JP2001191071A - Operation method of membrane separator - Google Patents
Operation method of membrane separatorInfo
- Publication number
- JP2001191071A JP2001191071A JP2000002788A JP2000002788A JP2001191071A JP 2001191071 A JP2001191071 A JP 2001191071A JP 2000002788 A JP2000002788 A JP 2000002788A JP 2000002788 A JP2000002788 A JP 2000002788A JP 2001191071 A JP2001191071 A JP 2001191071A
- Authority
- JP
- Japan
- Prior art keywords
- membrane
- bag
- backwash
- water
- raw water
- 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.)
- Granted
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、精密濾過（ＭＦ）
膜分離装置、限外濾過（ＵＦ）膜分離装置、逆浸透（Ｒ
Ｏ）膜分離装置などの膜分離装置の運転方法に関する。
詳しくは高い膜濾過流束を安定に維持するための膜分離
装置の運転方法に関する。The present invention relates to microfiltration (MF)
Membrane separator, ultrafiltration (UF) membrane separator, reverse osmosis (R
O) A method for operating a membrane separation device such as a membrane separation device.
More specifically, the present invention relates to a method for operating a membrane separation device for stably maintaining a high membrane filtration flux.
【０００２】[0002]
【従来の技術】膜分離装置に用いられる膜モジュールと
して、集水管の外周に分離膜を巻回したスパイラル型膜
モジュールがある。2. Description of the Related Art As a membrane module used in a membrane separation apparatus, there is a spiral type membrane module in which a separation membrane is wound around a water collecting pipe.
【０００３】図６は従来のスパイラル型膜モジュールの
構造を示す一部分解斜視図である。FIG. 6 is a partially exploded perspective view showing the structure of a conventional spiral type membrane module.
【０００４】集水管１の外周に複数の袋状の分離膜２が
メッシュスペーサ３を介して巻回されている。A plurality of bag-shaped separation membranes 2 are wound around the outer periphery of a water collecting pipe 1 via a mesh spacer 3.
【０００５】集水管１には管内外を連通するスリット状
開口が穿設されている。分離膜２は袋状のものであり、
その中央部が集水管１をくるんでいる。この袋状分離膜
２の内部にはメッシュスペーサ等よりなる流路材４が挿
入されており、この袋状分離膜（袋状膜）２の内部が透
過水流路となっている。[0005] The water collecting pipe 1 is provided with a slit-shaped opening communicating with the inside and outside of the pipe. The separation membrane 2 has a bag shape,
The central part surrounds the water collection pipe 1. A channel material 4 made of a mesh spacer or the like is inserted inside the bag-shaped separation membrane 2, and the inside of the bag-shaped separation membrane (bag-shaped membrane) 2 is a permeated water channel.
【０００６】袋状膜２の巻回体５の両端にトップリング
６とエンドリング７とが設けられ、その外周にブライン
シール８が周設されている。[0006] A top ring 6 and an end ring 7 are provided at both ends of a wound body 5 of the bag-shaped membrane 2, and a brine seal 8 is provided around the outer periphery thereof.
【０００７】原水は、巻回体５の前端面から袋状膜２同
士の間の原水流路に流入し、そのまま巻回体５の長手方
向に流れ、巻回体５の後端面から濃縮水として流出す
る。この原水流路を流れる間に水が袋状膜２を透過して
その内部に入り、集水管１内に流入し、該集水管１の後
端側からモジュール外に取り出される。The raw water flows into the raw water flow path between the bag-like membranes 2 from the front end face of the wound body 5, flows in the longitudinal direction of the wound body 5 as it is, and concentrates from the rear end face of the wound body 5. Leaked as. While flowing through the raw water flow path, water permeates the bag-like membrane 2 and enters the inside thereof, flows into the water collecting pipe 1, and is taken out of the module from the rear end side of the water collecting pipe 1.
【０００８】上記従来のスパイラル型膜モジュールに
は、次のような解決すべき課題があった。 集水管１内の透過水流量を多くするためには該集水
管１を大径化する必要があるが、そのようにするとスパ
イラル型膜モジュールの径も大きくなってしまう。 袋状膜２内に透過してきた透過水は、該袋状膜２内
をスパイラル状に回りながら集水管１まで流れるため、
袋状膜２内の流通抵抗が大きい。しかも、袋状膜２内か
ら集水管１に流れ込む集水管スリット部付近での流通抵
抗も大きい。 原水流路を流れる原水流量は、下流側になるほど減
少する。（原水が濃縮される分だけ原水流量が減る。）
このため、原水流路下流域では原水流速が小さくなり、
汚れが付着し易くなる。The above-mentioned conventional spiral type membrane module has the following problems to be solved. In order to increase the flow rate of permeated water in the water collecting pipe 1, it is necessary to increase the diameter of the water collecting pipe 1, but in such a case, the diameter of the spiral type membrane module also becomes large. The permeated water that has permeated into the bag-shaped membrane 2 flows to the water collecting pipe 1 while spirally flowing through the bag-shaped membrane 2.
The flow resistance in the bag-like membrane 2 is large. Moreover, the flow resistance near the slit portion of the water collecting pipe flowing into the water collecting pipe 1 from the inside of the bag-shaped membrane 2 is large. The flow rate of the raw water flowing through the raw water flow path decreases toward the downstream side. (The flow rate of raw water decreases as much as the raw water is concentrated.)
For this reason, the raw water flow velocity is low in the downstream of the raw water flow path,
Dirt easily adheres.
【０００９】本発明者は、上記従来の問題点を解決し、
集水管が不要であり、透過水流通抵抗が小さいスパイラ
ル型膜モジュールとして、袋状膜をシャフトに巻回して
巻回体とし、該巻回体の一端面から原水が供給され、透
過水が巻回体の他端面から取り出されるようにしたスパ
イラル型膜モジュールを特開平１０−２７２３４２号等
にて提案している。The present inventor has solved the above conventional problems,
A water collecting pipe is unnecessary, and as a spiral membrane module having a small permeated water flow resistance, a bag-like membrane is wound around a shaft to form a wound body. Raw water is supplied from one end surface of the wound body, and the permeated water is wound. Japanese Patent Application Laid-Open No. H10-272342 proposes a spiral-type membrane module that can be taken out from the other end face of the rotator.
【００１０】図２〜５は同号公報に記載のスパイラル型
膜モジュールを示すものであり、図２（ａ）はスパイラ
ル型膜モジュールの袋状膜及び該袋状膜が巻き付けられ
るシャフトの斜視図、図２（ｂ），（ｃ）はそれぞれ図
２（ａ）のＢ−Ｂ線、Ｃ−Ｃ線に沿う断面図である。図
３はシャフトの周りに袋状膜を巻き付ける方法を示す断
面図、図４は巻回体とソケットとの係合関係を示す斜視
図、図５はスパイラル型膜モジュールの側面図である。FIGS. 2 to 5 show a spiral membrane module described in the same publication, and FIG. 2A is a perspective view of a bag-like membrane of a spiral membrane module and a shaft around which the bag-like membrane is wound. 2 (b) and 2 (c) are cross-sectional views taken along line BB and CC of FIG. 2 (a), respectively. 3 is a cross-sectional view showing a method of winding a bag-like membrane around a shaft, FIG. 4 is a perspective view showing an engagement relationship between a wound body and a socket, and FIG. 5 is a side view of a spiral membrane module.
