JP3801486B2 - Disinfecting seawater supply method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disinfecting seawater supply method and apparatus applied to a seafood market or the like attached to a fishing port, and more particularly, to a disinfecting seawater supply method and apparatus capable of supplying filtered and disinfected seawater.
[0002]
[Prior art]
In the marine products market attached to the fishing port (hereinafter referred to as the “production market”), seawater is used to clean marine seafood, cargo handling areas that handle marine seafood, docks, fish boxes, etc. There are many cases. This is mainly due to convenience and economic reasons due to the location conditions of the production market. That is, from the viewpoint of convenience, it is because the sea is close and seawater can be easily taken. From an economic point of view, when tap water is used as cleaning water for marine seafood, cargo handling areas, gills, fish boxes, etc., tap water is expensive. There is also a reason that the freshness of fishery products decreases when tap water is used.
[0003]
On the other hand, in the production area market, since seawater is used as washing water, there is a problem in hygiene management. For example, the number of patients with food poisoning due to Vibrio parahaemolyticus originated from marine products has risen to the thousands of people every year, and there is a need to improve the level of hygiene management. In advanced fisheries countries such as Europe and the United States, HACCP has already been stipulated, and for this reason, there is an urgent need to improve the level of sanitation management in Japan.
[0004]
Therefore, in order to obtain sanitary seawater, that is, seawater that is not contaminated with Vibrio parahaemolyticus, there is a method of taking water from offshore rather than in a fishing port. However, this method has hardly been introduced in reality. This is because (1) the management of the fishery cooperative, which is the management body of the production area market, is difficult and it is difficult to make new investments. (2) In many production areas, it is a human resource that manages machinery and equipment such as offshore water intake equipment. This is due to the fact that it is scarce and (3) offshore water intake requires enormous installation costs.
[0005]
Another method for obtaining sanitary seawater is to disinfect seawater taken from within the fishing port. As an example, a method of chlorinating or ozone-treating seawater taken from within a fishing port is taken.
Specifically, in chlorination, a method of adding liquid sodium hypochlorite or dissolving solid chlorine (salach powder) to the taken seawater is used. Although this method has been practiced for a long time, it is known that trihalomethane, a harmful substance, is produced as a by-product in the presence of organic components. The chlorine agent itself is highly toxic to fish and has a great influence on seaweeds such as laver. For this reason, it cannot be said that it is an appropriate processing method in the production center market where the chlorinated seawater returns directly to the sea.
Ozone treatment is known to produce carcinogenic bromic acid as a by-product because high concentrations of bromine ions are present in seawater. Bromic acid can be easily removed by activated carbon treatment, but when activated carbon is used as a filter medium, microorganisms such as bacteria are generated in the activated carbon layer, and the original purpose of “sterilization and disinfection” cannot be achieved. . In addition, the remaining ozone component is highly toxic to fish, and, like chlorination, it is difficult to say that it is an appropriate treatment method in the production market.
[0006]
Moreover, when using seawater as washing water, the seawater without turbidity is required. For this reason, for example, the method of filtering through the seawater taken in the filter using sand as a filter medium is taken. In this case, there are the following disadvantages. (1) The particle diameter of the filter medium varies, and the thickness of the effective filter layer that affects the filtration effect is the smallest part with the smallest particle diameter. For this reason, there is a limit in improving the filtration capacity. (2) Due to the characteristics of the effective filter layer, when the load of turbidity is high, the filter is clogged even if the amount of filtration treatment is very small. (3) The pump head and capacity required for the filtration treatment are defined by the flow resistance of the effective filter layer. For this reason, the processing pump required for the filter using sand as a filter medium is required to have a large high lift. (4) The specific gravity of sand as a filter medium is 2.5 or more. Moreover, since the filtration water pressure tends to be high, the container of the filter is often made of a steel plate. As a result, the total weight of the filter including the filter medium and the container becomes very heavy, which requires a lot of manpower to handle and causes a high cost.
[0007]
In addition, even in the production markets where these facilities are installed, seawater organisms (for example, “barnacles, oyster shells”, etc.) adhere to the inner surface of intake pipes that take in seawater. Therefore, it is often necessary to renew or replace the intake pipe. This is a big problem from the viewpoint of cost burden, and is a big problem from the viewpoint of maintaining the seawater disinfection function used in the production area market.
[0008]
[Problems to be solved by the invention]
This invention is made | formed in view of said point, and intends to provide the disinfection seawater supply method and its apparatus which can filter and disinfect and supply seawater.
