JPH10156147A - Liquid treating device - Google Patents

Liquid treating device

Info

Publication number
JPH10156147A
JPH10156147A JP31899696A JP31899696A JPH10156147A JP H10156147 A JPH10156147 A JP H10156147A JP 31899696 A JP31899696 A JP 31899696A JP 31899696 A JP31899696 A JP 31899696A JP H10156147 A JPH10156147 A JP H10156147A
Authority
JP
Japan
Prior art keywords
water
pressure
liquid
valve
pipe
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
JP31899696A
Other languages
Japanese (ja)
Inventor
Chikakazu Murata
周和 村田
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.)
Organo Corp
Original Assignee
Organo Corp
Japan Organo Co Ltd
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 Organo Corp, Japan Organo Co Ltd filed Critical Organo Corp
Priority to JP31899696A priority Critical patent/JPH10156147A/en
Publication of JPH10156147A publication Critical patent/JPH10156147A/en
Pending legal-status Critical Current

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  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a liquid treating device equipped with a means for easily controlling the feed pressure of raw liquid so that the residual units may be normally operated when any of separation membrane type liquid treatment units operated in parallel automatically stops operating. SOLUTION: This device 10 is the one in which raw water fed by one water feed pump is membrane filtered by parallel operation of water treating units to obtain treated water, and has a water feed pump 14 for feeding raw water and separation membrane modules, and is provided with water treating units 20A-20C connected to plural water feed pipes 18A-18C branching from a delivery pipe 16 on the delivery side of the water fed pump, respectively, and automatic cutoff valves 22A-22C for stopping the water feed to each water treating unit individually and automatically. Furthermore, a raw water relief pipe 28 is installed by branching from the delivery pipe or the water feed pipe between the water feed pump and the automatic cutoff valves 22A-22C. The raw water relief pipe 28 is provided with a relief valve 30 or a pressure regulating valve 32 operated when the raw water pressure exceeds the operating pressure of the valve.

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、濾過エレメントと
して少なくとも1個の分離膜モジュールを有する液体処
理ユニットを並列通液運転して、原液の膜濾過により処
理液を得るようにした液体処理装置に関し、更に詳細に
は、並列通液運転中のいずれかの液体処理ユニットが緊
急停止したとき、残りの液体処理ユニットが正常に運転
できるようにした液体処理装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid processing apparatus in which a liquid processing unit having at least one separation membrane module as a filtration element is operated in parallel so as to obtain a processing liquid by membrane filtration of a stock solution. More specifically, the present invention relates to a liquid processing apparatus that enables normal operation of the remaining liquid processing units when any one of the liquid processing units during the parallel liquid flow operation is emergency stopped.

【0002】[0002]

【従来の技術】液体、例えば湖沼水、河川水等の表流
水、或いは井水等の地下水等の水を原水とし、原水から
産業用水、上水などを得ようとする場合、濾過エレメン
トとして分離膜モジュールを備えた水処理装置を使用
し、原水を濾過して原水中の不溶解性物質及び溶解性物
質を分離した処理水(透過水)を得て、それを所望の産
業用水、或いは上水とすることが多い。ここで、分離膜
とは、原水(原液)中の不溶解性物質及び溶解性物質を
分離できる、精密濾過膜、限外濾過膜、或いは逆浸透膜
等の分離膜を言い、分離膜モジュールとは分離膜をモジ
ュール化したものを言う。分離膜の単位膜面積当たりの
処理水量は、その膜の構造、膜質等により一定の数値に
定まっているので、大流量の原水を膜濾過する場合に
は、原水を送水する一台の送水ポンプに対して、原水の
処理水量に応じて、必要個数の分離膜モジュールを並列
配置した水処理装置を構成し、それら分離膜モジュール
を並列通水運転することにより、更には、複数個の分離
膜モジュールをそれぞれ備えたユニットを必要個数並列
配置した水処理装置を構成し、それらユニットを並列通
水運転することにより、所要の処理水量を得ている。更
には、一台の送水ポンプ毎に設けられたそのような水処
理装置の複数を並列配置し、それら水処理装置を並列通
水運転することもある。本明細書では、以下、濾過エレ
メントとして少なくとも1個の分離膜モジュールを有す
るユニットを、分離膜モジュール1個のものも含めて、
便宜上、液体処理ユニットあるいは水処理ユニットと呼
ぶことにする。
2. Description of the Related Art When water is used as raw water, for example, surface water such as lake water, river water, or groundwater such as well water, and industrial water or clean water is to be obtained from the raw water, it is separated as a filtration element. Using a water treatment apparatus equipped with a membrane module, the raw water is filtered to obtain treated water (permeated water) in which insoluble and soluble substances in the raw water have been separated, and this is treated with desired industrial water or water. Often water. Here, the separation membrane refers to a separation membrane such as a microfiltration membrane, an ultrafiltration membrane, or a reverse osmosis membrane capable of separating insoluble and soluble substances in raw water (stock solution). Refers to a modularized separation membrane. The amount of treated water per unit membrane area of the separation membrane is fixed at a certain value depending on the structure, membrane quality, etc. of the membrane. On the other hand, a required number of separation membrane modules are arranged in parallel according to the amount of raw water to be treated, and a water treatment apparatus is arranged in parallel. A required amount of treated water is obtained by constructing a water treatment apparatus in which a required number of units each having a module are arranged in parallel and operating the units in parallel. Further, a plurality of such water treatment devices provided for one water pump may be arranged in parallel, and the water treatment devices may be operated in parallel. In the present specification, hereinafter, a unit having at least one separation membrane module as a filtration element, including a unit having one separation membrane module,
For convenience, it will be referred to as a liquid treatment unit or a water treatment unit.

