JP2006142167A - Filtered and sterilized cold seawater production method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filtered and sterilized cold seawater production method and apparatus which can obtain filtered and sterilized cold seawater which is steadily kept cold and sterilized, and safe as water for treating fish and shellfish, and can be always taken out. <P>SOLUTION: Pumped up seawater is filtered, and sterilized by a sterilizing device 6 to be converted to filtered and sterilized seawater, which is cooled during its circulation between a production chamber 10 and a water cooler 12, and stored in a water storage chamber 11 of a water storage tank. A part of the filtered and sterilized seawater in the water storage chamber 11 is taken out, and it is kept cold at a preset temperature by a cold insulation device 22, and resterilized by a sterilizing device 23 during return to the water storage chamber 11 again. While this circulation is repeated, the filtered and sterilized cold seawater which is kept cold at the preset temperature and sterilized is always obtained in the water storage chamber 11. Filtered and sterilized water and the filtered and sterilized cold seawater can be always taken out from an outlet 25 and an outlet 26 respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a filtered sterilized cold seawater production method and apparatus for producing filtered and sterilized cold seawater used for maintaining freshness and hygiene management of fresh fishery products.

  Conventionally, cold seawater used to maintain the freshness of fresh seafood is pumped into a fish tank or storage tank in a ship, and crushed ice is added to and mixed in the pumped seawater to lower the temperature of this seawater. The cold seawater obtained and stored in the tank was stored in the tank. And the cold seawater that is stored is used as a closing water for fish on a ship, used to cool fish that are harvested in a fish tank, or transferred from a water storage tank as shower water for a sorter at a landing site. in use.

  However, in the conventional cold seawater production and storage method, crushed ice produced from fresh water is introduced into seawater, so the salt concentration of seawater decreases as the crushed ice melts. When such cold seawater is used as fish water closing water or sorter shower water, a phenomenon occurs in which water penetrates into fish meat due to the action of osmotic pressure and the quality of the meat deteriorates. In addition, crushed ice may collide with seafood when transported by fishing boats or vehicles, and the meat quality may be damaged. Furthermore, in the conventional method for producing cold seawater, the work of putting crushed ice into seawater and mixing it is very troublesome, and even if crushed ice is put into seawater and mixed, There was a problem that a temperature difference occurred between the lower water part and the temperature of the entire seawater was not uniform.

Therefore, the present applicant has already proposed a cold seawater production and storage method and apparatus (see Patent Document 1). According to this cold seawater production and storage method and apparatus, the seawater is automatically pumped up to fill the adiabatic storage tank, and when the adiabatic storage tank is full, the seawater is automatically cooled, When seawater is cooled to the set temperature, the cooling is automatically stopped. Therefore, cold seawater can be produced and stored without the work of introducing and mixing crushed ice into the seawater, and as a result, the salt concentration of seawater can be kept constant and the temperature of the entire cold seawater can be kept constant. It can be made uniform. According to this proposal for production and storage of cold seawater, the work of throwing crushed ice into the seawater and mixing it is unnecessary, keeping the salinity of seawater constant and keeping the temperature of the entire cold seawater uniform. be able to.
JP-A-5-20331 (paragraphs [0009] to [0011], FIG. 1)

Moreover, the manufacturing method and apparatus of the cold seawater which manufactures the cold seawater for maintaining the freshness of seafood in large quantities are proposed. According to this proposal, after the seawater from which solid substances such as sand have been removed by the filtration device is introduced into the ozone treatment tank, the microorganisms contained in the seawater are sterilized by the injected ozone, and then the microorganisms killed in the separation tank When organic substances such as bubbles are removed from the system by bubbles, residual oxidants contained in the seawater are removed in the activated carbon filtration tank, and a certain amount of filtered and sterilized seawater accumulates in the water tank automatically. To the cold storage tank, cooled to a predetermined temperature in the upper cooling tank, stored in the lower cold seawater storage tank, and supplied outside the system as needed.
JP 2002-59171 A (paragraphs [009] to [0025], FIG. 1)

  However, the system that automatically cools seawater when the insulated water storage tank is full requires time to equalize the temperature of the entire cold seawater. It is difficult to provide cold water at any time. In addition, the water level of the water storage tank fluctuates in accordance with the supply of cold seawater, and there is a high possibility that air will flow in from the outside, leaving room for improvement from the viewpoint of hygiene management.

