JPH10328538A - Method for cleaning hollow yarn membrane filtration tower - Google Patents

Method for cleaning hollow yarn membrane filtration tower

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Publication number
JPH10328538A
JPH10328538A JP15593397A JP15593397A JPH10328538A JP H10328538 A JPH10328538 A JP H10328538A JP 15593397 A JP15593397 A JP 15593397A JP 15593397 A JP15593397 A JP 15593397A JP H10328538 A JPH10328538 A JP H10328538A
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JP
Japan
Prior art keywords
hollow fiber
fiber membrane
cleaning
membrane filter
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP15593397A
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Japanese (ja)
Inventor
Toshio Morita
Satoru Tsuda
利夫 森田
悟 津田
Original Assignee
Japan Organo Co Ltd
オルガノ株式会社
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Publication date
Application filed by Japan Organo Co Ltd, オルガノ株式会社 filed Critical Japan Organo Co Ltd
Priority to JP15593397A priority Critical patent/JPH10328538A/en
Publication of JPH10328538A publication Critical patent/JPH10328538A/en
Application status is Pending legal-status Critical

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Abstract

PROBLEM TO BE SOLVED: To sufficiently clean a hollow yarn membrane filter to prolong the service life of the hollow yarn membrane filter.
SOLUTION: At the time of cleaning the hollow yarn membrane filter 51 in the hollow yarn membrane filtration tower provided with a parting plate 4, which divides the inside of a tower main body 1 into a lower section 2 and an upper section 3, and a hollow yarn membrane module 5, upper end of which is fixed to the parting plate 4 and which vertically hangs in the tower main body 1, and formed so as to filter raw water flowing-in to the lower section 2 with many numbers of the hollow yarn membrane filters 51 in the hollow yarn membrane module 5 and to make the filtrate to flow-out to the upper section 3, the cleaning method of the hollow yarn membrane filtration tower is performed by supplying a liquid chemical for cleaning to the upper section 3, making the liquid chemical for cleaning to flow in to the lower section 2 through the hollow yarn membrane filter 51 and filling the inside of the lower section 2 with the liquid chemical for cleaning.
COPYRIGHT: (C)1998,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、中空糸膜濾過塔の洗浄方法に関し、更に詳しくは、例えば原子力発電所、 The present invention relates to relates to a method for cleaning the hollow fiber membrane filtration column, and more particularly, for example, nuclear power plants,
火力発電所の水処理や一般産業用の排水処理等に好適に用いられる中空糸膜濾過塔の洗浄方法に関する。 It relates to a cleaning method of a hollow fiber membrane filtration column suitably used for waste water treatment or the like for water treatment and general industrial thermal power plants.

【0002】 [0002]

【従来の技術】中空糸膜濾過塔(以下、単に「濾過塔」 BACKGROUND OF THE INVENTION hollow fiber membrane filtration column (hereinafter simply referred to as "filtration tower"
と称す。 Referred to as. )として例えば片端集水型を例に挙げて説明する。 ) And to for example one end catchment type will be described as an example. この中空糸膜濾過塔は、例えば、塔本体と、この塔本体内を一次室である下室と二次室である上室を区画する仕切板と、この仕切板から下室へ垂下する複数本の中空糸膜モジュールとを備えている。 Multiple hollow fiber membrane filtration column, e.g., a column body, hanging down the tower body and the partition plate for partitioning the upper chamber is a lower chamber and the secondary chamber is a primary chamber, the lower chamber from the partition plate and a hollow fiber membrane module of the present. 中空糸膜モジュールは多数本の中空糸膜フィルタを有し、各中空糸膜フィルタの上端が塔本体内の上室で開口している。 The hollow fiber membrane module has a hollow fiber membrane filter of large number, the upper end of each hollow fiber membrane filter is open at the upper chamber of the column body. 従って、原水の処理時には、下室内に流入した原水は中空糸膜モジュール内で各中空糸膜フィルタの外側(一次側)から内側(二次側)へ透過し、原水が各中空糸膜フィルタを透過する間に原水中の酸化鉄等の無機物や不溶性の有機物等の懸濁物質が中空糸膜フィルタの外面で捕捉され、濾過水が中空糸膜フィルタの内側を経由して上室へ流出するようになっている。 Therefore, when processing of the raw water is transmitted from the outside of the hollow fiber membrane filter raw water that has flowed down chamber in the hollow fiber membrane module (primary side) to the inside (secondary side), raw water to the hollow fiber membrane filter suspended solids such as organic substances inorganic and insoluble, such as iron oxide in the raw water during the transmission are captured by the outer surface of the hollow fiber membrane filter, and flows into the upper chamber filtrated water through the inside of the hollow fiber membrane filter It has become way.

【0003】そして、所定期間濾過を継続すると、中空糸膜フィルタの外面に懸濁物質が圧密状態になって堆積し、堆積物を原水が透過する際の抵抗が高くなり、下室と上室間の差圧が次第に上昇し、濾過機能が次第に低下する。 [0003] Then, when continued for a predetermined period filtration, suspended matter on the outer surface of the hollow fiber membrane filter is deposited becomes compacted state, deposits the resistance when the raw water passes is increased, the lower chamber and the upper chamber differential pressure between gradually increases, filtration function gradually decreases. そのため、濾過塔を洗浄し、中空糸膜フィルタの機能回復を行う。 Therefore, washing the filtration tower, perform functional recovery of the hollow fiber membrane filter. 濾過塔を洗浄する際には、例えば下室内を満水にした状態で各中空糸膜モジュール内へ空気を流入させ、空気が中空糸膜モジュール内をバブリングすると、各中空糸膜フィルタが振動し、懸濁物質が各中空糸膜フィルタから剥離し、各中空糸膜フィルタの洗浄が行われる。 When cleaning the filtration tower, for example, air is the inflow while the full level of the lower chamber to the hollow fiber membrane module, when air is bubbled through the hollow fiber membrane module, the hollow fiber membrane filter is vibrated, suspended solids is separated from the hollow fiber membrane filter, washing the hollow fiber membrane filter is carried out.

【0004】しかし、各中空糸膜フィルタに多量の懸濁物質が圧密状態で堆積して各中空糸膜フィルタ間の隙間が懸濁物質で詰まり、あるいは粘着性の懸濁物質が堆積すると、単に中空糸膜モジュール内で空気をバブリングするだけでは中空糸膜フィルタから懸濁物質を殆ど剥離することができないことがある。 However, a large amount of suspended solids in the hollow fiber membrane filter is clogged in a gap is suspended solids between deposited in compacted state the hollow fiber membrane filter, or a sticky suspended solids are deposited, simply only bubbling air in the hollow fiber membrane module may not be able to almost peeled suspended solids from the hollow fiber membrane filter. この場合には洗浄効果の高い洗浄用薬液を下室内に満たした後、上述した場合と同様に洗浄用薬液中に空気をバブリングし、更に中空糸膜モジュールを洗浄用薬液中に所定時間浸漬する。 After filling the high cleaning effect cleaning solution under room in this case, the air bubbled through the cleaning liquid chemical in the same manner as described above, is immersed predetermined time further cleaning liquid chemical hollow fiber membrane module . 更に、その後、洗浄用薬液中に空気をバブリングして中空糸膜フィルタから懸濁物質を除去するようにしている。 Furthermore, thereafter, by bubbling air followed by removal of suspended solids from the hollow fiber membrane filter in the cleaning solution.

