JP2000189958A - Immersion type membrane filter device - Google Patents

Immersion type membrane filter device

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Publication number
JP2000189958A
JP2000189958A JP10372468A JP37246898A JP2000189958A JP 2000189958 A JP2000189958 A JP 2000189958A JP 10372468 A JP10372468 A JP 10372468A JP 37246898 A JP37246898 A JP 37246898A JP 2000189958 A JP2000189958 A JP 2000189958A
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Prior art keywords
solid
membrane
liquid
separation membrane
liquid separation
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Pending
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JP10372468A
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Japanese (ja)
Inventor
Yukio Kobayashi
Tatsuhiko Suzuki
幸夫 小林
辰彦 鈴木
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Maezawa Ind Inc
前澤工業株式会社
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Priority to JP10372468A priority Critical patent/JP2000189958A/en
Publication of JP2000189958A publication Critical patent/JP2000189958A/en
Application status is Pending legal-status Critical

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Abstract

PROBLEM TO BE SOLVED: To provide a solid-liquid separator and the washing method for restraining growth of a cake layer on a separation membrane surface which is a factor for lowering a transmission flow flux and effectively remove the grown cake layer. SOLUTION: The separation membrane is hold in a protective cylinder 4 having an opened port at the lower edge, and having a water passing port 45 on the upper part side face, and the upper edge of a flow path inside the membrane of the separation membrane is opened on the upper end of the protective cylinder 4 to connect to a separated liquid discharge tube 9, and also the upper end part of the protective cylinder 4 is fixed to a suspending frame 7 of the protective cylinder 4 provided so as to enable to move vertically with respect to a solid-liquid separation tank 3, and a cylinder 6 being a driving means for vertically oscillating the suspending frame 7 of the protective cylinder 4 is provided on the upper part of the solid-liquid separation tank 3.

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、浸漬型膜ろ過装置に関し、詳しくは、浄水処理、排水処理等に用いられる浸漬型膜ろ過装置に関する。 BACKGROUND OF THE INVENTION The present invention relates to a submerged membrane filtration apparatus, particularly, water treatment, to submerged membrane filtration apparatus used in waste water treatment and the like.

【0002】 [0002]

【従来の技術及び発明が解決しようとする課題】従来から、不織布,精密ろ過膜,限外ろ過膜等の平膜状の分離膜や、微細な目のスクリーンを利用して固液分離を行う固液分離装置が浄水処理や排水処理等に用いられている。 From BACKGROUND OF SUMMARY OF THE INVENTION Conventionally, performed nonwoven, microfiltration membrane, or a flat membrane of the separation membrane such as ultrafiltration membranes, the solid-liquid separation by using a fine eye screen solid-liquid separator is used for water treatment and wastewater treatment. このような固液分離装置は、固液分離槽内の原水中に分離膜を浸漬し、膜内側を相対的に減圧状態とすることによって液体(処理水)のみを分離膜の外側から内側に透過させ、これによって固液分離を行うものである。 Such solid-liquid separation device, solid-liquid immersed raw water to the separation membrane in the separation tank, the liquid by the membrane inner relatively reduced pressure (treated water) only from the outside to the inside of the separation membrane is transmitted, thereby performs a solid-liquid separation.

【0003】一方、原水中の固形物は、上記固液分離操作によって分離膜の表面に付着した状態になるため、操作の進行に伴って次第に厚く堆積し、ケーキ層となって分離膜の分離能力、すなわち透過流束を低下させることになる。 On the other hand, the solids in the raw water, said solid-liquid separation by for a state adhered to the surface of the separation membrane, with the progress of the operation and gradually deposited thick, separation of the separation membrane is a cake layer capability, that is, reducing the flux. このため、従来から、分離膜の下方から散気を行ったり、分離膜の吸引側から水や空気を逆流させたり、膜面に高圧水を噴射したりして膜面のケーキ層を物理的に剥離したり、薬液によって化学的に洗浄したりしている。 Therefore, conventionally, or perform air diffusion from below the separation membrane, or by reflux with water or air from the suction side of the separation membrane, physical cake layer of the membrane surface or by injecting high-pressure water to the film surface or delaminate, and or cleaned chemically by chemical.

