JP2003285053A - Production apparatus of sterilized seawater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production apparatus for efficiently producing a large amount of cold seawater for preserving the freshness of fishes and shellfishes at the level of the drinking water standard. <P>SOLUTION: The production apparatus of sterilized seawater is composed of a compaction filter 1 that filtrates intake seawater through a filtering medium under pressure, a treated seawater tank 2 into which the seawater filtered by the compaction filter 1 is made to flow, a cold seawater tank 3 into which the seawater is made to flow from the treated seawater tank 2, a cooler consisting of a chilling unit 4 for cooling the seawater drawn out of the cold seawater tank 3 and an air condenser 5, a circulating system consisting of a cold seawater circulating pump 26 for circulating the seawater between the cooler and the cold seawater tank 3 and circulating piping 34, 35, a first ultraviolet sterilizer 6 installed on the outlet side of the treated seawater tank 2, a second ultraviolet sterilizer 7 installed on the outlet side of the cold seawater tank 3, and a treated seawater discharge part 8 for discharging the seawater from each of the ultraviolet sterilizers 6, 7. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production apparatus for producing seawater or cold seawater of a quality higher than tap water from seawater.

[0002]

[Background Art] [Problems to be Solved by the Invention] Fish and shellfish landed at a fishing port or the like is sorted according to type, size, etc., and tanks, trays, aquariums, etc. using cold seawater obtained by putting ice into seawater are obtained. It is customary to ship products by using the so that the freshness of seafood can be maintained.

Many kinds of dust, impurities, etc. are contained in natural seawater and freshwater (when simply referred to as "seawater" in this specification, not only so-called seawater but also natural freshwater except tap water, etc.) are included. Not only naturally-occurring microorganisms, bacteria, etc., but also extremely large amounts of human-derived substances (hereinafter simply referred to as impurities refer to all those contained in seawater and freshwater. ). Therefore, the cold seawater used for the above-mentioned uses has been purified by removing impurities such as sand by a filtering device called a sand filtering device and performing chlorine sterilization or ozone sterilization.

However, in the conventional apparatus and method for filtration and sterilization, although relatively large impurities such as dust and sand can be removed among the above-mentioned impurities, Escherichia coli, Vibrio parahaemolyticus, SRSV (small spherical It has not been able to remove and sterilize bacteria such as viruses) etc., for example, a water supply that is defined by the Ministry of Health, Labor and Welfare, "color chromaticity of 5 degrees or less, turbidity of 2 degrees or less, general bacteria, E. coli, etc." Of course, the standard of properties that water should have could not be cleared.

Of course, since the treated seawater as described above is not directly consumed by consumers, it is not appropriate to apply the water quality standard for tap water to seawater. However, after all, if the seafood that enters the mouth of the consumer is put in this level of treated seawater and shipped, the seafood that has not been removed or sterilized remains attached to some extent, or the seafood that has proliferated is eaten by the consumer. It may happen that some kind of infectious disease may start. Therefore, when shipping using treated seawater of a conventional level, it is conceivable that the commercial value of seafood will be reduced due to problems with safety as food. Furthermore, in recent years, even those that cause symptoms such as severe diarrhea when entering the human body, influenza-like nausea, such as pathogenic protozoa Cryptosporidium that do not die even with chlorine disinfection, exist in seawater through rivers, etc. It's happening. Therefore, it has been earnestly desired to use seawater treated to the level of tap water for storing and shipping seafood.

In view of the above situation, the present invention has an object to provide a manufacturing apparatus for efficiently manufacturing a large amount of cold seawater for maintaining the freshness of fish and shellfish on the basis of tap water level. To do.

[0007]

In order to achieve the above object, the apparatus for producing sterilized seawater according to claim 1 of the present invention is a compaction method for pressurizing the taken seawater while passing it through a filter medium for filtration. A filtering device, a treated seawater tank for inflowing seawater filtered by the compaction filtering device, a cold seawater tank for inflowing seawater from the treated seawater tank, a cooling device for cooling the seawater extracted from the cold seawater tank, and A circulation system that circulates seawater between a cooling device and the cold seawater tank, a first ultraviolet sterilizer provided on the outlet side of the treated seawater tank, and a second ultraviolet sterilizer provided on the outlet side of the cold seawater tank. Ultraviolet sterilizer, the first ultraviolet sterilizer and the second
It is characterized by comprising a drainage system for discharging seawater from each of the ultraviolet sterilizers.

