JP2008220275A - Raw laver storing method, and raw laver storing apparatus for performing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alive laver storing method, and an alive laver storing apparatus for performing the method, each enabling bringing collected alive laver to a condition of quality equal to or more excellent than when collected, i.e., enabling supply of the laver in an activated condition to a next processing step. <P>SOLUTION: This raw laver storing method comprises, when charging alive laver and seaweed into a container holding seawater or freshwater and stirring the product to store, blowing oxygen from the bottom of the container to bring an initial oxygen concentration in storage water in the container to ≥15 mg/L, and charging seaweed thereinto followed by stirring and washing. The raw laver storing apparatus is composed of a container which holds storage water and into which alive laver and seaweed are charged, a stirrer which rotates and stirs laver and seaweed in the container, and an oxygen blowing apparatus which comprises connecting an oxygen supply pipe to a diffusing nozzle connected to an oxygen supply pipe and arranged on the bottom of the container, and blowing oxygen into the container. A cover nozzle is arranged around the diffusing nozzle. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a method for storing live seaweeds and a storage device for performing the method.

Live seaweeds cultivated in the sea or directly harvested are generally stored and stored in sea water before being processed into products. In addition, before the subsequent processing, it is transferred to fresh water called “sukimizu” and stored to remove salt or the like.
For example, 15 tons of stored water such as seawater or fresh water is stored in a 3m diameter and 5m high container with an inverted conical bottom, and 4 to 5 tons of laver is placed in the storage. Rotate the impeller of the stirrer in the container to stir the laver, but the stored water gradually becomes dirty, so this stirring work can be done while continuously draining the stored water, or 2. Batch storage Water is discharged several times, or 3. Several containers are prepared and the laver is sequentially replaced.
The problem here is that live nori always undergoes oxygen respiration and carbon dioxide assimilation, but during this storage process, the oxygen concentration in the stored water rapidly decreases and deteriorates due to dirt, which significantly adversely affects oxygen respiration and carbon dioxide assimilation. As a result, the quality of the seaweed deteriorates significantly, and in some cases, it is accompanied by partial whitening symptoms and a large amount of slime elution and sedimentation. 3. Sequential replacement of seaweed into multiple containers is extremely cumbersome and time consuming and expensive.
JP 2003-228322 A JP 2004-209263 A

The present invention makes it possible to supply the collected live nori to the next processing step in the activated state, that is, in a state equivalent to or better than that of the collected live nori. Storage processing method and storage device for performing the same.

The technical means of the present invention for solving the above problems are as described in the following (1) and (2).
(1) When storing live seaweed, seaweed, etc. in a container containing seawater or fresh water, oxygen is continuously blown from the bottom of the container, and stable dissolution without seagrass etc. A method for storing fresh seaweed, characterized in that an oxygen blowing amount of 15 mg / L or more is maintained and stored.
(2) In a storage device in which seaweed, seaweed, etc. lived with seawater or fresh water are accommodated in a container and stirred with a stirrer, an aeration nozzle connected to the oxygen concentrator via an oxygen supply pipe is provided at the bottom of the container. An apparatus for storing raw laver, comprising an oxygen blowing device that is disposed and a cover nozzle having a jet hole is disposed around the aeration nozzle.

  The present invention uses the above method and apparatus to maintain a sufficient amount of oxygen respiration and carbon dioxide assimilation as a live seaweed collected at sea, equivalent to or more than when it was collected, i.e., as a nori. It can be stored in good condition without elution of the nori cell pigment, and can be supplied to the next processing step, and can produce excellent quality seaweed processed products. .

1. How to store raw seaweed
(1) Technical significance of blowing oxygen from the bottom of the container.
When oxygen is blown from the bottom of the container, all the oxygen can be dissolved in seawater efficiently and uniformly.
(2) Technical significance of maintaining an oxygen blowing amount at which a stable dissolved oxygen concentration (hereinafter simply referred to as a stable dissolved oxygen concentration) in a state where no seaweed or the like is charged is 15 mg / L or more.
Stirring while maintaining a stable oxygen supply rate of 15 mg / L or higher in the stored water in the stored water in the container, stabilizes the oxygen respiration and carbon dioxide assimilation of the loaded laver at a high level. It exhibits excellent operational effects that reliably prevent quality degradation of laver and improve quality. Furthermore, it prevents the early deterioration of stored water and suppresses the decrease in transmission of sunlight, further promoting the activation of oxygen respiration and carbon dioxide assimilation in seaweed. On the other hand, if the stable initial oxygen concentration in the stored water in the container is less than 15 mg / L, the stored water in the container may become so-called oxygen deficient, which becomes red water early during stirring. The dye is eluted and deteriorates, and in some cases there is a risk of dying, so the stored water must be replaced frequently, which is a complicated operation.
(3) A technique for making the temperature of the stored stored water preferably 10.0 to 13.0 ° C. when the live laver, seaweed, etc. are charged in the container storing the stored water and stored while stirring. Significance.
It is an optimal temperature environment for living seaweed to inhabit by oxygen respiration and carbon dioxide assimilation, and maintaining this is a necessary necessary condition.