[0009]
[Means for Solving the Problems]
  The disinfecting seawater supply method according to the present invention includes a step of taking seawater, a step of filtering the taken-up seawater through a filter medium, and a step of disinfecting the taken-up seawater with ultraviolet rays at least after or before the filtration. And supplying sterilized seawater that has been filtered and sterilizedIn the maintenance, without performing the step of filtering and the step of disinfecting with ultraviolet light, a bactericidal agent is added in the vicinity of the seawater intake used in the step of taking the seawater, and the seawater intake is opened. A sterilization step of taking sterilized seawater through, washing the filter medium with the sterilized seawater taken, and passing the sterilized seawater taken into the seawater passage during the filtration and disinfection At least one of passing water and sterilizing the inside of the water flow path, ending the sterilization process at the end of maintenance, taking the seawater, filtering, and disinfecting with ultraviolet light And the sterilized seawater remaining in the water passage is washed away by passing the filtered and disinfected seawater through the water passage.Is.
  Further, the disinfecting seawater supply device according to the present invention includes a pipe means for taking in and passing seawater, a filtering means provided in the middle of the pipe means for filtering the taken-up seawater with a filter medium, and the pipe line Ultraviolet irradiation means provided in the middle of the means for disinfecting the taken-up seawater with ultraviolet rays at least one after or before the filtration;A disinfecting seawater supply device comprising a disinfectant addition means for adding a disinfectant in the vicinity of the seawater intake port of the conduit means, which takes in seawater through the conduit means during normal operation. Then, filtering by the filtering means and disinfection by the ultraviolet irradiation means, supplying filtered and disinfected seawater, and at the time of maintenance, adding a disinfectant near the seawater intake by the disinfectant adding means Sterilized seawater is taken through the seawater intake, the filter medium is washed with the sterilized seawater taken, and the sterilized seawater thus taken is passed through the water passage of the conduit means. At least one of sterilizing the inside of the water flow path is performed, and at the end of the maintenance, the addition of the sterilizing agent by the sterilizing agent adding unit is ended, and seawater is taken in through the conduit unit. Perform disinfection by filtration and the ultraviolet light irradiation means by serial filtration means, washing out the sterilized seawater remaining in the water passage path by filtration and disinfected seawater it is passed through the water flow pathIt is characterized by this.
  According to the disinfecting seawater supply method and apparatus, seawater is taken, the seawater taken is filtered with a filter medium, and the filtered seawater is disinfected with ultraviolet rays. Therefore, the filtered and disinfected seawater is compared with chlorine disinfection. Can be supplied in a safe manner without secondary contamination. Therefore, when the present invention is applied as a means for supplying cleaning water in the seafood production area market, it is possible to effectively use inexpensive seawater by an environmentally friendly and safe technique.In addition, while having an ultraviolet irradiation step or means, it is provided with a bactericide addition step or means for adding a bactericide near the seawater intake, and at the time of maintenance, the bactericide addition step or means By sterilizing the filter medium or sterilizing in the water passage with the sterilizing agent by means, it is possible to perform reliable cleaning or sterilization in the water passage, and at the end of maintenance, Since the seawater is taken and disinfected by ultraviolet irradiation, the sterilized seawater remaining in the water passage is washed away by passing the filtered and disinfected seawater through the water passage. It is possible to provide a system that can ensure high safety when cleaning food such as seafood.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram showing an embodiment of a disinfecting seawater supply device according to the present invention. The disinfecting seawater supply device shown in FIG. 1 is provided, for example, in a production market that is attached to a fishing port.
[0011]
In FIG. 1, the disinfecting seawater supply device includes a water intake pipe 1, a water intake pipe 2, a filter 3, a UV disinfector 4, a water distribution pipe 5, a disinfectant addition apparatus 6, and the like. . The intake pipe 1 takes seawater W from the seawater intake 1a. The water intake pipe 2 includes a water intake pipe 2a, a dust remover F, a dust removal water pipe 2b, a water intake treatment pump P1, a water supply pipe 2c, and the like. In the intake pipe 2, the intake water treatment pump P <b> 1 is driven to cause the intake pipe 1 to take in the seawater W, and the intake seawater W <b> 1 is supplied to the intake pipe 2 a, the dust remover F, the dust removal water pipe 2 b, and the water supply It supplies to the filter 3 through the piping 2c for work.