【0005】 [0005]

【発明が解決しようとする課題】しかしながら、中空糸膜フィルタに多量の懸濁物質が圧密状態で堆積すると、 [SUMMARY OF THE INVENTION However, a large amount of suspended solids in the hollow fiber membrane filter is deposited in compacted state,
各中空糸膜フィルタ間の隙間が極めて狭くなり、場合によっては各中空糸膜フィルタ間の隙間が懸濁物質で詰まり、中空糸膜フィルタが束状の固まりとなってしまうことがある。 Gaps between the hollow fiber membrane filter is very narrow, sometimes clogged with clearance suspended solids between the hollow fiber membranes filter, there is the hollow fiber membrane filter becomes a bundle of mass. この状態になると、下室内に洗浄用薬液を満たしても中空糸膜フィルタの束の内側へ洗浄用薬液が殆ど浸透せず、洗浄用薬液が懸濁物質と十分に接触することができず、極端な場合には中空糸膜フィルタの束の外周面で接触するだけで、洗浄用薬液の洗浄効果を殆ど期待できなくなり、このような状態下で洗浄用薬液中に空気をバブリングさせたとしても殆どの気泡は中空糸膜フィルタの束の外周面に沿って逃げてしまい、空気のバブリング効果を殆ど期待することができず、各中空糸膜フィルタを十分に洗浄することができないため、中空糸膜の使用限界差圧までの到達時間が短くなり、逆洗の回数が増加するという課題があった。 In this state, without cleaning solution almost penetrate into the interior of the bundle of hollow fiber membrane filter also meet the cleaning solution below room, cleaning solution can not be sufficiently contacted with suspended solids, in an extreme case only contact the outer peripheral surface of the bundle of the hollow fiber membrane filter, can no longer be hardly expected the cleaning effect of the cleaning solution, even if bubbling air cleaning chemical solution under such conditions since most bubbles escapes along the outer peripheral surface of the bundle of the hollow fiber membrane filter, can not be expected bubbling effect of air almost can not be sufficiently cleaned each hollow fiber membrane filter, hollow fiber time to reach use limit pressure difference of film is shortened, there is a problem that the number of backwashing is increased. ひいては中空糸膜フィルタの寿命を低下させるという課題があった。 Hence there is a problem of reducing the life of the hollow fiber membrane filter.

【0006】本発明は、上記課題を解決するためになされたもので、洗浄用薬液による洗浄効果を高めて中空糸膜フィルタを効率良く洗浄することができ、ひいては中空糸膜フィルタの差圧上昇を防止してその寿命を延ばすことができる中空糸膜濾過塔の洗浄方法を提供することを目的としている。 [0006] The present invention has been made to solve the above problems, to enhance the cleaning effect of the cleaning solution can a hollow fiber membrane filter efficiently cleaned, thus the differential pressure increase of the hollow fiber membrane filter and its object is to provide a method for cleaning the hollow fiber membrane filtration column which can extend its life by preventing.

【0007】 [0007]

【課題を解決するための手段】本発明の請求項1に記載の中空糸膜濾過塔の洗浄方法は、塔本体内を一次室と二次室に区画する仕切部材と、この仕切部材に端部が固定され且つ上記塔本体の軸心に沿って上記一次室内に配設された中空糸膜モジュールとを備え、上記一次室に流入した原水を上記中空糸膜モジュール内の多数本の中空糸膜フィルタによって濾過し、この濾過水を上記二次室へ流出させる中空糸膜濾過塔において、上記中空糸膜フィルタを洗浄する際に、上記二次室へ洗浄用薬液を供給し、この洗浄用薬液を上記中空糸膜フィルタを介して上記一次室へ流入させることを特徴とするものである。 Method for cleaning hollow fiber membrane filtration column according to claim 1 of the present invention, in order to solve the problems] includes a partitioning member for partitioning the interior of the column body in the primary chamber and the secondary chamber, the end to the partitioning member part comprising a has a hollow fiber membrane module disposed in the primary chamber above along the axis of the fixed and the tower body, many present hollow fibers in the hollow fiber membrane module raw water flowing into the primary chamber filtered by a membrane filter, the filtrate in the hollow fiber membrane filtration tower to flow out into the secondary chamber, when washing the hollow fiber membrane filter, to supply the cleaning solution into the secondary chamber, for this cleaning the chemical through the hollow fiber membrane filter is characterized in that to flow into the primary chamber above.

【0008】また、本発明の請求項2に記載の中空糸膜濾過塔の洗浄方法は、塔本体内を一次室と二次室に区画する仕切部材と、この仕切部材に端部が固定され且つ上記塔本体の軸心に沿って上記一次室内に配設された中空糸膜モジュールとを備え、上記一次室に流入した原水を上記中空糸膜モジュール内の多数本の中空糸膜フィルタを介して濾過し、この濾過水を上記二次室へ流出させる中空糸膜濾過塔において、上記中空糸膜フィルタを洗浄する際に、上記一次室へ洗浄用薬液を供給しながら上記一次室へ空気を供給し、上記一次室内を上記洗浄用薬液で満たすことを特徴とするものである。 [0008] The method of washing a hollow fiber membrane filtration column according to claim 2 of the present invention, a partition member for partitioning the interior of the column body in the primary chamber and the secondary chamber, the end portion is fixed to the partition member and a hollow fiber membrane module along the axis disposed in the primary chamber above said tower body, the raw water that has flowed into the primary chamber above via a number of hollow fiber membranes filter in the hollow fiber membrane module filtered Te, the filtrate in the hollow fiber membrane filtration tower to flow out into the secondary chamber, when washing the hollow fiber membrane filter, the air into the primary chamber while supplying a cleaning solution into the primary chamber supplied, the primary chamber is characterized in satisfying the above cleaning solution.

【0009】 [0009]

【発明の実施の形態】以下、図1〜図5に示す実施形態に基づいて本発明を説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the embodiment shown in FIGS. 尚、各図中、図1は本発明の洗浄方法の一実施形態に用いられる中空糸膜濾過塔の構成を示す断面図、図2は図1に示す中空糸膜濾過塔に用いられる中空糸膜モジュールの構成を示す断面図、 In the drawings, FIG. 1 is a sectional view showing the configuration of a hollow fiber membrane filtration column used in one embodiment of the cleaning method of the present invention, the hollow fiber 2 is used in the hollow fiber membrane filtration tower shown in FIG. 1 sectional view showing a structure of a membrane module,
図3は本発明の濾過塔の他の実施形態に用いられる両端集水型中空糸膜モジュールを示す断面図、図4は本発明の洗浄方法の一実施形態による洗浄作用を説明するための模式図で、(a)は洗浄処理直前の状態を拡大して示す中空糸膜フィルタの断面図、(b)は洗浄により懸濁物質が剥離する状態を示す中空糸膜フィルタの断面図、 Figure 3 is a sectional view showing both ends catchment type hollow fiber membrane module used in another embodiment of the filtration tower of the present invention, FIG. 4 is a schematic for explaining the cleaning action according to an embodiment of the cleaning method of the present invention Figure with, (a) shows the cross sectional view of a hollow fiber membrane filter showing an enlarged state of the cleaning process immediately before, (b) is a sectional view of a hollow fiber membrane filter showing a state in which the suspended matter by washing is peeled,
図5は本発明の洗浄方法の他の実施形態による洗浄作用を説明するための模式図で、(a)は洗浄中の中空糸膜モジュールを示す断面図、(b)は(a)に示す中空糸膜モジュールの中空糸膜フィルタを拡大して示す断面図である。 Figure 5 is a schematic diagram for explaining the cleaning action according to another embodiment of the cleaning method of the present invention, (a) is a sectional view showing a hollow fiber membrane module in cleaning, shown in (b) is (a) it is an enlarged cross-sectional view showing a hollow fiber membrane filter of the hollow fiber membrane module.

