US20170072408A1 - Ultrafine bubble cleaning method using ultrafine bubble-containing liquid, apparatus therefor, and dissolved air floatation apparatus - Google Patents

Ultrafine bubble cleaning method using ultrafine bubble-containing liquid, apparatus therefor, and dissolved air floatation apparatus Download PDF

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US20170072408A1
US20170072408A1 US15/125,337 US201515125337A US2017072408A1 US 20170072408 A1 US20170072408 A1 US 20170072408A1 US 201515125337 A US201515125337 A US 201515125337A US 2017072408 A1 US2017072408 A1 US 2017072408A1
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liquid
ultrafine
bubbles
substance
ultrafine bubble
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Toshikatsu Suzuki
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PCS Co Ltd
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PCS Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0084—Enhancing liquid-particle separation using the flotation principle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
    • B01D21/267—Separation of sediment aided by centrifugal force or centripetal force by using a cyclone
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B01J20/205—Carbon nanostructures, e.g. nanotubes, nanohorns, nanocones, nanoballs
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    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28042—Shaped bodies; Monolithic structures
    • B01J20/28045—Honeycomb or cellular structures; Solid foams or sponges
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    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
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    • B03D1/14—Flotation machines
    • B03D1/1418—Flotation machines using centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1431—Dissolved air flotation machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1456—Feed mechanisms for the slurry
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1462—Discharge mechanisms for the froth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1475—Flotation tanks having means for discharging the pulp, e.g. as a bleed stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/04—Treating liquids
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
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    • G—PHYSICS
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    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/04—Treating liquids
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    • G21F9/12—Processing by absorption; by adsorption; by ion-exchange
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/28—Treating solids
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    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
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    • B01J2220/46—Materials comprising a mixture of inorganic and organic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/49—Materials comprising an indicator, e.g. colour indicator, pH-indicator
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/00—Treatment of water, waste water, or sewage
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/08—Nanoparticles or nanotubes

Definitions

  • the present invention relates to an ultrafine bubble cleaning method using ultrafine bubbles, an apparatus therefor, and a dissolved air floatation apparatus.
  • a dissolved air floatation apparatus is an apparatus in which solid-liquid separation is performed by attaching fine bubbles to a substance that is suspended in water to decrease the apparent specific gravity.
  • this apparatus for example, when air is added to water, dissolved in water under pressure, and then released at atmospheric pressure, generated fine bubbles are adhered to the suspended substance in water, and float with the suspended substance to the surface of the water. Water except for a floating substance collected by skimmer or the like becomes treated water.
  • Patent Literature 1 describes a case where air is added to water, and that air bubbles with a diameter of several hundreds nm or less, referred to as nanobubbles, are used. However, in fact, the minimum value is estimated to be 100 nm.
  • Patent Literature 1 Japanese Patent Application Laid-Open No. 2010-162518
  • the present inventor has intensively studied, and as a result, completed an ultrafine bubble cleaning method using an ultrafine bubble-containing liquid containing ultrafine bubbles having a size of less than 30 nm and 3 ⁇ or more, an apparatus therefor, and a dissolved air floatation apparatus.
  • An ultrafine bubble cleaning method for cleaning a substance to be cleaned comprising: stirring an ultrafine bubble-containing liquid in which the substance to be cleaned, such as soil, sand, stone, fallen leaves, rubble, boards, and sheets, is added to the ultrafine bubble-containing liquid containing ultrafine bubbles having a size of 3 ⁇ or more and less than 30 nm that is stored in a reservoir, such as a water tank and a pond, washing off fine particles adhered to the substance to be cleaned while causing the fine particles to be adsorbed on an interface of the ultrafine bubbles, causing the fine particles to be floated as a floated and separated substance, and causing the substance to be cleaned in which the fine particles are rinsed off to be settled as sedimentation isolates; and discharging a supernatant containing the floated and separated substance.
  • a reservoir such as a water tank and a pond
  • ultrafine bubble-containing liquid When the ultrafine bubble-containing liquid is stirred, ultrafine bubbles get into an internal of the substance to be cleaned, such as soil and sand with a radioactive substance adhered thereto, or a space between the substance and the adhered substance, adhered to fine particles such as cesium getting into or adhered to the soil and sand, and discharged outside. As a result, the fine particles adhered to the substance to be cleaned are cleaned off.
  • the fine particles with the ultrafine bubbles adhered thereto are floated as a floated and separated substance to a surface of the liquid, and soil and sand to which ultrafine bubbles are not adhered are settled as sedimentation isolates at the bottom of a reservoir.
  • the fine particles with adhered bubbles that are larger than the ultrafine bubbles are intended to be settled because the bubbles are broken during floating.
  • ultrafine bubbles are adhered to the fine particles to cause them to float.
  • the sedimentation isolates hardly contain cesium etc. Therefore, when a supernatant containing the floated and separated substance is discharged, the sedimentation isolates can be returned to the earth. It should be noted that cleaning may be repeated a plurality of times until cesium etc. are separated.
  • a cleaning method for oil contaminated water comprising: mixing an ultrafine bubble-containing liquid containing ultrafine bubbles having a size of 3 ⁇ or more and less than 30 nm in raw water in which fine droplets of an organic substance, such as crude oil and insulating oil, are dispersed, and stirring the mixture to attach ultrafine bubbles to the fine droplets, and float and separate the fine droplets due to buoyancy of the ultrafine bubbles.