[0012]
The filter 3 includes a filter container 3a made of FRP, a filter medium layer C made of a predetermined filter medium, and the like. The filter 3 filters the intake seawater W1 through the filter medium layer C during normal operation in the filtration container 3a. The filtered seawater W2 filtered by the filter medium layer C is supplied to the filter 3 through the filtered water treatment pipe 3b to the ultraviolet disinfector 4. Drain pipes 3c and 3d each having a drain valve are provided at the bottom of the filtration container 3a and the filtered water treatment pipe 3b, respectively. The drain pipes 3c and 3d are used during the filter function recovery operation described later.
As an example of the filter medium layer C, it is preferable to use an appropriate floating filter medium. As the floatable filter medium, for example, a granular filter medium made of a synthetic resin having a specific gravity lower than 1 g / ml (for example, made of polystyrene foam) can be used. The particle size of this filter medium is larger than that of the sand filter medium. The filter medium layer C uses a large number of floatable filter media having a constant particle size, and filters the intake water seawater W1 supplied into the filtration container 3a with the thickness of the effective filter layer affecting the filtration effect, that is, the thickness of the filter medium layer C. It is set so that the maximum filtration capacity can be demonstrated with respect to the flow rate. When such a floatable filter medium is used, a stirring member (not shown) is provided in the filtration container 3a in order to wash the filter medium.
[0013]
The ultraviolet sterilizer 4 is disposed at the subsequent stage of the filter 3 and sterilizes the filtered seawater W2 and the like supplied from the filter 3 with ultraviolet rays. The ultraviolet sterilizer 4 includes a water pipe 4a for passing the filtered seawater W2 supplied from the filter 3, and an ultraviolet lamp (not shown) for irradiating ultraviolet light provided in the water pipe 4a. . In the ultraviolet disinfector 4, the seawater W2 supplied into the water pipe 4a is irradiated with ultraviolet rays by an ultraviolet lamp to disinfect the seawater W2, and the disinfected seawater W3 is cushioned in the distribution pipe 5 through the tank water supply pipe 4b. Supply to tank T. Since the ultraviolet disinfector 4 is arranged at the subsequent stage of the filter 3, it can uniformly irradiate the non-turbid seawater W2 supplied from the filter 3 with ultraviolet rays, thereby improving the disinfection effect by the ultraviolet irradiation. it can.
[0014]
The water distribution pipe 5 includes a cushion tank T, a water distribution pipe 5a, a water distribution processing pump P2, and the like. The cushion tank T temporarily stores the sterilized filtered water seawater W3 supplied from the ultraviolet disinfector 4. The water distribution pipe 5a is provided with a water distribution processing pump P2, a plurality of water supply taps (three water supply taps in the illustrated example) V1 to V3, and the like. The water distribution pipe 5a is configured to form a closed loop return path from the cushion tank T to the cushion tank T through the water distribution processing pump P2 and the water supply taps V1 to V3. The water taps V1 to V3 are appropriately provided at the necessary cleaning work locations in the market, and are used to supply cleaning water to clean marine seafood, cargo handling areas, gills, fish boxes, etc. The
[0015]
The sterilizing agent adding device 6 disinfects and sterilizes the intake pipe 1, the intake seawater W1 taken by the intake pipe 1, the intake pipe 2 and the water distribution pipe 5 through which the intake seawater W1 passes during maintenance. Is added in the vicinity of the seawater intake 1 a of the intake pipe 1. At the time of maintenance, the normal operation, that is, the supply of cleaning water through the water supply taps V1 to V3 is stopped, and the filter medium in the filter medium layer C is cleaned or the entire pipeline is sterilized. The disinfectant addition device 6 has a storage container 6a that stores hydrogen peroxide as a disinfectant, and discharges the hydrogen peroxide in the container 6a to the vicinity of the seawater intake 1a through the pipe 6b by driving the pump P3. To do. As will be described later, the bactericidal agent-added seawater W4 to which hydrogen peroxide has been added is taken into the intake pipe 2 from the intake port 1a and used for cleaning the filter medium or sterilizing the entire pipe.
[0016]
The disinfecting seawater supply apparatus shown in the present embodiment includes a control panel (not shown). This control panel includes a program for managing and operating the entire apparatus, a memory storing various data (setting data), an MPU, and the like. The control part etc. which become are stored. An operation mode changeover switch is electrically connected to the control unit. By operating this operation mode changeover switch, normal operation, filtration function recovery operation, and transition operation (transition from filtration function recovery operation to normal operation are performed. The operation mode can be switched to three types of operation modes. The control unit is configured to discharge water from the water intake treatment pump P1, the water distribution treatment pump P2, the pump P3, the drive motor (not shown) of the stirring member of the filter 3 and the drain pipes 3c and 3d according to the three operation modes. Valves and the like are appropriately driven and controlled. The normal operation is performed when seawater is used as cleaning water, but the filtration function recovery operation and the transition operation are performed using a time zone during which seawater is not used as cleaning water or holidays in the production area market.
