JP2000070684A - Backwashing of pleated membrane filter - Google Patents

Backwashing of pleated membrane filter

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Publication number
JP2000070684A
JP2000070684A JP10242027A JP24202798A JP2000070684A JP 2000070684 A JP2000070684 A JP 2000070684A JP 10242027 A JP10242027 A JP 10242027A JP 24202798 A JP24202798 A JP 24202798A JP 2000070684 A JP2000070684 A JP 2000070684A
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Prior art keywords
water
backwash
level
pressure
backwashing
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JP10242027A
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Japanese (ja)
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Yasukiyo Sato
泰清 佐藤
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Japan Organo Co Ltd
オルガノ株式会社
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Priority to JP10242027A priority Critical patent/JP2000070684A/en
Publication of JP2000070684A publication Critical patent/JP2000070684A/en
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Abstract

PROBLEM TO BE SOLVED: To enhance backwashing efficiency than before. SOLUTION: After the water level at the start time of backwashing of the backwashing water in the filter water chamber 1b of a tower main body 1 and the pressure of a compressed air bed are set to predetermined values, the on-off valve 3a of a drain pipe 3 is opened to perform backwashing. Since the pressure of the compressed air bed is set to pressure proper to a pleated membrane filter 2 and both of the water level of the backwashing water in the filter water chamber 1b at the start time of backwashing and the pressure of the compressed air bed are preset to predetermined values to perform backwashing, if these predetermined values are set to values capable of expecting effective backwashing, the balance of backwashing water quantity and backwashing flow velocity can be properly taken.

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、一般産業復水、上工水、工場排水、発電用水、ボイラ復水等のろ過に用いられるプリーツ膜フィルタの逆洗方法に関する。 The present invention relates generally industrial condensate, Uekosui, industrial wastewater, power water, to backwash method pleated membrane filter used for filtration of boiler condensate water.

【0002】 [0002]

【従来の技術】プリーツ膜フィルタは、原則的には使い捨てで用いられるもので、逆洗による差圧の回復性は設計上意図されておらず、通水差圧の限界が到来した時点で、交換するよう用いられている。 BACKGROUND ART pleated membrane filter, in principle intended to be used in disposable, differential pressure recovery due to backwashing is not intended by design, when the limit of passing water bottle pressure is reached, It has been used to replace. しかしながら、通水差圧の限界が到来したとしても、各発電所等で数百〜千数百本単位で用いられているプリーツ膜フィルタの新品を準備するには、相応の準備期間が必要である。 However, even the limit of passing water bottle pressure has come, to prepare the new pleated membrane filter used in several hundred to one thousand and several hundred present units in each power plant or the like, requires a preparation period corresponding is there. このため、プリーツ膜フィルタにおいても、この新品の準備期間に相当する期間程度の延命を図るため、逆洗が行われている。 Therefore, even in the pleated membrane filter, in order to prolong the order period corresponding to the preparation period of the new, backwashing it is performed.

【0003】この逆洗手段としては、一般に、円筒形で、外側から内側に被処理水を通過させてろ過する点でプリーツ膜フィルタと共通し、プリーツ膜フィルタが普及する前に多用されていたもので、セルロース系ろ過助剤が表面にコーティングされたプレコートフィルタに用いられていた手段が採用されている。 [0003] The backwashing means, generally cylindrical, in common that is filtered through the treated water from the outside to the inside and pleated membrane filter, has been frequently used before pleated membrane filter is spread those with the means cellulosic filter aid has been used in the precoat filter coated on the surface is employed.

【0004】すなわち、図5に示したように、まず、通水を停止し、上部の空気抜き弁11と下部のドレン弁1 [0004] That is, as shown in FIG. 5, first, to stop the water flow, the upper portion of the purge valve 11 and the lower portion of the drain valve 1
2を開き、塔本体10内の水をすべて排出し、完全に排出された時点でこれらの弁11,12を閉じる(図5 Open 2 was discharged all the water in the tower body 10, closing the valves 11 and 12 when it is completely discharged (Fig. 5
(a))。 (A)). 次に、ポンプ14を起動して塔本体10の下部より逆洗水を圧入して、水面を上昇させ、塔本体10 Then, by press-fitting the backwash water from the lower portion of the column body 10 to start the pump 14, to increase the water surface, the tower body 10
内の空気層を圧縮し、目板10aを境として上部に形成されているろ過水室10bの上部に圧縮空気層を形成する(図5(b),(c))。 Compressing the air layer of the inner, forming an upper compressed air layer of filtration water chamber 10b formed in the upper as boundary batten 10a (FIG. 5 (b), (c)). 次に、ドレン弁12を開き、圧縮空気層の膨張作用を利用して、ろ過水の水位を急速に押し下げ、プレコートフィルタ13の内側から外側へと逆洗水を急速に流出させて逆洗する(図5 Next, open the drain valve 12, by utilizing the expansion action of the compressed air layer, rapidly depress the level of the filtered water, backwashed with the inside of the precoat filter 13 rapidly drained backwash water to the outside (Figure 5
(d))。 (D)).

【0005】 [0005]

【発明が解決しようとする課題】ところで、このようにして圧縮空気層を形成した場合には、塔本体10内に水が全くない状態から逆洗水を圧入するため、その圧力をかなり高くすることができる。 [SUMMARY OF THE INVENTION Incidentally, in the case of forming the thus compressed air layer in order to press-fit the backwash water from the situation that there is no water in the tower body 10, is much higher this pressure be able to. プレコートフィルタの場合には、主要部が厚肉のセラミック製あるいはカーボン製の素材から構成されているため、十分な耐圧強度を有しており、圧縮空気層の圧力が高くても逆洗によりエレメントが損傷することもない。 Since in the case of the precoat filter is the main part consists of ceramic or carbon steel material thick, has sufficient pressure resistance, the element by backwashing even at high pressure of the compressed air layer but nor does it damage. また、プレコートしたろ過助剤を剥離するのが逆洗の目的であるため、できるだけ大きな初期空気圧をもってこのろ過助剤を剥離することが好ましい。 Further, since peeling off the filter aid precoated is backwashing purposes, it is preferable to peel the filter aid with the largest possible initial air pressure.

