WO2011152461A1 - Solid-liquid separator device and operation method thereof - Google Patents
Solid-liquid separator device and operation method thereof Download PDFInfo
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- WO2011152461A1 WO2011152461A1 PCT/JP2011/062610 JP2011062610W WO2011152461A1 WO 2011152461 A1 WO2011152461 A1 WO 2011152461A1 JP 2011062610 W JP2011062610 W JP 2011062610W WO 2011152461 A1 WO2011152461 A1 WO 2011152461A1
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- Prior art keywords
- diffuser
- air
- air diffuser
- tubes
- membrane
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- 239000007788 liquid Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims description 15
- 239000012528 membrane Substances 0.000 claims abstract description 154
- 238000000926 separation method Methods 0.000 claims abstract description 117
- 238000001914 filtration Methods 0.000 claims abstract description 31
- 238000009792 diffusion process Methods 0.000 claims description 37
- 239000012510 hollow fiber Substances 0.000 claims description 15
- 238000005273 aeration Methods 0.000 abstract description 32
- 239000007789 gas Substances 0.000 description 91
- 239000010802 sludge Substances 0.000 description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 28
- 239000011148 porous material Substances 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 210000003437 trachea Anatomy 0.000 description 5
- 238000001471 micro-filtration Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 239000011295 pitch Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 238000000967 suction filtration Methods 0.000 description 3
- 238000000108 ultra-filtration Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009285 membrane fouling Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
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- 238000005192 partition Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
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- 239000008213 purified water Substances 0.000 description 1
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Images
Classifications
-
- 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
- B01D63/082—Flat membrane modules comprising a stack of flat 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
-
- 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 solid-liquid separation apparatus that performs solid-liquid separation in water treatment and an operation method thereof.
- This application claims priority based on Japanese Patent Application No. 2010-125927 filed in Japan on June 1, 2010, the contents of which are incorporated herein by reference.
- Patent Document 1 proposes to set the number of gas discharge ports of the diffuser according to the horizontal sectional area of the separation membrane module.
- the present invention has been made in view of such circumstances, and even when filtration is performed over a long period of time, there is little blockage of the gas discharge port of the diffuser tube, and as a result, there is little blockage of the pores on the membrane surface due to the suspension, and the stable
- An object of the present invention is to provide a solid-liquid separator capable of continuing the filtration for a long period of time and an operation method thereof.
- the present invention includes the following aspects.
- separation membrane modules for example, separation membrane module 11 in the embodiment
- separation membrane module 11 in the embodiment separation membrane module 11 in the embodiment
- a diffuser tube for example, a diffuser in the embodiment
- gas discharge port for example, the gas discharge port 16 in the embodiment
- An air diffuser for example, the air diffuser 4 in the embodiment
- gas diffuser provided with a plurality of air tubes 13
- a plurality of the diffuser tubes are arranged in a horizontal direction, and the plurality of diffusers arranged in the horizontal direction are arranged.
- a plurality of air diffusion tube groups (for example, the air diffusion tube groups 13G and 14G in the embodiment) made of tubes are arranged in a plurality of layers in the vertical direction so that adjacent air diffusion tubes do not line up on the vertical line. It is a solid-liquid separator having means for switching supply air to the air diffusing tube group (for example, an automatic valve such as a valve in the embodiment).
- the air diffusing device includes at least one air diffusing tube group (for example, the air diffusing tube group 13G in the embodiment) of the plurality of air diffusing tube groups, A plurality of air diffusers configured with at least one gas supply pipe header (for example, the gas supply pipe header 12A in the embodiment) that communicates with each of the air diffusion pipes of the air diffusion pipe group on the same plane and supplies gas to each of the air diffusion pipes.
- the diffuser tube group is arranged in the vertical direction so that adjacent diffuser pipes do not line up on the vertical line. It is preferable to arrange them in a stacked manner.
- the filtration membrane sheet is preferably a filtration membrane sheet in which a number of hollow fiber membranes are arranged in parallel.
- the solid-liquid separator according to [1] to [3] is adjacent when the diffuser tube group arranged in a plurality of stages is viewed from the horizontal direction in the axial direction of the diffuser tube.
- the distance between the axes of the diffuser tubes which is the distance between the axes of the diffuser tubes of the pair of diffuser tubes, A distance between an axis of one of the pair of air diffuser groups and a straight line obtained by projecting an axis of the other air diffuser onto a horizontal plane including the axis of the one air diffuser;
- a second aspect of the present invention is a method for operating a solid-liquid separation device using the solid-liquid separation device according to any one of [1] to [4], wherein the plurality of aeration tubes A step of supplying air to one diffuser tube group, a step of stopping air supply to the diffuser tube group supplied with the air, and another diffuser tube different from the diffuser tube group stopped with the air supply. Supplying air to one of the trachea groups; The operation method of the solid-liquid separator which repeats every fixed period. It is.
- the present invention even when filtration is performed over a long period of time, it is possible to suppress the blockage of the gas discharge port of the diffusing tube, and as a result, it is possible to suppress the blockage of the pores of the membrane surface due to the suspension, and to stabilize Filtration can be continued for a long time.
- FIG. 1 It is a schematic block diagram of the membrane separation activated sludge processing apparatus which concerns on embodiment of this invention. It is a perspective view of the aeration apparatus in a membrane separation activated sludge processing apparatus. It is a perspective view of the diffuser tube in an air diffuser. It is a perspective view explaining arrangement
- FIG. 1 is a schematic configuration diagram of a membrane separation activated sludge treatment apparatus 1 which is a solid-liquid separation apparatus according to an embodiment of the present invention.
- the membrane separation activated sludge treatment apparatus 1 includes a membrane separation apparatus 3 provided in a membrane separation tank 2 and an air diffuser 4 for membrane cleaning.
- a blower 5 is connected to the air diffuser 4, and a suction pump 6 is connected to the membrane separator 3.
- the membrane separation device 3 performs solid-liquid separation by suction filtration of the water 7 to be treated in the membrane separation tank 2 by the suction pump 6 to obtain treated water.
- a pressure gauge 8 is provided between the membrane separation device 3 and the suction pump 6, and during the operation of the membrane separation activated sludge treatment device 1, the transmembrane differential pressure in the membrane separation device 3 is caused by the pressure gauge 8. It has been measured.
- the membrane separation device 3 has a plurality of separation membrane modules 11 arranged in parallel (assembled) with a plurality of filtration membrane sheets 10 in which a plurality of hollow fiber membranes 9 which are separation membranes are arranged in parallel.
- the hollow fiber membrane 9 is formed with a plurality of pores, and the water 7 to be treated passes through the pores, whereby solid-liquid separation is performed.
