JP2006238769A - Method for producing water for growing marine organism and apparatus for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress production of an organic halogen compound caused by the remaining active chlorine in the water for growing marine organism comprising sterilized seawater produced by electrolysis of seawater or sterilized seawater produced by blending the sterilized water with seawater. <P>SOLUTION: The invention relates to the method for producing water used for growing marine organism such as sea animals or sea plants comprising a filtration process filtrating seawater, an electrolytic treating process producing sterilized seawater by carrying out none-diaphragm electrolysis or diaphragm electrolysis to the seawater treated with the filtration process, and removing process for removing active chlorine remaining in the sterilized seawater produced by the electrolysis process, wherein the electrolysis process produces the sterilized seawater with active chlorine concentration of ≤10 mg/L and the sterilized seawater produced is subjected to the removing process within 1 hr at longest to remove the active chlorine. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is used for growing marine animals such as tuna, hamachi, flounder and red sea bream, marine shellfish such as oysters and scallops, seaweed such as seaweed, zooplankton and plankton such as phytoplankton. And it is related with the manufacturing method and manufacturing apparatus of the water for cultivation used in order to grow a marine plant. In the present invention, these marine animals and marine plants are collectively defined as marine organisms, and the growth of marine animals and the growth of marine plants are collectively defined as breeding.

  In aquaculture farms that intensively cultivate marine organisms, it is important to create an environment suitable for marine organism hatching, growth, growth, etc. Most involved. For this reason, as water for breeding for forming a good breeding environment for marine organisms, seawater having good characteristics that is clean and sufficiently sterilized and has no or almost no fish disease bacteria is required.

  As a means for sterilizing seawater used as breeding water, generally, ultraviolet light is irradiated to seawater, seawater is heat-treated, seawater is precisely filtered, and various disinfectants and disinfectants are added to seawater. There are ways to do this. These methods of disinfecting seawater may be too costly in view of the growth or growth costs of marine organisms. Some seawater generated by adopting these sterilization methods cannot form a good growing environment. In the simplest method that does not require a large apparatus, a disinfectant or a disinfectant is added, which may generate a residue in seawater that is not necessarily good for the growth of marine organisms.

  In recent years, focusing on the sterilizing ability of electrolyzed water generated by electrolyzing seawater, the method of sterilizing seawater by electrolytic treatment or electrolyzed water having sterilizing ability generated by electrolysis has been added to seawater. A method for sterilization treatment has been proposed. These sterilization treatment methods are advantageous in terms of cost compared to the above-described conventional sterilization treatment methods, and do not generate residues that affect growth caused by disinfectants and disinfectants. There is an advantage. However, the electrolyzed water having sterilizing ability produced by electrolysis using seawater as the electrolyzed water contains more effective chlorine than is consumed in the sterilization treatment of seawater, so it is used as water for breeding. A significant amount of available chlorine remains in the seawater. For this reason, the seawater that is the water for cultivating has a sterilizing ability even if the degree is low, and it adversely affects the growth of microalgae and the like, and adversely affects the growth of microalgae and the like. . For example, microalgae are an important food for culturing marine invertebrate larvae, and therefore, a growing environment that adversely affects the growth of microalgae is a good environment for marine organisms. Can not.

  Therefore, it is important that seawater as water for breeding that forms a good environment for marine life does not adversely affect the growth of microalgae and the like. The present applicant has already applied for a patent for the marine organism breeding water, the breeding water production method, and the production apparatus that deal with such problems (see Patent Document 1).

The water for breeding proposed in Patent Document 1 described above is seawater that has been sterilized by electrolytically generated water that uses a dilute aqueous solution of inorganic salt as electrolyzed water, and is seawater that has been neutralized in sterilizing ability. is there. Since the water for cultivating is in a state where the seawater is sterilized by electrolysis and is aseptic or near-sterile and the sterilizing ability is neutralized, it does not adversely affect the growth of microalgae, etc. A favorable breeding environment can be formed.
JP 2003-144001 A

  The inventors of the present invention confirmed that the water for breeding proposed in Patent Document 1 described above can form a good breeding environment for the growth of marine organisms, and conducted extensive research on the method for producing the water for breeding. As a result, in order to neutralize the sterilizing ability of seawater that has been sterilized by electrolysis, the effective chlorine remaining in the sterilizing seawater that remains in the sterilized seawater should be kept as small as possible. In order to remove the available chlorine accurately, and to remove the available chlorine remaining in the seawater, the timing of the treatment is important.