【0006】しかしながら、プリーツ膜フィルタの場合には、ろ過膜がプリーツ型に形成した合成樹脂製の不織布からなり、懸濁物がこの不織布に付着しているため、 However, in the case of the pleated membrane filter is made of a filtration membrane was formed in a pleated synthetic resin nonwoven fabric, since the suspension is attached to the nonwoven fabric,
懸濁物を剥離することが困難な構造で、複数回の逆洗を行う必要がある。 A difficult structure to be peeled off the suspension, it is necessary to backwash the plurality of times. また、合成樹脂製のろ過膜である不織布が、合成樹脂製のネットあるいは多孔板で被覆されて保持されているため、耐圧強度が基本的にそれほど高くない。 Further, the nonwoven fabric is a filtration membrane made of a synthetic resin, since it is held by being covered with a synthetic resin net or a porous plate, pressure resistance is not high essentially so.

【0007】従って、上記したプレコートフィルタで採用されている逆洗手段をプリーツ膜フィルタに適用するに当たっては、プリーツ膜フィルタの耐圧強度を考慮して、塔本体内に形成される圧縮空気層の圧力を所定値以下(通常、4kgf/cm 2以下)に制御して行っている。 Accordingly, in applying the backwashing means which is employed in precoat filter as described above to pleated membrane filter, in consideration of the pressure resistance of the pleated membrane filter, the pressure of the compressed air layer formed in the column body It is performed by controlling the a predetermined value or less (typically, 4 kgf / cm 2 or less). すなわち、圧縮空気層の圧力が所定値に至った時点で逆洗水の圧入を停止している。 That is, the pressure of the compressed air layer is stopped press-fitting of the backwash water when it reaches a predetermined value.

【0008】しかしながら、圧縮空気層の圧力が所定値に至ったことのみを基準として、逆洗水の圧入を停止すると、逆洗のために機能する逆洗水が目板上のろ過水室内に保有されている逆洗水のみであるところ、この実質的な逆洗水の量が設定圧力に応じて少なくなり、十分な逆洗を行うことができない。 However, based on only the pressure of the compressed air layer has reached the predetermined value, stopping the injection of backwash water, the filtered water chamber on backwash water batten that function for backwashing where only backwash water are held, the amount of substantial backwash water is reduced in accordance with the set pressure, it is impossible to perform sufficient backwash.

【0009】本発明は、上記に鑑みなされたものであり、ろ過水室内に形成される圧縮空気層の圧力をプリーツ膜フィルタに見合った値に設定しつつも、従来よりも、効果的な逆洗を行うことができるプリーツ膜フィルタの逆洗方法を提供することを課題とする。 [0009] The present invention has been made in view of the above, while still set to a value commensurate with the pleated membrane filter the pressure of the compressed air layer formed in the filtered water chamber, than conventional, effective reverse and to provide a backwash method of pleated membrane filter capable of performing washing.

【0010】 [0010]