【0010】まず、本発明の濾過塔の洗浄方法に好適に用いられる中空糸膜濾過塔(以下、単に「濾過塔」と称す。)、例えば片端集水型中空糸膜濾過塔について図1、図2を参照しながら説明する。 Firstly, filtration tower suitably hollow fiber membrane filtration column used in the cleaning method of the present invention (hereinafter, simply referred to as "filtration tower".), For example, FIG. 1 for one end catchment type hollow fiber membrane filtration column, Referring to Figure 2 will be described. この濾過塔は、図1 This filtration tower, as shown in FIG. 1
に示すように、塔本体1と、この塔本体1の上部において下室2と上室3に区画する仕切板4と、この仕切板4 As shown in a column body 1, the partition plate 4 for partitioning the lower chamber 2 and the upper chamber 3 in the upper portion of the column body 1, the partition plate 4
から下室2へ垂下する後述の中空糸膜モジュール5とを備えている。 And a hollow fiber membrane module 5 described later drooping into the lower chamber 2 from. また、下室2の底部には原水が流入する流入管6が接続され、上室3の頂部には濾過水が流出する流出管7が接続され、各配管6、7にはバルブ6A、7 Further, the bottom of the lower chamber 2 is connected inlet pipe 6 which raw water flows, the top of the upper chamber 3 is connected outlet pipe 7 which filtered water flows out, each pipe 6,7 valves 6A, 7
Aがそれぞれ取り付けられている。 A is attached to each. そして、下室2は原水が流入する一次室として形成され、上室3は濾過水が流出する二次室として形成されている。 Then, the lower chamber 2 is formed as a primary chamber which raw water flows, the upper chamber 3 is formed as a secondary chamber which filtered water flows out. また、各中空糸膜モジュール5は仕切板4に対して例えばハニカム形状等の所定の幾何学模様を形成して配置されている。 Further, the hollow fiber membrane module 5 is disposed to form a predetermined geometric pattern of honeycomb shape, etc., for example with respect to the partition plate 4.

【0011】上記下室2内の底部中央にはバッフルプレート8が原水の流入口に対向させて配設され、このバッフルプレート8によって下室2内へ流入した原水を分散させるようにしてある。 [0011] The center of the bottom of the said lower chamber 2 is disposed to face the inlet of the baffle plate 8 is raw water, are so as to disperse the raw water that has flowed into the lower chamber 2 by the baffle plate 8. また、このバッフルプレート8 In addition, the baffle plate 8
と中空糸膜モジュール5下端との間には分配機構9が配設され、この分配機構9によってバッフルプレート8からの原水を一旦受け、引き続き各中空糸膜モジュール5 And between the hollow fiber membrane module 5 lower distribution mechanism 9 is arranged, once receiving the raw water from the baffle plate 8 by the distribution mechanism 9, subsequently the hollow fiber membrane module 5
へ分配するようにしてある。 It is to be distributed to. 即ち、分配機構9は、全体が偏平なカップ状で下室2の内径より縮小した外径を有する大きさに形成されている。 That is, the distribution mechanism 9 is formed in a size that the whole has an outer diameter reduced from the inner diameter of the lower chamber 2 in a flat cup-shaped. そして、分配機構9には各中空糸膜モジュール5に対向させた分配管10がそれぞれ配設され、各分配管10及び分配機構9の周囲から各中空糸膜モジュール5側へ原水を分配供給するようにしてある。 Then, the distribution mechanism 9 distribution pipe 10 that is opposed to the hollow fiber membrane module 5 is disposed respectively, distributing supplies raw water from the periphery of each dispensing tube 10 and dispensing mechanism 9 to the hollow fiber membrane module 5 side It is so.

【0012】また、塔本体1には中空糸膜モジュール5 [0012] In addition, the tower body 1 hollow fiber membrane module 5
を構成する中空糸膜フィルタに付着した懸濁物質を洗浄する際に用いる空気配管が接続されている。 Air pipe to be used for cleaning are connected to suspended matter adhering to the hollow fiber membrane filter constituting the. この空気配管は、上室3の頂部に接続された空気配管11と、下室2の下部に接続された空気配管12と、下室2の上部に接続された空気配管13とからなっている。 The air pipe is provided with an air pipe 11 connected to the top of the upper chamber 3, it consists the air pipe 12 connected to the lower portion of the lower chamber 2, is connected to the top of the lower chamber 2 air pipes 13. . 空気配管1 Air pipe 1
1は二股に分岐し、それぞれの分岐管にバルブ11A、 1 is bifurcated, the valve 11A in the respective branch pipes,
11Bが取り付けられている。 11B is attached. また、他の空気各配管1 In addition, other air each pipe 1
2、13にはバルブ12A、13Aがそれぞれ取り付けられている。 Valve 12A is in 2, 13, 13A are attached, respectively. 更に、上記分配機構9の各分配管10にはそれぞれ孔10Aが形成され、下室2内へ供給された空気が分配機構9の下側に溜まって孔10Aを抜け、分配管10を介して上方の中空糸膜モジュール5の下端へ分配供給するようにしてある。 Furthermore, the each of the respective distribution tube 10 of the dispensing mechanism 9 hole 10A is formed, it passes through the hole 10A air supplied to the lower chamber 2 is collected in the bottom of the distribution mechanism 9, via the distribution pipes 10 It is to be distributed and supplied to the lower end of the upper hollow fiber membrane module 5. また、塔本体1の下端にはドレン抜き配管14が接続され、このドレン抜き配管1 Further, the lower end of the column body 1 is connected drainage pipe 14, the drainage pipe 1
4を介して懸濁物質を含んだ洗浄廃水を抜き取るようにしてある。 4 through are as extracting the washing waste liquid containing suspended matter. 尚、14Aはドレン抜き配管14に取り付けられたバルブである。 Incidentally, 14A is a valve mounted on the drainage pipe 14.

【0013】次に、上記中空糸膜モジュール5について図2を参照しながら説明する。 [0013] will be described below with reference to FIG. 2 for the hollow fiber membrane module 5. この中空糸膜モジュール5は、同図に示すように、100〜50000本前後の中空糸膜フィルタ51と、これらの中空糸膜フィルタ5 The hollow fiber membrane module 5, as shown in the drawing, a hollow fiber membrane filter 51 of 100 to 50,000 present before and after, these hollow fiber membranes filter 5
1を束ねて収納する保護筒52とを備えて構成されている。 It is constituted by a protective tube 52 for housing a bundle 1. 各中空糸膜フィルタ51は、例えば0.01〜0.3 Each hollow fiber membrane filter 51, for example, 0.01 to 0.3
μの微細孔を有する樹脂薄膜により外径0.3〜7m The outer diameter of a resin film having fine pores of mu 0.3~7M
m、内径0.2〜5mmの中空糸として形成されている。 m, and is formed as a hollow yarn inner diameter of 0.2 to 5 mm. また、保護筒52の上端部にはフランジ部52Aが形成され、このフランジ部52Aで上記仕切板4に垂下するようにしてある。 Further, the upper end portion of the protecting cylinder 52 is flange 52A is formed, are to be suspended in the partition plate 4 in this flange portion 52A. また、保護筒52の下端部にはスカート部52Bが形成され、このスカート部52Bで洗浄時に流入した空気を捕集するようにしてある。 Further, the lower end portion of the protecting cylinder 52 is the skirt portion 52B is formed, are so as to collect the air flowing during cleaning with the skirt portion 52B. そして、保護筒52の上端部で各中空糸膜フィルタ51の上端部を接着剤等により束ねて接合固定した上部接合部5 The upper joint upper ends were joined and fixed by bundling with an adhesive or the like of the protective tube 52 of the upper portion in the hollow fiber membrane filter 51 5
3が形成され、その下端部で各中空糸膜フィルタ51の下端部を上端部と同様に接合固定した下部接合部54が形成されている。 3 is formed, the lower end portion lower joint 54 similarly joined and fixed the upper end portion of each hollow fiber membrane filter 51 at its lower end portion is formed. 上部接合部53では各中空糸膜フィルタ51は開口し、下部接合部54では各中空糸膜フィルタ51は閉塞し、濾過水が中空糸膜フィルタ51の上端部開口から流出して上室3内で集水するようにしてある。 Each hollow fiber membrane filter 51 in the upper joint 53 is open, the hollow fiber membrane filter 51 in the lower joint 54 is closed, the upper chamber 3 filtered water flows out from the upper end opening of the hollow fiber membrane filter 51 in are to be collecting. また、下部接合部54には流通孔54Aが形成され、流通孔54Aを介してスカート部52Bに捕集した空気が中空糸膜モジュール5内へ流入するようにしてある。 Further, the lower joint portion 54 flow hole 54A is formed, the air trapped in the skirt portion 52B through the communication holes 54A are are so as to flow into the hollow fiber membrane module 5. 更に、上記保護筒52の上部接合部53のやや下方と、下部接合部54のやや上方にはそれぞれ流通孔52 Furthermore, little and below the upper joint 53 of the protecting cylinder 52, respectively flow hole 52 slightly above the lower joint 54
C、52Dが形成され、これらの流通孔52C、52D C, 52D are formed, these circulation holes 52C, 52D
を介して原水が中空糸膜モジュール5内へ流入するようにしてある。 Raw water through the are as flows into the hollow fiber membrane module 5.