  • an organic substance such as crude oil and insulating oil
  • the organic substance is adsorbed to bubbles.
  • the bubbles are fine bubbles, the bubbles are very likely to come into contact with the fine droplets dispersed in raw water.
  • the ultrafine bubbles can be allowed to be adhered to most of the fine droplets, and the buoyancy of the ultrafine bubbles can cause the fine droplets to be floated and separated from the raw water.
  • An ultrafine bubble cleaning apparatus comprising:
  • a reservoir such as a water tank and a pond, in which an ultrafine bubble-containing liquid containing ultrafine bubbles having a size of 3 ⁇ or more and less than 30 nm is stored and a substance to be cleaned, such as soil, sand, fallen leaves, and rubble, can be contained in the stored liquid;
  • a stirring device that is provided in the reservoir and configured to stir the liquid stored thereinside;
  • a supernatant discharging device configured to discharge, of a floated and separated substance that is adsorbed on an interface of ultrafine bubbles in the ultrafine bubble-containing liquid and sedimentation isolates that are not adsorbed, a supernatant containing the floated and separated substance after precipitation of the sedimentation isolates;
  • a sedimentation extraction device configured to extract the sedimentation isolates.
  • An ultrafine bubble cleaning apparatus comprising: a reservoir, such as a water tank and a pond, configured to be capable of containing raw water in which fine droplets of an organic substance, such as oil and insulating oil, are dispersed; an ultrafine bubble-containing water supply device configured to supply an ultrafine bubble-containing water containing ultrafine bubbles having a size of 3 ⁇ or more and less than 30 nm to raw water of the reservoir; a stirring device that is provided in the reservoir and configured to stir the raw water stored thereinside; and a floated substance and liquid discharging device configured to discharge fine droplets that are adsorbed on an interface of ultrafine bubbles in the ultrafine bubble-containing liquid and floated by the stirring.
  • a reservoir such as a water tank and a pond, configured to be capable of containing raw water in which fine droplets of an organic substance, such as oil and insulating oil, are dispersed
  • an ultrafine bubble-containing water supply device configured to supply an ultrafine bubble-containing water containing ultrafine bubbles having a
  • a dissolved air floatation apparatus comprising: a dissolved air floatation tank provided with an inlet at one end, wherein a pressurized ultrafine bubble-containing liquid containing ultrafine bubbles having a size of 3 ⁇ or more and less than 30 nm is mixed in a raw liquid and is poured into the dissolved air floatation tank from the inlet to cause a suspended substance and a dissolved component in the raw liquid to be adsorbed on an interface of ultrafine bubbles and be floated in the dissolved air floatation tank, and the suspended substance and the dissolved component are extracted as a suspended and separated substance from the raw liquid, and a remaining raw liquid is discharged as a treated liquid, the dissolved air floatation apparatus comprising:
  • a circulating device configured to circulate a mixed liquid of the raw liquid and the ultrafine bubble-containing liquid in the dissolved air floatation tank;
  • a floated and separated substance collecting device configured to extract a floated and separated substance that is floated to a liquid surface by ultrafine bubbles contained in the ultrafine bubble-containing liquid in the dissolved air floatation tank.
  • the liquid is not limited to water, and may be alcohols, seawater, or oils.
  • the gas is not limited to air, and may be oxygen, hydrogen, nitrogen, carbon dioxide gas, rare gas, or methane gas.
  • the present invention has an effect that can clean the aforementioned soil and sand, rubble, etc. with an ultrafine bubble-containing liquid containing ultrafine bubbles that are also adhered to small particles that cannot be conventionally floated by bubbles having a size of 30 nm or more and cause the particles to float.
  • FIG. 1 is a cross-sectional view schematically showing an ultrafine bubble cleaning apparatus according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view schematically showing a modified example of the ultrafine bubble cleaning apparatus.
  • FIG. 3 is a plan view schematically showing a modified example of the ultrafine bubble cleaning apparatus.
  • FIG. 4 is a flow chart showing a process of cleaning a substance to be cleaned by the modified example.
  • FIG. 5 is a pipe line view schematically showing a dissolved air floatation apparatus according to a second embodiment of the present invention.
  • FIG. 6 is a front view partially including a cross-sectional view, showing the dissolved air floatation apparatus.
  • FIG. 7 is a plan view of the dissolved air floatation apparatus.
  • FIG. 8 is a side view of the dissolved air floatation apparatus.
  • FIG. 9 is a block diagram schematically showing a flocculant reaction device in the dissolved air floatation apparatus.
  • FIG. 10 is a front view showing an ultrafine bubble-containing liquid production device used in the first and second embodiments of the present invention.
  • FIG. 11 is a front view partially including a cross-sectional view, showing a gas-liquid mixing unit in the production device on an enlarged scale.
  • FIG. 12 is a cross-sectional view showing a nozzle of the gas-liquid mixing unit on an enlarged scale.
  • FIG. 13 is a side view showing a device for making a swirling flow by a fixed blade mounted on the nozzle.
  • FIG. 14 is a front view partially including a cross-sectional view, showing a device for separating a bubble-containing liquid that constitutes part of the ultrafine bubble-containing liquid production device.
  • FIG. 15 is a cross-sectional view taken along line XV-XV of FIG. 14 .
  • FIG. 16 is a flow chart showing another example of a method for confirming the presence of ultrafine bubbles.