In order to achieve the above-mentioned object, the second aspect of the present invention is the apparatus for producing sterilized seawater according to the first aspect,
A backwash system is provided between the treated seawater tank and the compaction filtration device, and the compaction filtration device can be washed with seawater fed under pressure from the treated seawater tank.

In order to achieve the above object, the sterilized seawater producing apparatus according to the second aspect of the present invention comprises:
An air backwash system is provided in the pressure filtration apparatus, and the pressure filtration apparatus can be washed with air fed from the air backwash system and seawater fed from the treated seawater tank.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments and examples of a sterilized cold seawater producing apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of an apparatus for producing sterilized cold seawater according to the present invention. In the figure, 1 is a consolidation filter, 2
Is a treated seawater tank, 3 is a cold seawater tank, 4 is a cooling unit, 5 ... is an air-cooled condenser, 6 is a first ultraviolet sterilizer, 7 is a second ultraviolet sterilizer, and 8 is a treated seawater drainage unit.

The compaction filtration device 1 is a device in which a polyethylene terephthalate chip filter medium is placed in a cylindrical vertical housing, and the filter medium is pressed by a piston while the raw water to be filtered is placed and the filtered water is discharged. , For example, the tip filter medium has a diameter of 12 mm, a length of 12 mm, and a bulk density of 70.
About 95% of impurities having g / l, a fiber diameter of 17 to 20 μm, a filtration rate of 6 m ³ / hour and a filtration accuracy of 1 μm or more can be removed. Those made by Sasakura Service Center Co., Ltd. can be adopted. Needless to say, a filtration device to which a membrane treatment for filtering out water stains with an ultrafine fiber membrane is applied, or one using hollow fibers can be employed.

A seawater intake pipe 10 is connected to the compaction filtration device 1 via a filtration pump 11 and the like, and a backwash blower 12 and a backwash air pipe 13 forming an air backwash system are also connected. Further, the treated seawater discharge pipe 14 of the consolidation filter 1
Is connected to the treated seawater tank 2. In the figure, 15 is a bypass pipe of the intake pipe 10, 16 is a cleaning drainage pipe, 17
Is a bypass pipe of the treated seawater discharge pipe 14.

The treated seawater tank 2 is for always storing a fixed amount of treated seawater, for example, 100 m ³ of treated seawater that has been filtered by the compaction filtration device 1 and sent through the treated seawater discharge pipe 14. For example, it is made of FRP panel or the like. The treated seawater tank 2 is connected to the treated seawater discharge pipe 14, and is also provided with a backwash pipe 19 including a backwash pump 18 of the compaction filtration device 1.
It is connected to the backwashing air pipe 13 of the compaction filtering device 1. The treated seawater tank 2 has a treated seawater supply pump 2
A treated seawater supply pipe 21 including 0 is provided and is connected to the first ultraviolet sterilizer 6. Further, the water supply pipe 22 of the treated seawater tank 2 is connected to the cold seawater tank 3 via a water absorption pump 23. Reference numeral 24 in the figure is a level sensor that detects the water level of the treated seawater in the treated seawater tank 2. Reference numeral 25 in the figure denotes a temperature sensor that detects the temperature of the treated seawater in the treated seawater tank 2.

In the cold seawater tank 3, the treated seawater sent from the treated seawater tank 2 by the water absorption pump 23 through the water supply pipe 22 is kept at a constant temperature, for example, 50 m ³ of treated seawater is always kept at a constant temperature. The treated seawater tank 2 is made of, for example, an FRP panel. The cold seawater tank 3 is, of course, connected to a water supply pipe 22, and a treated seawater circulation outlet pipe 27 provided with a treated seawater circulation pump 26 is provided, which is connected to the cooling unit 4. Further, the cold seawater tank 3 is provided with a cold seawater supply pipe 29 including a cold seawater supply pump 28.
It is connected to the ultraviolet sterilizer 7. In the figure, 30 is a level sensor, which detects the water level of the cold seawater in the cold seawater tank 3. Further, in the figure, 31 is a temperature sensor for detecting the temperature of the cold seawater in the cold seawater tank 3, 33 is a pressure tank for automatic start / stop, and 34 is a circulation pipe arranged between the cooling unit 4 and the cooling unit 4.