  In the method of automatically sending to the cold water tank when a certain amount of filtered and sterilized seawater accumulates in the water tank, as a cooling tank or cold seawater water tank, in order to meet the demand for the amount of water supplied outside the system, A large aquarium is used. However, depending on the state of use, the water level of the large water tank fluctuates, and it is difficult to avoid the air entering and leaving the outside of the cooling tank and the water tank. General bacteria are floating in the air, and seabirds often fly and stop in fishery-related facilities, and seabird droppings adhere to the facility and dance in the air around the facility. Sometimes. Therefore, if no special measures are taken, or if measures are taken to the extent that a simple filter is provided, various bacteria and viruses (hereinafter referred to as “bacteria”) are suspended in the cooling and storage tanks in the form of floating in the incoming and outgoing air. May enter). A high-performance filter device that removes bacteria in the air may be used. However, such a device is expensive, and there is a problem that the manufacturing cost and maintenance cost of the system increase.

  Therefore, by cooling the pumped seawater, it is safer to filter sterilize by reducing the number of bacteria and viruses in seawater as processed water for seafood used for tightening seafood and washing during sorting, or for shipping seafood. There is a problem to be solved in terms of obtaining cold seawater.

  The objective of this invention is providing the filtration sterilization cold seawater manufacturing method and apparatus which can obtain the filtration sterilization cold seawater which can carry out constant water cooling and sterilization, and can always take in water.

  The method for producing filtered sterilized cold seawater according to the present invention is a method for producing filtered sterilized cold seawater in which the filtered and sterilized seawater is filtered and sterilized and then cooled to a set temperature in a storage tank and stored. During the circulation of taking out the filtered sterilized cold seawater and returning it to the water storage tank, the filtered sterilized cold seawater is cooled and re-sterilized at the set temperature.

  According to this filtered sterilized cold seawater manufacturing method, the pumped seawater is filtered and sterilized to become filtered sterilized seawater, which is cooled to a set temperature and stored in a water storage tank. Even if the filtered sterilized cold seawater in the water storage tank is initially cooled to the installation temperature, the temperature gradually changes from the set temperature by heat exchange through the water storage tank. Moreover, even if it is initially sterilized, bacteria and the like may grow while staying in the water storage tank. Filtered sterilized cold seawater in the water tank is taken out and returned to the water tank, where it is cooled and re-sterilized at the set temperature. During this cycle, the water tank is always set. A filtered sterilized cold seawater kept at a temperature and sterilized is obtained.

  The filtration sterilized cold seawater production apparatus according to the present invention includes a filtration / sterilization system for filtering and sterilizing pumped seawater, a cooler for cooling the filtered sterilized seawater to a set temperature, and a filter sterilized cold seawater cooled by the cooler. And a cooling / water storage system for filtered sterilized cold seawater having a water storage tank for storing water, further comprising a circulation system for taking out the filtered sterilized cold seawater in the water storage tank and returning it to the water storage tank. The system is characterized in that the filtered sterilized cold seawater taken out is cooled and re-sterilized at the set temperature.

  According to this filtration sterilization cold seawater production apparatus, the filtration / sterilization system filters and sterilizes the pumped seawater. The cooling / water storage system cools the filtered sterilized seawater to a set temperature by a cooler, and stores the filtered sterilized cold seawater obtained by the cooling in a water storage tank. The filtration sterilized cold seawater production apparatus is provided with a circulation system that takes out the filter sterilized cold seawater from the storage tank and returns it to the storage tank. In the circulation system, the set temperature of the filtered sterilization cold seawater taken out for circulation is provided. Refrigerate and re-sterilize in Therefore, the filtered sterilized cold seawater in the water storage tank is maintained at the set temperature while being circulated even if the temperature rises, for example, and is circulated even if there is growth of bacteria or the like. Since the sterilization process is performed again in the meantime, the filtered sterilized cold seawater which is kept at the set temperature and substantially free of bacteria is returned to the water storage tank. While repeating such a circulation, filtered sterilized cold seawater that is always kept at a set temperature and sterilized in the water storage tank is obtained.