  In particular, regarding the timing for removing effective chlorine remaining in the seawater, it is important that the seawater be sterilized within a predetermined time, and remains in the sterilized seawater. Organohalogen compounds are produced due to available chlorine, and the amount of organohalogen compounds produced tends to increase over time. Since organic halogen compounds such as trihalomethane are compounds that have been pointed out to be carcinogenic, it is necessary to suppress their production as low as possible.

  The present invention has been made based on these findings, and an object of the present invention is to provide a production method and a production apparatus for growing water corresponding to these findings. It is to sufficiently suppress the formation of organic halogen compounds resulting from effective chlorine.

  The present invention relates to a method and an apparatus for producing water for cultivating marine organisms, and more particularly, to a production method and an apparatus for producing cultivating water used for growing or growing marine organisms such as marine animals and marine plants.

  The first production method of the production method according to the present invention includes a filtration treatment step of filtering seawater, and an electrolytic treatment step of generating sterilized seawater by subjecting the filtered seawater to non-diaphragm electrolysis or separation membrane electrolysis. And a removal treatment step for removing effective chlorine remaining in the sterilized seawater (sanitized seawater) produced in the electrolytic treatment step, wherein the effective chlorine concentration is 10 mg / L or less in the electrolytic treatment step. The sterilized seawater is generated, and effective chlorine is removed from the generated sterilized seawater in the removal treatment step within a maximum of 1 hour.

  A second production method of the production method according to the present invention includes a filtration treatment step for filtering seawater, an electrolytic treatment step for producing sterilization water by subjecting a diluted aqueous solution of inorganic salt to non-membrane membrane electrolysis or diaphragm membrane electrolysis, The sterilization seawater production process that produces sterilized seawater by mixing the sterilizing water produced in the electrolytic treatment process with the filtered seawater, and the remaining in the sterilized seawater produced in the sterilized seawater production process A removal treatment step for removing chlorine; and in the sterilization seawater production step, sterilization seawater having an effective chlorine concentration of 10 mg / L or less is produced, and the produced sterilization seawater is produced within a maximum of 1 hour in the removal treatment step. It is characterized by removing effective chlorine.

  Moreover, this invention is a manufacturing apparatus for enforcing each manufacturing method which concerns on this invention, The 1st manufacturing apparatus of the manufacturing apparatus which concerns on this invention was filtered and the filtration apparatus which filters seawater A diaphragm-type or diaphragm-type electrolyzer that produces sterilized seawater by electrolysis or electrolysis of seawater, and removal that removes effective chlorine remaining in the sterilized seawater produced by the electrolyzer A sterilization seawater having an effective chlorine concentration of 10 mg / L or less is generated in the electrolysis apparatus, and the sterilization seawater is removed from the generated sterilization seawater within a maximum of 1 hour by the removal treatment apparatus. It is what.

  The second production apparatus of the production apparatus according to the present invention includes a filtration apparatus that filters seawater, and a diaphragm-type or diaphragm-type electrolysis that generates sterilization water by using a diaphragm aqueous solution or a diaphragm membrane electrolysis with a diluted aqueous solution of an inorganic salt. In the sterilized seawater produced by the device, the sterilized seawater producing means for producing the sterilized seawater by mixing the sterilizing water produced in the electrolyzer with the filtered seawater, A removal treatment device for removing residual effective chlorine is provided, and the sterilized seawater generating device generates sterilized seawater having an effective chlorine concentration of 10 mg / L or less, and the generated sterilized seawater is removed within a maximum of 1 hour. The effective chlorine is removed by the processing apparatus.

  According to the production method and the production apparatus of the present invention, seawater that has been sterilized with little or no bacteria, seawater with particularly low trihalomethane content in the organohalogen compound, and negative mutagenesis-inducing performance. Can be obtained. The seawater is extremely excellent as water for cultivating marine organisms, and by using the seawater as cultivating water, it is possible to form a favorable environment for marine organisms. Moreover, since the said seawater has little content of an organic halogen compound, the waste liquid after use as water for cultivation does not contaminate seawater, such as the ocean which should be drained. In this respect, the seawater is extremely useful as water for breeding marine organisms.