【0004】一般的には、分離膜の下方に設置した散気管から、分離膜の単位断面積に対して0.7〜1.0m [0004] In general, from the installation the diffusing pipe below the separation membrane, 0.7 to 1.0 M to the unit cross-sectional area of ​​the separation membrane
/min程度の空気量を1〜2分間曝気し、得られる気液二相流による旋回流と気泡による膜の振動による効果によって膜面全体の付着物を剥離し、透過流束の回復を図っている。 / Amount of air around min aeration for 1-2 minutes, then stripped of deposits across the membrane surface by the effect of the vibration of the membrane due to the swirling flow and bubbles due to gas-liquid two-phase stream obtained, aimed at the recovery of flux ing. さらに、膜の二次側(内側)から、分離膜の単位断面積に対して1.5〜2.5m/min程度の洗浄速度で10〜30秒間通水を行う逆流洗浄を併用し、相乗効果により堆積物の剥離効果を向上させることも行われている。 Furthermore, from the secondary side of the membrane (inner), a combination of backwashing performing 10-30 seconds through water in the washing rate of about 1.5~2.5m / min to a unit sectional area of ​​the separation membrane, a synergistic It has also been possible to improve the peeling effect of the deposits by effect.

【0005】また、粉末活性炭循環型の膜ろ過装置においては、固液分離槽内に粉末活性炭を添加し、水中の溶解性有機物を吸着除去し、処理水質の向上を目指している。 Further, in the powdered activated carbon circulation type membrane filtering device, the addition of powdered activated carbon in the solid-liquid separation tank, and adsorb and remove soluble organic substances in the water is aimed at improving the quality of treated water. 粉末活性炭は、飽和吸着量に達するまで固液分離槽内に滞留して吸着・ろ過操作が繰り返され、時間の経過に伴って活性炭のスラリーが分離膜の表面に付着し、成長してケーキ層が形成される。 Powder activated carbon, adsorption-filtration was retained in the solid-liquid separation tank to reach the saturated adsorption amount is repeated, a slurry of activated carbon adhered to the surface of the separation membrane with the passage of time, the cake layer to grow There is formed. これにより、ろ過形態はケーキろ過を呈することになるが、徐々に透過流束が低下する現象を示す。 Thus, filtration mode becomes to exhibit a cake filtration, exhibit the phenomenon gradually permeate flux decreases.

【0006】この場合も、上述の物理的な洗浄を行うことによって部分的に透過流束を回復させることは可能であるが、更に洗浄効果を高めるため、散気量の増加や逆洗速度の増加、あるいは、それぞれの時間を変更するなどの手段が考えられるが、エネルギー効率の問題や膜材質の耐久性との絡みから現実的ではない。 [0006] In this case, it is possible to recover the partially flux by performing physical cleaning described above, in order to further enhance the cleaning effect, aeration amount of increase or backwashing velocity increase, or, although means such as changing the respective time considered not realistic in entanglement with the problem of durability and film material of the energy efficiency. また、散気や逆洗は、膜面全体を均一に洗浄することが困難であり、 Also, the air diffuser and backwashing is difficult to uniformly clean the entire membrane surface,
デッドスペースが発生してその部分からケーキ層が成長する傾向にある。 Cake layer from the partial dead space is generated and there is a tendency to grow.

