JP2000279991A - Denitrification/reduction type water cleaning treatment system using facultative anaerobic bacteria - Google Patents

Abstract

PROBLEM TO BE SOLVED: To iprovide a denitrification/reduction type wastewater cleaning treatment system using facultative anaerobic bacteria, which is capable of decomposing, denitrifying and reducing nitrates in a short time exerting a harmful influence on the breeding of organisms such as aquarium tropical fishes, fishes or edible shellfishes for good. SOLUTION: In this system, an aerobic recycle water stream passage of water to be subjected to reduction treatment with an aerobic filter using aerobic bacteria and an anaerobic recycle water stream passage of water to be subjected to reduction treatment with a closed type anaerobic filter 10 using anaerobic bacteria, are formed into two separate routes. Nitrates caused within the aerobic recycle water stream passage, are infiltrated through powdery sand 5 into the anaerobic recycle water stream passage to decompose nitrates within this anaerobic recycle water stream passage. Gaseous nitrogen in the anaerobic recycle water stream passage, which is generated when the nitrates are decomposed, is discharged in such an isolated state that the gaseous nitrogen is not brought into contact with water within the aerobic recycle water stream passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ornamental fish used for breeding aquatic organisms such as tropical fish, freshwater fish, saltwater fish, invertebrate organisms, turtles, etc., which are mainly ornamental fish, and for edible purposes. The present invention relates to a system for purifying denitrified reduced water by facultative anaerobic bacteria used in breeding moss for fish and shellfish.

[0002]

2. Description of the Related Art Conventionally, as an anaerobic water purification system of this type, for example, as disclosed in Japanese Patent Publication No. 2665789, the volume of water to be treated and A thick partition containing a main reaction space made of a porous or fibrous material is formed between the volume of the enclosed water and a means for maintaining a concentration gradient of various dissolved substances in this space, A technique for diffusing and purifying microorganisms has been proposed. Further, conventionally, a partition plate having a large number of water holes is provided in a sealed casing that does not transmit light, and a component for growing anaerobic bacteria in one chamber partitioned by the partition plate is included. Filling a bait ball, which is a spherical filter, and attaching pipes so that water circulates in each chamber partitioned by a partition plate, suppresses the increase in nitrate contained in water in the water tank,
Techniques for reducing the number of water changes have been proposed.

[0003]

However, in the prior art, for example, in the system disclosed in Japanese Patent Publication No. 2665789, it takes a considerable amount of time to stabilize by anaerobic bacteria. In addition, since a large amount of sand is put in the water tank, it is aesthetically unsightly. In addition, although it is possible to breed corals and small amounts of fish that do not require much food, it is not suitable for breeding fish and corals that require large amounts of food because they can not catch up with the decomposition process of nitrate that accumulates every day . Therefore, as a result, water was forced to change,
It is difficult to stabilize water quality, and it is also difficult to breed large quantities of fish and the like. In addition, there is a flow type box type device containing a bait ball for anaerobic bacteria in the conventional technology, but it cannot catch up with the decomposition of nitrate accumulated in the water tank every day at a flow speed of drip even though it is a flow type. However, if the flow rate is increased, it is difficult to maintain the oxygen-free water area. Also,
By returning the water filtered in the anaerobic circulation flow path to the aerobic circulation flow path, the nitrogen denitrified and reduced in the anaerobic circulation flow path is returned to the water breeding the aquatic organisms. Ingredients have been shown to inhibit the growth of invertebrates such as corals and shells. In addition, bait balls (organic substances mainly composed of methanol, methyl alcohol, etc.), which are supposed to feed on anaerobic bacteria, dissolve into the breeding water, and as the breeding water becomes cloudy, harmful to breeding organisms and aerobic filtration bacteria. give. In addition, increasing concentrations of ammonia and nitrite can lead to killing of bred organisms.

Accordingly, the present invention has been made in view of the above-mentioned various circumstances, and has a more adverse effect on breeding organisms such as fish and coral than conventional anaerobic water purification treatment systems. Nitrate, which can be decomposed and denitrified efficiently in a short time, separates and discharges nitrogen components from breeding water, and reduces the cost of purification by minimizing the frequency of water exchange. An object of the present invention is to provide a denitrification-reduced water purification treatment system using facultative anaerobic bacteria, which can save the trouble of replacement.

[0005]

In order to achieve the above-mentioned object, according to the present invention, an aerobic circulating flow path of water reduced by a filter using an aerobic bacterium, and an anaerobic bacterium are provided. Sand that separates the anaerobic circulating flow path and the anaerobic circulating water path by forming an anaerobic circulating flow path for water reduced by the used filter in a separate system, or water-permeable and oxygen-impermeable Nitrate generated in the aerobic circulating water flow path penetrates into the anaerobic circulating water flow path via the screen member, and is decomposed in the anaerobic circulating water flow path circulating independently from the aerobic circulating water flow path Is to do.

