JP2009060872A - Method for treating water for breeding, device for treating water for breeding and system for breeding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for treating water for breeding, a device for treating the water for breeding and a system for breeding, capable of further small-sizing and simplifying equipment. <P>SOLUTION: This method for treating the water for breeding is for treating water for breeding 1, by removing suspended materials and also nitration-treating the water by aerobic microorganisms and is provided by pulling in the water for rearing 1, made to flow into a biological filtering vessel 2 that houses these microorganisms, into a foam separation device 3 for removing the suspended materials 4 by a foam-separating treatment and for improving the amount of dissolved oxygen, and then returning it to the biological filtering vessel 2 for accelerating the nitrating action by the aerobic microorganisms. Also, the device for treating the water for breeding is provided with the biological filtering vessel 2 for holding the aerobic microorganisms, by a filtering material 6 forming gaps 8 for passing the suspended materials 4 contained in the water for breeding 1 and nitration-treating the flowing-in water for breeding 1 by the microorganisms; and the foam separation device 3 for drawing-in the water for breeding 1 from the biological filtering vessel 2, removing the suspended materials by aeration from an aerator 9, and improving the amount of the dissolved oxygen and returning the water to the biological filtering vessel 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a breeding water treatment method, a breeding water treatment apparatus, and a breeding system, and more particularly, to a breeding water treatment method and treatment apparatus suitable for breeding fish and sea animals, and a breeding system such as fish and sea animals. Is.

  As a breeding water treatment method in which breeding water is treated for removing suspended matter and nitrified with aerobic microorganisms, the method described in Patent Document 1 has been known. In this conventional example, the water in the breeding aquarium where the fish and shellfish are bred is clarified by circulating through a closed circulation path that returns from the breeding tank to the breeding tank through the sedimentation tank, foam separation tank, and nitrification tank in order. Is done.

  In the settling tank, breeding water is retained in the tank for a certain period of time to precipitate residual bait, feces, etc. in the water and separate from the water. In addition, the foam separation tank separates the organic substance from the water as a foam by aeration to attach a floating substance to the bubble surface or promote foaming of the soluble organic substance by foaming. Further, the nitrification tank decomposes ammonia in water by the nitrification action of aerobic nitrifying bacteria as microorganisms attached to the particulate filter medium filled in the nitrification tank.

Moreover, from each tank such as the settling tank, in addition to the above-described circulation path, a take-out path for taking out sludge generated along with the purification treatment in each tank together with water to the solid-liquid separation means is provided, The water separated from the sludge by this solid-liquid separation means is returned to the sedimentation tank by the return path, and the reduction of the water accompanying the purification treatment is prevented. For example, a water amount of about 1/2 to 1/10 of the amount of water flowing through the circulation path is taken out by the solid-liquid separation means.
JP 2002-223667 A

  However, the above conventional example has a drawback that the equipment for the treatment of breeding water becomes larger or complicated.

  In other words, the nitrification treatment using an aerobic microorganism such as the nitrification tank in the above conventional example generally has a problem that the equipment, that is, the nitrification tank is enlarged because the treatment efficiency is not so good. Such low treatment efficiency is largely caused by inactivation of microorganisms due to insufficient oxygen supply. For this reason, conventionally, for example, a stirrer or the like is separately installed in the tank, and the breeding water flowing on the surface of the filter medium is used. Although measures such as increasing the flow rate of oxygen to improve the supply of oxygen to microorganisms may be taken, in this case, a new problem arises that the installation of the stirring device makes the facility more complicated .

  The present invention has been made to solve the above drawbacks, and an object of the present invention is to provide a breeding water treatment method, a breeding water treatment apparatus, and a breeding system capable of further downsizing and simplifying equipment.

According to the present invention, the object is
A breeding water treatment method in which the breeding water 1 is subjected to a suspension removal treatment and nitrified with an aerobic microorganism,
The breeding water 1 that has flowed into the biological filtration tank 2 containing the microorganisms is drawn into the foam separation device 3, and the suspension 4 is removed by foam separation treatment and the amount of dissolved oxygen is increased. This is achieved by providing a breeding water treatment method that promotes the nitrification action of aerobic microorganisms.