【0014】上記中空糸膜モジュール5は片端集水型のものであるが、中空糸膜モジュールとしては各中空糸膜フィルタの両端から集水する、いわゆる両端集水型モジュールを用いることもできる。 [0014] Although the hollow fiber membrane module 5 is of the one end water collecting type, the hollow fiber membrane module to the catchment from both ends of each hollow fiber membrane filter, it is also possible to use a so-called two ends catchment type module. 両端集水型中空糸膜モジュール5Aは、図3に示すように、中空糸膜フィルタとして中空糸膜細糸フィルタ51及び中空糸膜太糸フィルタ51Aの2種類の中空糸膜フィルタを有している。 Across water collecting type hollow fiber membrane module 5A, as shown in FIG. 3, has two types of hollow fiber membrane filter of the hollow fiber membrane filament filter 51 and the hollow fiber MakuFutoshiito filter 51A as a hollow fiber membrane filter there. そして、各中空糸膜細糸フィルタ51及び各中空糸膜太糸フィルタ51Aはいずれも上下両端部が開口している。 Then, both the hollow fiber membrane filament filter 51 and the hollow fiber MakuFutoshiito filter 51A has upper and lower end portions are open.
特に、それぞれの下端部の開口は下部接合部54の下側に設けた濾過集水室55に連通しており、中空糸膜フィルタ51、51Aの濾過水を濾過集水室55において捕集する構造になっている。 In particular, the opening of each of the lower portion is communicated with the filtered water collecting chamber 55 which is provided on the lower side of the lower joint 54, for collecting the filtered water of the hollow fiber membrane filter 51,51A in the filtration water collecting chamber 55 It has a structure. 各中空糸膜細糸フィルタ51 Each hollow fiber membrane filament filter 51
の下部側で濾過された濾過水は一旦濾過集水室55に導かれ、その後濾過集水室55から中空糸膜太糸フィルタ51Aの内側を経由して上部接合部53から流出して上室3内で集水されるようにしてある。 Filtered water filtered by the lower side of which once introduced into the filtration water collecting chamber 55, the upper chamber then filtered current from the water chamber 55 via the inside of the hollow fiber MakuFutoshiito filter 51A flows out of the upper joint 53 It is to be collecting in the 3. また、各中空糸膜細糸フィルタ51の上部側で濾過された濾過水はそのまま中空糸膜細糸フィルタ51Aの内側を経由して上部接合部53から流出して上室3内で集水されるようにしてある。 Further, the filtered water filtered by the upper side of the hollow fiber membrane filament filter 51 is water collecting above chamber 3 flows out of the upper joint 53 via the inside of the hollow fiber membrane filament filter 51A as It is to so that. 尚、ここでいう中空糸膜細糸フィルタ51は片端集水型中空糸膜モジュール5に用いられた中空糸膜フィルタ51と同様のものである。 Incidentally, the hollow fiber membrane filament filter 51 here is similar to the hollow fiber membrane filter 51 used in the one end water collecting type hollow fiber membrane module 5.

【0015】次に、濾過動作について説明する。 [0015] Next, a description will be given of filtration operations. 原水を濾過する場合には、塔本体1の上下に配置された流入管6及び流出管7のバルブ6A、7Aをそれぞれ開放し、 When filtering the raw water, the valve 6A of the inlet pipe 6 and the outlet pipe 7 arranged above and below the column body 1, 7A and open respectively,
他のバルブを閉止する。 Closing the other valve. この状態で原水を供給すると、 Supplying raw water in this state,
原水は流入管6から下室2内に流入し、バッフルプレート8において分散され、分散された原水は分配機構9の分配管10及び分配機構9の周囲から各中空糸膜モジュール5に分配供給される。 Raw water flows into the lower chamber 2 from the inlet pipe 6, is dispersed in the baffle plate 8, the raw water that is dispersed is distributed and supplied from the periphery of the distribution pipe 10 and the distribution mechanism 9 of the dispensing mechanism 9 in the hollow fiber membrane module 5 that. 分配供給された原水は保護筒52の流通孔52C、52D及び下部結合部54の流通孔54Aを経由して各保護筒52内に流入する。 Was dispensed raw water flows through the circulation holes 54A through channel 52C, 52D and a lower coupling portion 54 of the protecting cylinder 52 in each protection cylinder 52. 各保護筒52内で原水はそれぞれの中空糸膜フィルタ51の外側から内側へ透過し、その際に原水中に含まれている懸濁物質が中空糸膜フィルタ51の外面で捕捉される。 Raw water inside the protective pipe 52 is transmitted from the outside of each hollow fiber membrane filter 51 to the inside, suspended substances contained in raw water at that time is captured in the outer surface of the hollow fiber membrane filter 51. 濾過水は各中空糸膜フィルタ51の内側で得られ、その濾過水は各中空糸膜フィルタ51内を上昇して各中空糸膜フィルタ51の上端開口から上室3内へ流出し、ここで集水され、引き続き、流出管7を介して塔外へ流出する。 Filtered water is obtained inside each hollow fiber membrane filter 51, and the outflow permeate water rises inside the hollow fiber membrane filter 51 from the upper end openings of the hollow fiber membrane filter 51 to the upper chamber 3, where is collecting, subsequently, flows out to the outside of the tower through the outlet pipe 7.

【0016】濾過を継続すると、図4の(a)に拡大して示すように各中空糸膜フィルタ51の外面に捕捉された懸濁物質Cが堆積し、中空糸膜フィルタ51の外側と内側との差圧が次第に上昇して行く。 [0016] continuing the filtration, suspended solids C trapped on the outer surface of the hollow fiber membrane filter 51 is deposited as shown in the enlarged view in FIG. 4 (a), the outer and inner hollow fiber membrane filter 51 the pressure difference between the rises gradually. 差圧が規定値以上になると通常、逆洗により膜差圧の回復を図ることになるが、各中空糸膜フィルタに多量の懸濁物質が圧密状態で堆積して各中空糸膜フィルタ間の隙間が懸濁物質で詰まり、あるいは粘着性の懸濁物質が堆積すると、単に中空糸膜モジュール内で空気をバブリングするだけでは中空糸膜フィルタから懸濁物質を殆ど剥離することができない。 Usually the differential pressure is equal to or greater than a prescribed value, it becomes possible to recover the membrane differential pressure by backwashing, a large amount of suspended solids in the hollow fiber membrane filter is deposited in compacted state between the hollow fiber membrane filter gap clogged with suspended solids, or the sticky suspended solids are deposited, simply bubbling air in the hollow fiber membrane module can not be hardly peeled off the suspended matter from the hollow fiber membrane filter. そこで、本発明の洗浄方法を用いて濾過塔の洗浄を行うことで中空糸膜フィルタ51の懸濁物質Cを除去し、膜差圧の回復を得ることができる。 Therefore, the suspended solids C to remove that a hollow fiber membrane filter 51 to clean the filtration tower using the cleaning method of the present invention, it is possible to obtain a recovery of the transmembrane pressure difference. 尚、図4の(a)において、Wは原水、W1は濾過水である。 Incidentally, in (a) of FIG. 4, W is raw water, W1 is filtered water.

