WO2006093183A1

WO2006093183A1 - Process for producing water for growth of marine organism and production apparatus

Info

Publication number: WO2006093183A1
Application number: PCT/JP2006/303853
Authority: WO
Inventors: Masahiko Katayose; Hiroaki Kamino
Original assignee: Hoshizaki Denki Kabushiki Kaisha
Priority date: 2005-03-02
Filing date: 2006-03-01
Publication date: 2006-09-08
Also published as: JP2006238769A

Abstract

A system for producing water for growth of marine organisms, comprising the filtration step of filtering seawater; the electrolysis step of electrolyzing the filtered seawater to thereby obtain a sterile seawater having its available chlorine concentration reduced to ≤ 10 mg/L; and the available chlorine removing step of removing any available chlorine remaining in the seawater having been sterilized in the electrolysis step within a period of 1 hr.

Description

Specification

Method and apparatus for producing marine organism growing water

TECHNICAL FIELD OF THE INVENTION

[0001] The present invention cultivates marine fish such as tuna, hamachi, flounder and red sea bream, marine shells such as oysters and scallops, seaweeds such as seaweed, zooplankton and planktons such as phytoplankton. The present invention relates to a production method and a production apparatus for growing water used for the purpose. Review of conventional technology

[0002] In farms that cultivate marine organisms, it is important to create an environment suitable for nurturing, growing, and growing marine organisms. The water for cultivation is the most involved. For this reason, clean water that is clean and sufficiently sterilized and has almost no bacteria is required as the water for forming a good growth environment for marine organisms.

[0003] As means for sterilizing seawater used as water for nurturing marine organisms, generally, a method of irradiating seawater with ultraviolet rays, a method of heat-treating seawater, a method of filtering seawater, and various disinfections to seawater There is a method of adding an agent or a bactericide. These methods of disinfecting seawater are not suitable for practical use because they increase the cost of raising marine organisms. Some seawater generated by these sterilization methods cannot form a good breeding environment. The simplest method that requires no disinfectant or disinfectant to add large equipment is preferable for the growth of marine organisms! There is a possibility that residues may be generated in seawater.

[0004] In recent years, focusing on the sterilizing ability of electrolyzed water produced by electrolyzing seawater, a method of sterilizing seawater by electrolytic treatment or electrolyzed water having sterilizing ability produced by electrolysis has been In addition, a method for sterilization treatment has been proposed. These sterilization treatment methods are advantageous in terms of cost compared to the conventional sterilization treatment methods described above, and can generate residues that affect growth caused by disinfectants and disinfectants. There is no advantage. However, the electrolyzed water produced by seawater electrolysis and having sterilizing ability contains more effective chlorine than is consumed for the sterilization treatment of seawater, so it can be used as water for breeding marine organisms. A significant amount of available chlorine remains in the seawater. Nurturing like this Seawater for irrigation has a disinfecting ability even if the degree is low, and therefore it adversely affects the growth of microalgae and adversely affects the growth of microalgae. For example, it may adversely affect the growth of microalgae, which are important food for culturing marine invertebrate larvae. Therefore, it is important that the seawater for breeding that forms a good environment for marine organisms does not adversely affect the growth of microalgae and the like.

[0005] In order to cope with this problem, the inventors disclosed in Japanese Patent Laid-Open No. 2003-144001, the seawater for growth which was sterilized by electrolytically generated water of a dilute aqueous solution of organic salt and neutralized its sterilizing ability. It has been proposed that it is suitable for creating a favorable growth environment for the growth of marine organisms, which does not adversely affect the growth of microalgae.

[0006] In order to neutralize the sterilizing ability of seawater sterilized by electrolysis, the inventors can use effective chlorine remaining in the sterilized seawater. It was confirmed that it is important to remove the available chlorine within a predetermined time after sterilizing the sea water in order to reduce it as much as possible and to remove the available chlorine remaining in the sea water accurately. In the above-described effective chlorine removal treatment, the inventors have produced organic halogen compounds in the sterilized seawater due to residual effective chlorine, and the amount of organic halogen compounds produced increases with time. It has been confirmed that organic halogen compounds such as trihalomethane tend to increase and that the amount of their production must be kept as low as possible because they are compounds that have been shown to be carcinogenic.

Summary of the Invention

[0007] Based on the above findings, the main object of the present invention is to provide marine organism growth water that can sufficiently suppress the formation of organic halogen compounds resulting from effective chlorine remaining in the growth water. To provide a manufacturing method and a manufacturing apparatus.

