JP2022146025A - water circulation system - Google Patents

Abstract

To provide a water circulation system that does not require water change by promoting activity of microorganisms present in a growth tank.SOLUTION: A water circulation system according to the present invention is configured to comprise a first tank, a second tank provided separately from the first tank, a porous material installed at a bottom part of the first tank and the second tank, and a bubble generation device that supplies bubbles to the first tank. Water is circulated in the first tank and the second tank by introducing a microorganism activator, and balance of aerobic and anaerobic microorganisms present in the first tank and the second tank can be adjusted by action of the microorganism activator.SELECTED DRAWING: Figure 1

Description

The present invention relates to a circulation system for water (both fresh water and seawater) that eliminates the need to change water in a water tank.

A soil improvement method has been proposed in which the oxygen-poor state in the soil is improved by using bubbly water (fine bubbles (microbubbles) formed in water) (for example, Patent Document 1 reference). According to this method, the use of bubbly water can improve the regeneration of soil in fisheries environments or tidal flats where oxygen is significantly depleted, and can be applied to various fields such as hydroponics and aquaculture.
Also, a filter device that incorporates a natural purification mechanism has already been proposed (see, for example, Non-Patent Document 1).
This device uses a plurality of long and thin cylindrical filter layers containing filter medium porous materials, and allows water to flow vertically through the filter layers to make the desired water. And the two steps eliminate the need for water changes. The filter medium porous material contains food for anaerobic bacteria.

Japanese Patent No. 3934393

Bio Lab Totto Co., Ltd. website (totto.co.jp)

However, although the method for improving soil described in Patent Document 1 describes the use of air bubble water, it does not consider microorganisms inhabiting the soil. However, it was not possible to elucidate the specific mechanism that contributes to the improvement of
On the other hand, it is also conceivable to use something like the filter device described in Non-Patent Document 1. However, even if the filter device described in Non-Patent Document 1 was used, the residual nitrogen could not be sufficiently treated. In order to sufficiently treat the residual nitrogen, denitrification, which is a process of dissipating nitrogen compounds in the atmosphere as molecular nitrogen, must be performed. Although the denitrification process is a reduction reaction, the reduction reaction requires enormous physical and electrical energy, so enzymes or bacteria that directly require oxygen from nitrogen compounds are required.
Furthermore, conventional water treatment focuses on filtration and nitrogen treatment, with the primary goal of removing impurities, including nitrogen. If the purpose is to make drinking water or pool water, conventional water treatment, whose primary purpose is to remove impurities, is also effective. However, nitrogen is indispensable for living things, and it is both poisonous and nutritious. Conventionally, there has been no water treatment system that considers this point.

The present invention was made to solve the above problems, and aims to provide a water circulation system that does not require water changes by promoting the activity of microorganisms existing in the growth tank.

A water circulation system according to the present invention includes a first tank, a second tank provided separately from the first tank, a porous material installed at the bottom of the first tank and the second tank, a bubble generator that supplies bubbles to the first tank, and a microbial activator is introduced to circulate water in the first tank and the second tank, and the action of the microbial activator causes the This makes it possible to balance the aerobic and anaerobic microorganisms present in the first tank and the second tank.

In the water circulation system according to the present invention, the microbial activator contains at least amino acids, organic acids, sugars and vitamins.

In the water circulation system according to the present invention, one pump can circulate the water stored in the first tank to the bubble generator and the second tank, or to each of them.

In the water circulation system according to the present invention, a reservoir is installed in a part of the bottom of the first tank, and water drawn from the bottom of the reservoir or the vicinity of the bottom is supplied to the bubble generator and the second tank. , or made available to each.

According to the water circulation system according to the present invention, the action of the microbial activator put into the water stored in the first tank and the second tank functioning as growth tanks for aquatic organisms causes the first tank and the second tank to grow. Since we tried to balance existing aerobic and anaerobic microorganisms, we created a virtuous cycle inherent in the natural world, and used nitrogen sources as nutrients and medicines. You can create a virtuous cycle environment. In addition, according to the water circulation system of the present invention, the porous material can provide a place for microorganisms to settle, and the bubbles (air) supplied from the bubble generator promote nitrogen treatment, resulting in a water change. becomes unnecessary.
Furthermore, according to the water circulation system of the present invention, since the second tank is provided, the precipitated sludge, which serves as a nitrogen source, is removed from the second tank without providing a filter for collecting and disposing of the precipitated sludge, which serves as a nitrogen source. In the second tank, the precipitated sludge can be decomposed and converted into useful materials.