- the separation membrane mounted in the separation membrane module 11 is preferably a microfiltration membrane or an ultrafiltration membrane, and a flat membrane, a tubular membrane, a bag-like membrane, etc. may be used in addition to a hollow fiber membrane.
- a hollow fiber membrane capable of highly integrating the membrane area when compared at the base is preferable.
- polyethylene polyethylene, cellulose, polyolefin, polysulfone, PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene (polytetrafluoroethylene)), ceramics, or the like can be applied.
- the pore size of the pores of the separation membrane is not particularly limited, but a pore size of 0.001 to 0.1 ⁇ m, generally called an ultrafiltration membrane, or a pore size of 0.1, generally called a microfiltration membrane. Those having a pore size of ⁇ 1 ⁇ m or larger can be used, and are selected according to the particle size of the substance to be subjected to solid-liquid separation. For example, if it is used for solid-liquid separation of activated sludge, the thickness is preferably 0.5 ⁇ m or less, and if sterilization is required, such as filtration of purified water, it is preferably 0.1 ⁇ m or less.
- the air diffuser 4 is provided below the membrane separator 3 and includes gas supply pipe headers 12A to 12D, which are tubular bodies having a rectangular cross section in communication with the blower 5 with reference to FIG. 12A and 12B are arranged in parallel at a predetermined interval, and a first air diffuser 20 configured by arranging a plurality of air diffusers 13 between the gas supply pipe headers 12A and 12B, a gas supply pipe header 12C, 12D is arranged in parallel with a predetermined interval, and a second air diffuser 21 configured by disposing a plurality of air diffusers 14 between the gas supply pipe headers 12C and 12D.
- gas supply pipe headers 12A to 12D which are tubular bodies having a rectangular cross section in communication with the blower 5 with reference to FIG. 12A and 12B are arranged in parallel at a predetermined interval
- a first air diffuser 20 configured by arranging a plurality of air diffusers 13 between the gas supply pipe headers 12A and 12B, a gas supply pipe header 12C
- the gas supply pipe headers 12A to 12D are provided with air supply ports 15A to 15D to which air supplied from the blower 5 is supplied, respectively. Both ends of the air diffuser 13 are connected to the opposing inner surfaces of the gas supply pipe headers 12A and 12B, and the inside of the air diffuser 13 communicates with the gas supply pipe headers 12A and 12B. Both ends of the air diffuser pipe 14 are connected to the opposing inner surfaces of the gas supply pipe headers 12C and 12D, and the inside of the air diffuser pipe 14 communicates with the gas supply pipe headers 12C and 12D.
- the plurality of air diffusion tubes 13 are arranged in parallel with each other at a predetermined interval in the horizontal direction, and one end portions thereof are respectively connected on the same plane of the gas supply tube header 12A, and the gas supply tube header 12B. The other ends are connected on the same plane.
- a plurality of diffuser tubes 14 are arranged in parallel with each other at a predetermined interval in the horizontal direction, and one end portions thereof are connected to the same plane of the gas supply tube header 12C, respectively. The other end is connected to the same plane of 12D.
- the present invention is characterized in that a plurality of diffuser tube groups each composed of a plurality of diffuser tubes 13 arranged on the same horizontal plane are provided. Further, these diffuser tube groups are adjacent to each other.
- the diffusing tubes are stacked and arranged so as not to line up on the vertical line.
- the diffuser tubes vibrate as the gas passes through the diffuser tube during operation, etc. There are cases in which they approach each other or make the worst contact, so that a sufficient liquid flow path between the diffuser tubes cannot be secured, and there is a possibility that uniform aeration cannot be performed.
- diffuser tubes may be arranged in a staggered pattern when viewed from the side.
- the first air diffuser 20 is disposed so as to be stacked above the second air diffuser 21, and the plurality of air diffusers arranged in the horizontal direction in the first air diffuser 20.
- the diffuser tube group 13G composed of 13 is arranged to be stacked above the diffuser tube group 14G composed of a plurality of diffuser tubes 14 arranged in the horizontal direction in the second air diffuser 21.
- the axial center of the diffusing tube 13 in the diffusing tube group 13G and the axial center of the diffusing tube 14 in the diffusing tube group 14G are spaced apart in the horizontal direction, and the diffusing tube group 13G and the diffusing tube group 14G are viewed from the vertical direction.
- the diffuser tube 14 is positioned so as to be shifted between the adjacent diffuser tubes 13, and the diffuser tube 13 is positioned between the adjacent diffuser tubes 14.
- the air diffuser group is arranged in two stages, and the first air diffuser and the second air diffuser are arranged so as to be located in a mountain and a valley.
- the positions of the air diffuser groups in the positional relationship between the m-th stage and the n-th stage (mn ⁇ 2) may be the same in the vertical direction.
- a plurality of gas discharge ports 16 and a plurality of gas discharge ports 17 are formed on the uppermost surfaces of the diffusion tube 13 and the diffusion tube 14, and sludge is formed on the lowermost surfaces of the diffusion tube 13 and the diffusion tube 14.
- a sludge flow discharge hole 18 for inflow and discharge is formed.
- the position of the sludge flow discharge hole 18 in the longitudinal direction to be opened with respect to the diffuser pipe 13 and the diffuser pipe 14 can be arbitrarily set, but in this embodiment, the gas supply pipe headers 12A and 12B and gas on both sides are provided.
- a sludge flow discharge hole 18 is formed at the center of each of the air diffusion pipes 13 and the air diffusion pipes 14. Further, the number of the sludge flow discharge holes 18 in one aeration pipe is not particularly limited. Further, the sludge flow discharge hole 18 may not be formed in the air diffuser 13 but may be formed only in the air diffuser 14. Further, as the material used for the air diffuser 4, it is easy to manufacture and inexpensive to use a structure in which the gas discharge ports 16 and 17 are opened in the air diffusion tube 13 and the air diffusion tube 14 made of metal, resin or the like. preferable.
- the air supplied from the blower 5 is first supplied to the air supply ports 15A to 15D, and then sent to the gas supply pipe headers 12A to 12D.
- the gas is supplied to the air diffuser 13 and the air diffuser 14 and is discharged from the gas outlet 16 and the gas outlet 17.
- the air bubbles continuously or intermittently diffused from the gas discharge port 16 and the gas discharge port 17 of the diffuser 4 reach the membrane separation device 3 through the liquid of the water 7 to be treated, and are further separated. It passes through the vicinity of the membrane surface of the membrane module 11 and is discharged from the water surface.
- FIG. 4 shows an enlarged view of the arrangement portion of the diffuser tube 13 and the diffuser tube 14 in the perspective view of the diffuser device
- FIG. 5 shows the arrangement portion of the diffuser tube 13 and the diffuser tube 14 in the perspective view of the diffuser device.