【課題を解決するための手段】上記課題を解決するため、請求項1記載のプリーツ膜フィルタの逆洗方法は、 To solve the above object, according to an aspect of backwash method of pleated membrane filter according to claim 1, wherein the
塔本体内に設けられる目板に支持されて配設されたプリーツ膜フィルタに対し、目板を境に上部に形成されるろ過水室内に圧縮空気層を形成し、該圧縮空気層の膨張作用により、逆洗水の水位を急速に押し下げ、該逆洗水をプリーツ膜フィルタの内側から外側へと流出させることにより逆洗を行うプリーツ膜フィルタの逆洗方法において、ろ過水室内における逆洗水の逆洗開始時の水位と圧縮空気層の圧力とを所定値に設定して行うことを特徴とする。 To pleated membrane filter is supported by a batten provided in the column body is disposed to form a compressed air layer is filtered water chamber formed in the upper bordering the batten, the expansion action of the compressed air layer by rapidly depress the water level of the backwash water, the backwash process of pleated membrane filter for backwashing by flows out to the outside of the backwash water from inside of the pleated membrane filter backwash water in the filtered water chamber and performing a backwash starting level of the pressure of the compressed air layer is set to a predetermined value. 請求項2記載のプリーツ膜フィルタの逆洗方法は、請求項1記載のプリーツ膜フィルタの逆洗方法であって、ろ過水室内における逆洗水の逆洗開始時の水位を、大気圧平衡下で所定値に設定した後、ろ過水室内の空気層を加圧してその圧力を所定値に設定することを特徴とする。 Backwash method of pleated membrane filter according to claim 2 wherein, there is provided a backwashing method pleated membrane filter according to claim 1, wherein, the water level at the start backwashing backwash water in the filtered water chamber, the atmospheric pressure equilibration under in after setting a predetermined value, an air layer of filtered water chamber is pressurized and sets the pressure to a predetermined value. 請求項3記載のプリーツ膜フィルタの逆洗方法は、請求項1記載のプリーツ膜フィルタの逆洗方法であって、目板を境に下部に形成されるエレメント室内に供給する逆洗水の初期水位を、該初期水位からろ過水室内での水位が所定値に至るまで逆洗水を圧入した場合に、ろ過水室内に所定値の圧力を有する圧縮空気層が形成される水位として予め決定しておき、大気圧平衡下、 Backwash method of pleated membrane filter according to claim 3, there is provided a backwashing method pleated membrane filter according to claim 1, wherein, the initial backwash water supplied to the chamber elements that are formed in the lower bordering the batten the water level, when the water level in the filtrate chamber from the initial water level was injected backwash water up to a predetermined value, pre-determined as a water level compressed air layer is formed having a pressure of a predetermined value to the filtered water chamber leave, atmospheric pressure equilibrium under,
塔本体の下部より、該初期水位に至るまで逆洗水をエレメント室内に供給し、次に、ろ過水室内での逆洗水の水位が所定値に至るまで逆洗水を圧入して、ろ過水室内における逆洗水の逆洗開始時の水位と圧縮空気層の圧力とを所定値に設定することを特徴とする。 From the bottom of the column body, supplying backwash water to the element chamber up to the initial level, then, the water level of the backwash water in the filtered water chamber is pressed backwash water up to a predetermined value, filtered the pressure of the backwash start level and the compressed air layer of the backwash water in the water chamber and setting to a predetermined value. 請求項4記載のプリーツ膜フィルタの逆洗方法は、請求項1記載のプリーツ膜フィルタの逆洗方法であって、目板を境に下部に形成されるエレメント室内に供給する逆洗水の初期水位を、該初期水位からろ過水室内での水位が所定値に至るまで逆洗水を圧入した場合に、ろ過水室内に所定値の圧力を有する圧縮空気層が形成される水位として予め決定しておき、大気圧平衡下、塔本体の下部より、該初期水位に至るまで逆洗水をエレメント室内に供給し、次に、 Backwash method of pleated membrane filter according to claim 4, wherein, there is provided a backwashing method pleated membrane filter according to claim 1, wherein, the initial backwash water supplied to the chamber elements that are formed in the lower bordering the batten the water level, when the water level in the filtrate chamber from the initial water level was injected backwash water up to a predetermined value, pre-determined as a water level compressed air layer is formed having a pressure of a predetermined value to the filtered water chamber advance, under equilibrium atmospheric pressure, from the bottom of the column body, supplying backwash water to the element chamber up to the initial level, then,
ろ過水室内の空気層の圧力が所定値に至るまで逆洗水を圧入して、ろ過水室内における逆洗水の逆洗開始時の水位と圧縮空気層の圧力とを所定値に設定することを特徴とする。 The pressure of the filtered water indoor air layer is pressed backwash water up to a predetermined value, it sets the reverse washing start water level of the backwash water in the filtered water chamber and the pressure of the compressed air layer to a predetermined value the features.

【0011】 [0011]

【発明の実施の形態】次に、図面に基づいて本発明をさらに詳細に説明する。 DETAILED DESCRIPTION OF THE INVENTION Next, a more detailed description of the present invention with reference to the accompanying drawings. 図1は、本発明の第1の実施の形態にかかるプリーツ膜フィルタの逆洗方法を説明するための図である。 Figure 1 is a diagram for explaining a backwash method of pleated membrane filter according to the first embodiment of the present invention. 図1において、1はろ過塔の塔本体を示し、2はプリーツ膜フィルタを示す。 In Figure 1, 1 denotes a column body of the filtration tower, 2 represents a pleated membrane filter. 塔本体1内には、 The tower body 1,
複数の取り付け孔を備えた目板1aが配設されており、 Batten 1a having a plurality of mounting holes are disposed,
この目板1aを境として上部にろ過水室1bが、下部にエレメント室1cが形成されている。 Filtered water chamber 1b on top of the batten 1a as a boundary is, element chamber 1c is formed at the bottom. プリーツ膜フィルタ2は、上部が目板1aの各取り付け孔に固定されてエレメント室1c内に複数本配設される。 Pleated membrane filter 2, the upper is a plurality of disposed batten 1a each mounting hole to be fixed element chamber 1c of.

【0012】また、塔本体1の下部には、ドレン管3、 [0012] In addition, in the lower portion of the column body 1, drain tube 3,
逆洗水供給管4が接続されており、それぞれ、開閉弁3 And backwash water supply pipe 4 is connected, respectively, on-off valve 3
a,4aが介在配設されている。 a, 4a is interposed arranged. なお、4bは逆洗水を圧送するためのポンプである。 Incidentally, 4b is a pump for pumping the backwash water. 一方、塔本体1の上部には、それぞれ、開閉弁5a,6aが介在配設されているろ過水排出管5と空気抜き管6が接続されている。 On the other hand, the upper portion of the column body 1, respectively, the on-off valve 5a, 6a is vent line 6 and filtered water discharge pipe 5 are interposed disposed are connected. また、本実施の形態では、ろ過水室1bに、開閉弁7aが介在配設された圧縮空気供給管7を介して圧縮機8が接続されていると共に、ろ過水室1b内の水位を検出する液面計9aと圧力を検出する圧力計9bが設けられている。 Further, in this embodiment, the filtering water chamber 1b, with the compressor 8 through the compressed air supply pipe 7 the opening and closing valve 7a is interposed arranged are connected, detecting the water level in the filtering water chamber 1b pressure gauge 9b for detecting a liquid level gauge 9a and pressure are provided.