  The present invention relates to a method and apparatus for producing water for breeding marine organisms. FIGS. 1 and 2 show a first manufacturing apparatus 10a and a second manufacturing apparatus 10b that employ a diaphragm-type electrolysis apparatus, and FIGS. 3 and 4 employ a diaphragm-type electrolysis apparatus. A third manufacturing apparatus 20a and a fourth manufacturing apparatus 20b are shown.

  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. . The first manufacturing apparatus 10a includes a seawater storage tank 11 for storing seawater collected from the ocean, a filtration apparatus 12 for filtering seawater, a diaphragm-type electrolytic apparatus 13 for performing diaphragmless electrolysis using seawater as electrolyzed water, and A removal treatment device 14 for removing effective chlorine remaining in electrolyzed water (sanitized seawater) produced by electrolysis in the electrolysis device 13 is provided. The storage tank 11 and the filtration device 12 are connected to each other through a first supply line 15a, and are stored in the storage tank 11 by driving a supply pump 16a interposed in the first supply line 15a. The seawater is supplied to the filtration device 12.

  On the other hand, the filtration device 12 includes a second supply line 15b connected to the electrolysis device 13, a third supply line 15c connected to the removal processing device 14, and a reflux line 15d connected to the culture tank B described later. ing. In addition, the electrolysis apparatus 13 includes a fourth supply pipe 15e connected to the removal processing apparatus 14, and the removal processing apparatus 14 includes a fifth supply pipe 15f connected to the culture tank B. In an aqueous circuit constituted by these pipelines, a first switching valve 16b is interposed at a connecting portion between the first supply pipeline 15a and the reflux pipeline 15d, and the second supply pipeline 15b and the third supply pipeline are connected. A second switching valve 16c is interposed in the connecting portion 15c. Further, the aquaculture tank B is provided with a drain pipe b, and the reflux pipe 15d is connected to the drain pipe b, and a third switching valve 16d is interposed in this connecting portion.

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

  On the other hand, the filtered seawater A2 supplied to the electrolyzer 13 is sterilized by non-membrane electrolysis in the electrolyzer 13, and is removed as sanitized seawater (sanitized seawater A3) through the third supply line 15c. To be supplied. The sterilized seawater A3 supplied to the removal processing apparatus 14 is subjected to removal treatment of residual effective chlorine. 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 the aquaculture tank B through the fifth supply line 15f. The breeding water A4 supplied to the aquaculture tank B forms a good breeding environment for marine organisms.

  The first manufacturing 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 or the like, but the aquaculture at the end of the aquaculture When there is little foreign matter in the cultivating water A4 in the tank B, the cultivating water A4 in the culture tank B at the end of the cultivation is returned to the filtration device 12 through the reflux line 15d as treated water. You can also.

  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 bubbling removal treatment device C2 shown in FIG. 6 can be adopted. In order to simplify the apparatus, it is possible to employ a neutralizing removal apparatus in which sodium thiosulfate for neutralizing effective chlorine is added.

  The negative pressure removal processing apparatus C1 shown in FIG. 5 is configured by disposing a porous pipe 32 in a refracted state in a tank body 31, and a negative pressure supply pipe 33 is connected to the tank body 31. Yes. A decompression pump 33 a is interposed in the negative pressure supply pipe 33 and opens in the tank body 31. The porous pipe 32 has countless fine holes that allow only gas to pass through, and is connected to the fourth supply line 15e or the third supply line 15c and the fourth supply line 15e on the upstream side. In addition, the fifth supply line 15f is connected to the downstream side.

