JP2000157100A - Device for treating water for producing and breeding fry of fishes or the like and method for treating water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for treating water, capable of largely reducing periodic water exchange operations carried out for decreasing the concentration of nitrate-based nitrogen in a fish fry-producing field, an aquarium, etc., enabling the reutilization of culture water, not necessitating a work for inversely washing a filtration device, capable of reducing the amount of used raw water, and capable of improving the quality of the water. SOLUTION: A contact type trickling filter 12 and a hypochlorite-injecting device 16 are disposed in a route for purifying water circulated in plural water tanks 10. The water is used for producing or breeding fish fries. The water used for producing or breeding the fish fries is circulated in the trickling filter 12 to contact-treat contaminants, and then treated with chlorine in the hypochlorite-injecting device 16. Nitrate-based nitrogen is reduced into nitrogen gas by the oxidation power of the hypochlorite, and the concentration of the nitrate-based nitrogen is maintained at a low level near to that of fresh sea water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment apparatus and a water treatment method for circulating and purifying water for producing or raising seeds in a seedling production site for fish and the like, a fish farm, a cultivation site, an aquarium, and the like.

[0002]

2. Description of the Related Art Generally, when producing and raising fish and the like,
Nitrogen contained in the feed is excreted from the bred organisms in the form of ammonia or the like and remains, and is converted into nitrite by nitrifying bacteria, and is made harmless as nitric acid. However, if the concentration of nitric acid is high, it is dangerous for breeding organisms. Therefore, it is necessary to add and dilute fresh water, and a large tank requires a large amount of raw water.

Conventionally, a breeding aquarium for larvae and larvae for producing fish seedlings is constructed as shown in FIG. 3, in which natural water at the site is supplied from a water source (natural seawater tank) 46 to a water supply pump 47.
And raised into the breeding aquarium 41,
The water overflowing from 1 is left as it is in a water channel (drainage water storage tank) 48
Water was not reused.

A breeding aquarium such as a parent fish tank or an aquarium is constructed as shown in FIG. 4. Water in a breeding aquarium 51 is guided to a filtration device 59 by a circulation pump 52 and is bred after being filtered. The circulation filtration method of returning to the water tank 51 is employed. Fresh water is pumped from a new water source (natural seawater tank) 56 by a water supply pump 57 and replenished into the breeding aquarium 51 in order to compensate for the amount of water that decreases during circulation.

[0005] In the filtration device 59, at the same time as the suspended substances in the water are removed, highly toxic ammonia nitrogen dissolved in the water is removed by the action of microorganisms attached to the surface of sand or the like in the filtration device. Via nitrous acid, it is oxidized to less toxic nitrate nitrogen. This action of the microorganisms has the effect of reducing the toxicity of ammonia and reducing the amount of fresh water used. However, since the function of the filter device 59 gradually decreases due to accumulation of loads such as pollution,
It is necessary to wash the inside of the filtration device 59 by backflowing the water pumped from the backwash water tank 61 by the backwash pump 62. The wastewater after backwashing is stored in a wastewater storage tank 58.

Japanese Patent Application Laid-Open No. 10-178966 discloses a "water treatment apparatus for breeding fish and the like", which includes a contact (or filtration) apparatus for a ceramic material having a far-infrared radiation capability in a water purification path, adsorption of activated carbon, and membrane filtration treatment. A device has been proposed in which ammonia nitrogen is changed from nitrite nitrogen, which has low toxicity, to nitrate nitrogen. JP-A-10-22
No. 5244, "Fisher water purification device for fish farming", includes a water spray device for treated water disposed above the filter medium, a discharge device for treated water disposed below the filter medium, and a discharge device for removing sediment residue. There has been proposed a sewage purification device for fish farming that includes a treatment tank and a component adjusting tank for reducing nitrate ions.