Further, nitrogen gas generated when nitrate is decomposed in the anaerobic circulation flow path is discharged in a state of being isolated so as not to come into contact with water in the aerobic circulation flow path.

[0007] The anaerobic circulating flow path is connected to the bottom of the aquatic organism breeding aquarium P, the bottom of the water chamber adjacent to the external aerobic filtration tank connected to the aquatic breeding aquarium P, or the aerobic filtration tank. Installed on the bottom side.

Further, a plurality of water holes 2 are formed in the upper plate so as to be shaped like a blade, and one end of each of the holes is connected to the closed anaerobic filter device 10 to form a plurality of holes along the longitudinal direction. A box-shaped anaerobic bottom filter body 1 in which a pair of suction pipes 4 and a pair of shower pipes 4 for suction and discharge are arranged at both inner ends thereof so that the blow-out holes 3 formed so as to face each other is provided in a water tank P for breeding aquatic organisms. A powder-like sand 5 or a water-permeable and oxygen-impermeable screen member is laid on the upper surface of the scalloped upper plate portion of the anaerobic bottom filter body 1 while being disposed on the bottom surface.
The internal water is circulated through the hermetic anaerobic filter device 10 and reduced, and then brought into contact with the powdery sand 5 or the screen member on the upper surface of the saw-like upper plate through the water holes 2. It is to have done.

Then, a plurality of water passage holes 2 are formed in the upper plate portion so as to form a saw-like shape, one end of which is connected to the closed anaerobic filter device 10 at one end, and a plurality of water passage holes 2 are formed along the longitudinal direction. A box-shaped anaerobic bottom filter body 1 in which a pair of suction pipes 4 and a pair of shower pipes 4 for suction and discharge are arranged at both inner ends thereof so that the blow-out holes 3 formed so as to face each other is provided in a water tank P for breeding aquatic organisms. A powdery sand 5 or a water-permeable material is provided on the bottom of the water chamber adjacent to the aerobic filtration tank provided outside or on the bottom side of the aerobic filtration tank, and on the upper surface of the scalloped upper plate of the anaerobic bottom filter body 1. And an oxygen-impermeable screen member is laid, and the water inside the anaerobic bottom filter body 1 is circulated through the hermetic anaerobic filter device 10 for reduction treatment, and then through the water holes 2. Tesu Powder-like sand of this-like upper plate portion top 5
Alternatively, it is in contact with the screen member.

Further, a pair of shower pipes for suction and discharge are connected to each other by connecting one end opening side to a closed type anaerobic filter device 10 so as to face a plurality of ejection holes 3 formed in a longitudinal direction. 4 are disposed at both ends in a lower chamber 62 having an upper surface formed by a punch board, and a middle chamber between the punch board 61 on the upper surface of the lower chamber 62 and the transparent screen 67 disposed above the punch board 61. 66 is filled with powdered sand 5 or a water-permeable and oxygen-impermeable screen member, and an upper chamber 69 between the permeable screen 67 and a punch board 68 disposed above the permeable screen 67. In which a unit type reduction filter box 60 of a filtration tank throw-in type, which is filled with coarse sponge pads or gravel 70, is formed.

Further, the water tank P has an upper aerobic filter 20 disposed at an upper opening thereof, an external aerobic filter disposed outside thereof, and a bottom surface disposed above the anaerobic bottom filter body 1. Aerobic filter,
It can be provided with any of the aerobic filters combined with the wet filtration device disposed on the outside or the back.

Further, the closed anaerobic filter device 1
0 can be formed by integrally filling a bait ball 13 for anaerobic bacteria together with a filter medium 12 for fixing bacteria, integrally with a pump section 11 for forced circulation flowing water.

Further, a flow rate check means 8 can be provided between the flow paths of the closed anaerobic filter device 10 and the anaerobic bottom filter body 1.

Further, the oxygen-free state in the water tank P is constantly inspected and confirmed with a reagent, and the amount of the filter material of the hermetically sealed anaerobic filter device 10 until the permissible value is reached. The anaerobic bottom filter body 1 may be configured to have means for changing the amount of flowing water between the flowing water path and the anaerobic bottom filter body 1.

In the anaerobic water purification treatment system for breeding aqueous organisms according to the present invention configured as described above, the nitrate generated in the aerobic filtration tank 50 is converted into an anaerobic water independent of the aerobic circulation flow path of water. Decomposes in circulating water flow path Efficient nitrate in the water tank in a short time by infiltrating nitrate from the aerobic circulation channel into the anaerobic circulation channel and decomposing it in the anaerobic circulation channel that circulates independently from the aerobic circulation channel Decompose well and denitrify and reduce.