The cooling unit 4 and the plurality of air-cooled condensers 5 constitute a cooling device for cooling the seawater extracted from the cold seawater tank 3. Of course, the numbers of the cheering units 4 and the air-cooled condensers 5 are not limited to the numbers in the illustrated example. In the figure, reference numeral 35 denotes a circulation pipe connecting between the cooling unit 4 and the air-cooling condenser 5.

The first ultraviolet sterilizer 6 and the second ultraviolet sterilizer 7 have a treatment capacity of, for example, 24 m ³ / hour, and are connected to the treated seawater supply pipe 21 and the cold seawater supply pipe 29, respectively, and the treated seawater drainage section 8 is provided. The treated seawater or cold seawater sterilized with ultraviolet rays is supplied to the. As this ultraviolet sterilizer, for example, a high output ultraviolet water sterilizer manufactured by Funatech Co., Ltd. can be used.

The treated seawater drainage section 8 includes a pipe 36 for discharging treated seawater, a pipe 37 for discharging cold seawater, and both pipes 36,
The water supply device (not shown) is provided at the outlet of 37. As the water supply device, various devices such as a faucet-like water supply device and a flexible hose provided at a gas station with a nozzle provided at the tip thereof can be used. If water is to be supplied to a tank or the like mounted on a loading platform such as a truck, the latter type is suitable. Further, the pipe 36 for discharging cold seawater may be connected to a subsequent system such as an ice making device.

Next, the operation of the entire system will be described. Since the operation control of the system as described below is performed by adopting various known control modes and control systems such as control by hardware and control by software system, the illustration and description of the control means and the system itself are omitted.

Seawater taken from an unillustrated intake port or seawater from an unillustrated tank or the like is put into the consolidation filter device 1 via the intake pipe 10, the filtration pump 11, etc., and inside the housing thereof, as described above. It is filtered and sent to the treated seawater tank 2 through the treated seawater discharge pipe 14. A certain amount of treated seawater is always stored in the treated seawater tank 2, and the treated seawater supply pump 20 is driven as necessary to send the treated seawater to the first ultraviolet sterilizer 6 through the treated seawater supply pipe 21 to emit ultraviolet light. It is sterilized by and is supplied to the outside through a pipe 36 for discharging the treated seawater of the treated seawater drainage section 8.

If necessary, the water suction pump 23 is driven to supply a required amount of treated seawater to the cold seawater tank 3 for supplying water to the pipe 22.
Send through. Of course, since the amount of treated seawater required changes with time, for example, water intake and operation of the consolidation filter 1 are always performed, and the excess amount is the washing drainage pipe 16 and the bypass pipe 1.
7. The treated seawater discharge pipe 38 may be discharged to the outside. The surplus treated seawater may be discharged, for example, when the temperature of the treated seawater in the treated seawater tank 2 rises too much.

The treated seawater stored in the cold seawater tank 3 is timely treated by the treated seawater circulation pump 26, and the treated seawater circulation outlet pipe 2 is provided.
7 to the cooling unit 4, cooled by the air-cooled condenser 5, and cooled by the cooling unit 4 and the circulation pipe 3.
Return to the cold seawater tank 3 again via 4. By this operation, the seawater temperature in the cold seawater tank 3 is controlled so as to be maintained at, for example, 2 ° C.

If necessary, the cold seawater supply pump 28 is driven to send the cold seawater to the second ultraviolet ray sterilizer 7 through the cold seawater supply pipe 29, and sterilize with ultraviolet rays to cool the treated seawater drainage section 8. It is supplied to the outside through a discharge pipe 37. Of course, in the cold seawater tank 3, the required amount of treated seawater changes with time, so the surplus amount may be discharged to the outside through the cold seawater discharge pipe 39.