[0017]
Next, the operation | movement operation | movement according to three types of operation modes of the disinfection seawater supply apparatus shown in a present Example is demonstrated with reference to FIG.
First, normal operation will be described. In the intake pipe 2, the seawater W is taken from the intake pipe 1 by driving the intake treatment pump P <b> 1. The intake seawater W1 taken by the intake pipe 1 is introduced into the filter 3 through the intake pipe 2a, the dust collector C, the intake treatment pump P1, the dust removal water pipe 2b, and the feed water pipe 2c. The At that time, a relatively coarse dust removal target material such as marine organisms contained in the intake seawater W1 is removed by the dust remover C. For this reason, the intake water seawater W1 containing a comparatively minute filtration object substance is supplied to the filter 3.
[0018]
In the filter 3, the intake seawater W <b> 1 introduced from the intake pipe 2 is filtered through the filter medium layer C from below in the filtration container 3 a. In this case, since the intake seawater W1 is passed through the filter medium layer C from the bottom to the top, a minute substance to be filtered adheres to the surface of the floatable filter medium. Since the particle size of the filter medium is made larger than that of the sand filter medium, the filtration resistance is smaller than that of the sand filter medium. For this reason, the intake seawater W1 introduced from the intake pipe 2 can be efficiently filtered. The intake seawater W1 passes through the filter medium layer C, and is made into filtered seawater W2 of clear water without turbidity. Then, the filtered seawater W2 is introduced into the water pipe 4a of the ultraviolet disinfector 4 through the filtered water treatment pipe 3b.
[0019]
In the ultraviolet disinfector 4, the filtered seawater W2 passing through the water pipe 4a is irradiated with ultraviolet rays by an ultraviolet lamp. The filtered seawater W2 is sterilized and sterilized by being irradiated with ultraviolet rays. The irradiation amount of the ultraviolet rays to the filtered seawater W2 is appropriately set according to the processing capacity of the apparatus. In this example, as an example, the irradiation amount of ultraviolet rays to the filtered seawater W2 is 10 mJ / cm.²It is said. The sterilized filtered seawater W3 sterilized and sterilized by the ultraviolet disinfector 4 is introduced into the cushion tank T of the water distribution pipe 5 through the tank water supply pipe 4b.
[0020]
In the water distribution pipe 5, the sterilized filtered seawater W3 is stored in the cushion tank T. Then, the water distribution treatment pump P2 is driven to supply the sterilized filtered seawater W3 from the cushion tank T to the water distribution pipe 5a. Thereby, if the faucets V1 to V3 are opened, the sterilized filtered seawater W3 can be used as cleaning water for marine seafood, cargo handling areas, gills, fish boxes, and the like.
[0021]
The sterilized filtered seawater W3 that is not used as cleaning water is returned to the cushion tank T through the water supply pipe 5a. In the cushion tank T, the sterilized filtered seawater W3 is stored. In this way, the sterilized filtered seawater W3 that is not used as cleaning water is returned to the cushion tank T. Therefore, by appropriately controlling the driving of the water intake treatment pump P1 and the water distribution treatment pump P2, the water intake amount of the intake seawater W1 And the flow rate of the distribution amount of the sterilized filtered seawater W3 can be easily adjusted. As an example, the water supply amount of the sterilized filtered seawater W3 to the cushion tank T is adjusted by appropriately controlling the operation time of the water intake treatment pump P1 or the water distribution treatment pump P2 according to the amount of washing water used. Flow control becomes possible.
[0022]
Next, the filtration function recovery operation will be described. When normal operation is continued for a long time, in the filter 3, the filter medium layer C is clogged by the adhering substances adhering to the surface of the floatable filter medium, so that the filtration function of the filter 3 is deteriorated. For this reason, for the purpose of recovering the filtration function of the filter 3, a filtration function recovery operation (that is, a filter medium cleaning process) is performed. In performing the filtration function recovery operation, all of the water taps V1 to V3 are opened, the water distribution processing pump P2 is driven, and the disinfected filtered seawater W3 remaining in the water distribution pipe 5 is opened. Discharge from V3. Thereafter, all of the water taps V1 to V3 are closed. Thereby, the bactericidal agent-added seawater W4 can be filled in the water pipeline 2 to the water distribution pipeline 5 and the water intake pipeline 2 to the water distribution pipeline 5 can be sterilized and sterilized.