  In the negative pressure removal processing apparatus C1 having such a configuration, the sterilized seawater A3 is introduced into the porous pipe 32 and flows in the porous pipe 32, and is supplied to the culture tank B through the fourth supply line 15f. Is done. During this time, negative pressure is supplied into the tank main body 31 through the negative pressure supply pipe 33, and the tank main body 31 is in a predetermined negative pressure state. For this reason, the volatile components contained in the sterilized seawater A3 flowing in the porous pipe 32 permeate the peripheral wall of the porous pipe 32 and flow into the tank body 31, and the negative pressure is reduced by the suction action of the decompression pump 33 a. It is discharged out of the system through the pressure supply line 33. A representative example of the volatile component contained in the sterilized seawater A3 is effective chlorine remaining in the sterilized seawater A3. For this reason, the 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 (growing water).

  An air bubbling type removal treatment apparatus C2 shown in FIG. 6 includes a tank body 34, an air introduction pipe 35, and an exhaust pipe 36. In the tank body 34, an introduction pipe 37 that introduces sterilized seawater A3, A lead-out pipe 38 for leading the non-chlorine seawater A4 generated by the removal process in the tank body 34 faces 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 thereof.

  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 portion 35 b includes a large number of air ejection holes 35 d and extends along the bottom portion in the tank main 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 a large number of air ejection holes 35d. For this reason, when the sterilized seawater A3 is accommodated in the tank body 34, the air is ejected from the numerous air ejection holes 35d into the sterilized seawater A3 as countless bubbles. The bubble-like air sufficiently contacts with the effective chlorine remaining in the sterilized seawater A3, takes in the effective chlorine, and stays in the upper space in the tank main body 34. The air containing the available effective chlorine is exhausted out of the system through the exhaust pipe 36.

  In the air bubbling removal processing apparatus C2 having such a configuration, the sterilized seawater A3 introduced into the tank main body 34 is exposed to countless air bubbles ejected from the air ejection holes 35d to remove residual effective chlorine. It becomes non-chlorine seawater A4. The non-chlorine seawater A4 is supplied from the outlet pipe 38 to the aquaculture tank B through the fifth supply pipe 15f as the growth water.

  If the 1st manufacturing apparatus 10a comprised in this way is used, the 1st manufacturing method and the 2nd manufacturing method which concern on this invention can be implemented. In the first production method, filtered seawater A2 is supplied to the electrolysis apparatus 13 through the second supply line 15b, and the sterilization seawater A3 is generated by electroless separation electrolysis in the electrolysis apparatus 13 and the sterilization produced. The 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 the growth water. 5 is a method of supplying to the culture tank B through the supply line 15f.

  In the first manufacturing method, the electrolysis conditions in the electrolyzer 13 are set so that the concentration of effective chlorine in the electrolyzed water is 10 mg / L or less, preferably 5 mg / L. The produced effective chlorine sterilizes bacteria in the filtered seawater A2, and the filtered seawater A2 is used as sanitized seawater A3. The sterilized seawater A3 is subjected to the removal treatment of the remaining 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 processing is performed promptly without stagnation in the removal processing device 14 after a predetermined amount of the sterilized seawater A3 is supplied into the removal processing device 14.

  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, and the electrolyzer 13 performs electroless membrane electrolysis. The sterilizing water A generated by producing the 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. Thereby, sterilized seawater A3 is generated in the third supply pipe 15c, and the generated sterilized seawater A3 is supplied to the removal processing device 14. The sterilized seawater A3 is subjected to a removal treatment of residual effective chlorine in the removal processing apparatus 14 to become non-chlorine seawater A4, and the non-chlorine seawater A4 is supplied to the aquaculture tank B through the fifth supply line 15f as the growth water. .

  In the second manufacturing method, the electrolysis conditions in the electrolyzer 13 are set so that the concentration of effective chlorine in the electrolyzed water is higher than 10 mg / L, for example 200 mg / L. The produced effective chlorine has sterilizing ability, and by mixing the sterilizing water A with the filtered seawater A2, sterilized seawater A3 having an effective chlorine concentration of 10 mg / L or less is produced. The removal treatment of the effective chlorine remaining in the removal seawater A3 in the removal treatment apparatus 14 needs to be performed within a maximum of 1 hour. It is preferable that the removal process is performed quickly without causing the sterilized seawater A3 to stay in the removal processing apparatus 14.

