WO2010101152A1 - Dispositif pour le traitement par boues activées du type à séparation sur membranes et procédé correspondant - Google Patents

Dispositif pour le traitement par boues activées du type à séparation sur membranes et procédé correspondant Download PDF

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Publication number
WO2010101152A1
WO2010101152A1 PCT/JP2010/053349 JP2010053349W WO2010101152A1 WO 2010101152 A1 WO2010101152 A1 WO 2010101152A1 JP 2010053349 W JP2010053349 W JP 2010053349W WO 2010101152 A1 WO2010101152 A1 WO 2010101152A1
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Prior art keywords
membrane separation
activated sludge
aerobic tank
water
treated
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PCT/JP2010/053349
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English (en)
Japanese (ja)
Inventor
光太郎 北村
穣 森田
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株式会社日立プラントテクノロジー
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Publication of WO2010101152A1 publication Critical patent/WO2010101152A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/08—Flat membrane modules
    • 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
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/10—Accessories; Auxiliary operations
    • 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
    • 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
    • C02F3/1273—Submerged membrane bioreactors
    • 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
    • B01D2315/00—Details relating to the membrane module operation
    • B01D2315/06—Submerged-type; Immersion type
    • 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
    • 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 membrane separation type activated sludge treatment apparatus in which a membrane separation means is immersed in an aerobic tank holding activated sludge, and a method therefor.
  • FIG. 6 schematically shows this type of membrane separation type activated sludge treatment apparatus 100.
  • the aerobic tank 102 is filled with water to be treated 108 that has flowed from the water to be treated inflow pipe 102a.
  • the activated sludge 109 is held at a high concentration in advance, and the membrane separation means 104 is immersed therein.
  • the membrane separating means 104 one having a structure in which a large number of rectangular flat membranes with separation membranes on both sides is arranged in parallel in a transverse direction at a narrow interval is generally employed.
  • An air diffuser 106 is disposed below the membrane separator 104 and diffuses air supplied from the blower 106 a toward the membrane separator 104.
  • the membrane separation means 104 is provided with a suction pump 104a for discharging the treated water that has permeated through the flat membrane to the outside of the apparatus in the middle of the discharge pipe 104b.
  • the water to be treated 108 that has flowed into the aerobic tank 102 is biologically aerobically treated by the activated sludge 109, and organic substances, nitrogen, phosphorus, and the like in the water to be treated 108 are removed.
  • membrane separation means 104 membrane separation is performed by the suction force of the suction pump 104a, and the activated sludge 109 and the treated water are separated into solid and liquid.
  • the treated water that has permeated the flat membrane is discharged out of the apparatus through the discharge pipe 104b.
  • the activated sludge 109 stays in the aerobic tank 102, and the activated sludge is kept at a high concentration in the aerobic tank 102 together with the proliferation by the aerobic treatment.
  • the aeration from the aeration means 106 has three purposes.
  • the first purpose is to keep the aerobic tank 102 aerobic. Since oxygen is consumed in the biological aerobic treatment by the activated sludge 109, oxygen can be replenished by aeration to maintain the dissolved oxygen concentration in the treated water 108 in the aerobic tank 102 high. .
  • the second purpose is to wash the separation membrane of the membrane separation means 104.
  • Activated sludge and various solids adhere to and accumulate on the membrane surface of the flat membrane by membrane separation, and if left as it is, the permeability of the separation membrane gradually decreases, so that aeration is performed for the purpose of cleaning the membrane surface. That is, air bubbles diffused from below the membrane separation means 104 rise by buoyancy.
  • a shearing force is applied to the film surface of the flat film, and the solid content adhered and deposited on the film surface can be peeled off.
  • the third purpose is to form a circulating flow of the water to be treated 108 in the aerobic tank 102.
  • Ascending force of the diffused air bubbles and the density difference between the gas-liquid mixed liquid and the external liquid in the intermembrane water channel are used as a driving force, and the upward flow of the water to be treated 108 is generated in the membrane separation means 104, and the membrane The treated water 108 is sucked from below the separating means 104.
  • the to-be-processed water 108 pushed out above the membrane separation means 104 descends the flow path and is sucked again from below the membrane separation means 104.
