JP6127196B1 - Functional water production apparatus and production method - Google Patents

Abstract

An apparatus capable of producing functional water containing nano-sized bubbles by a simple operation is provided. The raw material water introduced from the inlet 2 into the microbubble generator 4 passes between the stainless steel net and the stainless wool, and micron-sized microbubbles are mixed therein. Water mixed with micron-sized microbubbles generated in the microbubble generating unit 4 is introduced into the metal ion adding unit 6 and comes into contact with the ceramic particles 7 to form metal from the metal oxide constituting the ceramic in water. Ions melt [selection figure] Fig. 1

Description

  The present invention relates to an apparatus and method for producing functional water containing nanobubbles.

  Nanobubbles (bubbles) with a diameter of 500 nm or less can stay in water for more than a month, and exhibit characteristics different from normal size bubbles such as bactericidal effect and reaction with organic or inorganic substances. Is expected to be used.

Examples of the prior art related to the nanobubble include those disclosed in Patent Documents 1 to 4.
Patent document 1 is disclosing the basic content regarding manufacture of a nano bubble. 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.

  As physical stimulation for further reducing the microbubbles mentioned in Patent Document 1 to nano-size, ultrasonic waves with a frequency of 20 kHz to 1 MHz, rotational force of 500 to 10,000 rpm, passing through an orifice or a perforated plate Compression, expansion and vortex are mentioned.

  In Patent Document 2, the object to be refined is not oil bubbles but cutting oil, but as a refinement procedure, the cutting oil is brought into contact with the anti-fluorite and stirred, and further collided to refine the particles of the cutting oil. It is disclosed.

  Patent Document 3 discloses an emulsion fuel production apparatus in which a metal mesh block is arranged on the upstream side in a cylindrical case having openings at both ends, ceramic particles are arranged on the downstream side, and water molecules and oil flow particles are made nano-sized. The content to make small is proposed.

  Patent Document 4 proposes a structure in which turbulent flow generating means and ceramics are filled in a cylindrical case having openings at both ends as an apparatus for refining processing oil.

Japanese Patent No. 4144669 JP 2011-174064 A JP 2010-64009 A JP-A-2005-232218

  In patent document 1, 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.

  Patent Documents 2 to 4 disclose a technique for making the liquid nano-sized, but do not suggest any increase in the concentration of electrolyte ions at the gas-liquid interface.

In order to solve the above-described problems, the functional water production apparatus according to the present invention includes a microbubble generating unit that generates microbubbles having a diameter of 500 nm or more in water, and metal ion addition disposed downstream of the microbubble generating unit. And a microbubble reduction part disposed downstream of the metal ion addition part. The metal ion addition part includes an alkali metal oxide, an alkaline earth metal oxide, Group 8-10. A ceramic made of at least one of elemental oxides was filled, and a flow path for applying a force for reducing the bubbles was formed in the microbubble reduction portion.

  In addition, the method for producing functional water according to the present invention generates microbubbles having a diameter of 500 nm or more in water by passing water through a microbubble generator filled with mesh or fiber, and the water containing the microbubbles is converted to an alkali metal. The metal ions are dissolved by contacting with a ceramic composed of at least one of oxides of oxides, alkaline earth metal oxides, and oxides of group 8 to 10 elements, and water containing the metal ions and microbubbles is dissolved. A force for reducing the microbubbles in the water while being ejected from the nozzle was applied to form nanosized bubbles having a diameter of less than 500 nm.

According to the functional water production apparatus and production method according to the present invention, after microbubbles having a diameter of 500 nm or more are generated in water, the water containing the microbubbles is brought into contact with a ceramic such as a metal oxide. When the concentration of metal ions dissolved in water increases near the gas-liquid interface of the microbubbles, and when the microbubbles are further reduced to nanosize, the shell formed around the bubbles becomes stronger, and the Over time, nano-sized bubbles are maintained in the water.

Moreover, if the microbubble generation part, metal ion addition part, and microbubble reduction part which comprise a manufacturing apparatus are arrange | positioned in series in one cylindrical case, the raw material water will be put in from one opening and taken out from the other opening. Functional water can be produced with just a simple operation.

The figure which fractured | ruptured and showed the part of the functional water manufacturing apparatus which concerns on this invention Sectional drawing explaining the structure of the microbubble reduction part of the manufacturing apparatus of the functional water which concerns on this invention

  In an example of the manufacturing apparatus according to the present invention, one end of the cylindrical case 1 is used as the raw material water inlet 2 and the other end is used as the functional water outlet 3. In this embodiment, the diameter of the inlet 2 is set larger than the diameter of the outlet 3. In addition, raw water pressurized by a pump or the like is fed into the inlet 2.

  A microbubble generator 4 is provided in the cylindrical case 1 following the inlet 2, and the microbubble generator 4 is filled with stainless steel net, stainless wool 5 or the like. Instead of the stainless steel net or stainless wool 5, a metal net or a perforated plate may be used.

  A metal ion adding unit 6 is continuously provided downstream of the microbubble generating unit 4. The metal ion adding portion 6 is filled with ceramic particles 7 having a particle diameter of 1 to 10 mm.

  Examples of the ceramic particles 7 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 7 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.

  The downstream part of the metal ion addition part 6 is squeezed and connected to the microbubble reduction part 8. As shown in FIG. 2, the microbubble reduction part 8 is formed with a plurality of nozzle holes 10 in the partition wall 9, and a linear reduction force acting part 11 that guides the merged jet flow downstream in parallel is provided downstream of the nozzle hole 10. ing. In the reducing force acting part 11, by creating an unstable environment such as Kelvin Helmholtz instability, microbubbles are further reduced to a nano size of 500 nm or less.