Further, by discharging the nitrogen gas generated in the anaerobic circulation flow path so as not to come into contact with the water in the aerobic circulation flow path, the aqueous organism raised in the aerobic circulation flow path, In particular, it promotes the growth of corals, shellfish, invertebrates and the like.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In the present invention, the anaerobic circulation flow path of water centering on the anaerobic filter device is formed independently of the aerobic circulation flow path including the aerobic filtration tank. That is, aerobic circulation of water in the aquatic organism breeding aquarium P through sand separating the aerobic circulation flow path and the anaerobic circulation flow path, or through a water-permeable and oxygen-impermeable screen member. Nitrate is permeated into the anaerobic circulating water channel from the circulating water channel.

Reference numeral 1 in the first embodiment shown in FIGS. 1 to 9 denotes a box-type anaerobic bottom filter unit integrally formed of, for example, a synthetic resin such as an acrylic resin or a vinyl chloride resin. As shown in FIGS. 2, 3, and 5, the anaerobic bottom filter body 1 has a plurality of water holes 2 formed in the form of a punch board on the upper plate side of the box so as to have a saw-like shape. The anaerobic filter device 10 is closed at both ends inside the box, one end of which is open.
And a pair of shower pipes 4 for the suction port and the discharge port are arranged so that the plurality of ejection holes 3 formed in the longitudinal direction are opposed to each other.

FIG. 1 shows the outline of the system, in which nitrate S in a water tank P generated in an aerobic circulating water flow path is permeated into an anaerobic circulating water flow path and taken in.
Is denitrified and reduced in an anaerobic circulating water channel which circulates independently of the aerobic circulating water channel. The anaerobic circulation flow path in the illustrated example uses a closed anaerobic filter device 10 and is disposed in contact with the bottom of a water tank P provided with an optional aerobic filtration tank (not shown) for filtering water in the water tank P. are doing. In this embodiment, the aerobic circulating flowing water path and the anaerobic circulating flowing water path are separated by the powdery sand 5, and the nitrate S in the water tank P passes through the powdery sand 5 to the anaerobic circulating flowing water path. Provided to penetrate. Further, in the anaerobic circulation flow path, the nitrate S taken in by the closed anaerobic filter device 10 using anaerobic bacteria is used.
Decomposes and promotes the growth of anaerobic bacteria.

On the other hand, nitrate S
The nitrogen gas T generated when denitrifying and reducing is discharged in an isolated state so as not to come into contact with the water in the aerobic circulation flow path (see FIGS. 1 and 2). In the illustrated example, a gas discharge pipe 15 is provided in the anaerobic circulating water flow path, and the gas is discharged from the gas discharge pipe 15 by using the floating force of the nitrogen gas T. In addition, by providing the gas discharge pipe 15 in the breeding aquarium, the water level in the breeding aquarium and the water level in the discharge pipe can be identified, and it is possible to prevent the water from being discharged from the discharge pipe. In addition, an organic substance such as methanol or methyl alcohol can be introduced from this outlet to serve as a bait ball.

Further, as shown in FIGS. 5 and 6, a box-shaped anaerobic bottom filter body 1 is disposed on the bottom surface of an aquarium P for breeding aquatic organisms, and the anaerobic bottom filter body 1 is formed in a slender shape. Lay the fine net 7 on the upper surface of the upper plate,
Further, a powdery sand 5 or a water-permeable and oxygen-impermeable screen member having a predetermined thickness of, for example, about 4 cm is laid thereon, and the powdery sand 5 is further placed on the water tank by a water flow. The sand 6 having a sesame grain size or more is laid by a thickness of about 1 cm so as not to flow in the P. In this way, the water inside the anaerobic bottom filter body 1 is sucked by one shower pipe 4 via the forced circulating flowing water pump unit 11 (see FIG. 7) built in the closed type anaerobic filter device 10, and the closed type anaerobic filter device 10 is used. After the reduction treatment through the anaerobic filter device 10, the water is discharged through the other shower pipe 4, and the powdery sand 5 or the water-permeable and oxygen-impermeable material on the upper surface of the saw-like upper plate portion is passed through the water passage hole 2. The nitrate is allowed to penetrate into the water holes 2 through a transparent screen member. The discharge flow rate of the shower pipe 4 at this time matches the discharge flow rate of the pump unit 11 of the hermetic anaerobic filter device 10. At this time, the discharge and suction flow rate by the shower pipe 4 is set to match the discharge and suction flow rate by the pump unit 11 of the hermetic anaerobic filter device 10.