【0013】本実施の形態によれば、ろ過によりプリーツ膜フィルタ2の差圧が高くなったならば、図1(a) According to this embodiment, if the differential pressure of the pleated membrane filter 2 becomes higher by filtration, FIGS. 1 (a)
に示したように、被処理水の供給を停止し、ろ過水排出管5の開閉弁5aを閉じて、空気抜き管6の開閉弁6a As shown in, to stop the supply of the water to be treated, by closing the on-off valve 5a of the filtrate water discharge pipe 5, the on-off valve 6a of the air vent tube 6
及びドレン管3の開閉弁3aを開放し、塔本体1内に残留している被処理水を全て排出する。 And opens the opening and closing valve 3a of the drain pipe 3, to discharge all the treated water remaining in the column body 1. 次に、図1(b) Next, and FIG. 1 (b)
に示したように、ドレン管3の開閉弁3aを閉じる一方、空気抜き管6の開閉弁6aは開放したまま、逆洗水供給管4の開閉弁4aを開放し、ポンプ4bを起動して逆洗水を大気圧平衡下で供給する。 As shown in, while closing the opening and closing valve 3a of the drain pipe 3, while on-off valve 6a of the air vent tube 6 is opened to open the opening and closing valve 4a of backwash water supply pipe 4, the reverse start the pump 4b the wash water to be supplied under equilibrium atmospheric pressure. この際、液面計9a At this time, the level gauge 9a
によりモニタして、目板1a上のろ過水室1b内に保有される逆洗水の水位が所定値に至るまで供給する。 Monitored by supplies water level of the backwash water to be retained in the filtration water chamber 1b on batten 1a is up to the predetermined value.

【0014】ここで、この逆洗開始時における逆洗水の水位の決定方法について説明する。 [0014] Here, a method determining the water level of the backwash water during the backwash initiation. プリーツ膜フィルタ2の逆洗は、圧縮空気層の膨張によって、ろ過水室1b Backwash the pleated membrane filter 2, by the expansion of the compressed air layer, filtered water chamber 1b
内の逆洗水の水面を、目板1aを通り過ぎるまで、急速に押し下げることによって行われる。 The water surface of the backwash water of the inner, up past the batten 1a, performed by rapidly depressing. 従って、ろ過水室1b内に保有される逆洗開始時の逆洗水の水位のみに着眼すれば、その水位は高いほど効果的な逆洗を行うことができる。 Therefore, if paying attention only to the water level of the backwash water at the start backwashing to be held in the filtered water chamber 1b, the water level can perform higher effective backwashing. しかしながら、上記したように、プリーツ膜フィルタ2の耐圧強度との関係から、圧縮空気層の圧力はそれほど高くすることができない。 However, as described above, from the relationship between the compressive strength of the pleated membrane filter 2, the pressure of the compressed air layer can not be so high. 従って、効果的な逆洗を行うためには、ろ過水室1b内に保有される逆洗開始時の逆洗水の水位が高いほど好ましいといっても、 Therefore, for effective backwashing, to say that preferably as the water level of the backwash water at the start backwashing to be held in the filtered water chamber 1b is high,
高くなればなるほど、ろ過水室1b内で保有可能な圧縮空気容積が少なくなり、少なすぎる場合には、逆洗開始後の急激な圧力低下により、ろ過水室1b内で保有されている逆洗水が目板1aを通過する前に、圧縮空気層が膨張しきってしまい、十分な逆洗流速を得られない。 The higher, when the filtration water chamber compressed air volume is reduced can be held within 1b, too small, the sudden pressure drop after the start backwashing are held within the filtration water chamber 1b backwash before water is passed through the eye plate 1a, the compressed air layer will be completely inflated, not obtain sufficient backwash flow rate. このため、ろ過水室1b内の逆洗開始時の逆洗水の水位は、圧縮空気層の圧力を考慮した上で、ろ過水室1b内に十分な逆洗流速が得られるだけの圧縮空気層容積を確保できるように決定する必要がある。 Therefore, the water level of the backwash water at the start backwashing the filtration water chamber 1b is in consideration of the pressure of the compressed air layer, only compressed air sufficient backwash flow rate is obtained in the filtration of water chamber 1b it is necessary to determine so as to ensure the layer volume.

【0015】本発明者はろ過水室1b内における逆洗開始時の逆洗水の最適な水位を決定するため、逆洗水量のろ過水室全容積に対する比率(水容積率)を種々変化させ、逆洗によりプリーツ膜フィルタ2を構成するろ過膜に与えられる総流動エネルギーの時間積分値を次式により計算し、その最大値を1としてプロットし、図4のグラフに示した。 [0015] Since the present inventors to determine the optimum level of the backwash water at the start of backwashing in a filtered water chamber 1b, while varying the ratio (water volume ratio) for the filtered water chamber total volume of backwash water the time integral value of the total flow energy imparted to the filtration film constituting the pleated membrane filter 2 by backwashing was calculated by the following equation, and plot its maximum value as 1, shown in the graph of FIG.

【0016】 [0016]

【数1】 [Number 1]

【0017】この結果から明らかなように、逆洗開始時の圧縮空気層の圧力を、一般的なプリーツ膜フィルタ2 [0017] The pressure As is apparent from this result, backwash starting compressed air layer, typical pleated membrane filter 2
の耐圧強度である4kgf/cm 2 Gに設定した場合には、ろ過水室1b内の水容積率が約50〜55%になるように、 Of the case of setting to 4 kgf / cm 2 G is a pressure resistance, as water volume ratio in the filtered water chamber 1b is about 50 to 55 percent,
逆洗水の水位を決定するのが適当であるとの知見を得た。 To determine the water level of the backwash water to obtain a knowledge that is appropriate. これによれば、例えば、内径1.65m、直胴部3.8m、容量9.7m で、目板1aを上部直胴端より0.9m下がった位置に設置したろ過塔の場合には、 According to this, for example, an inner diameter of 1.65 m, a straight body portion 3.8 m, a volume 9.7 m 3, in the case of a filtration column was installed batten 1a to 0.9m down position from the upper straight body end ,
目板1a上の水位が約0.63m(水容積率55%の場合)となるように逆洗水の所定値が決定される。 Predetermined value of backwash water so the water level on the eye plate 1a is about 0.63 m (for water volume ratio 55%) is determined. 同じろ過塔を使用し、図5に示した従来の方法で、ろ過水室内の圧力を4kgf/cm 2 Gに設定することだけを基準にした場合に、目板1a上の水位が約0.3mになることと比較すると、本実施の形態によれば、約2倍の有効な逆洗水量を得ることができ、また、ろ過膜に対して与えられる逆洗流動エネルギーを約1.4倍にすることができる。 Using the same filtration column, in the conventional method shown in FIG. 5, when a reference only to set the pressure of the filtered water chamber to 4 kgf / cm 2 G, the water level on the batten 1a is about 0. compared to be a 3m, according to this embodiment, it is possible to obtain effective backwash water of about 2-fold, also about 1.4 times the backwash flow energy given to a filtration membrane it can be.

