JP2018148872A - Purification system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an open non-circulation type culture system capable of suppressing proliferation (reproduction) of bacteria, and increasing a dissolved oxygen amount in the whole area of a cultivation area.SOLUTION: A part of an open river 1 is set as a cultivation area 2 having a rectangular shape in a plane view, and each discharge device 3 ia arranged respectively on two facing sides 2a, 2b which are parallel to a flow in four sides partitioning the cultivation area 2. By introducing air into each discharge device 3, bubbles having various kind of particle sizes of mm, μm and nm units are formed and intermingled into water. As a result of interminglement, dissolved oxygen is improved greatly.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a system for purifying a part of an open area such as a natural river, pond, or sea.

  As an embodiment of the purification system, a closed circulation culture system that circulates water on the land and breeds it while reusing is widely adopted.

  For example, Patent Document 1 has been proposed by the present inventor. In Patent Document 1, as a closed-circulation aquaculture system, water containing fine bubbles from one corner in a water tank toward the opposite corner is provided. A pump and a nozzle to be sent out are arranged, a paddle mixer for forming a circulating flow in the water tank is arranged in the opposite corner, and a structure in which an antibacterial member carrying nano silver particles is suspended and supported in the water tank. It is disclosed.

  Patent Document 2 discloses a closed-circulation aquaculture system that removes nitrogen components such as ammonia in seawater while circulating seawater, a physical filtration unit that removes solids in seawater, and electrolysis of seawater to activate it. An electrolysis / nitrogen removal unit that generates chlorine species and removes nitrogen components in seawater with this active chlorine species, and a chlorine neutralization unit that neutralizes active chlorine species in this order along the flow direction of seawater Arrangements have been proposed.

  Patent Document 3 proposes a closed circulation type aquaculture system in which a plurality of aquaculture pipes of a predetermined length are connected to form a circulation path, and an observation window is provided to observe the state in the aquaculture pipe. Yes.

  Patent Document 4 proposes an on-shore aquaculture facility for culturing fish and shellfish that includes a physical purification processing means, a biological purification processing means, a chemical purification processing means, and an electrochemical purification processing means.

  Patent Document 5 proposes a nanobubble-based biological fatigue recovery method that recovers fatigue of a living body by bringing water containing nanobubbles into contact with the surface of the living body.

  In Patent Document 6, as a method for purifying water in general water areas such as sea, lakes, rivers, brackish water areas, fluctuating natural energy is stored in the form of compressed air, and the air is forced to craze generated in a polymer resin film. A method has been proposed in which the amount of dissolved oxygen is increased in a state close to nature by permeating it into the water.

  Patent Document 7 proposes a micronization method in which the foaming / condensation process is repeated a plurality of times. In this micronization method, water is brought into contact with the nanosilver particles supported on the ceramic surface, thereby holding the zeta that is retained by the nanosilver particles. It describes that fungi and algae are destroyed and removed by electric potential.

  Patent Document 8 discloses the following basic contents regarding the production of nanobubbles. First, 10-50 μm microbubbles are formed in an aqueous solution having high electrical conductivity mixed with electrolyte ions such as iron ions and sodium ions. Next, by applying physical stimulation to the microbubbles, the microbubbles are rapidly reduced (nanoized) to a diameter of 50 to 500 nm. Since these nano-sized bubbles have shrunk rapidly, the amount of charge per unit area is greatly increased, and electrostatic repulsion of hydrogen ions and hydroxide ions adsorbed on the gas-liquid interface works. It is interpreted that the oxide ion and the electrolyte ion function as a shell surrounding the microbubbles which are concentrated into a minute volume and nanonized as the gas-liquid interface shrinks, and thus exhibit a unique function.

Japanese Patent No. 6092454 JP 2003-27496 A JP 2005-021142 A JP 2014-209899 A JP 2007-045455 A JP 2006-320259 A JP 2014-198333 A Japanese Patent No. 4144669

  The closed-circulation aquaculture system is less affected by external factors such as climate and red tide, is highly productive, and can adjust the water temperature to shorten the cultivation period. While there are advantages such as being less affected and not subject to restrictions on fishery laws such as parcel fishery rights, if a virus, fish disease, etc. are brought into the breeding aquarium, the farmed fish will be annihilated.