[0008] According to the present invention, the object is to provide a filtration process for filtering seawater, and an electrolyzer for producing seawater sterilized to an effective chlorine concentration of 10 mg / L or less by electrolyzing the filtered seawater. This is achieved by a method for producing water for breeding marine organisms, comprising a solution treatment step and an effective chlorine removal treatment step for removing effective chlorine remaining in seawater sterilized in the electrolytic treatment step within one hour. The

[0009] According to one embodiment of the present invention, a filtration process for filtering seawater, and an inorganic salt An electrolysis process in which a dilute aqueous solution is electrolyzed to produce sterilization water, and the sterilization water produced in the electrolysis process is mixed with filtered seawater to remove an effective chlorine concentration of 10 mg / L or less. The sterilized seawater production process that produces the sterilized seawater, and the effective chlorine remaining in the sterilized seawater produced in the sterilized seawater production process is removed within 1 hour after the production of the sterilized seawater. Apply the seawater production method for marine organisms, which consists of the removal treatment process.

[0010] Further, in order to carry out the above-described method for producing water for cultivating marine organisms, a filtration device that filters seawater, and an electrolytic device that generates sterilized seawater by electrolyzing the filtered seawater. And an effective chlorine removal treatment device that removes effective chlorine remaining in the sterilized seawater generated by the electrolyzer, and the sterilized seawater having an effective chlorine concentration of 10 mg / L or less by the electrolyzer. A device for producing water for breeding marine organisms is adopted in which effective chlorine remaining in the generated sterilized seawater is removed by the removal treatment device within 1 hour after the generation of the sterilized seawater. Is desirable.

Furthermore, in the practice of the present invention, a filtration device for filtering seawater, an electrolytic device for electrolyzing a dilute aqueous solution of an inorganic salt to produce sterilizing water, and sterilizing water produced by the electrolytic device Sterilized seawater production means that mixes with the filtered seawater to produce sterilized seawater, and removal of effective chlorine that removes the effective chlorine remaining in the sterilized seawater produced by the sterilized seawater production means A sterilization seawater generator with an effective chlorine concentration of 10 mg / L or less, and the effective chlorine concentration remaining in the generated sterilization seawater after the generation of the sterilization seawater. You may apply seawater production equipment for the growth of marine organisms that will be removed within one hour.

[0012] In the method and apparatus for producing water for marine organism growth according to the present invention described above, the content of trihalomethane in the organohalogen compound is extremely small in sterilized seawater with almost no bacteria. Thus, it is possible to obtain breeding seawater with negative mutagenesis-inducing performance. This breeding seawater is extremely excellent for the growth of marine organisms, and by using this breeding seawater, a favorable breeding environment for marine organisms can be formed. Moreover, since the seawater for growth has a low content of organic halogen compounds, the waste liquid after use does not contaminate seawater such as the ocean to be drained. This breeding seawater is It is extremely useful as water for marine life.

Brief Description of Drawings

FIG. 1 is a schematic configuration diagram schematically showing a first manufacturing apparatus which is an embodiment of a manufacturing apparatus according to the present invention;

FIG. 2 is a schematic configuration diagram schematically showing a second manufacturing apparatus which is another embodiment of the manufacturing apparatus according to the present invention;

FIG. 3 is a schematic configuration diagram schematically showing a third manufacturing apparatus which is another embodiment of the manufacturing apparatus according to the present invention;

FIG. 4 is a schematic configuration diagram schematically showing a fourth manufacturing apparatus which is another embodiment of the manufacturing apparatus according to the present invention;

FIG. 5 is a schematic configuration diagram schematically showing a negative pressure removal processing apparatus which is an example of a removal processing apparatus employed in the manufacturing apparatus according to the present invention;

FIG. 6 is a schematic configuration diagram schematically showing an air bubble ring type removal treatment apparatus which is another example of the removal treatment apparatus employed in the production apparatus according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0014] The present invention relates to a method and apparatus for producing water for breeding marine organisms. Fig. 1 and Fig. 2 show the first manufacturing device 10a and the second manufacturing device 10b that employ a diaphragm-type electrolyzer, and Figs. 3 and 4 adopt a diaphragm-type electrolyzer. The third manufacturing apparatus 20a and the fourth manufacturing apparatus 20b are shown.