【００１１】この袋状膜１０は、正方形又は長方形状の
ものであり、第１の辺部１１、第２の辺部１２、第３の
辺部１３及び第４の辺部１４を有している。この袋状膜
１０は、長い一枚の分離膜フィルムを第２の辺部１２の
部分で二つに折り返し、第１の辺部１１及び第３の辺部
１３において折り重なった分離膜フィルム同士を接着剤
等によって接着し、第４の辺部１４の一部については接
着を行うことなく開放部とした袋状のものである。The bag-like film 10 has a square or rectangular shape, and has a first side 11, a second side 12, a third side 13, and a fourth side 14. I have. This bag-shaped membrane 10 is formed by folding one long separation membrane film into two at the second side portion 12 and separating the separation membrane films folded at the first side portion 11 and the third side portion 13 from each other. The fourth side portion 14 is formed in a bag shape with an open portion without being bonded by an adhesive or the like.
【００１２】第４の辺部１４の途中から第３の辺部１３
にかけて袋状膜１０の分離膜フィルム同士が接着されて
おらず、透過水流出用の開放部３０となっている。ま
た、この第４の辺部１４の該途中から第１の辺部１１に
かけては、袋状膜１０の分離膜フィルム同士が接着され
ており、透過水の流出を阻止する閉鎖部３１となってい
る。From the middle of the fourth side portion 14 to the third side portion 13
The separation membrane films of the bag-like membrane 10 are not adhered to each other, and the opening portion 30 for permeated water outflow is formed. Further, from the middle of the fourth side portion 14 to the first side portion 11, the separation membrane films of the bag-like membrane 10 are adhered to each other, forming a closing portion 31 for preventing outflow of permeated water. I have.
【００１３】この袋状の膜１０内に透過水流路材（例え
ばメッシュスペーサ等よりなる。）１５が挿入配置され
ている。なお、袋状膜１０としては、長い一枚のフィル
ムを第２の辺部１２部分で二つに折り返したものに限ら
ず、二枚の分離膜フィルムを重ね合わせ、第１の辺部１
１、第２の辺部１２、第３の辺部１３及び第４の辺部１
４の一部を接着するようにしたものであっても良い。A permeated water flow path material (for example, made of a mesh spacer) 15 is inserted and arranged in the bag-like membrane 10. Note that the bag-shaped membrane 10 is not limited to a single long film folded in two at the second side 12, and two separation membrane films are overlapped to form the first side 1.
1, second side 12, third side 13, and fourth side 1
4 may be bonded.
【００１４】この袋状膜１０の一方の面には、接着剤１
６が付着されると共に他方の面には接着剤１７，１８が
付着され、この袋状膜１０がシャフト２０の周りに巻き
付けられる。接着剤１６は第１の辺部１１に沿って付着
され、接着剤１７は第３の辺部１３に沿って付着されて
いる。接着剤１８は第４の辺部１４の長手方向の前記途
中箇所から第３の辺部１３にかけて、透過水流出用の開
放部３０に沿って付着されている。On one surface of the bag-like film 10, an adhesive 1
6 is adhered and adhesives 17 and 18 are adhered to the other surface, and the bag-like film 10 is wound around the shaft 20. The adhesive 16 is applied along the first side 11, and the adhesive 17 is applied along the third side 13. The adhesive 18 is applied along the opening 30 for outflow of permeated water from the intermediate portion in the longitudinal direction of the fourth side portion 14 to the third side portion 13.
【００１５】複数枚の袋状膜１０をシャフト２０の周囲
に巻き付けることにより、重なり合った袋状膜１０同士
は接着剤１７，１８の部分において水密的に接合され
る。これにより、袋状膜１０，１０同士の間には原水
（及び濃縮水）が流れる原水流路が構成される。接着剤
１８が硬化することにより、巻回体の後端面には、内周
側に原水（濃縮水）の流出用の開放部が形成され、外周
側に原水流出阻止用の閉鎖部が形成される。By winding a plurality of bag-shaped membranes 10 around the shaft 20, the overlapping bag-shaped membranes 10 are joined to each other at the adhesives 17 and 18 in a water-tight manner. Thus, a raw water flow path through which raw water (and concentrated water) flows is formed between the bag-shaped membranes 10 and 10. As the adhesive 18 cures, an open portion for flowing out the raw water (concentrated water) is formed on the rear end surface of the wound body on the inner peripheral side, and a closing portion for preventing raw water outflow is formed on the outer peripheral side. You.
【００１６】第４の辺部１４のうち透過水流出用の開放
部３０と透過水流出阻止用の閉鎖部３１との境界部分か
ら、巻回体の後方に向ってフィン１９が延設されてい
る。このフィン１９は、例えば合成樹脂フィルム又はシ
ートよりなり、袋状膜１０に対し接着等により接合され
るのが好ましい。Fins 19 extend from the boundary between the open portion 30 for permeate outflow and the closed portion 31 for permeate outflow prevention in the fourth side portion 14 toward the rear of the wound body. I have. The fins 19 are made of, for example, a synthetic resin film or sheet, and are preferably bonded to the bag-like film 10 by adhesion or the like.
【００１７】袋状膜１０をシャフト２０の周りに図３の
如く原水流路材（メッシュスペーサ）２９を介して巻き
付けることにより、図４に示すように巻回体２４が形成
される。この巻回体２４の後端面からは、フィン１９が
延出する。各袋状膜１０の第４の辺部１４において同一
箇所にフィン１９を設けておくことにより、フィン１９
は巻回体２４の軸心から等半径位上に位置し、フィン１
９が重なり合うことによりフィン１９がリング状の突出
部を形成することになる。このリング状の突出部内に円
筒状のソケット２５の後端を挿入し、該ソケット２５と
フィン１９を接着剤等により接合する。なお、ソケット
２５をフィン１９に外嵌めしても良い。また、フィン１
９に沿って巻回体２４の後端面に旋盤で切込み溝を付
け、該溝にソケット２５の端部を埋め込むようにしても
良い。The wound body 24 is formed as shown in FIG. 4 by winding the bag-like membrane 10 around the shaft 20 via a raw water flow path material (mesh spacer) 29 as shown in FIG. The fin 19 extends from the rear end face of the wound body 24. By providing the fins 19 at the same location on the fourth side portion 14 of each bag-like film 10, the fins 19
Are located equiradially from the axis of the winding body 24 and
The fins 19 form a ring-shaped protrusion by overlapping the 9. The rear end of the cylindrical socket 25 is inserted into the ring-shaped protrusion, and the socket 25 and the fin 19 are joined with an adhesive or the like. Note that the socket 25 may be externally fitted to the fin 19. Also, fin 1
A cutting groove may be formed on the rear end face of the wound body 24 along the line 9 by a lathe, and the end of the socket 25 may be embedded in the groove.