The closed anaerobic filter device 1
Reference numeral 0 denotes an external closed box structure as shown in FIG.
2 and then filled with a bait ball 13 for anaerobic bacteria as a spherical filter material, and further a pump unit 11 for forced circulation flowing water is loaded thereon. In addition, a special box 14 separate from the hermetically sealed anaerobic filter device 10 may be used by filling the bait balls 13 for anaerobic bacteria in a quantity-adjustable manner. Further, in FIG. 8, a flowing water amount checking means 8 is provided between the flowing water paths of the closed type anaerobic filter device 10 and the anaerobic bottom filter body 1. Further, an aerobic circulating water flow path is formed by attaching an upper (upper) aerobic filter 20 having the same configuration as that of the related art to the upper opening of the water tank P. The upper type (upper type) aerobic filter 20 is a pump unit 2 that pumps up water in the water tank P to filter the water with the aerobic filter.
1 and a water pump 22, and the water in the water tank P is always sent from the inlet to the filtering device, and is sent out from the outlet 23 after filtering.

In this embodiment, an upper aerobic filter 20 is employed. However, as shown in FIG. 9, an external aerobic filter 30 disposed outside the water tank P is used as another structure. For example, various aerobic filters may be adopted, and the operation and effect based on the configuration are substantially the same as those of the above-described embodiment, and thus description thereof will be omitted.

An example of the use of the first embodiment will be described. First, the box-shaped anaerobic bottom filter body 1 shown in FIG. 3 is placed and fixed on the bottom in the water tank P, and then the anaerobic bottom filter body 1 is mounted. A fine net 7 is laid on the upper surface of the saw-shaped upper plate portion, and powdery sand 5 or a water-permeable and oxygen-impermeable screen member is further laid to a predetermined thickness of, for example, about 4 cm. Then, sesame granular or more sand 6 is laid thereon to a thickness of about 1 cm so that the powder sand 5 does not flow in the water tank P due to the water flow. Next, an upper (upper) aerobic filter 20 may be attached to the upper opening of the water tank P. Then, the pump unit 11 of the hermetic anaerobic filter device 10
By operating the pump unit 21 for pumping the upper type (upper type) aerobic filter 20, the water inside the box type anaerobic bottom filter body 1 is reduced through the closed type anaerobic filter device 10. After that, the nitrate in the aerobic circulating flowing water path is anaerobically contacted with the powdery sand 5 or the water-permeable and oxygen-impermeable screen member on the upper surface of the saw-like upper plate portion through the water passage hole 2. It penetrates and takes up into the aerobic circulation channel, decomposes nitrate in a short period of time, and enables the growth of anaerobic bacteria more than in the aerobic circulation channel.

FIG. 10 shows a second embodiment of the present invention. The same components as those in FIGS. 1 to 9 showing the first embodiment and the second embodiment are shown. Are denoted by the same reference numerals, and their detailed description is omitted. In the third embodiment, a bottom-type aerobic filter 30 which is disposed above the anaerobic bottom filter body 1 is employed as the aerobic filter type in the second embodiment. . That is, the water tank P
A fine net 36 is laid on the upper surface of the slender-shaped upper plate portion of the anaerobic bottom filter body 1 installed therein, and a powder-shaped sand 35 is laid thereon to a predetermined thickness, and a punch is further formed thereon. After laying the board or net 31, the bottom-type aerobic filter 30 is placed thereon, and the gravel 34 is ground to a predetermined thickness so as to bury the filter portion of the bottom-type aerobic filter 30. Further, the bottom-type aerobic filter 30 is provided on its upper surface with a drain hole (not shown) for sucking water in the water tank P into the filter by a built-in pump unit 32. A discharge nozzle 33 for sending filtered water through a pump unit 32 in order to return the water once sucked into the filter and filtered by the aerobic filter to the inside of the water tank P.
Is erected. In this way, the water in the water tank P is filtered through the scaly water holes (not shown) and the gravel on the water holes (not shown). It should be noted that a well-known air-lift type device that generates air bubbles from an external air pump (not shown) may be employed instead of the built-in pump section 32.

FIG. 11 shows a fourth embodiment of the present invention. The same components as those in FIGS. 1 to 9 showing the first embodiment are denoted by the same reference numerals. Therefore, the detailed description is omitted. In the third embodiment, as an aerobic filter type in the first embodiment, an overflow type aerobic filter 40 combined with a wet filtration device arranged outside the water tank P is employed. is there. That is, the overflow type aerobic filter 40 includes four aerobic filtration chambers 42A, 42B, 42 via three vertical partitions 41.
C and 42D, each of the aerobic filtration chambers is filled with an aerobic filter medium 43, and a water hole (not shown) is provided at the bottom of each of the aerobic filtration chambers. A pump unit 45 connected to the discharge port 44 in the water tank P is attached next to the aerobic filtration chamber. Reference numeral 46 denotes a suction port connected to the aerobic filtration chamber 53A.