  In this filtered sterilized cold seawater production method and apparatus, it is desirable to use filtered or sterilized cold seawater that is at room temperature or cooled as treated water for seafood that is not contaminated with bacteria as much as possible. Therefore, in the filtered sterilized cold seawater production method, the filtered sterilized seawater before being stored in the water storage tank can be taken out to the outside, and the filtered sterilized cold seawater before being returned to the water storage tank is stored and sterilized during circulation. It is preferable that it can be taken out. Further, in the filter sterilized cold seawater production apparatus, the filtration / sterilization system includes a filter sterilization seawater extraction section that enables the filtration sterilization seawater before being stored in the water storage tank to be taken out, and the circulation system is cooled and sterilized and stored in water. It is preferable to provide a filter sterilized cold seawater take-out section that allows the filter sterilized cold seawater before returning to the tank to be taken out to the outside. By taking out the filtered sterilized seawater before storing in the water storage tank to the outside, the sanitary room temperature filtered sterilized seawater immediately after being sterilized can be used as treated water for seafood. In addition, it is possible to use sanitary filtered sterilized cold seawater immediately after sterilization as processed water for seafood by taking out the filtered sterilized cold seawater that has been kept cool and sterilized during circulation and before returning to the water storage tank. it can.

  If the pumped-up seawater is cooled in a single tank system, standby time is required to cool the seawater at room temperature, and it is not possible to always respond to the demand for cold seawater. Therefore, in this filtered sterilized cold seawater manufacturing method, filtration sterilized seawater is poured into a manufacturing tank constituting a part of the water storage tank, and the seawater taken out from the manufacturing tank is cooled and returned to the manufacturing tank repeatedly for filtration. Produces sterilized cold seawater, stores filtered sterilized cold seawater in the water tank that forms the remainder of the water storage tank, and cools and sterilizes it while circulating the filtered sterilized cold seawater stored in the water tank back to the water tank. It is preferable. Moreover, in the filtration sterilized cold seawater production apparatus, the water storage tank of the cooling / water storage system is repeatedly manufactured by injecting the filter sterilized seawater and cooling back the seawater taken out for producing the filter sterilized cold seawater. A configuration including a tank and a water storage tank in which the produced filtered sterilized cold seawater is stored and in which circulation is performed to cool and return the seawater taken out for cooling and re-sterilization is preferable. According to such a filtration sterilized cold seawater manufacturing method and apparatus, it is possible to always take out sanitary filtered sterilized seawater or filtered sterilized cold seawater immediately after being sterilized at a constant temperature. In addition, cold seawater can be replenished from the manufacturing tank while taking out cold seawater from the water storage tank, so that the demand for cold seawater can be met at any time and a system that is always available can be prepared.

  This filtration sterilization cold seawater manufacturing method and apparatus can be configured such that the water storage tank is installed on land or installed on a ship. In other words, the present method and apparatus can be installed on land and used in fishery-related facilities, and can also be used for processing seafood on the ocean by installing on a ship.

  The filtered sterilized cold seawater production method and apparatus according to the present invention are configured as described above, and the filtered sterilized cold seawater is partially circulated in a water storage tank, and is cooled and sterilized at a set temperature during the circulation. Since the treatment is performed, the contamination of the filter sterilized cold seawater caused by the fluctuation of the temperature of the filter sterilized cold seawater and the possibility that bacteria in the outside air enter the water storage tank can be suppressed as much as possible. Also, as before, cold seawater can be produced and stored without the work of adding and mixing crushed ice produced from fresh water into seawater, so it keeps constant without reducing the salinity of seawater, Moreover, the temperature of the entire cold seawater can be made uniform. And even if such cold seawater is used as the closing water of a fish body or the shower water of a sorter, it will not have a bad influence on a fish body.