  • FIG. 17 is a pipe line view showing a modified example of the ultrafine bubble-containing liquid production device.
  • an ultrafine bubble cleaning apparatus 80 is configured to include a water tank-shaped reservoir 82 , a stirring device 84 for stirring a liquid in the reservoir 82 , the stirring device 84 being disposed at the center of the reservoir 82 , a supernatant discharge device 85 including a pump for discharging a supernatant of the liquid in the reservoir 82 , and a sedimentation extraction device 86 for extracting sedimentation isolates that have been settled at the bottom of the reservoir 82 .
  • a substance-to-be-cleaned loading device 87 is disposed on a side opposite to the sedimentation extraction device 86 in the reservoir 82 , and is configured to load the substance to be cleaned such as soil, sand, fallen leaves, rubble, boards, and sheets into the reservoir 82 .
  • the supernatant discharge device 85 includes a pump 85 A for sucking the supernatant of the liquid in the reservoir 82 and a floated and separated substance collecting device 85 B for removing a floated and separated substance from the supernatant containing the floated and separated substance that is sucked by the pump 85 A.
  • the supernatant after removal of the floated and separated substance by the floated and separated substance collecting device 85 B is returned to the reservoir 82 .
  • a cleaned substance extracted by the sedimentation extraction device 86 is loaded into a hopper 88 , and water is drained at the hopper 88 . After that, for example, the cleaned substance is discharged outside by a dump truck or a power shovel, or returned to its original place.
  • An ultrafine bubble-containing liquid supplied to the reservoir 82 is produced, for example, by an ultrafine bubble-containing liquid production device 10 (see FIG. 10 ) described below, stored in a tank 89 A, and supplied to the reservoir 82 by a pump 89 B.
  • the substance to be cleaned such as soil and sand is loaded into the ultrafine bubble-containing liquid stored in the reservoir 82 by the substance-to-be-cleaned loading device 87 , and the ultrafine bubble-containing liquid is repeatedly brought into contact with a surface of the substance to be cleaned using the stirring device 84 .
  • the ultrafine bubbles are adhered to the substance to be cleaned and the fine particles again, the ultrafine bubbles do not have buoyancy of floating the substance to be cleaned, and the fine particles are only floated.
  • the floated fine particles are the floated and separated substance.
  • the rest includes the sedimentation isolates, and is deposited at the bottom of the reservoir 82 .
  • the floated and separated substance collecting device 85 B is configured, for example, by a dissolved air floatation apparatus according to a second embodiment described below.
  • a dissolved air floatation apparatus according to a second embodiment described below.
  • the floated and separated substance with the ultrafine bubbles adhered thereto is incorporated into a flocculant or the ultrafine bubbles are adhered to a flocculant with the fine particles incorporated therein, the floated and separated substance or the flocculant is floated and separated.
  • the rest is treated water, and is returned to the reservoir 82 as a cleaning liquid.
  • the sedimentation isolates are deposited at the bottom of the reservoir 82 , and extracted by the sedimentation extraction device 86 , for example, a power shovel, and loaded into the external hopper 88 .
  • the sedimentation isolates After water is drained at the hopper 88 , the sedimentation isolates are transported by a dump truck or the like. However, the ultrafine bubble-containing liquid adhered to the sedimentation isolates are lost during draining at the hopper 88 . Therefore, the stored ultrafine bubble-containing liquid is supplied to the reservoir 82 from the tank 89 A by the pump 89 B.
  • the dosage of radiation of soil having a dosage of radiation of 3,000 bq/kg as a sample 2 was decreased to 240 bq/kg after cleaning, that of soil having a dosage of radiation of 2,500 bq/kg as a sample 3 was decreased to 210 bq/kg, and that of soil having a dosage of radiation of 2,200 bq/kg as a sample 4 was decreased to 980 bq/kg. Furthermore, that of fallen leaves having a dosage of radiation of 8,700 bq/kg as a sample was decreased to 5,400 bq/kg.
  • the soils as the samples 1 to 4 were further cleaned for 10 minutes.
  • the dosages of radiation thereof were each 100 bq/kg or less.
  • the substance to be cleaned is subjected to batch processing.
  • the present invention is not limited to the batch processing, and continuous processing may be performed.
  • FIGS. 2 and 3 show an ultrafine bubble cleaning apparatus 90 as a modified example capable of performing the continuous processing.
  • the ultrafine bubble cleaning apparatus 90 is configured such that the reservoir includes a first small reservoir 92 A and a second small reservoir 92 B that are arranged in parallel and elongated, the substance to be cleaned is primarily cleaned at the first small reservoir 92 A, then transferred to the second small reservoir 92 B, and secondarily cleaned (rinsed) there, and the ultrafine bubble-containing liquid for cleaning is allowed to flow into the first small reservoir 92 A after the secondary cleaning at the second small reservoir 92 B to be used for the primary cleaning.
  • the primary cleaning is performed at the first small reservoir 92 A
  • the secondary cleaning is performed at the second small reservoir 92 B
  • the ultrafine bubble-containing liquid during the secondary cleaning is supplied to the second small reservoir 92 B from the tank 89 A through the pump 89 B.
  • the ultrafine bubble-containing liquid is supplied to the first small reservoir 92 A as overflow water
  • the substance to be cleaned loaded by the substance-to-be-cleaned loading device 87 is primarily cleaned and discharged by the supernatant discharge device 85 . Since the ultrafine bubble-containing liquid and the substance to be cleaned are processed in a so-called countercurrent cleaning mode, the substance is efficiently cleaned.
