JP2008289958A - Membrane filtration system - Google Patents

Membrane filtration system Download PDF

Info

Publication number
JP2008289958A
JP2008289958A JP2007135685A JP2007135685A JP2008289958A JP 2008289958 A JP2008289958 A JP 2008289958A JP 2007135685 A JP2007135685 A JP 2007135685A JP 2007135685 A JP2007135685 A JP 2007135685A JP 2008289958 A JP2008289958 A JP 2008289958A
Authority
JP
Japan
Prior art keywords
membrane
membrane module
raw water
water
filtration system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2007135685A
Other languages
Japanese (ja)
Inventor
Takeshi Matsushiro
武士 松代
Hiroyuki Tokimoto
寛幸 時本
Hideji Seki
秀司 関
Koichi Nakagawa
浩一 中川
Shojiro Tamaki
省二郎 環
Masahiko Tsutsumi
正彦 堤
Takumi Obara
卓巳 小原
Yasuhiko Nagamori
泰彦 永森
Ryoichi Arimura
良一 有村
Nobuyuki Ashikaga
伸行 足利
Masanaga Niiyama
雅永 新山
Katsuhiko Tsukamoto
勝彦 塚本
Yoshiyuki Fukano
良之 深野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP2007135685A priority Critical patent/JP2008289958A/en
Publication of JP2008289958A publication Critical patent/JP2008289958A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To enable more efficient reduction of transmembrane pressure difference by carrying out short-time washing a plurality of times. <P>SOLUTION: A membrane filtration system comprises a raw water tank 1 temporarily storing raw water, a membrane module 2 filtering the raw water, a raw water pump 3 supplying the raw water in the raw water tank to the membrane module, a treated water tank 4 storing treated water filtered by the membrane module, a compressor 5 supplying pressurized air into the membrane module, and a backwashing water pump 6 supplying the treated water to the membrane module as washing water. In a membrane module washing process, the membrane module 2 is washed plural times until its transmembrane pressure difference becomes a predetermined value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、例えば表流水・地下水などの淡水、雨水貯水，産業廃水，下水等の汚水、バラスト水等の海水の水処理に適した膜ろ過システムに関する。   The present invention relates to a membrane filtration system suitable for the treatment of fresh water such as surface water and groundwater, rainwater storage, industrial wastewater, sewage such as sewage, and seawater such as ballast water.

従来、水処理分野において、原水（例えば、表流水，地下水等の淡水、雨水貯水，産業廃水，下水等の汚水、バラスト水等の海水）をろ過して、生活用水、工業用水、農業用水を得る方法として、例えば、精密ろ過膜、限外ろ過膜、ナノろ過膜、逆浸透膜が用いられている。   Conventionally, in the field of water treatment, raw water (for example, fresh water such as surface water, groundwater, rainwater storage water, industrial wastewater, sewage such as sewage, seawater such as ballast water) is filtered and used for domestic water, industrial water, and agricultural water. As a method of obtaining, for example, a microfiltration membrane, an ultrafiltration membrane, a nanofiltration membrane, or a reverse osmosis membrane is used.

膜は、原水中の微生物、藻類、粘土等の固形分に対して高い分離性能を有しており、水処理分野での適用が拡大している。近年では、膜の素材として親水性材料を用いるのが一般的である。また、疎水性材料を用いる場合でも、膜面を重クロム酸カリの硫酸溶液等で親水化処理することで、ろ過性能を向上させることが検討されている（例えば、特許文献１参照）。   The membrane has a high separation performance with respect to solids such as microorganisms, algae and clay in the raw water, and its application in the water treatment field is expanding. In recent years, it is common to use a hydrophilic material as the material of the membrane. Even when a hydrophobic material is used, it has been studied to improve the filtration performance by hydrophilizing the membrane surface with a sulfuric acid solution of potassium dichromate or the like (see, for example, Patent Document 1).

しかしながら、膜は、継続的に原水を通水することによって、膜外表面や膜孔内に原水中の溶質が堆積してろ過抵抗が増加し、ろ過性能が低下することがある。   However, when the raw water is continuously passed through the membrane, the solute in the raw water accumulates on the outer surface of the membrane or in the pores of the membrane, and the filtration resistance may increase and the filtration performance may deteriorate.