[0023]
In the sterilizing agent adding device 6, by driving the pump P3, an appropriate amount of hydrogen peroxide from the sterilizing agent storage container 6a is added into the intake pipe 1 from the vicinity of the seawater intake 1a through the pipe 6b. The amount of hydrogen peroxide water added is appropriately set according to the processing capacity of the apparatus. As an example, the amount of hydrogen peroxide solution added may be about 2 to 50 ppm, and preferably 10 to 20 ppm. At the same time, the pump P1 is driven to take in the seawater to which hydrogen peroxide has been added into the intake pipe 2 from the seawater intake port 1a, that is, the bactericidal agent-added seawater W4.
[0024]
The bactericidal agent-added seawater W4 is introduced into the filter 3 through the intake pipe 2a, the dust collector C, the intake water treatment pump P1, the dust removal water pipe 2b, and the water supply pipe 2c. At that time, the disinfectant-added seawater W4 disinfects and disinfects the inner surfaces of the water intake pipe 2a, the dust remover C, the water intake treatment pump P1, the dust water removal pipe 2b, and the water supply pipe 2c. Further, a relatively coarse dust removal target substance such as marine organisms contained in the bactericide-added seawater W4 is removed by the dust remover F.
[0025]
In the filter 3, the bactericide-added seawater W <b> 4 introduced from the intake pipe 2 is stirred by the stirring member in the filtration container 3 a. As a result, the floatable filter medium is stirred together with the bactericidal agent-added seawater W4, so that the filter medium collides with this stirring action, and the adhered substances are separated from the filter medium surface. At this time, since the filter medium also hits the inner surface of the filtration container 3a, the adhering substances adhering to the inner surface of the filtration container 3a are also peeled off from the inner surface. Thereby, not only the filter medium but also the inner surface of the container can be cleaned. The adhering substances peeled off from the filter medium surface and the container inner surface float in the bactericidal agent-added seawater W4. Thus, the adhering substance is peeled off from the filter medium surface and the container inner surface, so that the filtration function of the filter 3 can be recovered.
Of the adhering substances floating in the bactericidal agent-added seawater W4, relatively heavy adhering substances accumulate on the bottom of the filtration container 3a, and relatively light adhering substances continue to float in the bactericidal agent-added seawater W4. Therefore, the drainage valve of the drainage pipe 3c is opened, and the deposited adhering material deposited on the bottom together with the seawater is discharged from the drainage pipe 3c to the outside. At the same time, the drain valve of the drain pipe 3d is opened, and the floating adhering substance floating on the upper part of the filtration container 3a is discharged from the drain pipe 3d to the outside together with seawater. As a result, the bactericide-added seawater W4 with a small amount of deposited adhering substances and floating adhering substances can be supplied into the water pipe 4a of the external line disinfector 4 through the filtered water treatment pipe 3b.
[0026]
In the ultraviolet disinfector 4, the bactericidal agent-added seawater W4 passes through the water passage 4a, so that the water passage 4a can be sterilized and sterilized with the bactericidal agent-added seawater W4. The bactericidal agent-added seawater W4 in the water pipe 4a is introduced into the cushion tank T of the water distribution pipe 5 through the tank water supply pipe 4b.
[0027]
In the water distribution pipe 5, the cushion tank T stores the bactericidal agent-added seawater W4. By driving the water distribution treatment pump P2, the bactericidal agent-added seawater W4 is supplied from the cushion tank T to the water supply pipe 5a and returned to the cushion tank T. Thereby, since the intake pipe 1 to the distribution pipe 5 is filled with the bactericidal agent-added seawater W4, the intake pipe 1 to the distribution pipe 5 can be sterilized and sterilized by the bactericidal agent-added seawater W4.
During the filtration function recovery operation described above, hydrogen peroxide is added in the vicinity of the seawater intake 1a of the intake pipe 1 so that marine organisms such as barnacles and oyster shells are formed on the inner surface of the intake pipe 1 by the sterilization effect. Adhesion can be prevented, and the intake capacity of the intake seawater W1 can be secured over a long period of time.
[0028]
Next, the transition operation will be described.
