EP2558189A1 - Générateur de micro-bulles - Google Patents

Générateur de micro-bulles

Info

Publication number
EP2558189A1
EP2558189A1 EP11769190A EP11769190A EP2558189A1 EP 2558189 A1 EP2558189 A1 EP 2558189A1 EP 11769190 A EP11769190 A EP 11769190A EP 11769190 A EP11769190 A EP 11769190A EP 2558189 A1 EP2558189 A1 EP 2558189A1
Authority
EP
European Patent Office
Prior art keywords
liquid
chamber
microbubble
gas
treated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11769190A
Other languages
German (de)
English (en)
Other versions
EP2558189A4 (fr
Inventor
Kim Choon Ng
Madhav Menon Pattathil
Jayaprakash Saththasivam
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National University of Singapore
Original Assignee
National University of Singapore
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National University of Singapore filed Critical National University of Singapore
Publication of EP2558189A1 publication Critical patent/EP2558189A1/fr
Publication of EP2558189A4 publication Critical patent/EP2558189A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2373—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0205—Separation of non-miscible liquids by gas bubbles or moving solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/20—Accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/08—Prevention of membrane fouling or of concentration polarisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
    • B01F23/2323—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/60—Pump mixers, i.e. mixing within a pump
    • 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1289—Aeration by saturation under super-atmospheric pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/26—Specific gas distributors or gas intakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/18—Use of gases
    • B01D2321/185—Aeration
    • 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
    • B03D1/02—Froth-flotation processes
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/727—Treatment of water, waste water, or sewage by oxidation using pure oxygen or oxygen rich gas
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/008—Originating from marine vessels, ships and boats, e.g. bilge water or ballast water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
    • C02F2103/322—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters from vegetable oil production, e.g. olive oil production
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/42—Nature of the water, waste water, sewage or sludge to be treated from bathing facilities, e.g. swimming pools
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/008—Mobile apparatus and plants, e.g. mounted on a vehicle
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/20—Prevention of biofouling
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a microbubble generator and method of generating microbubbles, and an apparatus and method for treating a liquid using microbubbles.
  • Treatment of water to be potable and of waste water for discharge and reuse typically involves using both organic and inorganic chemicals for the various unit processes of the treatment system. These chemicals may remain in the treated water as residue, as by-products of chemical reaction with the pollutants, or separate out as sludge which is not only difficult to handle and dispose of, but is also extremely expensive to remove, increasing the life cycle cost of the system. Some chemicals like chlorine in water treatment are also known to produce harmful by-products of chlorination like trihalomethanes (THMs), which are known carcinogens.
  • THMs trihalomethanes
  • the microbubble generator is configured to mix any gas in liquid for producing microbubbles of either positive or negative charge, depending on the liquid pH and the nature of the gas (acid or basic).
  • a liquid which may be the same as or different from the liquid in which the microbubbles are generated, two reaction vessels or chambers are preferably provided, one for solid/gas-liquid separation in concurrent flow and the other for oxidation, disinfection & pH adjustment purposes in counter current flow.
  • Introduction of the microbubble gas-liquid emulsion into a liquid to be treated leads to efficient removal of suspended matter such as submicron, non-polar suspended particles or solids from the liquid to be treated.
  • microbubbles This is effected by attachment of the charged microbubbles to these suspended matter, thereby increasing buoyancy of the microbubbles, making them rise faster along with the suspended matter in the liquid, to eventually float on the surface of the liquid.
  • the floating suspended matter can then be skimmed off.
  • Submicron charged particles in the suspended matter can also be neutralized by oppositely charged microbubbles, thereby destabilizing the emulsion, making them agglomerate to float or sink based on their specific gravity.