  The second manufacturing apparatus 10b shown in FIG. 2 mixes electrolytically generated acidic water (sterilization water) generated by diaphragmless electrolysis using a dilute aqueous solution of an inorganic salt mainly composed of NaCl as electrolyzed water into filtered seawater. Thus, sterilized seawater is generated, 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. Accordingly, 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.

  The electrolyzer 13 constituting the manufacturing apparatus 10b is mainly composed of a diaphragm electrolyzer 13a, and includes a supply pipe 13b for supplying tap water, and a preparation tank 13c for preparing a high concentration aqueous solution of inorganic salt. In addition, an introduction conduit 13d for introducing a high concentration aqueous solution into the supply conduit 13b is 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.

  The electrolyzed water produced in the electrolysis chamber R is introduced and mixed as sterilized seawater A into the filtered seawater A2 flowing through the third supply line 15c connected to the filtration device 12. Thereby, sterilized seawater A3 having a residual effective chlorine concentration of 10 mg / L or less is generated in the middle of the third supply pipeline 15c. The produced sterilized seawater A3 is supplied to the removal processing device 14 through the third supply pipe 15c, and the remaining effective chlorine is quickly removed in the removal processing device 14. The removed seawater A4 from which the remaining effective chlorine has been removed is supplied to the aquaculture tank B as growth water.

  The 3rd manufacturing apparatus 20a shown in FIG. 3 produces | generates sanitization seawater by mixing the electrolysis production | generation acidic water (seawater for sterilization) produced | generated by the diaphragm membrane electrolysis which uses seawater as electrolyzed water, and filtered seawater, The effective chlorine remaining in the sterilized seawater is removed. The third manufacturing apparatus 20a includes a seawater storage tank 21 for storing seawater A1 collected from the ocean, a filtration apparatus 22 for filtering the seawater A1, and a diaphragm-type electrolyzer for performing diaphragm membrane electrolysis using the filtered seawater A2 as electrolyzed water. 23 and seawater (sterilized seawater A3) generated by mixing electrolytically generated acidic water (sterilization water A) and filtered seawater A2 produced by being electrolyzed in the electrolyzer 23 and receiving the sterilized water A removal processing device 24 for removing effective chlorine remaining in the seawater A3 is provided. In the manufacturing apparatus 20a, the storage tank 21, the filtration apparatus 22, and the removal processing apparatus 24 other than the electrolysis apparatus 23 are the same as the storage tank 11, the filtration apparatus 12, and the removal processing apparatus 14 that constitute the first manufacturing apparatus 10a. Is adopted.

  In the manufacturing apparatus 20a, the storage tank 21 and the filtration apparatus 22 are connected to each other through the first supply pipeline 25a, and by driving the supply pump 26a interposed in the first supply pipeline 25a, The seawater A1 stored in the storage tank 21 is supplied to the filtration device 22. 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 processing device 24, and a reflux line 25d connected to the culture tank B. . The electrolysis device 23 includes a first outflow pipe 25e communicating with the anode side electrolysis chamber R1 formed in the electrolytic cell 23a, and a second outflow pipe 25f communicating 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 pipe 25g connected to the culture tank B.

  In an aqueous circuit composed of these pipes, a first switching valve 26b is interposed at a connecting portion between the first supply pipe 25a and the reflux pipe 25d, and a drain pipe b provided in the culture tank B is provided. And a second switching valve 26c is interposed at the connecting portion between the reflux line 25d. In the manufacturing apparatus 20a having the water system circuit, the seawater A1 in the storage tank 21 is supplied to the filtration device 22 through the first supply line 25a, filtered, and filtered by driving the supply pump 26a. Seawater (filtered seawater A2) is supplied as electrolyzed water to the electrolysis chambers R1 and R2 of the electrolyzer 23 through the second supply line 25b and to the removal treatment device 24 through the third supply line 25c. .

  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-side electrolysis chamber R1, and electrolyzed alkaline water is produced in the cathode-side electrolyzer R2. . 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 processing device 24. Is done. Further, 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.

  In the removal processing device 24, effective chlorine remaining in the supplied sanitized seawater A3 is removed. The non-chlorine seawater A4 from which the effective chlorine is removed and does not substantially contain the effective chlorine is supplied to the aquaculture tank B through the fifth supply line 25g as the growth water. The breeding water A4 supplied to the aquaculture tank B forms a good breeding environment for marine organisms.