When the filtration function recovery operation is performed, since the bactericidal agent-added seawater W4 remains in the intake pipe 1 to the distribution pipe 5, it is necessary to wash out the bactericidal agent-added seawater W4 before performing normal operation. . Therefore, the transition operation is performed for the purpose of washing away the bactericidal agent-added seawater W4. In performing the transfer operation, all of the water taps V1 to V3 are opened. Thus, as the intake seawater W1 is supplied to the intake pipe 2, the sterilizer-added seawater W4 remaining in the intake pipe 1 to the distribution pipe 5 in the above-described filtration function recovery operation is supplied to the water faucets V1 to V3. Can be washed away from. Moreover, after discharging the bactericidal agent-added seawater W4 from the water taps V1 to V3, the distribution pipe 5 can be filled with the sterilized filtered seawater W3 by closing all the water taps V1 to V3.
In the transition operation, the operations of the water intake pipe 1 to the ultraviolet disinfector 4 are the same as those in the normal operation described above, and thus the description of the operation is omitted.
[0029]
In the water distribution pipe 5, the cushion tank T stores the sterilized filtered seawater W3. Then, when the water distribution processing pump P2 is driven, the bactericidal agent-added seawater W4 remaining in the water distribution pipe 5 is washed away from the open water taps V1 to V3. Then, the water faucets V1 to V3 are closed and the water distribution treatment pump P2 is continuously driven, whereby the sterilized filtered seawater W3 is supplied from the cushion tank T to the water supply pipe 5a and returned to the cushion tank T. Thereby, since the water distribution pipe line 5 is filled with the sterilized filtered seawater W3, it is possible to perform normal operation.
[0030]
FIG. 2 shows a disinfecting seawater supply apparatus A that performs disinfection and sterilization treatment with a disinfectant (hydrogen peroxide solution) described in the embodiment of the present invention, and a conventional disinfecting seawater supply that does not perform disinfection and disinfection processing with a disinfectant. The actual measurement data which performed the comparison experiment about transition of the Vibrio parahaemolyticus count with the apparatus B are shown. In this experiment, raw seawater, filtered seawater, and ultraviolet-treated seawater (in the illustrated example, UV-treated water) were collected from devices A and B, and the number of Vibrio parahaemolyticus was analyzed. In the figure, the operating dates of the devices A and B are shown on the horizontal axis, and the number of Vibrio parahaemolyticus obtained according to the operating dates is shown on the vertical axis. In addition, the Vibrio parahaemolyticus count about ultraviolet-treated seawater was only detected on a specific day (2001/10/8) in the apparatus A (using a one-year-used lamp) of this example shown on the right side of the figure. And on other days it was zero. The reason why the Vibrio parahaemolyticus count was detected on the specific day is based on the fact that seawater was significantly contaminated by the influence of the typhoon.
[0031]
As is clear from the figure, in the apparatus A of the present example, the maximum value a1 of Vibrio parahaemolyticus in the raw seawater is smaller than the maximum value b1 of Vibrio parahaemolyticus in the raw seawater in the prior art apparatus B. The minimum value a2 of the Vibrio parahaemolyticus count of seawater is also smaller than the minimum value b2 of the Vibrio parahaemolyticus count of raw seawater in the apparatus B of the prior art. Moreover, the maximum value a11 of the Vibrio parahaemolyticus count of filtration seawater is smaller than the maximum value b11 of the Vibrio parahaemolyticus bacteria of the filtration seawater in the prior art apparatus B, and the minimum value a12 of Vibrio parahaemolyticus bacteria of the filtration seawater is also conventional. It is smaller than the minimum value b12 of Vibrio parahaemolyticus in the filtered seawater in the technical apparatus B. Thus, the Vibrio parahaemolyticus count of the raw seawater and filtered seawater in the apparatus A of the present embodiment is smaller than the Vibrio parahaemolyticus count of the raw seawater and filtered seawater in the prior art apparatus B. It can be seen that the number of Vibrio parahaemolyticus decreases when water is used to disinfect and sterilize the intake seawater and the passage of the intake seawater. Therefore, by adding the hydrogen peroxide solution to the seawater, the seawater can be supplied as sanitary washing water.
[0032]
In the apparatus A of the present embodiment, a new ultraviolet lamp was used for the experiment, but the actual measurement data corresponding to the Vibrio parahaemolyticus count when the ultraviolet lamp used for one year was used in the apparatus A of the present embodiment was the same. Shown on the right side of the figure. In this case, as shown in the figure, the number of Vibrio parahaemolyticus in the raw seawater and filtered seawater tends to increase as the operating days of the apparatus A become longer. Therefore, a new ultraviolet lamp may be used to supply seawater as sanitary washing water.
