WO2017168786A1 - 中空糸膜モジュールの洗浄方法及び中空糸膜濾過装置 - Google Patents
中空糸膜モジュールの洗浄方法及び中空糸膜濾過装置 Download PDFInfo
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- WO2017168786A1 WO2017168786A1 PCT/JP2016/076827 JP2016076827W WO2017168786A1 WO 2017168786 A1 WO2017168786 A1 WO 2017168786A1 JP 2016076827 W JP2016076827 W JP 2016076827W WO 2017168786 A1 WO2017168786 A1 WO 2017168786A1
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- Prior art keywords
- hollow fiber
- fiber membrane
- water
- container
- cleaning
- Prior art date
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- 239000012528 membrane Substances 0.000 title claims abstract description 124
- 239000012510 hollow fiber Substances 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005374 membrane filtration Methods 0.000 title claims abstract description 24
- 238000005406 washing Methods 0.000 title abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 206
- 238000004140 cleaning Methods 0.000 claims abstract description 47
- 230000005587 bubbling Effects 0.000 claims abstract description 19
- 239000002351 wastewater Substances 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 238000011001 backwashing Methods 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 15
- 238000007664 blowing Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 abstract 2
- 239000007787 solid Substances 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 238000004382 potting Methods 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 9
- 238000001914 filtration Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000005708 Sodium hypochlorite Substances 0.000 description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
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
- B01D63/02—Hollow fibre modules
- B01D63/024—Hollow fibre modules with a single potted end
- B01D63/0241—Hollow fibre modules with a single potted end being U-shaped
-
- 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
- B01D63/02—Hollow fibre modules
- B01D63/04—Hollow fibre modules comprising multiple hollow fibre assemblies
-
- 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
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/08—Hollow fibre membranes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2313/00—Details relating to membrane modules or apparatus
- B01D2313/26—Specific gas distributors or gas intakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
-
- 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
- B01D2321/16—Use of chemical agents
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Definitions
- the present invention relates to a hollow fiber membrane module cleaning method and a hollow fiber membrane filtration device, and more particularly to a hollow fiber membrane module cleaning method and a hollow fiber membrane filtration device capable of sufficiently washing and removing turbidity adhering to the membrane.
- Hollow fiber membrane modules are widely used in the field of pure water production and wastewater collection as a means for removing turbid components and organic substances.
- membranes of hollow fiber membrane modules microfiltration membranes (MF membranes), ultrafiltration membranes (UF membranes), etc. are properly used depending on the object to be separated, the former being around 0.1 ⁇ m and the latter being 0.005- 0.5 ⁇ m pores are common.
- the membrane will become clogged, and the frequency of backwashing and chemical washing will increase. Get higher.
- a method of reducing the amount of water per unit area of the membrane is common, but this method has a problem that the number of membranes is increased.
- Patent Document 1 proposes a backwashing method using air and water in order to improve the turbidity removability of the membrane.
- this method may not improve the turbidity removability so much, and a higher-performance backwashing method is required.
- JP 2005-88008 A Japanese Patent Laid-Open No. 5-96136 JP 2002-204930 A
- the present invention has been made in view of the above-described conventional circumstances, and provides a method for cleaning a hollow fiber membrane module and a hollow fiber membrane filtration device capable of sufficiently removing turbidity adhering to the hollow fiber membrane uniformly. With the goal.
- the method for cleaning a hollow fiber membrane module of the present invention includes a container having a treated water outlet and a concentrated water outlet, a water conduit for supplying raw water into the container, and a hollow for separating raw water into permeated water and concentrated water.
- a plurality of hollow fiber membranes arranged in a vertical direction in the container, and fixing an upper end portion of the hollow fiber membrane, an upper end fixing portion arranged at an upper portion in the container;
- a permeated water chamber formed inside the hollow fiber membrane and communicating with the inside of each hollow fiber membrane, and the water conduit extends vertically below the upper end fixing portion, and has a side peripheral surface.
- a plurality of ejection holes for ejecting raw water are provided, and a drainage port for discharging cleaning wastewater when performing bubbling cleaning in which gas is blown from the plurality of ejection holes is provided in a lower portion of the container
- the hollow fiber membrane is fixed only at the upper end fixing portion.
