WO2017086267A1 - 膜モジュール及び水処理システム - Google Patents

膜モジュール及び水処理システム Download PDF

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Publication number
WO2017086267A1
WO2017086267A1 PCT/JP2016/083676 JP2016083676W WO2017086267A1 WO 2017086267 A1 WO2017086267 A1 WO 2017086267A1 JP 2016083676 W JP2016083676 W JP 2016083676W WO 2017086267 A1 WO2017086267 A1 WO 2017086267A1
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WO
WIPO (PCT)
Prior art keywords
water
casing
space
permeated
treated
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PCT/JP2016/083676
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English (en)
French (fr)
Japanese (ja)
Inventor
誠人 尾田
寿生 萩本
水谷　洋
Original Assignee
三菱重工環境・化学エンジニアリング株式会社
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.)
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Application filed by 三菱重工環境・化学エンジニアリング株式会社 filed Critical 三菱重工環境・化学エンジニアリング株式会社
Priority to KR1020187013440A priority Critical patent/KR102066365B1/ko
Priority to CN201680065824.4A priority patent/CN108348861B/zh
Publication of WO2017086267A1 publication Critical patent/WO2017086267A1/ja

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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
    • B01D63/06—Tubular membrane modules
    • B01D63/069—Tubular membrane modules comprising a bundle of tubular membranes
    • 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
    • B01D63/06—Tubular membrane modules
    • 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2311/00—Details relating to membrane separation process operations and control
    • B01D2311/08—Specific process operations in the concentrate stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2325/00—Details relating to properties of membranes
    • B01D2325/36—Hydrophilic membranes
    • 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
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/007—Modular design