【0018】なお、図4から明らかなように、総流動エネルギーの時間積分値(比)は、水容積率50〜55% [0018] As is clear from FIG. 4, the time integral value of the total flow energy (ratio), the water volume rate of 50-55%
付近がピークであるが、プリーツ膜フィルタ2に付着した懸濁物の性状やプリーツ膜フィルタの耐圧強度等によっては、他の容積比が適当な場合もある。 While nearby the peak, depending on such pressure resistance of properties and pleated membrane filter suspension adhering to the pleated membrane filter 2, in some cases other volume ratios suitable. 例えば、逆洗時間は短くてもより急激な流速で逆洗した方が懸濁物が除去されやすい場合には、逆洗水の比率を小さくすることができるし、逆洗流速が多少下がっても、逆洗時間をより長くした方が懸濁物が除去されやすい場合には、逆洗水の比率を大きくすることができる。 For example, when a person who was back washed with more rapid flow rates even backwash time is short is likely to be removed suspension, it can be reduced the proportion of backwash water and backwash flow rate slightly decreased also, when a person who has a longer backwashing for easy suspension is removed, it is possible to increase the ratio of the backwash water. 但し、図4から判断すると、圧縮空気層の圧力を一般的なプリーツ膜フィルタ2の耐圧強度である4kgf/cm 2 Gに設定した場合には、水容積率40〜65%前後の範囲で調整するのが好ましい。 However, judging from Fig. 4, in the case of setting the pressure of the compressed air layer 4 kgf / cm 2 G is a compressive strength of typical pleated membrane filter 2, adjusted in a range around the water volume rate of 40-65% it is preferable to. また、水容積率のピーク付近以上に水位を設定した場合、水量が多くても流動エネルギーが低いため十分な逆洗が行われず、好ましくない。 Also, if you set the water level above the vicinity of the peak of the water volume rate, even if many water not performed sufficient backwashing has a low flow energy, which is not preferable.

【0019】上記のようにして、逆洗水の水位を所定値に設定したならば、図1(c)に示したように、空気抜き管6の開閉弁6a及びドレン管3の開閉弁3aを閉じる一方、開閉弁7aを開放して、圧縮機8を起動し、ろ過水室1b内に圧縮空気を圧送して空気層を加圧する。 [0019] As described above, if you set the water level of the backwash water to a predetermined value, as shown in FIG. 1 (c), the on-off valve 6a and the on-off valve 3a of the drain pipe 3 in the vent line 6 Close the other hand, by opening the on-off valve 7a, to start the compressor 8, pressurized air layer by pumping compressed air into the filtration water chamber 1b.
圧力計9bによりモニタして、ろ過水室1b内に形成される圧縮空気層の圧力が所定値に至るまで加圧し、開閉弁7aを閉じる。 Monitored by a pressure gauge 9b, pressurized to a pressure of the compressed air layer formed in the filtration water chamber 1b reaches a predetermined value, it closes the shutoff valve 7a. このときの圧力は、プリーツ膜フィルタ2の耐圧強度を考慮して決定されるが、プリーツ膜フィルタ2の耐圧強度は通常、4kgf/cm 2 G以下であるため、その値以下の圧力が設定される。 The pressure at this time is determined in consideration of the pressure resistance of the pleated membrane filter 2, the pressure resistant strength of the pleated membrane filter 2 is typically because it is less 4 kgf / cm 2 G, the pressure of that value or less is set that.

【0020】次に、図1(d)に示したように、ドレン管3の開閉弁3aのみを開放する。 Next, as shown in FIG. 1 (d), to open only the on-off valve 3a of the drain pipe 3. これにより、ろ過水室1b内の圧縮空気層が膨張し、ろ過水室1b内の逆洗水の水位が下がり、プリーツ膜フィルタ2の内側から外側へと逆洗水が流出し、逆洗が行われる。 Thus, the compressed air layer is expanded in the filtration water chamber 1b, falling water level of the backwash water in the filtration water chamber 1b is, backwash water flows out to the outside from the inside of the pleated membrane filter 2, is backwashing It takes place. 逆洗水の水位が下がり、目板1a以下となったならば、空気抜き管6 Lower the water level of the backwash water, if equal to or less than batten 1a, vent line 6
の開閉弁6aを開放し、逆洗排水を塔本体1外へ排出する。 To open the on-off valve 6a, to discharge the backwash drainage to the column body 1 outside.

【0021】逆洗排水が全て塔本体1外へ排出されたならば、ドレン管3の開閉弁3aを閉じる一方、逆洗水供給管4の開閉弁4aを開放して、ポンプ4bを起動し、 [0021] If the backwash effluent is discharged to all tower body 1 outside, while closing the opening and closing valve 3a of the drain pipe 3, and opens the opening and closing valve 4a of backwash water supply pipe 4, to start the pump 4b ,
上記と全く同様の操作を数回、通常2回から5回程度繰り返す。 Several times exactly the same operations as above are repeated about five times usually twice.