  • the water to be treated 108 and the activated sludge 109 are sufficiently mixed and brought into contact with each other, and the aerobic treatment with the activated sludge 109 proceeds actively.
  • the membrane separation type activated sludge treatment apparatus 100 can simultaneously perform the aerobic treatment and the solid-liquid separation by the activated sludge 109 in the aerobic tank 102.
  • a sedimentation basin can be abbreviate
  • Patent Document 1 in order to solve the above problem, an aerobic tank for biologically aerobically treating the water to be treated with activated sludge held in the tank, and a membrane separation means immersed in the aerobic tank
  • a membrane separation type activated sludge treatment apparatus comprising: a diffuser for diffusing air from below the membrane separation means; and a treated water discharge means for discharging treated water permeated by the membrane separation means.
  • bubble refining means for refining air bubbles diffused from the air means and reaching the upper region of the membrane separation means with a rotating blade is disclosed.
  • the flow rate of water to be treated required for cleaning the membrane surface is determined by the amount of permeated water in the treated water.
  • the present invention pays attention to the above-mentioned problems, and does not reduce the effective membrane separation area, but provides a flow rate of water to be treated necessary for uniform and stable washing of the membrane surface and circulates in the aerobic tank.
  • An object is to provide a sludge treatment apparatus and method.
  • a membrane separation type activated sludge treatment apparatus includes an aerobic tank for biologically aerobically treating water to be treated with activated sludge, an air diffuser for supplying air necessary for the aerobic treatment, A membrane separation means that is immersed in the aerobic tank and disposed in the downward flow region of the circulating convection of the water to be treated that is formed in the aerobic tank by the aeration means. The problem was solved.
  • a membrane separation activated sludge treatment apparatus comprises an aerobic tank for biologically aerobically treating water to be treated with activated sludge retained in the tank, and the preferred one. Downflow that flows from above to below between the membranes of the membrane separation means from the upward flow in the aerobic tank by the membrane separation means immersed in the air tank and the air diffused to supply the air necessary for the aerobic treatment It is characterized by comprising a diffuser means for forming.
  • the membrane separation type activated sludge treatment apparatus supplies an aerobic tank for biologically aerobically treating the water to be treated with the activated sludge held in the tank, and air necessary for the aerobic treatment.
  • a membrane separation type activated sludge treatment apparatus comprising an air diffuser and a membrane separator immersed in the aerobic tank, wherein the membrane separator and the air diffuser are vertically arranged in the aerobic tank.
  • the air diffuser includes a fine air diffuser and a coarse air diffuser, and the coarse air diffuser is formed on the side of the separation wall.
  • the membrane-separated activated sludge treatment method of the present invention comprises a membrane separator in which an aerobic tank is provided with an aeration means, and after the aerobic treatment with the activated sludge retained in the aerobic tank, the treated water is subjected to membrane separation by the membrane separation means.
  • Activated sludge treatment method wherein a circulating convection is formed in an aerobic tank by the aeration means, and aerobic treatment is performed by a membrane separation means disposed in a downward flow formation region of the circulating convection in the aerobic tank.
  • the treated water is obtained by membrane separation of the treated water.
  • a membrane separation type activated sludge treatment method comprising aeration means in an aerobic tank, after aerobic treatment with activated sludge held in the aerobic tank, and membrane separation of treated water by membrane separation means,
  • the membrane separation means and the air diffusion means in the aerobic tank are separated, and an upward flow is generated in the aerobic tank by the air diffusion of the air diffusion means, and the upward flow is generated from the upper part of the membrane separation means. It is characterized in that it is caused to flow in, the space between the membranes is lowered, and discharged from the lower part of the membrane separation means to be refluxed.
  • the membrane separation activated sludge treatment apparatus and method according to the present invention have the following effects.
  • the air diffuser forms a so-called circulating convection that flows from the upward flow in the aerobic tank by the air diffused to supply the air necessary for the aerobic treatment into the downward flow flowing between the membranes of the membrane separation means downward Therefore, not only the activated sludge is deposited on the separation membrane, but also the treated sludge is peeled off from the activated sludge deposited on the separation membrane, and the treated water and activated sludge are returned to the aerobic tank. Will be circulated.