そこで、このような膜ろ過システムでは、予め設定された周期、あるいは膜が所定の差圧上昇を示した時点で、ろ過した処理水や圧縮空気等による物理洗浄を行い、膜外表面や膜孔内の付着物のうち、可逆的なものを取り除いている。   Therefore, in such a membrane filtration system, physical cleaning with filtered treated water or compressed air is performed at a preset cycle or when the membrane shows a predetermined differential pressure increase, and the membrane outer surface or membrane pores Of the deposits inside, reversible ones are removed.

一方、膜外表面や膜孔内には、このような物理洗浄で除去し難い付着物が徐々に蓄積するため、膜差圧が予め設定されている上限値を越えた時点で、膜ろ過処理を停止して薬品洗浄を行い、物理洗浄で除去できなかった付着物を除去している。   On the other hand, deposits that are difficult to remove by such physical cleaning gradually accumulate on the outer surface of the membrane and in the membrane pores, so when the membrane differential pressure exceeds the preset upper limit value, membrane filtration treatment Is stopped and chemical cleaning is performed to remove deposits that could not be removed by physical cleaning.

そして、薬品洗浄を行っても、膜表面や内部等の付着物が取り除けなくなり、膜差圧の回復が認められなくなった場合、あるいは、膜の使用期間がある一定期間を超えた場合には、膜が寿命に達したと判断して交換を行っている。
特開平５−２３５５３号公報 And even if chemical cleaning is performed, it is impossible to remove deposits such as the membrane surface and inside, and recovery of the membrane differential pressure is not recognized, or when the usage period of the membrane exceeds a certain period, The membrane is replaced when it is judged that it has reached the end of its life.
Japanese Patent Laid-Open No. 5-23553

このような膜ろ過システムでは、薬品洗浄、ろ過膜の交換等を行なうごとに、膜ろ過処理を停止しなければならない。このことから、薬品洗浄の頻度やろ過膜の交換頻度をなるべく少なくし、膜ろ過システムの稼働率を高くするとともに、薬品洗浄や膜交換に要するコストを低減する必要がある。   In such a membrane filtration system, the membrane filtration process must be stopped each time chemical cleaning, filtration membrane replacement, or the like is performed. For this reason, it is necessary to reduce the frequency of chemical cleaning and filtration membrane replacement as much as possible, increase the operating rate of the membrane filtration system, and reduce the cost required for chemical cleaning and membrane replacement.

本発明はこうした事情を考慮してなされたもので、処理水量を多くしてシステム稼働率を高くするとともに、薬品洗浄や膜交換に要する費用を低減させ、トータルのランニングコストを低減することができる膜ろ過システムを提供することを目的としている。   The present invention has been made in consideration of such circumstances, and can increase the amount of treated water to increase the system operation rate, reduce the cost required for chemical cleaning and membrane replacement, and reduce the total running cost. The object is to provide a membrane filtration system.

（１）本発明に係る膜ろ過システムは、請求項１記載のように、原水を一時的に貯水する原水槽と、原水をろ過する膜モジュールと、原水槽の原水を膜モジュールに供給する原水ポンプと、膜モジュールでろ過された処理水を貯水する処理水槽と、膜モジュール内に加圧空気を供給するコンプレッサと、処理水を洗浄水として膜モジュールに供給する逆洗水ポンプとを備えた膜ろ過システムであり、膜モジュールの洗浄工程において、所定の膜差圧となるまで膜モジュールを複数回洗浄することを特徴とする。   (1) A membrane filtration system according to the present invention, as described in claim 1, is a raw water tank that temporarily stores raw water, a membrane module that filters raw water, and raw water that supplies raw water from the raw water tank to the membrane module. A pump, a treated water tank for storing treated water filtered by the membrane module, a compressor for supplying pressurized air into the membrane module, and a backwash water pump for supplying treated water as washing water to the membrane module In the membrane filtration system, the membrane module is washed a plurality of times until a predetermined membrane differential pressure is reached.