[0015] The first manufacturing apparatus 10a obtains seawater (sterilized seawater) sterilized by non-membrane electrolysis using seawater as electrolyzed water, and removes effective chlorine remaining in the sterilized seawater. Is. The first production apparatus 10a includes a seawater storage tank 11 for storing seawater collected from ocean power, a filtration apparatus 12 for filtering seawater, a diaphragm-type electrolysis apparatus 13 for performing diaphragmless electrolysis using seawater as electrolyzed water, and And a removal treatment device 14 for removing effective chlorine remaining in electrolyzed water (sanitized seawater) produced by electrolysis in the electrolysis device 13. The storage tank 11 and the filtration device 12 are connected to each other through a first supply pipe 15a, and are interposed in the first supply pipe 15a, and are driven into the storage tank 11 by driving the supply pump 16a. The stored sea water is supplied to the filtration device 12. On the other hand, the filtration device 12 includes a second supply line 15b connected to the electrolyzer 13, a third supply line 15c connected to the removal processing device 14, and a reflux tube connected to the aquaculture tank B described later. Road 15d is provided. In addition, the electrolyzer 13 includes a fourth supply line 15e connected to the removal treatment apparatus 14, and the removal treatment apparatus 14 includes a fifth supply line 15f connected to the culture tank B. In an aqueous circuit composed of these pipes, a first switching valve 16b is interposed at a connecting portion between the first supply pipe 15a and the reflux pipe 15d, and the second supply pipe 15b and the third supply pipe are connected. A second switching valve 16c is interposed at the connecting portion of 15c. The aquaculture tank B is provided with a drain pipe b, and the reflux pipe 15d is connected to the drain pipe b. A third switching valve 16d is interposed at this connecting portion.

[0017] In the first manufacturing apparatus 10a having the water system circuit, by driving the supply pump 16a, the seawater A1 in the storage tank 11 is supplied to the filtration device 12 through the first supply line 15a. The filtered and filtered seawater (filtered seawater A2) is supplied to the electrolyzer 13 through the second supply line 15b as electrolyzed water. The filtered seawater A2 can be selectively supplied to the removal treatment device 14 through the third supply pipe 15c by switching the second switching valve 16c.

[0018] On the other hand, the filtered seawater A2 supplied to the electrolyzer 13 is sterilized by non-diaphragm electrolysis in the electrolyzer 13, and is removed through the third supply line 15c as sterilized seawater (sanitized seawater A3). Supplied to the processing device 14. The sterilized seawater A3 supplied to the removal treatment device 14 is subjected to removal treatment of residual effective chlorine. The non-chlorine seawater A4, which is free of effective chlorine and contains substantially no effective chlorine, is supplied to the aquaculture tank B through the fifth supply line 15f as growth water. The breeding water A4 supplied to the aquaculture tank B forms a good breeding environment for marine organisms.

[0019] Note that the first production apparatus 10a basically drains the cultivating water A4 in the aquaculture tank B at the end of the aquaculture as waste liquid to the adjacent ocean, etc. When there is little interstitial material etc. in the cultivation water A4 in the cultivation tank B at the time of the cultivation, the cultivation water A4 in the cultivation tank B at the end of the cultivation is treated as treated water and filtered through the reflux line 15d. Can be refluxed to 12.

[0020] In the manufacturing apparatus, as the removal treatment device 14 for removing effective chlorine, the negative pressure removal treatment device C1 shown in FIG. 5 or the air publishing removal treatment device shown in FIG. C2 can be employed, and a neutralization removal device for adding sodium thiosulfate for neutralizing available chlorine can be employed for simplification of the device.

A negative pressure removal treatment apparatus C1 shown in FIG. 5 is arranged in a state where a porous pipe 32 is refracted in a tank main body 31, and a negative pressure supply pipe 33 is provided in the tank main body 31. It is consolidated. The negative pressure supply pipe 33 is provided with a decompression pump 33 a in the middle thereof, and is opened in the tank body 31. The porous pipe 32 has innumerable fine pores that allow only gas to pass through. The upstream side is the fourth supply line 15e or the third supply line 15c and the fourth supply line. A fifth supply line 15f is connected to the downstream side 15e.

[0022] In the negative pressure removal treatment apparatus C1 having a powerful configuration, the sterilized seawater A3 is introduced into the porous pipe 32 and flows in the porous pipe 32, and passes through the fourth supply line 15f. Supplied to aquaculture tank B. During this time, negative pressure is supplied into the tank body 31 through the negative pressure supply pipe 33, and the tank body 31 is in a predetermined negative pressure state. For this reason, volatile components contained in the sterilized seawater A3 flowing in the porous pipe 32 pass through the peripheral wall of the porous pipe 32 and flow into the tank body 31, and the suction action of the decompression pump 33 a It is discharged out of the system through the negative pressure supply line 33. A typical example of volatile components contained in sanitized seawater A3 is available chlorine remaining in sanitized seawater A3. For this reason, effective chlorine remaining in the sterilized seawater A3 is almost removed from the sterilized seawater A3 while flowing in the porous pipe 32, and becomes non-chlorine seawater A4 (water for breeding).