【００１８】このようにソケット２５とフィン１９とを
接合することにより、巻回体２４の後端面の外周側の透
過水流出領域とソケット２５の内周側の濃縮水流出領域
とが区画される。By joining the socket 25 and the fins 19 in this manner, a permeated water outflow area on the outer peripheral side of the rear end face of the wound body 24 and a concentrated water outflow area on the inner peripheral side of the socket 25 are defined. .
【００１９】なお、袋状膜１０をシャフト２０の周りに
巻き付けるに際しては、図２に示すように、袋状膜１０
同士の間に原水流路材（メッシュスペーサ）２９を介在
させておく。これらのメッシュスペーサ２９を介在させ
ることにより、原水流路が構成される。When the bag-like film 10 is wound around the shaft 20, as shown in FIG.
A raw water flow path material (mesh spacer) 29 is interposed between them. The raw water flow path is formed by interposing these mesh spacers 29.
【００２０】図５に示すように、巻回体２４の前縁及び
後縁にそれぞれトップリング２６及びエンドリング２７
を合成樹脂モールド等により形成し、トップリング２６
の外周にブラインシール２８を周設する。As shown in FIG. 5, a top ring 26 and an end ring 27 are provided on the leading edge and the trailing edge of the wound body 24, respectively.
Is formed by a synthetic resin mold or the like, and the top ring 26 is formed.
A brine seal 28 is provided around the outer periphery of.
【００２１】このように構成されたスパイラル型膜モジ
ュールにおいては、図５に示すように、巻回体２４の前
端面から原水が袋状膜１０同士の間の原水流路に流入す
る。この原水は、巻回体２４の軸心線と略平行方向に原
水流路を流れ、巻回体２４の後端のソケット２５の内側
の端面から取り出される。そして、このように原水が原
水流路を流れる間に、水が袋状膜１０内に透過し、透過
水は巻回体２４の後端面のうちソケット２５の外周側か
ら流出する。In the spiral membrane module configured as described above, as shown in FIG. 5, raw water flows into the raw water flow path between the bag-like membranes 10 from the front end face of the wound body 24. This raw water flows through the raw water flow path in a direction substantially parallel to the axis of the wound body 24, and is taken out from the end face inside the socket 25 at the rear end of the wound body 24. Then, while the raw water flows through the raw water flow path, the water permeates into the bag-like membrane 10, and the permeated water flows out from the outer peripheral side of the socket 25 on the rear end surface of the wound body 24.
【００２２】このスパイラル型膜モジュールにあって
は、透過水が袋状膜１０内を巻回体２４の軸心線と平行
方向に流れて後端面から取り出されるため、従来のスパ
イラル型膜モジュールに用いられていた集水管が不要で
ある。このため、袋状膜から集水管内に流れ込む際の流
通抵抗が無くなり、透過水流通抵抗が著しく小さくな
る。In this spiral membrane module, the permeated water flows in the bag-like membrane 10 in a direction parallel to the axis of the wound body 24 and is taken out from the rear end face. The used collecting pipe is unnecessary. For this reason, the flow resistance when flowing from the bag-like membrane into the water collecting pipe is eliminated, and the permeated water flow resistance is significantly reduced.
【００２３】なお、集水管を省略しており、その分だけ
袋状膜１０の巻回方向の長さを大きくとることができ、
膜面積を大きくとることが可能である。袋状膜の巻回方
向の長さを大きくしても、透過水流通抵抗は増大せず、
透過水量を多くすることができる。The water collecting pipe is omitted, and the length of the bag-like membrane 10 in the winding direction can be increased accordingly.
It is possible to increase the film area. Even if the length of the bag-like membrane in the winding direction is increased, the permeated water flow resistance does not increase,
The amount of permeated water can be increased.
【００２４】このスパイラル型膜モジュールにあって
は、原水流路の出口部分をソケット２５の内側だけに設
けており、原水流路の出口（最下流部）を絞った構成と
しているため、原水流路の下流側においても原水（濃縮
水）の流速が十分に大きなものとなり、原水流路下流域
における汚れの付着を防止することができる。なお、ソ
ケット２５の内側の面積と外側の面積（接着剤１８の辺
部１４方向の長さ）は、このスパイラル型膜モジュール
の水回収率に応じて決めるのが好ましい。In this spiral type membrane module, the outlet portion of the raw water flow path is provided only inside the socket 25, and the outlet (most downstream portion) of the raw water flow path is narrowed. The flow rate of the raw water (concentrated water) becomes sufficiently large also on the downstream side of the road, and the adhesion of dirt in the downstream area of the raw water flow path can be prevented. The area inside and outside the socket 25 (the length of the adhesive 18 in the side portion 14 direction) is preferably determined according to the water recovery rate of the spiral membrane module.
【００２５】また、このスパイラル型膜モジュールにあ
っては、ソケット２５をフィン１９を用いて巻回体２４
に接続しており、ソケット２５と巻回体２４との接続強
度が高い。そして、このソケット２５によって原水の流
入側と濃縮水の流出側とが水密的に区画分離される。In this spiral type membrane module, the socket 25 is connected to the wound body 24 by using the fin 19.
And the connection strength between the socket 25 and the winding body 24 is high. Then, the inflow side of the raw water and the outflow side of the concentrated water are partitioned in a watertight manner by the socket 25.
【００２６】特開平１１−１６９６８４号公報には、こ
のスパイラル型膜モジュールの逆洗方法として、巻回体
内部に透過水が存在する状態で透過水側に逆洗用気体を
供給し、残存する透過水を逆洗させ、その後、残存透過
水が減少し気液混合状態を経て気体のみが流れるように
なるまで気体供給を継続する方法が開示されている。Japanese Patent Application Laid-Open No. 11-169684 discloses a method for backwashing the spiral membrane module, in which a backwash gas is supplied to the permeated water side in a state where permeated water is present inside the wound body and the spiral membrane module remains. A method is disclosed in which the permeated water is back-washed, and thereafter the gas supply is continued until the remaining permeated water decreases and only gas flows through a gas-liquid mixed state.
【００２７】また、特開平１１−１３７９７７号公報に
は、この膜モジュールを薬品（洗浄薬品溶液）で洗浄す
る装置が記載されている。Japanese Patent Application Laid-Open No. 11-137977 describes an apparatus for cleaning this membrane module with a chemical (cleaning chemical solution).
【００２８】ところで、一般に、膜分離装置の膜モジュ
ールは、通水運転により膜面に付着したＳＳ成分の除去
を短い間隔（例えば８分に１回）にて実施する空気逆洗
と長い間隔（例えば１ヶ月に１回）にて実施する薬品洗
浄で実施していた。In general, a membrane module of a membrane separation apparatus is provided with an air backwashing method in which SS components attached to a membrane surface are removed at a short interval (for example, once every 8 minutes) by a water flow operation and a long interval ( (For example, once a month).