（２）また、本発明に係る膜ろ過システムは、上記（１）において、所定の期間に対する膜差圧の上昇率が一定となるまで膜モジュールを複数回洗浄することを特徴とする。
（３）更に、本発明に係る膜ろ過システムは、上記（１）又は（２）において、洗浄する回数の上限値を予め設定することを特徴とする。
（４）更には、本発明に係る膜ろ過システムは、上記（１）〜（３）において、逆通水する時間は逆通水時の膜差圧あるいは流量を計測して、いずれかの値の傾きが一定になる時間により決定することを特徴とする。 (2) The membrane filtration system according to the present invention is characterized in that, in the above (1), the membrane module is washed a plurality of times until the rate of increase of the membrane differential pressure with respect to a predetermined period becomes constant.
(3) Furthermore, the membrane filtration system according to the present invention is characterized in that, in the above (1) or (2), an upper limit value of the number of times of cleaning is set in advance.
(4) Further, in the membrane filtration system according to the present invention, in the above (1) to (3), the time during which reverse water flow is measured by measuring the membrane differential pressure or flow rate during reverse water flow, It is characterized in that it is determined by the time during which the slope of becomes constant.

本発明によれば、短時間の洗浄を複数回洗浄することによって、より効果的に膜差圧を低減することができる。   According to the present invention, the membrane differential pressure can be more effectively reduced by performing a plurality of short-time cleaning operations.

以下、本発明の膜ろ過システムの実施形態について図面を参照して説明する。
図１は、本発明に係る膜ろ過システムの一実施形態を示す構成図である。
膜ろ過システムは、図示しない導水ポンプによって導かれた原水を一時的に貯水する原水槽１と、原水をろ過する，例えば中空糸型の膜モジュール２と、原水槽１の原水を膜モジュールに供給する原水ポンプ３と、膜モジュール２でろ過された処理水を貯水する処理水槽４と、膜モジュール２内に加圧空気を供給するコンプレッサ５と、処理水を洗浄水として膜モジュール２に供給する逆洗水ポンプ６とを備えている。 Hereinafter, an embodiment of a membrane filtration system of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram showing an embodiment of a membrane filtration system according to the present invention.
The membrane filtration system is a raw water tank 1 for temporarily storing raw water guided by a water pump (not shown), a raw fiber for filtering the raw water, for example, a hollow fiber type membrane module 2, and supplying raw water from the raw water tank 1 to the membrane module. Raw water pump 3, treated water tank 4 for storing treated water filtered by the membrane module 2, a compressor 5 for supplying pressurized air into the membrane module 2, and treated water as washing water to the membrane module 2 And a backwash water pump 6.

図１中の７１〜７８は夫々配管を示し、８ａ〜８ｋは夫々バルブを示す。配管７１は原水槽１の下部側と膜モジュール２の底部を結ぶ配管で、バルブ８ａ，８ｂが介装されている。配管７２は膜モジュール２の上部と処理水槽４の上部を接続する配管で、バルブ８ｃ，８ｄが介装されている。配管７３は膜モジュール２の底部に接続された配管で、バルブ８ｅが介装されている。配管７４は膜モジュール２の上部側に接続された配管で、バルブ８ｆが介装されている。配管７５は配管７４に接続された配管で、バルブ８が介装されている。配管７６はコンプレッサ５と膜モジュール２の下部側を接続する配管で、バルブ８ｈが介装されている。配管７７はコンプレッサ５に接続する配管７６から分岐して配管７２に接続する配管で、バルブ８ｉが介装されている。配管７８は処理水槽４の底部と配管７２とを接続する配管で、バルブ８ｋが介装されている。 In FIG. 1, 7 1 to 7 8 denote pipes, and 8 a to 8 k denote valves. Pipe 7 1 a pipe connecting the bottom portion of the lower side and the membrane module 2 in the raw water tank 1, the valve 8a, 8b is interposed. Pipe 7 2 in pipe connecting the upper part of the treatment water tank 4 and the top of the membrane module 2, the valve 8c, 8d is interposed. Pipe 7 3 by a pipe connected to the bottom of the membrane module 2, the valve 8e is interposed. Pipe 7 4 in pipe connected to the upper side of the membrane module 2, the valve 8f is interposed. Pipe 7 5 a pipe connected to the pipe 7 4, the valve 8 is interposed. Pipe 7 6 in pipe connecting the bottom side of the compressor 5 and the membrane module 2, the valve 8h is interposed. Pipe 7 7 a pipe to be connected to the second pipe 7 is branched from the pipe 7 6 connected to the compressor 5, the valve 8i is interposed. Pipe 7 8 a pipe connecting the bottom of the treating tank 4 and a pipe 7 2, valve 8k is interposed.