[0023] The air publishing removal treatment apparatus C2 shown in FIG. 6 includes a tank body 34, an air introduction pipe 35, and an exhaust pipe 36, and sterilized seawater A3 is introduced into the tank body 34. An introduction pipe 37 and a lead-out pipe 38 for leading the non-chlorine seawater A 4 generated by the removal treatment in the tank body 34 face the bottom. The introduction pipe 37 is connected to the fourth supply line 15e, or the third supply line 15c and the fourth supply line 15e. The outlet pipe 38 is connected to a fifth supply line 15f, and a supply pump 38a is interposed in the middle.

[0024] The air introduction pipe 35 includes an introduction pipe part 35a, an air ejection pipe part 35b, and an air supply pump 35c interposed in the introduction pipe part 35a. The air ejection pipe part 35b has many An air ejection hole 35d is provided and extends along the bottom of the tank body 34. In the air introduction pipe 35, air is supplied to the air ejection pipe part 35b through the introduction pipe part 35a by the air supply pump 35c, and is ejected into the tank main body 34 from the many air ejection holes 35d. For this reason, when the sterilized seawater A3 is accommodated in the tank main body 34, the air is ejected as countless bubbles into the sterilized seawater A3 from the numerous air ejection holes 35d. The air in the bubble form makes sufficient contact with the effective chlorine remaining in the sterilized seawater A3, takes in the effective chlorine, and stays in the upper space in the tank body 34. The retained air containing effective chlorine is exhausted outside the system through the exhaust pipe 36.

[0025] In the air publishing removal treatment apparatus C2 having a powerful structure, the sterilized seawater A3 introduced into the tank body 34 is exposed to countless bubble-like air ejected from the air ejection holes 35d, and remains. The effective chlorine is removed and becomes non-chlorine seawater A4. Non-chlorine seawater A4 is supplied as aquaculture water from the outlet pipe 38 to the aquaculture tank B through the fifth supply line 15f.

[0026] By using the first manufacturing apparatus 10a configured as described above, the first manufacturing method and the second manufacturing method according to the present invention can be implemented. In the first production method, the filtered seawater A2 is supplied to the electrolyzer 13 through the second supply line 15b, and the sterilized seawater A3 is generated by electroless membrane electrolysis in the electrolyzer 13 to produce the sterilized water produced. Seawater A3 is supplied to the removal treatment device 14 through the fourth supply line 15e, the effective chlorine remaining in the sterilized seawater A3 is removed, and the non-chlorine seawater A4 generated by the removal treatment is used as growth water. This is a method of supplying to the culture tank B through the fifth supply line 15f.

In the first production method, the electrolysis conditions in electrolyzer 13 are set so that the concentration of effective chlorine in electrolyzed product water is 10 mgZL or less, preferably 5 mgZL. The generated effective chlorine sterilizes the bacteria in the filtered seawater A2, and the filtered seawater A2 becomes sanitized seawater A3. The sterilized seawater A3 is subjected to the removal treatment of residual effective chlorine in the removal treatment apparatus 14, but it is necessary to perform the removal treatment within a maximum of one hour. It is preferable that the removal treatment be performed promptly without stagnation in the removal treatment apparatus 14 after a predetermined amount of the sterilized seawater A3 is supplied into the removal treatment apparatus 14.

[0028] In the second production method according to the present invention, the filtered seawater A2 is supplied to the electrolyzer 13 through the second supply line 15b and introduced into the third supply line 15c. diaphragm The sterilizing water A generated by electrolysis to produce sterilizing water A is introduced into the third supply line 15c, and the sterilizing water A is mixed with the filtered seawater A2 in the third supply line 15c. As a result, sterilized seawater A3 is generated in the third supply conduit 15c, and the generated sterilized seawater A3 is supplied to the removal processing device 14. The sterilized seawater A3 is treated to remove the remaining effective chlorine in the removal processing device 14 to become non-chlorine seawater A4, and the non-chlorine seawater A4 is supplied as aquaculture water to the aquaculture tank B through the fifth supply line 15f .