  • the microbubbles can strip dissolved gases in the liquid. Oxidation and disinfection of the liquid can also be effected by collapsing the microbubbles by forming hydroxyl radicals without any external stimuli.
  • Nanobubbles may be produced by collapsing the microbubbles, which then remain in the liquid for a longer duration for more effective water treatment.
  • the microbubble gas-liquid emulsion also accelerates the formation of gas hydrates and increases the dissolved gas constituent in the liquid. Removal of oil and grease from the liquid can also be achieved, together with lowering of the chemical oxygen demand (COD) and biochemical oxygen demand (BOD) measurements that . indicate the amount of organic pollution in the liquid.
  • COD chemical oxygen demand
  • BOD biochemical oxygen demand
  • a microbubble generator comprising: a pump configured to mix a liquid and a gas to form a pressurized gas-liquid mixture therein; a contact chamber in fluid connection with the pump and configured to enhance dissolution of the gas in the pressurized gas-liquid mixture therein; and
  • microbubble generator in fluid connection with the contact chamber and configured to discharge a microbubble emulsion comprising the liquid and microbubbles of the gas.
  • the microbubble generator may further comprise a vent in fluid connection with the contact chamber, the vent configured to release undissolved gas from the pressurized gas-liquid mixture.
  • a method of generating microbubbles in a liquid comprising: mixing a liquid and a gas in a pump to form a pressurized gas-liquid mixture; enhancing dissolution of the gas in the pressurized gas-liquid mixture in a contact chamber; and discharging a microbubble emulsion comprising the liquid and microbubbles of the gas through a valve in fluid connection with the contact chamber.
  • the method may further comprise releasing undissolved gas from the pressurized gas- liquid mixture prior to discharging the microbubble emulsion through the valve.
  • an apparatus for treating a liquid comprising: a first chamber having an inlet for receiving a liquid to be treated and an outlet for discharging treated liquid; and a first microbubble generator according to the first aspect for providing a first microbubble emulsion into the first chamber to allow microbubbles to attach to suspended matter in the liquid to form a scum that is separable from the liquid.
  • the liquid received by the pump of the first microbubble generator may be obtained from a same source as the liquid to be treated.
  • the apparatus may further comprise a second chamber having an inlet for receiving the treated liquid discharged from the first chamber and an outlet for discharging the treated liquid; and a second microbubble generator according to the first aspect for providing a second microbubble emulsion into the second chamber, wherein in-flow of the liquid to be treated and in-flow of the first microbubble emulsion in the first chamber are in a same direction, and wherein in-flow of the treated liquid and in-flow of the second microbubble emulsion in the second chamber are in opposing directions.
  • the liquid received by the pump of the second microbubble generator may be the treated water discharged from the first chamber.
  • a fourth aspect there is provided method of treating a liquid, the method comprising: providing a liquid to be treated to a first chamber; providing a first microbubble emulsion generated according to the method of the second aspect into the first chamber; and discharging treated liquid from the first chamber.
  • the liquid mixed by the pump of the first microbubble generator may be obtained from a same source as the liquid to be treated.
  • the method may further comprise providing the treated liquid from the first chamber to a second chamber, providing a second microbubble emulsion generated according to the method of the second aspect into the second chamber; and discharging the treated liquid from the second chamber, wherein in-flow of the liquid to be treated and in-flow of the first microbubble emulsion in the first chamber are in a same direction, and wherein in- flow of the treated liquid and in-flow of the second microbubble emulsion in the second chamber are in opposing directions.
  • the liquid mixed by the pump of the second microbubble generator may be the treated liquid obtained from the first chamber.
  • FIG. 1 is a schematic diagram of an exemplary microbubble generator
  • FIG. 2 is a schematic diagram of an exemplary application of microbubble injection in concurrent and counter flow chambers
  • FIG. 3 is a flowchart of an exemplary method of generating microbubbles.
  • FIG. 4 is a flowchart of an exemplary method of liquid treatment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • the microbubble generator 10 comprises a pump 20 configured to mix a liquid and a gas to form a pressurized gas-liquid mixture therein 102.