According to the water circulation system of the present invention, since a decomposable microbial activator is added, it is possible to effectively activate microorganisms.

According to the water circulation system according to the present invention, one pump can drive the bubble generator and change the water circulation path, so there is no need to install a plurality of pumps, which saves space and cost. is also effective.

According to the water circulation system according to the present invention, the sediment accumulated in the reservoir of the first tank is sent to the bubble generator and the second tank, and part of the extracted sediment is finely divided by the bubble generator. It is crushed and part of it is sent to the second tank for decomposition treatment.

1 is a configuration diagram schematically showing an example of a system configuration of a water circulator according to an embodiment of the present invention; FIG. 1 is a partial configuration diagram schematically showing an enlarged configuration example of a water supply portion of a water circulation system according to an embodiment of the present invention; FIG. FIG. 4 is a partial configuration diagram schematically showing another configuration example of the drainage portion of the water circulation system according to the embodiment of the present invention;

A water circulation system (hereinafter referred to as system 100) according to the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram schematically showing an example of the system configuration of the system 100. As shown in FIG. FIG. 2 is a partial configuration diagram schematically showing an enlarged configuration example of the water supply portion of the system 100. As shown in FIG. FIG. 3 is a partial configuration diagram schematically showing another configuration example of the drainage portion of the system 100. As shown in FIG. The system configuration, operation, and effects of the system 100 will be described with reference to FIGS. 1 to 3. FIG.

The system 100 eliminates the need for changing the water in the growth tanks (main tank 10 and sub tank 20). The water stored in the growth tank may be fresh water or sea water. The system 100 includes the main tank 10, for example, crustaceans (shrimp, crab, etc.), fish (saltwater fish, freshwater fish, etc.), shellfish (turban shell, abalone, etc.), plants (seaweed, aquatic plants, etc.), echinoderms (sea urchins, etc.). , sea cucumbers, starfish, etc.).

<System Image of System 100>
The system 100 includes a microbial activator (including a treatment agent using a biostimulant), a bubble generator, a porous material, a main tank containing them, and a sub tank capable of breeding samples of aquatic organisms. Consists of The main tank and the sub tank may be collectively referred to as a growth tank.
Specifically, the system 100 uses a porous material in addition to the bubbles (which may be microbubbles or nanobubbles) generated by the bubble generator to facilitate the functions of the bubbles and the microbial active agent. I'm trying As a result, the functions of the bubbles and the microbial activator are more likely to be exerted, and the quality of the water circulating in the growth tank reduces stress on aquatic organisms, further enhancing the biostimulant effect.
A biostimulant is a technology that reduces damage to organisms caused by environmental conditions and provides healthy organisms by controlling abiotic stress on organisms.

The microbial activator activates the microorganisms living in the growth tank and restores and improves the self-cleaning ability of the microorganisms. Microbial active agents contain at least amino acids, organic acids, sugars and vitamins. The microbial activator activates the microorganisms in the water of the growth tank and reforms the growth environment of the aquatic organisms present in the growth tank by the function of the microorganisms themselves.

Amino acids are the building blocks of proteins in living organisms.
Organic acid is a general term for organic compounds exhibiting acidity.
Saccharides are the initial oxidation products of polyhydric alcohols and are a general term for those having one aldehyde group or ketone group.
Vitamins are a general term for organic compounds other than carbohydrates, proteins, and lipids, which cannot be synthesized in sufficient amounts within the body of living organisms, among the nutrients necessary for the survival and growth of living organisms.