【0017】次に、本発明の一本実施形態について図1 [0017] Next, one embodiment of the present invention FIG. 1
及び図4を参照しながら説明する。 And it will be described with reference to FIG. 本実施形態では各中空糸膜モジュール5内の多数本の中空糸膜フィルタ51 In this embodiment of the large number of in each hollow fiber membrane module 5 hollow fiber membrane filter 51
を洗浄する際に、二次室である上室3へ洗浄用薬液L When cleaning a cleaning solution L to the upper chamber 3 is the secondary chamber
(図4の(b)参照)を供給し、この洗浄用薬液Lを上室3から各中空糸膜フィルタ51を介して一次室である下室2へ透過させ、下室2内を洗浄用薬液Lで満たすことによって洗浄を行う。 Supplying (in see FIG. 4 (b)), and the cleaning solution L is transmitted through the upper chamber 3 into the lower chamber 2 is the primary chamber through the hollow fiber membrane filter 51, for cleaning the lower chamber 2 to wash by filling a chemical solution L. この洗浄に先立ち、まず塔本体1内の原水を抜き取る操作、いわゆるドレン抜き操作を行う。 Prior to the washing, first the operation to extract the raw water in the tower body 1, performs so-called drainage operation.

【0018】塔本体1内の原水を抜き取る際には、まず、流入管6及び流出管7のバルブ6A、7Aを閉止して通水を停止した後、下室2内及び上室3内が満水状態のまま空気配管12及び空気配管13のバルブ12A、 [0018] When extracting the raw water in the column body 1, first, the valve 6A of the inlet pipe 6 and the outlet pipe 7, after stopping the water flow closes the 7A, is in the lower chamber 2 and the upper chamber 3 while the air pipe 12 and the valve 12A of the air pipe 13 of the full-water conditions,
13Aを開放し、空気配管12から下室2内へ圧縮空気を供給し、分配機構9を介して各中空糸膜モジュール5 13A was opened to supply compressed air from the air pipe 12 into the lower chamber 2, the hollow fiber membranes through the distribution mechanism 9 Module 5
内で空気をバブリングさせる。 Bubbling air at the inner. ところが、各中空糸膜フィルタ51には図4の(a)で示すように極めて狭い隙間δしか残されていないか、あるいは隙間がない状態になっているため、この操作では中空糸膜フィルタ51から懸濁物質Cを殆ど除去することができない。 However, if not left only a very narrow gap δ as shown in (a) of FIG. 4 in the hollow fiber membrane filter 51, or because it is a state that there is no gap, the hollow fiber membrane filter 51 in this operation it is impossible to remove most of the suspended solids C from. また、この操作を行わずに単に下室2内の水をドレンしても良い。 Also, it may be simply drained water lower chamber 2 without this operation. この操作後、バルブ11A、14Aを開放して空気配管11から圧縮空気を供給するか、若しくは大気開放をして上室3内の濾過水を下室2へ逆流させながら下室2内の原水をドレン抜き配管14から徐々に排出し、全ての濾過水及び原水を排出した後、全てのバルブを一旦閉止し、ドレン抜き操作を終了する。 After this operation, the valve 11A, opens the 14A or supplying compressed air from the air pipe 11, or the raw water in the lower chamber 2 while backflow filtered water in the upper chamber 3 into the lower chamber 2 and the air release gradually discharged from the drainage pipe 14, after discharging all the filtered water and raw water, once closed all the valves, to end the drainage operation.

【0019】上述のドレン抜き操作後、本発明の洗浄方法を実施する。 [0019] After the above-mentioned drainage operation, carrying out the cleaning method of the present invention. それにはまず、バルブ7Aを開放すると共にバルブ11A、11Bを開放し、洗浄用薬液供給管15及び流出管7を介して例えば塩酸、過酸化水素等の洗浄用薬液Lを上室3内へ供給し、上室3内を洗浄用薬液Lで満たす。 It first opens the valve 11A, 11B with opening the valve 7A, supplied through the cleaning solution supply pipe 15 and the outlet pipe 7 for example hydrochloric acid, into the upper chamber 3 to the cleaning solution L such as hydrogen peroxide and fills the upper chamber 3 in the cleaning solution L. また、別途洗浄用薬液供給管を上室3側へ設け、そこから洗浄用薬液Lを上室3へ供給しても良い。 Further, separately provided cleaning solution supply pipe to the upper chamber 3 side, it may be supplied to the upper chamber 3 to the cleaning solution L from it. 次いで、バルブ11A、11Bを閉止すると共にバルブ13Aを開放した後、流出管7から洗浄用薬液Lを供給し続けると、図4(b)の矢印で示すように洗浄用薬液Lは各中空糸膜モジュール5内の各中空糸膜フィルタ51内を流下してその内側から外側へ徐々に透過して下室2へ流出する。 Then, after opening the valve 13A while closing valve 11A, the 11B, when continuing to supply the cleaning solution L from the outlet pipe 7, the cleaning solution L each hollow fiber as indicated by the arrows shown in FIG. 4 (b) It flows down each hollow fiber membrane filter 51 in the membrane module 5 flows out into the lower chamber 2 gradually transmitted from the inside to the outside. この際、膜外面に付着した懸濁物質Cの内側から洗浄用薬液Lが均一に懸濁物質Cに接触し、懸濁物質Cの堆積層の中空糸膜フィルタ51に接触している側(内側)から洗浄用薬液Lにより懸濁物質C In this case, contact the cleaning solution L is uniformly suspended solids C from the inside of the suspended matter C attached to Makugaimen, in contact with the hollow fiber membrane filter 51 of the deposited layer of suspended solids C side ( suspended matter C by the cleaning solution L from the inside)
が徐々にほぐされる。 There is loosened gradually. これと同時に懸濁物質Cの内側から外側へと徐々に洗浄用薬液Lが接触して下室2へ流出し、下室2内を洗浄用薬液Lで徐々に満たして行く。 At the flows to the lower chamber 2 simultaneously from the inside of the suspended matter C in contact gradually cleaning solution L to the outside, it meets gradually lower chamber 2 with cleaning solution L. このように本実施形態では洗浄用薬液Lが各中空糸膜フィルタ51の内側から外側へ透過することにより各中空糸膜フィルタ51の表面に堆積している懸濁物質Cと洗浄用薬液Lとが確実に接触し、懸濁物質Cが洗浄用薬液L Thus the cleaning solution L in the present embodiment is a suspended solids C deposited on the surface of the hollow fiber membrane filter 51 by passing through from the inside to the outside of each hollow fiber membrane filter 51 and the cleaning solution L is reliably contacted, suspended solids C is the cleaning solution L
によりほぐされて剥離可能な状態になって行く。 The loosened by going to become a peelable state.