  • the pump 20 is preferably a two phase high pressure pump of up to 6 bar pressure.
  • the pump 20 is configured to receive liquid provided through a liquid line 31 from a liquid supply 30 at a first inlet 21 of the pump 20, 102.
  • a gate valve 11 is preferably provided to control liquid suction pressure and flow to the pump 20.
  • Suction pressure may be indicated by a vacuum gauge 12 provided at the first inlet 21.
  • the pump 20 is also configured to receive gas from a gas supply 32 to be mixed with the liquid.
  • the gas is provided through a gas line 33 to the pump 20 at a second inlet 22 of the pump 20, 102, preferably via an electrical solenoid valve 13 and a mechanical non-return valve 14 at the second inlet 22.
  • the amount of gas being introduced can be controlled by a flow regulator 15 in the gas line 33.
  • the gas-liquid ratio is mainly dependent on solubility of the gas in the liquid phase and its partial pressure. In a preferred embodiment, an industry standard of up to 0.2 gas-to-liquid ratio was chosen for gas comprising a mixture of air, oxygen and ozone gas 34.
  • the pump 20 draws in the gas and the liquid, preferably simultaneously, in order to produce a pressurized gas-liquid mixture at a desired gas-to-liquid ratio, by appropriate adjustment of the suction valve 11 and a discharge valve 16 provided downstream of the pump 20.
  • An outlet 23 of the pump 20 is in fluid connection with an inlet 41 of a liquid-gas contact chamber 40.
  • the pressurized gas-liquid mixture from the pump 20 is channelled to the contact chamber 40.
  • the contact chamber 40 is preferably configured to provide a contact time of about 2 minutes or more for enhancing dissolution of the gas in the pressurized gas-liquid mixture 104.
  • a pressure gauge 17 and the discharge valve 16 are provided downstream of the contact chamber 40 in order to regulate flow of the pressurized gas-liquid mixture at a desired pump pressure.
  • a vent 18 is installed at an outlet 42 of the contact chamber 40 to allow removal of undissolved gas from the pressurized gas-liquid mixture.
  • the vent 18 may comprise a needle valve.
  • the principle behind the microbubble generator 10 is to dissolve the gas in the liquid phase under high pressure in the pump 20, with further enhancement of gas dissolution by passing the gas-liquid mixture through the contact chamber 40.
  • the liquid becomes saturated with the gas at high pressure in the pump 20 and in the contact chamber 40 because of elevated solubility due to high partial pressure.
  • the saturated liquid After passing through the contact chamber 40, the saturated liquid is subjected to throttling by the discharge valve 16. This is achieved by establishing a gauge pressure or difference in pressure of about 4 to 6 bars between the pump 20 and the discharge valve 16, so that upon passing the pressurized gas-liquid mixture through the discharge valve 16, a microbubble emulsion comprising the liquid and microbubbles of the gas is discharged 106. This occurs because pressure in the gas-liquid mixture reduces after throttling such that the gas-liquid mixture loses equilibrium and becomes
  • microbubbles due to a shearing and decompression phenomenon at the valve throttle 16.
  • the bubbles are so fine and electrically charged that a microbubble emulsion, i.e., an emulsion of gas and liquid, is formed, turning the liquid medium milky white by the suspension of the gas microbubbles in it. It is estimated that the microbubbles have a 20-50 micron size.
  • the surface area of the microbubble is inversely proportional to its diameter, this increases the surface area of the gas-in-liquid emulsion, increasing the mass transfer coefficient. From a literature survey, it has been reported that the volumetric mass transfer co-efficient can increase 5-to-6 fold by this technique.
  • the high surface area of the microbubble transfer the gas in the microbubble to the surrounding liquid.
  • the increased mass transfer of the gas to the liquid medium thus further reduces the size/volume of the microbubble, thereby increasing the pressure of the gas (Laplace pressure) within the microbubble.
  • the reduction in size of the microbubble increases the mass transfer rate and the surface charge of the bubble, thereby increasing its Zeta potential ⁇ .
  • each microbubble emulsion When the microbubble emulsion is passed into a liquid to be cleaned, the increased surface charge and Zeta potential of each microbubble attract submicron suspended particles to it, thereby increasing its buoyancy and lifting it to the liquid surface to form a layer of scum comprising suspended matter such as the suspended submicron particles and oil and grease.
  • This scum can be readily skimmed off the liquid surface. Since the submicron suspended particles are smaller than the microbubble, each microbubble can attach numerous suspended submicron particles so that the total suspended solids (TSS) in the liquid can be reduced and the water clarity improved tremendously.