2. Raw seaweed storage device
(1) In the present invention, a container for storing stored seawater, seaweed, etc. in the present invention is made of SUS, concrete, etc., cylinder / square tube, spherical, cone / pyramidal, truncated cone / pyramid The storage water supply means adopts other known storage water supply means such as batch replacement, continuous supply / drainage, and the like.
(2) In the present invention, the stirrer for rotating and stirring the laver, seaweed and the like in the container is, for example, a simple device in which a rotation driving device is installed outside the container and an impeller for stirring the laver in the container is connected thereto. Or a jet-jet stirrer of stored water or the like.
(3) In the present invention, an oxygen blowing apparatus that blows oxygen into the container from the diffuser nozzle disposed at the bottom of the container is, for example, improved by the inventors of the above-mentioned Patent Document 2 to absorb and release moisture. A “rotary valve type oxygen concentrator” (trade name: DO-UP-kun) with a cylinder attached, and its basic configuration in parallel with a pneumatic feed pump via a ceramic rotary valve (patent document 1: Japanese Patent No. 3597155) Connect the two air-absorbing / moisture-releasing cylinders-nitrogen-absorbing / denitrifying cylinders with a communication pipe, and rotate the rotary valve at a low speed to change the air communication route to "Rotary valve-first moisture-absorbing / humidifying cylinder-nitrogen-absorbing / releasing The first route of Nitrogen Tube-2 Nitrogen Absorption / Denitrogenation Tube-Moisture Absorption / Humidity Release Tube-Rotary Valve ” Nitrogen absorption / desorption cylinder-Moisture absorption / desorption cylinder-Rotary bar There is an apparatus method that alternately second route of the probe "repeated switching pressure equalization. As a modification of this method, a dehumidifying device comprising a cooler and a cyclone may be installed between the pneumatic feed pump and the rotary valve in place of the moisture absorbing / releasing cylinder.
With such an oxygen concentrator, air is continuously taken in and inert gases such as moisture and nitrogen are adsorbed and removed to separate and collect oxygen with a high concentration of 85% or more, and this is distributed from the oxygen supply pipe to the bottom of the container. Oxygen is continuously blown into the container from the air nozzle.
(4) At the bottom of the seaweed container, the seaweed stirred together with the stored water itself, or scraps and slime from the seaweed swirl and settle. Therefore, in the present invention, the shape of the air diffuser nozzle is a cylinder / rectangular tube shape having a large number of oxygen injection holes around it, a spherical shape, a cone / pyramidal shape, a truncated cone / pyramidal shape, etc. A cover nozzle is provided around the diffuser nozzle, and gas is filled between the diffuser nozzle and the cover nozzle so that uniform and fine oxygen gas is stably injected from the outlet hole of the cover nozzle and from above. The cover nozzle prevents intrusion of laver swarf and scum that are swirling and settling into the diffuser nozzle side, and reliably prevents nozzle clogging due to swarf laver and scum on the diffuser nozzle. The bubbles are discharged into the stored water to stably keep the dissolved oxygen (DO) in the stored water at a predetermined value or higher.