【0022】本実施の形態によれば、大気圧平衡下で逆洗水の水位を所定値に設定した後、ろ過水室1b内に所定圧力の圧縮空気層を形成している。 According to the present embodiment, after the water level of the backwash water under equilibrium atmospheric pressure is set to a predetermined value, to form a compressed air layer of a predetermined pressure to the filtration water chamber 1b. 従って、逆洗開始時におけるろ過水室1b内の逆洗水の水位と圧縮空気層の圧力の両方を、効果的な逆洗が期待できる好ましい値(所定値)に設定してから逆洗を行うことができる。 Thus, both the pressure of the water and the compressed air layer of backwash water in the filtration water chamber 1b at the start backwashing, a backwashing after setting the effective preferred values ​​backwashing can be expected (predetermined value) It can be carried out.

【0023】図2は、本発明の第2の実施の形態にかかるプリーツ膜フィルタの逆洗方法を説明するための図である。 [0023] FIG. 2 is a diagram for explaining a backwash method of pleated membrane filter according to the second embodiment of the present invention. 図1と同じ符号は同じ部材を示すが、本実施の形態においては、目板1aの下部に形成されるエレメント室1c内の水位を検知するための液面計9cが、ろ過水室1b用の液面計9aとは別に配設されている点で異なる。 The same reference numerals as in FIG. 1 indicate the same members, in this embodiment, the level gauge 9c for sensing the water level in the element chamber 1c is formed at the bottom of the batten 1a is, for filtration water chamber 1b the liquid level gauge 9a differs in that it is separately disposed.

【0024】本実施の形態においても、上記第1の実施の形態で説明したように、ろ過水室1b内の逆洗開始時の水位と圧縮空気層の圧力を所定値に設定してから逆洗を開始する点では同じであり、設定しようとする値(所定値)の決定方法も同じであるが、設定方法が異なる。 [0024] Also in this embodiment, as explained in the first embodiment, the reverse pressure backwashing start level and the compressed air layer within the filtration water chamber 1b from the set to a predetermined value it is the same in terms of starting the washing, but the method of determining the value to be set (predetermined value) is also the same, different setting methods.
すなわち、上記第1の実施の形態で説明した手段と同様の方法により、図4のグラフに示したように、圧縮空気層の圧力を考慮して適切な逆洗水の水位を決定したならば、次に、予めエレメント室1c内に大気圧平衡下で溜めておく逆洗水の初期水位を決定する。 That is, by the same method and means described in the first embodiment, as shown in the graph of FIG. 4, in consideration of the pressure of the compressed air layer if determined the water level in the appropriate backwash water , then, to determine the initial level of backwash water to be accumulated at atmospheric pressure equilibration under previously to the element chamber 1c. 具体的には、エレメント室1c内の初期水位をどの程度にすると、ポンプ4bを起動して逆洗水を圧入しただけで、ろ過水室1 Specifically, when the degree of the initial water level in the element chamber 1c, only by press-fitting the backwash water to start the pump 4b, filtered water chamber 1
b内において所望の逆洗水の水位と圧縮空気層の圧力が得られるかを決定しておく。 The pressure of the water level and the compressed air layer of the desired backwash water You have determined resulting in a b.

【0025】初期水位が決定したならば、ろ過により差圧が高くなった時点で、図2(a)に示したように、被処理水の供給を停止した後、ろ過水排出管5の開閉弁5 [0025] If the initial water level is determined, at the time the differential pressure is increased by filtration, as shown in FIG. 2 (a), after stopping the supply of the water to be treated, the opening and closing of the filtered water discharge pipe 5 valve 5
aを閉じ、空気抜き管6の開閉弁6a及びドレン管3の開閉弁3aを開放し、塔本体1内に残留している被処理水を全て排出する。 Close a, to open the on-off valve 6a and the on-off valve 3a of the drain pipe 3 in the vent line 6, to discharge all the treated water remaining in the column body 1. 次に、図2(b)に示したように、 Next, as shown in FIG. 2 (b),
ドレン管3の開閉弁3aを閉じる一方、空気抜き管6の開閉弁6aは開放したまま、逆洗水供給管4の開閉弁4 While closing the on-off valve 3a of the drain pipe 3, while on-off valve 6a of the air vent tube 6 is opened, the backwash water supply pipe 4 of the on-off valve 4
aを開放し、ポンプ4bを起動して逆洗水を大気圧平衡下、液面計9cに基づき、決定した初期水位に至るまでエレメント室1c内に供給する。 Opening the a, atmospheric equilibrium under the backwash water to start the pump 4b, on the basis of the level gauge 9c, supplied to the element chamber 1c up to the determined initial level.

【0026】次に、図2(c)に示したように、空気抜き管6の開閉弁6aを閉じ、液面計9aにより、目板1 Next, as shown in FIG. 2 (c), closing the on-off valve 6a of the air vent tube 6, the level gauge 9a, batten 1
a上のろ過水室1b内に保有される逆洗水の水位が所定値に至るまで圧入する。 The water level of the backwash water to be held in the filtered water chamber 1b on a is press-fitted up to a predetermined value. 本実施の形態によれば、ろ過水室1b内に保有される逆洗水の水位が所定値に至ったならば、その上方に形成される圧縮空気層の圧力が所定値に至るように初期水位が決定されているため、逆洗水の水位が所定値に至っていれば、圧縮空気層の圧力も所定値に至っている。 According to the present embodiment, the initial as if the water level of the backwash water to be held in the filtered water chamber 1b has reached the predetermined value, the pressure of the compressed air layer formed thereabove reaches the predetermined value since the water level is determined, if the water level of the backwash water if reached the predetermined value, the pressure of the compressed air layer also reaches a predetermined value. 従って、図2(d)に示したように、 Accordingly, as shown in FIG. 2 (d),
ドレン管3の開閉弁3aを開放して逆洗を開始したならば、上記第1の実施の形態と同様に、効果的な逆洗が行われる。 Once started backwash by opening the on-off valve 3a of the drain pipe 3, as in the first embodiment, the effective backwashing is performed.