  • the same reference numerals in FIG. 1 are given to the same parts as components in the ultrafine bubble cleaning apparatus 80 as shown in FIG. 1 , and a description thereof is omitted.
  • the first and second small reservoirs 92 A and 92 B are ponds dug in the ground.
  • a dump trunk is used as the substance-to-be-cleaned loading device 87 .
  • a power shovel is used as the sedimentation extraction device 86 or a device for extracting a sediment after the primary cleaning in the first small reservoir 92 A and loading the sediment into the second small reservoir 92 B that is adjacent to the first small reservoir 92 A. The power shovel is used not only for shifting the substance to be cleaned in the ponds but also for stirring.
  • a water permeable crushed stone subgrade 95 is provided within a range of motion of the above-described power shovel and dump trunk.
  • Reference numeral 97 in FIG. 2 shows an overflow path in which a cleaning liquid is allowed to flow to the first small reservoir 92 A when the liquid level of the second small reservoir 92 B is constant.
  • Reference numeral 98 in FIG. 3 shows a breakwater that is disposed so as to surround the pump 85 A on a side of loading the substance to be cleaned and a baffle plate for preventing the inflow of a large amount of bubbles in the first small reservoir 92 A.
  • an aggregation reaction tank 85 C in which a flocculant for capturing fine particles contained in supernatant water from the first small reservoir 92 A is added is provided.
  • the ultrafine bubble-containing liquid (hereinafter referred to as cleaning liquid) is poured into the second small reservoir 92 B.
  • this cleaning liquid passes through the overflow path 97 and is poured into the first small reservoir 92 A (see Step 101 ).
  • an overflow liquid (overflow cleaning liquid) is poured into the first small reservoir 92 A through the overflow path 97 while the cleaning liquid is poured.
  • the substance to be cleaned is loaded into the first small reservoir 92 A by substance-to-be-cleaned loading device 87 while the cleaning liquid is stirred.
  • Step 103 while the overflow cleaning liquid from the second small reservoir 92 B is poured into the first small reservoir 92 A, it is stirred by a first stirring device 94 A, and the cleaning liquid after primary cleaning is discharged by the supernatant discharge device 85 .
  • the cleaning liquid may be stirred also during loading of the substance to be cleaned not only by the first stirring device 94 A but also by the substance-to-be-cleaned loading device 87 .
  • Step 104 while the substance to be cleaned is loaded, the cleaned substance after the primary cleaning is extracted by the power shovel from an end portion of the first small reservoir 92 A on a side opposite to the side of loading the substance. Then, the power shovel is traveled on the water permeable crushed stone subgrade 95 , and the cleaned substance is loaded into one end of the second small reservoir 92 B as a substance to be cleaned for secondary cleaning (see Step 203 ).
  • Step 203 the substance to be cleaned after being rinsed is extracted by the power shovel.
  • Steps 102 to 103 , 104 , 202 , and 203 described above are repeated.
  • all the operations are ended (see Steps 105 and 204 ).
  • FIG. 4 details of description of the aggregation reaction tank 85 C constituting the supernatant discharge device 85 and the floated and separated substance collecting device 85 B are omitted.
  • a subject to be cleaned according to the present invention is not solid, for example, when from raw water in which fine droplets of an organic substance such as crude oil and insulating oil are dispersed, the fine droplets are separated, the raw water is poured into the reservoir 82 from the substance-to-be-cleaned loading device 89 in the ultrafine bubble cleaning apparatus 80 of FIG. 1 , and the sedimentation extraction device 86 is not used.
  • the ultrafine bubble-containing water is poured into the raw water in the reservoir 82 , ultrafine bubbles are adhered to the fine droplets by stirring by the stirring device 84 , and the fine droplets are floated and separated from the raw water due to the buoyancy.
  • the organic substance is adhered to bubbles.
  • the bubbles are ultrafine bubbles, the bubbles are very likely to come into contact with the fine droplets dispersed in the raw water.
  • the ultrafine bubbles are allowed to be adhered to most of the fine droplets, and as a result, the fine droplets can be floated and separated from the raw water due to the buoyancy of the ultrafine bubbles.
  • the above-described embodiment is related to cleaning of soil and sand containing radioactive cesium.
  • the present invention is not limited to the embodiment.
  • the subject to be cleaned may be fallen leaves, rubble, boards, or sheets, in addition to soil, sand, and stone.
  • a subject to be cleaned and collected is applied to a case where fine particles as a waste material, for example, an ore and a fragment with metal micro particles adhered are cleaned, and the metal micro particles that cannot be conventionally collected is cleaned off and collected.
  • the dissolved air floatation apparatus 100 includes a dissolved air floatation tank 102 provided with an inlet 101 A at one end.
  • the ultrafine bubble-containing liquid is mixed with a raw liquid (for example, radioactive substance and contaminated water) as a subject to be cleansed, and the mixed liquid is poured into the dissolved air floatation tank 102 from the inlet 101 A.
  • a suspended substance and a dissolved component in the raw liquid are adsorbed on an interface of ultrafine bubbles, and caused to be floated, thereby being separated from the raw liquid and extracted.
  • the remaining raw liquid is discharged as a treated liquid.