【００２９】一般に、膜分離装置では、孔径が大きいほ
ど単位圧力当たりの膜濾過流束（以下換算フラックスと
記載する。）は、その運転初期には大きいものの、被処
理水中の微粒子が孔内に目詰まりしやすく急激に換算フ
ラックスは低下する。従って、孔径１μｍ以上の比較的
孔径の大きなＭＦ膜を用いた膜分離装置では、上記のよ
うな空気逆洗を実施しても高い膜濾過流束を安定に維持
することができず、薬品洗浄を頻繁に行う必要があっ
た。In general, in a membrane separation apparatus, the larger the pore size, the larger the membrane filtration flux per unit pressure (hereinafter referred to as converted flux), but the larger the fine particles in the water to be treated are in the pores. The converted flux is easily clogged and the conversion flux decreases rapidly. Therefore, a membrane separation apparatus using a MF membrane having a relatively large pore diameter of 1 μm or more cannot maintain a high membrane filtration flux stably even if the above-described air backwashing is performed, resulting in chemical cleaning. Had to be done frequently.
【００３０】この薬品洗浄は、薬剤コストがかかると共
に、排出される使用済みの薬品は、廃液処理が必要とな
る。This chemical cleaning requires a chemical cost, and the used chemical discharged needs to be treated with a waste liquid.
【００３１】[0031]
【発明が解決しようとする課題】本発明は、水による逆
洗だけで透過水量を十分に回復させることが可能な膜分
離装置の運転方法を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for operating a membrane separation apparatus capable of sufficiently recovering a permeated water amount only by backwashing with water.
【００３２】[0032]
【課題を解決するための手段】本発明の膜分離装置の運
転方法は、複数の膜モジュールを備えてなる膜分離装置
の運転方法において、一部の膜モジュールにおいて逆洗
を連続して複数回繰り返すことにより膜モジュールを洗
浄する本逆洗を行うと共に、該一部以外の膜モジュール
では原水を濾過する定常濾過運転を行うことを特徴とす
るものである。According to a method of operating a membrane separation apparatus of the present invention, a method of operating a membrane separation apparatus having a plurality of membrane modules is provided. It is characterized in that the main backwash for washing the membrane module is carried out by repeating the above, and for the other membrane modules, a steady filtration operation for filtering raw water is carried out.
【００３３】かかる膜分離装置の運転方法によると、本
逆洗により膜面の付着物をかなり高効率にて除去するこ
とができる。また、この本逆洗の間、他の膜モジュール
にて定常濾過運転を行うので、濾過水を安定して生産す
ることができると共に、逆洗排水を他の膜モジュールの
濾過排水原水に用いることができる。According to the operation method of the membrane separation apparatus, the adherence on the membrane surface can be removed at a considerably high efficiency by the main backwash. In addition, during the main backwash, a steady filtration operation is performed in another membrane module, so that filtered water can be stably produced, and the backwash wastewater is used as raw water for the filtered wastewater of another membrane module. Can be.
【００３４】なお、本発明では、この逆洗用の洗浄水と
しては膜モジュールの透過水を用いることが好ましい。
この透過水を逆流させるには、定常濾過運転中の膜モジ
ュールで得られた透過水の一部をタンクに溜めておき、
このタンクに気体圧を印加するのが好ましい。In the present invention, it is preferable to use the permeated water of the membrane module as the washing water for back washing.
In order to reverse this permeate, a part of the permeate obtained in the membrane module during the steady filtration operation is stored in a tank,
Preferably, gas pressure is applied to this tank.
【００３５】本逆洗における上記の本洗浄は、２〜２４
時間好ましくは６〜１２時間連続して行われることが好
ましい。In the main washing, the main washing is performed by 2 to 24
It is preferably performed continuously for 6 to 12 hours.
【００３６】この本逆洗は、１回の逆洗を好ましくは
０．５〜１０分、特に好ましくは０．８〜５分に一度の
割合で行い、これを連続して多数回（上記の通り、例え
ば２〜２４時間にわたって）繰り返す。In this main backwash, one backwash is preferably performed once every 0.5 to 10 minutes, particularly preferably once every 0.8 to 5 minutes. (E.g., over 2 to 24 hours).
【００３７】この１回の逆洗においては、水、好ましく
は透過水（濾過水）を好ましくは３〜１０秒、特に好ま
しくは３〜５秒にわたって逆流させる。この１回目の逆
洗時の逆流と２回目の逆洗時の逆流との間は、定常濾過
運転の膜モジュールで得られた透過水の一部をタンクに
溜め、あるいは透過水ヘッダーから逆流させることで次
回目の逆洗に用いる。In this one backwash, water, preferably permeated water (filtered water), is back-flowed for preferably 3 to 10 seconds, particularly preferably 3 to 5 seconds. Between the backflow at the time of the first backwash and the backflow at the time of the second backwash, a part of the permeated water obtained by the membrane module in the steady filtration operation is stored in a tank or is backflowed from the permeated water header. Use it for the next backwash.
【００３８】本発明では、複数の膜モジュールのうち一
部の膜モジュールで本逆洗を行っている間、他の膜モジ
ュールでは定常濾過運転を行う。In the present invention, while the main backwash is being performed in some of the plurality of membrane modules, a steady filtration operation is performed in other membrane modules.
【００３９】この定常濾過運転では、連続して濾過を行
う。ただし、間欠的に短時間の逆洗を行い、透過水の減
少あるいは透過差圧の上昇を抑制する。この短時間の逆
洗は、好ましくは２〜６０分、特に３〜３０分とりわけ
４〜１０分に１回の頻度で行われるのが好ましい。１回
の逆洗の所要時間は３〜１０秒程度特に３〜５秒程度が
好ましい。この逆洗は水のみで行ってもよいが、最初に
水逆洗を行い、その後空気などの気体を逆流させる気体
逆洗に移行してもよい。In this steady filtration operation, filtration is performed continuously. However, backwashing is performed intermittently for a short time to suppress a decrease in permeated water or an increase in permeation pressure difference. This short-time backwash is preferably performed once every 2 to 60 minutes, particularly preferably every 3 to 30 minutes, especially every 4 to 10 minutes. The time required for one backwash is preferably about 3 to 10 seconds, particularly preferably about 3 to 5 seconds. This backwash may be performed using only water, but the backwash may be performed first, and then the process may be shifted to gas backwash in which a gas such as air flows backward.
【００４０】各膜モジュールは定常濾過運転を所定時間
（例えば２〜２４時間特に好ましくは６〜１２時間）継
続した後、本逆洗を行うのが好ましいが、定常濾過運転
中に透過水量や透過差圧が十分には回復しないようにな
ったときに、適宜に本逆洗工程に移ってもよい。Each membrane module preferably performs the main backwashing after the continuous filtration operation is continued for a predetermined time (for example, 2 to 24 hours, particularly preferably 6 to 12 hours). When the differential pressure does not recover sufficiently, the process may be shifted to the backwashing step as appropriate.