- the water conduit extends through the bottom surface of the container.
- the drain outlet is provided around the water conduit.
- backwashing is performed by supplying backwashing water from the treated water outlet simultaneously with the bubbling washing.
- a chemical solution is added to the backwash water.
- the cleaning wastewater before or after discharging the cleaning wastewater from the drain outlet, the cleaning wastewater is discharged from the concentrated water outlet provided in the upper part of the container.
- the gas flow rate through the water conduit is 100 to 300 NL / min.
- the hollow fiber membrane filtration device of the present invention includes a container having a treated water outlet and a concentrated water outlet, a water conduit for supplying raw water into the container, and a hollow fiber membrane for separating raw water into permeated water and concentrated water.
- a plurality of hollow fiber membranes arranged in the vertical direction in the container, and an upper end portion of the hollow fiber membrane is fixed; an upper end fixing portion arranged in an upper part of the container; and the upper end
- a hollow fiber membrane module formed on the upper side of the fixing portion and having a permeate chamber that communicates with the interior of each hollow fiber membrane, and the water conduit extends vertically below the upper end fixing portion.
- a plurality of jet holes for jetting raw water are provided on the side peripheral surface, and a drain port for discharging cleaning waste water when performing bubbling cleaning in which gas is blown from the plurality of jet holes is provided at the lower portion of the container.
- the raw water pipe and gas introduction means are connected to the water conduit A.
- the hollow fiber membrane is fixed only at the upper end fixing portion.
- the water conduit extends through the bottom surface of the container.
- the drain outlet is provided around the water conduit.
- backwashing means for supplying backwash water from the treated water outlet is provided.
- the water conduit extends in the vertical direction in the container, and the bubbling cleaning is performed by blowing gas from a plurality of ejection holes provided in the water conduit. Air reaches the entire module, and turbidity adhering to the hollow fiber membrane can be removed thoroughly and uniformly.
- FIG. 1 is a schematic view showing a configuration of a hollow fiber membrane filtration device provided with a hollow fiber membrane module according to the present embodiment.
- the hollow fiber membrane module includes a container 1 that is arranged with the axial direction of the cylinder in the vertical direction (vertical direction in this embodiment).
- a plurality of hollow fiber membranes 2 are disposed in the container 1.
- the hollow fiber membrane 2 is fixed on the upper side of the container 1 by a synthetic resin potting portion 3 as a fixing portion, and is not fixed on the lower side of the container 1.
- a synthetic resin for the potting portion 3 for example, an epoxy resin can be used.
- the hollow fiber membrane 2 is incorporated into a U-shape, and both ends of the hollow fiber membrane are fixed by the potting portion 3.
- the middle part of the hollow fiber membrane 2 is located in the lower part of the container 1.
- the hollow fiber membrane 2 having one end opened and the other end sealed When the hollow fiber membrane 2 having one end opened and the other end sealed is used, one end side of the opened hollow fiber membrane 2 is fixed by the potting portion 3 and the other end side sealed is the container 1. Place at the bottom of.
- the hollow fiber membrane 2 may be either a UF membrane or an MF membrane.
- the hollow fiber membrane 2 is not particularly limited, but usually, one having an inner diameter of 0.2 to 1.0 mm, an outer diameter of 0.5 to 2.0 mm, and an effective length of about 300 to 2500 mm is used.
- a suitable membrane having a total membrane area of 5 to 100 m 2 in which 500 to 70,000 hollow fiber membranes 2 are loaded in the container 1 is suitable.
- the membrane material of the hollow fiber membrane 2 is not particularly limited, but PVDF (polyvinylidene fluoride), polyethylene, polypropylene, or the like can be used.
- PVDF polyvinylidene fluoride
- a treated water chamber 7 is defined on the upper side of the potting portion 3.
- the upper end side of the hollow fiber membrane 2 penetrates the potting portion 3, the opening at the upper end faces the treated water chamber 7, and the inside of the hollow fiber membrane 2 communicates with the treated water chamber 7.
- both ends of the hollow fiber membrane 2 penetrate the potting portion 3.