FIGS. 12 to 14 show a fourth embodiment of the present invention.
The same components as those in FIGS. 1 to 9 showing the first embodiment and the second embodiment are denoted by the same reference numerals, and detailed The description is omitted. In the fourth embodiment, the box-shaped anaerobic bottom filter body 1 of the first embodiment is set in an overflow type aerobic filtration tank 50 provided outside a water tank P. It is. That is, a plurality of water passage holes 2 are formed in the upper plate portion so as to form a sloping shape, and one end of the opening is connected to the hermetic anaerobic filter device 10 to form a plurality of holes in the longitudinal direction. A box-shaped anaerobic bottom filter body 1 having a pair of suction and discharge shower pipes 4 disposed at both ends of the inside thereof with the blowout holes 3 opposed to each other is provided outside a water tank P for breeding aquatic organisms. It is provided either on the bottom of the water chamber adjacent to the overflow type aerobic filtration tank 50 having the vertical partition 52 (see FIG. 12) or on the bottom side of the aerobic filtration tank 50 (see FIG. 14). The overflow type aerobic filtration tank 50 is provided with two aerobic filtration chambers 53A and 53B via a vertical partition 52 (see FIG. 12).
Alternatively, four aerobic filtration chambers 53A, 53B, 53C,
53A (see FIG. 12), each aerobic filtration chamber is filled with an aerobic filter medium 54, and the bottom of each of the aerobic filtration chambers 53A, 53B has a water hole (not shown).
Is provided. Then, as shown in FIGS. 12 and 13,
In the water chamber adjacent to the aerobic filtration tank 50, a tub-like overflow anaerobic box 55 having an upper opening that can be retrofitted is installed.
Next to 5, a pump unit 51 communicating with the discharge port 56 in the water tank P is attached. Reference numeral 57 denotes a suction port connected to the aerobic filtration chamber 53A. Then, powder-like sand 5 or a water-permeable and oxygen-impermeable screen member is laid on the upper surface of the scalloped upper plate portion of the anaerobic bottom filter body 1, and the water inside the anaerobic bottom filter body 1 is sealed off. It is circulated through the anaerobic filter device 10 and subjected to a reduction treatment, and then through the water passage hole 2 to the powdery sand 5 or the water-permeable and oxygen-impermeable screen member on the upper surface of the glass upper plate portion. It is made to contact.
Gravel 6 is laid on the powdery sand 5 via a punch board or a net, and the pump section 51 contacts the filtered water in the overflow type aerobic filtration tank 50 from above the gravel 6. .

FIG. 15 shows a fifth embodiment of the present invention, and the same components as those in FIG. 14 showing the fourth embodiment are denoted by the same reference numerals. The detailed description is omitted. In the fifth embodiment, the box-shaped anaerobic bottom filter body 1 disposed on the inner bottom of the water tank P according to the fourth embodiment is combined with the wet filtration device disposed on the back of the water tank P. And an overflow type aerobic filtration tank 50.

FIG. 16 shows a sixth embodiment of the present invention. The same components as those in FIGS. 1 to 9 showing the first embodiment and the second embodiment are shown. Are denoted by the same reference numerals and their detailed description is omitted. In the sixth embodiment, the box-type anaerobic bottom filter body 1 of the second embodiment is provided integrally with a water tank P.

FIGS. 17 and 18 show a seventh embodiment of the present invention. The same components as those in FIG. 3 showing the first embodiment are denoted by the same reference numerals. Therefore, the detailed description is omitted. In the seventh embodiment, the box-type anaerobic bottom filter body 1 of the first embodiment is formed as a unit type reduction filter box 60 of a filter tank throw-in type. That is, as shown in FIG. 17, one end opening side is connected to the closed-type anaerobic filter device 10, and a plurality of ejection holes 63 formed in the longitudinal direction are opposed to each other so as to face a suction and a discharge. The pair of shower pipes 64 are disposed at both ends in the lower chamber 62 formed by the punch board 61 on the upper surface side. A powder sand 65 or a water-permeable and oxygen-impermeable screen is provided in the middle chamber 66 between the punch board 61 on the upper surface side of the lower chamber 62 and the permeable screen 67 disposed above the punch board 61. The members are filled into a sandwich to form the transparent screen 67 and the transparent screen 6.
7. A coarse sponge pad or gravel 70 is filled in the upper chamber 69 between the lid-type punch board 68 disposed above and the powder sand 65 or a water-permeable and oxygen-impermeable screen member is prevented from rising. A filter tank throw-in type unit type reduction filter box 60 is formed. As shown in FIG. 18, the middle chamber 66 and the upper chamber 69 are vertically symmetrical with respect to the lower chamber 62.
May be provided to form a unit type reduction filter box 60 of a double-structured filtration tank throw-in type.