1. 1. Description of Storage Device FIG. 1 is an explanatory view showing the entire embodiment of the raw laver storage device of the present invention. FIGS. 2 (1) and 2 (2) show the oxygen concentrator shown in FIG. It is a detailed explanatory view showing two examples. 3 is a detailed enlarged explanatory view of the main part of the diffuser nozzle shown in FIG. 1. FIG. 3 is a plan explanatory view in which a part of the cover nozzle is cut away so that the diffuser nozzle can be seen. It is a cross-sectional explanatory drawing from arrow AA of (1).
The raw laver storage device includes a storage container 100, a stirrer 200, and an oxygen blowing device 300.
The storage container 100 is made of concrete and has a height of 2800 mm, a bottom 102 having a side of 3000 mm, and a bottom having an inverted quadrangular pyramid shape (storage water capacity of 25 tons). The bottom 102 is an inverted quadrangular pyramid and the other is a square cylinder. The amount of stored water is 15 tons, and the laver capacity is 5 tons.
The stirrer 200 is for rotating and stirring the laver, seaweed, etc. in the storage container 100. The stirrer 200 is fixed to the central portion of the loading port 101 and has a rotary drive motor device 201 having a built-in speed reducer, and a bowl-shaped rotary shaft 202. And a large impeller 203 for stirring and a small impeller 204 are fixedly connected to the rotating shaft 202 so as to be horizontally rotatable.
The large impeller 203 has three blades with a blade length of 90 mm and a blade width of 20 mm, and the small impeller 204 has three blades with a blade length of 50 mm and a blade width of 20 mm. The rotational speed of the rotary drive motor device 201 is 10 to 30 rpm (low speed) 10 revolutions, 30 revolutions at high speed).
The oxygen blowing apparatus 300 is fixedly disposed outside the storage container 100 and fixed to the oxygen concentrating apparatus 301 that produces oxygen having a concentration of 85% or more, preferably at the center of the bottom 102 of the storage container 100 via the oxygen supply pipe 302. It communicates with the diffuser nozzle 303. The oxygen supply pipe 302 is piped to the inner wall 103 from the inlet 101 of the storage container 100 by a socket. The diffuser nozzle 303 is a porous (porous) cylindrical nozzle made of ceramics, and covers the upper, side and front / rear sides thereof with a cover nozzle 305. The cover nozzle 305 is made of SUS and is fixedly supported on the holding plate 308, and is a semicircular cylindrical tube having a length of 300 mm and a radius of 60 mm. The oxygen ejection holes 306 were arranged with a diameter of 3 mm and a pitch of 7 mm. The holding plate 308 is fixed to the upper surface of the bottom portion 102 of the storage container 100 by holding legs 309 and has eight inner and outer water passages 304 with a diameter of 20 mm and a pitch of 68 mm.
Then, uniform and fine bubbles having a diameter of 1 to 2 mm are discharged from the aeration nozzle 303, which is ejected into the sea through the cover nozzle 305, stirred by the impeller, and immediately dissolved in the seawater. The initial dissolved oxygen amount DO in the storage water before stirring before stirring is maintained at 15 to 40 mg / L.
A specific example of the oxygen concentrating device 301 of the oxygen blowing device is shown in (1) and (2) of FIG. Specific example 1 shown in (1) of FIG. 2 includes a pneumatic feed pump 310 via a ceramic rotary valve 311 (Patent Document 1: Japanese Patent No. 3597155). 313a Nitrogen absorption and denitrification cylinders 312b and 313b are connected with communication pipes 314b and 314d, and the rotary valve 311 rotates at a low speed, and the air communication route is changed to "Rotary valve 311-communication pipe 314a-first moisture absorption and dehumidification cylinder 312a. -Communication pipe 314b-Nitrogen absorption / denitrification cylinder 312b-Orifice 317a-Communication pipe 314c-Orifice 317b-Second nitrogen absorption / denitrification cylinder 313b-Communication pipe 314d-Moisture absorption / moisture release cylinder 313a-Communication pipe 314e- The first route of the “rotary valve 311” and “rotary valve 311—communication pipe 314e—second moisture absorption / desorption cylinder 313a—communication pipe 314d—nitrogen absorption / denitrification cylinder 313b—orifice 317b—communication pipe 314c—orifice 317a -1 Nitrogen absorption and denitrification cylinder 312b-Communication pipe 314b-Moisture absorption and dehumidification cylinder 312a-Communication pipe 314a- By alternately switching the second route of the rotary valve 311 and repeating the pressure equalization, oxygen gas exceeding the predetermined pressure is supplied and stored in the oxygen tank 316 via the check valve 315 branched from the communication pipe 314c. This is an apparatus that supplies oxygen gas to the oxygen supply pipe 302.
Specific example 2 of the oxygen concentrating device 301 of the oxygen blowing device is shown in FIG.
The specific example 2 shown in (2) of FIG. 2 is different from the specific example 1 in that the moisture absorbing / releasing cylinders 312a and 313a of the specific example 1 are deleted and the nitrogen absorbing / releasing cylinder 312b is replaced by 314a and 314b. Direct communication with the rotary valve 311; the nitrogen absorption and denitrification cylinder 313b directly communicates with the rotary valve 311 through the communication pipes 314d and 314e; and the cooling pipe 320 and moisture through the communication pipe 310a between the rotary valve 311 and the pneumatic feed pump 310. The separation cyclone 321 is connected in communication, and the other components are the same as those in the first specific example. In other words, this example is an apparatus that removes moisture in the air supplied to the rotary valve 311 in advance.
2. Description of raw laver storage method An example of storage method using the above storage device example will be introduced.