  Hereinafter, the structure of the filtration sterilization cold seawater manufacturing apparatus by this invention is demonstrated in detail based on drawing shown as an Example. FIG. 1 is a conceptual diagram showing an embodiment of a filtration sterilized cold seawater production apparatus according to the present invention. The filtered sterilized cold seawater production apparatus shown in FIG. 1 is a seawater supply system 1 that pumps up and supplies seawater, and produces and stores cold sterilized cold seawater from the seawater supplied by the seawater supply system 1. The system 2 includes a cooling / sterilization system 3 that cools and re-sterilizes the filtered sterilized cold seawater manufactured and stored in the manufacturing / water storage system 2.

  First, the seawater supply system 1 will be described. The seawater supply system 1 includes a water supply pump 4 that pumps seawater as raw water, a sand filter 5 that filters sand in seawater pumped by the water supply pump 4, and a sand filter. A sterilizer 6 for sterilizing the seawater, and a pumping pipe 7 for connecting these devices. The pumping pipe 7 is connected to the suction side of the water supply pump 4 and is used to remove the solid foreign matter in the seawater by being thrown into the seawater, and the production / water storage system 2 side An electric control valve 9 for controlling the pumping amount to the water storage system 2 is provided. Further connected to the pumping pipe 7 is a filter sterilization treated water outlet 25 which can take out normal filtered sterilization treated water before cooling on the downstream side of the sterilizer 6 and upstream of the electric control valve 9. Has been.

  The production / water storage system 2 includes a two-tank tank including a production tank 10 for producing cold seawater and a water tank 11 for storing the produced cold seawater. The production tank 10 has a capacity of 1 t, for example, and the water storage tank 11 has a capacity of 10 t. Since the two-tank tank stores cold seawater, it is preferably configured as an adiabatic tank in order to minimize heat exchange with the outside. The filtered sterilized seawater supplied from the seawater supply system 1 is supplied to the production tank 10 through the electric control valve 9. The production / water storage system 2 also includes a chilled water machine 12 that cools the stored seawater, a water storage circulation pump 13 that circulates the stored seawater to the chilled water machine 2, and a water storage circulation pump 13 and a chilled water machine 2 from below the production tank 10. And a circulation piping system 14 that returns to the production tank 10. The circulation piping system 14 includes a valve 15 on the outlet side of the production tank 10, and an electric switching valve 16 that switches the filtered sterilized seawater cooled by the chilled water machine 2 to the side that returns to the production tank 10 and the side that sends it to the water storage tank 11. ing.

  In the filter sterilized cold seawater production apparatus, the seawater supply system 1 automatically pumps the filter sterilized seawater to fill the production tank 10, and when the production tank 10 reaches a predetermined water level (for example, full water), the flow switch (Not shown) works to stop the water supply operation of the water supply pump 4 (do not drain the drain water and send it to the production tank 10) and operate the water cooler 12 to automatically cool the filter sterilized seawater. When the seawater in the production tank 10 is cooled to the set temperature, a thermostat (not shown) is activated and the cooling by the chiller 12 is automatically stopped. Therefore, in the initial operation period of the apparatus until the production tank 10 reaches a predetermined water level, and in the cooling operation period in which the cooler 12 starts to operate, the filtered sterilized seawater is being cooled at the temperature at which water is taken or from that temperature. is there.

  When the filtered sterilized seawater in the production tank 10 is cooled to a predetermined temperature such as 0 ° C. to 1 ° C., the electric switching valve 16 is switched while the water circulation pump 13 is operated to obtain the cooled water. The filtered sterilized cold seawater is sent to the water storage tank 11. When a certain amount of filtered sterilized cold seawater is stored in the water storage tank 11, a required amount of filtered sterilized cold seawater is taken out of the water tank 11 according to the needs of customers, for example, for automatic ice making as shown in the figure. Is acceptable. When the water level of the water storage tank 11 fluctuates in accordance with the removal of the filtered sterilized cold seawater, the change in the water level is detected by a predetermined sensor, and the filtered water cooled to a predetermined temperature from the water cooler 12 according to the detected amount The sterilized cold seawater is supplied to the water storage tank 11 through the electric switching valve 16 to return the water level of the water storage tank 11 and prepare for the subsequent removal of the filtered sterilized cold seawater. A normal temperature filtered sterilized seawater is supplied from the seawater supply system 1 into the manufacturing tank 10 in accordance with a drop in the level of the filtered sterilized seawater in the manufacturing tank 10. Hereinafter, by repeating the above procedure, the water storage tank 11 can respond to the demand for filtered sterilized cold seawater at any time. Moreover, the filter sterilized cold seawater is produced in the production tank 10 and the filter sterilized water in the water tank 11 is filtered. The cold seawater is ready for refilling.