  On the other hand, in an open non-circulation aquaculture system that uses rivers and waterways as they are, it is difficult to manage the water quality, and the amount of dissolved oxygen is often insufficient in situations where the water flow rate is slow, which is not suitable for mass production.

Patent Document 1 is applied to a closed water tank, and cannot be applied to an open area such as a river as it is. Further, in Patent Document 1, a pump and a nozzle are provided in only one corner. However, in the present invention, each of two opposing sides among the sides defining the region is inclined toward the other side and does not cancel each other. A plurality of discharge devices for discharging water containing fine bubbles are provided. Since Patent Document 1 forms a flow in a water tank without flow, if a discharge device is also provided at the opposite corner, the flows from the discharge devices cancel each other and a circulation flow cannot be formed.

  In the open non-circulation aquaculture system using the rivers and waterways described in Patent Document 2 to Patent Document 7 as they are, it is difficult to manage the water quality, and the amount of dissolved oxygen is insufficient in the situation where the water flow rate is slow. Often not suitable for. However, none of the above-described prior art documents is effective for purifying an open area using a river or a water channel as it is.

Moreover, in patent document 8, before producing 10-50 micrometers microbubble in water, the electrolyte ion is mixed in the said water. Electrolyte ions act as a shell that surrounds the bubble that is concentrated and nanonized as the gas-liquid interface shrinks when the bubble becomes nano-sized below 500 nm. However, if the amount of electrolyte ion penetration is small, the shell also The period during which the nano-size can be maintained is shortened.

  In order to solve the above problems, the present invention is a system for purifying a part of an open area such as a river, a pond, or the sea, wherein the part of the open area is rectangular in a plan view. A discharge device that discharges water containing fine bubbles in a direction that is oblique to the other side and does not cancel each other out is arranged on each of two opposing sides that define the purification region. The discharge device includes a microbubble generating unit that generates microbubbles having a diameter of 500 nm or more in water, a metal ion adding unit disposed on the downstream side of the microbubble generating unit, and a downstream side of the metal ion adding unit. The metal ion adding portion is a ceramic comprising at least one of an alkali metal oxide, an alkaline earth metal oxide, and an oxide of group 8 to 10 elements. There is filled, the said microbubble reduction unit is configured to channel applying a force to reduce the bubbles were formed.

  An antibacterial member having nano silver particles supported on the surface of the porous member may be disposed in the purification region.

  Further, a paddle mixer that takes air into the water may be disposed in the vicinity of the side that defines the purification region. By doing in this way, the amount of dissolved oxygen can be further increased.

According to the purification system of the present invention, since it is a system that uses open natural water such as rivers, shrimp and fish are not stressed and diseases are not likely to occur. In particular, among the sides that define the purification region in a rectangular shape, water containing fine bubbles is forcibly ejected from one of two opposing sides toward the other, so that the amount of dissolved oxygen can be increased.
In particular, when there is a flow such as a river, the effect is further enhanced because the purified water flows not only in the purification region but also in the downstream region.

The water ejected from the nozzle contains bubbles of various sizes such as nm-size bubbles, μm-size bubbles, and mm-size bubbles, so in addition to the sterilization and sterilization effects, dissolved oxygen over the entire culture area The amount can be kept high.

In addition, fresh water is always supplied to the purification region, but even if a large amount of fungi and algae are contained in the water, it comes into contact with the nano silver particles supported on the surface of the porous member, It is extremely unlikely that fungi and algae will be destroyed and removed, and shrimp and farmed fish will be destroyed. In particular, when a filtration part is provided on the upstream side of the nozzle and an antibacterial member in which nanosilver particles are supported on the surface of the porous member is housed in the filtration part, contact with the nanosilver particles is ensured. The effect is further enhanced.