  • the dissolved air floatation apparatus 100 has a circulating device 103 that circulates the mixed liquid of the raw liquid and the ultrafine bubble-containing liquid in the dissolved air floatation tank 102 , and a separated substance extracting device 104 that extracts scum floated on a liquid surface of the ultrafine bubble-containing liquid in the dissolved air floatation tank 102 .
  • the circulating device 103 is composed of a swirling discharge pipe 103 A, a swirling flow guide 103 B, and a gap 103 C.
  • the swirling discharge pipe 103 A is provided on an end portion (in the drawing, left end portion) of the dissolved air floatation tank 102 so as to be projected.
  • a tip of the swirling discharge pipe 103 A is curved diagonally upward, and a tip opening thereof serves as the inlet 101 A.
  • the swirling discharge pipe 103 A has a curved pipe shape with which the mixed liquid of the raw liquid and the ultrafine bubble-containing liquid is jetted diagonally upward, and is configured to jet the mixed liquid as a swirling flow by a fixed fin in the dissolved air floatation tank 102 .
  • the swirling flow guide 103 B surrounds the swirling discharge pipe 103 A, and is a cylindrical body that guides a swirling flow discharged from the swirling discharge pipe 103 A diagonally upward and has an opening at the top and bottom.
  • the swirling flow guide 103 B is disposed so as to guide a swirling flow jetted from the inlet 101 A diagonally forward.
  • the gap 103 C is provided between a lower end opening of the swirling discharge pipe 103 A and the bottom of the dissolved air floatation tank 102 so that the swirling flow circulated in the dissolved air floatation tank 102 flows from the lower end opening into the swirling discharge pipe 103 A.
  • the dissolved air floatation apparatus 100 has the separated substance extracting device 104 for extracting scum floated on the liquid surface in the dissolved air floatation tank 102 .
  • the remaining liquid after the floated scum was extracted is discharged as a treated liquid from an discharge opening 101 B.
  • the discharge opening 101 B is connected to a pressurization pump 56 through an inflow pipe 52 in an ultrafine bubble-containing liquid production device 10 .
  • ultrafine bubbles are added by the ultrafine bubble-containing liquid production device 10 , and the liquid is separated into a liquid containing larger bubbles and a liquid containing ultrafine bubbles by a bubble-containing liquid separation device 60 .
  • the ultrafine bubble-containing liquid is pressurized and passes through a pressurized liquid pipe 106 , and is added to raw water, in which a flocculant has been added, discharged from a flocculant reaction tank device 105 is added.
  • the ultrafine bubble-containing liquid then flows as the swirling flow from the inlet 101 A into the dissolved air floatation tank 102 .
  • the gap 103 C is formed between the swirling flow guide 103 B and the bottom face of the dissolved air floatation tank 102 .
  • the liquid in the dissolved air floatation tank 102 can flow from the lower end opening of the swirling flow guide 103 B therethrough.
  • the sedimentation isolates are settled on the bottom face of the dissolved air floatation tank 102 .
  • the sedimentation isolates are also sucked from the gap 103 C to the swirling flow guide 103 B, and circulated in the dissolved air floatation tank 102 together with the swirling flow from the swirling discharge pipe 103 A.
  • the discharge control device 112 includes a plurality of suction pipes 107 (herein, 4 pipes) that collects the liquid in the dissolved air floatation tank 102 , a single horizontal collecting pipe 108 that is connected to the suction pipes 107 on a discharge side, a riser pipe 109 that is vertically connected to the collecting pipe 108 outside a side wall of the dissolved air floatation tank 102 and guides the liquid collected through the collecting pipe 108 upward, a subtank 110 formed on an outer surface of the dissolved air floatation tank 102 so as to surround an upper end of this riser pipe 109 , and a level control pipe 111 that is provided in this subtank 110 and has a suction opening 111 A that is movable upward and downward on the upper end within a certain range and a discharge opening 101 B on the lower end.
  • suction pipes 107 herein, 4 pipes
  • the separated substance extracting device 104 includes an endless chain 104 A and a plurality of skimmers 104 B attached to the endless chain 104 A at certain intervals.
  • the separated substance extracting device 104 is configured such that the skimmers 104 B sweep the scum floated on the liquid surface in the dissolved air floatation tank 102 from left to right in FIG. 6 to collect the scum at a position of the outer side of the dissolved air floatation tank 102 .
  • the separated substance extracting device 104 includes a feed screw 104 C for transporting the floated scum collected by the skimmers 104 B upward in FIG. 7 and discharging the scum.
  • the flocculant reaction tank device 105 has a flocculant reaction tank 105 D to which a flocculant dissolved in each of an automatic radioactive substance adsorbent dissolving device 105 A, an automatic organic flocculant dissolving device 105 B, and an automatic inorganic flocculant dissolving device 105 C is supplied.
  • the flocculant is dissolved and mixed in raw water.
  • Reference numeral 105 E in FIG. 5 shows a stirring device 105 E for favorably mixing the flocculant and raw water.
  • the liquid containing larger bubbles from the bubble-containing liquid separating device 60 shown in FIG. 5 is sent to a sending side of the flocculant reaction tank 105 D, and is mixed in raw water in which the flocculant is mixed at the sending side.
  • a radioactive substance adsorbent is, for example, a zeolite slurry or Prussian blue.
  • the organic flocculant is an anionic, nonionic, cationic, or amphoteric organic polymer flocculant.
  • the inorganic flocculant is iron chloride, aluminum sulfate, polyaluminum chloride, or the like.