【0027】ろ過水室1b内の逆洗水の水位が目板1a The water level of the backwash water in the filtration water chamber 1b is batten 1a
以下になったならば、空気抜き管6の開閉弁6aを開放して逆洗排水を排出し、再び、エレメント室1c内で初期水位に至るまで逆洗水を供給して、上記操作を数回繰り返す。 If equal to or less than, the backwash effluent is discharged by opening the on-off valve 6a of the air vent tube 6, again, by supplying backwash water up to the initial water level in the element chamber 1c, several times the operation repeat.

【0028】図3は、本発明の第3の実施の形態にかかるプリーツ膜フィルタの逆洗方法を説明するための図である。 [0028] FIG. 3 is a diagram for explaining a backwash method of pleated membrane filter according to the third embodiment of the present invention. 本実施の形態にかかる逆洗方法は、上記第2の実施の形態とほぼ同様であり、詳細は省略するが、第2の実施の形態では、初期水位から逆洗水の圧入を開始した後、ろ過水室1b内での逆洗水の水位が所定値に至った時点で逆洗水の圧入を停止しているのに対し、本実施の形態では、ろ過水室1bに圧力計9bを設け、ろ過水室1b内の圧縮空気層の圧力が所定値に至った時点で逆洗水の圧入を停止している点で異なる。 Backwash method according to the present embodiment, the is substantially similar to the second embodiment, details are omitted in the second embodiment, after starting the press-fitting of the backwash water from the initial water level , whereas the water level of the backwash water in the filtration water chamber 1b is stopped press-fitting of the backwash water when it reaches a predetermined value, in this embodiment, a pressure gauge 9b in the filtration water chamber 1b provided, except that the pressure of the compressed air layer within the filtration water chamber 1b is stopped press-fitting of the backwash water when it reaches a predetermined value.

【0029】エレメント室1c内における初期水位の決定方法が上記第2の実施の形態と全く同様であるため、 [0029] For the method of determining the initial water level in the element chamber 1c are exactly the same as the second embodiment,
ろ過水室1b内の圧縮空気層の圧力が所定値に至れば、 If the pressure of the compressed air layer within the filtration water chamber 1b is Itare a predetermined value,
必然的にろ過水室1b内の逆洗水の水位が所定値に至る。 The water level of the backwash water in the inevitably filtered water chamber 1b reaches a predetermined value. 従って、本実施の形態においても、ろ過水室1b内の逆洗開始時の水位と圧縮空気層の圧力を所定値に設定してから逆洗を開始することができ、効果的な逆洗を行うことができる。 Thus, also in this embodiment, it is possible to start the backwash pressure backwash start level and the compressed air layer within the filtration water chamber 1b from the set to a predetermined value, an effective backwash It can be carried out.

【0030】なお、上記した各開閉弁としては自動弁を採用することができることはもちろんである。 [0030] Incidentally, it is needless to say that it is possible to employ an automatic valve as the closing valve as described above. また、上記した説明では、ろ過水室1b内の水位を液面計9aにより、圧力を圧力計9bにより検出し、エレメント室1 In the description given above, the level gauge 9a the water level in the filtering water chamber 1b, and the pressure detected by the pressure gauge 9b, element chamber 1
c内の水位を液面計9cにより検出しているが、自動弁やポンプ等に電気信号を発信してそれらの作動を自動制御すべく、液面計9a,9cとしてレベルスイッチを採用し、圧力計9bとして圧力スイッチを採用することができることももちろんである。 Although the water level in c are detected by the liquid level gauge 9c, so as to automatically control their operation by transmitting an electric signal to the automatic valve or a pump or the like, it employs a level switch level gauge 9a, as 9c, it is also capable of adopting the pressure switch as a pressure gauge 9b.

【0031】 [0031]

【発明の効果】本発明のプリーツ膜フィルタの逆洗方法によれば、圧縮空気層の圧力をプリーツ膜フィルタにとって適切な圧力に設定するだけでなく、逆洗開始時におけるろ過水室内の逆洗水の水位と圧縮空気層の圧力の両方を、予め所定値に設定してから逆洗を行っている。 According to pleated membrane backwashing method of the filter of the present invention, not only to set the appropriate pressure the pressure of the compressed air layer for pleated membrane filter backwash of filtered water chamber at the start backwashing both pressure level and the compressed air layer of water, are subjected to backwashing from preset to a predetermined value. 従って、この所定値を効果的な逆洗が期待できる値に設定すれば、逆洗水量と逆洗流速のバランスを適切にとることができ、逆洗効率を従来よりも向上させることができる。 Therefore, by setting the predetermined value for effective backwash can be expected value, it is possible to take proper balance of backwash water and backwash flow rate, backwash efficiency can be improved than before.

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

【図1】本発明の第1の実施の形態にかかるプリーツ膜フィルタの逆洗方法を説明するための図である。 1 is a diagram for explaining a backwash method according pleated membrane filter to a first embodiment of the present invention.

【図2】本発明の第2の実施の形態にかかるプリーツ膜フィルタの逆洗方法を説明するための図である。 2 is a diagram for explaining a backwash method of pleated membrane filter according to the second embodiment of the present invention.

【図3】本発明の第3の実施の形態にかかるプリーツ膜フィルタの逆洗方法を説明するための図である。 3 is a diagram for a third backwash method of pleated membrane filter according to the embodiment of illustrating the present invention.

【図4】逆洗時にプリーツ膜フィルタを構成するろ過膜に与えられる総流動エネルギー比と水容積比との関係を示すグラフである。 4 is a graph showing the relationship between the total flow energy ratio applied to the filtration membrane and the water volume ratio constituting the pleated membrane filter during backwashing.