[0007]

The conventional circulating filtration method has the following problems in that highly toxic ammonia is oxidized to relatively less toxic nitric acid. (1) Aquarium water is oxidized and needs to be neutralized. (2) It must be diluted before nitrate nitrogen accumulates and gives toxic effects to fish, and it cannot be used at all for larvae that are particularly sensitive to nitrate nitrogen. (3) In the production of seeds and seedlings, especially the rearing of larvae and larvae, the pollution load due to growth and feeding increases drastically, making it difficult to follow up with the conventional method. (4) In the circulating filtration method, the function decreases due to accumulation of loads such as pollution It is necessary to periodically wash (backwash) the filtration tank with backflow water to prevent

[0008]

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides, in one aspect, a water treatment for producing or raising seedlings at a seedling production site for fish and the like, a fish farm, a cultivation site, an aquarium, and the like. A device for producing and breeding an aquarium containing fishes and the like, a purification breeding water circulating through the aquarium, a purification path, and a contact-type sprinkling filter placed in the purification path, A hypochlorous acid injecting device disposed in the purification path, and circulating production breeding water through the sprinkling filter bed to contact-treat the polluted substances, and to the production breeding water by the hypochlorous acid injecting device. A water treatment apparatus characterized by performing chlorination by injecting chlorous acid.

The sprinkling filter bed of the present invention is obtained by stacking a filter medium of rock or a porous material in the filter bed. The filter medium is sprinkled with breeding water to contact pollutants and absorb light to absorb the light. It is desirable that algae be grown on the surface and denitrification be performed.

[0010] As a hypochlorous acid injection device, seawater is introduced into a hyposubgeneration device and electrolyzed to produce available chlorine (sodium hypochlorite), and the sodium hypochlorite-containing seawater is converted into a seawater line. To be injected into the device.

[0011]

In the water treatment apparatus for production and breeding of fish and the like according to the present invention, water is withdrawn from aquariums of fish and other seedling production plants, fish farms, aquariums, and the like, and polluted substances contained in the water are filtered through a porous filter bed. It leads to the filter bed and physically precipitates and adsorbs it.At the same time, it decomposes and absorbs by the organisms that grew on the surface of the filter bed, and reduces and absorbs it by the organisms that grew deep in the filter bed. There is a feature in performing such operations. Furthermore, by the oxidizing power of hypochlorous acid injected by the hypochlorous acid injection device, the nitrate nitrogen, which is the above problem, is reduced to nitrogen gas or absorbed into the living organism, thereby reducing the nitrate nitrogen concentration to a low level. Can be maintained.

[0012] As a result, in breeding parent fish at a seedling production plant or in an aquarium, it is not only possible to drastically reduce the regular replacement of water for lowering the concentration of nitrate nitrogen, but it is impossible to reuse breeding water in the past. It is now possible to reuse breeding water for rearing larvae at the seedling production plant. Further, since a sprinkling filter bed is used in place of the filtration device, the backwashing operation of the filtration device becomes unnecessary.

The present invention, in another aspect, is a water treatment method for producing or rearing seeds at a seedling production site for fish and the like, a fish farm, a cultivation site, an aquarium, etc., wherein the method circulates between a plurality of water tanks. A contact-type sprinkling filter and a hypochlorous acid injecting device are arranged in the purification route of the production breeding water, and the cultivation breeding water is circulated through the sprinkling filter to contact-treat the polluted substances and the hypochlorous acid. A water treatment method characterized in that hypochlorite is injected into production and breeding water by an injection device to perform chlorination.

According to the water treatment method, the same operation and effect as those of the above-described water treatment apparatus according to the present invention can be achieved. Hereinafter, the present invention will be described in detail with reference to embodiments of the accompanying drawings.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a water treatment apparatus according to a preferred embodiment of the present invention. Water contaminated by fish and the like in a production and breeding aquarium 10 used for producing or raising fish or the like. The water overflows from the water tank 10 or is withdrawn from the bottom, passes through the sprinkling filter bed 12, and is stored in the water storage tank 14 also serving as a hypochlorous acid reaction tank.

The sprinkling filter bed 12 has a structure in which rock (for example, pumice) or a filter material 13 of a porous material is densely stacked in the filter bed. The stacking height is preferably 1.5 m or more, and it is necessary that the material does not collapse when stacked. The stored water is returned to the production and breeding aquarium 10 by the circulation pump 15, but a part of the water is passed through the hypochlorous acid generating and injecting device 16 to the water storage tank 14, where the hypochlorous acid reaction is performed.