【0020】その後更に、バルブ12A、13Aを開放し、空気配管12から圧縮空気を所定時間供給し、空気により洗浄用薬液Lを攪拌すると、各中空糸膜フィルタ51の表面に堆積している懸濁物質C表面、または懸濁物質Cの膜表面間の洗浄用薬液Lが更新されて洗浄作用が高まり、懸濁物質Cが更に剥離し易くなる。 [0020] After that further opened valve 12A, the 13A, the compressed air from the air pipe 12 to supply a predetermined time, when stirring the cleaning solution L by air suspension is deposited on the surface of each hollow fiber membrane filter 51 Pollution substances C surface or increases the cleaning action the cleaning solution L is updated between the membrane surfaces of the suspended matter C,, suspended solids C is likely to further separation. 空気を所定時間供給した後、洗浄用薬液Lが満杯状態のまま所定時間放置して洗浄用薬液Lを懸濁物質C内に含浸させ、 After the air was supplied for a predetermined time, the predetermined time left for the cleaning solution L and remains of the cleaning solution L is full state is impregnated into the suspended material C,
更に、空気を所定時間供給すると、各中空糸膜モジュール5の下部接合部54の流通孔54Aからも気泡が入り込むようになり、各中空糸膜フィルタ51の表面に堆積している懸濁物質Cに気泡が接触する。 Furthermore, when supplying air predetermined time, also become bubbles enter from the communication holes 54A of the lower joint portion 54 of the hollow fiber membrane module 5, suspended solids C deposited on the surface of the hollow fiber membrane filter 51 bubble comes into contact with. 懸濁物質Cは本実施形態による操作により十分剥離可能な状態になっているため、気泡と接触するだけで図4の(b)で示すように懸濁物質Cを殆ど剥離することができる。 Suspended solids C can because it become sufficiently peelable state by operation of the present embodiment, with little peeled suspended matter C as shown by (b) in FIG. 4 only in contact with the bubble. 剥離した懸濁物質Cはドレン抜き操作によって塔外へ排出することができる。 Peeled suspended materials C can be discharged into the column outside the drainage operation. 尚、本実施形態に洗浄方法は具体的には後述する実施例1で示した条件で実施した。 The cleaning method according to the present embodiment specifically was conducted under the conditions shown in Example 1 below.

【0021】以上説明したように本実施形態によれば、 According to the present embodiment as described above,
各中空糸膜モジュール5内の多数本の中空糸膜フィルタ51を洗浄する際に、二次室である上室3へ洗浄用薬液Lを供給し、この洗浄用薬液Lを上室3から各中空糸膜フィルタ51を介して一次室である下室2へ透過させ、 When cleaning a number of hollow fiber membrane filter 51 of the hollow fiber membrane module 5 supplies the cleaning solution L to the upper chamber 3 is a secondary chamber, each of the cleaning solution L from the upper chamber 3 through a hollow fiber membrane filter 51 is transmitted to the lower chamber 2 is primary chamber,
下室2内を洗浄用薬液Lで満たすようにしたため、懸濁物質Cが各中空糸膜フィルタ51に対して圧密状態で堆積し、しかも堆積量が増えて各中空糸膜フィルタ51が懸濁物質Cを介してくっつき一体化した状態になっても、洗浄用薬液Lが中空糸膜フィルタ51の内側から外側へ透過する間に全ての懸濁物質Cと確実に接触して懸濁物質Cを徐々にほぐされ、確実に懸濁物質Cを各中空糸膜フィルタ51から除去して差圧を大幅に回復することができ、濾過塔の濾過性能を回復することができ、ひいては中空糸膜モジュール5の寿命を延ばすことができる。 Because you meet the lower chamber 2 in the cleaning solution L, suspended solids C is deposited in compacted state with respect to the hollow fiber membrane filter 51, moreover deposition amount increases each hollow fiber membrane filter 51 is suspended even in a state where integral stick through the material C, suspended cleaning solution L is reliably contact with all suspended solids C during the transmission from the inside of the hollow fiber membrane filter 51 to the outer material C gradually loosened, and reliably remove the suspended solids C from the hollow fiber membrane filter 51 can be recovered significantly differential pressure, it is possible to recover the filtration performance of the filtration tower, thus hollow fiber membrane it is possible to extend the life of the module 5.

【0022】また、本発明の他の洗浄方法の一実施形態は、中空糸膜モジュール5内の中空糸膜フィルタ51を洗浄する際に、図5の(a)、(b)に示すように塔本体1内の下室2へ洗浄用薬液Lを供給しながら各中空糸膜モジュール5内に空気を供給し、この空気により各中空糸膜モジュール5内の洗浄用薬液Lを攪拌しながら下室2内を洗浄用薬液Lで満たす方法である。 Further, an embodiment of another cleaning method of the present invention, when cleaning the hollow fiber membrane filter 51 of the hollow fiber membrane module 5, as shown in FIG. 5 (a), (b) air is supplied to the column body each hollow fiber membrane module 5 while supplying the cleaning solution L to the lower chamber 2 in 1, under stirring to the cleaning solution L of the hollow fiber membrane module 5 by the air it is a method that satisfies the chamber 2 in the cleaning solution L.

【0023】それにはまず、上記実施形態の場合と同様に中空糸膜モジュール5の逆洗及び塔本体1内のドレン抜きを行う。 [0023] it is first performs drainage of the backwashing and the tower body 1 as in the case the hollow fiber membrane module 5 in the above embodiment. 次いで、バルブ6A、13Aを開放した後、洗浄用薬液Lを流入管6から供給する。 Then, after opening valves 6A, a 13A, and supplies the cleaning solution L from the inlet pipe 6. 洗浄用薬液Lの液面が各中空糸膜モジュール5に到達する時点からバルブ12Aを開放して空気配管12から圧縮空気を供給すると、図5の(a)に示すようにこの空気は分配機構9の分配管10及びその周囲から気泡Aとなって洗浄用薬液Lの表面を激しく波立たせる。 When the liquid level of the cleaning solution L is supplied with compressed air by opening the valve 12A from the air pipe 12 from the point of reaching each hollow fiber membrane module 5, the air distribution mechanism as shown in FIG. 5 (a) vigorously to surged surface of the cleaning solution L from the distributor pipe 10 and around the 9 as bubbles a. この波立ちにより各中空糸膜モジュール5内の中空糸膜フィルタ51は図5(b)の矢印で示すように特に波立っている液面と接している部分が横方向に激しく振動する。 The hollow fiber membrane filters 51 of each hollow fiber membrane module 5 This rippling is the portion in contact with the liquid surface which is particularly choppy as indicated by the arrow shown in FIG. 5 (b) to vibrate violently laterally. この時、仮に各中空糸膜フィルタ51同士が懸濁物質Cによってくっついていても、この振動により各中空糸膜フィルタ51 At this time, even if stuck tentatively by the hollow fiber membrane filter 51 to each other suspended solids C, the hollow fiber membrane filter 51 by the vibration
間の懸濁物質Cが洗浄用薬液Lの洗浄作用と相俟って徐々にほぐされることになる。 Suspended solids C is to be loosened gradually I cleaning action coupled with the cleaning solution L between. つまり、空気のバブリング時の洗浄用薬液Lの液面の波立ちによって各中空糸膜フィルタ51に振動を付与し、懸濁物質Cの圧密化をほぐしながら洗浄用薬液Lを供給するため、各中空糸膜フィルタ51間の懸濁物質C内へ洗浄用薬液Lが浸透し易くなり、ひいては懸濁物質Cと洗浄用薬液Lとの接触面積を徐々に拡大し、洗浄用薬液Lの洗浄作用が懸濁物質C That is, since the vibration imparted to the hollow fiber membrane filter 51 by the rippling of the liquid surface of the cleaning solution L with bubbling air, supplying the cleaning solution L while disentangling the compaction of suspended solids C, each hollow cleaning solution L into suspended substance in C between fiber membrane filter 51 is easily penetrated, gradually expanding the contact area between the cleaning solution L and thus suspended matter C, cleaning action of the cleaning solution L is suspended solids C
に効果的に及ぶことになる。 It will effectively extend it to. また、洗浄用薬液Lを供給しながら空気を供給することにより、波立っている液面が中空糸膜モジュール5の下方から上方へ移動することになり、各中空糸膜フィルタ51全体に均一に振動を付与することができる。 Moreover, by supplying air while supplying a cleaning solution L, will be a liquid surface that choppy moves from below the hollow fiber membrane module 5 upward, uniformly throughout the hollow fiber membrane filter 51 it is possible to impart a vibration.