【0007】一方、薬液による洗浄は、膜面に付着した固形物だけでなく、スケールの除去も行えるため、適当な間隔で行わなければならないが、従来の方法では、分離膜を固液分離槽から取出して薬液槽に移さなければならず、手間が掛かり、薬液のコスト等の問題もあり、分離膜の寿命にも悪影響を与えるため、頻繁に薬液洗浄を行うことは得策ではない。 On the other hand, washing with a chemical solution, not just solids adhering to the membrane surface, since that allows even the removal of the scale, but must be performed at appropriate intervals, in the conventional method, solid-liquid separation tank separating membrane withdrawn from must be transferred to the chemical tank, labor intensive, there is also a problem such as cost of the chemical, for an adverse effect to the life of the separation membrane, it is not advisable to perform frequent chemical cleaning.

【0008】そこで本発明は、透過流束を低下させる要因である分離膜表面へのケーキ層の成長を抑制するとともに、成長したケーキ層の剥離も効果的に行うことができる固液分離装置及びその洗浄方法を提供することを目的としている。 [0008] The present invention is to suppress the growth of the cake layer to a factor that lowers the flux separation membrane surface, solid-liquid can be carried out separation of grown cake layer is also effective separation device and and its object is to provide the cleaning method.

【0009】 - 0009]

【課題を解決するための手段】上記目的を達成するため、本発明の浸漬型膜ろ過装置は、固液分離槽内に浸漬した分離膜によって固液分離を行う固液分離装置において、下端が開口し、上部側面に通水口を有する保護筒内に分離膜を保持し、該分離膜の膜内流路上端を保護筒上端に開口させて分離液導出管に接続するとともに、該保護筒の上端部を、固液分離槽に対して上下動可能に設けられた保護筒吊下げ枠に固定し、該保護筒吊下げ枠を上下に揺動させる駆動手段を前記固液分離槽の上部に設けたことを特徴とし、さらに、前記固液分離槽の底部に散気管を備えていることを特徴としている。 To achieve the above object, according to an aspect of, submerged membrane filtration apparatus according to the present invention is a solid-liquid separator for performing solid-liquid separation by a separation membrane was immersed in the solid-liquid separation tank, the lower end open, holding the separation membrane in a protective tube having a passage Mizuguchi the top side, together with by opening the protecting cylinder upper intramembranous flow path end of the separation membrane is connected to a separated liquid discharge pipe, the protective cylinder the upper end fixed to the lower frame hanging protecting cylinder which is vertically movable with respect to solid-liquid separation tank, a drive means for oscillating the lower frame hanging the protective tube up and down on top of the solid-liquid separation tank and characterized by providing, further characterized by comprising a sparge tube the bottom of the solid-liquid separation tank.

【0010】 [0010]

【発明の実施の形態】図1は本発明の浸漬型膜ろ過装置の一形態例を示す断面図、図2は保護筒の一例を示す一部断面正面図、図3は保護筒を吊下げ固定する吊下げ枠の一例を示す平面図である。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Figure 1 is a sectional view showing an embodiment of a submerged membrane filtration apparatus of the present invention, partially cross-sectional front view Figure 2 shows an example of the protective tube, Fig 3 is suspended a protective pipe is a plan view showing an example of a hanging frame for fixing.

【0011】この浸漬型膜ろ過装置は、原水流入管1及び排水管2を有する固液分離槽3に、保護筒4に収納した状態の分離膜5を浸漬するとともに、保護筒4の上端部を、シリンダー6によって上下動する保護筒吊下げ枠7で支持したものである。 [0011] The submerged membrane filtration apparatus, the solid-liquid separation tank 3 having a water inlet pipe 1 and the drainage pipe 2, while immersed separation membrane 5 in the state housed in the protective tube 4, the upper end of the protective tube 4 and those obtained by supporting an lower frame 7 suspended protecting cylinder moves up and down by the cylinder 6. また、固液分離槽3の底部には、少なくとも前記保護筒4内に散気を行うことができる散気管8が設けられている。 Further, the bottom portion of the solid-liquid separation tank 3, pipe 8 diffuser can perform air diffusion to at least the protective cylinder 4 is provided.