  • TSS total suspended solids
  • the microbubble generator 10 therefore requires no high pressure large contact tank in order for saturation and dissolution of the gas in the liquid medium to take place effectively. This allows the microbubble generator 10 to be compact and portable so that it can be readily brought to locations where water treatment is required to be performed to remove suspended matter in the water.
  • FIG. 2 An exemplary apparatus 50 for treating a liquid such as liquid using the microbubble generator 10 described above is shown in FIG. 2.
  • the apparatus 50 comprises a first flow chamber 51 into which a liquid to be treated 60 is provided 501.
  • a first flow chamber 51 into which a liquid to be treated 60 is provided 501.
  • microbubble emulsion 61 is also provided into the first flow chamber 51, 502.
  • the liquid to be treated 60 flows in a same direction 71 as a direction 71 of introduction of the microbubble emulsion 61.
  • the first flow chamber 51 functions as a concurrent flow chamber.
  • the liquid to be treated 60 and the liquid supplied 60 to a microbubble generator 10-1 for formation of the microbubble emulsion are provided from a same source 30. Both the liquid to be treated 60 and the microbubble emulsion 61 are preferably introduced into a bottom end 52 of the first flow chamber 51.
  • scum 80 that comprises suspended matter such as suspended particles, oil, grease and other undesirable gasses such as ammonia, that have been separated out from the liquid 60 by the microbubbles, can then be separated from the treated liquid 62 by skimming the scum 80 off into a scum tank 82 using a separator or skimming device (not shown), leaving a treated liquid 62 that is discharged 503 from the first flow chamber 51.
  • the scum may be removed continuously by a separator or skimming device
  • the treated liquid 62 may be channelled out of the top end 53 of the first flow chamber 51 into a second flow chamber 54.
  • the second flow chamber 54 is provided for promoting oxidation, disinfection and pH adjustment etc. of the treated liquid 62.
  • the treated liquid 62 flows in an opposite direction 72 as a direction 73 of introduction of another microbubble emulsion 63 into the second flow chamber 54.
  • the second flow chamber 54 By configuring the second flow chamber 54 to provide a counter flow function, retention time of microbubbles in the treated water is maximized, to allow for collapsing of the microbubbles to produce radicals and nanobubbles to better oxidize and disinfect the treated liquid 62.
  • Some of the same treated liquid 62 from the first flow chamber 51 may be diverted to a second microbubble generator 10-2 for formation of the microbubble emulsion 63 that is fed into the counter flow chamber 54.
  • the microbubble emulsion 63 is preferably introduced into a bottom end 55 of the counter flow chamber 54 while the treated liquid 62 is preferably introduced into a top end 56 of the counter flow chamber 54.
  • the treated liquid 62 is finally discharged from the counter flow chamber 54, preferably through an outlet at the bottom end 55.
  • microbubbles make it impossible to break them by physical means due to the high energy requirements. It is therefore safe to pump such a microbubble emulsion to the suction of high pressure pumping systems without any cavitations inside the pumps. This property makes it ideal for applications in membrane systems for the following reasons:
  • pH adjustments may be made using carbon dioxide gas
  • membrane fouling can be prevented by the scouring action of the microbubbles on membrane surfaces
  • TDS dissolved solids
  • the microbubble generator 10 thus provides a clean technology with no harmful chemicals, using only harmless gases such as air, oxygen, ozone, carbon dioxide, nitrogen etc. Treating water with the microbubble emulsion separates the suspended solids, oil and grease and strips Unwanted gases in the bulk liquid while producing no additional sludge in the process.
  • Table 1 below shows the improvement in water quality of waste water from washing of tanker ship hulls after air flotation and ozone treatment using the liquid treatment apparatus 50 with the microbubble generator 10 and as described above.
  • microbubble liquid treatment apparatus 50 and method 500 can be easily adapted for cleaning or treating a wide range of liquids with varying amounts of solids, pH and for a wide variety of gases. Exemplary applications include the following:
  • the flow chambers 51, 54 may each comprise a single column or a plurality of columns, being designed to meet process flow rates in the apparatus 50.
  • the scum 80 may be removed by the separator or skimming device either continuously or at time intervals.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Nanotechnology (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Physical Water Treatments (AREA)