[0029] In the second manufacturing method, the electrolysis conditions in the electrolyzer 13 are set so that the concentration of effective chlorine in the electrolyzed product water is higher than lOmgZL, for example, 200 mgZL. The produced effective chlorine has sterilizing ability, and sterilized seawater A3 with an effective chlorine concentration of lOmgZL or less is produced by mixing sterilizing water A with filtered seawater A2. Removal of effective chlorine remaining in the removal seawater A3 in the removal treatment device 14 must be performed within a maximum of 1 hour. It is preferable that the removal treatment is performed promptly without sterilized seawater A3 remaining in the removal treatment apparatus 14.

[0030] The second production apparatus 10b shown in FIG. 2 filters electrolytically generated acidic water (sterilization water) generated by non-diaphragm electrolysis using a dilute aqueous solution of an inorganic salt mainly composed of NaCl as electrolyzed water. It is mixed with seawater to produce sterilized seawater, and effective chlorine remaining in the sterilized seawater is removed. The second manufacturing apparatus 10b has the same configuration as the first manufacturing apparatus 10a except for this point, and can perform a similar manufacturing method. Therefore, in the second manufacturing apparatus 10b, parts and members common to the first manufacturing apparatus 10a are denoted by common reference numerals, and detailed description of the structure is omitted.

[0031] The electrolyzer 13 that constitutes the manufacturing apparatus 10b is mainly composed of a non-diaphragm electrolyzer 13a. The electrolyzer 13a is mainly composed of a supply pipe 13b that supplies tap water and a high-concentration aqueous solution of inorganic salt. A tank 13c and an introduction pipe 13d for introducing a high-concentration aqueous solution into the supply pipe 13b are provided. In the electrolyzer 13, a high concentration aqueous solution of inorganic salt is introduced into the supply line 13b, and a dilute aqueous solution in which the concentration of the inorganic salt is diluted to a predetermined concentration is generated in the supply line 13b. The produced dilute aqueous solution is supplied to the electrolysis chamber R as electrolyzed water and electrolyzed in the electrolysis chamber R.

[0032] The electrolyzed water produced in the electrolysis chamber R is connected to the filter device 12 as seawater A for sterilization. It is introduced into the filtered seawater A2 flowing through the third supply line 15c and mixed. As a result, in the middle of the third supply line 15c, sterilized seawater A3 having a residual effective chlorine concentration of lOmgZL or less is generated. The produced sterilized seawater A3 is supplied to the removal treatment device 14 through the third supply line 15c, and the remaining effective chlorine is quickly removed in the removal treatment device 14. The removed seawater A4 from which the remaining effective chlorine has been removed is supplied to the aquaculture tank B as the water for growth.

[0033] The third production apparatus 20a shown in FIG. 3 mixes electrolytically generated acidic water (sterilization seawater) generated by diaphragm membrane electrolysis using seawater as electrolyzed water, and mixes it with filtered seawater. The effective chlorine remaining in the sterilized seawater is removed. The third production equipment 20a consists of a seawater storage tank 21 for storing seawater A1 collected from the ocean, a filtration device 22 for filtering the seawater A1, and a diaphragm type for electrolyzing the diaphragm using the filtered seawater A2 as electrolyzed water. And the seawater (sterilized seawater A3) produced by mixing the electrolyzed acidic water (sterilization water A) produced by electrolysis with the electrolyzer 23 and the filtered seawater A2 And a removal treatment device 24 for removing effective chlorine remaining in the sterilized seawater A3. In the production apparatus 20a, the storage tank 21, filtration apparatus 22, and removal treatment apparatus 24 other than the electrolysis apparatus 23 are the same as the storage tank 11, filtration apparatus 12, and removal treatment apparatus 14 that constitute the first production apparatus 10a. The thing is adopted.

[0034] In the manufacturing apparatus 20a, the storage tank 21 and the filtration apparatus 22 are connected to each other through the first supply pipe 25a, and are interposed in the first supply pipe 25a. The seawater A1 stored in the storage tank 21 is supplied to the filtration device 22 by driving the pump 26a. On the other hand, the filtration device 22 includes a second supply line 25b connected to the electrolyzer 23, a third supply line 25c connected to the removal treatment device 24, and a reflux line 25d connected to the culture tank B. Yes. The electrolyzer 23 includes a first outflow pipe 25e that communicates with the anode-side electrolysis chamber R1 formed in the electrolytic cell 23a, and a second outflow pipe 25f that communicates with the cathode-side electrolysis chamber R2. The first outflow pipe 25e is connected to the third supply pipe 25c, and the second outflow pipe 25f is connected to a storage tank (not shown). The removal processing device 24 includes a fifth supply line 25g connected to the aquaculture tank B.