- the potting portion 3 has, for example, a disk shape, and its outer peripheral surface or outer peripheral edge portion is in watertight contact with the inner surface of the container 1.
- a water conduit 4 extends in a substantially vertical direction (the axial direction of the container 1).
- the water conduit 4 is disposed along the central axis of the container 1, for example.
- the water guide pipe 4 is a circular pipe whose tip (upper end) is closed, and a plurality of jet holes 4a are provided on the side peripheral surface in the vertical direction and at intervals in the circumferential direction.
- the number of the ejection holes 4a is not particularly limited, but is about 5 to 50, for example.
- the height (length in the vertical direction) of the water conduit 4 is not particularly limited, it is preferable that the upper end of the water conduit 4 is located near the lower surface of the potting portion 3.
- the size and shape of the ejection hole 4a are not particularly limited, but are, for example, circular with a diameter of 5 to 50 mm.
- the inner diameter of the water conduit 4 is, for example, about 10 to 100 mm. Further, the upper end of the water conduit may be embedded in the potting portion 3.
- the lower part of the water conduit 4 extends through the bottom surface of the container 1 and extends to the outside of the container 1.
- a raw water pipe L1 is connected to the water conduit 4, and a pump P1 and a valve V1 are provided in the raw water pipe L1.
- An air introduction pipe L2 branches from the raw water pipe L1, and a valve V2 is provided in the air introduction pipe L2.
- the supply of raw water / air to the container 1 can be switched by switching between opening and closing of the valve V1 and the valve V2.
- the valve V1 is opened, the valve V2 is closed, and the raw water is sent out through the raw water pipe L1 by the pump P1 so that the raw water is ejected in the radial direction from the ejection hole 4a of the water conduit 4, and the raw water is supplied into the container 1. be able to.
- valve V1 When the valve V1 is closed and the valve V2 is opened and air is supplied from the air introduction pipe L2, bubbles are ejected in the radial direction from the ejection holes 4a of the water conduit 4, and bubbling cleaning can be performed. It is also possible to open the valves V1 and V2 and eject the gas-liquid mixed flow from the ejection hole 4a.
- the outlet 5 of the treated water is provided at the top of the container 1.
- a concentrated water outlet 8 is provided at the upper part of the side surface of the container 1.
- the concentrated water outlet 8 is provided near the lower surface of the potting portion 3.
- the distance from the potting part 3 to the upper edge of the concentrated water outlet 8 is preferably 0 to 30 mm, particularly preferably about 0 to 10 mm.
- a pipe L5 is connected to the concentrated water outlet 8, and a valve V5 is provided in the pipe L5.
- the drain port 6 is provided in the lower part of the side surface of the container 1.
- the drain port 6 is provided near the bottom surface of the container 1.
- a pipe L6 is connected to the drain port 6, and a valve V6 is provided in the pipe L6.
- a treated water outlet pipe L3 is connected to the treated water outlet 5, and treated water (membrane permeated water) is discharged through the treated water outlet pipe L3.
- the treated water is stored in the treated water tank 9.
- the backwash water pipe L4 is connected to the treated water outlet pipe L3 at a position between the valve V3 provided in the treated water outlet pipe L3 and the treated water outlet 5.
- the backwash water pipe L4 is provided with a valve V4, the valve V3 is closed, the valve V4 is opened, and the backwash water is caused to flow from the treated water outlet 5 to the container 1 through the backwash water pipe L4 by the pump P2.
- the back washing of the hollow fiber membrane 2 can be performed.
- FIG. 1 shows a configuration in which the backwash water pipe L4 is connected to the treated water tank 9 and the treated water is used as the backwash water
- the backwash water may be raw water.
- Waste water accompanying the cleaning may be discharged from the drain port 6 through the pipe L6, or may be discharged from the concentrated water outlet 8 through the pipe L5.
- the discharge from the drain port 6 and the discharge from the concentrated water outlet 8 may be performed sequentially (alternately).
- Chemical solution addition means for adding a chemical solution to the backwash water flowing through the backwash water pipe L4 may be provided.
- the chemical solution to be added is sodium hypochlorite, a strong alkaline agent, a strong acid agent or the like, and is selected according to the film deposit.