図１の膜ろ過システムの作用は、次の通りである。
同膜ろ過システムにおいて、原水は図示しない導水ポンプによって原水槽１へ導かれている。そして、原水ポンプ３の加圧によって膜モジュール２に原水が導入され、膜モジュール２を透過した処理水は処理水槽４に貯留される。通常の洗浄は、下記の手順の（１）の逆圧水工程と（２）の原水すすぎ工程を所定の膜差圧となるまで複数回繰り返すことにより実施する。 The operation of the membrane filtration system of FIG. 1 is as follows.
In the membrane filtration system, raw water is guided to the raw water tank 1 by a water pump (not shown). Then, raw water is introduced into the membrane module 2 by pressurization of the raw water pump 3, and the treated water that has permeated the membrane module 2 is stored in the treated water tank 4. The normal cleaning is performed by repeating the reverse pressure water step (1) and the raw water rinsing step (2) in the following procedure a plurality of times until a predetermined membrane differential pressure is reached.

（１）逆圧水工程
バルブ８ｂ，８ｄ，８ｇ，８ｉを閉め、バルブ８ｃ，８ｊ，８ｋが開いた状態で処理水槽４内の処理水を逆洗水ポンプ６により膜モジュール２の処理水側から逆流させ、膜モジュール２の下部の原水側の配管７３か、あるいは膜モジュール２上部の原水側の配管７４から排出する。このとき、コンプレッサ５によって膜モジュール２の配管７６の原水側から加圧空気を流して膜モジュール２を揺動させる。 (1) Reverse pressure water process
The valves 8b, 8d, 8g, and 8i are closed, and the treated water in the treated water tank 4 is caused to flow backward from the treated water side of the membrane module 2 by the backwash water pump 6 with the valves 8c, 8j, and 8k opened. bottom of the raw water side pipe 7 3 or, or discharged from the membrane module 2 pipe 7 of the upper portion of the raw water side 4. At this time, swinging the membrane module 2 from the raw water side of the pipe 7 6 of the membrane module 2 by flowing a pressurized air by a compressor 5.

（２）原水すすぎ工程
バルブ８ａ，８ｂ及び膜モジュール２の上部のバルブ８ｆを開け、原水ポンプ３を起動し、膜モジュール２のすすぎを行う。このとき、すすぎ水は原水槽1へ循環しても構わない。また、コンプレッサ５から加圧空気を流したままの方がより効果的にすすぎを行うことができるが、電力費を削減するために加圧空気を停止しても構わない。 (2) Raw water rinsing process
The valves 8a and 8b and the valve 8f above the membrane module 2 are opened, the raw water pump 3 is started, and the membrane module 2 is rinsed. At this time, the rinse water may be circulated to the raw water tank 1. In addition, rinsing can be performed more effectively while the compressed air is allowed to flow from the compressor 5, but the compressed air may be stopped to reduce the power cost.

上記実施形態によれば、原水槽１と、膜モジュール２と、原水ポンプ３と、処理水槽４と、コンプレッサ５と、逆洗水ポンプ６とを備えた膜ろ過システムにおいて、膜モジュール２の短時間洗浄を膜差圧が所定の圧（Ｐ１）になるまで複数回繰り返すことにより、図２に示すようにより効果的に膜差圧を低減することができる。 According to the above embodiment, in the membrane filtration system including the raw water tank 1, the membrane module 2, the raw water pump 3, the treated water tank 4, the compressor 5, and the backwash water pump 6, By repeating the time cleaning a plurality of times until the membrane differential pressure reaches a predetermined pressure (P 1 ), the membrane differential pressure can be more effectively reduced as shown in FIG.

なお、上記実施形態では、膜モジュール２を膜差圧が所定圧になるまで複数回短時間洗浄を行う場合について述べたが、これに限定されない。例えば、所定の期間に対する膜差圧の上昇率が一定となるまで複数回洗浄してもよいし、洗浄する回数の上限値を予め設定してもよい。また、逆通水する時間を、逆通水時の膜差圧あるいは流量を計測して、いずれかの値の傾きが一定になる時間により決定してもよい。   In the above embodiment, the case where the membrane module 2 is cleaned a plurality of times for a short time until the membrane differential pressure reaches a predetermined pressure has been described, but the present invention is not limited to this. For example, cleaning may be performed a plurality of times until the rate of increase in the film differential pressure with respect to a predetermined period becomes constant, or an upper limit value of the number of times of cleaning may be set in advance. Alternatively, the time for reverse water flow may be determined by measuring the membrane differential pressure or flow rate during reverse water flow and the time during which the slope of either value becomes constant.