【００４１】本発明の膜分離装置の運転方法は、上記の
特開平１０−２７２３４２号公報のスパイラル型膜モジ
ュール、即ち、袋状膜の内部に透過水流路材が配置さ
れ、袋状膜同士の間には原水流路材が配置されているス
パイラル型膜モジュールであって、該袋状膜は第１、第
２、第３及び第４の辺部を有した略方形であり、該第
１、第２及び第３の辺部は封じられ、該第４の辺部は一
部が開放部となり残部が閉鎖部となっており、前記第４
の辺部と直交する第１の辺部をシャフトに当てて袋状膜
を巻回して巻回体とし、前記第４の辺部を該巻回体の後
端面に臨ませ、該第４の辺部に対向する第２の辺部を該
巻回体の前端面に臨ませ、該袋状膜同士の間の原水流路
は、該第３の辺部の全体が封じられると共に、第４の辺
部にあっては前記袋状膜の開放部と重なる箇所が閉鎖部
となっており、且つ前記袋状膜の閉鎖部と重なる箇所が
開放部となっているものに特に好適に適用できる。The method of operating the membrane separation apparatus of the present invention is based on the spiral type membrane module disclosed in Japanese Patent Application Laid-Open No. 10-272342, that is, a permeated water channel material is arranged inside a bag-like membrane, and A spiral type membrane module in which a raw water flow path material is disposed therebetween, wherein the bag-shaped membrane has a substantially rectangular shape having first, second, third, and fourth sides. , The second and third sides are sealed, and the fourth side is partially open and the remainder closed.
A first side perpendicular to the side of the roll is applied to the shaft to wind the bag-like membrane to form a roll, and the fourth side faces the rear end face of the roll, and the fourth With the second side facing the side facing the front end face of the wound body, the raw water flow path between the bag-like membranes is entirely sealed with the third side, and the fourth side is closed. In the side part, the portion overlapping with the open portion of the bag-shaped membrane is a closed portion, and the portion overlapping with the closed portion of the bag-shaped membrane is an open portion. .
【００４２】このタイプのスパイラル型膜モジュール
は、繰り返し逆洗が施されても破損しにくく、また逆洗
が容易であり且つ逆洗により透過水量が回復し易い。A spiral type membrane module of this type is hardly damaged even when repeatedly subjected to backwashing, is easy to backwash, and the amount of permeated water is easily recovered by backwashing.
【００４３】本発明で用いる膜モジュールは、膜孔径が
１μｍ以上例えば１〜１００μｍ、特に２〜１０μｍと
りわけ２〜５μｍ程度のＭＦ膜モジュールが好ましい。
孔径が１μｍ未満の膜は、透過水量が少ない。As the membrane module used in the present invention, an MF membrane module having a membrane pore size of 1 μm or more, for example, about 1 to 100 μm, particularly about 2 to 10 μm, especially about 2 to 5 μm is preferable.
A membrane having a pore size of less than 1 μm has a small amount of permeated water.
【００４４】本発明では、原水としては井水、表流水、
工場排水などが例示されるが、これに限定されるもので
はない。In the present invention, the raw water is well water, surface water,
Although factory drainage etc. are illustrated, it is not limited to this.
【００４５】原水中に色度成分、フミン質、フミン状物
質などの除去すべき有機物質が含まれているときには、
無機凝集剤を添加してもよいが、通常は無機凝集剤の添
加は不要である。When raw water contains an organic substance to be removed such as a chromaticity component, humic substance, or humic substance,
Although an inorganic coagulant may be added, it is usually unnecessary to add an inorganic coagulant.
【００４６】[0046]
【発明の実施の形態】以下、図面を参照して実施の形態
について説明する。図１は本発明方法が適用される膜分
離装置の系統図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of a membrane separation apparatus to which the method of the present invention is applied.
【００４７】前記図２〜５の構造のスパイラル型膜モジ
ュール４０Ａ，４０Ｂが円筒状の耐圧ベッセル５０Ａ，
５０Ｂ内に収容されている。ベッセル５０Ａ，５０Ｂの
前端面の原水ポート５１Ａ，５１Ｂには、弁６１Ａ，６
１Ｂを有した原水ライン６０Ａ，６０Ｂを介して集合原
水ライン６０が接続されている。この弁６１Ａと原水ポ
ート５１Ａとの間の原水ライン６０Ａ及び、弁６１Ｂと
原水ポート５１Ｂとの間の原水ライン６０Ｂからは逆洗
排水取出ライン６２Ａ，６２Ｂがそれぞれ分岐し、該排
水取出ライン６２Ａ，６２Ｂに弁６３Ａ，６３Ｂが設け
られている。The spiral type membrane modules 40A and 40B having the structure shown in FIGS.
50B. The raw water ports 51A, 51B on the front end surfaces of the vessels 50A, 50B are provided with valves 61A, 6B.
The collecting raw water line 60 is connected via raw water lines 60A and 60B having 1B. A backwash drainage line 62A, 62B branches off from a raw water line 60A between the valve 61A and the raw water port 51A and a raw water line 60B between the valve 61B and the raw water port 51B, respectively. Valves 63A and 63B are provided in 62B.
【００４８】ベッセル５０Ａ，５０Ｂの後端面の中央の
濃縮水ポート５２Ａ，５２Ｂには前記ソケット２５が内
嵌している。この濃縮水ポート５２Ａ，５２Ｂには弁７
１Ａ，７１Ｂを有した濃縮水ライン７０Ａ，７０Ｂが接
続されている。The socket 25 is fitted inside the concentrated water ports 52A, 52B at the center of the rear end surfaces of the vessels 50A, 50B. The concentrated water ports 52A and 52B have a valve 7
Concentrated water lines 70A, 70B having 1A, 71B are connected.
【００４９】ベッセル５０Ａ，５０Ｂの後端面の周辺側
に位置する透過水ポート５３Ａ，５３Ｂにはタンク８１
Ａ，８１Ｂ及び弁８２Ａ，８２Ｂを有した透過水ライン
８０Ａ，８０Ｂが接続されている。また、タンク８１
Ａ，８１Ｂと、それよりも下流側の弁８２Ａ，８２Ｂと
の間の透過水ライン８０Ａ，８０Ｂには、逆洗用の気体
ライン８４Ａ，８４Ｂが接続されており、この気体ライ
ン８４Ａ，８４Ｂに弁８５Ａ，８５Ｂが設けられてい
る。気体ライン８４Ａ，８４Ｂは集合気体ライン８４を
介してコンプレッサ等の加圧空気源に連結されている。The tank 81 is connected to the permeated water ports 53A and 53B located on the peripheral side of the rear end surfaces of the vessels 50A and 50B.
A, 81B and permeated water lines 80A, 80B having valves 82A, 82B are connected. Also, the tank 81
A gas line 84A, 84B for backwashing is connected to the permeated water lines 80A, 80B between the valves A, 81B and the valves 82A, 82B downstream of the gas lines 84A, 84B. Valves 85A and 85B are provided. The gas lines 84A, 84B are connected to a source of pressurized air, such as a compressor, via a collecting gas line 84.
【００５０】本逆洗を膜モジュール４０Ａで行い、定常
膜濾過運転を膜モジュール４０Ｂで行っている場合に
は、本逆洗は以下の操作を連続して多数回繰り返すこと
によって行う。なお、本逆洗は好ましくは２〜２４時
間、特に好ましくは６〜１２時間継続して実施される。When the main backwash is performed by the membrane module 40A and the regular membrane filtration operation is performed by the membrane module 40B, the main backwash is performed by continuously repeating the following operation many times. The backwashing is preferably performed continuously for 2 to 24 hours, particularly preferably for 6 to 12 hours.