- the figure seen in the horizontal direction (axial direction) is shown.
- the arrangement configuration of the air diffuser 13 and the air diffuser 14 in a state where the first air diffuser 20 and the second air diffuser 21 are laminated will be described. Adjacent when the first air diffuser 20 and the second air diffuser 21 (air diffuser tube group 13G and air diffuser tube group 14G) are viewed from the horizontal direction in the axial direction of the air diffusers 13 and 14 (in the direction of arrow H in FIG. 4).
- the distance between the axes (center distance) between the air diffuser 13 and the air diffuser 14 is d1
- the axis of the air diffuser 13 and the axis of the air diffuser 14 are
- d2 is the distance from the straight line projected onto the horizontal plane including the axis (sometimes referred to as the distance between the second air diffuser axes, see FIGS. 4 and 6)
- D is the outer diameter of the air diffuser 13 and the air diffuser 14.
- d1 1.1 ⁇ d2 to 5.0 ⁇ d2
- the 2nd air diffuser distance is the vertical direction (arrow of FIG. 5) of the 1st air diffuser 20 and the 2nd air diffuser 21 (air diffuser tube group 13G and air diffuser tube group 14G) which are arrange
- the “adjacent diffuser tube” in the case of arranging three or more stages of diffusers is provided in the diffuser of the stage adjacent to the diffuser including the diffuser tube when viewed from a certain diffuser tube.
- the diffusing tubes that are adjacent when viewed from the horizontal direction, that is, d2 is the smallest.
- the outer diameters of the tubes used for the diffuser tube 13 and the diffuser tube 14 are preferably 5 ⁇ D ⁇ 100 mm, and 20 ⁇ D ⁇ 50 mm in consideration of the element clearance arranged at the top of the diffuser 4.
- the hole diameter of the gas discharge port 16 and the gas discharge port 17 in the diffuser tube 13 and the diffuser tube 14 is preferably 1 to 15 mm, considering the viewpoint of uniform aeration and hole blockage. In this case, the thickness is more preferably 4 to 6 mm.
- the hole pitch of the adjacent gas discharge ports 16 and the hole pitch of the adjacent gas discharge ports 17 are preferably 10 to 500 mm, and more preferably 50 to 200 mm in view of uniform aeration. .
- the shape of the sludge flow discharge hole 18 in the air diffuser 13 and the air diffuser 14 can be arbitrarily set, such as a round hole or a long hole. When the diameters of the trachea 13 and the diffuser 14 are D, the hole diameter is 0.1D to 0.9D, and when sludge inflow and discharge are taken into account, 0.4D to 0. 6D is more preferable.
- the permeation flow rate (LV) of the membrane separation device 3 is preferably 0.01 to 1.5 m 3 / m 2 ⁇ day in the membrane separation activated sludge treatment. This permeation flow rate is an index indicating the permeation flow rate per day and per m 2 (m 3 / m 2 ⁇ day).
- the air diffuser 4 the air is supplied to one of the first air diffuser 20 and the second air diffuser 21, and the air diffuser supplied with air after a predetermined time has passed. Then, oxygen is supplied to the water to be treated 7 by repeating the step of supplying air to another air diffuser different from the air diffuser that stopped the air supply at regular intervals. That is, in the air diffuser 4, the air diffuser group 13G and the air diffuser group 14G are operated alternately.
- the bubbles due to oxygen from the diffuser 4 move upward to the water surface through the water 7 to be treated, so that an upward gas-liquid mixed flow composed of the water 7 to be treated and bubbles is generated.
- the membrane separation activated sludge treatment apparatus 1 the gas-liquid mixed flow is prevented from adhering to the membrane surface of the solid content by scrubbing the membrane surface of the separation membrane module 11, and the membrane surface is rapidly clogged. Can be prevented.
- the first air diffuser 20 and the second air diffuser 21 are operated alternately, and the first air diffuser 20 and the second air diffuser 21 are continuously operated from different positions. By performing a good aeration, it is possible to supply oxygen uniformly to the separation membrane module 11 with a high density.
- the aeration condition of the aeration device 4 is preferably aeration in the range of 50 to 300 m 3 / m 2 / hr at the aeration linear velocity.
- This aeration linear velocity is an index indicating the amount of air (m 3 / hr.) Diffused per 1 m 2 of the membrane separation device projection area of the amount of air diffused from the diffuser 4.
- the MLSS (biological reaction tank suspended solids) concentration of the water to be treated 7 in the membrane separation tank 2 is preferably set to 3000 to 15000 mg / L.
- MLSS concentration is an alternative indicator of microbial concentration.
- the MLSS concentration is more preferably 7000 to 12000 mg / L.
- the membrane separation device 3 and the air diffuser 4 connected to the blower 5 are provided in the membrane separation tank 2, and the membrane separation device 3 sucks and filters the water 7 to be treated by the suction pump 6.
- the water 7 to be treated is subjected to solid-liquid separation.
- the transmembrane pressure difference is measured by the pressure gauge 8 installed between the membrane separation device 3 and the suction pump 6, and the value of the pressure gauge 8 is monitored.
- the operation management of the membrane separation device 3 is possible.
- the first air diffuser 20 and the second air diffuser 21 are stacked in two stages, that is, the air diffuser group 13G and the air diffuser group 14G are stacked in two stages and adjacent to each other.
- the mode in which the first air diffuser 20 and the second air diffuser 21 are stacked and arranged in two stages has been described. There may be.
- air is supplied to one of the air diffusers, and the air supply to the air diffuser that has supplied air after a predetermined time has elapsed is stopped. Thereafter, the step of supplying air to one of the other air diffusers different from the air diffuser that has stopped supplying air can be repeated at regular intervals.
- oxygen can be uniformly supplied to the separation membrane module 11 with high density.
- the diffuser tube group 13G is provided in the 1st diffuser 20, and the diffuser tube group 14G is provided in the 2nd diffuser 21, and the diffuser tube group 13G and the diffuser tube group 14G are laminated
- a plurality of air diffuser groups are stacked in a single air diffuser in a plurality of stages in the vertical direction so that adjacent air diffuser tubes are not aligned on the vertical line, for example, a staggered arrangement Good.
- a plurality of diffuser tubes are arranged side by side in the horizontal direction, and a plurality of diffuser tube groups composed of the plurality of diffuser tubes arranged in the horizontal direction are arranged in a plurality of stages in the vertical direction.
- the gas supply pipe header may be arranged so as to supply gas to each air diffuser through a single air supply port of the gas supply pipe header.