  • the ultrafine bubble-containing liquid is poured into raw water (for example, radiation-contaminated water) in which the flocculant is dissolved and added. After that, a helical flow that is upward from a left end to right in FIG. 5 is formed by the swirling flow guide 103 B.
  • the gap 103 C is formed between a lower end of the swirling flow guide 103 B and the bottom of the dissolved air floatation tank 102 .
  • the liquid in the dissolved air floatation tank 102 is rolled together by the above-described swirling flow to form a large circulating flow in the dissolved air floatation tank 102 .
  • the flocculant can incorporate a trace amount of particles of, for example, cesium that accidentally comes into contact therewith.
  • the flocculant can hardly incorporate the particles.
  • the ultrafine bubbles always allow the floated and separated substance to partially come into contact with the flocculant due to the area of interface of the ultrafine bubbles, and to be incorporated as a coagulated floc that is electrically neutralized. As a result, most of cesium ions form a stably floated substance.
  • the substance is floated on the liquid surface as the floated scum.
  • the floated scum is collected at a right end in FIG. 5 by the skimmers 104 B driven by the endless chain 104 A in the separated substance extracting device 104 , and is further collected upward in FIG. 7 by the feed screw 104 C and discharged outside.
  • the discharged floated scum is dehydrated and solidified by a dehydration solidification device 113 , and put in a container. A liquid generated by the dehydration is returned to the dissolved air floatation tank 102 .
  • the dissolved air floatation apparatus 100 has the flocculant reaction tank device 105 .
  • the present invention is not limited to the embodiment, and is also applied to an embodiment in which the flocculant reaction tank device 105 is not provided.
  • the dissolved air floatation tank could separate the oil as a floated and separated substance to obtain agricultural water or potable water.
  • the flocculant organic and inorganic flocculants are used.
  • the ultrafine bubble-containing liquid used in ultrafine bubble cleaning in the first and second embodiments is produced by the ultrafine bubble-containing liquid production device 10 .
  • the ultrafine bubble-containing liquid production device 10 is configured to have a gas-liquid mixing unit 20 , a nozzle 30 provided in the gas-liquid mixing unit 20 (see FIG. 11 ), a swirling flow forming device 40 (see FIGS. 12 and 13 ), a pressurized liquid supply system 50 , and the bubble-containing liquid separation device 60 (see FIGS. 14 and 15 ).
  • the gas-liquid mixing unit 20 is configured to include a liquid flow path 22 capable of passing a liquid, a liquid inflow port 24 provided at one end (in FIG. 11 , right end) of the liquid flow path 22 , a bubble-containing liquid discharge port 26 provided at the other end (in FIG. 11 , left end), and an ejection port 28 that is formed between the inflow port 24 and the discharge port 26 so that the gas can flow from a side (in FIG. 11 , upper portion) to the liquid flow path 22 .
  • the nozzle 30 in which a tip 30 A is opened at a position of the ejection port 28 for jet of a liquid is provided so as to be projected from the inflow port 24 in the liquid flow path 22 .
  • the swirling flow forming device 40 including four fixed blades 42 in a circumferential direction is inserted in the nozzle 30 from a proximal end 30 B of the nozzle 30 and fixed in the inside of the nozzle 30 .
  • the liquid that forms a swirling flow by the swirling flow forming device 40 during passing through the nozzle 30 is jetted from the tip 30 A as the swirling flow.
  • the position of the tip 30 A of the nozzle 30 is determined so that a discharge flow of gas sucked out from the ejection port 28 under a negative pressure formed by the swirling flow from the tip 30 A inflows into the swirling flow.
  • the nozzle 30 includes a gas guide device 44 configured by a cylindrical guide surrounding the tip 30 A with a space therebetween.
  • the gas guide device 44 is configured to guide the discharge flow of gas sucked from the ejection port 28 into the liquid flow path 22 to inflow into the swirling flow of liquid jetted from the tip 30 A of the nozzle 30 .
  • the nozzle 30 has a tapered shape narrowed toward its tip.
  • the gas guide device 44 has a tapered inner circumferential surface 44 A that is tapered in a liquid jet direction, and is attached to the nozzle 30 with a screw (not illustrated) so that a middle section in an axial direction of the tapered inner circumferential surface 44 A is disposed at a position of the tip 30 A of the nozzle 30 .
  • an inflow pipe 52 is threaded and connected to the inflow port 24 of the gas-liquid mixing unit 20 .
  • a discharge pipe 54 is threaded and connected to the discharge port 26 , similarly to the inflow pipe 52 .
  • a gas introduction pipe 28 A is threaded and connected to the ejection port 28 .
  • a gas introduction amount controlling valve 28 B is provided in the middle of the gas introduction pipe 28 A.
  • the pressurized liquid supply system 50 includes the inflow pipe 52 , the discharge pipe 54 , the pressurization pump 56 capable of supplying a pressurized liquid containing fine bubbles to the inflow pipe 52 , a raw liquid supply pipe 57 that is connected to a suction side of the pressurization pump 56 and supplies a liquid to be mixed with a gas, and a transfer pipe 58 that is connected to a discharge side of the pressurization pump 56 and transfers a pressurized liquid.
  • the inflow pipe 52 is connected to the middle of the transfer pipe 58
  • the discharge pipe 54 is connected to the middle of the raw liquid supply pipe 57 .