Next, examples of the above embodiments will be described based on experimental results. Aerobic filtration equipment is external wet & dry + top filter. (Embodiment 1) First, the case of saltwater fish will be described.
Size 620mm (W) x 360mm (D) x 450m
m (H), on the upper surface of the scaly upper plate portion of the anaerobic bottom filter body disposed in a water tank having a water storage amount of about 70 liters,
Powdery coral sand is laid to a thickness of about 4 cm, and sesame granular coral sand is further laid thereon to a thickness of about 1 cm. The aerobic filtration material is an external wet & dry + upper filter manufactured by Tetra Corporation. At this time, since anoxic condition was confirmed on the sixth day, the system was designed with the same thickness without adding sand. As a result, the results as shown in Table 1 below were obtained.

[0032]

[Table 1]

That is, on the first day of the set, fresh live rock, which is a natural rock collected from the sea, is introduced into a breeding aquarium for about 5 k.
Put the filter material in the external aerobic filter (existing natural bacteria in live rock) and the external anaerobic filter. In addition, commercially available aerobic and anaerobic bacteria (cultivating natural bacteria) Are placed in their respective filters and wait for the bacteria to settle and grow on the filter media. At this time, ammonia and nitrous acid are generated because some of the organisms attached to the live rock are killed.The reason is that it does not match the quality of the artificial seawater and water salt, etc. It is thought to be due to. On the third day, aerobic bacteria were activated to decompose ammonia and nitrous acid, producing nitrate.
On the fourth day, the nitrate in the breeding aquarium penetrates into the anaerobic water side and the concentration starts to decrease. On the 5th day, damselfish
No animals were placed in the aquarium and observation of the living body was started. The animals were fed twice daily in the morning and at night after day 6. On the seventh day, some nitrate was generated in the breeding aquarium, but after the eighth day, it was confirmed that ammonia, nitrite, and nitrate had not been generated as far as commercial reagents were available. In addition, since this day, small air bubbles have risen many times in the nitrogen discharge pipe, and vaginal discharge outside the breeding aquarium has been confirmed. From the above, it was possible to create a safe environment for living organisms of marine fish in about one week.

(Example 2) Next, the system is the same as that of Example 1, but instead of using a commercially available bacterium, 10 damselfish was used as a starting fish. At this time, the starting fish is obtained by waiting for bacteria to spontaneously sprout due to fish droppings, and selecting a strong and inexpensive fish such as a damselfish so that the fish may be damaged in the meantime. As a result, the results as shown in Table 2 below were obtained. That is, as compared with the case of Table 1 described above, the time required for starting the bacteria was four times as long, but the water quality remained stable. At this time, 90 damselfish have been added since day 30.

[0035]

[Table 2]

(Example 3) Next, an anaerobic bottom filter body having a size equivalent to one-fourth of the bottom area of the water tank and the filtration tank was used. In the case of making, as shown in Table 3 below, it took a little time to decompose nitrate due to the small area of the anaerobic filter, but it was found that the water quality was stable. At this time, a commercially available bacterium was used to start up the bacterium, and the number of fish was 100 damselfish as in Example 1 described above.

[0037]

[Table 3]

(Example 4) Next, the case of a freshwater fish will be described. In this experiment, a fish named Discus was intentionally selected. Conventionally, this type of fish has characteristics that are not found in other fish, as it is well known that breeding requires frequent water changes. Firstly, it requires a high-protein diet called raw beef lean minced food, secondly, the growth period of fry to adult fish is extremely heavy, and thirdly, the water temperature is as high as about 30 ° C. (Approximately 26 ° C. for ordinary fish), bacteria are slow to spring up, and fourthly, they are sensitive to water quality and easily fall sick. The aerobic system is an external wet and dry + upper filter as in seawater. Because sand wants to maintain neutral to weakly acidic pH, river sand and Oiso gravel were used. As a result, as shown in Table 4 below, the system was started up as quickly as about one month, and the water quality was stabilized.

[0039]

[Table 4]

(Embodiment 5) In this embodiment, an anaerobic bottom filter body which is a freshwater fish named DISKUS and has a size corresponding to a quarter of the bottom area of the water tank and the filtration tank was used. As a result, as shown in Table 5 below, it was found that the time required was twice as long as that of Example 4, but the water quality was stable. Therefore, based on the data of Example 4 and Example 5, it can be determined that water quality stabilization for ordinary fish breeding is easy.

[0041]

[Table 5]

(Embodiment 6) The present embodiment is an experimental result obtained by changing the number of fish in a stable aquarium P after 30 days or more.
Water quality tests were conducted at intervals of about 5 days each.
As a result, as shown in Table 6 below, reducing the number of fish reduces the nitrite ion concentration and nitrate ion concentration, and increasing the number of fish increases the concentration. Further, when the number of animals was doubled to 200, it was found that nitrate ions were generated in the water tank P. Therefore, it was confirmed that the allowable amount was exceeded. As described above, the amount of the filter medium of the closed anaerobic filter device 10, the closed anaerobic filter device 10, and the It is easy to achieve a sufficient balance by increasing the amount of flowing water between the flowing water path to the bottom filter body 1 for use.