  Similar to the first and second manufacturing apparatuses 10a and 10b, the manufacturing apparatus 20a basically drains the cultivating water A4 in the aquaculture tank B at the end of the cultivation as waste liquid to the adjacent ocean or the like. However, when there is little interstitial material in the cultivating water A4 in the culturing tank B at the end of the cultivation, the cultivating water A4 in the culturing tank B at the end of the culturing is used as treated water as a return pipe. It can be recycled to the filtration device 22 through the path 25d and reused.

  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 electrolytically generated acidic water is higher than 10 mg / L, for example, about 30 mg / L. To do. The produced effective chlorine has sterilizing ability, and the concentration of effective chlorine remaining in the produced sterilized seawater A3 is set to 10 mg / L or less. The removal treatment in the removal treatment apparatus 24 of the sterilized seawater A3 is performed quickly without retaining the sterilized seawater A3 for a long time.

  The fourth production apparatus 20b shown in FIG. 4 filters the electrolytically generated acidic water (sterilization water A) generated by diaphragm membrane electrolysis using a dilute aqueous solution of inorganic salt containing NaCl as a main component to be electrolyzed water seawater A2. To produce sterilized seawater A3 and to remove the effective chlorine remaining in the sterilized seawater A3. 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 4th manufacturing apparatus 20b, about the components and members which are common in the 3rd manufacturing apparatus 20a, a common code | symbol is attached | subjected and detailed description of the structure is abbreviate | omitted.

  The electrolyzer 23 constituting the manufacturing apparatus 20b is mainly composed of a diaphragm electrolyzer 23a, but includes a supply pipe 23b for supplying tap water, and a preparation tank 23c for preparing a highly concentrated aqueous solution of inorganic salt. In addition, an introduction pipe line 23d for introducing a high concentration aqueous solution into the supply pipe line 23b is provided. In the electrolyzer 23, a high-concentration aqueous solution is introduced into the supply conduit 23b, and a diluted aqueous solution in which the concentration of the inorganic salt is diluted to a predetermined concentration is generated in the supply conduit 23b. The produced dilute aqueous solution is supplied to each electrolysis chamber R1, R2 as electrolyzed water and electrolyzed in each electrolysis chamber R1, R2.

  The electrolytically generated acidic water generated in the anode side electrolysis chamber R1 is introduced and mixed as filtered seawater A2 flowing through the third supply pipe 25c as sterilizing seawater A. Thereby, sterilized seawater A3 having a residual effective chlorine concentration of 10 mg / L or less is generated in the middle of the third supply pipeline 25c. The produced sterilized seawater A3 is supplied to the removal processing device 24 through the third supply pipe 25c, and the remaining effective chlorine is quickly removed in the removal processing device 24. The non-chlorine seawater A4 produced by removing the remaining effective chlorine is supplied to the aquaculture tank B as water for breeding.

  (Experiment 1): In this experiment, regarding 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 compound contained in the sterilized seawater A3 An experiment to confirm the behavior was attempted. In this experiment, as the sterilized seawater A3 which is an intermediate produced by the production apparatus according to the present invention, the sterilized seawater (test water 1) having a residual effective chlorine of 0.2 mg / L, and the residual effective chlorine is 2 0.0 mg / L of sterilized seawater (test water 2), sterilized seawater with residual effective chlorine of 5.0 mg / L (sample water 3), and sterilized seawater with 10 mg / L of residual effective chlorine (sample water) Sample water 4), sterilized seawater (test water 5) with a residual effective chlorine content of 27.2 mg / L was produced, and the amount of organic halide produced when these sterilized seawater A3 was allowed to stand over time It was measured. The results obtained for each test water are shown in Tables 1-5.

  Referring to the tables, one compound of particular interest is bromoform, a type 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 suspected as a carcinogenic substance. It is a substance. The production amount of bromoform in the sterilized seawater A3 increases remarkably in proportion to the standing time of the sterilized seawater A3. For this reason, 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 a standing time of 1 hour as a measure for reducing the amount of bromoform produced. Therefore, in order to greatly 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 one hour from the time when the sterilized seawater A3 is produced. However, preferably, after the removal seawater A3 is generated, the removal treatment is performed promptly without leaving it.