【００５１】 透過水タンクへの透過水の導入 弁６１Ａ，６３Ａ，７１Ａ，８５Ａを閉とし、弁８２Ａ
を開とし、定常膜濾過運転を行っている膜モジュール４
０Ｂで得られる膜透過水の少なくとも一部をタンク８１
Ａに溜める。本タンクの容量はベッセル５０Ａの容量と
同等以上、好ましくは同等より少し大きい程度とし、確
実に透過水が逆洗に供せられるようにする。Introduction of Permeated Water into Permeated Water Tank Valves 61A, 63A, 71A, 85A are closed and valve 82A
Is open and the membrane module 4 is performing a steady membrane filtration operation.
At least a portion of the membrane permeated water obtained in
Store in A. The capacity of the main tank is equal to or larger than the capacity of the vessel 50A, and preferably slightly larger than the capacity, so that the permeated water can be surely subjected to backwashing.
【００５２】 透過水の本逆洗膜モジュールへの導入
・排出 弁６１Ａ，７１Ａ，８２Ａを閉とし、弁６３Ａ，８５Ａ
を開とし、気体ライン８４に気体（空気、窒素など）を
供給する。この時の気体の供給圧は０．７ＭＰａ以上あ
ることが好ましい。これによりタンク８１Ａ内に逆流方
向に空気圧が加えられ、逆流水圧が透過水ポート５３
Ａ，ベッセル５０Ａ内の透過水室５４Ａを介してスパイ
ラル型膜モジュール４０Ａの袋状膜１０内の透過水流路
に伝播し、タンク８１Ａ，透過水室５４Ａ及び袋状膜１
０内の透過水が袋状膜１０同士の間の原水流路に流れ込
み、原水ポート５１Ａ及び逆洗排水取出ライン６２Ａを
介して流出する。逆洗排水取出ライン６２Ａより流出し
た逆洗排水の全量又は一部は図示しない原水タンクへと
返送される。Inlet / discharge of permeated water into the main backwash membrane module Valves 61A, 71A, 82A are closed and valves 63A, 85A
Is opened, and gas (air, nitrogen, etc.) is supplied to the gas line 84. At this time, the gas supply pressure is preferably 0.7 MPa or more. As a result, air pressure is applied to the tank 81A in the reverse flow direction, and the reverse flow water pressure increases
A, propagates through the permeated water chamber 54A in the vessel 50A to the permeated water flow path in the bag-shaped membrane 10 of the spiral type membrane module 40A, and the tank 81A, the permeated water chamber 54A and the bag-shaped membrane 1
The permeated water in 0 flows into the raw water flow path between the bag-shaped membranes 10, and flows out through the raw water port 51A and the backwash drainage extraction line 62A. All or part of the backwash wastewater flowing out of the backwash wastewater discharge line 62A is returned to a raw water tank (not shown).
【００５３】 休止 弁６１Ａ，６３Ａ，７１Ａ，８２Ａ，８５Ａを閉とし、
膜モジュール４０Ａの運転を停止する。本工程は上記
の工程の次に行っても、上記と間に行っても良い。
又、本工程は無くても特に差し支えない。The stop valves 61 A, 63 A, 71 A, 82 A, 85 A are closed,
The operation of the membrane module 40A is stopped. This step may be performed after the above step or between the above steps.
In addition, there is no particular problem even if this step is not performed.
【００５４】膜モジュール４０Ａを本逆洗している間、
膜モジュール４０Ｂは定常濾過運転を行うが、この定常
濾過運転は通常の膜濾過運転で用いられている運転方法
を実施する。例えば、以下，の工程を繰り返し行う
ことによって実施される。During the main backwash of the membrane module 40A,
The membrane module 40B performs a steady filtration operation, and this steady filtration operation implements an operation method used in a normal membrane filtration operation. For example, it is performed by repeating the following steps.
【００５５】 通水 弁６３Ｂ，８５Ｂを閉とし、弁６１Ｂ，７１Ｂ，８２Ｂ
を開とする。原水は原水ポート５１Ｂからベッセル５０
Ｂ内に供給され、濃縮水はソケット２５，ポート５２Ｂ
及び濃縮水ライン７０Ｂを介して流出し、透過水はベッ
セル５０Ｂ内の後部側の透過水室５４Ｂから透過水ポー
ト５３Ｂ及び透過水ライン８０Ｂを介して取り出され
る。[0055] The valves 63B and 85B are closed, and the valves 61B, 71B and 82B are closed.
Open. Raw water is supplied from the raw water port 51B to the vessel 50.
B, and the concentrated water is supplied to socket 25 and port 52B.
Then, the permeated water flows out through the concentrated water line 70B, and is taken out from the permeated water chamber 54B on the rear side in the vessel 50B through the permeated water port 53B and the permeated water line 80B.
【００５６】 逆洗 弁６１Ｂ，７１Ｂ，８２Ｂを閉とし、弁６３Ｂ，８５Ｂ
を開とし、気体ライン８４に気体（空気、窒素など）を
供給する。これによりタンク８１Ｂ内に逆流方向に空気
圧が加えられ、逆流水圧が透過水ポート５３Ｂ，ベッセ
ル５０Ｂ内の透過水室５４Ｂを介してスパイラル型膜モ
ジュール４０Ｂの袋状膜１０内の透過水流路に伝播し、
タンク８１Ｂ，透過水室５４Ｂ及び袋状膜１０内の透過
水が袋状膜１０同士の間の原水流路に流れ込み、原水ポ
ート５１Ｂ及び逆洗排水取出ライン６２Ｂを介して流出
する。The backwash valves 61B, 71B, 82B are closed, and the valves 63B, 85B
Is opened, and gas (air, nitrogen, etc.) is supplied to the gas line 84. As a result, air pressure is applied to the tank 81B in the backward flow direction, and the backflow water pressure propagates through the permeate port 53B and the permeate chamber 54B in the vessel 50B to the permeate flow path in the bag-shaped membrane 10 of the spiral type membrane module 40B. And
The permeated water in the tank 81B, the permeated water chamber 54B and the bag-like membrane 10 flows into the raw water flow path between the bag-like membranes 10, and flows out through the raw water port 51B and the backwash drainage extraction line 62B.
【００５７】なお、逆洗効率を高めるためには、膜モジ
ュール４０Ａ，４０Ｂをシャフト軸心方向が上下方向と
なるように縦置きするのが好ましい。In order to increase the backwashing efficiency, it is preferable that the membrane modules 40A and 40B are vertically arranged so that the axial direction of the shaft is the vertical direction.
【００５８】上記実施の形態においては、ソケット２５
の外周側に透過水流出部を配置し、ソケット２５の内側
に濃縮水流出部を配置しているが、逆にソケット２５の
内側を透過水流出部とし、ソケット２５の外周側を濃縮
水流出部とするように構成しても良い。In the above embodiment, the socket 25
A permeated water outflow portion is arranged on the outer peripheral side of the socket 25, and a concentrated water outflow portion is arranged inside the socket 25. Conversely, the inside of the socket 25 is used as the permeated water outflow portion, and the outer peripheral side of the socket 25 is concentrated water outflow It may be configured to be a part.