  The production tank 10 and the water storage tank 11 are large-diameter tanks, and the water level rises and falls according to the consumption of cold seawater, and it is difficult to avoid the air entering and leaving the upper part of the tank accordingly. . In addition, dust, bacteria and viruses are floating in the foreign matter attached to the tank or in the air itself, and if bacteria enter the tank, there is a possibility of causing contamination of the tank inner wall or contamination of cold seawater. There is not preferable. Therefore, this filtered sterilized cold seawater production apparatus is equipped with a cold insulation / sterilization system 3.

  The cold insulation / sterilization system 3 is connected to the lower part of the water storage tank 11 and returns to the upper part of the water storage tank 11 again, and the water storage circulation pump 21 provided in the circulation pipe 20 in order along the flow direction. And a cooler 22 and a sterilizer 23. The water circulation pump 21 may be equivalent to the water circulation pump 13 of the production / water storage system 2, and the sterilization device 23 may be the same as the sterilization device 6 provided in the seawater supply system 1. The cold insulator 22 may be equivalent to the cold water machine 12 of the production / water storage system 2, but is intended to maintain the temperature of the filtered and sterilized cold seawater, and therefore has a cooling capacity as high as that of the cold water machine 12. It does not have to be. A filtered sterilized cold seawater outlet 26 is connected from the sterilizer 23 to which the filtered sterilized cold seawater that has just been sterilized can be taken off from the return pipe of the water storage tank 11.

  The action of the cold insulation / sterilization system 3 is that the temperature of the filtered and sterilized cold seawater is maintained almost constant in the water storage tank 11, but it may be difficult to avoid temperature changes depending on the season. Moreover, when a large amount of cold seawater is consumed, a temperature rise may occur. In such a case, a part of the cold seawater in the water storage tank 11 is taken out to the circulation pipe 20, cooled by the cold insulator 22, and then returned to the water storage tank 11. Further, general bacteria in the air that may enter the water storage tank 11 are sterilized by the sterilizer 23 when re-sterilizing the cold seawater passing through the circulation pipe 20. A part of the cold seawater in the water tank 11 is taken out, and after the cold water that has been taken out is cooled and re-sterilized, it is returned to the water tank 11 again and again. Cold seawater can be maintained at a temperature in the vicinity of 0 ° C. and more completely sterilized.

  As described above, in the seawater supply system 1, normal temperature filtered sterilized water having the same salt concentration as the seawater concentration before cooling can be extracted from the filtered sterilized water outlet 25. Further, in the cold insulation / sterilization system 3, the filter-sterilized cold seawater in a low temperature state cooled to a temperature around 0 ° C. (preferably 0 ° C. to 1 ° C.) can be taken out from the filter-sterilized cold seawater outlet 26. . A cold seawater transfer pump and a fountain machine on the downstream side thereof can be installed at the tip of the take-out port 25, 26, and used as shower water for the sorter at a landing site in a fishing port. Thus, according to this filtered sterilized cold seawater production apparatus, two types of filtered sterilized seawater can be individually and arbitrarily taken out from the separate outlets 25 and 26, respectively. If there is sufficient seawater supply capability, it can be continuously taken out.

  The adiabatic water storage tank 1 can be of a type that is installed directly on land or via a gantry, or a type that is installed on a ship using a fish tank (not shown) of the ship. Furthermore, this thermal insulation type water storage tank can use a large thing about 5-10 t, for example, or a small thing about 1 t. Even when a small one of about 1 t is used, the produced cold seawater can be transferred to a large one of about 5 to 10 t. In addition, the capacity | capacitance of a tank is not restricted to these, It can change suitably according to a demand and cooling capacity.