  • the pressurized liquid supply system 50 is configured so that part of the ultrafine bubble-containing liquid generated at the gas-liquid mixing unit 20 is passed through the discharge pipe 54 , the raw liquid supply pipe 57 , the pressurization pump 56 , the transfer pipe 58 , and the inflow pipe 52 , and returned to the inflow port 24 of the gas-liquid mixing unit 20 .
  • Reference numeral 56 A in FIG. 1 shows a motor for driving the pressurization pump 56 .
  • the transfer pipe 58 of the pressurized liquid supply system 50 is connected to the bubble-containing liquid separation device 60 shown in FIG. 14 or 15 , and is configured to supply the ultrafine bubble-containing liquid under pressure to the bubble-containing liquid separation device 60 .
  • the bubble-containing liquid separation device 60 includes a storage type pressurized liquid tank having a circular cross section.
  • the bubble-containing liquid separation device 60 is configured to include a pressurized liquid inflow port 61 that is provided on an upper side face of the tank and into which the ultrafine bubble-containing liquid transferred through the transfer pipe 58 flows, a pressurized liquid discharge port 62 provided at a lower side face of the tank, a central liquid discharge port 63 provided at an upper end of the tank, and a swirling flow forming pipe 64 that is provided inside the pressurized liquid inflow port 61 and converts the flowing-in pressurized liquid into a downward swirling flow along the inner circumferential face of the tank.
  • the swirling flow forming pipe 64 is configured to guide the pressurized liquid from the pressurized liquid inflow port 61 so that the pressurized ultrafine bubble-containing liquid that flows in a radial direction of the circular cross section of the tank flows counterclockwise along the inner circumferential face of the circular cross section of the tank into a helical flow that flows slightly diagonally downward.
  • the liquid flowing in from the pressurized liquid inflow port 61 is discharged outside the tank from the pressurized liquid discharge port 62 provided at the lower side face of the tank and the central liquid discharge port 63 .
  • Each discharge amount is controlled by a discharge amount controlling valve 65 that is provided near the central liquid discharge port 63 .
  • the swirling flow forming pipe 64 converts the pressurized liquid flowing into the tank into a swirling flow.
  • the central liquid discharge port 63 is provided at a central position of the upper end face of the tank, the liquid at a center part of the swirling flow in the tank is discharged from the central liquid discharge port 63 and the liquid at an outside part of the swirling flow is discharged from the pressurized liquid discharge port 62 .
  • the raw liquid to be mixed with a gas is sucked from the raw liquid supply pipe 57 , and sent under pressure from the transfer pipe 58 by the pressurization pump 56 .
  • Part of the liquid in the transfer pipe 58 passes through the inflow pipe 52 and the inflow port 24 and reaches the gas-liquid mixing unit 20 .
  • the rest is brought to the pressurized liquid inflow port 61 of the bubble-containing liquid separation device 60 .
  • the liquid flowing in from the inflow port 24 of the gas-liquid mixing unit 20 is jetted from the tip 30 A of the nozzle 30 into the liquid flow path 22 while the liquid flows as a swirling flow by the swirling flow forming device 40 provided at the proximal end 30 B of the nozzle 30 .
  • the pressure in the gas-liquid mixing unit 20 is made higher than the exterior pressure, and is, for example, 2.5 to 6.0 kg/cm 2 .
  • the negative pressure applied to the ejection port 28 is 2 to 3 or more times that of a case where a liquid generally linearly flows. Accordingly, even when the pressure in the gas-liquid mixing unit 20 is higher than the exterior pressure, a gas can be reliably discharged from the ejection port 28 .
  • the helical flow of the liquid jetted from the tip 30 A of the nozzle 30 involves the liquid in the liquid flow path 22 and the gas from the ejection port 28 to form a helical flow.
  • the gas sucked from the ejection port 28 is involved as a helical flow along a tapered outer circumference surface 31 of the nozzle 30 between the outer circumference surface and a tapered inner circumference surface 44 A of the gas guide device 44 .
  • the gas is strongly mixed in the helical flow of the liquid jetted from the nozzle 30 .
  • the liquid containing ultrafine bubbles passes through the discharge port 26 of the gas-liquid mixing unit 20 and the discharge pipe 54 and reaches the raw liquid supply pipe 57 . From the raw liquid supply pipe 57 , the liquid is sucked by the pressurization pump 56 , and sent under pressure from the transfer pipe 58 . Part of the sent pressurized liquid is supplied to the gas-liquid mixing unit 20 similarly to the above description. The occurrence and rupture of bubbles due to cavitation are repeated, and remaining large bubbles are also changed into smaller ultrafine bubbles.
  • the size of bubbles contained in the ultrafine bubble-containing liquid is mostly 100 nm or less. However, when the liquid is passed through the gas-liquid mixing unit 20 a plurality of times, the ratio of bubbles of 30 nm or less is increased. Bubbles of less than 10 ⁇ and 3 ⁇ or more, though not all, could be confirmed. For example, measurement can be performed as follows using synthetic zeolites in which the size of voids is designed to 3 ⁇ or more in advance.
  • Magnesium and cesium cations were adsorbed on synthetic zeolites each having voids of 3 ⁇ , 4 ⁇ , 5 ⁇ , 7 ⁇ , and 10 ⁇ , and repeatedly washed with pure water. When the amount of cations eluted from a filtrate was constant, the zeolites were mixed and stirred with water containing ultrafine bubbles. At this time, significant elution of the magnesium and cesium cations was confirmed.