  (Experiment 2): In this experiment, mutagenicity using two kinds of breeding water A3 to confirm the safety of the breeding water A4 obtained by removing the remaining effective chlorine in the sterilized seawater A3. A test (Ames test) was attempted. The Ames test is a widely used mutagenicity test that is a means of detecting genotoxicity of mutagens and carcinogens from 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 removal seawater A3 with 0.3 mg / L of residual effective chlorine to the removal treatment, and the residual water The growth water (test water 7) obtained by subjecting the removal seawater A3 having an effective chlorine content of 3.0 mg / L to the removal treatment was employed. In the mutagenicity test, a preincubation method was adopted.

  First, when 62.5 to 1000 μL of test water, which is the test solution, is dispensed into a sterilized test tube and the metabolic activation method is performed, 0.5 mL of S9mix is added, and only the positive control is the direct method. Add 0.5 mL of 0.1M sodium-phosphate buffer and add 100 μL of pre-cultured test strain suspension. Next, the test tube is pre-incubated while being shaken (37 reciprocations / min) at 37 ° C. for 20 minutes in a shaking culture thermostat. After pre-incubation, top agar adjusted to 50 ° C. is added. In the case of the direct method, 0.5 mL of 0.1 M sodium-phosphate buffer is added before adding the top agar. Control seawater and positive control substances are sterilized by filtration. As test strains, Salmonella typhimurium TA98 strain and TA100 strain were employed.

  As the top agar, three types of top agar A, B, C having the composition shown in Table 6 are adopted. When the amount of the test solution added is 62.5 to 250 μL, 2 mL of the top agar A is added, and the test solution When the addition amount of 500 μL is added, 1.5 mL of top agar B is added, and when the addition amount of the test solution is 1000 μL, 1 mL of top agar C is added. In this state, mix in a test tube, taking care not to generate bubbles, and pour the test tube contents onto the minimal glucose agar culture on the plate, which is spread quickly and evenly. Thereafter, the plate is turned upside down and incubated at 37 ° C. for 48 hours. After completion of the culture, the number of colonies generated by back mutation on the plate is counted. The obtained results are shown in Table 7 and Table 8.

  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 dose dependency is observed. No mutagenic activity is observed under the test conditions.

It is a schematic structure figure showing typically the 1st manufacturing device which is one embodiment of the manufacturing device concerning the present invention. It is a schematic block diagram which shows typically the 2nd manufacturing apparatus which is other one Embodiment of the manufacturing apparatus which concerns on this invention. It is a schematic block diagram which shows typically the 3rd manufacturing apparatus which is other one Embodiment of the manufacturing apparatus which concerns on this invention. It is a schematic block diagram which shows typically the 4th manufacturing apparatus which is other one Embodiment of the manufacturing apparatus which concerns on this invention. It is a schematic block diagram which shows typically the negative pressure type removal processing apparatus which is an example of the removal processing apparatus employ | adopted with the manufacturing apparatus which concerns on this invention. It is a schematic block diagram which shows typically the air bubble ring type removal processing apparatus which is another example of the removal processing apparatus employ | adopted with the manufacturing apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10a ... 1st manufacturing apparatus, 10b ... 2nd manufacturing apparatus, 11 ... Storage tank, 12 ... Filtration apparatus, 13 ... Electrolysis apparatus, 13a ... Electrolysis tank, 13b ... Supply line, 13c ... Preparation tank, 13d ... Introduction Pipe line, 14 ... removal treatment device, 15a ... first supply line, 15b ... second supply line, 15c ... third supply line, 15d ... reflux line, 15e ... fourth supply line, 15f ... first 5 supply lines, 16a ... supply pump, 16b ... first switching valve, 16c ... second switching valve, 16d ... third switching valve, R ... electrolysis chamber, 20a ... third manufacturing device, 20b ... fourth manufacturing Apparatus, 21 ... Reservoir tank, 22 ... Filtration apparatus, 23 ... Electrolyzer, 23a ... Electrolyzer, 23b ... Supply line, 23c ... Preparation tank, 23d ... Introduction line, 24 ... Removal treatment apparatus, 25a ... First supply Pipe line, 25b ... second supply pipe line, 25c ... Supply line, 25d ... Reflux line, 25e ... First outflow line, 25f ... Second outflow line, 25g ... Fourth supply line, 26a ... Supply pump, 26b ... First switching valve, 26c ... Second Switching valve, R1, R2 ... Electrolysis chamber, C1 ... Negative pressure removal treatment device, C2 ... Air bubbling removal treatment device, 31 ... Tank body, 32 ... Porous pipe, 33 ... Negative pressure supply line, 33a ... Pressure reduction pump 34 ... Tank body, 35 ... Air introduction pipe, 35a ... Introduction pipe section, 35b ... Air ejection pipe section, 35c ... Air supply pump, 35d ... Air ejection hole, 36 ... Exhaust pipe, 37 ... Introduction pipe, 38 ... Derivation Pipe, 38a ... feed pump, B ... culture tank. b ... drainage pipe, A ... sterilization water, A1 ... seawater, A2 ... filtered seawater, A3 ... sanitized seawater, A4 ... non-chlorine seawater (water for breeding).