- sodium hypochlorite is preferably added so that 0.05 to 0.3 mg Cl 2 / L remains.
- the valves V1, V3, V5 are opened, the valves V2, V4, V6 are closed, the pump P1 is operated, and raw water is supplied from the water conduit 4. To do. Of the raw water supplied from the water conduit 4, the permeated water that has permeated through the hollow fiber membrane 2 is taken out from the treated water outlet 5 as treated water and stored in the treated water tank 9 via the treated water extraction pipe L 3.
- the concentrated water that has not permeated through the hollow fiber membrane 2 is discharged from the concentrated water outlet 8 through the pipe L5. You may circulate so that the discharged
- the hollow fiber membrane filtration device shown in FIG. 1 performs filtration with an external pressure method in which raw water is passed through the outside of the hollow fiber membrane 2 by a cross flow method.
- the valves V1, V3, V6 are closed, the valves V2, V4, V5 are opened, air is blown into the container 1 from the water conduit 4, and bubbling is performed.
- the pump P2 is operated, backwash water is sent into the hollow fiber membrane 2 through the treated water chamber 7, and backwashing is performed.
- the amount of air supplied from the water conduit 4 is preferably about 30 to 500 NL / min, and more preferably 100 to 300 NL / min.
- a chemical solution may be added to the backwash water.
- the washing waste water is discharged out of the system from the concentrated water outlet 8 through the pipe L5. In this cleaning process, bubbling cleaning and reverse cleaning are performed simultaneously.
- valve V6 may be opened and the valve V5 may be closed during the cleaning process. In this case, the cleaning waste water is discharged from the drain port 6.
- the flow in which the air ejected from the water conduit 4 is discharged from the drain port 6 together with the backwash water is indicated by arrows.
- valve V6 After discharging the backwash water from the drain port 6 shown in FIG. 4 for a predetermined time, as shown in FIG. 3, the valve V6 is closed and the valve V5 is opened to discharge the backwash water from the concentrated water outlet 8. You may do it.
- the water guide pipe 4 is provided with a large number of ejection holes 4a in the entire vertical direction, air bubbles are jetted to the entire hollow fiber membrane 2 including the vicinity of the upper end fixing portion (near the potting portion 3) of the hollow fiber membrane 2.
- the turbidity can be thoroughly washed and removed evenly. Even if the amount of air during bubbling washing is increased, the hollow fiber membrane 2 can be prevented from being twisted or broken as compared with a method in which air is passed from the lower part of the module to the upper part.
- the turbidity peeled off from the hollow fiber membrane 2 can be efficiently discharged by sequentially discharging the backwash water from the drain port 6 and the backwash water from the concentrated water outlet 8.
- the drain port 6 may be provided at the bottom of the container 1.
- the periphery of the water conduit 4 is a drain port 6.
- the upper and lower ends of the hollow fiber membrane 2 may be fixed.
- the lower end of the hollow fiber membrane 2 is embedded and sealed in the potting portion 3A.
- a through hole through which the water conduit 4 passes is provided at the center of the potting portion 3A.
- the back washing may be air back washing instead of water back washing.
- a gas-liquid mixed flow may be supplied from the water conduit 4 instead of air.
- Example 1 The raw fiber was passed through the water conduit 4 for 30 minutes through the hollow fiber membrane filtration apparatus provided with the hollow fiber membrane module shown in FIG. Tap water was stored in the raw water tank and bentonite was added at 10 mg / L and sodium humate was added at 5 mg / L, and then the pH was adjusted to 8.0 with sodium hydrogen carbonate from Kishida Chemical and sulfuric acid from Kishida Chemical. Water was fed from the raw water tank to the coagulation tank by a pump, and the residence time was 10 minutes. What added 100 mg / L of industrial ferric chloride (concentration 38%) before the coagulation tank was used as raw water.
- the configuration of the hollow fiber membrane module is as follows.