[0043]

[Table 6]

As shown in the above Examples, particularly Tables 1, 2 and 3, it can be seen that calcium ions in seawater gradually increase and are stable in seawater. Calcium ions are extremely important components for breeding, for example, corals and shellfish, and are necessary components for breeding marine organisms.

[0045]

As described above, according to the present invention, the following effects can be obtained. (1) It is possible to decompose and denitrate nitrate, which is a harmful factor in breeding organisms such as ornamental tropical fish and corals, edible fish and shellfish, in a short time, and to obtain complete water purification. (2) Since the reduced nitrogen is discharged in a state separated from the breeding water, the nitrogen does not dissolve in the breeding water, so that the growth of corals, shellfish, invertebrates and the like can be particularly promoted. (3) We succeeded in increasing calcium ions in seawater, which is impossible with the conventional technology. (4) The frequency of water exchange can be minimized, purification costs can be reduced, and human fatigue and labor due to water exchange can be reduced. (5) Enables bacterial growth in a short period of time. (6) Many animals can be bred in a water tank without changing water. (7) The appearance of moss and algae that are unsightly visible can be suppressed. (8) Diseases and infectious diseases of living things can be easily prevented. (9) Water quality can be stabilized. (10) A large amount of anaerobic bacteria can be grown and maintained. (11) Damage to organisms in the aquarium due to water change can be eliminated. (12) An anaerobic processing capacity corresponding to the aerobic processing capacity can be created in a short period of time, and furthermore, it is possible to multiply the anaerobic processing capacity. (13) The transparency of the breeding water is increased.

[Brief description of the drawings]

FIG. 1 is a partially omitted cross-sectional view schematically showing a system according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the anaerobic bottom filter body.

FIG. 3 is a perspective view of the anaerobic bottom filter body.

FIG. 4 is a perspective view showing a net mounted state of the anaerobic bottom filter body.

FIG. 5 is a perspective view showing a state where the anaerobic bottom filter body is attached to a water tank.

FIG. 6 is a side view showing a state in which the anaerobic bottom filter body is attached to a water tank.

FIG. 7 is an explanatory diagram showing an effect in the first embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a configuration of a closed anaerobic filter device.

FIG. 9 is a cross-sectional view of a water tank showing a mounted state of the anaerobic bottom filter body according to the first embodiment of the present invention.

FIG. 10 is a cross-sectional view of a water tank showing an attached state of an anaerobic bottom filter body according to another embodiment of the present invention.

FIG. 11 is a cross-sectional view of a water tank showing an attached state of an anaerobic bottom filter body according to a second embodiment of the present invention.

FIG. 12 is a cross-sectional view of a water tank showing an attached state of an anaerobic bottom filter body according to a third embodiment of the present invention.

FIG. 13 is a perspective view of an anaerobic box for overflow.

FIG. 14 is a cross-sectional view illustrating a configuration of an overflow filtration layer according to a third embodiment of the present invention.

FIG. 15 is a perspective view of a water tank showing an attached state of an anaerobic bottom filter body according to a fourth embodiment of the present invention.

FIG. 16 is a perspective view of a water tank showing an attached state of an anaerobic bottom filter body according to a fifth embodiment of the present invention.

FIG. 17 is a perspective view illustrating a configuration of an integrated reduction filter box according to a sixth embodiment of the present invention.

FIG. 18 is a perspective view illustrating a configuration of an integrated reduction filter box according to a seventh embodiment of the present invention.

[Explanation of symbols]

P Water tank S Nitrate T Nitrogen gas 1 Anaerobic bottom filter body 2 Water hole 3 Spout hole 4 Shower pipe 5 Powdery sand 6 Gravel 7 Net 8 Flow rate check means 10 Sealed anaerobic filter 11, 21 Pump section 13 Food ball 14 Exclusive box 15 Gas exhaust pipe 20 Upper type (upper type) aerobic filter 22 Pumping pipe 23 Spout port 30 External type aerobic filter 40, 50 Overflow type aerobic filter

Claims (10)