  • the downward flow of the present invention Since it is a liquid single-phase flow, the shearing force tends to be high, and the effect of improving the cleaning power can be obtained.
  • the air diffuser eliminates the need for air diffused by the air diffuser disposed below the conventional membrane separator. For this reason, the design specialized for the purpose of dissolving oxygen in to-be-processed water is possible. Therefore, since the supply of dissolved oxygen to the activated sludge is performed only with high-efficiency fine bubble aeration, the power required for the aeration can be reduced.
  • FIG. 1 is a diagram schematically showing an embodiment of a membrane separation type activated sludge treatment apparatus of the present invention.
  • FIG. 2 is an explanatory view of the membrane separation type activated sludge treatment apparatus of the present invention.
  • the membrane separation type activated sludge treatment apparatus 10 includes an aerobic tank 12, an air diffusion means 20, a membrane separation means 30, and a separation wall 50 as main components.
  • the aerobic tank 12 is a water tank filled with the water to be treated 16 supplied through the inflow pipe 14, and a predetermined amount of activated sludge 18 is held in the tank.
  • the activated sludge 18 contains complex microorganisms.
  • complex microorganisms include nitrifying bacteria, denitrifying bacteria, and anaerobic ammonia oxidizing bacteria.
  • pure strains include, for example, nitrifying bacteria, denitrifying bacteria, anaerobic ammonia bacteria, blue-green-degrading bacteria, PCB-degrading bacteria, dioxin-degrading bacteria, and environmental hormone-degrading bacteria.
  • a diffuser means 20 capable of releasing fine air bubbles (not shown) is disposed for the purpose of dissolving dissolved oxygen in the water 16 to be treated.
  • the air diffuser 20 comprises a blower 22 and an air diffuser 24, supplies air from the blower 22, and discharges fine air bubbles (not shown) from the air diffuser 24 to increase the dissolved oxygen concentration in the aerobic tank 12.
  • the fine air bubble here means a state where the diameter is 3 mm or less and the Reynolds number is 100 or less.
  • maintained at the aerobic tank 12 can perform the aerobic process which makes ammonia contained in the to-be-processed water 16 nitrate nitrogen, breathing dissolved oxygen.
  • the aeration means 20 of the present invention is arranged at a location where a membrane separation means 30 described later is not arranged above.
  • membrane separation means 30 is disposed and immersed in the water to be treated 16.
  • the membrane separation means 30 is formed by arranging a plurality of rectangular flat membranes 32 each having a separation membrane on both sides at regular intervals.
  • the gap between adjacent flat films is about 4 to 10 mm.
  • the side surfaces on both sides of each flat membrane 32 are aligned, and a plurality of flat membranes 32 are integrated by joining side plates to the side surfaces. Thereby, the side surface direction of the flat film 32 is sealed, the upper end and the lower end are opened (upper opening 38, lower opening 39), and a plurality of gaps formed between the flat films 32 have a rectangular cross-sectional shape.
  • each flat membrane 32 is in contact with the water to be treated 16, and the inside is connected to the treated water suction pump 42 via the discharge pipe 40.
  • the treated water suction pump 42 By sucking with the treated water suction pump 42, a pressure difference between the outside and inside of the flat membrane 32 is generated, and the activated sludge 18 and the treated water are separated from the treated water 16 into solid and liquid, and the treated water is inside the flat membrane 32. And is discharged out of the system through the treated water suction pump 42. At this time, the activated sludge is deposited on the separation membrane of the flat membrane 32.
  • the separation efficiency of the separation membrane per unit area decreases as the deposition thickness increases.
  • a separation wall 50 is provided between the aeration means 20 and the membrane separation means 30 in the aerobic tank 12.
  • the separation wall 50 is a wall that divides the diffuser 20 and the membrane separator 30 disposed in the aerobic tank 12 in the vertical direction, and has openings (an upper opening 52 and a lower opening, respectively) below and near the bottom of the water surface in the tank. 54).
  • the upper opening 52 is an opening through which the upward flow caused by the air diffused by the air diffuser 20 moves laterally below the water surface and flows from the air diffuser 20 side to the membrane separator 30, and below the water surface of the aerobic tank 12.
  • the lower opening 54 is an opening through which the downward flow that has descended between the membranes of the membrane separation means 30 is discharged, and is provided near the bottom surface of the aerobic tank 12.
  • the membrane separation means 30 is installed at the center of the aerobic tank 12, and the air diffusion pipes 24 of the air diffusion means 20 are arranged on both sides of the aerobic tank 12 so as to sandwich the membrane separation means 30.