- a means for switching the flow path of the gas supplied into the gas supply pipe header such as a valve is provided, so that the air is diffused by a group of diffused pipes stacked vertically. You may make it comprise so that change is possible.
- a plurality of air diffusers 13 are disposed between the gas supply pipe headers 12A and 12B, and a plurality of air diffusers 14 are disposed between the gas supply pipe headers 12C and 12D.
- the aspect which comprises the 2nd air diffuser 21 was demonstrated, it is the aspect which provides a gas supply pipe header only in the one side of the air diffuser 13 and the air diffuser 14 of the 1st air diffuser 20 and the 2nd air diffuser 21. It doesn't matter.
- Example 1 In Example 1, specific dimensions were set in the membrane separation activated sludge treatment apparatus 1 described above, and operation was performed under predetermined conditions.
- a hollow fiber membrane module as a separation membrane module 11 (trade name: SADF membrane, manufactured by Mitsubishi Rayon Co., Ltd .: hollow fiber) in which a polyethylene hollow fiber membrane for microfiltration with an average pore size of 0.1 ⁇ m is developed and fixed as a separation membrane in a screen shape.
- the module length in the fiber axis direction of the membrane is 125 cm; the membrane area is 25 m 2, and the 11 modules are arranged in the horizontal direction so that the center distance between adjacent modules is 4.5 cm, and the length is 130 cm, the width is 75 cm, and the height is 210 cm.
- the membrane separation device 3 placed in a frame was immersed in the water 7 to be treated.
- the first air diffuser 20 is formed by branching and providing six air diffuser tubes 13 installed on the same plane of the gas supply pipe headers 12A and 12B (in addition, a plurality of gas diffuser tubes arranged in the horizontal direction are arranged in six lines).
- a diffuser tube group 13G is constituted by the diffuser tube 13).
- the 2nd air diffuser 21 was comprised by branching from each of the gas supply pipe headers 12C and 12D, and providing the six air diffusion pipes 14 installed on the same plane of the gas supply pipe headers 12C and 12D.
- a diffuser tube group 14G is composed of six diffuser tubes 14 arranged side by side in the horizontal direction).
- the diameters of the air supply ports 15A to 15D were 32 mm, and air was supplied evenly to the gas supply pipe headers 12A to 12D, respectively.
- As the gas supply pipe headers 12A to 12D square pipes having an outer diameter of 50 mm were used, and the gas supply pipe headers facing each other were connected by a diffuser pipe.
- the distance d1 between the trachea axes is set to 4.8 cm, and when the first air diffuser 20 and the second air diffuser 21 are stacked and installed, the air diffuser 13 and the air diffuser 14 adjacent to each other when viewed from the vertical direction are set.
- the distance between the second air diffuser tubes is set to 2.7 cm, and the air diffuser 13 and the air diffuser 14 are made of stainless steel having an outer diameter of 2.7 cm, an inner diameter of 2.4 cm, and a length of 114.5 cm.
- the diffuser pipe 13 and the diffuser pipe 14 each have 22 circular gas discharge ports 16 and 17 each having a diameter of 0.4 cm on the uppermost surface and an interval of 5 cm between the discharge ports, and a sludge flow discharge hole 18 on the lowermost surface. As described above, one elongated hole having a width of 1.5 cm and a length of 5 cm was provided in the central portion.
- the blower 5 was used to supply the aeration tube 13 and the aeration tube 14 at 140 L / min and aeration linear velocity of 150 m 3 / m 2 / hr.
- the filtration process was continued for one month with intermittent operation for 1 minute. And the continuous operation was performed for one month, measuring the transmembrane differential pressure at the time of suction filtration with the pressure gauge 8 installed between the membrane separator 3 and the suction pump 6.
- FIG. 9 shows the operation results of the membrane separation activated sludge treatment apparatus 1 according to Example 1.
- the diamond-shaped plots in the figure show the operation results of Example 1.
- the membrane separation activated sludge treatment apparatus 1 according to Example 1 no increase in transmembrane pressure difference was observed, and stable operation was possible while maintaining the initial differential pressure of 6 kPa. Further, when the membrane separation device 3 was pulled up and visually confirmed, the separation membrane mounted on the membrane separation device 3 was maintained at the initial level without adhesion of sludge.
- Example 2 the dimension setting of each part is changed from Example 1 above, and the membrane separation device 3 is immersed in activated sludge under the same conditions as in Example 1 for the aeration condition and filtration condition, and the suction pump 6 was used for driving.
- the separation membrane module 11 used in the membrane separation device 3 was the same as that used in Example 1.
- the air diffuser 4 four gas supply pipe headers 12A to 12D having four air supply ports 15A to 15D are prepared and branched from the gas supply pipe headers 12A and 12B, respectively.
- the first diffuser 20 is configured by providing six diffuser tubes 13 installed on the same plane of 12B (in addition, the diffuser tube group 13G is composed of six diffuser tubes 13 arranged side by side in the horizontal direction. Configured).
- the 2nd air diffuser 21 was comprised by branching from each of the gas supply pipe headers 12C and 12D, and providing the six air diffusion pipes 14 installed on the same plane of the gas supply pipe headers 12C and 12D.
- a diffuser tube group 14G is composed of six diffuser tubes 14 arranged side by side in the horizontal direction).
- the diameters of the air supply ports 15A to 15D were 32 mm, and air was supplied evenly to the gas supply pipe headers 12A to 12D, respectively.
- As the gas supply pipe headers 12A to 12D square pipes having an outer diameter of 50 mm were used, and the gas supply pipe headers facing each other were connected by a diffuser pipe.
- the distance d1 is set to 11 cm and the first air diffuser 20 and the second air diffuser 21 are stacked and installed
- the second distance between the adjacent air diffuser 13 and the air diffuser 14 seen from the vertical direction is shown.
- the distance d2 between the diffuser tubes is set to 4.5 cm
- the diffuser tube 13 and diffuser tube 14 are 12 stainless steel pipes having an outer diameter of 2.7 cm, an inner diameter of 2.4 cm, and a length of 114.5 cm. They were used so that their longitudinal directions were parallel to the longitudinal direction of the hollow fiber membrane.
- the diffuser pipe 13 and the diffuser pipe 14 each have 22 circular gas discharge ports 16 and 17 each having a diameter of 0.4 cm on the uppermost surface and an interval of 5 cm between the discharge ports, and a sludge flow discharge hole 18 on the lowermost surface. As described above, one elongated hole having a width of 1.5 cm and a length of 5 cm was provided in the central portion.
- FIG. 9 shows the operation results of the membrane separation activated sludge treatment apparatus 1 according to Example 2.
- the plots with square marks in the figure show the operation results of Example 2.