- Container 1 Inner diameter 200mm, Height 1300mm
- Hollow fiber UF membrane made of polyvinylidene fluoride having an inner diameter of 0.75 mm, an outer diameter of 1.25 mm, and an effective length of 990 mm, membrane area of 30 m 2
- Water guide pipe 4 Length extending into the container 1 1000 mm, inner diameter 20 mm, outer diameter 25 mm
- Ejection hole 4a Diameter 10mm, 10 pieces
- Example 2 The same treatment as in Example 1 was performed except that the backwash water was discharged from the drain port 6. The measurement results are shown in Table 1.
- Example 3 After the backwash water was discharged from the drain outlet 6, the same treatment as in Example 1 was performed except that the backwash water was discharged from the concentrated water outlet 8. The measurement results are shown in Table 1.
- Example 4 The same processing as in Example 3 was performed except that the supply amount of bubbling air was 150 NL / min. The measurement results are shown in Table 1.
- Example 5 The same treatment as in Example 4 was performed, except that sodium hypochlorite was added to the backwash water so as to be 300 mgCl 2 / L. The measurement results are shown in Table 1.
- Example 1 The same treatment as in Example 1 was performed except that a hollow fiber membrane module in which the water conduit 4 was not provided was used and bagling washing was omitted. The measurement results are shown in Table 1.
- Comparative Example 2 The same treatment as in Comparative Example 1 was performed except that bubbling air was supplied at 80 NL / min from the bottom of the container of the hollow fiber membrane module during backwashing. The measurement results are shown in Table 1.
- Comparative Example 3 The same treatment as in Comparative Example 2 was performed except that the lower end of the hollow fiber membrane was embedded and fixed in the potting part. The measurement results are shown in Table 1.
- Example 1 the turbidity removal rate was higher than in Comparative Example 1 in which the water conduit 4 was not installed.
- Example 1 The turbidity removal rate was higher in Example 1 in which air was introduced from the water conduit 4 than in the case where air was introduced from the lower part of the container of the hollow fiber membrane module as in Comparative Example 2.
- Example 2 in which backwash water was discharged from the drain outlet 6 at the bottom of the container 1 was higher in turbidity removal than Example 1 in which backwash water was discharged from the concentrated water outlet 8 at the top of the container 1.
- Example 3 in which discharge of the backwash water from the drain outlet 6 and discharge of the backwash water from the concentrated water outlet 8 were carried out in order had higher turbidity removal performance than Examples 1 and 2.