[0035] In an aqueous circuit composed of these pipes, a first supply pipe 25a and a reflux pipe 25d The first switching valve 26b is interposed at the connecting portion, and the second switching valve 26c is interposed at the connecting portion between the drain pipe b and the return pipe 25d provided in the culture tank B. In the manufacturing apparatus 20a having the water system circuit, by driving the supply pump 26a, the seawater A1 in the storage tank 21 is supplied to the filtration apparatus 22 through the first supply pipe 25a, filtered, and filtered. The seawater (filtered seawater A2) is supplied as electrolyzed water to the electrolysis chambers Rl and R2 of the electrolyzer 23 through the second supply pipe 25b and to the removal treatment device 24 through the third supply pipe 25c. Supplied.

[0036] The filtered seawater A2 supplied to the electrolyzer 23 is subjected to diaphragm membrane electrolysis in the electrolyzer 23, and electrolyzed acidic water is produced in the anode electrolysis chamber R1, and electrolysis alkaline is produced in the cathode electrolysis chamber R2. Sexual water is produced. The electrolytically generated acidic water is introduced into the third supply line 25c as seawater A for sterilization, mixed with the filtered seawater A2 in the third supply line 25c to generate sterilized seawater A3, and is supplied to the removal treatment device 24. Is done. The electrolytically generated alkaline water is supplied to a storage tank (not shown) through the second outflow pipe 25f and used as various devices, equipment, and other cleaning water.

[0037] In the removal treatment apparatus 24, effective chlorine remaining in the supplied sterilized seawater A3 is removed. Non-chlorine seawater A4 from which effective chlorine has been removed and which does not substantially contain effective chlorine is supplied as aquaculture water to aquaculture tank B through 25 g of the fifth supply line. The breeding water A4 supplied to the aquaculture tank B forms a good breeding environment for marine organisms.

[0038] Similar to the first and second manufacturing apparatuses 10a and 10b, the manufacturing apparatus 20a basically uses the water for cultivation A4 in the aquaculture tank B at the time of completion of the cultivation as a waste liquid to the adjacent ocean or the like. Force to drain Drainage water A4 in the cultivation tank B at the end of the aquaculture When there are few foreign substances in the cultivation water A4 in the cultivation tank B, the cultivation water A4 in the aquaculture tank B at the end of the cultivation is As such, it can be recirculated to the filtration device 22 through the return pipe 25d and reused.

[0039] In the manufacturing method implemented using the manufacturing apparatus 20a, the electrolysis conditions in the electrolysis apparatus 23 are set so that the concentration of effective chlorine in the acid water generated by electrolysis is higher than lOmgZL, for example, about 30 mgZL. To do. The produced effective chlorine has sterilizing ability, and the effective chlorine concentration remaining in the produced sterilized seawater A3 should be less than lOmgZL. Disinfection seawater A3 removal treatment equipment 24 Try to do it quickly.

[0040] A fourth production apparatus 20b shown in FIG. 4 uses electrolytically generated acidic water (sterilization water A) generated by diaphragm membrane electrolysis using a dilute aqueous solution of an inorganic salt mainly composed of NaCl as electrolyzed water. This is mixed with filtered seawater A2 to produce sterilized seawater A3, and the effective chlorine remaining in sterilized seawater A3 is removed. The fourth manufacturing apparatus 20b has the same configuration as the third manufacturing apparatus 20a except for this point, and can perform a similar manufacturing method. Therefore, in the fourth manufacturing apparatus 20b, parts and parts common to the third manufacturing apparatus 20a are denoted by common reference numerals, and detailed description of the structure is omitted.

[0041] The electrolyzer 23 that constitutes the manufacturing apparatus 20b is mainly composed of a diaphragm electrolyzer 23a. The electrolyzer 23a mainly includes a supply pipe 23b that supplies tap water and a high-concentration aqueous solution of inorganic salt. A tank 23c and an introduction line 23d for introducing a high concentration aqueous solution into the supply line 23b are provided. In the electrolyzer 23, a high-concentration aqueous solution is introduced into the supply line 23b, and a dilute aqueous solution in which the concentration of the inorganic salt is diluted to a predetermined concentration is generated in the supply line 23b. The produced dilute aqueous solution is supplied to each electrolysis chamber Rl, R2 as electrolyzed water and electrolyzed in each electrolysis chamber Rl, R2.