  According to the present invention, the breeding water 1 that has flowed into the biological filtration tank 2 is drawn into the foam separation device 3 and subjected to foam separation, and then returned to the biological filtration tank 2 again. The generation of foam in the foam separation process, that is, the supply of air into the breeding water 1 increases the amount of dissolved oxygen simultaneously with the removal of the suspension 4, and the breeding water 1 via the foam separation process enters the biological filtration tank 2. By returning, the amount of dissolved oxygen in the breeding water 1 in the biological filtration tank 2 can be increased, and the treatment efficiency of aerobic microorganisms can be improved.

  Circulation of the breeding water 1 between the biological filtration tank 2 and the foam separation apparatus 3 introduces the whole amount of the breeding water 1 in the biological filtration tank 2 into the foam separation apparatus 3 as it is, and the breeding water 1 after the foam separation process It is possible to return the whole amount to the biological filtration tank 2 as it is, that is, the biological filtration tank 2 and the foam separation device 3 can be treated by passing the breeding water 1 only once. If the difference in processing time required for each separation process is used, an appropriate amount of a part of the total amount of the breeding water 1 in the biological filtration tank 2 is sequentially drawn into the foam separation device 3, and compared with the biological filtration process. It is also possible to increase the number of times of the foam separation process and cause the foam separation process to be performed on substantially the entire amount. In this case, the foam separation device 3 can be further downsized, and the foam separation process Repeatedly increase the amount of dissolved oxygen It can be. The number of treatments can be appropriately determined by experiment in consideration of the water quality to be purified.

  In addition, when the breeding water 1 is circulated through the biological filtration tank 2 as in the above-described conventional example, the amount of water introduced into the biological filtration tank 2 is increased by the amount of water returned from the foam separation device 3, thereby the biological filtration tank 2. The flow rate inside can be increased to increase the chance of oxygen supply to the microorganism.

  Therefore, according to the present invention, by increasing the oxygen supply amount, it is possible to improve the nitrification efficiency by aerobic microorganisms during the biological filtration process, maintain the water purification performance, and further reduce the size of the biological filtration tank 2. Can be simplified. Moreover, in the case where the breeding water 1 is circulated as described above, if the increase in the amount of treated water is limited to the biological filtration process, the size of other equipment such as for the foam separation process is not increased.

  If highly efficient breeding water 1 is purified by such a closed-circulation breeding water treatment using the breeding water treatment method, a large amount of food is given for breeding sea animals in an aquarium, as well as for early growth. The quality of the breeding water 1 is simpler and better even if it is reared by cultured fish such as residual food due to the occurrence of such a thing, or feces and urine excreted in large quantities due to such large intake of food. Can be maintained. In addition, by maintaining good water quality, the possibility of contamination by pathogenic bacteria due to replenishment of new water can be reduced and stable breeding and aquaculture can be performed. Furthermore, in the fallow season of aquaculture, if the breeding water 1 is circulated only between the biofiltration process and the foam separation process, the microorganisms can be maintained with good cost savings. Furthermore, in the unlikely event that a disease occurs, ozone can be supplied to the breeding water 1 in place of air using a foam separation treatment facility and sterilized.

In addition, the above breeding water treatment
A biological filtration tank 2 for holding aerobic microorganisms by a filter medium 6 that forms a gap 8 through which a suspension 4 contained in the breeding water 1 passes, and nitrifying the fed breeding water 1 with microorganisms;
A breeding water treatment apparatus having a foam separation device 3 that draws the breeding water 1 from the biological filtration tank 2 and removes suspended matter by aeration from an aerator 9 and returns the amount of dissolved oxygen to the biological filtration tank 2. Can be used.

  The biological filtration tank 2 has a gap 8 through which the suspension 4 passes so as to prevent the suspension 4 from accumulating due to the inflow of the breeding water 1 before the suspension 4 is removed. The filter medium 6 to be formed holds microorganisms having a nitrifying action. In order to form the gap 8 through which the suspension 4 passes, for example, when the filter medium 6 is composed of a large number of granular materials, it is sufficient to adjust the particle size and shape of the granular materials. Can be appropriately determined by experiment in consideration of the size of the suspension 4 contained in the breeding water 1, that is, the size of feces of aquatic organisms to be reared.

  In addition, for introducing the breeding water 1 from the biological filtration tank 2 to the foam separation device 3, it is possible to use a water flow caused by the rising of the foam 7 generated by the aerator 9 of the foam separation device 3. In this way, if the so-called air lift system is used in which the aerator 9 functions not only as the generation of the foam 7 but also as a pump for generating a water flow, independent power for introducing the breeding water 1 into the foam separation device 3 is obtained. Since it is not necessary, the equipment can be further simplified.