  • the present inventor could confirm that bubbles having a size of 3 ⁇ or more to less than 10 ⁇ were present in produced ultrafine bubble-containing water.
  • a reason of confirmation of the ultrafine bubbles having a size of less than 10 ⁇ is as follows.
  • the size is equal to or smaller than the wavelength of visible light, and the ultrafine bubbles that are transparent cannot be confirmed visually. Since such ultrafine bubbles and the synthetic zeolites with the pore diameters of 10 ⁇ or less induced the aforementioned phenomenon, the size to be confirmed is determined to be less than 10 ⁇ .
  • Ultrafine bubbles having a size of 30 nm or less that cannot be conventionally measured are referred to as ultrafine bubbles.
  • ultrafine bubbles containing bubbles having a size of less than 10 ⁇ that could not visually confirmed could be dissolved at a rate of 15 to 20 L/min in an amount of ultrafine bubble-containing water discharged from an outlet of the transfer pipe 58 of 600 t/day to 1,250 t/day.
  • the swirling flow of the liquid is applied to an ejector, and the gas-liquid mixing unit 20 in which the gas is sucked out is used.
  • the gas-liquid mixing unit 20 in which the gas is sucked out is used.
  • ultrafine bubbles are slightly generated. Therefore, when the ultrafine bubbles are selected over time using the bubble-containing liquid separation device as described above or selected by providing the bubble-containing liquid separation device at many stages, a liquid containing a large amount of ultrafine bubbles can be produced.
  • the ultrafine bubble-containing liquid passes through the transfer pipe 58 , and is supplied to the pressurized liquid inflow port 61 of the bubble-containing liquid separation device 60 .
  • the bubble-containing liquid separation device 60 having a tank shape is always filled with the pressurized liquid supplied from the pressurized liquid inflow port 61 , and the pressurized liquid is discharged outside in only an amount corresponding to the flow amount of the pressurized liquid from the central liquid discharge port 63 and the pressurized liquid discharge port 62 .
  • the pressurized liquid that is supplied from the transfer pipe 58 through the pressurized liquid inflow port 61 to the pressurized liquid in the bubble-containing liquid separation device 60 flows into the tank by the swirling flow forming pipe 64 as a swirling flow that flows diagonally downward along the inner circumferential surface of the tank constituting the bubble-containing liquid separation device 60 .
  • a large swirling flow that flows counterclockwise downward is formed in the tank, a liquid that contains relatively large bubbles and has a smaller specific gravity is concentrated to the central part of the swirling flow, and an ultrafine bubble-containing liquid that contains relatively small ultrafine bubbles and has a larger specific gravity is concentrated to apart along the inner circumferential surface of the tank.
  • the former liquid is discharged from the central liquid discharge port 63
  • the latter liquid is discharged from the pressurized liquid discharge port 62 .
  • a physical property in which the rising rate is lower as the size of fine bubbles is smaller is found.
  • separation of larger bubbles and smaller fine bubbles promotes.
  • the liquid in which the ratio of ultrafine bubbles is increased in the swirling flow is discharged from the pressurized liquid discharge port 62 .
  • the relatively large bubbles are separated and raised in swirling from a group of ultrafine bubbles by a centrifugal force, and concentrated to the vicinity of the upper central part of the tank, thereby being efficiently discharged.
  • the amount of relatively large separated bubbles is about 5% of the total amount of bubbles including ultrafine bubbles.
  • the substantially whole amount of bubbles can be separated and removed.
  • the amount of fine bubbles having a size of 100 nm or less or 30 nm or less and 10 ⁇ or more is slight, and the content of ultrafine bubbles having a size of 10 ⁇ or less is increased.
  • the ultrafine bubbles are not lost by joining the ultrafine bubbles to fine bubbles that are slightly present and have a size as relatively large as 10 ⁇ or more. Therefore, a specific function of the ultrafine bubbles can be exerted at a later stage.
  • Experiment water pure water that is boiled and then cooled (water containing no dissolved air)
  • Synthetic zeolites 1.5 g of synthetic zeolites having pores of less than 1 nm
  • FIG. 7 shows a flow chart of the above-described confirmation procedure.
  • the gas-liquid mixing unit 20 has a configuration in which the ultrafine bubble-containing liquid is repeatedly circulated.
  • the gas-liquid mixing unit 20 may have a configuration in which at a previous stage of finally forming ultrafine bubbles, the fine bubble-containing liquid in a state where at least bubbles that are slightly larger than ultrafine bubbles are contained is supplied to the gas-liquid mixing unit 20 .
  • a first gas-liquid mixing unit 70 corresponding to the aforementioned gas-liquid mixing unit 20 , and a second gas-liquid mixing unit 72 that supplies the fine bubble-containing liquid to the first gas-liquid mixing unit 70 and corresponds to the aforementioned gas-liquid mixing unit 20 are provided as a two-stage configuration.
  • the ultrafine bubble-containing liquid from the first gas-liquid mixing unit 70 does not need to be circulated.
  • a first pressurization pump 74 that supplies the fine bubble-containing liquid to the first gas-liquid mixing unit 70 and a second pressurization pump 76 that supplies a raw liquid to the second gas-liquid mixing unit 72 under pressure are provided.
  • the present invention is usable in businesses of purifying contaminated soil and contaminated water, businesses of separating and collecting fine particles such as petroleum from seawater and water with dispersed petroleum etc., and businesses of collecting metal micro particles in which collecting is conventionally difficult.

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