- no increase in transmembrane pressure difference was observed, and stable operation was possible while maintaining the initial pressure difference of 6 kPa.
- the membrane separation device 3 was pulled up and visually confirmed, the separation membrane mounted on the membrane separation device 3 was maintained at the initial level without adhesion of sludge.
- Example 3 the dimension setting of each part was changed from the said Example 1, the membrane separation apparatus 3 was immersed in activated sludge on the conditions similar to Example 1 for aeration conditions and filtration conditions, and a suction pump was used. Used to drive.
- the air diffuser 4 four gas supply pipe headers 12A to 12D having four air supply ports 15A to 15D are prepared and branched from the gas supply pipe headers 12A and 12B, respectively.
- the first diffuser 20 is configured by providing six diffuser tubes 13 installed on the same plane of 12B (in addition, the diffuser tube group 13G is composed of six diffuser tubes 13 arranged side by side in the horizontal direction. Configured).
- the 2nd air diffuser 21 was comprised by branching from each of the gas supply pipe headers 12C and 12D, and providing the six air diffusion pipes 14 installed on the same plane of the gas supply pipe headers 12C and 12D.
- a diffuser tube group 14G is composed of six diffuser tubes 14 arranged side by side in the horizontal direction).
- the diameters of the air supply ports 15A to 15D were 32 mm, and air was supplied evenly to the gas supply pipe headers 12A to 12D, respectively.
- As the gas supply pipe headers 12A to 12D square pipes having an outer diameter of 50 mm were used, and the gas supply pipe headers facing each other were connected by a diffuser pipe.
- the first diffuser tube axis between the diffuser tubes 13 and 14 adjacent to each other when viewed from the horizontal direction when the first diffuser device 20 and the second diffuser device 21 are stacked and installed.
- the tube distance d1 is set to 5.1 cm and the first air diffuser 20 and the second air diffuser 21 are stacked and installed, the distance between the adjacent air diffuser 13 and the air diffuser 14 seen from the vertical direction is set.
- the distance d2 between the second air diffuser tubes is set to 1.2 cm.
- the stainless steel pipe 12 having an outer diameter of 2.7 cm, an inner diameter of 2.4 cm, and a length of 114.5 cm is used.
- the books were used and arranged so that the longitudinal direction thereof was parallel to the longitudinal direction of the hollow fiber membrane.
- the diffuser pipe 13 and the diffuser pipe 14 each have 22 circular gas discharge ports 16 and 17 each having a diameter of 0.4 cm on the uppermost surface and an interval of 5 cm between the discharge ports, and a sludge flow discharge hole 18 on the lowermost surface.
- one elongated hole having a width of 1.5 cm and a length of 5 cm was provided in the central portion.
- the operation result of the membrane separation activated sludge treatment apparatus 1 according to Example 3 is shown in FIG.
- the triangle marks in the figure show the operation results of Example 3.
- a slight increase in the transmembrane pressure difference was observed, and after 30 days, a 3 kPa increase was observed from the initial pressure difference. Stable operation was possible.
- the membrane separation device 3 was pulled up and visually confirmed, the separation membrane mounted on the membrane separation device 3 did not adhere to sludge and maintained the initial level.
- Example 4 the dimension setting of each part was changed from Example 1 above, and the membrane separation device 3 was immersed in activated sludge under the same conditions as in Example 1 for the aeration condition and filtration condition, and the suction pump 6 Driving was performed using.
- the air diffuser 4 is arranged below the membrane separation device 3, and four gas supply pipe headers 12A to 12D having four air supply ports 15A to 15D are prepared and branched from the gas supply pipe headers 12A and 12B, respectively.
- the six air diffusers 13 installed on the same plane of the gas supply pipe headers 12A and 12B are provided to form the first air diffuser 20 (note that a plurality of diffusers arranged in the horizontal direction are arranged in parallel.
- the trachea 13 constitutes a diffuser tube group 13G).
- the 2nd air diffuser 21 was comprised by branching from each of the gas supply pipe headers 12C and 12D, and providing the six air diffusion pipes 14 installed on the same plane of the gas supply pipe headers 12C and 12D.
- a diffuser tube group 14G is composed of six diffuser tubes 14 arranged side by side in the horizontal direction).
- the diameters of the air supply ports 15A to 15D were 32 mm, and air was supplied evenly to the gas supply pipe headers 12A to 12D, respectively.
- As the gas supply pipe headers 12A to 12D square pipes having an outer diameter of 50 mm were used, and the gas supply pipe headers facing each other were connected by a diffuser pipe.
- the air diffuser 13 and the 2nd air diffuser of the 1st air diffuser 20 which adjoins seeing from the horizontal direction.
- the vertical distance when the first air diffuser axis distance d1 between the air diffuser 14 and the air diffuser 14 is set to 3.8 cm and the first air diffuser 20 and the second air diffuser 21 are stacked and installed.
- the distance d2 between the second air diffuser axes between the air diffuser 13 of the first air diffuser 20 and the air diffuser 14 adjacent to the second air diffuser 21 is set to be 2.7 cm.
- each air diffuser has 22 circular gas outlets with a diameter of ⁇ 0.4 cm on the uppermost surface, the interval between the outlets is 5 cm, and the lowermost surface is a sludge flow discharge hole 18 with a width of 1.5 cm and a length of 5 cm.
- One long hole was provided at the center.
- d1 1.27D and d1> 1.3D are satisfied between the outer diameter D of the air diffuser, the first air diffuser axis distance d1, and the second air diffuser axis distance d2.
- d1 1.41d2
- d1 1.1 ⁇ d2 to 5.0 ⁇ d2 is satisfied.
- a pressure gauge was installed between the membrane separator and the suction pump, and continuous operation was performed for one month while measuring the transmembrane pressure difference during suction filtration.
- FIG. 9 shows the operation result of the membrane separation activated sludge treatment apparatus according to Example 4.
- the x-marked plot in the figure shows the operation result of Example 4.
- the transmembrane pressure difference gradually increased from the past 20 days, and after 30 days, the pressure difference increased by 30 kPa from the initial pressure difference. Observed. Further, when the membrane separator was pulled up and visually confirmed, some sludge was observed on the separation membrane mounted on the membrane separator.
- d2 is the distance from the straight line projected onto the horizontal plane including the axis of (diffusion tube distance) d2 and the outer diameters of the diffusion tube 13 and the diffusion tube 14 are D. It was confirmed that stable filtration can be continued for a longer period when the diffuser 13 and the diffuser 14 are arranged so as to satisfy the relationship of 0 ⁇ d2, d1> 1.3D.