Abstract

La présente invention concerne un générateur de micro-bulles comprenant : une pompe configurée pour mélanger un liquide et un gaz afin d'y former un mélange pressurisé gaz-liquide ; une chambre de mise en contact en communication fluidique avec la pompe et configurée pour y améliorer la dissolution du gaz dans le mélange pressurisé gaz-liquide ; et une soupape en communication fluidique avec la chambre de mise en contact et configurée pour évacuer une émulsion de micro-bulles comprenant le liquide et les micro-bulles du gaz.
EP20110769190 2010-04-16 2011-04-18 Générateur de micro-bulles Withdrawn EP2558189A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32480010P 2010-04-16 2010-04-16
PCT/SG2011/000153 WO2011129775A1 (fr) 2010-04-16 2011-04-18 Générateur de micro-bulles

Publications (2)

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EP2558189A1 true EP2558189A1 (fr) 2013-02-20
EP2558189A4 EP2558189A4 (fr) 2013-10-02

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EP (1) EP2558189A4 (fr)
SG (2) SG10201502842RA (fr)
WO (1) WO2011129775A1 (fr)

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CN106927558A (zh) * 2017-05-09 2017-07-07 山东省城市供排水水质监测中心 一种臭氧多级利用的多相流气浮装置及处理方法
US10654732B2 (en) 2015-04-29 2020-05-19 Biotecam Assessoria E Desenvolvimento De Tecnologia Ambiental Ltda. Equipment and process for massive dissolution of gases in liquids

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CN102583816B (zh) * 2012-01-30 2014-05-07 西安石油大学 氮气气浮含油污水回用处理方法
US9327251B2 (en) * 2013-01-29 2016-05-03 Lanzatech New Zealand Limited System and method for improved gas dissolution
CN105923667B (zh) * 2016-06-17 2019-01-25 扬州大学 抑制养殖水体蓝藻生长的加压控藻充氧装置
CN109679690B (zh) * 2017-10-19 2020-09-11 中国石油化工股份有限公司 一种液相加氢系统及液相加氢方法
CN109679684B (zh) * 2017-10-19 2020-09-11 中国石油化工股份有限公司 一种液相加氢反应系统及方法
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GB202008874D0 (en) * 2020-06-11 2020-07-29 Clean Power Hydrogen Ltd A gas dissolution and bubble generator system
CN113087317A (zh) * 2021-05-19 2021-07-09 上海金相环境科技有限公司 一种采用纳微米气液界面技术处理养殖尾水的方法
CN116064215A (zh) 2021-11-03 2023-05-05 朗泽科技有限公司 具有动态喷射器的反应器

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Publication number Priority date Publication date Assignee Title
US10654732B2 (en) 2015-04-29 2020-05-19 Biotecam Assessoria E Desenvolvimento De Tecnologia Ambiental Ltda. Equipment and process for massive dissolution of gases in liquids
CN106927558A (zh) * 2017-05-09 2017-07-07 山东省城市供排水水质监测中心 一种臭氧多级利用的多相流气浮装置及处理方法

Also Published As

Publication number Publication date
SG184575A1 (en) 2012-11-29
SG10201502842RA (en) 2015-06-29
WO2011129775A1 (fr) 2011-10-20
EP2558189A4 (fr) 2013-10-02
WO2011129775A9 (fr) 2011-12-08

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