[Claims] An aerobic circulating water flow path reduced by a filter using an aerobic bacterium and an anaerobic circulating water flow path reduced by a filter using an anaerobic bacterium are formed in separate systems. The nitrate generated in the aerobic circulating water flow path is passed through a sand separating the aerobic circulating water flow path and the anaerobic circulating water flow path, or a permeable and oxygen impermeable screen member. A system for purifying denitrification-reduced water by a facultative anaerobic bacterium, wherein the nitrate is decomposed in an anaerobic circulating water flow path that circulates independently of the aerobic circulating water flow path. 2. The method according to claim 1, wherein nitrogen gas generated when nitrate is decomposed in the anaerobic circulation flow path is discharged in a state of being isolated so as not to come into contact with water in the aerobic circulation flow path. A denitrification and reduction water purification system using facultative anaerobic bacteria. 3. The bottom of the aerobic filtration tank, wherein the anaerobic circulation water flow path is connected to the bottom of an aquatic breeding aquarium, the bottom of a water chamber adjacent to an external aerobic filtration tank connected to the aquatic breeding aquarium, or the bottom of an aerobic filtration tank. 3. The purification system for denitrified and reduced water by a facultatively anaerobic bacterium according to claim 1 or 2, wherein the system is disposed on a side of the denitrified and reduced water. 4. A plurality of water holes are formed in the upper plate, and one end of each of the holes is connected to a closed anaerobic filter device, and the plurality of holes formed in the longitudinal direction are opposed to each other. A box-shaped anaerobic bottom filter body comprising a pair of suction pipes for suction and discharge at both ends inside is arranged on the bottom of an aquarium for breeding aqueous creatures, and the anaerobic bottom filter is provided. A powdery sand or a water-permeable and oxygen-impermeable screen member is laid on the upper surface of the upper plate portion of the body, and water inside the anaerobic bottom filter body is circulated through the hermetic anaerobic filter device. 3. A purification system for denitrified reduced water by a facultative anaerobic bacterium according to claim 1 or 2, wherein after the reduction treatment, the denitrification-reduced water purification system using the facultative anaerobic bacteria is brought into contact with powdery sand or a screen member on the upper surface of the upper plate portion through the water passage hole. Tem. 5. A plurality of water holes are formed in the upper plate portion, one end of each of which is connected to a closed anaerobic filter device, and a plurality of ejection holes formed in the longitudinal direction are opposed to each other. A box-shaped anaerobic bottom filter body having a pair of suction pipes for suction and discharge arranged at both ends inside the tank is provided adjacent to an aerobic filtration tank provided outside a water tank for breeding aqueous organisms. At the bottom of the room or at the bottom of the aerobic filtration tank, a powdery sand or a water-permeable and oxygen-impermeable screen member is laid on the upper surface of the upper plate of the anaerobic bottom filter body. The water inside the bottom filter body is circulated through the hermetic anaerobic filter device and reduced, and then brought into contact with powdery sand or a screen member on the upper surface of the upper plate portion through the water passage hole. The denitrification-reduced water purification treatment system using facultative anaerobic bacteria according to claim 1 or 2. 6. A pair of suction and discharge shower pipes each having one open end connected to a closed anaerobic filter device and having a plurality of blowout holes formed in the longitudinal direction thereof facing each other. The upper surface is disposed at both ends of the lower chamber formed of a punch board, and powdery sand or water-permeable material is provided in the middle chamber between the punch board on the upper surface side of the lower chamber and the permeable screen disposed above the punch board. A filter tank throw-in type which is filled with a coarse sponge pad or gravel in an upper chamber between the permeable screen and a punch board disposed above the permeable screen, which is filled with a screen member impermeable to oxygen. 3. The purification system for denitrified reduced water by a facultative anaerobic bacterium according to claim 1 or 2, wherein the unit type reduction filter box is formed. 7. The water tank has an upper aerobic filter disposed at an upper opening thereof, an external aerobic filter disposed outside thereof, and a bottom aerobic laminated and disposed above the anaerobic bottom filter body. The denitrification-reduced water purification treatment system using facultative anaerobic bacteria according to any one of claims 1 to 6, further comprising a filter, and an aerobic filter combined with a wet filtration device disposed outside or on the back of the filter. 8. The airtight anaerobic filter device according to claim 1, wherein a bait ball for anaerobic bacteria is filled together with a filter medium for fixing bacteria, integrally with a pump section for forced circulation water flow. The denitrification-reduced water purification system using facultative anaerobic bacteria according to the above. 9. The denitrification reduction by a facultative anaerobic bacterium according to any one of claims 1 to 8, wherein a flowing water amount confirming means is provided between a flowing water path between the closed anaerobic filter device and the anaerobic bottom filter body. Water purification treatment system. 10. The oxygen-free state in the water tank is constantly inspected and confirmed with a reagent, and the amount of filter material of the closed anaerobic filter device, the closed anaerobic filter device and the anaerobic bottom surface are measured until the oxygen value reaches an allowable value. 2. The apparatus according to claim 1, further comprising means for changing a flow rate between the flow path and the filter body.
10. The purification system for denitrified and reduced water using facultative anaerobic bacteria according to any one of claims 9 to 9.