What is important for improving the growth environment of aquatic organisms is to allow aerobic and anaerobic microorganisms to coexist in a well-balanced manner in the growth tank. In such an environment, the action of microorganisms is activated, and the activated microorganisms eat and decompose dirt (organic substances) in the water in the growth tank. Therefore, in the system 100, aerobic microorganisms and anaerobic microorganisms coexist in a well-balanced manner by using a microbial activator, thereby creating a virtuous cycle of substances within the system.

When the microbial activator is put into the main tank, the microbial activator converts ammonia to nitrogen and nitrogen oxides, hydrogen sulfide to sulfur oxides, and organic compounds in the water stored in the growth tank. Promote decomposition. As a result, the microorganisms living in the growth tank, such as nitrifying bacteria, sulfur-oxidizing bacteria, devaginal bacteria, organic compound-degrading bacteria, and agglutinating bacteria, are activated. In addition, the microbial activator also improves the activity of photosynthetic bacteria and organic compound-degrading bacteria, which are anaerobic microorganisms. Some of the microorganisms living in the growth tank float in the water. Another portion is fixed to the porous material placed on the bottom of the growth tank. A microbial active agent activates any microorganism.

By activating microorganisms, unwanted microorganisms are reduced. A reduction in the number of unwanted microorganisms reduces the amount of oxygen consumed, and oxygen is supplied to aerobic bacteria accordingly. Therefore, the activity of aerobic useful microorganisms is promoted. Nutrient sources are decomposed and fermented by aerobic/anaerobic organic compound-degrading bacteria before being supplied. Enzymes and coenzymes are produced in all processes, maintaining a virtuous cycle. As described above, in the system 100, the microbial activator supplies a trigger for creating a virtuous cycle and a minimum amount of substances necessary for maintaining the virtuous cycle.

The bubble generator is for generating bubbles in the water stored in the main tank. That is, the bubble generator serves to supply air into the main tank water.
A porous material is placed on the bottom of each of the main tank and the sub tank, and functions as a colonization site for microorganisms living in those tanks.
The main tank is the main place for growing aquatic organisms. Although the size is arbitrary, it is preferable to construct a container capable of storing 1000 liters of water, for example.
The sub-tank enables samples of aquatic organisms to be reared, and is preferably composed of a container smaller in volume than the main tank. It is preferable to configure the inside so that the inside can be visually recognized with a transparent member for sample rearing.

<System configuration of system 100>
As described above, system 100 includes a microbial active agent, a bubble generator, a porous material, a main tank, and a secondary tank. The configuration of the system 100 will be described below with reference to FIGS. 1 to 3. FIG. In the following description, the main tank is called the main tank 10, the sub tank is called the sub tank 20, the bubble generator is called the bubble generator 30, and the porous material installed in the main tank 10 is the porous material 12 , and the porous material installed in the sub-tank 20 is referred to as a porous material 21 .

The main tank (first tank) 10 functions as a breeding tank for aquatic organisms. A porous material 12 is provided in the main tank 10 . The volume of the main tank 10 may be determined according to the aquatic organisms to be reared.
The porous material 12 is installed so as to be laid on the bottom of the main bath 10 . The type of the porous material 12 is not particularly limited as long as it is a porous member. The thickness of the porous material 12 needs to be thick enough to embed the water pipe 73 .

A portion of the bottom of the main tank 10 functions as a reservoir 11 . The storage part 11 is configured by a recess formed in a part of the bottom of the main tank 10 . The storage part 11 stores sediments such as excrement of microorganisms, corpses of microorganisms, and the like. A water pipe 72 is connected to the storage section 11 so that the sediment stored in the storage section 11 can be supplied to the sub tank 20 and/or the bubble sending device 30 .

A bubble generator 30 is installed in the main tank 10 . The bubble generator 30 functions as a microbubble/nanobubble generator, and supplies generated bubbles into the water stored in the main tank 10 . The bubble generator 30 may be any device that can pass foreign matter with a diameter of about 2 millimeters and can generate bubbles with a diameter of 20 micrometers or less. A water pipe 71 and an air pipe 31 are connected to the bubble generator 30 to supply water and air. By providing the bubble generator 30, it becomes possible to supply air to the water stored in the main tank 10, making it possible to make the main tank 10 into an aerobic organic substance decomposition environment.

