JPH10174962A - Jelly fish treatment method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently treat a jelly fish within a short time. SOLUTION: A landed jelly fish is finely crushed by a crushing means 100 to be once stored in a storage hopper 14 and solid matter such as a shellfish or the like accompanied by the jelly fish during storage is sedimented and separated to be removed to obtain the crushed jelly fish. This jelly fish is heated under pressure and subsequently depressurized immediately thereafter to be subjected to swelling treatment 200 to obtain jelly fish water and the BOD and COD components contained in the obtained jelly fish water are oxidized by an electrolytic means 300.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jellyfish decomposition treatment method, and more particularly to jellyfish collected by a rotary dust remover provided at an intake of a power plant or the like for the purpose of preventing foreign matter from entering a cooling water system. The present invention relates to a jellyfish treatment method and apparatus for electrolytically treating jelly water obtained by performing a pre-treatment such as dehydration and pulverization and then performing a puffing treatment.

[0002]

2. Description of the Related Art In the latter half of the rainy season, a large amount of jellyfish grow around the waters near Japan. At power plants and factories constructed along the coast, large amounts of seawater are used as cooling water, but the generated jellyfish rushes along with the tide, mixes with the cooling water, and enters the cooling machine from the intake. If it is taken in, it causes many harmful effects such as a decrease in thermal efficiency, a decrease in the performance of the pump, and clogging of a filter. For example, a power plant uses a rotary dust remover to collect jellyfish that has been pushed into an intake port.

[0003]

However, when processing collected jellyfish, there are the following problems. The collected jellyfish is 7 to 8 t / h. The collected jellyfish is temporarily stored in a basin, transported to a landfill pond by truck at any time, and disposed of. They had to drop power generation capacity. In addition, the large amount of jellyfish that have been landed in the summertime produces a bad smell like fish rot due to the large amount in the summer, causing odor pollution, and also prevents sewage from flowing out from the speculative place, thus preventing such adverse effects. Jellyfish itself cannot be incinerated because it has a water content of 95 to 98% even if it is to be incinerated in order to do so. To reclaim land, the jellyfish must be transported from the landing site to the landfill site, and a large number of trucks must be used for that purpose. extremely difficult.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide a jellyfish processing method and processing apparatus which can efficiently and judge jellyfish in a short time.

[0005]

In order to achieve the above object, according to a first aspect of the present invention, landed jellyfish is crushed into small pieces by crushing means and then temporarily stored in a storage hopper. After sedimentation and separation of solids such as shellfish carried to jellyfish during storage to remove the solids and obtain crushed jellyfish,
The crushed jelly was heated under pressure, then the heated crushed jelly was instantaneously depressurized to obtain jelly water, and then the BOD and COD components contained in the jelly water were oxidized by electrolytic means. Further, in the second invention, a crushing device for crushing the landed jellyfish into small pieces by crushing means, a swelling device for heating the crushed jelly under pressure and instantaneously depressurizing it to produce jelly water, It consists of an electrolyzer that oxidizes jelly water.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a jellyfish processing method and apparatus according to the present invention will be described below with reference to FIG.

FIG. 1 is a flowchart of a jellyfish processing process. The jellyfish processing apparatus 1 of the present invention comprises a crushing step 10
0, an expansion step 200 and an electrolysis step 300.

First, the crushing step 100 will be described. The crushing device 100 includes a receiving hopper 5, a bucket conveyor 1
0, a crushing device 12, a storage hopper 14, a solids take-out container 16, and a crushing jelly transfer pump 18. For example, jellyfish caught in a large amount by a rotary dust remover (not shown) such as a travel screen installed at a seawater intake port is conveyed to the jellyfish processing device 1 arranged adjacently. In this case, it is desirable that the dust is not directly brought into the crushing step 100 via a transportation means such as a truck, but is brought directly into the crushing step 100 from a rotary dust remover.

The jellyfish caught in a large amount by a rotary dust remover (not shown) is fed into a receiving hopper 5. In addition, between the rotary dust remover and the receiving hopper 5, for example, a trommel or a vibrating sieve having a mesh portion of an appropriate opening, which is not shown, is provided. Jellyfish and the like fall from the net portion, and solids such as wood pieces pass through the net portion and are discharged out of the system without falling.