【0024】やがて下室2内が洗浄用薬液Lで満杯になる。 [0024] Eventually the lower chamber 2 becomes filled with cleaning solution L. この時、懸濁物質Cは洗浄用薬液Lの液面の波立ちによりかなりほぐされた状態になっており、洗浄用薬液Lが各中空糸膜フィルタ51間の懸濁物質C内に比較的容易に浸透する。 At this time, suspended substances C has become quite loosened state by rippling of the liquid surface of the cleaning solution L, the cleaning solution L is relatively easy in the suspended solids C between the hollow fiber membrane filter 51 to penetrate into. 下室2が洗浄用薬液Lで満杯になった状態で所定時間放置して各中空糸膜モジュール5を洗浄用薬液L中に浸漬しおくと、懸濁物質C内に浸透した洗浄用薬液Lの働きで懸濁物質Cが更にほぐされ易くなる。 When the lower chamber 2 is kept immersed the respective hollow fiber membrane module 5 and left for a predetermined time in a state that has become full in the cleaning solution L in the cleaning solution L, the cleaning solution L which penetrates into the suspended substance C suspended solids C by the action are easily further loosened for. その後、再び下室2内に空気を供給して洗浄用薬液L中を激しくバブリングさせると、懸濁物質Cが各中空糸膜フィルタ51から剥離する。 Thereafter, when the vigorous bubbling cleaning chemical solution L by supplying air to the lower chamber 2 again, suspended solids C is peeled off from the hollow fiber membrane filter 51. 剥離した懸濁物質Cはドレン抜き操作によって排出することができる。 Peeled suspended materials C can be discharged by drainage operation. 尚、本実施形態に洗浄方法は具体的には後述する実施例2で示した条件で実施した。 The cleaning method according to the present embodiment specifically was conducted under the conditions shown in Example 2 described later.

【0025】以上説明したように本実施形態によれば、 According to the present embodiment as described above,
下室2へ洗浄用薬液Lを供給しながら各中空糸膜モジュール5内に空気を供給し、この空気により各中空糸膜モジュール5内の洗浄用薬液Lを攪拌しながら下室2内を洗浄用薬液Lで満たすようにしたため、洗浄用薬液Lの液面が波立ち、この波立ちが各中空糸膜フィルタ51の下方から上方へ移動することによって各中空糸膜モジュール5の各中空糸膜フィルタ51全体に波立ちによる振動が付与され、この振動によってほぐされた各中空糸膜フィルタ51間の懸濁物質C内へ洗浄用薬液Lが浸透することができる。 Supplying air to the hollow fiber membrane module 5 while supplying the cleaning solution L to the lower chamber 2, washed lower chamber 2 with stirring the cleaning solution L of the hollow fiber membrane module 5 by the air because you meet in use medicinal liquid L, the cleaning liquid surface of the medicinal liquid L is waving, the hollow fiber membrane filter 51 of each hollow fiber membrane module 5 by the rippling moves upward from below the respective hollow fiber membrane filter 51 whole is vibrated by the grant waving, cleaning solution L into suspended substance in C between the hollow fiber membrane filter 51 loosened by the vibrations can penetrate. 従って、懸濁物質Cが各中空糸膜フィルタ51に対して圧密状態で堆積し、しかも堆積量が増え、懸濁物質Cを介して各中空糸膜フィルタ51がくっついて一体化した状態になっても、各中空糸膜フィルタ51間の懸濁物質C内へ洗浄用薬液Lが浸透して懸濁物質Cと効率良く接触し、懸濁物質Cを各中空糸膜フィルタ51から効果的に除去して初期の差圧を取り戻し、濾過塔の濾過性能を回復することができ、ひいては中空糸膜モジュール5の寿命を延ばすことができる。 Thus, suspended matter C is deposited in compacted state with respect to the hollow fiber membrane filter 51, moreover increased accumulation amount, the state via the suspended matter C is the hollow fiber membrane filter 51 are integrated stuck also, the cleaning solution L permeates contact suspended solids C and efficiently into the suspended material C between the hollow fiber membrane filter 51, the suspended solids C effectively from the hollow fiber membrane filter 51 removed to regain the initial pressure difference, it is possible to recover the filtration performance of the filtration tower, can thus extend the life of the hollow fiber membrane module 5.

【0026】実施例1 本実施例では原水を10日間処理した下記濾過塔の洗浄を下記条件で実施し、洗浄によって剥離した懸濁物質C [0026] The following filtration column wash treated raw water 10 days in Example 1 This example was carried out under the following conditions, suspended substances C peeled by washing
を測定した結果、下記表1に示す結果が得られた。 A result of measuring the results shown in Table 1 were obtained. 尚、 still,
薬液洗浄を実施する前の空気バブリングは本発明には直接影響しないため、その操作条件を省略した。 Since the air bubbling before carrying out the chemical cleaning is to present invention it does not directly affect, omit the operation conditions. このことは実施例1及び比較例1においても同様である。 This is the same in Example 1 and Comparative Example 1. 〔洗浄条件〕 1. [Washing conditions] 1. 濾過塔 (1)塔本体の寸法 外径:70mm 内径:54mm (2)中空糸膜モジュール 中空糸膜フィルタ本数:170本 中空糸膜フィルタ内径:0.7mm 中空糸膜フィルタ外径:1.2mm 2. Dimensions outside diameter of the filtration tower (1) the column body: 70 mm inside diameter: 54 mm (2) The hollow fiber membrane module the hollow fiber membrane filter Number: 170 This hollow fiber membrane filter inner diameter: 0.7 mm hollow fiber membrane filter OD: 1.2 mm 2. 洗浄操作条件 (1)洗浄用薬液:1N塩酸 (2)空気のバブリング 空気流量:3.3NL/分 バブリング時間:10分 (3)バブリング後の浸漬時間:3時間 (4)浸漬後の空気のバブリング 空気流量:3.3NL/分 バブリング時間:10分 Washing conditions (1) cleaning solution: 1N hydrochloric acid (2) Air bubbling air flow: 3.3NL / min bubbling Time: 10 min (3) Immersion time after bubbling: 3 hours (4) after immersion of the air bubbling air flow rate: 3.3NL / minute bubbling time: 10 minutes

【0027】実施例2 本実施例では実施例1で用いた濾過塔について下記条件で洗浄を実施した結果、下記表1に示す結果が得られた。 [0027] EXAMPLE 2 In embodiment result of the washing under the following conditions for the filtration column used in Example 1, the results shown in Table 1 were obtained. 〔洗浄条件〕 1. [Washing conditions] 1. 洗浄操作条件 (1)洗浄用薬液:1N塩酸 (2)洗浄用薬液の流量:60L/時間 (3)洗浄用薬液供給時の空気のバブリング 空気流量:3.3NL/分 バブリング時間:5分 (4)満杯後の浸漬時間:3時間 (5)浸漬後の空気のバブリング 空気流量:3.3NL/分 バブリング時間:10分 Washing conditions (1) cleaning solution: a 1N hydrochloric acid (2) the cleaning solution flow rate: 60L / Time (3) bubbling air flow rate of air at the time of the cleaning solution supply: 3.3NL / min bubbling Time: 5 min ( 4) immersion time after full: 3 hours (5) air after immersion in the bubbling air flow: 3.3NL / min bubbling time: 10 minutes