【0012】保護筒4は、図2に示すように、上下が開口した筒体41からなるものであって、分離膜5は、上部が整束板42により保持され、下部がステー縦棒43 [0012] protecting cylinder 4, as shown in FIG. 2, top and bottom be made of a cylindrical body 41 having an opening, the separation membrane 5, the upper is held by Seitababan 42, bottom stay vertical bar 43
に取付けられたステー横棒44により保持されている。 It is held by stays horizontal bar 44 attached to.
また、保護筒4の上部側面には、通水口45が設けられており、該通水口45より上方は、接着封止剤46により封止されている。 Further, the upper side surface of the protective tube 4 has passed Mizuguchi 45 disposed, is above the vent Mizuguchi 45, are sealed by the adhesive sealant 46. さらに、保護筒4の上端部には、周囲にOリング47を備えた端板48が装着されており、 Further, the upper end of the protective tube 4 is mounted is the end plate 48 with an O-ring 47 around,
この端板48に分離液導出管9の端部を被着することにより、分離膜5の膜内流路と分離液導出管9とが接続した状態となる。 By depositing the end of the separated liquid discharge pipe 9 to the end plate 48, a state of film flow channel of the separation membrane 5 and the separated liquid discharge pipe 9 is connected.

【0013】前記保護筒吊下げ枠7は、図3に示すように、一対の横枠71と複数の縦枠72とを梯子状に枠組みしたものであって、両横枠71と両縦枠72とで画成された角形空間内に、前記保護筒4の筒体41が挿入されている。 [0013] The protective tube hanging frame 7, as shown in FIG. 3, and a pair of transverse frame 71 and a plurality of vertical frames 72 be one obtained by framework ladder, Ryoyokowaku 71 and Ryotatewaku 72 the de picture made a prismatic space, the tubular body 41 of the protective tube 4 is inserted. そして、この保護筒吊下げ枠7には、固液分離槽3の上部に掛渡されたフレーム31に装着された前記シリンダー6のロッド61が接続されており、該ロッド61によって保護筒吊下げ枠7は、固液分離槽3内に上下動可能に吊下げられた状態となっている。 Then, this protecting cylinder hanging frame 7 has a rod 61 of the cylinder 6 mounted on the frame 31 looped at the top of the solid-liquid separation tank 3 is connected, suspended protecting cylinder by said rod 61 frame 7 is set in a state of being suspended to be movable up and down in the liquid separation tank 3.

【0014】すなわち、シリンダー6を作動させてロッド61を伸縮させることにより、保護筒吊下げ枠7を介して保護筒4を上下に揺動させることができるように形成されている。 [0014] That is, by extending and retracting the rod 61 by operating the cylinder 6, is formed so as to be able to swing the protective pipe 4 vertically through the lower frame 7 suspended protecting cylinder. このようにして保護筒4を上下動させると、固液分離槽3内の水は、保護筒4の下端開口と通水口45とを通って筒体41内を上下動するので、筒体4 In this manner, when the vertically moving the protective tube 4, water of the solid-liquid separation tank 3, since the vertical movement of the tubular body 41 through the lower end opening and passage Mizuguchi 45 of the protective tube 4, the cylindrical body 4
1内には、分離膜5の表面に沿った水流が発生することになる。 Within 1, so that the water flow along the surface of the separation membrane 5 is generated.