[0042] The electrolytically generated acidic water generated in the anode electrolysis chamber R1 is introduced and mixed as sterilized seawater A into the filtered seawater A2 flowing through the third supply pipe 25c. Thereby, sterilized seawater A3 having a residual effective chlorine concentration of lOmgZL or less is generated in the middle of the third supply line 25c. The generated sterilized seawater A3 is supplied to the removal treatment device 24 through the third supply line 25c, and the remaining effective chlorine is quickly removed in the removal treatment device 24. Non-chlorine seawater A4 produced by removing residual available chlorine is supplied to aquaculture tank B as breeding water.

Example

[0043] (Experiment 1): In this experiment, for the sterilized seawater A3 produced by the production method according to the present invention, the reaction between the effective chlorine concentration remaining in the sterilized seawater A3 and the organic compounds contained in the sterilized seawater A3. An experiment was conducted to confirm the behavior of the response over time. In this experiment, as the sterilized seawater A3, which is an intermediate produced by the production apparatus according to the present invention, the remaining effective chlorine is 0.2 mgZL of sterilized seawater (test water 1), and the remaining effective chlorine is 2. OmgZL. Sterilized seawater (sample water 2), residual Effective chlorine is 5.OmgZL sanitized seawater (test water 3), residual effective chlorine is lOmgZL sanitized seawater (test water 4), residual effective chlorine is 27.2 mgZL sanitized seawater (test water) Water 5) was produced, and the amount of organic halide produced when these sterilized seawater A3 was allowed to stand was measured over time. The results obtained for each test water are shown in Table 1 to Table 5.

[0044] [Table 1] Changes in the amount of organic halide produced in sterilized seawater over time

(Note) Test water 0: Seawater with zero effective chlorine concentration in filtered seawater

Test water 1: sterilized seawater with residual effective chlorine concentration Q of 2 mg / L

Immediately after, lhr, 6hr: Immediately after generation of sterilized seawater, 1 hour, 6 hours later

[0045] [Table 2]

Temporal changes in the amount of organic halide produced in sanitized seawater

Test water 2: Residual effective chlorine concentration 2. (immediately after kg / L of sterilized seawater, lhr, 6hr: immediately after sterilized seawater is generated, 1 hour later, 6:00

Temporal change in the amount of organic halide produced in sanitized seawater

Test water 3: Residual effective chlorine concentration 5. Immediately after sterilized seawater with Qmg / L, lhr, 6hr: Immediately after producing sterilized seawater, 1 hour, 6 hours later

Temporal change in the amount of organic halide produced in sanitized seawater

(Note) Test ice 0: Seawater with zero effective chlorine concentration in filtered seawater

Test water 4: Immediately after sterilized seawater with residual effective chlorine concentration I Qmg / L, lhr, 6hr: Immediately after producing sterilized seawater, 1 hour later, 6:00

Temporal change in the amount of organic halide produced in sanitized seawater

Test water 4: sterilized seawater with residual effective chlorine concentration of 27.2 mg / L

Immediately, lhr, 6hr: Immediately after generation of sterilized seawater, 1 hour, 6 hours later

[0049] Referring to each table, a particularly notable compound is bromoform, a kind of trihalomethane. Bromoform is derived from hypochlorous acid, which is an effective chlorine component remaining in sterilized seawater A3, and bromine that is potentially contained in seawater, and is a chemical that is suspected as a carcinogenic substance. It is a substance. The amount of bromoform produced in the sterilized seawater A3 increases significantly in proportion to the standing time of the sterilized seawater A3. Therefore, in order to reduce the amount of bromoform produced in the sterilized seawater A3, it is important to remove the effective chlorine remaining in the sterilized seawater A3 as quickly as possible.

The data in Table 1 suggests an incubation time of 1 hour as a measure for reducing the amount of bromoform produced. Therefore, in order to significantly reduce the amount of bromoform produced in the sterilized seawater A3, the effective chlorine remaining in the sterilized seawater A3 should be removed within a maximum of 1 hour. It is important to remove the seawater A3 immediately after it has been generated without leaving it.

[0050] (Experiment 2): In this experiment, growth was achieved by removing residual effective chlorine from the sterilized seawater A3. In order to confirm the safety of raw water A4, a mutagenicity test (Ames test) using two types of water for breeding A3 was attempted. The Ames test is a widely used mutagenicity test that is a means of detecting genotoxicity of mutagens and carcinogens in environmental samples of complex composition containing many chemical substances. . In this experiment, as the growth water A4 used for the mutagenicity test, the growth water (test water 6) obtained by subjecting the removed seawater A3 with 0.3 mgZL of residual effective chlorine to the removal treatment and residual The water used for the cultivation (test water 7), which was obtained by subjecting the removed seawater A3 with effective chlorine of 3. Omg / L to the removal treatment, was adopted. In the mutagenicity test, the preincubation method was adopted.

