acid was the highest.

  Note that fulvic acid is used in various applications in order to provide an environment in which anaerobic bacteria are reduced and aerobic bacteria are grown. Aerobic bacteria have a function of decomposing not only harmful bacteria but also unnecessary components such as fats and oils and other odor components. Therefore, when this fulvic acid is used as an acidic solution, the waste liquid of the fulvic acid treatment tank 1 can be reused in agriculture, for example, as a physiologically active substance.

  Furthermore, the jellyfish contains nitrogen and phosphorus that are effective as fertilizers, and the waste liquid in the hot water treatment tank 2 including some fulvic acid that adheres to the jellyfish and moves from the fulvic acid treatment tank 1 is balanced. Available as a good concentrated liquid fertilizer.

  FIG. 2 shows a jellyfish processing apparatus according to another embodiment of the present invention. The processing tank provided in the jellyfish processing apparatus here is only the heated fulvic acid processing tank 5. And like Example 1, the moving apparatus (not shown) which moves the net basket 3 from the vicinity of a cooling water intake to the heating fulvic acid processing tank 5 is provided.

  The heated fulvic acid treatment tank 5 is filled with a fulvic acid solution of pH 2 as an acidic solution, but this fulvic acid solution is always heated to 80 degrees. This heating also uses the waste heat from the seawater plant.

  In the jellyfish processing method according to this embodiment, first, the net cage 3 is installed in the vicinity of the water intake port in order to collect the jellyfish. When the net cage 3 is filled with jellyfish, it is lifted by a moving device, immersed in the heated fulvic acid in the heated fulvic acid treatment tank 5, and left as it is for about 40 minutes.

  This treatment destroys the epidermis tissue of the jellyfish and dissolves gelatinous components contained in the jellyfish with a large amount of moisture. Thereafter, the net basket 3 is lifted again by the moving device, the reduced jellyfish inside is taken out, and processing such as incineration is performed.

  When the pH of the fulvic acid solution in the heated fulvic acid treatment tank 5 exceeds 3, the fulvic acid stock solution is replenished to pH 2. Further, when the concentration of the jellyfish body fluid contained in the fulvic acid treatment liquid in the heated fulvic acid treatment tank 5 becomes high and the reduction rate of the jellyfish decreases, the entire treatment liquid is replaced.

  Also in Example 2, fulvic acid itself is a physiologically active substance, and since jellyfish contain nitrogen and phosphorus that are effective as fertilizers, the waste liquid of the heated fulvic acid treatment tank 5 can be used as a concentrated liquid fertilizer. However, since the fulvic acid solution needs to be replaced when the concentration of the jellyfish body fluid increases, the amount of the fulvic acid solution used is larger than that of the jellyfish treatment method of Example 1. On the other hand, since only one processing tank is required, the installation cost of the apparatus can be kept low. Furthermore, since the destruction of the epidermal tissue and the elution of the gelatinous material are continuously performed, the processing time of the jellyfish can be shortened.

  Since the jellyfish processing method and processing apparatus according to the present invention can easily process a large amount of jellyfish, it is possible to minimize jellyfish damage in a seawater utilization plant or a fishery facility.

  In the above embodiment, the process parameters can be appropriately set according to the actual situation. For example, in Example 1, when the jellyfish epidermal tissue is hard, it is also effective to further extend the treatment with the fulvic acid solution.

1 Fulvic acid treatment tank 2 Hydrothermal treatment tank 3 Nylon mesh basket 5 Heated fulvic acid treatment tank

Claims (10)

Treating biological jellyfish with an acidic treatment solution;
Treating the biological jellyfish treated with the acidic treatment liquid with hot water;
Jellyfish processing method consisting of   The jellyfish treatment method according to claim 1, wherein the jellyfish treatment method is performed in the vicinity of a water intake of a seawater utilization plant.   The method for treating jellyfish according to claim 2, wherein the acidic treatment liquid is a naturally derived organic acid solution.   The jellyfish treatment method according to claim 3, wherein the organic acid solution is a fulvic acid solution.   The said hot water is produced | generated using the waste heat from the said seawater utilization plant, The processing method of the jellyfish of Claim 4 characterized by the above-mentioned. A jellyfish capture net that captures living jellyfish floating in seawater,
A treatment tank containing an acidic treatment liquid for treating biological jellyfish,
A treatment tank containing hot water for treating the biological jellyfish,
Jellyfish processing equipment consisting of   The said jellyfish capture net | network is provided in the water inlet vicinity of the seawater utilization plant, The jellyfish processing apparatus of Claim 6 characterized by the above-mentioned.   The jellyfish processing apparatus according to claim 7, wherein the acidic processing solution is a natural organic acid solution.   The jellyfish treatment apparatus according to claim 8, wherein the organic acid solution is a fulvic acid solution.   The said hot water is produced | generated using the waste heat from the said seawater utilization plant, The processing apparatus of the jellyfish of Claim 9 characterized by the above-mentioned.

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