[0033]
In the disinfecting seawater supply apparatus shown in the present embodiment, the floating filter medium is used as the filter medium of the filter medium layer C in the filter 3, but the present invention is not limited to this, and a sand filter medium may be used as the filter medium of the filter medium layer C. . In this case, for example, a seawater introduction pipe having a water outlet at the upper part and the lower part is provided inside the filtration container 3a, and the upper and lower water outlets of the seawater introduction pipe are respectively for opening and closing the water outlet. Provide a control valve. Then, during normal operation and transition operation, the control valve is controlled to close the upper water outlet of the seawater introduction pipe and open the lower water outlet so that the intake seawater W1 supplied from the intake pipe 2 is sand-filtered. Filter through the layers from bottom to top. In addition, during the filtration function recovery operation, the control valve is controlled to open the upper water outlet of the seawater introduction pipe and close the lower water outlet to disinfect the sterilizer-added seawater W4 supplied from the intake pipe 2 with the sand filter medium. Filter through the layers from top to bottom. In this way, by performing so-called “backwashing” in which the bactericidal agent-added seawater W4 is passed through the sand filter material layer from the top to the bottom, the bactericidal agent-added seawater W4 is the flow direction of the intake seawater W1 in the filtration container 3a. The water is stirred in the reverse direction. Since the sand filter medium can be stirred by the stirring action of the bactericide-added seawater W4 by this backwash, the adhering substances adhering to the surface of the sand filter medium are peeled off from the surface of the sand filter medium and are also attached to the inner surface of the filtration container 3a. Adhering substances are also peeled off from the inner surface. Thereby, not only the sand filter medium but also the inner surface of the filtration container 3a can be washed. Therefore, when a sand filter medium is used, the filtration function of the filter 3 can be recovered by backwashing the bactericidal agent-added seawater W4. Of course, the backwashing and the stirring member may be used in combination to stir the bactericidal agent-added seawater W4.
[0034]
Moreover, although the ultraviolet disinfector 4 was arrange | positioned in the back | latter stage of the filter 3, you may arrange | position the ultraviolet disinfector 4 of the same structure in the front | former stage of the filter 3, ie, the water intake pipe line 2, and the filter 3, You may arrange | position to both a front | former stage and a back | latter stage.
[0035]
Moreover, in the said Example, a filter medium washing | cleaning process and a pipe line sterilization process are performed simultaneously by supplying the sterilizer addition seawater W4 from the water pipe line 2 to the ultraviolet-ray disinfector 4 through the filter 3 at the time of a maintenance. However, the present invention is not limited to this, and only the sterilization treatment of the intake pipe 2, the ultraviolet disinfector 4, the water distribution pipe 5, etc. is performed by bypassing the filter 3 and flowing the sterilizing-added seawater W4. May be.
[0036]
As described above, the disinfecting seawater supply device shown in the present embodiment filters the intake seawater W1, disinfects the filtered seawater W2, and distributes the water, so that the seawater can be supplied as sanitary washing water.
[0037]
Moreover, since hydrogen peroxide water is used as a disinfectant, the intake seawater W1 can be sterilized and sterilized without generating harmful by-products like chlorination and ozone treatment. This makes it possible to disinfect and sterilize the intake seawater W1 while minimizing the possibility of secondary contamination. Moreover, seawater disinfection function in the production market can be maintained at a high level by using hydrogen peroxide water, which is less toxic to fish than chlorinating agents and ozone. In addition, marine organisms such as barnacles and oyster shells can be prevented from adhering to the inner surface of the intake pipe 1, and the intake capacity of the intake seawater W1 by the intake pipe 1 can be ensured for a long period of time.
[0038]
In addition, as the filter medium, a floatation filter medium made of a synthetic resin having a particle size larger than that of the sand filter medium and having a specific gravity lower than 1 g / ml is used, so that the filtration resistance is smaller than that of the sand filter medium. For this reason, since the pump head required for obtaining the same filtration flow rate as when sand filter media is used is reduced, a small and low cost pump for water intake treatment P1 can be used.
[0039]
Moreover, since filtration resistance is small, the filtration rate (filtrated water amount per unit filtration area) is large. That is, the diameter of the filtration container 3a for obtaining the same amount of filtered water as when sand filter media is used is small. Further, since the filtration water pressure can be small, the material of the filtration container 3a can be made of FRP. This has the advantage that the filtration container 3a is excellent in corrosion resistance when viewed from the application of the filter 3 that uses seawater as washing water. In addition, since the filter medium and the filter container 3a forming the filter medium layer C are both industrial products that can be manufactured from light materials, the overall weight of the filter 3 is very light. For this reason, there is an advantage that the filter 3 itself can be easily handled and is inexpensive.