Also, a drain section 40 and a water supply section 45 are connected to the main tank 10 .
The drain section 40 guides water overflowing from the main tank 10 to the outside of the main tank 10 . The drainage unit 40 is preferably configured by providing the end of the water pipe 77 in the vicinity of the overflow allowance. Specifically, as shown in FIG. 2 , a connection portion 42 may be provided at the end of the water pipe 77 to configure the drainage portion 40 . A mesh 43 may be provided at the tip of the connecting portion 42 . For the mesh 43, for example, 30 mesh may be applied. By providing the drainage part 40, it becomes possible to discharge the scum floating on the water surface of the main tank 10 to the outside together with the overflowed water. A valve 19 is provided in the water pipe 77 so that the valve 19 can be opened and closed as required.

The water supply unit 45 supplies water to the main tank 10 . For example, as shown in FIG. 1, the water stored in the replenishment water tank 46 may be configured to be supplied to the main tank 10 via the water pipe 78 . A pump 17 is provided in the water pipe 78, and the pump 17 is driven to supply water as needed. Alternatively, as shown in FIG. 3, water may be supplied to the main tank 10 through the bubble generator 30 by connecting the water pipe 78 to the air pipe 31 without using the pump 17 . At this time, the water pipe 78 is provided with a valve 81 that can be opened and closed, and the opening and closing may be controlled as necessary. It should be noted that supplementary water is supplied to the supplementary water tank 46 through a water pipe 79 . Because the system 100 circulates water, some percent of the water will evaporate. Therefore, it is advisable to set a timer so that water can be supplied periodically.

The sub-tank (second tank) 20 is provided as a tank separate from the main tank 10, and is configured to allow sample rearing of the aquatic organisms reared in the main tank 10. FIG. The sub-tank 20 is also provided with a porous material 21 like the main tank 10 . Similar to the porous material 12, the porous material 21 is not particularly limited in kind as long as it is a porous member. The volume of the porous material 21 may be determined according to the aquatic organisms to be reared and the size of the sub tank 20 . The porous material 21 may be the same as or different from the porous material 12 . Moreover, the sub tank 20 is not provided with the bubble generator 30 .

A water pipe 76 is connected to the sub tank 20 so that water that has passed through the porous material 21 laid on the bottom of the sub tank 20 can be supplied to the main tank 10 . The water pipe 76 is T-shaped inside the sub-tank 20, is open at the bottom, is embedded in the porous material 21 laid on the bottom, is open at the top, and is above the water level of the sub-tank 20. It has come out and is designed not to cause a siphon phenomenon. A water pipe 75 is connected to the sub-tank 20 so that water taken out from the reservoir 11 of the main tank 10 is supplied to the sub-tank 20 . It should be noted that the water pipe 76 does not have to be strictly T-shaped inside the sub tank 20, and may be branched into two branches inside the sub tank 20. FIG.

<Piping configuration>
System 100 includes water line 71 , water line 72 , water line 73 , water line 74 , water line 75 , water line 76 , water line 77 , water line 78 , water line 79 .
System 100 also includes three-way valve 13 , pump 14 , valve 15 , valve 16 , pump 17 and valve 19 .
Additionally, system 100 includes air line 31 .

The water pipe 71 is connected to the bubble generator 30 and guides the water stored in the reservoir 11 of the main tank 10 to the bubble generator 30 via the water pipes 72 and 74 .
The water pipe 72 is connected to the reservoir 11 of the main tank 10 (specifically, the bottom of the reservoir 11 or the vicinity of the bottom of the reservoir 11 ), and guides the water in the reservoir 11 to the three-way valve 13 .
The water pipe 73 has one end connected to the three-way valve 13 , the other end connected to the main tank 10 , and buried in the porous material 12 . In addition, the embedded portion has a large number of holes with a diameter of about 2 mm, and guides the water that has passed through the porous material 12 laid on the bottom of the main tank 10 to the three-way valve 13 .

