JPH10180233A - Jellyfish treatment and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the disposal of jellyfish in a short time by crushing jellyfish before subjecting solid matter such as shellfish during storage in a storage hopper to sedimentation and heating the crushed jellyfish while caused to circulare and flow on a circulating line, to oxidize BOD and COD components in jellyfish water by an electrolytic means. SOLUTION: Jellyfish captured by a rotary dust collector are thrown in a receiving hopper 5, and then, they are conveyed to a crusher 12 through a bucket conveyor 10 and are crushed by an impeller there. The crushed jellyfish are stored in a storage hopper 14 and solid matter such as shellfish is subjected to sedimentation during the storage. From the sidewall of the storage hopper 14, slender pieces of the jellyfish or the like are sent to a swelling reaction tank 44 by a conveying pump 18 and pressure thereof is boosted in a process wherein the crushed jellyfish are heated and caused to flow. Since as a result, the heated and crushed jellyfish undergoes cell destruction, they are discharged to a flash tank 56 through a discharge pipe 52 thereafter, and jellyfish water in a high flowability state is formed by elution of the moisture and making the jellyfish fine.

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 is heated and circulated on a circulation line connected to a reaction tank for heating and pressurizing, and after mixing the jelly water obtained after depressurization, the BOD and COD components contained in the jelly water are mixed. Was oxidized by electrolytic means. Further, in the second invention, a crushing device for crushing the landed jellyfish into small pieces by crushing means, a reaction tank for heating the crushed jelly under pressure, and an inlet connected to the downstream side of the heating reaction tank A flash tank provided with a flash valve, and a jelly water circulation line provided with a circulation pump and a heater provided between the heating reaction tank and the jelly water circulation line downstream of the flash tank are oxidized. An electrolytic cell was provided. Further, in the third invention mainly based on the second invention, a circulation line for circulating and returning a part of the jelly water from the vicinity of the inlet of the electrolytic cell to the flash tank is provided.

[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 a preheater 42, an expansion reaction tank 44, a stirrer 45, a circulation line 46, and a circulation pump 4.
8, a heater 50, a flash valve 54, a flash tank 56, a jelly water supply pump 58, a heat exchanger 60, a strainer 62, a combustor 64, and a suction fan 66.

A preheater 42 is interposed in the feed line 40 from the storage hopper 14 and heats the crushed jelly to be conveyed before it is introduced into the expansion reaction tank 44 for heating in a heated state. Heat load is reduced. The expansion reaction tank 44 heats and pressurizes the introduced preheating crush jelly, which is configured as a closed container. A circulation line 46 is connected to the expansion reaction tank 44 in parallel. The jelly water is circulated and recirculated from the lower outlet of the expansion reaction tank 44 toward the upper part of the tank. The pH value of the jellyfish is about 7 to 7.5.

A circulation pump 48 is provided in the circulation line 46 for circulation, and the preheating crush jelly supplied from the preheater 42 is introduced into an inlet of the circulation pump 48.
The preheating crush jelly is forcedly circulated through a circulation flow path composed of an expansion reaction tank 44 and a circulation line 46. Also,
A heater 50 is provided in the circulation line 46 so that the preheating crush jelly is heated to about 130 ° C. in the course of circulation.

The expansion reaction tank 44 and the circulation line 46
The swelling reaction tank 44 is equipped with a pressure regulating valve (not shown) so that the pressure of the crushed jelly is increased in the course of heating and flowing in the circulating flow path composed of, and the pressure is maintained at approximately 5 kg / cm2. In this embodiment, the preheated crushed jelly which is continuously pressure-fed flows in the circulation flow path, and the heating crushing jelly is adjusted so that the crushing jelly amount level of the expansion reaction tank 44 at this time is constant. Jellyfish are to be continuously discharged to the next tank.

Of course, for batch processing, the expansion reaction tank 44 and the circulation line 4
It is also possible to provide a plurality of flow path shut-off valves for shutting off the flow path on the upstream side and the downstream side of the circulation unit composed of 6, and heat and pressurize in a state where a certain amount of crush jelly is introduced into this unit. Good. The expansion reaction tank 44 has a stirrer 45.
Is attached, and by rotating the stirrer 45, the jellyfish in the reaction tank 44 is uniformly heated.

Heated and pressurized jellyfish heated and pressurized while flowing through the circulation channel causes cell destruction.
(Or the circulation pump 4 of the circulation line 46)
A discharge pipe 52 is connected to the outlet side (8), and is connected to a flash tank 56. Here, when the heated crushed jellyfish is discharged to the flash tank 56 through the discharge pipe 52, a flash valve 54 for releasing the pressure of the heated crushed jelly to the atmospheric pressure instantaneously to perform flashing is provided to the discharge pipe 52. Provided.