[0010] The solids such as jellyfish and shells which have fallen on the net portion such as the trommel or vibrating sieve are conveyed to a crushing device 12 via a bucket conveyor 10. In the crushing device 12, the crushed jelly is crushed by an impeller rotating at a high speed, and is formed into a sliced crushed jelly comprising solid matter and moisture of the jelly. The jellyfish crushing means is not particularly limited as long as the jellyfish can be roughly crushed, but in this case, for example, when crushed by a mixer or a crusher or the like, it is liquefied or flaked. However, since solids such as shellfish accompanying the jellyfish are also crushed into small pieces together, the drawbacks such that the jellyfish and the solid matter such as the shellfish are difficult to settle and separate effectively in the storage hopper 14 described below. It is desirable not to have.

The jellyfish coarsely crushed by the crushing device 12 continuously falls and is stored in a storage hopper 14 disposed below the crushing device 12. During storage in the storage hopper 14, the crushed jelly settles and separates due to the specific gravity difference between the coarsely crushed jelly and the solid matter such as shellfish, and the solid matter having a large specific gravity is intermittently provided at the bottom of the storage hopper 14. It is intermittently withdrawn from a valve (not shown) into a solids take-out container 16 provided below the storage hopper 14. In this example, as described above, the crushing means was coarsely crushed by the impeller rotating at a high speed as described above to obtain a sliced crushed jellyfish composed of jelly solids and water. It may be strips.

On the other hand, from the side wall of the storage hopper 14, small pieces of jellyfish having a low specific gravity floating without being settled during storage in the storage hopper 14 are crushed jelly transport pump 1.
8 is a puffing reaction tank 20 which forms a part of a puffing step 200
Sent to The expansion process 200 includes an expansion reaction tank 20, a stirrer 22, a flash valve 24, a flash tank 26,
Jellyfish water supply pump 28, heat exchanger 30, strainer 3
2. It is composed of a combustor 34 and a suction fan 36.

The expansion reaction tank 20 is heated and pressurized while stirring the crushed jelly crushed in advance in the crushing step 100 with saturated steam of, for example, 5 kg / cm 2 supplied from the lower part of the expansion reaction tank 20. It has become.

The expansion reaction tank 20 is provided with a stirrer 22 having an impeller that rotates at a low speed. The impeller is rotated so that the jellyfish staying in the tank forms a uniform dispersion layer. Crushing of the heated jellyfish is also progressing in the tank. Furthermore, the expansion reaction tank 2
The saturated steam blown into the chamber 0 causes the crushed jelly to circulate and flow from the lower part of the expansion reaction tank 20 toward the upper part of the tank to uniformly heat the jelly so as not to generate a temperature distribution in the tank 20. I have.

As described above, the jellyfish in the expansion reaction tank 20 is directly heated by blowing saturated steam of 5 kg / cm2, and the crushing jelly is caused by the rotation of the impeller and the blowing of steam upward from below in the tank. Forced circulation, about 1
The temperature is raised to 30 ° C. The crushed jelly, which is uniformly heated and pressurized through a certain residence time under an operating condition in which the liquid pressure becomes a saturated vapor pressure at about 130 ° C., is discharged from the lower part of the expansion reaction tank 20 to the flash tank 26. Tube 23
By opening the flash valve 24 as needed, the pressure in the flash tank 26 is instantaneously released to the atmospheric pressure and isenthalpy expanded.

For this reason, the heated crush jelly which is pressure-fed from the expansion reaction tank 20 is instantaneously released to the atmospheric pressure by passing through the flash valve 24, and this depressurization causes the crush jelly to be broken. The existing water rapidly evaporates and expands, and this action promotes the destruction of the cell membrane of the jellyfish particles. The elution of water and the miniaturization of the jellyfish cell membrane produce jelly water in an extremely high fluidity state. Will be accommodated. The pH value of the jelly water is about 7 to 7.5.

A part of the jelly water is separated into gas and liquid by isenthalpy expansion in the flash tank 26, but the odor generated when flash evaporation or decomposed in the expansion reaction tank 20 is accompanied by the odor. The air is sucked and discharged by a suction fan 36 provided above the fuel cell 26, and is incinerated in a combustor 34 using a combustion aid. The gas remaining in the flash tank 26 is forcibly sucked and discharged by the suction fan 36 so that the inside of the flash tank 26 does not become a vacuum state. (Not shown) is provided so that the temperature of jelly water after isenthalpy expansion does not exceed 100 ° C. at the maximum.