The water pipe 74 connects the three-way valve 13 with the water pipe 71 and the water pipe 75 . A pump 14 is installed in the water pipe 74, and when the pump 14 is driven, water flows. A valve 15 is installed in the water pipe 74 , and water is introduced to the water pipe 71 and/or the water pipe 75 by opening and closing the valve 15 .
The water pipe 75 connects the water pipe 74 and the sub tank 20 , and guides the water from the water pipe 74 to the sub tank 20 when the valve 15 is opened.

The water pipe 76 is connected to one end branched in a T shape in the sub-tank 20 and connected to the main tank 10 at the other end, and passes through the porous material 21 laid on the bottom of the sub-tank 20. The water thus obtained is led to the main tank 10. - 特許庁
The water pipe 77 functions as part of the drain section 40 and drains the water in the main tank 10 to the outside. A valve 19 is installed in the water pipe 77 so that water flows according to the opening and closing of the valve 19 .
The water pipe 78 functions as part of the water supply unit 45 and guides the water in the replenishment water tank 46 to the main tank 10 .
The water pipe 79 guides replenishment water to the replenishment water tank 46 .

The three-way valve 13 is connected to the water pipe 72, the water pipe 73, and the water pipe 74, and the switching is controlled to guide the water from the water pipe 72 to the water pipe 74 and from the water pipe 73 to the water pipe 74. It is.
The pump 14 is installed in a water pipe 74, and pumps water that has mainly passed through the porous material 12 laid on the bottom of the main tank 10 through the water pipe 71, the bubble generator 30, and the water pipe 75. and is driven to feed water to the sub-tank 20. Also, by switching the three-way valve 13 , the water via the water pipe 72 can be led to the water pipe 74 .

The valve 15 guides part of the water flowing through the water pipe 74 to the water pipe 75 by adjusting the degree of opening, thereby adjusting the amount of water flowing into the sub-tank 20 . In addition, it is closed to guide the entire amount of water to the water pipe 71 .
The valve 16 is installed in the air pipe 31 and controlled to open and close to guide air to the bubble generator 30 and adjust the air volume and bubble diameter.
The pump 17 is installed in the water pipe 78 and guides the water in the replenishment water tank 46 to the main tank 10 by controlling the drive.

The valve 19 is installed in the water pipe 77 and is controlled to open and close to guide the water in the main tank 10 to the outside.
The air pipe 31 has one end connected to the bubble generator 30 and the other end connected to an air supply device, and guides the air supplied from the air supply device to the bubble generator 30 .
Each valve may be manually controlled or automatically controlled. Moreover, it is good also as manual control for a part. In the case of automatic control, driving is controlled by control means (not shown). Further, the driving of each pump is controlled by control means (not shown).

<Operation of System 100>
Q (liter) is the volume of the main tank 10, q (liter) is the volume of the sub tank 20, and V (liter/min) is the water flow rate (circulation rate), Q=5q, q=10 (min)×V Then, the initial input amount of the microbial activator is set to 10 mg/liter with respect to the initial total amount of water. Then, 2 mg/liter of microbial activator is added once a week to once a month. Note that the initial input amount of the microbial activator fluctuates depending on the water quality load.

First, the porous material 12 is installed in the main tank 10 and the porous material 21 is installed in the sub tank 20 . Then, water is supplied to the main bath 10 and the sub bath 20 . Once the water is supplied, the microbial active agent is added. The initial input amount of the microbial activator is determined by the above formula. This amount of microbial activator is added to the main tank 10 and the situation thereafter is monitored. Depending on the situation, the microbial activator may be added several times. Then, depending on the state of the main tank 10, the microbial activator may be added. Also, bubbles are supplied from the bubble generator 30 . Then, the aquatic organisms to be reared are introduced.

For example, by measuring several indicators (e.g. pH, BOD, COD, ammonium nitrogen, nitrate nitrogen, nitrite nitrogen, dissolved oxygen, turbidity, salinity, conductivity, coliform count), the main The condition of the tank 10 can be determined.

BOD (Biochemical Oxygen Demand) is a value indicating biological oxygen demand, that is, the amount of oxygen required to decompose pollutants in water. COD (Chemical Oxygen Demand) is a chemical oxygen demand, that is, a value obtained by capturing the amount of oxygen consumed when organic matter is chemically oxidized as the amount of organic matter.