  • a separation wall 50 having upper and lower openings 52 and 54 may be attached.
  • the aerobic tank 12 can be arranged at the center, and the membrane separation means 30 can be arranged around the aerobic tank 12.
  • the separation wall 50 is provided in the aerobic tank 12 to partition the aerobic treatment region and the membrane separation region.
  • the separation wall 50 is not provided, and the air diffuser 20 ( 24, 26, and 28), the membrane separation means 30 may be disposed in the downflow region of the water to be treated 16 in the circulation convection.
  • the sludge treatment method of the membrane separation type activated sludge treatment apparatus having the above configuration will be described below.
  • the membrane separation activated sludge treatment apparatus 10 having the above-described configuration, the water to be treated 16 flowing from the inflow pipe 14 of the water to be treated 16 is stretched into the aerobic tank 12.
  • activated sludge 18 is held in high concentration in advance.
  • the inside of the aerobic tank 12 is divided into two by the separation wall 50, and the aeration means 20 and the membrane separation means 30 are arranged respectively.
  • the membrane separation means 30 has a structure in which a large number of rectangular flat membranes 32 each having a separation membrane on both sides are juxtaposed in a lateral direction at a narrow pitch.
  • the gap between the adjacent flat membranes 32 is 4 to 10 mm, and the membrane separation process is performed in the process of the treated water 16 and the activated sludge 18 passing through the gap.
  • the suction pump 42 sucks the pressure difference between the outside and the inside of the flat membrane 32 to separate the activated sludge 18 and the treated water from the water 16 to be treated, and the treated water is separated into the flat membrane 32. And is discharged out of the treatment tank.
  • dissolved oxygen necessary for biological treatment can be supplied into the water to be treated in the aerobic tank 12. Further, when air is diffused by the air diffuser 20, air rises, in other words, an upward flow of the water to be treated 16 and the activated sludge 18 is generated by the air lift effect.
  • the upward flow of the present invention has a high flow velocity that gives a sufficient shearing force in the flow direction of the separation membrane surface of the membrane separation means 30.
  • the water to be treated 16 that flows in a direction orthogonal to the membrane surface so as to permeate into the membrane from the membrane surface, and the subject water that flows downward from above along the membrane surface of the separation membrane.
  • the flow of the treated water 16 is generated in two directions. A flow of the water to be treated 16 flowing downward from above along the membrane surface acts as a shearing force for stripping off the activated sludge 18 adhering to the membrane surface.
  • the inside of the intermembrane water channel of the separation membrane is a single-phase portion of the water to be treated 16, and the inside of the tank on the air diffusion means 20 side outside thereof is the air to be treated and the air to be diffused. It becomes a liquid mixed phase part.
  • the gas-liquid mixed phase portion has a lower specific gravity than the single phase portion.
  • the upward flow can be generated by giving a density difference between the single phase portion and the gas-liquid mixed phase portion. Specifically, the density difference can be adjusted by changing the opening area of the opening of the separation wall 50, the air space in the aerobic tank 12, the amount of air diffused by the air diffuser 20, and the like.
  • the flow of the water to be treated 16 sucked into the diffuser means 20 is generated below the single phase portion (membrane separation means 30) (arrow A).
  • the water to be treated 16 flows down from the aeration means 20 side to the membrane separation means 30 side as a downward flow due to the discharge of the water to be treated 16 (arrow B).
  • the upward flow moves sideways when it rises below the surface of the water in the tank.
  • the air bubbles are discharged to the outside of the tank and become the flow of the treated water 16 and the activated sludge 18.
  • the upward flow of the water to be treated 16 and the activated sludge 18 flowing from the upper opening 52 is reversed at the upper opening 38 of the membrane separation means 30 to become a downward flow.
  • This downward flow flows between the membranes of the membrane separation means 30 toward the lower opening 39, and the flow direction is reversed from that of the gas-liquid mixed phase portion.
  • the passage of the downflow not only suppresses the activated sludge 18 from accumulating on the separation membrane, but also causes the activated sludge 18 deposited on the separation membrane to be peeled off to the treated water 16.
  • the downward flow is sucked (discharged) from the lower opening 54 to the diffuser means 20 side, becomes an upward flow again, and returns inside the aerobic tank 12.
  • the separation membrane is washed more effectively than in the case of the upward flow by the conventional air diffuser to prevent a decrease in the efficiency of the membrane separation per unit time and unit area, and the effective membrane area due to the air diffused bubbles Can be prevented, and continuous and stable filtration can be realized.