図３及び図４は、夫々洗浄時間と逆通水時の膜差圧との関係を示す特性図であり、夫々膜モジュールに使用されている中空糸の材質が異なる。なお、図３において、線（ａ），（ｃ）では洗浄時間が５分頃で、線（ｂ）では洗浄時間３分頃から膜差圧が略一定になることが明らかである。また、図４において、線（ａ）では洗浄時間が約２分頃、線（ｂ）では洗浄時間が約５分頃、線（ｃ）では洗浄時間が約４分頃から膜差圧が略一定になることが明らかである。   3 and 4 are characteristic diagrams showing the relationship between the washing time and the membrane differential pressure during reverse water flow, and the materials of the hollow fibers used in the membrane module are different. In FIG. 3, it is clear that the membrane differential pressure becomes substantially constant from about 5 minutes for the lines (a) and (c) and about 3 minutes for the line (b). Also, in FIG. 4, the membrane differential pressure is substantially reduced from about 2 minutes for the line (a), about 5 minutes for the line (b), and about 4 minutes for the line (c). It is clear that it will be constant.

図５及び図６は、夫々洗浄時間と逆通水時の洗浄流量との関係を示す特性図であり、夫々膜モジュールに使用されている中空糸の材質が異なる。図５は図３と同様な膜モジュールのデータであり、図６は図４と同様な膜モジュールのデータである。なお、図５において、線（ａ），（ｃ）では洗浄時間が５分頃、線（ｂ）では洗浄時間３分頃から洗浄流量が略一定になることが明らかである。また、図６において、線（ａ）では洗浄時間が約２分頃、線（ｂ）では洗浄時間が約５分頃、線（ｃ）は洗浄時間４分頃から洗浄流量が略一定になることが明らかである。   FIG. 5 and FIG. 6 are characteristic diagrams showing the relationship between the cleaning time and the cleaning flow rate during reverse water flow, and the materials of the hollow fibers used in the membrane module are different. FIG. 5 shows the data of the membrane module similar to FIG. 3, and FIG. 6 shows the data of the membrane module similar to FIG. In FIG. 5, it is clear that the cleaning flow rate is substantially constant from about 5 minutes for the lines (a) and (c) and about 3 minutes for the line (b). In FIG. 6, the cleaning flow rate is approximately constant for line (a), the cleaning time is approximately 2 minutes, for line (b), the cleaning time is approximately 5 minutes, and for line (c), the cleaning flow rate is approximately constant from approximately 4 minutes. It is clear.

上記実施形態では、図２に示すように物理洗浄を複数回行なって膜差圧をΔＰ１，ΔＰ２，ΔＰ３，ΔＰｋと下げて一定の膜差圧（Ｐ１）にした。しかし、これに限らず、図７に示すように、物理洗浄を複数回行なって膜差圧をΔＰ１，ΔＰ２，ΔＰ３，ΔＰｋと下げ、最終的な膜差圧が一定の膜差圧（Ｐ１）に対し若干傾斜するように調節してもよい。 In the above embodiment, as shown in FIG. 2, physical cleaning is performed a plurality of times, and the film differential pressure is lowered to ΔP1, ΔP2, ΔP3, and ΔPk to obtain a constant film differential pressure (P 1 ). However, the present invention is not limited to this, and as shown in FIG. 7, physical cleaning is performed a plurality of times to lower the film differential pressure to ΔP1, ΔP2, ΔP3, ΔPk, and the final film differential pressure is constant (P 1 ) May be adjusted to be slightly inclined.

上述した他、本発明では、上記実施形態そのままに限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で構成要素を変形して具体化できる。また、上記実施形態に開示されている複数の構成要素の適宜な組み合せにより種々の発明を形成できる。例えば、実施形態に示される全構成要素から幾つかの構成要素を削除してもよい。更に、異なる実施形態に亘る構成要素を適宜組み合せてもよい。   In addition to the above, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