【0015】したがって、膜面にある程度の固形物が付着堆積した時点で、あるいは定期的にシリンダー6を作動させて保護筒4を上下動させることにより、分離膜5 [0015] Thus, by vertically moving at a certain degree of solids on the membrane surface is deposited deposition, or periodically the protective tube 4 by operating the cylinder 6, the separation film 5
の表面に付着したケーキ層を筒体41内の水流によって洗い流すことができ、ケーキ層の成長を抑制することができる。 Cake layer adhering to the surface of the can be washed away by the water flow in the cylinder body 41, you are possible to suppress the growth of the cake layer. このとき、膜面に対して平行な水流によって洗浄を行うので、分離膜5に強い力が加わることがなく、 At this time, since the cleaning by parallel flow to the film surface, without a strong force is applied to the separation membrane 5,
損傷を与えずに剥離効果を高めることができる。 It is possible to enhance the peeling effect, without damage. しかも、上下に通水部を有する保護筒4内に分離膜5を収納して一体的に上下動させるように形成したので、分離膜5の全体を水流と均等に接触させることができ、分離膜5の全体を均一に洗浄することができる。 Moreover, since the formed so as to vertically move integrally houses the separation membrane 5 into the protective cylinder 4 having water passage portion up and down, the entire separation membrane 5 can be evenly contacted with water, separated it can be uniformly cleaned the entire film 5.

【0016】このときのシリンダー6のストロークは、 [0016] The stroke of the cylinder 6 at this time,
通常、200mm程度とし、上下移動速度は85mm/ Normal, and about 200mm, up and down movement speed 85mm /
sec程度とすることが好ましい。 It is preferable that the order of sec. 上下移動速度を85 The up and down movement speed 85
mm/sec程度にすることにより、散気(エアスクラビング)に比べて5倍程度の強度を得ることができ、ケーキ層の剪断効果を大幅に高めることができる。 By about mm / sec, it is possible to obtain a strength of about 5 times that of air diffuser (air scrubbing), it is possible to enhance the shear effect of the cake layer significantly.

【0017】さらに、このときに逆洗や散気管8からの散気を併用することにより、膜面のケーキ層の剥離をより効果的に行うことができる。 Furthermore by combining the diffuser from backwash and aeration tube 8 in this case, it is possible to perform the separation of the cake layer the film surface more effective basis. 例えば、逆洗を行ってケーキ層を膜面から浮かせた状態にした後に保護筒4を上下動させることにより、ケーキ層を効率よく剥離でき、 For example, by vertically moving the protective tube 4 after the state floated cake layer from the membrane surface subjected to backwashing, it is peeled efficiently cake layer,
次いで散気を行うことにより、剥離したケーキ層を分離膜5から完全に取除いて保護筒4から流出させることができる。 Then by performing aeration, it is possible to flow out the detached cake layer from the protective tube 4 Thoroughly remove from the separation membrane 5.

【0018】これにより、従来の逆洗や散気による洗浄操作に比べてケーキ層の成長を確実に抑制することができるので、長期間にわたって所定の透過流束を維持することができ、薬液洗浄の実施回数を大幅に減らすことができる。 [0018] Thus, it is possible to reliably suppress the growth of the cake layer in comparison with the washing operation with the conventional backwashing or aeration, it is possible to maintain a predetermined flux over a long period of time, chemical cleaning it is possible to reduce the implementation times significantly. したがって、保護筒やシリンダー等の機械設備による設備コストの上昇及びシリンダー作動エネルギーの増加を招くとしても、運転維持管理の軽減により、トータルコストの低減が図れる。 Therefore, increase of equipment cost due to mechanical equipment protection drum and the cylinder, and the like, and even lead to an increase of the cylinder operating energy, the reduction of operating and maintenance, it can be reduced the total cost.

【0019】なお、保護筒や吊下げ枠の形状は、使用する分離膜に応じて適宜最適な形状を選択することができ、一つの吊下げ枠に保護筒を複数列取付けることもでき、シリンダーは、その能力に応じて複数本を使用することもできる。 [0019] The shape of the protective tube and the hanging frame can also be able to select the most suitable shape according to the separation membrane used, attach a plurality of rows a protective tube in one of the hanging frame, the cylinder It can also be used a plurality of in accordance with their capabilities. また、吊下げ枠及び保護筒の上下動を確実に行わせるため、固液分離槽内に適宜なガイド部材を設けることもできる。 Further, in order to reliably performed the vertical movement of the hanging frame and the protective tube can also be provided an appropriate guide member solid-liquid separation tank. さらに、シリンダー以外の駆動手段、例えばモーターとクランクとの組合わせ等を使用することも可能である。 Furthermore, driving means other than cylinders, it is also possible to use a combination like the motor and the crank.