【0028】比較例1 本比較例では上記各実施例で用いた濾過塔と同一の濾過塔を従来の洗浄方法(洗浄用薬液を下室2に満たした後、空気をバブリングさせて所定時間放置して中空糸膜モジュール51を浸漬し、更に空気をバブリングした後、ドレン抜きを行う方法)によって洗浄した結果、下記表1に示す結果が得られた。 [0028] After filling the conventional cleaning method (cleaning solution filtered tower same filtration tower used in the above embodiments the lower chamber 2 in Comparative Example 1 This comparative example, left for a predetermined by bubbling air time a hollow fiber membrane module 51 is immersed, after further bubbling air, as a result of the cleaning by the method) of performing drainage, the results shown in table 1 were obtained. 〔洗浄条件〕 1. [Washing conditions] 1. 洗浄操作条件 (1)洗浄用薬液:1N塩酸 (2)満杯後の浸漬時間:3時間 (3)浸漬前の空気のバブリング 空気流量:3.3NL/分 バブリング時間:10分 Washing conditions (1) cleaning solution: 1N hydrochloric acid (2) Immersion time after full: 3 hours (3) bubbling air flow in the air before dipping: 3.3NL / min bubbling Time: 10 minutes

【0029】 [0029]

【表1】 [Table 1] 表1に示す結果からも明らかなように、実施例1では懸濁物質Cの隔離量が比較例1よりも格段に多く、洗浄後の差圧回復倍率が比較例1の2.5倍になっていることが判る。 From the results shown in Table 1 As is apparent, significantly more than the Comparative Example 1 is sequestration of Example 1, suspended solids C, differential pressure recovery ratio after washing in 2.5 times Comparative Example 1 it can be seen that it is. また、実施例2の場合には実施例1よりも洗浄効果が低下しているが、差圧回復倍率が比較例1の1. Although cleaning effect is lowered than that of Example 1 in the case of Example 2, the differential pressure recovery ratio of Comparative Example 1 1.
5倍に達し、従来の洗浄方法よりもかなり優れていることが判る。 5x reached, it can be seen that significantly better than conventional cleaning methods.

【0030】尚、本発明は上記各実施形態に何等制限されものではないことは云うまでもない。 [0030] The present invention it is needless to say that not be any limitation to the above embodiments. 例えば、上記実施形態では片端集水型濾過塔について説明したが、図3 For example, in the above embodiment has been described one end catchment filtration column, 3
に示すような両端が開口した中空糸膜フィルタに対しても本発明を適用することができる。 Also possible to apply the present invention to the hollow fiber membrane filter having both ends opened as shown in. また、本発明の洗浄方法の操作条件は原水の種類に応じて適宜設定することができる。 Also, the operating conditions of the cleaning method of the present invention can be appropriately set according to the type of raw water.

【0031】 [0031]

【発明の効果】本発明の請求項1または請求項2に記載の発明によれば、洗浄用薬液による洗浄効果を高めて中空糸膜フィルタを効率良く洗浄することができ、ひいては中空糸膜フィルタの差圧上昇を防止してその寿命を延ばすことができる中空糸膜濾過塔の洗浄方法を提供することができる。 According to the invention described in claim 1 or claim 2 of the present invention, to enhance the cleaning effect of the cleaning solution can a hollow fiber membrane filter efficiently cleaned, thus hollow fiber membrane filter to prevent the differential pressure increase can provide a method for cleaning the hollow fiber membrane filtration column which can extend its life.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の濾過塔の洗浄方法の一実施形態に用いられる中空糸膜濾過塔の構成を示す断面図である。 1 is a cross-sectional view showing the configuration of a hollow fiber membrane filtration column used in one embodiment of a method for cleaning a filtration tower of the present invention.

【図2】図1に示す中空糸膜濾過塔に用いられる中空糸膜モジュールを示す断面図である。 2 is a sectional view showing a hollow fiber membrane module used in the hollow fiber membrane filtration tower shown in FIG.

【図3】本発明の濾過塔の他の実施形態に用いられる両端集水型中空糸膜モジュールを示す断面図である。 3 is a cross-sectional view showing the ends catchment type hollow fiber membrane module used in another embodiment of the filtration tower of the present invention.

【図4】本発明の濾過塔の洗浄方法の一実施形態による洗浄作用を説明するための断面図で、(a)は洗浄処理直前の状態を示す図、(b)は洗浄により懸濁物質が剥離する状態を示す図である。 [Figure 4] a sectional view for explaining the cleaning action according to an embodiment of the method of cleaning a filtration tower of the invention, (a) is a diagram showing a state of the cleaning process immediately before, (b) is suspended by washing substance There is a view showing a state of peeling.

【図5】本発明の濾過塔の洗浄方法の他の実施形態による洗浄作用を説明するための図で、(a)は洗浄と中の中空糸膜モジュールを示す断面図、(b)は(a)に示す中空糸膜モジュールの中空糸膜フィルタを拡大して示す断面図である。 [5] a diagram for explaining the cleaning action according to another embodiment of the method for cleaning a filtration tower of the present invention, (a) is a sectional view showing a hollow fiber membrane module in cleaning and, (b) is ( it is an enlarged cross-sectional view showing a hollow fiber membrane filter of the hollow fiber membrane module shown in a).

【符号の説明】 DESCRIPTION OF SYMBOLS

1 塔本体 2 下室(一次室) 3 上室(二次室) 4 仕切板(仕切部材) 5 中空糸膜モジュール 51 中空糸膜フィルタ C 懸濁物質 L 洗浄用薬液 1 column body 2 the lower chamber (primary chamber) 3 upper chamber (the secondary chamber) 4 partition plate (partition member) 5 hollow fiber membrane module 51 hollow fiber membrane filter C suspended solids L cleaning solution

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 塔本体内を一次室と二次室に区画する仕切部材と、この仕切部材に端部が固定され且つ上記塔本体の軸心に沿って上記一次室内に配設された中空糸膜モジュールとを備え、上記一次室に流入した原水を上記中空糸膜モジュール内の多数本の中空糸膜フィルタによって濾過し、この濾過水を上記二次室へ流出させる中空糸膜濾過塔において、上記中空糸膜フィルタを洗浄する際に、上記二次室へ洗浄用薬液を供給し、この洗浄用薬液を上記中空糸膜フィルタを介して上記一次室へ流入させることを特徴とする中空糸膜濾過塔の洗浄方法。 1. A and the partition member for partitioning the interior of the column body in the primary chamber and the secondary chamber, hollow this partition member end disposed in the primary chamber above along the axis of the fixed and the tower body and a fiber membrane module, the raw water flowing into the primary chamber is filtered by a number of hollow fiber membranes filter in the hollow fiber membrane module, the filtered water in the hollow fiber membrane filtration tower to flow out into the secondary chamber , when washing the hollow fiber membrane filter, hollow fiber supplying the cleaning solution into the secondary chamber, the cleaning solution, characterized in that is flowed into the primary chamber through the hollow fiber membrane filter method of cleaning a membrane filtration tower.
  2. 【請求項2】 塔本体内を一次室と二次室に区画する仕切部材と、この仕切部材に端部が固定され且つ上記塔本体の軸心に沿って上記一次室内に配設された中空糸膜モジュールとを備え、上記一次室に流入した原水を上記中空糸膜モジュール内の多数本の中空糸膜フィルタを介して濾過し、この濾過水を上記二次室へ流出させる中空糸膜濾過塔において、上記中空糸膜フィルタを洗浄する際に、上記一次室へ洗浄用薬液を供給しながら上記一次室へ空気を供給し、上記一次室内を上記洗浄用薬液で満たすことを特徴とする中空糸膜濾過塔の洗浄方法。 Wherein a partition member for partitioning the interior of the column body in the primary chamber and the secondary chamber, hollow this partition member end disposed in the primary chamber above along the axis of the fixed and the tower body and a fiber membrane module, the raw water flowing into the primary chamber is filtered through a large number of hollow fiber membranes filter in the hollow fiber membrane module, hollow fiber membrane filtration to flow out the filtered water into the secondary chamber in the tower, hollow when washing the hollow fiber membrane filter, while supplying a cleaning solution into the primary chamber to supply air to said primary chamber, said primary chamber and satisfies the above cleaning solution fiber membrane filtration tower method of cleaning.
JP15593397A 1997-05-29 1997-05-29 Method for cleaning hollow yarn membrane filtration tower Pending JPH10328538A (en)

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