- Comparative Example 2 in which only the upper end was fixed showed higher turbidity removal than Comparative Example 3 in which the upper and lower ends of the hollow fiber membrane were fixed.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
図1に示す中空糸膜モジュールを備えた中空糸膜濾過装置に、導水管4を介して原水を30分間通水して濾過処理を行った。原水槽に水道水を貯水してベントナイトを10mg/L、フミン酸ナトリウムを5mg/L添加した後に、キシダ化学製炭酸水素ナトリウム、キシダ化学製硫酸によりpHを8.0に調製した。原水槽からポンプで凝集槽に送水し、滞留時間を10分とした。凝集槽前に工業用塩化第二鉄(濃度38%)を100mg/L添加したものを原水として使用した。中空糸膜モジュールの構成は次の通りである。
容器1:内径200mm、高さ1300mm
中空糸:内径0.75mm、外径1.25mm、有効長さ990mmのポリフッ化ビニルデン製UF膜、膜面積30m2
導水管4:容器1内に延在する長さ1000mm、内径20mm、外径25mm
噴出孔4a:口径10mm、10個
逆洗水を排水口6から排出したこと以外は実施例1と同様の処理を行った。測定結果を表1に示す。
逆洗水を排水口6から排出した後、濃縮水出口8から排出したこと以外は実施例1と同様の処理を行った。測定結果を表1に示す。
バブリング用空気の供給量を150NL/minとしたこと以外は実施例3と同様の処理を行った。測定結果を表1に示す。
逆洗水に次亜塩素酸ナトリウムを300mgCl2/Lとなるように添加したこと以外は実施例4と同様の処理を行った。測定結果を表1に示す。
導水管4が設けられていない中空糸膜モジュールを使用し、バグリング洗浄を省略したこと以外は実施例1と同様の処理を行った。測定結果を表1に示す。
逆洗浄の際に中空糸膜モジュールの容器下部からバブリング用空気を80NL/min供給したこと以外は比較例1と同様の処理を行った。測定結果を表1に示す。
中空糸膜の下端をポッティング部に埋設して固定したこと以外は比較例2と同様の処理を行った。測定結果を表1に示す。
本出願は、2016年3月29日付で出願された日本特許出願2016-066000に基づいており、その全体が引用により援用される。
2 中空糸膜
3 ポッティング部
4 導水管
5 処理水出口
6 排水口
7 処理水室
8 濃縮水出口
9 処理水タンク
Claims (14)
- 処理水出口及び濃縮水出口を有する容器と、
該容器内に原水を供給する導水管と、
原水を透過水と濃縮水とに分離するための中空糸膜であって、該容器内に上下方向に配置された複数の中空糸膜と、
該中空糸膜の上端部を固定しており、該容器内の上部に配置された上端固定部と、
該上端固定部の上側に形成され、各中空糸膜の内部が連通した透過水室と、
を備え、
前記導水管は、前記上端固定部の下側に上下方向に延在し、側周面に原水を噴出する複数の噴出孔が設けられており、
前記容器の下部には、前記複数の噴出孔から気体を吹き込むバブリング洗浄を行う際の洗浄排水を排出する排水口が設けられている中空糸膜モジュールの洗浄方法であって、
前記複数の噴出孔から気体を吹き込むバブリング洗浄を行い、洗浄排水を前記排水口から排出することを特徴とする中空糸膜モジュールの洗浄方法。 - 請求項1において、前記上端固定部でのみ前記中空糸膜が固定されていることを特徴とする中空糸膜モジュールの洗浄方法。
- 請求項1又は2において、前記導水管は前記容器の底面を貫通して前記容器内に延設されていることを特徴とする中空糸膜モジュールの洗浄方法。
- 請求項3において、前記排水口は前記導水管の周囲に設けられていることを特徴とする中空糸膜モジュールの洗浄方法。
- 請求項1乃至4のいずれかにおいて、前記バブリング洗浄と同時に、前記処理水出口から逆洗水を供給する逆洗浄を行うことを特徴とする中空糸膜モジュールの洗浄方法。
- 請求項5において、前記逆洗水に薬液を添加することを特徴とする中空糸膜モジュールの洗浄方法。
- 請求項1乃至6のいずれかにおいて、前記排水口から洗浄排水を排出する前又は後に、前記容器の上部に設けられた前記濃縮水出口から洗浄排水を排出することを特徴とする中空糸膜モジュールの洗浄方法。
- 請求項1乃至7のいずれかにおいて、前記導水管を通る気体の流量が100~300NL/minであることを特徴とする中空糸膜モジュールの洗浄方法。
- 処理水出口及び濃縮水出口を有する容器と、
該容器内に原水を供給する導水管と、
原水を透過水と濃縮水とに分離するための中空糸膜であって、該容器内に上下方向に配置された複数の中空糸膜と、
該中空糸膜の上端部を固定しており、該容器内の上部に配置された上端固定部と、
該上端固定部の上側に形成され、各中空糸膜の内部が連通した透過水室と、
を有する中空糸膜モジュールを備え、
前記導水管は、前記上端固定部の下側に上下方向に延在し、側周面に原水を噴出する複数の噴出孔が設けられており、
前記容器の下部には、前記複数の噴出孔から気体を吹き込むバブリング洗浄を行う際の洗浄排水を排出する排水口が設けられており、
前記導水管に原水配管及び気体導入手段が接続されていることを特徴とする中空糸膜濾過装置。 - 請求項9において、前記上端固定部でのみ前記中空糸膜が固定されていることを特徴とする中空糸膜濾過装置。
- 請求項9又は10において、前記導水管は前記容器の底面を貫通して前記容器内に延設されていることを特徴とする中空糸膜濾過装置。
- 請求項11において、前記排水口は前記導水管の周囲に設けられていることを特徴とする中空糸膜濾過装置。
- 請求項9乃至12のいずれかにおいて、前記処理水出口から逆洗水を供給する逆洗手段を備えることを特徴とする中空糸膜濾過装置。
- 請求項13において、前記逆洗水に薬液を添加する手段を有することを特徴とする中空糸膜濾過装置。
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