  In this case, the water flow generated by the aerator 9 is configured as the above-described closed-circulation type water treatment and is discharged from the discharge port 5 of the biological filtration tank 2, that is, stronger than the water flow flowing out to the circulation water channel 13 connected to the breeding water tank 14. If set and the amount of water introduced into the foam separator 3 is made larger than the amount of water discharged from the outlet 5, the suspension 4 can be well removed from the breeding water 1 and closed and circulated.

  As is clear from the above description, according to the present invention, the equipment required for the treatment of breeding water can be further reduced in size and simplified, and the quality of the breeding water can be maintained well at a reduced cost. . Moreover, by maintaining good water quality, it is possible to reduce the risk of contamination with pathogenic bacteria due to supplementation of breeding water that is treated in a closed circulation manner, and breed well.

  1 and 2 show an embodiment of the present invention. In this embodiment, a breeding system is constructed for the purpose of cultivating fish such as Thailand, flounder, and puffer fish. In order to purify the breeding water 1 in the breeding tank 14 for breeding fish, the breeding tank 14 is circulated. A water treatment device using the water channel 13, that is, a treatment device for the closed circulation breeding water 1 is connected.

  The treatment device for the breeding water 1 includes a biological filtration tank 2, a suspension removing device (foam separation device 3), a temperature control device 20, and a sterilization device 21, and the breeding water 1 in the breeding water tank 14. The breeding water 1 in the breeding aquarium 14 is maintained in a purified state by constantly replacing an appropriate amount with the purified treated water that has been treated via these through the circulation water channel 13.

  The biological filtration tank 2 is used for nitrification treatment, that is, a treatment that mainly oxidizes highly toxic ammonia excreted in the breeding water 1 by a microorganism (nitrification microorganism) into nitrous acid and nitric acid. The filter medium 6 composed of a large number of granular materials to which aerobic microorganisms having a nitrifying action adhere is accommodated in the tank 2. As shown in FIG. 2, the filter medium 6 is appropriately held or regulated by a mesh-sized net 22 to prevent outflow from the biological filtration tank 2, and supply of oxygen dissolved in the breeding water 1 by passing the breeding water 1 Nitrification is performed by the microorganisms that have undergone the treatment.

  In addition, the suspension removing device 3 supplies air that generates fine foam 7 in the breeding water 1 by the aerator 9, and attaches the suspension 4 floating in the breeding water 1 to the rising foam 7. The foam separation device 3 separates and collects the suspension 4 from the breeding water 1 as a scum together with the foam 7 floating on the water surface. In this embodiment, the hollow inside the device 3 is generated by the water flow generated by aeration by the aerator 9. A so-called air lift type foam separation device 3 that introduces breeding water 1 to be treated water into the section 23 and discharges the breeding water 1 as treated water from the hollow section 23, that is, generates a circulating water flow by aeration. used. As shown in FIG. 2, in order to circulate by an air lift, a water intake section 12 for introducing the breeding water 1 is introduced at the bottom of the hollow section 23 adjacent to the air diffuser section 8 a of the aerator 9, and the apparatus 3 is raised at the top. A drainage unit 11 for discharging the water 1 is provided, and an opening 3a that is constricted in a funnel shape is provided in the ceiling of the device 3 so that the foam 7 attached with the suspension 4 in the breeding water 1 is likely to overflow. It is done. The bubbles 7 overflowing from the opening 3a due to the suspension 4 are accumulated in the disposal tank 24, and then disposed of by appropriate solid-liquid separation.

  The temperature control device 20 controls the temperature of the breeding water 1 in the breeding aquarium 14. The breeding water 1 is passed through a tube heated and cooled by a boiler or a freezer according to a control mechanism (not shown), The breeding water 1 is controlled to a water temperature suitable for the fish to be reared. In addition, the sterilizer 21 irradiates the introduced breeding water 1 with ultraviolet rays and sterilizes viruses, E. coli, and the like.