Definitions

  • the present invention relates to a membrane module and a water treatment system for treating organic wastewater such as human waste.
  • membrane separation such as MF (microfiltration) and UF (ultrafiltration) for solid-liquid separation.
  • MF microfiltration
  • UF ultrafiltration
  • the membrane separation device a plurality of membrane modules including a cylindrical casing and a plurality of tubular filtration membranes (hollow fiber membranes) accommodated in the casing are used, and raw water is circulated inside the tubular filtration membrane.
  • An apparatus using a filtration method is known (for example, see Patent Document 1).
  • the permeated water that has permeated through the tubular filtration membrane is sucked by a suction pump and stored in, for example, a storage tank and used as appropriate.
  • a plurality of membrane modules are placed vertically, that is, the permeate is taken out from the permeate discharge port provided in the upper part of the casing by arranging the casing so that the axis of the casing is along the vertical direction. It was general. The permeated water that permeated through the plurality of tubular filtration membranes stayed in the permeated water space inside the casing, and was then discharged from the permeated water discharge port provided in the upper part of the casing.
  • the permeate discharge port when the permeate discharge port is provided in the upper part of the casing, the permeate stays without being discharged from the permeate space in the casing when the flow of the water to be circulated stops. Thereby, there existed a subject that permeation water decayed. In addition, there is a problem that scale deposition and accumulation occur due to scale components (phosphate ions, calcium ions, magnesium ions, etc.) contained in the permeated water, resulting in problems such as nozzle clogging. Further, the permeated water staying causes a back pressure on the tubular filtration membrane, resulting in a decrease in FLUX (flow rate).
  • FLUX flow rate
  • An object of the present invention is to provide a membrane module and a water treatment system capable of suppressing permeation of permeated water and scale deposition.
  • the membrane module includes a cylindrical casing whose axis extends in the vertical direction, a first partition wall provided below the extending direction of the casing, A second partition provided above the extending direction of the casing, and extends vertically in the casing, one end connected to the first partition and the other connected to the second partition.
  • Permeated water that is defined by a plurality of tubular filtration membranes having a single-layer structure copolymerized with hydrophilic monomers, the casing, the first partition walls, and the second partition walls, and that has permeated the plurality of tubular filtration membranes.
  • the permeated water space into which the permeated water is introduced, and the permeated water discharge port provided at the lower part of the permeated water space for discharging the permeated water.
  • a lower header space that is a space below the first partition in the internal space of the casing, and a space above the second partition in the internal space of the casing. You may provide the upper header space which is space, the to-be-processed water inlet which supplies to-be-processed water to the said upper header space, and the concentrated water discharge port which discharges to-be-processed water from the said lower header space.
  • the water treatment system accommodates a biologically treated water tank that treats organic matter contained in the treated water and treated water discharged from the biologically treated water tank.
  • a membrane separation apparatus that has a raw water tank, a membrane module according to any one of (1) and (2), and that separates treated water supplied from the raw water tank into permeated water and concentrated water, and the concentrated water And a return line for returning the concentrated water to the biological treatment water tank, and the concentrated water is not returned to the raw water tank.
  • the membrane filtration membrane has hydrophilicity, so that the membrane surface flow rate can be lowered, so that the circulation flow rate of the water to be treated can be reduced.
  • natural water tank required in the case of a hydrophobic membrane become unnecessary.
  • the diameter of the pipe can be reduced by reducing the flow rate.
  • by reducing the flow rate it is possible to reduce equipment such as a flow meter.
  • the permeated water is discharged from the permeated water discharge port provided at the lower part.
  • permeated water does not stay in the permeated water space, and the permeated water can be prevented from decaying and scale deposition.
  • the tubular filtration membrane by forming the tubular filtration membrane with a hydrophilic material, it is possible to prevent damage due to drying of the tubular filtration membrane even when the flow of water to be treated stops.
  • the water treatment system 10 having the membrane module 1 of the first embodiment of the present invention includes a biological treatment water tank 11 for treating organic substances contained in the water to be treated W1 (organic wastewater including human waste and septic tank sludge), and a biological treatment water tank 11.
  • the biological treatment water tank 11 is a device that decomposes and removes BOD, nitrogen compounds, and the like in the liquid by the action of nitrifying bacteria and denitrifying bacteria, for example.
  • To-be-treated water tank 11 is supplied with treated water W ⁇ b> 1 through first pipe 15.