【0020】 [0020]

【発明の効果】以上説明したように、本発明の浸漬型膜ろ過装置によれば、分離膜表面へのケーキ層の成長を抑制することができるとともに、成長したケーキ層の剥離も効果的に行うことができ、浸漬型膜ろ過装置における維持管理費の大幅な低減が図れる。 As explained in the foregoing, according to the submerged membrane filtration system of the present invention, it is possible to suppress the growth of the cake layer on the separation membrane surface, growth cake layer peeling effectively It can be performed, thereby a significant reduction in maintenance costs in the immersion type membrane filtering device.

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

【図1】 本発明の浸漬型膜ろ過装置の一形態例を示す断面図である。 1 is a cross-sectional view showing one embodiment of a submerged membrane filtration apparatus of the present invention.

【図2】 保護筒の一例を示す一部断面正面図である。 2 is a partial cross-sectional front view showing an example of the protective tube.

【図3】 吊下げ枠の一例を示す平面図である。 3 is a plan view showing an example of a hanging frame.

【符号の説明】 DESCRIPTION OF SYMBOLS

1…原水流入管、2…排水管、3…固液分離槽、4…保護筒、5…分離膜、6…シリンダー、7…保護筒吊下げ枠、8…散気管、9…分離液導出管、31…フレーム、 1 ... raw water inlet pipe, 2 ... drain pipe, 3 ... solid-liquid separation tank, 4 ... protecting cylinder, 5 ... separation membrane, 6 ... cylinder, 7 ... lower frame hanging protecting cylinder, 8 ... diffuser tube, 9 ... separation liquid deriving tube, 31 ... frame,
41…筒体、42…整束板、43…ステー縦棒、44… 41 ... tubular body, 42: Seitababan 43: stay vertical bar, 44 ...
ステー横棒、45…通水口、46…接着封止剤、47… Stay horizontal bar, 45 ... passing Mizuguchi, 46 ... adhesive sealant, 47 ...
Oリング、48…端板、61…ロッド、71…横枠、7 O-ring, 48 ... end plate, 61 ... rod 71 ... horizontal frame seven
2…縦枠 2 ... vertical frame

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Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 固液分離槽内に浸漬した分離膜によって固液分離を行う固液分離装置において、下端が開口し、 1. A solid-liquid separator for performing solid-liquid separation by a separation membrane was immersed in the solid-liquid separation tank, the lower end is opened,
    上部側面に通水口を有する保護筒内に分離膜を保持し、 The separation membrane is held in a protective tube having a passage Mizuguchi the upper side,
    該分離膜の膜内流路上端を保護筒上端に開口させて分離液導出管に接続するとともに、該保護筒の上端部を、固液分離槽に対して上下動可能に設けられた保護筒吊下げ枠に固定し、該保護筒吊下げ枠を上下に揺動させる駆動手段を前記固液分離槽の上部に設けたことを特徴とする浸漬型膜ろ過装置。 While connected to the separation liquid deriving pipe is opened in the protective tube upper intramembranous flow path end of the separation membrane, protecting cylinder the upper end of the protective tube, it is vertically movable with respect to the solid-liquid separation tank suspended and fixed to the lower frame, submerged membrane filtration apparatus, characterized in that the drive means for oscillating lower frame hanging the protective tube vertically provided on an upper portion of the solid-liquid separation tank.
  2. 【請求項2】 前記固液分離槽の底部に、散気管を備えていることを特徴とする請求項1記載の浸漬型膜ろ過装置。 Wherein the bottom of the solid-liquid separation tank, submerged membrane filtration apparatus according to claim 1, characterized in that it comprises a diffuser tube.
JP10372468A 1998-12-28 1998-12-28 Immersion type membrane filter device Pending JP2000189958A (en)

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