[0051] First, when 62.5 ~: LOOO μL of test water, which is the test solution, is dispensed into a sterile test tube and metabolic activation is performed, 0.5 mL of S9mix is added and positive. For the control only, in the case of the direct method, add 0.5 mL of 0.1 M sodium-phosphate buffer, and add 100 L of the precultured test strain suspension. Next, preincubate the vigorous test tube while shaking for 20 minutes at 37 ° C in a shaking culture bath (56 min Zmin). After pre-incubation, cover the top agar adjusted to 50 ° C. In the case of the direct method, add 0.5 mL of 0.1 M sodium phosphate buffer before preparing the top agar. Control seawater and positive control substances should be sterilized by filtration. As test strains, Salmonella typhimurium TA98 strain and TA100 strain were employed.

[0052] [Table 6] Topagar composition

[0053] The top agar employs three types of top agar A, B, C with the composition shown in Table 6 and tested. Add 2111] ^ top agar 8 when the amount of liquid added is 62.5-250, and add 1.5 mL of top agar B when the amount of liquid added is 500 L. If the addition amount is 1 000 L, add TopAgar C in 1 mL. In this state, mix carefully in the test tube so that bubbles do not form, pour the test tube contents onto the minimum glucose agar culture on the plate and spread it quickly and evenly. Then invert the plate and incubate at 37 ° C for 48 hours. At the end of the culture, count the number of colonies caused by back mutations on the plate. The results obtained are shown in Table 7 and Table 8.

[0054] Generally, the mutagenicity is determined to be positive when the number of revertant colonies of the test substance increases more than twice that of the positive control and a dose dependency is observed. Under this test condition, mutagenic ability is not observed.

[0055] [Table 7]

Ame s test results

(Note) Breeding water: Breeding water made from sterilized seawater with 0.3 mg / L of available residual chlorine as raw water

S9Mix (-): Metabolic activation system

S9Mix (-): System without metabolic activation (direct method)

TA98: Salmonella typhimurium TA98 strain

TA100: Salmonella typhimurium TA100 strain Am es test results

S9Mix (+): Metabolic activation system

S9Mix (-): System without metabolic activation (direct method)

TA98: Salmonella typhi dish rium TA98 strain

TA100: Salmonella ty hi murium TA100 strain

Claims

The scope of the claims

[1] A filtration process for filtering seawater, an electrolysis process for electrolyzing the filtered seawater to produce sterilized seawater whose effective chlorine concentration is 10 mg / L or less, and the same electrolysis process A method for producing water for breeding marine organisms, comprising an effective chlorine removal treatment process that removes effective chlorine remaining in the sterilized seawater within 1 hour.

[2] A filtration process for filtering seawater, an electrolysis process for electrolyzing a dilute aqueous solution of inorganic salt to produce sterilization water, and sterilization water generated in the same electrolysis process into the filtered seawater The sterilized seawater generation process that produces mixed sterilized seawater with an effective chlorine concentration of 10 mg / L or less and the effective chlorine remaining in the sterilized seawater generated in the sterilized seawater generated process A method for producing seawater for breeding marine organisms, comprising a process for removing effective chlorine that is removed within 1 hour after the production of fungal seawater.

[3] A filtration device that filters seawater, an electrolysis device that produces sterilized seawater by electrolyzing the filtered seawater, and an effective salt remaining in the sterilized seawater produced by the electrolysis device And an effective chlorine removal treatment device for removing elemental water, and the electrolyzer generates sterilized seawater having an effective chlorine concentration of 10 mg / L or less, and the effective chlorine remaining in the generated sterilized seawater is the same. An apparatus for producing water for cultivating marine organisms, which is removed by the removal apparatus within one hour after the generation of sanitized seawater.

[4] A filtration device for filtering seawater, an electrolysis device for electrolyzing a diluted aqueous solution of inorganic salt to produce sterilization water, and sterilization water generated by the electrolysis device are mixed with the filtered seawater. And sterilized seawater generating means for generating sterilized seawater, and an effective chlorine removal treatment device for removing effective chlorine remaining in the sterilized seawater generated by the sterilized seawater generated means. The device produces sterilized seawater with an effective chlorine concentration of 10 mg / L or less, and removes the effective chlorine concentration remaining in the generated sterilized seawater within one hour after the generation of the sterilized seawater. Seawater production equipment for growing marine organisms.