- the solid-liquid separation device of the present invention has less obstruction of the gas discharge port of the air diffuser even after long-term filtration. Since it can be continued, it is useful, for example, as a membrane separation activated sludge treatment apparatus.
- Membrane separation activated sludge treatment equipment solid-liquid separation equipment
- Membrane separator 4 Air diffuser 9
- Hollow fiber membrane 10 Filtration membrane sheet 11
- Separation membrane module 12 Gas supply pipe header 13, 14 Air diffuser 13G, 14G Air diffuser group 16, 17 Gas outlet 20
Abstract
Description
本願は、2010年6月1日に、日本に出願された特願2010-125927号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a solid-liquid separation apparatus that performs solid-liquid separation in water treatment and an operation method thereof.
This application claims priority based on Japanese Patent Application No. 2010-125927 filed in Japan on June 1, 2010, the contents of which are incorporated herein by reference.
そこで、これに対し特許文献1には、分離膜モジュールの水平方向の断面積に応じて散気装置の気体吐出口数を設定する提案がなされている。 However, even in the case of drainage filtration using a membrane module, it is difficult to keep the bubbles discharged from the air diffuser uniformly applied to the separation membrane when the operation is performed over a long period of time. However, there is a problem that frequent maintenance work is required to recover the reduced filtration flow rate because the pores on the membrane surface are blocked and the filtration flow rate is lowered.
In view of this,
前記一対の散気管群のうちの一方の散気管の軸線と、前記他方の散気管の軸線を前記一方の散気管の軸線を含む水平面上に射影した直線との距離をd2、
前記散気管の外径をD、としたときに、
d1=1.1×d2~5.0×d2を満足し、かつ、d1>1.3Dを満足するように前記散気管が配置されていることが好ましい。 [4] The solid-liquid separator according to [1] to [3] is adjacent when the diffuser tube group arranged in a plurality of stages is viewed from the horizontal direction in the axial direction of the diffuser tube. , The distance between the axes of the diffuser tubes, which is the distance between the axes of the diffuser tubes of the pair of diffuser tubes,
A distance between an axis of one of the pair of air diffuser groups and a straight line obtained by projecting an axis of the other air diffuser onto a horizontal plane including the axis of the one air diffuser;
When the outer diameter of the air diffuser is D,
It is preferable that the air diffuser is disposed so as to satisfy d1 = 1.1 × d2 to 5.0 × d2 and d1> 1.3D.
を一定期間毎に繰り返す固液分離装置の運転方法。である。 [5] A second aspect of the present invention is a method for operating a solid-liquid separation device using the solid-liquid separation device according to any one of [1] to [4], wherein the plurality of aeration tubes A step of supplying air to one diffuser tube group, a step of stopping air supply to the diffuser tube group supplied with the air, and another diffuser tube different from the diffuser tube group stopped with the air supply. Supplying air to one of the trachea groups;
The operation method of the solid-liquid separator which repeats every fixed period. It is.
図1は本発明の実施の形態に係る固液分離装置である膜分離活性汚泥処理装置1の概略構成図である。本実施形態の膜分離活性汚泥処理装置1は、膜分離槽2内に設けられた膜分離装置3と、膜洗浄用の散気装置4とを備えている。散気装置4にはブロワー5が接続され、膜分離装置3には吸引ポンプ6が接続されている。膜分離装置3は、吸引ポンプ6により膜分離槽2内の被処理水7を吸引濾過することで固液分離し処理水を得る。また、膜分離装置3と吸引ポンプ6との間には圧力計8が設けられており、膜分離活性汚泥処理装置1の運転中には圧力計8により膜分離装置3における膜間差圧が測定されている。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a membrane separation activated
上記の通り、本発明においては、同一水平面上に配された複数の散気管13で構成される散気管群が複数段設けることを特徴としているが、さらに、これらの散気管群は隣接する段の散気管同士が鉛直線上に並ばないように積層して配置することを特徴としている。
隣接する散気管同士を鉛直方向同一面上に配置した場合、運転中に散気管内を気体が通過すること等に伴い散気管が振動するが、これに伴い、隣接する散気管同士が極端に近づくか最悪接触するケースがあり、散気管間の液体流路を十分確保することができず、均一な散気ができなくなるおそれがある。一方、隣接しない散気管群についてはこの点考慮する必要はなく、例えば横から見た場合に千鳥格子に散気管を配置してもよい。 The plurality of
As described above, the present invention is characterized in that a plurality of diffuser tube groups each composed of a plurality of
When adjacent diffuser tubes are arranged on the same plane in the vertical direction, the diffuser tubes vibrate as the gas passes through the diffuser tube during operation, etc. There are cases in which they approach each other or make the worst contact, so that a sufficient liquid flow path between the diffuser tubes cannot be secured, and there is a possibility that uniform aeration cannot be performed. On the other hand, it is not necessary to consider this point for non-adjacent diffuser groups. For example, diffuser tubes may be arranged in a staggered pattern when viewed from the side.
また、本発明においてはすべての散気管の組においてd1およびd2は、同じである必要はなく、例えば、散気管のピッチが異なる散気装置を用いてもよい。
このとき、d1及びd2はすべての散気装置においてd1=1.1×d2~5.0×d2、d1>1.3Dの関係を満足することが好ましい。
さらに、散気装置を3段以上配する場合などにおける「隣接する散気管」とは、ある散気管から見て、当該散気管を含む散気装置と隣接する段の散気装置に設けられた散気管のうち、水平方向から見た場合に隣接している、すなわち、d2が最も小さくなる散気管をいう。
d1=1.1d2より小さくなる場合、隣接する散気管の隙間がなくなり散気管間を流れる流路が狭くなり均一な散気ができなくなる。また、d1=5.0d2より大きくなると隣接する散気管間の隙間が大きくなり、均一な散気ができなくなる。また、d1<1.3Dとなる場合、散気管間の隙間が小さくなり、散気管間を流れる流路が狭くなり均一な散気ができなくなる。 In addition, the 2nd air diffuser distance is the vertical direction (arrow of FIG. 5) of the
Further, in the present invention, d1 and d2 do not have to be the same in all sets of air diffusers, and for example, air diffusers having different air diffuser pitches may be used.
At this time, it is preferable that d1 and d2 satisfy the relationship of d1 = 1.1 × d2 to 5.0 × d2 and d1> 1.3D in all the diffusers.
Further, the “adjacent diffuser tube” in the case of arranging three or more stages of diffusers is provided in the diffuser of the stage adjacent to the diffuser including the diffuser tube when viewed from a certain diffuser tube. Among the diffusing tubes, the diffusing tubes that are adjacent when viewed from the horizontal direction, that is, d2 is the smallest.