  Moreover, the filtration sterilization cold seawater manufacturing apparatus by this invention can shorten the cold seawater manufacturing time or can increase the manufacturing capacity of cold seawater by providing the plurality of cold water machines 12. Furthermore, although the sterilizers 6 and 23 may be devices using ozone, an ultraviolet sterilizer that does not use ozone is preferable to avoid the possibility of taste stimulation. In the case of an ultraviolet sterilizer, the efficiency of the ultraviolet lamp can be increased by increasing the frequency of the commercial power supply using an inverter. In addition, it is possible to make effective use of the reflected ultraviolet light on the mirror surface by adopting an internally-illuminated type in which the ultraviolet lamp is placed at the center of the tubular chamber provided outside and the inner surface of the tubular chamber having a mirror finish.

It is explanatory drawing which shows one Example of the apparatus for implementing the cold seawater manufacture water storage method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seawater supply system 2 Cold seawater production and storage system 3 Cooling and sterilization system 4 Water supply pump 5 Sand filter 6 Sterilizer 7 Pumping pipe 8 Strainer 9 Electric control valve 10 Manufacturing tank 11 Water tank 12 Cold water machine 13 Water circulation pump 14 Circulation Piping system 15 Valve 16 Electric switching valve 20 Circulation piping 21 Water storage circulation pump 22 Cooling machine 23 Sterilizer 25 Filtration sterilization treated water outlet 26 Filtration sterilization cold seawater outlet

Claims (8)

  In the method for producing filtered sterilized cold seawater, after filtering and sterilizing the pumped seawater, cooling the sterilized seawater to a set temperature in a water storage tank and storing the water, taking out the filtered sterilized cold seawater in the water storage tank and taking the water A filtered sterilized cold seawater production method, wherein the filtered sterilized cold seawater taken out is refrigerated at the set temperature and re-sterilized during circulation to return to the tank.   The filtered sterilized seawater before being stored in the water storage tank can be taken out to the outside, and the filtered sterilized cold seawater that has been kept cool and sterilized during the circulation and before returning to the water storage tank can be taken out to the outside. The filtration sterilized cold seawater production method according to claim 1, wherein:   The filtered sterilized seawater is manufactured by injecting the filtered sterilized seawater into a manufacturing tank constituting a part of the water storage tank, cooling the seawater taken out from the manufacturing tank and returning it to the manufacturing tank. , The filtered sterilized cold seawater is stored in a water tank constituting the remainder of the water storage tank, and the filtered sterilized cold seawater stored in the water tank is partially taken out and returned to the water tank during the circulation. 3. The filtration sterilized cold seawater production method according to claim 1 or 2, wherein re-sterilization treatment is performed.   The method for producing filtered sterilized cold seawater according to any one of claims 1 to 3, wherein the water storage tank is of a type installed on land or a type installed on a ship.     Filtration / sterilization system for filtering and sterilizing the pumped seawater, cooling sterilization cooling provided with a cooler for cooling the filtered sterilized seawater to a set temperature, and a storage tank for storing filtered sterilized cold seawater cooled by the cooler In a manufacturing apparatus having a seawater cooling / water storage system, the manufacturing apparatus further includes a circulation system for taking out the filtered sterilized cold seawater in the water storage tank and returning the filtered sterilized cold seawater to the water storage tank. A filtration sterilized cold seawater production apparatus characterized by performing cooling and re-sterilization at a set temperature.   The filtration / sterilization system includes a filtration / sterilization seawater take-out portion that enables the filtration / sterilization seawater to be taken out before being stored in the water storage tank, and the circulation system is cooled / sterilized and before returning to the water storage tank. The filtration sterilized cold seawater extraction device according to claim 5, further comprising a filtration sterilized cold seawater extraction unit that enables the filtration sterilized cold seawater to be taken out to the outside.   The water storage tank of the cooling / water storage system was manufactured with a manufacturing tank in which the filtered sterilized seawater was injected and the seawater taken out to manufacture the filtered sterilized cold seawater was repeatedly cooled and returned. A water storage tank that stores the filtered sterilized cold seawater and cools and returns the seawater taken out for performing the cold insulation and re-sterilization treatment. 6. The filtration sterilized cold seawater production apparatus according to 6. The filtration sterilized cold seawater production apparatus according to any one of claims 5 to 7, wherein the water storage tank is of a type installed on land or a type installed on a ship.

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