  • the air diffuser 20 can be designed specifically for the purpose of dissolving oxygen in the water 16 to be treated. Therefore, the supply of dissolved oxygen to the activated sludge 18 is performed only by aeration with high-efficiency fine air bubbles, so that the power required for the aeration can be reduced. Furthermore, since it is possible to change the flow rate of the water to be treated 16 according to the amount of permeated water of the treated water, it is possible to save power, unlike the conventional case where the aeration is always continued.
  • the activated sludge flow rate necessary for cleaning the activated sludge 18 attached to the separation membrane surface is provided by the downflow formed by the treated water 16 generated by the aeration necessary for biological treatment and the upflow of the activated sludge 18. Therefore, it is not necessary to provide a conventional air diffuser for cleaning.
  • FIG. 3 is a graph showing the relationship between the sludge flow rate and the amount of membrane permeated water.
  • the horizontal axis represents the membrane surface sludge speed (m / s)
  • the vertical axis represents the average flux (m / d).
  • the average flux increases, that is, the amount of filtered water increases. Therefore, when the speed is increased, deposition of activated sludge on the separation membrane is suppressed or deposited. It can be interpreted that the separation membrane was peeled off by the fast flow rate of the water to be treated.
  • FIG. 4 is a diagram showing a schematic configuration of Modification 1 of the membrane separation type activated sludge treatment apparatus.
  • Other configurations are the same as those of the membrane separation type activated sludge treatment apparatus 10 of FIG. 1, and detailed description thereof is omitted.
  • the air diffuser 20 ⁇ / b> A of the membrane separation activated sludge treatment apparatus 10 ⁇ / b> A according to Modification 1 includes a fine air diffuser 26 and a coarse air diffuser 28.
  • the fine air diffuser 26 and the coarse air diffuser 28 are connected to the blower 22 via piping.
  • the fine air diffusing unit 26 is configured to allow fine diffusing with high oxygen dissolution efficiency.
  • the coarse air diffuser 28 is configured to be able to diffuse bubbles (air) larger than the diffused bubbles generated by the fine air diffuser 26.
  • the coarse air diffuser 28 is formed on the side of the separation wall 50 in the aerobic tank 12 rather than the fine air diffuser 26.
  • the fine bubbles diffused from the fine air diffuser 26 and the coarse bubbles diffused from the coarse air diffuser 28 handle activated sludge, so the viscosity of the liquid phase (sludge) is 10 times that of water. Treat as above. In this case, if the diameter is 3 mm or less and the Reynolds number is 100 or less, it is defined as a fine bubble.
  • the coarse bubbles are those having a Reynolds number exceeding 100 and a diameter exceeding 3 mm and having an elliptical shape, a jellyfish or mushroom shape, and a slug shape.
  • the shape of the bubble changes from spherical (Sphere) ⁇ ellipsoid ⁇ jellyfish or mushroom (Spherical Cap) ⁇ slug (Slug).
  • the coarse air diffuser 28 capable of diffusing coarse bubbles is disposed at the lower side portion of the separation wall 50. Therefore, the rising flow velocity due to the coarse bubbles is increased, and the air lift effect is achieved. As a result, the descending flow velocity of the descending flow due to the ascending flow of the water to be treated 16 and the activated sludge 18 can be increased. Therefore, not only the activated sludge is prevented from accumulating on the separation membrane, but also the activated sludge deposited on the separation membrane is easily peeled off by the water to be treated.
  • FIG. 5 is a diagram showing a schematic configuration of Modification 2 of the membrane separation type activated sludge treatment apparatus.
  • the configuration of the membrane-separated activated sludge treatment apparatus 10B of Modification 2 and the configuration different from the membrane-separated activated sludge treatment apparatus 10A shown in FIG. 4 are the configurations of the aeration means.
  • Other configurations are the same as those of the membrane separation type activated sludge treatment apparatus 10, and detailed description thereof is omitted.
  • the air diffuser 20B of the membrane separation activated sludge treatment apparatus 10B according to the modified example 2 is arranged below the membrane separator 30.
  • a second coarse air diffuser 29 is attached to the bottom of the aerobic tank 12.
  • the second coarse air diffusing unit 29 is also connected to the blower 22 through a pipe in the same manner as the fine air diffusing unit 26.
  • the second coarse air diffusion unit 29 installed under the membrane separation unit 30 is diffused,
  • the activated sludge 18 that forms an upward flow and adheres to the separation membrane can be washed.
  • the present invention can be used in facilities for purifying sewage.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Microbiology (AREA)
  • Organic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Activated Sludge Processes (AREA)