  The means for applying a reducing force to the microbubbles may be ultrasonic waves, high-speed rotation, compression / expansion as disclosed in Patent Document 1, but as in this embodiment, the downstream portion of the metal ion addition unit 6 By providing the microbubble reduction part 8 continuously, nanobubbles can be created without requiring special power.

  As described above, the raw water introduced from the inlet 2 to the microbubble generator 4 passes between the stainless steel net and the stainless wool 5, so that 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 4 is introduced into the metal ion adding unit 6 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 unit 10 of the microbubble reducing unit 8 through the nozzle 9 and is further ejected from the outlet 3 as nanobubbles (50 to 500 nm). .

  In the illustrated example, the microbubble generating unit 4 and the metal ion adding unit 6 are continuously arranged in one container, but each may be separated into another container and connected by piping or the like. Moreover, although the reducing force action part 11 of the microbubble reducing part 8 is a simple linear flow path, a stirring member or the like that promotes nano-ization may be arranged.

  The water used as a raw material in the present invention may be tap water, distilled water, or the like, and it is not necessary to adjust the electrical conductivity and pH required for the water used as the raw material for nanobubble water described in Patent Document 1. In order to effectively produce functional water, it is desirable to introduce water as a raw material at a flow rate of 1 to 300 cm / second and a water pressure of 0.1 to 5 MPa, a flow rate of 10 to 100 cm / second, and 0. It is more desirable to introduce at a water pressure of 5 to 3 MPa.

  The introduction of water as a raw material into the functional water production apparatus may be a one-pass type or a circulation type. The water used as a raw material may be a hardly decomposable organic waste water. For example, when water that is made from persistent organic wastewater is used as a raw material and is introduced into the functional water production equipment as a circulation system, the functional water generated from the persistent organic wastewater is converted into the persistent organic system contained in the wastewater. The waste water can be purified by decomposing the waste water.

  According to the study of the present inventors, the functional water produced by the present invention is nanobubble water (for example, water containing nanobubbles having a particle size of 50 to 500 nm), as in Patent Document 1. This is measured using an electron spin resonance apparatus (ESR) for a solution prepared by adding DMPO (5,5-dimethyl-1-pyrroline N-oxide) as a spin trap agent to the obtained functional water. This is supported by the fact that the spectrum of DMPO-OH, which is a spin adduct caused by the presence of nanobubbles, is observed.

  As described above, in order to produce nanobubbles by the method described in Patent Document 1, it is necessary to adjust the electrical conductivity by adding an electrolyte to water as a raw material in the step before forming microbubbles. It is necessary to give physical stimulation such as ultrasonic waves to the microbubbles that become nanobubbles. However, the method of the present invention does not require a step of adjusting the electrical conductivity of water as a raw material, and nanobubble water is produced even when water having an electrical conductivity of, for example, 1.5 μS / cm or less is used as a raw material. be able to.

  In the present invention, water containing microbubbles generated by cavitation or the like is led to a metal ion addition part filled with a granular ceramic containing an alkali metal oxide, an alkaline earth metal oxide, an oxide of a group 8-10 element, Metal ions are dissolved in water containing microbubbles in contact with the granular ceramic. As a result, the concentration of dissolved metal ions at the gas-liquid interface of the microbubbles is increased, and it is assumed that the formation of nanobubbles from the microbubbles and the stabilization due to the salting-out effect of the generated nanobubbles proceed. The

  The order of the above is reversed, and the functional water (nano bubble water) of the present invention cannot be obtained even if the water previously irradiated with ultrasonic waves as a physical stimulus is guided to the metal ion addition part. It is important to create microbubbles in advance as pretreatment for guiding.

  Since the functional water according to the present invention maintains nano-sized bubbles for a long period of time, it is diluted with coolant oil for sterilization, aquaculture, and cutting of metal materials, purified water for persistent organic wastewater, cosmetics and beverages It can be applied in many fields, not limited to water.

  DESCRIPTION OF SYMBOLS 1 ... Cylindrical case, 2 ... Raw material water inlet, 3 ... Functional water outlet, 4 ... Micro bubble generation part, 5 ... Stainless steel net and stainless wool, 6 ... Metal ion addition part, 7 ... Ceramic particle, 8 ... Micro Bubble reduction part, 9 ... partition, 10 ... nozzle hole, 11 ... reduction force action part.

Claims (2)

  A micro-bubble generating unit that generates micro-bubbles having a diameter of 500 nm or more in water, a metal ion adding unit arranged on the downstream side of the micro bubble generating unit, and a micro-bubble reduction arranged on the downstream side of the metal ion adding unit The metal ion addition portion is filled with a ceramic made of at least one of an oxide of an alkali metal, an oxide of an alkaline earth metal, and an oxide of a group 8-10 element, and the microbubbles An apparatus for producing functional water, wherein a flow path for applying a force for reducing bubbles is formed in the reduction portion. By passing water through a microbubble generator filled with mesh or fiber, microbubbles having a diameter of 500 nm or more are generated in the water, and the water containing the microbubbles is converted into alkali metal oxide, alkaline earth metal oxide, Metal ions are dissolved by contacting with a ceramic composed of at least one of oxides of Group 8 to 10 elements, and water containing the metal ions and microbubbles is ejected from the nozzle and reduced to microbubbles in the water. A method for producing functional water, wherein force is applied to form nano-sized bubbles having a diameter of less than 500 nm.