Further, when the internal pressure of the compaction filtration device 1 rises, it is possible that the internal filter medium remains in the pressurized state, and therefore backwashing is performed. It is usually sufficient to backwash with seawater, so the backwash pump 18
Is driven to feed the treated seawater to the consolidation filter 1 through the backwash pipe 19, and the seawater pressurized from the lower portion is consolidated.
Into the housing. For stronger cleaning, the backwashing blower 12 is driven together with the backwashing pump 18, and air is also sent through the backwashing air pipe 13 so as to bubbling water with air. Supply.

[0024]

[Experimental results] Treated seawater taken by the inventors of the present invention from general seawater in the Ishinomaki fishing port in Ishinomaki City, Miyagi Prefecture and sterilized by using the raw water and the sterilized seawater production apparatus according to the present invention described above. About cold seawater, March 1, 2002
Miyagi Public Health Association (Water Supply Law No. 2)
When the property inspection was performed by Article 0 Designated Inspection Body: Designated No. 3), the test results shown in FIG. 2 were obtained. This result indicates that the treated seawater and cold seawater sterilized using the sterilized seawater production apparatus according to the present invention are seawater of a quality equal to or higher than tap water,
This indicates that the seawater is cold seawater and that it has sufficient properties to be sold to the outside as treated seawater or treated cold seawater.

[0025]

Since the sterilized seawater production apparatus according to the present invention is as described above, it not only kills the microorganisms contained in the seawater, but also produces seawater having a quality higher than that of tap water and cold seawater. It has the effect that it can be generated.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an apparatus for producing sterilized cold seawater according to the present invention.

FIG. 2 is a diagram showing property inspection results of raw water taken by the inventors of the present application and its treated seawater and cold seawater.

[Explanation of symbols]

1 Consolidation filtration device 2 treated seawater tank 3 Cold seawater tank 4 Chilling unit 5 Air-cooled condenser 6 First UV Sterilizer 7 Second ultraviolet sterilizer 8 Treated seawater drainage unit 10 Seawater intake piping 11 Filtration pump 12 Backwash blower 13 Air pipe for backwash 14 Treated seawater discharge piping 15, 17 bypass piping 16 Cleaning drainage pipe 18 Backwash pump 19 Backwash piping 20 Treated seawater supply pump 21 Treated seawater supply piping 22 Water supply piping 23 Water absorption pump 24 level sensor 25 temperature sensor 26 Treated seawater circulation pump 27 Treated seawater circulation outlet piping 28 Cold seawater supply pump 29 Cold seawater supply piping 30 level sensor 31 Temperature sensor 33 Automatic start / stop pressure tank 34, 35 Circulation piping 36 Pipe for discharging treated seawater 37 Pipes for discharging cold seawater 38, 39 Treated seawater discharge pipe

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) B01D 29/38 520A 540

Claims (3)

[Claims] 1. A compaction filtering device for filtering the taken seawater by passing it through a filter medium while pressurizing it, a treated seawater tank for inflowing the seawater filtered by the compaction filtering device, and a cooling device for inflowing the seawater from the treated seawater tank. A seawater tank, a cooling device that cools the seawater extracted from the cold seawater tank, a circulation system that circulates seawater between the cooling device and the cold seawater tank, and a first device provided on the outlet side of the treated seawater tank. 1 ultraviolet sterilizer, a second ultraviolet sterilizer provided on the outlet side of the cold seawater tank, and a drainage system that discharges seawater from each of the first ultraviolet sterilizer and the second ultraviolet sterilizer An apparatus for producing sterilized seawater, which is characterized in that 2. The apparatus for producing sterilized seawater according to claim 1, wherein a backwash system is provided between the treated seawater tank and the compaction filtration device, and the compaction filtration device is washed with seawater pressure-fed from the treated seawater tank. An apparatus for producing sterilized seawater that is capable of being made possible. 3. The apparatus for producing sterilized seawater according to claim 2, wherein the compaction filtration device is provided with an air backwash system, and the compaction filtration device is fed under pressure from the air backwash system and the treated seawater tank. An apparatus for producing sterilized seawater, characterized in that it can be washed with the desired seawater.