Therefore, the heated crushed jelly, which is pressure-fed from the pump 48 in the circulation flow path, is instantaneously released to the atmospheric pressure by passing through the flash valve 54, and is heated and crushed by the depressurization. The water existing in the jellyfish evaporates and expands rapidly, and this action promotes the destruction of the jellyfish cells. The elution of water and the miniaturization of the jellyfish produce jelly water in an extremely high fluidity state. To be housed.

For this reason, in the process of introducing preheated crushed jelly into the expansion reaction tank 44 and circulating and flowing the circulation flow path between the expansion reaction tank 44 and the circulation line 46, the crush jelly is heated. Heated by the vessel 50 and circulated in a pressurized state, the jellyfish reaches a uniform temperature state. In the circulating flow, the jellyfish is uniformly heated to about 130 ° C, part of the jellyfish cells are destroyed by thermal alteration, and at the same time, the water in the jellyfish evaporates to obtain the pressure in the vapor-liquid equilibrium state The pressure in the road reaches about 5 kg / cm2.

A part of the depressurized jelly water is separated into gas and liquid by isenthalpy expansion in the flash tank 56, but is generated when flash evaporated or decomposed in the expansion reaction tank 44 and entrained. The offensive odor is sucked and discharged by a suction fan 66 provided above the flash tank 56, and is incinerated in a combustor 64 using a combustion aid. The gas remaining in the flash tank 56 is forcibly sucked and discharged by the suction fan 66 so that the inside of the flash tank 56 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 56.
The jelly water stored in the flash tank 56 is discharged by a jelly water supply pump 58 disposed on the outlet side of the flash tank 56. The discharged jelly water is heated to about 40 ° C. by a heat exchanger 60 using seawater as a cooling medium.
Cooled down.

The jelly water cooled to about 40 ° C. in the heat exchanger 60 is removed by a switchable strainer 62 to remove solids 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.

[0023] From these facts, high concentrations of BOD and CO
The jelly water containing D is electrolyzed in the next electrolysis step, and is discharged into seawater as jelly water containing low-concentration BOD and COD at a releasable level. Here, the electrolysis step 300 includes the electrolysis tank 80.

In the expansion step 200, crushed jelly is expanded.
The jelly water was removed of solid matter by the strainer 62.
After that, it is fed to the electrolytic cell 80 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 electrolytic cell 80 passes through the circulation line 68 and is supplied to the flash tank 5.
The flash liquid that has been circulated back to 6 and has been flashed in the flash tank 56 is cooled to, for example, about 70 ° C. While the cooled jelly water passes through the electrolytic cell 80, BOD and COD are oxidatively decomposed with high efficiency. In addition, a part of the jelly water is
By returning the jelly water to the flash tank 56 through the circulating tank, the temperature of the jelly water is lowered to about 70 ° C., so that a special material is not used for the heat exchanger 60, and the cost can be reduced.

[0026]

As is clear from the above description, according to the present invention, the following is achieved. That is, in the swelling step, the swelling treatment is sufficiently performed until the particles become fine, and chlorine obtained by direct electrolysis is used for the oxidation of the treated jelly water.
lO) Compared to adding, 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 Jelly processing apparatus 5 Receiving hopper 10 Bucket conveyor 12 Crusher 14 Storage hopper 16 Solids take-out container 18 Crush jelly transport pump 42 Preheater 44 Expansion reaction tank 45 Stirrer 46 Circulation line 48 Circulation pump 50 Heater 52 Discharge pipe 54 Flash Valve 56 Flash tank 58 Jelly water feed pump 60 Heat exchanger 62 Strainer 64 Combustion furnace 66 Suction fan 68 Circulation line 80 Electrolysis tank 84 Degassing tank 100 Crushing step 200 Expansion step 300 Electrolysis step

Claims (3)

[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 the storage is sedimented and separated. After removing the crushed jelly, heating the crushed jelly while circulating and flowing on a circulation line connected to a reaction tank for pressurization, mixing the jelly water obtained after depressurization, A jellyfish treatment method, characterized in that BOD and COD components contained in jellyfish water are oxidized by electrolytic means. 2. A crusher for crushing landed jellyfish into small pieces by means of crushing means, a reaction tank for heating the crushed jelly under pressure, and a flash connected to a downstream side of the heating reaction tank and provided at an inlet. A flash tank with a valve,
A jelly water circulation line provided with a circulation pump and a heater provided between the heating reaction tank and the heater is provided, and an electrolysis tank for oxidizing the jelly water is provided downstream of the flash tank. Jellyfish processing equipment. 3. A jellyfish treatment device, comprising: a circulation line for circulating and returning a portion of jellywater from a vicinity of an inlet of the electrolytic cell according to claim 2 to a flash tank.