  As shown in FIG. 1, the circulation water channel 13 of the breeding water treatment apparatus described above has a circulation path from the breeding water tank 14 to the breeding water tank 14 through the biological filtration tank 2, the temperature control device 20, and the sterilization device 21 in order. Form. On the circulation path, on the circulation water path 13 where the water supply pump 25 connects the biological filtration tank 2 and the temperature control device 20 so that the flow velocity and flow rate flowing from the biological filtration tank 2 to the circulation water path 13 can be easily adjusted. Thus, the breeding water 1 is caused to flow through the circulation path at a substantially constant flow rate. The withdrawal of the breeding water 1 from the breeding aquarium 14 is performed, for example, from the bottom of the breeding aquarium 14 so that sedimented feces and the like can be easily taken in.

  Moreover, the foam separation apparatus 3 to which the circulating water channel 13 described above is not directly connected performs suspension removal processing on the breeding water 1 by exchanging the breeding water 1 with the biological filtration tank 2. As shown in FIG. 2, the biological filtration tank 2 described above is provided with an inlet 10 and an outlet 5 so as to form a flow path sandwiching the filter medium 6, and flows from the breeding water tank 14 through the circulation water channel 13. The raised breeding water 1 passes through the filter medium 6 in the process of flowing into the biological filtration tank 2 from the inlet 10 and discharging from the outlet 5.

  In this embodiment in which the upward opening portion of the biological filtration tank 2 is utilized as the inflow port 10, the biological filtration tank 2 has a vertical partition 26 that communicates the bottom and partitions the biological filtration tank 2 into two compartments. The upper opening of one of the wider compartments partitioned by the partition 26 functions as the inflow port 10, and the discharge port 5 described above is formed in the upper part of the other compartment. In consideration of the inflow of the breeding water 1 before the suspension removal process by the foam separation device 3, the filter medium 6 is composed of a large number of granular materials having a size that forms a gap 8 through which the suspension 4 in the breeding water 1 can pass. Then, it is arranged so as to block the inside of the one section in the horizontal direction, is supported by the net 22, and is held at the intermediate portion in the height direction of the biological filtration tank 2. As a result, when the breeding water 1 flows into one section of the biological filtration tank 2 from above, the breeding water 1 moves downward through the filter medium 6, moves over the partition 26 to the other section side, and this time. It moves upward and is discharged from the discharge port 5.

  The foam separation device 3 for exchanging the biological filtration tank 2 and the breeding water 1 described above has the intake part 12 below the filter medium 6, that is, the breeding water 1 that has already passed through the filter medium 6 from the biological filtration tank 2 to the bottom of the hollow part 23. In the hollow portion 23, foam separation is performed, and then the drainage portion 11 is added to the breeding water 1 before being passed through the filter medium 6 by flowing into the biological filtration tank 2 from above the filter medium 6, that is, from the inlet 10. In this way, the treated water is returned to the biological filtration tank 2. The hollow part 23 is formed in a substantially cylindrical shape with a bottom, and the water intake part 12 extends substantially horizontally, and is a hollow part of the foam separation device 3 adjacent to the low position of the biological filtration tank 2 and the diffuser part 8a of the aerator 9. The drainage part 11 extends substantially horizontally and connects the high position of the biological filtration tank 2 and the high position of the hollow part 23 of the foam separation device 3.

  Moreover, in this embodiment using the small thing with a low processing capability compared with the biological filtration process by the biological filtration tank 2 mentioned above as the said foam separation apparatus 3, the difference of each processing time of a biological filtration process and a foam separation process In consideration of the above, the water supply forces of the air lift by the pump 25 and the aerator 9 described above are appropriately adjusted. That is, for the breeding water 1 returned from the biological filtration tank 2 through the discharge port 5 to the breeding tank 14, in order to improve the water quality and increase the amount of dissolved oxygen compared to the case where the foam separation process is performed once, It is sufficient that the amount of water per unit time drawn into the foam separation device 3 by the water intake unit 12 is larger than the amount of water per unit time passing through the outlet 5. In this embodiment, the processing capacity is relatively lower than that of the biological filtration tank 2 and the processing time is shorter than that of the foam separation device 3 being discharged from the outlet 5 of the biological filtration tank 2 by the water intake unit 12. By pulling the breeding water 1 at a flow rate, the amount of water that is subjected to foam separation treatment is increased from the amount of water that is subjected to biological filtration treatment per unit time, and the breeding water that returns from the biological filtration tank 2 to the breeding tank 14 through the discharge port 5. A substantially sufficient foam separation process for 1 is ensured.