【００５９】なお、本発明の好適な洗浄条件について次
に説明する。 (1) タンク８１Ａ，８１Ｂの容積は膜モジュールの容
積と同等以上、好ましくは同等よりも少し大きい程度と
し、十分に逆洗を行うようにする。 (2) 逆洗排水は全量又は５０％以上原水槽（図示略）
に流入させ、回収率を高める。 (3) 逆洗の際の加圧気体圧は大気圧よりも０．７ＭＰ
ａ以上高いことが好ましい。The preferred cleaning conditions of the present invention will be described below. (1) The capacity of the tanks 81A and 81B is equal to or larger than the capacity of the membrane module, and is preferably slightly larger than the capacity of the membrane module, and sufficient backwashing is performed. (2) Backwash drainage is raw water tank or not less than 50% (not shown)
To increase the recovery rate. (3) Pressurized gas pressure during backwashing is 0.7MPa than atmospheric pressure
It is preferably higher than a.
【００６０】なお、本発明は図２〜５の膜モジュール以
外の膜モジュールを備えた膜分離装置の洗浄にも適用で
きる。また、膜モジュールを３基以上並列に設けてもよ
い。The present invention can be applied to the cleaning of a membrane separation apparatus provided with a membrane module other than the membrane modules shown in FIGS. Further, three or more membrane modules may be provided in parallel.
【００６１】[0061]
【実施例】以下に実施例を挙げて本発明をより具体的に
説明する。The present invention will be described more specifically with reference to the following examples.
【００６２】実施例１ 図１において、膜モジュール４０Ａ，４０Ｂとして孔径
３μｍのＰＴＦＥ製のＭＦ膜モジュールを用いた。膜面
積は２．８ｍ２である。原水としてはＳＳ５〜１０ｐｐ
ｍの井水を用いた。Example 1 In FIG. 1, an MF membrane module made of PTFE having a pore diameter of 3 μm was used as the membrane modules 40A and 40B. The film area is 2.8 m 2 . SS5-10pp for raw water
m of well water was used.
【００６３】定常濾過運転期間にあっては、４分毎に短
時間の逆洗として２０秒の逆洗を１回だけ行った。この
２０秒の逆洗の間に１０Ｌの水が逆流した。In the period of the steady filtration operation, backwashing for 20 seconds was performed only once every 4 minutes as a short-time backwash. During this 20 second backwash, 10 L of water flowed back.
【００６４】定常濾過運転を６時間継続した後、本逆洗
を６時間行った。この本逆洗にあっては、（３０秒間に
わたって１０Ｌの水を逆流）を１サイクルとし、これを
連続して６時間繰り返した。これにより３０日間、薬品
洗浄なしに濾過運転を続行できた。After the continuous filtration operation was continued for 6 hours, the main backwash was performed for 6 hours. In this main backwash, (10 L of water was flowed backward for 30 seconds) was defined as one cycle, and this was repeated continuously for 6 hours. This allowed the filtration operation to be continued for 30 days without chemical cleaning.
【００６５】この間の運転の結果（日平均）は次の通り
であった。 原水量 ８６．８ｍ３／ｄ 短時間逆洗排水量 ３．６ｍ３／ｄ 本逆洗排水量 ２８．８ｍ３／ｄ（全量回収） 生産水量 ８３．２ｍ３／ｄ 回収率 ９５．９％The results of the operation during this period (daily average) were as follows. Raw water amount 86.8 m 3 / d Short-time backwash drainage amount 3.6 m 3 / d Main backwash drainage amount 28.8 m 3 / d (collection of total amount) Produced water amount 83.2 m 3 / d Recovery rate 95.9%
【００６６】[0066]
【発明の効果】以上の通り、本発明によると膜分離装置
の透過水量を水逆洗だけで十分に回復させることができ
る。このため、洗浄コストを著しく低減することができ
る。As described above, according to the present invention, the amount of permeated water in the membrane separation device can be sufficiently recovered only by backwashing with water. Therefore, the cleaning cost can be significantly reduced.
【図１】実施の形態に係る膜モジュールの洗浄方法を示
す通水系統図である。FIG. 1 is a flow diagram showing a method for cleaning a membrane module according to an embodiment.
【図２】（ａ）図はスパイラル型膜モジュールの袋状膜
の斜視図、（ｂ）図は（ａ）図のＢ−Ｂ線に沿う断面
図、（ｃ）図は（ａ）図のＣ−Ｃ線に沿う断面図であ
る。2A is a perspective view of a bag-shaped membrane of a spiral membrane module, FIG. 2B is a cross-sectional view taken along the line BB of FIG. 2A, and FIG. 2C is a view of FIG. It is sectional drawing which follows CC line.
【図３】図２のスパイラル型膜モジュールの袋状膜の巻
き付け方法を示す断面図である。FIG. 3 is a cross-sectional view illustrating a method of winding a bag-shaped membrane of the spiral-wound membrane module of FIG. 2;
【図４】図２の膜モジュールの巻回体とソケットとの係
合関係を示す斜視図である。FIG. 4 is a perspective view showing an engagement relationship between a wound body and a socket of the membrane module of FIG. 2;
【図５】図２のスパイラル型膜モジュールの側面図であ
る。FIG. 5 is a side view of the spiral membrane module of FIG. 2;
【図６】従来のスパイラル型膜モジュールの構造を示す
一部分解斜視図である。FIG. 6 is a partially exploded perspective view showing the structure of a conventional spiral type membrane module.
１０ 袋状膜 １１ 第１の辺部 １２ 第２の辺部 １３ 第３の辺部 １４ 第４の辺部 １５ 流路材 １６，１７，１８ 接着剤 １９ フィン ２０ シャフト ２４ 巻回体 ２５ ソケット ２９ メッシュスペーサ ３０ 透過水流出用の開放部 ３１ 透過水流出阻止用の閉鎖部 ４０Ａ，４０Ｂ スパイラル型膜モジュール ５０Ａ，５０Ｂ ベッセル ６０Ａ，６０Ｂ 原水ライン ６２Ａ，６２Ｂ 逆洗排水取出ライン ７０Ａ，７０Ｂ 濃縮水ライン ８０Ａ，８０Ｂ 透過水ライン ８４ 気体ライン Reference Signs List 10 bag-like membrane 11 first side 12 second side 13 third side 14 fourth side 15 flow path material 16, 17, 18 adhesive 19 fin 20 shaft 24 wound body 25 socket 29 Mesh spacer 30 Open part for permeated water outflow 31 Closed part for permeated water outflow prevention 40A, 40B Spiral type membrane module 50A, 50B Vessel 60A, 60B Raw water line 62A, 62B Backwash drainage extraction line 70A, 70B Concentrated water line 80A , 80B Permeated water line 84 Gas line
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4D006 GA03 GA06 GA07 HA62 JA02A JA06A JA18A JA22A JA67B JB04 KA12 KA63 KA67 KC03 KC13 KC14 KE01Q KE02P KE03P KE05Q KE06Q KE12P KE22Q KE24R KE28R KE30P MA03 MA22 MC30X PA01 PB04 PB05 PB08 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D006 GA03 GA06 GA07 HA62 JA02A JA06A JA18A JA22A JA67B JB04 KA12 KA63 KA67 KC03 KC13 KC14 KE01Q KE02P KE03P KE05Q KE06Q KE12P KE22Q KE24R30X03 MAKE
Claims (7)
装置の運転方法において、 一部の膜モジュールの逆洗を連続して複数回繰り返すこ
とにより膜モジュールを洗浄する本逆洗を行うと共に、 他の膜モジュールでは原水を濾過する定常濾過運転を行
うことを特徴とする膜分離装置の運転方法。1. A method of operating a membrane separation device comprising a plurality of membrane modules, wherein a main backwash for washing the membrane modules by repeating backwashing of some of the membrane modules continuously plural times is performed, A method for operating a membrane separation device, wherein a constant filtration operation for filtering raw water is performed in another membrane module.