On the other hand, the portion of jelly water not flash-evaporated is stored in the bottom of the flash tank 26.
The jelly water stored in the flash tank 26 is discharged by a jelly water feed pump 28 disposed on the outlet side of the flash tank 26. The discharged jelly water is heated to about 40 ° C. by a heat exchanger 30 using seawater as a cooling medium.
Cooled down.

The jelly water cooled to about 40 ° C. in the heat exchanger 30 is removed by a switchable strainer 32 to remove solid matter such as shellfish accompanying the jelly water. BO whose main ingredient is seawater and contains protein and other sources in it
D (biological oxygen demand) or COD (chemical oxygen demand)
At a high concentration, for example, a BOD (biological oxygen demand) of about 17
00 ppm, COD (chemical oxygen demand) about 800 pp
Since m and Cl ^- ppm are contained, it is impossible to discharge in this state.

[0020] From these facts, high concentrations of BOD and CO
The jelly water containing D is subjected to electrolytic treatment in the next electrolysis step, and is discharged into seawater as jelly water containing low concentrations of BOD and COD to a level that can be discharged. Here, the electrolysis step 300 includes the electrolysis tank 40.

In the puffing step 200, the crushed jelly is puffed.
The jelly water was removed by a strainer 32 to remove solid matter.
After that, it is fed to the electrolytic cell 40 forming a part of the electrolytic process 300.
Then, direct electrolytic treatment is performed. Such direct electrolytic treatment
Is a treatment method already widely used by major power companies
On the electrode surface, C generated by electrolysis
l _TwoBOD and COD can be released to the sea
It is oxidatively decomposed to a degree.

A part of the jelly water electrolyzed in the electrolyzer 40 passes through a circulation line 45 to the flash tank 2.
The temperature of the flash liquid circulated back to 6 and flushed in the flash tank 26 is reduced to, for example, about 70 ° C. While the cooled jelly water passes through the electrolytic cell 40, the BOD and COD are efficiently oxidatively decomposed. A part of the jelly water is supplied from the vicinity of the inlet of the electrolytic cell 40 through the circulation line 45 to the flash tank 2.
6 to return the jelly water temperature to 70 ° C.
By lowering the temperature to the extent, a special material is not used for the heat exchanger 30, and the cost can be reduced.

[0023]

As is clear from the above description, according to the present invention, the following is achieved. In other words, oxidation of jelly water generated in the expansion process involves
To use the chlorine obtained by direct electrolysis, compared with the drug (NaClO) added, Cl ^- high oxidation performance without interference due can be achieved. Further, the oxidation performance is promoted by the direct oxidation of the electrode surface. Since the pH value of the puffed jelly water is about 7 to 7.5, there is no need to adjust the pH, and it is advantageous in selecting the material. The direct electrolysis treatment performed in the electrolysis step has higher suitability for intermittent operation than the biological treatment method. By using a plant in which the expansion process and the electrolysis process are combined as in the present invention, it is possible to significantly reduce the size of the plant as compared with a conventional treatment device, and to install the plant near the intake port. .

[Brief description of the drawings]

FIG. 1 is a flowchart of a jellyfish processing process according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Jellyfish processing apparatus 5 Receiving hopper 10 Bucket conveyor 12 Crushing apparatus 14 Storage hopper 16 Solids removal container 18 Crushing jelly transport pump 20 Expansion reaction tank 22 Stirrer 23 Discharge pipe 24 Flash valve 26 Flash tank 28 Jelly water feed pump 30 Heat Exchanger 32 strainer 34 combustion furnace 36 suction fan 40 electrolytic tank 45 circulation line 100 crushing process 200 expansion process 300 electrolysis process

Claims (2)

[Claims] 1. A jellyfish that has been landed is crushed into small pieces by crushing means and then temporarily stored in a storage hopper, and solid matter such as shellfish carried along with the jellyfish during storage is settled and separated. After removing the crushed jelly, the crushed jelly is heated under pressure, and then the heated crushed jelly is instantaneously depressurized and expanded to obtain jelly water. A method for treating jellyfish, wherein the COD component is oxidized by electrolytic means. 2. A crushing device for crushing landed jellyfish into small pieces by means of crushing means, a swelling device for heating crushed jellyfish under pressure and instantaneously depressurizing it to produce jellywater; An apparatus for treating jellyfish, comprising an electrolysis apparatus for oxidizing water.