When d1 = 1.1d2 or less, there is no gap between adjacent diffuser tubes, the flow path between the diffuser tubes becomes narrow, and uniform aeration cannot be performed. On the other hand, when d1 is larger than 5.0d2, a gap between adjacent diffuser tubes becomes large, and uniform aeration cannot be performed. Further, when d1 <1.3D, the gap between the diffuser tubes becomes small, the flow path flowing between the diffuser tubes becomes narrow, and uniform aeration cannot be performed.
そして、ここで、上記のように、第1散気装置20と第2散気装置21を交互に稼働し、第1散気装置20と第2散気装置21とで異なった位置から継続的な散気を行なうことにより、分離膜モジュール11に対して密度が高く均一に酸素を供給できるようになっている。
なお、散気装置4の散気条件としては、曝気線速度で50~300m3/m2/hrの範囲で散気することが好ましい。この曝気線速度は、散気装置4から散気する空気量の膜分離装置投影面積1m2当たりに散気する空気量(m3/hr.)を示す指標である。なお、本実施形態では、第1散気装置20と第2散気装置21を交互に稼働するが双方を稼働して酸素供給を行ってもよい。 Here, the bubbles due to oxygen from the
Then, as described above, the
The aeration condition of the
そして、本実施形態では、第1散気装置20と第2散気装置21を2段に積層して配置する、つまり、散気管群13Gと散気管群14Gを2段に積層して、隣接する段の散気管同士(13,14)が鉛直線上に並ばないように配置している。つまり、隣接する散気装置の散気管における気体噴出口が、鉛直方向からみた場合に重ならないように配置されている。これによれば、散気管群13G及び散気管群14Gにおいて散気管13、14の数が過剰に多くなり散気管13、14の径が狭くなるのを防ぎつつ、気体吐出口16、17の数も確保できるので、曝気の不均一性を解消でき、かつ、長期にわたる濾過を行っても散気管の気体吐出口の閉塞を少なく抑えることができ、その結果、懸濁物による膜面の細孔の閉塞を少なく抑え、安定した濾過が長期間継続可能となる。 As described above, in this embodiment, the
In the present embodiment, the
<実施例1>
実施例1では、上述した膜分離活性汚泥処理装置1に具体的な寸法を設定し、所定の条件で運転を実施した。 Examples of the present invention will be described below.
<Example 1>
In Example 1, specific dimensions were set in the membrane separation activated
給気口15A~15Dの口径は32mmとし、気体供給管ヘッダー12A~12Dへそれぞれ均等に空気を送気するようにした。気体供給管ヘッダー12A~12Dは外径50mm角パイプを使用し、向かい合う気体供給管ヘッダーを散気管で接続した。 In the
The diameters of the
次に、実施例2では、上記実施例1から各部の寸法設定を変更し、散気条件、ろ過条件については実施例1と同様の条件にて膜分離装置3を活性汚泥に浸漬し吸引ポンプ6を使用して運転を行った。膜分離装置3で使用する分離膜モジュール11を実施例1と同様のものを使用した。 <Example 2>
Next, in Example 2, the dimension setting of each part is changed from Example 1 above, and the
給気口15A~15Dの口径は32mmとし、気体供給管ヘッダー12A~12Dへそれぞれ均等に空気を送気するようにした。気体供給管ヘッダー12A~12Dは外径50mm角パイプを使用し、向かい合う気体供給管ヘッダーを散気管で接続した。 In the
The diameters of the
次に、実施例3では、上記実施例1から各部の寸法設定を変更し、散気条件、ろ過条件を実施例1と同様の条件にて膜分離装置3を活性汚泥に浸漬し吸引ポンプを使用して運転を行った。 <Example 3>
Next, in Example 3, the dimension setting of each part was changed from the said Example 1, the
給気口15A~15Dの口径は32mmとし、気体供給管ヘッダー12A~12Dへそれぞれ均等に空気を送気するようにした。気体供給管ヘッダー12A~12Dは外径50mm角パイプを使用し、向かい合う気体供給管ヘッダーを散気管で接続した。 In the
The diameters of the
次に、実施例4では、上記実施例1から各部の寸法設定を変更し、散気条件、ろ過条件を実施例1と同様の条件にて膜分離装置3を活性汚泥に浸漬し吸引ポンプ6を使用して運転を行った。 <Example 4>
Next, in Example 4, the dimension setting of each part was changed from Example 1 above, and the
給気口15A~15Dの口径は32mmとし、気体供給管ヘッダー12A~12Dへそれぞれ均等に空気を送気するようにした。気体供給管ヘッダー12A~12Dは外径50mm角パイプを使用し、向かい合う気体供給管ヘッダーを散気管で接続した。 The
The diameters of the
この結果から、複数段に積層して配置された第1散気装置20と第2散気装置21を水平方向から散気管13、14の軸方向に見た場合に隣接する、散気管13と散気管14との間の軸間距離(第1散気管距離)をd1、前記一対の散気管群のうちの一方の散気管の軸線と、前記他方の散気管の軸線を前記一方の散気管の軸線を含む水平面上に射影した直線との距離(第2散気管距離)をd2、散気管13および散気管14の外径をDとしたときに、d1=1.1×d2~5.0×d2、d1>1.3Dの関係を満足するように、散気管13および散気管14が配置するようにした場合には、より長期にわたる安定した濾過が継続できることが確認できた。 In the operation results and observation results of Examples 1 to 4 described above, it was confirmed that the increase in the transmembrane pressure difference was suppressed over a relatively long period for Example 3, but Examples 1 and 2 and 3 confirmed that it was possible to suppress the increase in the transmembrane pressure difference over a longer period than in Example 4.