[0040]
Also, normal operation, filtration function recovery operation, and transition operation can be set by operating the operation mode changeover switch, so that the management and operation of the equipment is easy even without a maintenance management engineer, and the conditions in the production market Disinfecting seawater supply device suitable for
[0041]
【The invention's effect】
As described above, according to the disinfecting seawater supply method and apparatus according to the present embodiment, seawater is taken, the taken seawater is filtered with a filter medium, and the filtered seawater is disinfected with ultraviolet rays. It has an excellent effect of being able to supply disinfected seawater.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a disinfecting seawater supply device according to the present invention.
FIG. 2 is a graph illustrating an experimental result of a change in the number of Vibrio parahaemolyticus associated with the number of working days in the disinfecting seawater supply device shown in FIG. 1 in comparison with a conventional device.
[Explanation of symbols]
1 Intake pipe
2 Intake pipeline
3 Filter
4 UV disinfector
5 Water distribution pipelines
6 Disinfectant addition equipment
F Dust remover
P1 Water treatment pump
P2 Water distribution treatment pump
P3 Disinfectant addition treatment pump
T cushion tank
C Filter media layer
V1-V3 water tap
W1 intake water
W2 filtered seawater
W3 Sanitized filtered seawater
W4 Disinfectant-added seawater

Claims (8)

A process of taking seawater;
A step of filtering the taken seawater through a filter medium;
A step of disinfecting the taken-up seawater with ultraviolet rays after at least one of the filtration and before the filtration, and supplying filtered and disinfected seawater .
At the time of maintenance, without performing the step of filtering and the step of disinfecting with ultraviolet rays, a bactericidal agent is added in the vicinity of the seawater intake used in the step of taking in the seawater, and the seawater intake is passed through the seawater intake. Execute sterilization process to take sterilized seawater,
Washing the filter medium with the sterilized seawater taken, and sterilizing the inside of the water passage by passing the sterilized seawater taken through the water passage of seawater during the filtration and disinfection. Do at least one of
At the end of the maintenance, the sterilization step is terminated, the step of taking the seawater, the step of filtering, the step of disinfecting with ultraviolet light is performed, and the filtered and disinfected seawater is passed through the water passage. The disinfecting seawater supply method characterized by wash | cleaning the said sterilized seawater which remains in the said water flow path by doing .   The disinfected seawater supply method according to claim 1, further comprising a step of supplying the filtered and disinfected seawater as cleaning water for seafood or the like through a pipe disposed in the seafood market. The disinfecting seawater supply method according to claim 1 or 2 , wherein a floatable filter medium having a specific gravity lighter than 1 g / ml is used as the filter medium. The disinfecting seawater supply method according to any one of claims 1 to 3 , wherein hydrogen peroxide water is used as the disinfectant. Conduit means for taking and passing seawater;
A filtering means provided in the middle of the conduit means for filtering the taken-up seawater with a filter medium;
An ultraviolet irradiation means provided in the middle of the pipe means for disinfecting the taken-up seawater with ultraviolet rays at least one after or before the filtration ;
Bactericidal agent adding means for adding a bactericidal agent in the vicinity of the seawater intake of the pipe means;
A disinfecting seawater supply device comprising:
During normal operation, take seawater through the conduit means, perform filtration by the filtration means and disinfection by the ultraviolet irradiation means, supply filtered and disinfected seawater,
At the time of maintenance, the sterilizing agent is added near the seawater intake by the sterilizing agent addition means, sterilized seawater is taken in through the seawater intake, and the filter medium is washed with the sterilized seawater taken up. And at least one of passing the sterilized seawater that has been taken into the water passage of the conduit means to sterilize the water passage,
At the end of maintenance, the addition of the sterilizing agent by the sterilizing agent adding unit is terminated, seawater is taken in through the conduit unit, the filtering unit is filtered and the ultraviolet irradiation unit is sterilized, and the filtering and sterilizing unit is performed. Disinfecting seawater supply device, wherein the sterilized seawater remaining in the water passage is washed away by passing the already-sealed water through the water passage .   6. The disinfected seawater supply device according to claim 5, further comprising piping means for supplying the filtered and sterilized seawater as cleaning water for marine products and the like through a pipe disposed in the seafood market. The disinfecting seawater supply device according to claim 5 or 6 , wherein a floatable filter medium having a specific gravity lighter than 1 g / ml is used as the filter medium. The disinfecting seawater supply device according to any one of claims 5 to 7 , wherein hydrogen peroxide is used as the disinfectant.

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