本発明の実施形態に係る膜ろ過システムの説明図を示す。An explanatory view of a membrane filtration system concerning an embodiment of the present invention is shown. 図１の膜ろ過システムにおいて、複数回の物理洗浄を行なった場合の経過時間と膜差圧との関係を示す特性図である。In the membrane filtration system of FIG. 1, it is a characteristic view which shows the relationship between the elapsed time at the time of performing physical cleaning of multiple times, and a membrane differential pressure | voltage. 本発明による洗浄時間と逆通水時の膜差圧との関係を示す特性図である。It is a characteristic view which shows the relationship between the washing | cleaning time by this invention, and the membrane differential pressure at the time of reverse water flow. 本発明による洗浄時間と逆通水時の膜差圧との関係を示す特性図である。It is a characteristic view which shows the relationship between the washing | cleaning time by this invention, and the membrane differential pressure at the time of reverse water flow. 本発明による洗浄時間と逆通水時の洗浄流量との関係を示す特性図である。It is a characteristic view which shows the relationship between the washing | cleaning time by this invention, and the washing | cleaning flow volume at the time of reverse water flow. 本発明による洗浄時間と逆通水時の洗浄流量との関係を示す特性図である。It is a characteristic view which shows the relationship between the washing | cleaning time by this invention, and the washing | cleaning flow volume at the time of reverse water flow. 本発明の膜ろ過システムにおいて、複数回の物理洗浄を行なった場合の経過時間と膜差圧との関係を示す特性図である。In the membrane filtration system of this invention, it is a characteristic view which shows the relationship between the elapsed time at the time of performing physical cleaning of multiple times, and a membrane differential pressure | voltage.

符号の説明Explanation of symbols

１…原水槽、２…原水ポンプ、３…膜モジュール、４…処理水槽、５…コンプレッサ、６…逆洗水ポンプ、７１〜７８…配管、８ａ〜８ｋ…バルブ。 1 ... raw water tank, 2 ... raw water pump, 3 ... membrane module, 4 ... treatment water tank, 5 ... compressor, 6 ... backwash water pump, 7 1-7 8 ... piping, 8A～8k ... valve.

Claims (4)

原水を一時的に貯水する原水槽と、原水をろ過する膜モジュールと、原水槽の原水を膜モジュールに供給する原水ポンプと、膜モジュールでろ過された処理水を貯水する処理水槽と、膜モジュール内に加圧空気を供給するコンプレッサと、処理水を洗浄水として膜モジュールに供給する逆洗水ポンプとを備えた膜ろ過システムであり、
膜モジュールの洗浄工程において、所定の膜差圧となるまで膜モジュールを複数回洗浄することを特徴とする膜ろ過システム。 A raw water tank for temporarily storing raw water, a membrane module for filtering raw water, a raw water pump for supplying raw water from the raw water tank to the membrane module, a treated water tank for storing treated water filtered by the membrane module, and a membrane module A membrane filtration system comprising a compressor for supplying pressurized air therein and a backwash water pump for supplying treated water as wash water to the membrane module;
A membrane filtration system, wherein a membrane module is washed a plurality of times until a predetermined membrane differential pressure is reached in the membrane module washing step. 所定の期間に対する膜差圧の上昇率が一定となるまで膜モジュールを複数回洗浄することを特徴とする請求項１記載の膜ろ過システム。 2. The membrane filtration system according to claim 1, wherein the membrane module is washed a plurality of times until the rate of increase of the membrane differential pressure with respect to a predetermined period becomes constant. 洗浄する回数の上限値を予め設定することを特徴とする請求項１又は２記載の膜ろ過システム。 The membrane filtration system according to claim 1 or 2, wherein an upper limit value of the number of times of washing is set in advance. 逆通水する時間は逆通水時の膜差圧あるいは流量を計測して、いずれかの値の傾きが一定になる時間により決定することを特徴とする請求項１乃至３いずれか記載の膜ろ過システム。 4. The membrane according to any one of claims 1 to 3, wherein the reverse water flow time is determined by the time during which the gradient of any value becomes constant by measuring the differential pressure or flow rate during reverse water flow. Filtration system.
JP2007135685A 2007-05-22 2007-05-22 Membrane filtration system Pending JP2008289958A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007135685A JP2008289958A (en) 2007-05-22 2007-05-22 Membrane filtration system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007135685A JP2008289958A (en) 2007-05-22 2007-05-22 Membrane filtration system

Publications (1)

Publication Number Publication Date
JP2008289958A true JP2008289958A (en) 2008-12-04

Family

ID=40165251

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007135685A Pending JP2008289958A (en) 2007-05-22 2007-05-22 Membrane filtration system

Country Status (1)