The hypochlorous acid generating and injecting device 16 takes in seawater into an electrolytic cell and electrolyzes it to produce available chlorine (sodium hypochlorite), and converts the sodium hypochlorite-containing seawater into a seawater line. It is a device that injects into

The pollutants contained in the water are collected by the sprinkling filter 12
The filter medium physically precipitates, adsorbs, etc., and at the same time, decomposes, absorbs, etc., by the organisms that have grown on the surface of the filter bed. In addition, reduction, absorption, and the like are performed by living organisms that have grown in the deep part of the filter bed. Further, in the hypochlorous acid generating and injecting device 16 and the reaction tank 14, the nitric acid nitrogen is reduced to nitrogen gas or absorbed into the living body by the oxidizing power of hypochlorous acid, and the nitrate nitrogen concentration is maintained at a low level. Will be done.

[0019]

FIG. 4 shows an experimental apparatus prepared for confirming the effects of a water treatment system for producing and raising fish and the like according to the present invention. Hypochlorous acid generation and injection device 26
Used an apparatus having the following specifications. (1) Effective chlorine generation Maximum per day: 3.84 kg (2) Seawater flow Electrolyzer: 100 liter / m (3) Chlorine injection rate Maximum: 0.6 ppm (4) Treatment amount Seawater: 115 m ³ / h

(1) Experimental Method The experimental apparatus shown in FIG. 4 comprises a seedling production tank 20, a circulating pump 21, a sprinkling filter 2
2. Cushion tank (reaction tank / water tank) 24, circulation pump 25, hypochlorous acid generation and injection device 26, physical filter 2
7. It is composed of an oxidant (oxidizing substance) removing device 28, which is connected by piping as shown in the figure. The production and breeding water sent to the cushion tank 24 after passing through the sprinkling filter bed 22 is pumped up by the circulation pump 25 and sent to the hypochlorous acid generation and injection device 26.

At this time, a part of the production and breeding water pumped up by the circulation pump 25 is branched and sent to the physical filter 27 under pressure, and is sent to the seed and seedling production water tank 20 via the oxidant removing device 28. Oxidant removal device 28
Is provided to keep the residual oxidant concentration low when performing chlorination by seawater electrolysis when growing fry, but it can be omitted for adult fish.

In the experiment, after the watering filter has been sufficiently aged in advance, fry larvae are placed in an aquarium 20 for producing seeds and seedlings having a water volume of 10 m ³ , and bred under normal breeding conditions. The data in the aquarium for seedling production, the data in the sprinkler filter, and the data of fresh seawater for comparison were compared with water temperature, dissolved oxygen (DO), hydrogen ion concentration (pH), ammonia, nitrite, Measurements were made for nitric acid, chromaticity, turbidity, residual chlorine concentration, and general bacterial count.

(2) Experimental period The experimental apparatus was used in January 1997.
The operation was carried out for ripening from February, and experiments were carried out on juvenile Hosoi flounder from February 8 to April 18, 1998. (3) Experimental results Table 1 shows the analysis results of the water quality measured on April 7, 1998, and Table 2 shows the analysis results of the water quality measured on April 14, 1998.

[Table 1]

[Table 2]

In these tables, the nitric acid concentration was 0.1 mg or less per liter even after 39 days to 45 days from the release of the shrimp, and was comparable to that of fresh seawater measured for comparison. . Thus, experiments have shown that according to the system of the present invention, the amount of raw water used for breeding organisms is greatly reduced, and the breeding environment (water quality) is improved.

[0025]

As described in detail above, according to the water treatment apparatus and the water treatment method of the present invention, the breeding of parent fish at a seedling production plant and the aquarium, etc., require a periodic method for reducing the concentration of nitrate nitrogen. Not only can the water replacement be significantly reduced, but it is also possible to reuse breeding water for rearing larvae in seedling production facilities, where it was impossible to reuse breeding water in the past. In addition, since a sprinkling filter bed is used in place of the filtration device, the technical effect is extremely remarkable, such that the backwashing operation of the filtration device becomes unnecessary.

[Brief description of the drawings]

FIG. 1 is a schematic vertical sectional view showing a preferred example of a water treatment system of the present invention.

FIG. 2 is a schematic vertical sectional view showing an experimental apparatus of the water treatment system of the present invention.

FIG. 3 is a schematic longitudinal sectional view of a conventional discharge type water treatment apparatus.

FIG. 4 is a schematic longitudinal sectional view of a conventional circulating water treatment apparatus.