【図5】従来のプリーツ膜フィルタの逆洗方法を説明するための図である。 5 is a diagram for explaining a backwash method of the conventional pleated membrane filter.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 塔本体 2 プリーツ膜フィルタ 3 ドレン管 4 逆洗水供給管 5 ろ過水排出管 6 空気抜き管 7 圧縮空気供給管 8 圧縮機 9a 液面計 9b 圧力計 9c 液面計 1 column body 2 pleated membrane filter 3 Drain pipe 4 backwash water supply pipe 5 is filtered water discharge pipe 6 vent line 7 compressed air supply pipe 8 compressor 9a level gauge 9b manometer 9c level gauge

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl. 7識別記号 FI テーマコート゛(参考) B01D 29/06 510Z ────────────────────────────────────────────────── ─── of the front page continued (51) Int.Cl. 7 identification mark FI theme Court Bu (reference) B01D 29/06 510Z

Claims (4)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 塔本体内に設けられる目板に支持されて配設されたプリーツ膜フィルタに対し、目板を境に上部に形成されるろ過水室内に圧縮空気層を形成し、該圧縮空気層の膨張作用により、逆洗水の水位を急速に押し下げ、該逆洗水をプリーツ膜フィルタの内側から外側へと流出させることにより逆洗を行うプリーツ膜フィルタの逆洗方法において、 ろ過水室内における逆洗水の逆洗開始時の水位と圧縮空気層の圧力とを所定値に設定して行うことを特徴とするプリーツ膜フィルタの逆洗方法。 To 1. A pleated membrane filter is supported by a batten provided in the column body is disposed to form a compressed air layer is filtered water chamber formed in the upper bordering the batten, the compressed the expansion action of the air layer, rapidly depress the water level of the backwash water, the backwash process of pleated membrane filter for backwashing by flows out to the outside of the backwash water from inside of the pleated membrane filter, filtered water pleated membrane backwashing method filters and performing a pressure backwash start level and the compressed air layer of the backwash water in the room is set to a predetermined value.
  2. 【請求項2】 請求項1記載のプリーツ膜フィルタの逆洗方法であって、ろ過水室内における逆洗水の逆洗開始時の水位を、大気圧平衡下で所定値に設定した後、ろ過水室内の空気層を加圧してその圧力を所定値に設定することを特徴とするプリーツ膜フィルタの逆洗方法。 2. A backwashing method pleated membrane filter according to claim 1, wherein, the water level at the start backwashing backwash water in the filtered water chamber, after setting a predetermined value at atmospheric pressure equilibrium, filtered an air layer of water chamber pressurized pleated membrane backwashing method filters and sets the pressure to a predetermined value.
  3. 【請求項3】 請求項1記載のプリーツ膜フィルタの逆洗方法であって、目板を境に下部に形成されるエレメント室内に供給する逆洗水の初期水位を、該初期水位からろ過水室内での水位が所定値に至るまで逆洗水を圧入した場合に、ろ過水室内に所定値の圧力を有する圧縮空気層が形成される水位として予め決定しておき、大気圧平衡下、塔本体の下部より、該初期水位に至るまで逆洗水をエレメント室内に供給し、次に、ろ過水室内での逆洗水の水位が所定値に至るまで逆洗水を圧入して、ろ過水室内における逆洗水の逆洗開始時の水位と圧縮空気層の圧力とを所定値に設定することを特徴とするプリーツ膜フィルタの逆洗方法。 3. A backwashing method pleated membrane filter according to claim 1, wherein the initial level of the backwash water supplied to the chamber elements that are formed in the lower bordering the batten, the filtered water from the initial water level when the water level in the chamber was injected backwash water up to a predetermined value, a pre-determined advance, atmospheric equilibrium under a water level compressed air layer is formed having a pressure of a predetermined value to the filtered water chamber, the tower from the bottom of the body, supplying the backwash water to the element chamber up to the initial level, then, the water level of the backwash water in the filtered water chamber is pressed backwash water up to a predetermined value, the filtered water pleated membrane backwashing method filters and sets the pressure of the backwash start level and the compressed air layer of the backwash water in the room to a predetermined value.
  4. 【請求項4】 請求項1記載のプリーツ膜フィルタの逆洗方法であって、目板を境に下部に形成されるエレメント室内に供給する逆洗水の初期水位を、該初期水位からろ過水室内での水位が所定値に至るまで逆洗水を圧入した場合に、ろ過水室内に所定値の圧力を有する圧縮空気層が形成される水位として予め決定しておき、大気圧平衡下、塔本体の下部より、該初期水位に至るまで逆洗水をエレメント室内に供給し、次に、ろ過水室内の空気層の圧力が所定値に至るまで逆洗水を圧入して、ろ過水室内における逆洗水の逆洗開始時の水位と圧縮空気層の圧力とを所定値に設定することを特徴とするプリーツ膜フィルタの逆洗方法。 4. A backwash process of pleated membrane filter according to claim 1, wherein the initial level of the backwash water supplied to the chamber elements that are formed in the lower bordering the batten, the filtered water from the initial water level when the water level in the chamber was injected backwash water up to a predetermined value, a pre-determined advance, atmospheric equilibrium under a water level compressed air layer is formed having a pressure of a predetermined value to the filtered water chamber, the tower from the bottom of the body, supplying the backwash water up to the initial level to the element chamber, then the pressure of the filtered water indoor air layer is pressed backwash water up to a predetermined value, the filtered water chamber pleated membrane backwashing method filters and sets the backwash starting level of the backwash water and the pressure of the compressed air layer to a predetermined value.
JP10242027A 1998-08-27 1998-08-27 Backwashing of pleated membrane filter Pending JP2000070684A (en)

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