Country Link
JP (1) JP2008289958A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012124360A1 (en) * 2011-03-17 2012-09-20 株式会社 東芝 Membrane filtration system, and operation method therefor
KR101732224B1 (en) * 2014-06-26 2017-05-11 롯데케미칼 주식회사 Cleaning system of separation membrane and method using the same
CN107694345A (en) * 2017-11-20 2018-02-16 海南立昇净水科技实业有限公司 Water management system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63221886A (en) * 1987-03-09 1988-09-14 Hitachi Ltd Purifying method and apparatus using hollow yarn membrane filter
JPS63294905A (en) * 1987-05-26 1988-12-01 Nippon Atom Ind Group Co Ltd Method for operating hollow yarn membrane filter
JPH09122460A (en) * 1995-10-30 1997-05-13 Japan Organo Co Ltd Cleaning method for membrane module
JPH1015365A (en) * 1996-07-04 1998-01-20 Kurita Water Ind Ltd Method for cleaning membrane
JP2001170457A (en) * 1999-12-14 2001-06-26 Kurita Water Ind Ltd Washing method for membrane separating device
JP2004073950A (en) * 2002-08-13 2004-03-11 Asahi Kasei Chemicals Corp Membrane washing method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63221886A (en) * 1987-03-09 1988-09-14 Hitachi Ltd Purifying method and apparatus using hollow yarn membrane filter
JPS63294905A (en) * 1987-05-26 1988-12-01 Nippon Atom Ind Group Co Ltd Method for operating hollow yarn membrane filter
JPH09122460A (en) * 1995-10-30 1997-05-13 Japan Organo Co Ltd Cleaning method for membrane module
JPH1015365A (en) * 1996-07-04 1998-01-20 Kurita Water Ind Ltd Method for cleaning membrane
JP2001170457A (en) * 1999-12-14 2001-06-26 Kurita Water Ind Ltd Washing method for membrane separating device
JP2004073950A (en) * 2002-08-13 2004-03-11 Asahi Kasei Chemicals Corp Membrane washing method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012124360A1 (en) * 2011-03-17 2012-09-20 株式会社 東芝 Membrane filtration system, and operation method therefor
JP2012192380A (en) * 2011-03-17 2012-10-11 Toshiba Corp Membrane filtration system, and operation method therefor
KR101732224B1 (en) * 2014-06-26 2017-05-11 롯데케미칼 주식회사 Cleaning system of separation membrane and method using the same
CN107694345A (en) * 2017-11-20 2018-02-16 海南立昇净水科技实业有限公司 Water management system

Similar Documents

Publication Publication Date Title
WO2003059495A1 (en) Methods for improving filtration performance of hollow fiber membranes
WO2013111826A1 (en) Desalination method and desalination device
JP2007296500A (en) Membrane separation apparatus and membrane filtration method
JP2011031245A (en) Membrane filtration system
JP2008289958A (en) Membrane filtration system
JP2008289959A (en) Membrane filtration system
JP5377553B2 (en) Membrane filtration system and its operation method
JP2006255708A (en) Method for backwashing of hollow fiber membrane and hollow fiber membrane water treatment apparatus
JP5017922B2 (en) Water treatment method
JP5230073B2 (en) Membrane damage detection test method for filtration membranes
JP5249104B2 (en) Membrane filtration system and cleaning method thereof
JP6029904B2 (en) Membrane filtration system and operation control method thereof
JP2005046762A (en) Water treatment method and water treatment apparatus
JP3856376B2 (en) Water treatment device and its operation method
CN115103820A (en) Method for controlling water generator based on filter characteristic prediction, method for determining failure of water generator, operation program for water generator, failure determination program for water generator, and recording medium
JP5932272B2 (en) Membrane filtration device, operation method and damage detection device
JP2006130496A (en) Water treatment device and its operating method
KR101513249B1 (en) The Cleaning Method of Pressurized Membrane Module by using Dual-Backwash Process
JP2013034938A (en) Method for washing membrane module
KR101692689B1 (en) System and Method for Filtering Using Positive Pressure Type Module
JP2017176951A (en) Method for cleaning separation membrane module
JP2008259995A (en) Cleaning method and filter apparatus
JP5251472B2 (en) Membrane module cleaning method
JP4834435B2 (en) Automatic cleaning method of strainer for water treatment equipment by membrane filtration
JP2007014829A (en) On-line washing method

Legal Events

Date Code Title Description
A977 Report on retrieval

Effective date: 20100811

Free format text: JAPANESE INTERMEDIATE CODE: A971007

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100914

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20110125