Claims (4)

This is a production method for producing water for breeding used for growing or growing marine organisms such as marine animals and marine plants. The production method is a filtration treatment step for filtering seawater and a filtration treatment step in the filtration treatment step. Electrolytic treatment process to produce sterilized seawater by non-diaphragm electrolysis or diaphragm membrane electrolysis, and removal treatment process to remove effective chlorine remaining in the sterilized seawater produced in the electrolysis process In the electrolytic treatment step, sterilized seawater having an effective chlorine concentration of 10 mg / L or less is produced, and the produced sterilized seawater is removed in the removal treatment step within a maximum of 1 hour in the removal treatment step. Production method of water for breeding. A production method for producing water for breeding used for growing or growing marine organisms such as marine animals and marine plants. The production method comprises a filtration treatment step for filtration treatment of seawater and a diluted aqueous solution of inorganic salts. Electrolytic treatment step for producing sterilizing water by electrolysis or diaphragm electrolysis, and sterilized seawater for producing sterilized seawater by mixing the sterilizing water produced in the electrolytic treatment step with the seawater filtered in the filtration step And a removal treatment step for removing effective chlorine remaining in the sterilized seawater generated in the sterilized seawater generation step, wherein the sterilized seawater generation step has a sterilization concentration of 10 mg / L or less. A method for producing breeding water, characterized in that seawater is produced and effective chlorine is removed from the produced sanitized seawater within a maximum of 1 hour in the removal treatment step. A manufacturing apparatus for producing water for breeding used for growing or growing marine organisms such as marine animals and marine plants. The manufacturing apparatus includes a filtration processing apparatus for filtering seawater, and a non-diaphragm for the filtered seawater. A diaphragm-type or diaphragm-type electrolyzer that generates sterilized seawater by electrolysis or diaphragm electrolysis, and a removal treatment device that removes effective chlorine remaining in the sterilized seawater generated by the electrolyzer The electrolyzer produces sterilized seawater having an effective chlorine concentration of 10 mg / L or less, and the produced sterilized seawater is removed from the produced sterilized seawater within a maximum of 1 hour by the removal treatment apparatus. Manufacturing equipment. A manufacturing apparatus for producing water for breeding used for growing or growing marine organisms such as marine animals and marine plants. The manufacturing apparatus includes a filtration apparatus for filtering seawater and a diluted aqueous solution of inorganic salts. Sterilization by mixing electrolysis or diaphragm electrolysis with a diaphragm-type or diaphragm-type electrolysis apparatus that produces sterilization water, and the sterilization water produced by the electrolysis apparatus with the seawater filtered in the filtration process A sterilized seawater generating means for generating seawater, and a removal treatment device for removing effective chlorine remaining in the sterilized seawater generated by the sterilized seawater generating means, wherein the effective chlorine concentration in the sterilized seawater generating apparatus is An apparatus for producing breeding water, wherein 10 mg / L or less of sterilized seawater is generated, and effective chlorine is removed from the generated sterilized seawater within a maximum of 1 hour by the removal treatment apparatus.

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