Plan view of the purification system according to the present invention Configuration diagram of dispensing device Sectional view explaining the structure of the microbubble reduction part Perspective view of filter media Side view of paddle mixer

  In the embodiment shown in FIG. 1, an example applied to a river where a water flow is formed is shown. The present invention is not limited to rivers and can be applied to open areas where water can freely flow in and out, such as ponds, lakes, seas, and waterways.

  In the illustrated example, a part of the opened river 1 is set as a purification region 2 having a rectangular shape in plan view, and two of the four sides that define the purification region 2 are opposed to each other parallel to the flow. Discharge device 3 is arranged in each of sides 2a and 2b.

  The four sides that define the purification region 2 are not formed by walls or plates, but are fictitious lines for determining the position where the discharge device 3 is arranged. A net can be provided to prevent farmed fish from escaping and foreign enemies from entering.

  As shown in FIG. 2, the discharge device 3 has one end of the cylindrical case 1 as an inlet 4 for river water and the other end as an outlet 5 for functional water. In this embodiment, the diameter of the inlet 4 is set larger than the diameter of the outlet 5.

  In the cylindrical case following the inlet 4, a microbubble generator 6 is provided, and the microbubble generator 6 is filled with stainless steel net, stainless wool 7, or the like. Instead of the stainless steel net or stainless steel wool 7, a metal net or a perforated plate may be used.

  A metal ion adding unit 8 is continuously provided downstream of the microbubble generating unit 6. The metal ion adding portion 8 is filled with ceramic particles 9 having a particle diameter of 1 to 10 mm.

  Examples of the ceramic particles 9 include Si oxide and Al oxide as main components, and other components such as alkali metal oxides such as Na and K, alkaline earth metal oxides such as Mg and Ca, Fe, Co, and the like. And oxides of Group 8 to 10 elements such as Ni. In addition, 90-95 wt% of the sum total of Si oxide and Al oxide is preferable. If it is 90 wt% or less, the ceramic becomes brittle and breaks easily.

  The ceramic particles 9 may include an oxide of a transition metal such as Ti or Cr or a non-metal oxide such as P. In order to effectively produce functional water, it is desirable that the content of the alkaline earth metal oxide in the ceramic particles is 25% or more (weight ratio) of the content of the alkali metal oxide. Preferably contains 0.1 to 3% by weight of an oxide of at least one element selected from elements belonging to Group 8 to Group 10 elements.

  A downstream portion of the metal ion adding portion 8 is squeezed and connected to a microbubble reducing portion (nozzle) 10. As shown in FIG. 3, the microbubble reduction part 10 is formed with a plurality of nozzle holes 12 in the partition wall 11, and a linear reduction force action part 13 for guiding the merged jet flow downstream in parallel is provided downstream of the nozzle hole 12. ing. The reducing force acting unit 13 creates an unstable environment such as Kelvin Helmholtz instability, whereby microbubbles are further reduced to a nano size of 500 nm or less.

  As means for applying the reducing force to the microbubbles, ultrasonic waves, high-speed rotation, compression / expansion, etc. as disclosed in Patent Document 8 may be used. However, as in this embodiment, the downstream portion of the metal ion addition unit 6 is used. By providing the microbubble reduction part 8 continuously, nanobubbles can be created without requiring special power.

  As described above, the water introduced from the inlet 4 to the microbubble generator 6 passes between the stainless steel net and the stainless wool 7, whereby micron-sized microbubbles (microbubbles) are formed in the water. Microbubbles are automatically generated by a cavitation phenomenon without sending air separately to the raw water.

  Water mixed with micron-sized microbubbles generated in the microbubble generating unit 6 is introduced into the metal ion adding unit 8 and comes into contact with the ceramic particles to form metal ions from the metal oxide constituting the ceramic in the water. Melts. The concentration of this metal ion is estimated to be high at the gas-liquid interface of the microbubbles.

  Water containing metal ions and micron-sized microbubbles is sent to the microforce acting part 13 of the microbubble reducing part 10 through the nozzle 12, and becomes smaller nanobubbles (50 to 500 nm) and ejects from the outlet 5. .