  • the biological treatment water tank 11 and the raw water tank 12 are connected by a second pipe 16.
  • the membrane separation device 13 includes a plurality of membrane modules 1.
  • the plurality of membrane modules 1 are arranged in parallel.
  • the plurality of membrane modules 1 are arranged vertically in the housing of the membrane separation device 13. That is, the axis A of the cylindrical casing 2 (see FIG. 2) of the membrane module 1 extends in the vertical direction.
  • the membrane module 1 has a casing 2 and a plurality of tubular filtration membranes 3 arranged inside the casing 2.
  • the membrane separation device 13 is a device that takes out the permeated water PW from the water to be treated W3 by using a method of filtering the water to be treated W3 while circulating it inside the tubular filtration membrane 3.
  • the raw water tank 12 and the membrane separation device 13 are connected via a raw water supply pipe 17.
  • a circulation pump 21 is provided in the raw water supply pipe 17.
  • the water to be treated W stored in the raw water tank 12 is supplied to the membrane separation device 13 while being pressurized by the circulation pump 21.
  • the permeated water PW separated from the membrane separation device 13 is introduced into the permeated water pipe 18.
  • the permeated water pipe 18 is connected to the storage tank 20. That is, the permeate outlet 9 (see FIG. 2) of the membrane module 1 is connected to the permeate pipe 18.
  • a suction pump 22 is provided in the permeate water pipe 18.
  • the concentrated water W4 separated from the permeated water PW and discharged from the membrane separation device 13 is returned to the biological treatment water tank 11 through the return pipe 19 (return line) except for excess sludge. That is, the concentrated water discharge port 8 (see FIG. 2) of the membrane module 1 is connected to the return pipe 19. Therefore, the concentrated water W4 is not returned to the raw water tank 12.
  • the treated water W2 discharged from the biological treatment water tank 11 returns to the biological treatment water tank 11 via the raw water tank 12 and the membrane separator 13. That is, the to-be-processed water W circulates through the piping of the water treatment system 10.
  • the plurality of membrane modules 1 are arranged in parallel. Specifically, the raw water supply pipe 17, the permeate water pipe 18, and the return pipe 19 are connected to each membrane module 1.
  • the membrane module 1 includes a cylindrical casing 2 and a plurality of tubular filtration membranes 3.
  • the casing 2 includes a cylindrical casing body 4, a first side wall 5 that closes a lower end of the casing body 4, a second side wall 6 that closes an upper end of the casing body 4, and a processing target formed on the casing body 4. It has a water introduction port 7, a concentrated water discharge port 8 formed in the casing body 4, and a permeate discharge port 9 formed in the casing body 4.
  • the membrane module 1 includes a first partition wall 30 and a second partition wall 31 that divide the inside of the casing 2 into three spaces.
  • a plurality of insertion holes 32 are formed in the first partition wall 30 and the second partition wall 31.
  • the insertion hole 32 is a hole that penetrates the first partition wall 30 and the second partition wall 31 in the plate thickness direction.
  • the inner diameter of the insertion hole 32 is slightly larger than the outer diameter of the tubular filtration membrane 3.
  • the plurality of tubular filtration membranes 3 extend in the vertical direction inside the casing 2, one end is connected to the first partition wall 30, and the other end is connected to the second partition wall 31.
  • the first partition 30 is a plate-shaped member, and is fixed below the extending direction of the casing 2 (on the first side wall 5 side).
  • a space surrounded by the casing body 4, the first partition wall 30, and the first side wall 5 is a lower header space S1.
  • the lower header space S ⁇ b> 1 is a space below the first partition wall 30 in the internal space of the casing 2.
  • the second partition wall 31 is a plate-shaped member, and is fixed above the extending direction of the casing 2 (on the second side wall 6 side).
  • a space surrounded by the casing body 4, the second partition wall 31 and the second side wall 6 is an upper header space S2.
  • the upper header space S ⁇ b> 2 is a space above the second partition wall 31 in the internal space of the casing 2.
  • the space surrounded by the casing body 4, the first partition wall 30, and the second partition wall 31 is a permeated water space S3.
  • the permeated water PW taken out from the plurality of tubular filtration membranes 3 is discharged into the permeated water space S ⁇ b> 3 and then introduced into the permeated water pipe 18 through the permeated water discharge port 9.
  • the treated water introduction port 7 is an opening that allows communication between the outside of the casing 2 and the lower header space S1.
  • the treated water inlet 7 is formed in the casing body 4.
  • the treated water introduction port 7 is provided between the first partition wall 30 and the first side wall 5 in the axis A direction of the casing 2.
  • the concentrated water discharge port 8 is an opening that allows communication between the outside of the casing 2 and the upper header space S2.
  • the concentrated water discharge port 8 is formed in the casing body 4.
  • the concentrated water discharge port 8 is provided between the second partition wall 31 and the second side wall 6 in the axis A direction of the casing 2.
  • the permeated water discharge port 9 is an opening that allows communication between the outside of the casing 2 and the permeated water space S3.