  Therefore, the breeding water treatment apparatus includes a main circulation system 27 that circulates the breeding water 1 between the breeding water tank 14 and the biological filtration tank 2 and the like, and a foam separation device 3 for the biological filtration tank 2 in the main circulation system 27. And a sub-circulation system 28 for circulating the breeding water 1 between them, and the suspension-removing process step is performed simultaneously with the biological filtration process step on the breeding water 1 circulating through the main circulation system 27 by the sub-circulation system 28. The contaminated breeding water 1 is always taken in from the breeding water tank 14, and at the same time, the purified breeding water 1 is continuously supplied. The subcirculation system 28 is set to have a higher circulation flow velocity and flow rate than the main circulation system 27, and the filtration target water to be biologically filtered is dissolved oxygen by the foam-separated water circulating through the subcirculation system 28. As the amount is increased, the flow rate is increased, and the content of the suspension 4 is reduced, thereby increasing the amount of oxygen supplied to the microorganisms adhering to the filter medium 6 and increasing the nitrification efficiency.

  In the above, the breeding water 1 is directly introduced into the biological filtration tank 2 without removing the suspension 4 from the breeding tank 14 and suspended in the breeding water 1 by the foam separation device 3 via the biological filtration tank 2. Although the case where the thing removal process is performed has been shown, if the breeding water 1 is retained, for example, the breeding water 1 is introduced into the biological filtration tank 2 via the foam separation device 3, and the biological filtration tank 2 and the foam separation are performed. It is also possible to circulate from the foam separator 3 after repeating the exchange of the breeding water 1 with the device 3. Moreover, when exchanging the breeding water 1 before passing through the filtering medium 6 in the biological filtration tank 2 or before passing through the filtering medium 6 with the foam separating apparatus 3, a water intake section 12 and a drain section of the foam separating apparatus 3 are used. In addition to directly taking water from and draining the biological filtration tank 2 by 11, for example, it is possible to connect the water intake part 12 and the drainage part 11 to the circulation channel 13 upstream and downstream of the biological filtration tank 2.

It is a flowchart which shows the processing procedure of breeding water. It is a figure which shows the flow of a biofiltration process and a foam separation process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Breeding water 2 Biological filtration tank 3 Foam separator 4 Suspension 5 Outlet 6 Filter medium 7 Foam 8 Gap 9 Aerator 10 Inlet 11 Drainage part 12 Water intake part 13 Circulation channel 14 Breeding tank 14

Claims (5)

It is a breeding water treatment method in which breeding water is treated for removing suspended matter and nitrified by aerobic microorganisms,
The breeding water that has flowed into the biological filtration tank containing the microorganisms is drawn into a foam separation device, the suspension is removed by foam separation treatment and the dissolved oxygen amount is increased, and then returned to the biological filtration tank to return to the aerobic A breeding water treatment method for promoting nitrification of microorganisms. The nitrification treatment is performed by passing the breeding water that is introduced and returned from the foam separation device through a filter medium to which microorganisms adhere on the way to discharge from the discharge port formed in the biological filtration tank,
In the foam separation process, the generated water causes a stronger water flow than the discharge flow flowing into the discharge port, and the breeding water that has passed through the filter medium of the biological filtration tank is preferentially drawn into the foam separation device compared to the discharge port. The breeding water treatment method according to claim 1, which is performed by: A biological filtration tank that retains aerobic microorganisms by a filter medium that forms a gap through which a suspension contained in the breeding water passes, and nitrifies the fed breeding water with microorganisms;
A breeding water treatment apparatus comprising: a foam separation device that draws breeding water from the biological filtration tank, removes suspended matter by aeration from an aerator, and returns the amount of dissolved oxygen to the biological filtration tank. The biological filtration tank has an inlet through which breeding water flows, and an outlet through which the breeding water that has flowed from the inlet and discharged from the drainage part of the foam separation device and passed through the filter medium to which nitrifying microorganisms adhere is discharged. Formed,
The breeding water treatment apparatus according to claim 3, wherein the foam separation device is formed with a water intake portion that takes in breeding water that has passed through the filter medium of the biological filtration tank by generating a water flow by aeration.   A closed circulation type breeding system comprising a breeding water tank connected to the biological filtration tank of the breeding water treatment apparatus according to claim 3 through a circulation channel and whose quality of the breeding water stored by the circulation treatment is purified and managed.

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