By applying a microbial activator to the system 100, it is possible to recover and improve the self-cleaning ability of microorganisms living in the growth tanks (main tank 10 and sub tank 20), and promote the decomposition of organic sludge that is the source of contamination. can be achieved. In other words, the microbial activator restores and activates the environment in which the microorganisms that are indispensable for the purification of the natural world can survive, thereby recovering and improving the self-cleansing ability of the microorganisms.

In addition, since the sub tank 20 is not directly supplied with bubbles from the bubble generator 30, the sub tank 20 is less air-rich than the main tank 10. Therefore, it is possible to move some of the aquatic organisms reared in the main tank 10 and check the breeding state of the aquatic organisms.

<Action and effect of system 100>
What is important in breeding aquatic organisms in the system 100 is the coexistence of aerobic and anaerobic microorganisms in a well-balanced manner. If such an environment exists, the function of microorganisms will be activated, and the activated microorganisms will eat and decompose dirt (organic matter) in the water. As a result, the growing environment of the aquatic organisms in the system 100 becomes close to the natural environment. Therefore, in the system 100, aerobic microorganisms and anaerobic microorganisms coexist in a well-balanced manner by introducing a microbial activator, creating an opportunity for a virtuous cycle of substances. In other words, the purpose of the microbial activator is to restore and maintain the self-cleaning ability of the microbial community.

Microbial active agents act on protozoa (bacteria) of higher microorganisms (higher bacteria) and bacteria of lower microorganisms (lower bacteria). Protozoa and bacteria then become active and decompose the organic compounds in the water that are the source of the contamination. Therefore, the microbial activator has the function of assisting the natural activities of microorganisms, which play a major role in decomposing organic compounds.

Nitrogen sources such as aquatic organisms' excrement, carcasses, food slag, and shedding slag need to be treated in rearing aquatic organisms. Nitrogen is essential for living things in the first place, and it is both poisonous and nutritious. The system 100 uses a microbial activator to remove nitrogen sources, such as excrement, carcasses, feed slags, and shedding slags of aquatic organisms, which are sources of pollution and poison, by using microbial activators to create a virtuous cycle inherent in the natural world, thereby providing nutrients, medicines, and other virtuous cycles. It creates raw materials, enzymes and coenzymes to create a virtuous cycle environment.
A typical nitrogen treatment is generally as follows.
・Decomposition: Decomposition with water to form ammonia (NH ₃ ) and ammonia ion (NH ₄ ⁺ ) (including ammonia compounds)
NH ₃ +H ₂ O⇔NH ₄ ⁺ +OH ⁻
・Nitrification: NH ₄ ⁺ →NO ₂ ⁻ →NO ₃ ⁻ by aerobic bacteria
・Denitrification: NO ₃ ^- → NO ₂ ^- → NO → N ₂ O → N ₂ by anaerobic bacteria

In addition to the above, all reactions are mediated by bacteria and enzymatic degradation and denitrification.
・Degradation: Example) Urea degrading enzyme (urease)
CO( _NH2 ) ₂ + _H2O → _2NH3 + _CO2
Nitrification: Ammonia-oxidizing bacteria (Nitrosomonas genus), nitrite-oxidizing bacteria (Nitrobacter family)
・Denitrification: Reductases produced by various anaerobic fungi Nitrate reductase, nitrite reductase, nitric oxide reductase, nitrite reductase

A bubble generator 30 is installed in the system 100 . Therefore, the nitrogen treatment in the case of using only the bubble generator 30 without using the microbial activator and the porous material 12, the sub-tank 20 and the porous material 21 will be examined. As a result of the examination, two hypotheses were established.
The first hypothesis is due to forced oxidation by micro-nano bubbles generated from the bubble generator 30 . In the forced oxidation by micro-nanobubbles, the valences in each state of nitrogen N are NH ₄ ⁺ (valence -3), NH ₃ (valence -3), N ₂ (valence 0), N ₂ O (valence +1), NO (valence +2), NO ₂ ⁻ (valence +3), NH ₃ ⁻ (valence +3). ₃ , NH ₄ ⁺ ) is changed to N ₂ , NO ₂ ⁻ and NO ₃ ⁻ by forced oxidation.
Although a small amount, some of it becomes gas in the form of N ₂ and is released to the atmosphere, and some remains in the form of NO ₃ ^- . It does not remain in the state of NO ₂ ^- but is oxidized to NO ₃ ^- . The capability required of the bubble generator 30 is to generate O ₂ (O ²⁻ ) having enough physical and electrical energy to separate H ⁺ ions from NH ₃ (NH ₄ ⁺ ).