  • the permeated water discharge port 9 is formed in the casing body 4.
  • the permeate discharge port 9 is provided between the first partition wall 30 and the second partition wall 31 in the axis A direction of the casing 2.
  • the permeate discharge port 9 of the present embodiment is provided in the lower part of the permeate space S3. In other words, the permeated water discharge port 9 is provided slightly above the first partition wall 30.
  • the permeate discharge port 9 is preferably provided at the lower end of the permeate space S3.
  • the permeated water discharge port 9 is formed at a position where the permeated water PW that has passed through the plurality of tubular filtration membranes 3 can be discharged as much as possible without staying in the permeated water space S3. Moreover, the permeated water pipe 18 connected to the permeated water discharge port 9 is inclined downward. That is, the permeated water pipe 18 has a shape such that the permeated water PW discharged from the permeated water discharge port 9 does not return due to gravity.
  • the casing body 4 is provided with an air vent 34 for communicating the outside of the casing 2 and the permeated water space S3.
  • the air vent 34 is provided in the upper part of the permeated water space S3.
  • each tubular filtration membrane 3 is fixed to the inner peripheral surface of the insertion hole 32 after being inserted into the insertion hole 32 of the first partition wall 30.
  • a space between the inner peripheral surface of the insertion hole 32 and the outer peripheral surface of the tubular filtration membrane 3 is sealed with a sealing material (not shown).
  • a sealing material a material that has an initial viscosity and hardens with time, such as an epoxy resin or a urethane resin, is preferable.
  • the other end of each tubular filtration membrane 3 is fixed to the insertion hole 32 of the second partition wall 31 in the same manner as one end of the tubular filtration membrane 3.
  • the tubular filtration membrane 3 has a cylindrical shape, and is formed of a polymer filtration membrane having a single layer structure in which a hydrophilic monomer is copolymerized on a single main constituent material. That is, the tubular filtration membrane 3 is formed of a single material as a main material. That the main material is formed of one kind of material means that one kind of resin occupies 50% by mass or more in the material (for example, resin) forming the tubular filtration membrane 3. The fact that the main material is formed of one kind of material means that the nature of the one kind of material dominates the nature of the constituent material. Specifically, it means a material in which one kind of resin has 50 mass% to 99 mass%.
  • the main materials constituting the tubular filtration membrane 3 include polyolefin chlorides such as vinyl chloride resin, polysulfone (PS), polyvinylidene fluoride (PVDF), polyethylene (PE), polyacrylonitrile (PAN), and polyether.
  • Polymer materials such as sulfone, polyvinyl alcohol (PVA), and polyimide (PI) can be used.
  • a vinyl chloride resin is particularly preferable.
  • vinyl chloride resins include vinyl chloride homopolymer (vinyl chloride homopolymer), a copolymer of a monomer having an unsaturated bond copolymerizable with vinyl chloride monomer and vinyl chloride monomer, and vinyl chloride monomer in the polymer.
  • vinyl chloride resins include graft copolymers obtained by graft copolymerization, and (co) polymers composed of chlorinated vinyl chloride monomer units.
  • hydrophilic monomers examples include: (1) A cationic group-containing vinyl monomer such as an amino group, an ammonium group, a pyridyl group, an imino group or a betaine structure and / or a salt thereof, (2) Hydrophilic nonionic group-containing vinyl monomers such as hydroxyl groups, amide groups, ester structures, ether structures, (3) Anionic group-containing vinyl monomer such as carboxyl group, sulfonic acid group, phosphoric acid group and / or salt thereof, (4) Other monomers may be mentioned.
  • the tube diameter of the tubular filtration membrane can be appropriately selected depending on the properties of the water to be treated W.
  • the inner diameter of the tubular filtration membrane 3 is 5 mm.
  • the inner diameter of the tubular filtration membrane 3 is 5 mm-10 mm, and when the coarse fiber amount ⁇ is 500 mg / liter or more, the inner diameter of the tubular filtration membrane 3 is Can be 10 mm or more.
  • the water to be treated W1 is treated in the biological treatment water tank 11. Specifically, the organic substance contained in the for-treatment water W1 is decomposed by microorganisms.
  • the water to be treated W2 discharged from the biological treatment water tank 11 is stored in the raw water tank 12.
  • the treated water W3 discharged from the raw water tank 12 is supplied to the membrane separation device 13 via the circulation pump 21, it is sent into the tubular filtration membrane 3 of the membrane module 1.
  • Permeated water PW permeated from the tubular filtration membrane 3 flows into the permeated water space S3.
  • the permeated water PW in the permeated water space S3 flows downward by gravity.
  • the permeated water PW that has flowed downward in the permeated water space S3 is discharged from the permeated water discharge port 9 provided in the lower portion of the permeated water space S3, and is stored in the storage tank 20 via the permeated water pipe 18.
  • Concentrated water W4 discharged from the membrane separation device 13 is returned to the biological treatment water tank 11 through the return pipe 19 for the entire amount excluding excess sludge, and is processed again.