[Explanation of symbols]

 10,20 Production and rearing water tank 12,22 Watering filter bed 13 Filter medium 14,24 Water storage tank 15,25 Circulation pump 16,26 Hypochlorous acid generation and injection device

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[Procedure amendment]

[Submission date] October 29, 1999 (1999.10.
29)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides, in one aspect, a water treatment for producing or raising seedlings at a seedling production site for fish and the like, a fish farm, a cultivation site, an aquarium, and the like. A device for producing and breeding an aquarium containing fishes and the like, a purification breeding water circulating through the aquarium, a purification path, and a contact-type sprinkling filter placed in the purification path, And a hypochlorous acid injection device disposed in a purification path, wherein the sprinkling filter bed is rock or porous in the filter bed.
Of filter materials made of high quality materials, produced and reared on the filter media
Sprinkles water to treat pollutants and absorbs light
So that the algae thrive on the surface of the filter medium and denitrify
The hypochlorous acid is injected into the production and breeding water by the hypochlorous acid injection device to perform chlorination.
The present invention provides a water treatment apparatus characterized in that:

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

The sprinkling filter bed of the present invention is obtained by stacking a filter medium of rock or a porous material in the filter bed. The filter medium is sprinkled with breeding water to contact pollutants and absorb light to absorb the light. Algae flourishes on the surface and denitrification is performed .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

The present invention, in another aspect, is a water treatment method for producing or rearing seeds at a seedling production site for fish and the like, a fish farm, a cultivation site, an aquarium, etc., wherein the method circulates between a plurality of water tanks. A contact type sprinkling filter and a hypochlorous acid injecting device are arranged in the purification route of the production breeding water, and the sprinkling filter is placed in the filter.
It is a pile of rock or porous material filter media.
Sprinkling production breeding water on the wood and contact-treating pollutants
To absorb the light to increase the growth of algae on the surface of the filter medium and denitrification
Water treatment method , wherein hypochlorite is injected into production and breeding water by the hypochlorous acid injection device to perform chlorination.

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 598169952 Shigeru Takeda 674-2 Maeda Nishimachi, Takamatsu City, Kagawa Prefecture (72) Inventor Koichi Yano 2-4 Yotsuya, Shinjuku-ku, Tokyo Inside Shinryo Corporation (72) Inventor Kazuhiro Otsuka 2-4 Yotsuya, Shinjuku-ku, Tokyo Shinryo Corporation 1921-1, Nishimachi (72) Inventor Shigeru Takeda 674-2, Maeda Nishimachi, Takamatsu City, Kagawa Prefecture F-term (reference) 2B104 CA01 CB12 EA01 ED02 ED05 ED12 ED26 ED36 EF01 EF09 4D003 AA02 BA02 CA02 EA01 EA19 EA23 FA06

Claims (5)

[Claims] Claims 1. A seedling production site for fish and the like, a fish farm, a cultivation site,
In a water treatment device for producing or raising seedlings in an aquarium or the like, a water tank for production and breeding that houses fish and the like, a purification path for production and breeding water circulated through the water tank, and disposed in the purification path. And a hypochlorous acid injecting device arranged in the purification path, and circulates production and breeding water through the trickling filter to contact and treat pollutants. A water treatment apparatus characterized in that hypochlorous acid is injected into production breeding water by a chlorite injection apparatus to perform chlorination. 2. The sprinkling filter bed is formed by stacking a filter medium of rock or a porous material in the filter bed. The filter medium is sprinkled with breeding water to contact treatment of pollutants, and absorbs light to absorb light. The water treatment apparatus according to claim 1, wherein the algae are prosperous and denitrification is performed. 3. A seedling production site for fish and the like, a fish farm, a cultivation site,
In a water treatment method for producing or raising seedlings in aquariums, etc., a contact-type sprinkling filter and a hypochlorous acid injection device are arranged in the purification path of production and breeding water that circulates between multiple tanks. The water is circulated through the trickling filter to contact the polluted substances, and the hypochlorous acid is injected into the production breeding water by the hypochlorous acid injection device to perform chlorination. Processing method. 4. The water treatment method according to claim 3, wherein light is absorbed by the trickling filter bed, and algae grow on the surface of the trickling filter bed to perform denitrification. 5. After the contact treatment in the sprinkling filter bed and the chlorination with hypochlorous acid, the pollutants generated in the breeding water are physically and chemically removed by filtration, activated carbon adsorption, catalytic treatment and the like. The water treatment method according to claim 3, wherein the water is removed biologically.