Seawater at a predetermined temperature is used as the storage water, and this is stored in the storage container 100. Live laver, seaweed, etc. are charged into the storage container 100, and this is stirred by the large and small impellers 203 and 204. Oxygen is blown into the seawater in the storage container 100 from the aeration nozzle 303 installed on the bottom 102 of the 100 through the cover nozzle 305, and the raw laver is stirred while maintaining the oxygen concentration in the seawater in the container within a predetermined range. Specific conditions, specific examples of the results, and comparative examples are shown in Tables 1 to 5.
As a result, the present invention examples: specific examples 1 to 3 show that the dissolved oxygen in seawater is drastically reduced immediately when laver is charged, and the dissolved oxygen in seawater increases rapidly when laver is loaded. Is active in oxygen respiration and carbon dioxide assimilation. And it shows a good storage curing effect in one storage time, there is no elution pigment from cells of nori, gloss and color are better than before treatment and activated, and the volume is also increasing. Furthermore, there was no clogging of the diffuser nozzle 303. Moreover, the supply amount of oxygen per unit time with respect to the amount of laver charged was 2.0 to 2.5 L / min / ton on average, and a very efficient storage curing effect was obtained with a small amount of oxygen.
On the other hand, in Comparative Example 1, dye elution from the seaweed cells occurred, and the gloss and color were lower than before treatment, indicating that oxygen respiration and carbon dioxide assimilation were significantly reduced. Therefore, the superiority of the method and apparatus of the present invention could be confirmed.

The present invention uses the above-described method and apparatus to maintain a sufficient amount of oxygen respiration and carbon dioxide assimilation for live seaweed collected at sea in an activated state equivalent to or higher than that when the seaweed was collected. In addition, it can be supplied to the next processing step in a good state with no pigment elution from the seaweed cells, and exhibits excellent effects such as the ability to produce a processed seaweed product with excellent quality. Thus, the present invention has a very high possibility of effective utilization in the fishery industry, and makes a great contribution to this kind of industry.

It is explanatory drawing which shows the whole of one Example of the storage apparatus of the raw laver of this invention. (1) is a block diagram of Example 1 using a rotary valve oxygen concentrator as the oxygen concentrator. (2) is a block diagram of a specific example 2 of the rotary valve type oxygen concentrator. FIG. 2 is a detailed enlarged explanatory view of a main part of the air diffusion nozzle shown in FIG.

Explanation of symbols

100 storage container
200 Stirrer
300 oxygen blower
101 loading
102 Bottom
103 inner wall
201 Rotation drive motor device
202 vertical shaft
203 large impeller
204 small impeller
301 oxygen concentrator
302 Oxygen supply pipe
303 Air diffuser nozzle
305 Cover nozzle
306 Oxygen outlet
310 Pneumatic feed pump
311 Ceramic rotary valve
312a, 313a Moisture absorption / release tube
312b, 313b
314a, 314b, 314c, 314d, 314e Communication pipe
317a, 317b Orifice
315 Check valve
316 oxygen tank
320 Cooling machine
321 Cyclone for separation of moisture

Claims (2)

  When charging and storing live seaweed, seaweed, etc. in a container containing seawater or fresh water, oxygen is continuously blown from the bottom of the container, and a stable dissolved oxygen concentration in a state where no seagrass is charged is 15 mg. A method for storing fresh seaweed, characterized in that it is stored while maintaining an oxygen blowing amount of not less than / L.   In a storage device for storing seaweed, seaweed, etc. that lived with seawater or fresh water in a container and stirring them with a stirrer, an aeration nozzle connected to the oxygen concentrator via an oxygen supply pipe is disposed at the bottom of the container, An apparatus for storing fresh laver comprising an oxygen blowing device in which a cover nozzle having an ejection hole is disposed around the aeration nozzle.

Images