  • the water treatment system 10 is stopped, the entire amount of the permeated water PW in the permeate water space S3 is discharged out of the permeate water space S3. In other words, even when the flow of the water to be treated W3 is stopped by stopping the circulation pump 21, the permeate PW does not stay in the permeate space S3.
  • the permeated water PW is discharged from the permeated water discharge port 9 provided in the lower part. Thereby, the permeated water PW does not stay in the permeated water space S3, and the permeation of the permeated water PW and scale deposition can be suppressed.
  • the tubular filtration membrane 3 is formed of a hydrophilic material, thereby Even when the processing system 10 is stopped, the tubular filtration membrane 3 is not damaged by drying.
  • the air release port 34 is provided in the casing body 4, the air pressure in the permeated water space S ⁇ b> 3 becomes atmospheric pressure, thereby preventing the permeated water PW from being difficult to be discharged from the permeated water discharge port 9. be able to. Further, by providing the air vent 34, the permeate PW in the permeate space S3 can be discharged to the outside of the casing 2 even when the suction pump 22 is stopped.
  • the membrane surface flow rate of the water to be treated W3 can be lowered.
  • the membrane surface flow velocity can be set to, for example, 0.15 m / s-0.30 m / s.
  • the tubular filtration membrane 3 When the tubular filtration membrane 3 is hydrophobic, it is necessary to increase the membrane surface flow velocity (for example, 2.5 m / s). For this reason, the circulation flow rate increases, and it becomes necessary to return the concentrated water W4 discharged from the membrane separation device 13 to the raw water tank 12 and the biological treatment water tank 11.
  • a distribution tank and piping for distributing the concentrated water W4 to the raw water tank 12 and the biological treatment water tank 11 are required.
  • the water treatment system 10 of the present embodiment can reduce the membrane surface flow velocity, the circulation flow rate of the water to be treated W can be reduced. Thereby, the power of the circulation pump 21 can be reduced. Moreover, the distribution tank which distributes the concentrated water W4 to the raw
  • the membrane module 1 in which the tubular filtration membranes 3 are arranged in parallel is adopted as the membrane module 1, but the present invention is not limited to this.
  • a plurality of tubular filtration membranes 3 may be connected in series. That is, a plurality of U-shaped connection members 46 that connect one end of the plurality of tubular filtration membranes 3 and the other end of the tubular filtration membrane 3 so that the plurality of tubular filtration membranes 3 are connected in series. It is good also as a structure to have.
  • the treated water introduction port 7 and the concentrated water discharge port 8 are directly connected to the plurality of tubular filtration membranes 3 connected in series via the connecting member 47 and the connecting member 48, and the treated water W3 is supplied. It may be introduced and the concentrated water W4 may be discharged.
  • the upper header space S2 may be omitted, and the configuration of the casing may be changed, for example, the second side wall 6 may be eliminated.
  • the membrane module 1 of 2nd embodiment of this invention is demonstrated based on drawing. In the present embodiment, differences from the first embodiment described above will be mainly described, and description of similar parts will be omitted.
  • the treated water inlet 7 of the membrane module 1 of the present embodiment is connected to the upper header space S2, and the concentrated water outlet 8 is connected to the lower header space S1.
  • the treated water W flows from the upper side to the lower side.
  • the membrane module 1 of the present invention can be configured such that the water to be treated W3 flows downward as in the above embodiment. In this case, it is desirable to install a siphon breaker.
  • the permeated water is discharged from the permeated water discharge port provided at the lower part.
  • permeated water does not stay in the permeated water space, and the permeated water can be prevented from decaying and scale deposition.
  • the tubular filtration membrane by forming the tubular filtration membrane with a hydrophilic material, it is possible to prevent damage due to drying of the tubular filtration membrane even when the flow of water to be treated stops.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
PCT/JP2016/083676 2015-11-18 2016-11-14 膜モジュール及び水処理システム WO2017086267A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020187013440A KR102066365B1 (ko) 2015-11-18 2016-11-14 막 모듈 및 수처리 시스템
CN201680065824.4A CN108348861B (zh) 2015-11-18 2016-11-14 膜组件以及水处理***

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-225959 2015-11-18
JP2015225959A JP6405596B2 (ja) 2015-11-18 2015-11-18 膜モジュール及び水処理システム

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WO2017086267A1 true WO2017086267A1 (ja) 2017-05-26

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JP (1) JP6405596B2 (ko)
KR (1) KR102066365B1 (ko)
CN (1) CN108348861B (ko)
TW (1) TW201722856A (ko)
WO (1) WO2017086267A1 (ko)

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KR102050260B1 (ko) * 2018-08-07 2019-11-29 한밭대학교 산학협력단 오염수 정화 장치

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JP6405596B2 (ja) 2018-10-17
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CN108348861A (zh) 2018-07-31
JP2017094229A (ja) 2017-06-01
KR102066365B1 (ko) 2020-01-14
TW201722856A (zh) 2017-07-01

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