From this result, when the
3 膜分離装置
4 散気装置
9 中空糸膜
10 濾過膜シート
11 分離膜モジュール
12 気体供給管ヘッダー
13,14 散気管
13G、14G 散気管群
16,17 気体吐出口
20 第1散気装置(散気装置)
21 第2散気装置(散気装置) 1 Membrane separation activated sludge treatment equipment (solid-liquid separation equipment)
DESCRIPTION OF
21 2nd air diffuser (air diffuser)
Claims (5)
- 濾過膜シートを複数枚並列して配置した分離膜モジュールを間隔を隔てて複数配置した膜分離装置の前記分離膜モジュールの下方に、気体吐出口を有する散気管を複数備えるとともに該複数の散気管をそれぞれ平行に設ける散気装置を設け、前記散気管に気体を供給し、前記気体吐出口から前記分離膜モジュールに対して散気を行なう固液分離装置において、
前記散気管を水平方向に複数並べて配置し、該水平方向に並べて配置された複数の散気管からなる散気管群を上下方向に複数段、かつ、隣接する段の散気管同士が鉛直線上に並ばないように積層して配置し、それぞれの散気管群に対して給気を切り替える手段を有する固液分離装置。 A plurality of diffusion tubes having gas discharge ports are provided below the separation membrane module of the membrane separation device in which a plurality of separation membrane modules in which a plurality of filtration membrane sheets are arranged in parallel are arranged at intervals. In a solid-liquid separation device that provides an air diffuser provided in parallel with each other, supplies gas to the air diffuser, and diffuses air from the gas discharge port to the separation membrane module,
A plurality of the diffuser tubes are arranged side by side in the horizontal direction, a plurality of diffuser tube groups composed of a plurality of diffuser tubes arranged in the horizontal direction are arranged in a plurality of levels in the vertical direction, and the diffuser tubes in adjacent stages are arranged on the vertical line. A solid-liquid separation device having means arranged so as to be stacked so as to switch the air supply to each of the diffuser tube groups. - 前記散気装置を、複数の前記散気管群のうちの少なくとも一つの散気管群と、該散気管群の各散気管に同一平面上で連通し各散気管に気体を供給する少なくとも一本の気体供給管ヘッダーとで構成される複数の散気装置で構成し、
前記複数の散気装置を上下方向に複数段に積層して設置することで、前記散気管群を上下方向に、隣接する段の散気管同士が鉛直線上に並ばないように積層して配置したことを特徴とする請求項1に記載の固液分離装置。 The air diffuser is connected to at least one air diffuser group of the plurality of air diffuser tube groups and the air diffuser tubes of the air diffuser tube group on the same plane, and supplies at least one gas to each air diffuser tube. Consists of a plurality of air diffusers composed of a gas supply pipe header,
By arranging the plurality of air diffusers in a plurality of stages in the vertical direction, the air diffuser groups are arranged in a vertical direction so that adjacent stages of the air diffusers do not line up on the vertical line. The solid-liquid separator according to claim 1. - 前記濾過膜シートが、多数の中空糸膜を平行に並べてなる濾過膜シートである請求項1又は2に記載の固液分離装置。 The solid-liquid separation device according to claim 1 or 2, wherein the filtration membrane sheet is a filtration membrane sheet in which a large number of hollow fiber membranes are arranged in parallel.
- 複数段に積層して配置された前記散気管群を水平方向から前記散気管の軸方向に見た場合に隣接する、一対の散気管群の散気管の軸間距離である散気管軸間距離をd1、
前記一対の散気管群のうちの一方の散気管の軸線と、前記他方の散気管の軸線を前記一方の散気管の軸線を含む水平面上に射影した直線との距離をd2、
前記散気管の外径をD、としたときに、
d1=1.1×d2~5.0×d2を満足し、かつ、d1>1.3Dを満足するように前記散気管が配置されている請求項1~3のいずれか1項に記載の固液分離装置。 When the diffuser tube group arranged in a plurality of stages is viewed from the horizontal direction in the axial direction of the diffuser tube, the adjacent distance between the diffuser tubes is the interaxial distance between the diffuser tubes of the pair of diffuser tube groups D1,
A distance between an axis of one of the pair of air diffuser groups and a straight line obtained by projecting an axis of the other air diffuser onto a horizontal plane including the axis of the one air diffuser;
When the outer diameter of the air diffuser is D,
4. The air diffuser according to claim 1, wherein the air diffuser is arranged so as to satisfy d1 = 1.1 × d2 to 5.0 × d2 and satisfy d1> 1.3D. Solid-liquid separator. - 請求項1~4のいずれか1項に記載の固液分離装置を用いた固液分離装置の運転方法であって、
前記複数の散気管群のうち、一つの散気管群に空気を供給する工程と、
前記空気を供給した散気管群への空気供給を停止する工程と、
前記空気供給を停止した散気管群とは異なる他の散気管群のうちの一つの散気管群に空気を供給する工程と、
を一定期間毎に繰り返す固液分離装置の運転方法。 A method for operating a solid-liquid separator using the solid-liquid separator according to any one of claims 1 to 4,
Supplying air to one of the plurality of air diffuser groups;
Stopping air supply to the group of air diffusers that supplied the air;
Supplying air to one of the other diffusing tube groups different from the diffusing tube group that has stopped the air supply;
The operation method of the solid-liquid separator which repeats every fixed period.
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CN201190000639.XU CN203379815U (en) | 2010-06-01 | 2011-06-01 | Solid-liquid separating device |
JP2011526314A JP5982822B2 (en) | 2010-06-01 | 2011-06-01 | Solid-liquid separator and operation method thereof |
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CN (1) | CN203379815U (en) |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07178321A (en) * | 1993-11-12 | 1995-07-18 | Mitsubishi Rayon Co Ltd | Hollow-fiber membrane module assembly |
JPH07185271A (en) * | 1993-12-24 | 1995-07-25 | Kurita Water Ind Ltd | Immersion membrane apparatus |
JPH07185270A (en) * | 1993-12-24 | 1995-07-25 | Kurita Water Ind Ltd | Immersion membrane apparatus |
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JP3322206B2 (en) * | 1998-03-06 | 2002-09-09 | 栗田工業株式会社 | Immersion type membrane separation device |
JP2000126558A (en) * | 1998-10-28 | 2000-05-09 | Nitto Denko Corp | Immersion-type film separation device and method for cleaning fouled water |
JP4361432B2 (en) * | 2004-07-02 | 2009-11-11 | 株式会社西原 | Water treatment equipment |
TWI284119B (en) * | 2004-12-22 | 2007-07-21 | Ind Tech Res Inst | Biological membrane filtration system for water treatment and water treatment process using the same |
JP5330658B2 (en) * | 2007-07-24 | 2013-10-30 | 三菱重工業株式会社 | Aeration equipment |
JP2010104932A (en) * | 2008-10-31 | 2010-05-13 | Suido Kiko Kaisha Ltd | Air diffuser |
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2011
- 2011-06-01 CN CN201190000639.XU patent/CN203379815U/en not_active Expired - Fee Related
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07178321A (en) * | 1993-11-12 | 1995-07-18 | Mitsubishi Rayon Co Ltd | Hollow-fiber membrane module assembly |
JPH07185271A (en) * | 1993-12-24 | 1995-07-25 | Kurita Water Ind Ltd | Immersion membrane apparatus |
JPH07185270A (en) * | 1993-12-24 | 1995-07-25 | Kurita Water Ind Ltd | Immersion membrane apparatus |
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CN203379815U (en) | 2014-01-08 |
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TWI462881B (en) | 2014-12-01 |
TW201210948A (en) | 2012-03-16 |
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