  In the illustrated example, the microbubble generating unit 6 and the metal ion adding unit 8 are continuously arranged in one container, but each may be separated into another container and connected by piping or the like. Moreover, although the reduction force action part 13 of the microbubble reduction part 8 is a simple linear flow path, a stirring member or the like that promotes nano-ization may be disposed.

  The axis of the microbubble reduction part (nozzle) 10 is set so that the direction of ejection of water mixed with bubbles does not cancel the water ejected from the other side. When water flows from upstream to downstream as in a river, the ejection direction of the nozzle 10 is preferably 90 ° or less with respect to the water flow direction. In this embodiment, water from the discharge device 3 disposed on the side 2a faces the discharge device 3 disposed on the side 2b, and water from the discharge device 3 disposed on the side 2b is disposed on the side 2a. It moves toward the discharged discharge device 3 and forms a continuous meandering movement along the flow.

A predetermined number of filter media 20 are suspended and supported in the purification region 2 at intervals. As shown in FIG. 4, the filter medium 20 has mesh bags 22 containing porous members obtained by finely pulverizing lava and the like attached to both surfaces of a plate material 21, and these are connected by strings 23. Nanosilver particles are supported on the surface of the porous member in the same manner as the porous member filled in the filtration unit 8 described above.

The structure of the filter medium 20 is not limited to the above, and any structure that can effectively sterilize and purify the water flowing through the purification region 2 in an efficient contact with the filter medium 20 may be used.

A paddle mixer 24 is provided on the sides 2 a and 2 b that define the purification region 2. In the embodiment, it is arranged adjacent to the downstream of the discharge device 3, but the place to arrange is not limited to this.

As shown in FIG. 5, the paddle mixer 24 has a plurality of blades 26 attached to a shaft 25 orthogonal to the sides 2 a and 2 b, and the air (oxygen) is taken into the water by the rotation of the blades 26.

  The purification system according to the present invention is not limited to the cultivation of shrimp, various fish, and aquatic plants that require oxygen, but can also be used for water purification itself.

  DESCRIPTION OF SYMBOLS 1 ... River, 2 ... Purification | cleaning area | region, 2a, 2b ... Side which divides purification | cleaning area | region 3 ... Discharge apparatus, 4 ... Inlet of discharge apparatus, 5 ... Outlet of discharge apparatus, 6 ... Microbubble generation part, 7 ... Stainless steel wool 8 ... Metal ion addition part, 9 ... Ceramic particles, 10 ... Microbubble reduction part, 11 ... Partition, 12 ... Nozzle hole, 13 ... Reduction force action part, 20 ... Filter material, 21 ... Plate material, 22 ... Mesh bag, 23 ... string, 24 ... paddle mixer, 25 ... shaft, 26 ... blade.

Claims (4)

  A system for partially purifying open areas such as rivers, ponds, and seas, wherein a part of the open area is set as a purification area having a rectangular shape in plan view, and the purification area is partitioned. A discharge device that discharges water containing fine bubbles is arranged in each of two opposite sides of the side in a direction that is oblique to the other side and does not cancel each other, and the discharge device has a diameter of 500 nm or more in water. Consisting of a microbubble generating part for generating a microbubble, a metal ion adding part arranged on the downstream side of the microbubble generating part, and a microbubble reducing part arranged on the downstream side of the metal ion adding part, The metal ion addition part is filled with a ceramic made of at least one of an alkali metal oxide, an alkaline earth metal oxide, and an oxide of group 8 to 10 elements, and the microbubble reduction part is Purification system wherein the flow path for applying a force to reduce the bubbles are formed.   The purification system according to claim 1, wherein an antibacterial member having nano silver particles supported on the surface of a porous member is disposed in the purification region.   The purification system according to claim 1, wherein a paddle mixer that takes air into water is disposed in the vicinity of the two opposing sides.   4. The purification system according to claim 1, wherein a part of the opened area is used for aquaculture.