モジュールの透過水側から原水側へ洗浄水を逆流させる
ものであり、この洗浄水は膜モジュールの透過水であ
り、逆流を気体圧の印加によって行うことを特徴とする
膜分離装置の運転方法。2. The backwash according to claim 1, wherein the backwash is a backflow of the wash water from the permeated water side of the membrane module to the raw water side, and the wash water is the permeated water of the membrane module. Is performed by applying a gas pressure.
は２〜２４時間継続して実行されるものであり、この間
に逆洗が連続して繰り返し行われることを特徴とする膜
分離装置の運転方法。3. The membrane separation according to claim 1, wherein the main backwash is performed continuously for 2 to 24 hours, and during this time, the backwash is continuously and repeatedly performed. How to operate the device.
て、前記本逆洗の逆洗排水を定常濾過運転時の原水とす
ることを特徴とする膜分離装置の運転方法。4. The method for operating a membrane separation device according to claim 1, wherein the backwash wastewater of the main backwash is used as raw water in a steady filtration operation.
て、前記定常濾過運転は、濾過の途中で短時間の逆洗を
行う運転であることを特徴とする膜分離装置の運転方
法。5. The method for operating a membrane separation apparatus according to claim 1, wherein the steady-state filtration operation is an operation of performing a short-time backwash during the filtration.
て、該膜モジュールは、袋状膜の内部に透過水流路材が
配置され、袋状膜同士の間には原水流路材が配置されて
いるスパイラル型膜モジュールであって、 該袋状膜は第１、第２、第３及び第４の辺部を有した略
方形であり、該第１、第２及び第３の辺部は封じられ、
該第４の辺部は一部が開放部となり残部が閉鎖部となっ
ており、 前記第４の辺部と直交する第１の辺部をシャフトに当て
て袋状膜を巻回して巻回体とし、前記第４の辺部を該巻
回体の後端面に臨ませ、該第４の辺部に対向する第２の
辺部を該巻回体の前端面に臨ませ、 該袋状膜同士の間の原水流路は、該第３の辺部の全体が
封じられると共に、第４の辺部にあっては前記袋状膜の
開放部と重なる箇所が閉鎖部となっており、且つ前記袋
状膜の閉鎖部と重なる箇所が開放部となっているスパイ
ラル型膜モジュールであることを特徴とする膜分離装置
の運転方法。6. The membrane module according to claim 1, wherein the permeated water flow path material is disposed inside the bag-shaped membrane, and the raw water flow path material is disposed between the bag-shaped membranes. Wherein the bag-shaped membrane is a substantially rectangular shape having first, second, third and fourth sides, and wherein the first, second and third sides are provided. Is sealed,
A part of the fourth side is an open part and the remaining part is a closed part, and a first side perpendicular to the fourth side is applied to a shaft to wind a bag-like membrane. A body having a fourth side facing the rear end face of the wound body, a second side facing the fourth side facing the front end face of the wound body, In the raw water flow path between the membranes, the entire third side portion is sealed, and in the fourth side portion, a portion overlapping with the open portion of the bag-shaped membrane is a closed portion, A method of operating a membrane separation device, wherein the bag-type membrane is a spiral-type membrane module in which a portion overlapping with a closed portion is an open portion.
て、該膜モジュールは孔径１μｍ以上のＭＦ膜であるこ
とを特徴とする膜分離装置の運転方法。7. The method for operating a membrane separation apparatus according to claim 1, wherein the membrane module is an MF membrane having a pore size of 1 μm or more.
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|---|---|---|---|
| JP2000002788A JP3659106B2 (en) | 2000-01-11 | 2000-01-11 | Operation method of membrane separator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000002788A JP3659106B2 (en) | 2000-01-11 | 2000-01-11 | Operation method of membrane separator |
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| JP3659106B2 JP3659106B2 (en) | 2005-06-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003022750A1 (en) * | 2001-09-05 | 2003-03-20 | Mitsubishi Rayon Co., Ltd. | Water purification cartridge, water purifier, and method of cleaning water purifier |
| JP2010137185A (en) * | 2008-12-12 | 2010-06-24 | Suido Kiko Kaisha Ltd | Operation method of multi-stage type membrane filtering system |
| WO2014129340A1 (en) | 2013-02-25 | 2014-08-28 | 三菱重工業株式会社 | Reverse osmosis membrane device and method for operating same |
| US20160205959A1 (en) * | 2013-08-29 | 2016-07-21 | Meiji Co., Ltd. | Production method for concentrated product using membrane-concentration method and freeze-concentration method |
-
2000
- 2000-01-11 JP JP2000002788A patent/JP3659106B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003022750A1 (en) * | 2001-09-05 | 2003-03-20 | Mitsubishi Rayon Co., Ltd. | Water purification cartridge, water purifier, and method of cleaning water purifier |
| KR100862105B1 (en) * | 2001-09-05 | 2008-10-09 | 미쯔비시 레이온 가부시끼가이샤 | Water purification cartridge and water purifier |
| KR100905346B1 (en) * | 2001-09-05 | 2009-07-01 | 미쯔비시 레이온 가부시끼가이샤 | Method for cleaning water purifier |
| KR100906031B1 (en) * | 2001-09-05 | 2009-07-02 | 미쯔비시 레이온 가부시끼가이샤 | Water purifier |
| JP2010137185A (en) * | 2008-12-12 | 2010-06-24 | Suido Kiko Kaisha Ltd | Operation method of multi-stage type membrane filtering system |
| WO2014129340A1 (en) | 2013-02-25 | 2014-08-28 | 三菱重工業株式会社 | Reverse osmosis membrane device and method for operating same |
| US10202291B2 (en) | 2013-02-25 | 2019-02-12 | Mitsubishi Heavy Industries Engineering, Ltd. | Reverse osmosis membrane apparatus and method of operating same |
| US20160205959A1 (en) * | 2013-08-29 | 2016-07-21 | Meiji Co., Ltd. | Production method for concentrated product using membrane-concentration method and freeze-concentration method |
| US9913484B2 (en) * | 2013-08-29 | 2018-03-13 | Meiji Co., Ltd. | Production method for concentrated product using membrane-concentration method and freeze-concentration method |
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|---|---|
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