The second hypothesis is that the ammonia stripping method, which is one of ammonia treatments, is performed by the bubble generator 30 without using an alkaline agent. The ammonia stripping method is a method of removing ammonia nitrogen in water by a chemical reaction, in which NH ₄ ⁺ reacts with an alkaline agent, OH ⁻ , and is released into the atmosphere as NH ₃ gas. The reaction formula can be expressed as NH ₄ ⁺ +OH ⁻ →NH ₃ ↑+H ₂ O, but in the bubble generator 30 4NH ₄ ⁺ +O ₂ ⁻ →4NH ₃ ↑+2H ₂ O. In addition, part of it becomes NH ₃ +2O ₂ →NO ₃ ⁻ +H ₂ O+H ⁺ . Since NO ₃ ^- remains in any method, the concentration of nitrogen oxides occurs in the circulation system. Therefore, denitrification is required.
On the other hand, the denitrification process in which nitrogen oxides are released into the atmosphere as molecular nitrogen is reduction. Since the reduction requires enormous physical and electrical energy, it requires enzymes or bacteria that require the oxygen of nitrogen oxides directly. The microbial activator applied to the system 100, the porous material 12, the sub-tank 20, It is the porous material 21 .

As described above, the system 100 can promote the activity of microorganisms present in the growth tanks (main tank 10, sub tank 20) by adding the microbial activator, and the micro-organisms provided from the bubble generator 30 can be activated. The nanobubbles further promote the activity of microorganisms in the main tank 10, making water changes unnecessary. Furthermore, since the porous material 12 and the porous material 21 are used, it is possible to secure a place for the microorganisms to settle in the growth tank, and to realize stable activity of the microorganisms.

The embodiments described above are preferred specific examples of the water circulation system according to the present invention, and the technical scope of the present invention is not limited to these aspects. For example, the bubbles generated from the bubble generator may be microbubbles or nanobubbles, and may be switchable. Moreover, the pumps, valves, and the like may be of any type.

10: Main tank (first tank)
11: Storage part 12: Porous material 13: Three-way valve 14: Pump 15: Valve 16: Valve 17: Pump 19: Valve 20: Sub tank (second tank)
21 : Porous material 30 : Bubble generator 31 : Air pipe 40 : Drainage part 41 : Drainage groove 42 : Connection part 43 : Mesh 45 : Water supply part 46 : Replenishment tank 71 : Water pipe 72 : Water pipe 73 : Water pipe 74 : Water pipe 75 : Water pipe 76 : Water pipe 77 : Water pipe 78 : Water pipe 79 : Water pipe 81 : Valve 100 : System

Claims (4)

a first tank;
a second tank provided separately from the first tank;
a porous material installed at the bottom of the first tank and the second tank;
a bubble generator that supplies bubbles to the first tank,
adding a microbial activator and circulating water in the first tank and the second tank;
A water circulation system that adjusts the balance between aerobic and anaerobic microorganisms present in the first tank and the second tank by the action of the microbial activator. The microbial active agent is
The water circulation system according to claim 1, which contains at least amino acids, organic acids, sugars, and vitamins. 3. The water circulation system according to claim 1, wherein a single pump is used to circulate the water stored in the first tank to the bubble generator and the second tank, or to each of them. A reservoir is installed in a part of the bottom of the first tank,
4. The water circulation system according to claim 3, wherein the water drawn from the bottom of the reservoir or the vicinity of the bottom can be supplied to the bubble generator and the second tank, or to each of them.

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