Abstract

L'invention porte sur un dispositif et un procédé pour un traitement par boues activées de type à séparation sur membranes, suivant lesquels de l'eau devant être traitée est amenée à circuler dans un réservoir aérobie à un débit nécessaire pour laver de façon uniforme et stable les surfaces des membranes, sans réduire la zone de séparation effective des membranes. Le dispositif pour le traitement par boues activées de type à séparation sur membranes est équipé de : un réservoir aérobie dans lequel de l'eau devant être traitée est traitée biologiquement et de façon aérobie par des boues activées maintenues à l'intérieur du réservoir ; un moyen de diffusion d'air qui introduit l'air nécessaire pour le traitement aérobie ; et un moyen de séparation sur membranes immergé à l'intérieur du réservoir aérobie. Dans le dispositif est formée une cloison par laquelle le moyen de séparation sur membranes est séparé verticalement du moyen de diffusion d'air à l'intérieur du réservoir aérobie. La cloison possède : une ouverture supérieure à travers laquelle le flux ascendant de l'eau à traiter provoqué par la diffusion de l'air à partir du moyen de diffusion d'air se déplace latéralement sous la surface de l'eau et arrive dans le côté du moyen de séparation sur membranes ; et une ouverture inférieure à travers laquelle le flux ascendant, qui est entré à travers l'ouverture supérieure et a été transformé en un flux descendant, sort du côté du moyen de diffusion d'air après passage à travers les membranes du moyen de séparation sur membranes.
PCT/JP2010/053349 2009-03-04 2010-03-02 Dispositif pour le traitement par boues activées du type à séparation sur membranes et procédé correspondant WO2010101152A1 (fr)

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JP2009051076A JP2012096125A (ja) 2009-03-04 2009-03-04 膜分離式活性汚泥処理装置及びその方法
JP2009-051076 2009-03-04

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US9333464B1 (en) 2014-10-22 2016-05-10 Koch Membrane Systems, Inc. Membrane module system with bundle enclosures and pulsed aeration and method of operation
USD779632S1 (en) 2015-08-10 2017-02-21 Koch Membrane Systems, Inc. Bundle body

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WO2014192476A1 (fr) * 2013-05-30 2014-12-04 住友電気工業株式会社 Dispositif de filtration, et procédé de filtration l'utilisant
JP6110216B2 (ja) * 2013-06-03 2017-04-05 パナソニック株式会社 排水処理装置

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JPH10128374A (ja) * 1996-10-28 1998-05-19 Hitoshi Daidou 生物処理方法
JP2005087830A (ja) * 2003-09-16 2005-04-07 Hitachi Plant Eng & Constr Co Ltd 膜分離式活性汚泥処理装置
JP2008246357A (ja) * 2007-03-30 2008-10-16 Kubota Corp 膜分離方法および装置

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Publication number Priority date Publication date Assignee Title
JPH10128374A (ja) * 1996-10-28 1998-05-19 Hitoshi Daidou 生物処理方法
JP2005087830A (ja) * 2003-09-16 2005-04-07 Hitachi Plant Eng & Constr Co Ltd 膜分離式活性汚泥処理装置
JP2008246357A (ja) * 2007-03-30 2008-10-16 Kubota Corp 膜分離方法および装置

Cited By (5)

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