【0003】ここで、図2を参照しつつ、並列配置した
複数個の、それぞれ少なくとも1個の分離膜モジュール
を有する水処理ユニットをクロスフロー方式濾過型で並
列通水運転する従来の水処理装置の構成を説明する。従
来の水処理装置は、図2に示すように、原水タンク12
から原水を水処理ユニット20に送水する1台の送水ポ
ンプ14と、送水ポンプ14の吐出側に接続された吐出
管16から分岐した複数本(図2では3本のみ図示)の
送水管18A、B、Cと、送水管18A、B、Cにそれ
ぞれ接続され、クロスフロー方式で並列通水運転される
水処理ユニット20A、B、Cとを備えている。一般
に、このような大規模な水処理装置は、種々の自動制御
回路を備えた遠隔監視方式、いわゆる無人自動運転方式
で運転されている。そこで、各送水管18A、B、Cに
それぞれ自動遮断弁22A、B、Cを設けて、ある水処
理ユニット20を緊急に停止する必要のある時に、個別
的に、自動的にかつ即時的に送水管18を遮断して、そ
の水処理ユニット20の運転を停止すると共にその水処
理ユニット20を他の水処理ユニットから隔離するよう
になっている。例えば、分離膜モジュールの膜破断やそ
の他の理由により、水処理ユニット20Aから濾過水と
して流出する処理水の水質が所定の水質より低下した場
合などに、自動遮断弁22Aは、送水管18Aを自動的
にかつ即時的に遮断してその水処理ユニット20Aの運
転を停止し、水処理装置から出る処理水の水質を維持す
るようになっている。尚、各水処理ユニット20の処理
水の水質は、各水処理ユニットの処理水管にそれぞれ設
けられた水質計(図示せず)により測定され、それに連
動して自動遮断弁22が動作する。また、処理水は各水
処理ユニット20A、B、Cから処理水管24を介して
外部に送水され、濃縮水は各水処理ユニット20A、
B、Cから濃縮水管26を介して原水タンク12に戻っ
たり、又は外部に排出されたりする。
Here, referring to FIG. 2, a conventional water treatment apparatus in which a plurality of water treatment units, each having at least one separation membrane module arranged in parallel, is operated in parallel by a cross-flow filtration type. Will be described. As shown in FIG. 2, a conventional water treatment apparatus has a raw water tank 12.
A single water supply pump 14 for supplying raw water to the water treatment unit 20 from a plurality of water supply pipes 18A (only three are shown in FIG. 2) branched from a discharge pipe 16 connected to the discharge side of the water supply pump 14, B, C, and water treatment units 20A, B, and C connected to the water pipes 18A, 18B, and 18C, respectively, and operated in parallel in a cross flow manner. Generally, such a large-scale water treatment apparatus is operated by a remote monitoring method provided with various automatic control circuits, that is, a so-called unmanned automatic operation method. Therefore, automatic shutoff valves 22A, B, and C are provided in each of the water pipes 18A, B, and C to individually, automatically, and immediately when a certain water treatment unit 20 needs to be stopped urgently. The water pipe 18 is shut off, the operation of the water treatment unit 20 is stopped, and the water treatment unit 20 is isolated from other water treatment units. For example, when the quality of the treated water flowing out as filtered water from the water treatment unit 20A falls below a predetermined quality due to a membrane breakage of the separation membrane module or other reasons, the automatic shutoff valve 22A automatically switches the water supply pipe 18A. The operation of the water treatment unit 20A is stopped by shutting down the water treatment unit 20A immediately and immediately, and the quality of the treated water discharged from the water treatment device is maintained. The quality of the treated water of each water treatment unit 20 is measured by a water quality meter (not shown) provided in each of the treated water pipes of each water treatment unit, and the automatic shutoff valve 22 operates in conjunction therewith. The treated water is sent to the outside from each of the water treatment units 20A, B, and C via the treated water pipe 24, and the concentrated water is supplied to each of the water treatment units 20A, 20A.
B and C return to the raw water tank 12 via the concentrated water pipe 26 or are discharged to the outside.

【0004】[0004]

【発明が解決しようとする課題】ところで、送水ポンプ
に使用されているような大容量の水ポンプ、特に遠心ポ
ンプは、ポンプの吐出量が減少すると、ポンプ吐出圧が
上昇するという流量・圧力特性を示す。そこで、図2に
示した従来の水処理装置では、自動遮断弁22のいずれ
かが作動して、水処理装置への原水の流入量が減少し、
送水ポンプの吐出量が低下せざるを得なくなった時、送
水ポンプ14の吐出圧が、通常の運転圧力より上昇し、
各水処理ユニット20での原水供給圧力が水処理ユニッ
トに設けられた分離膜モジュールの許容圧力を超えるこ
とがある。その結果、分離膜の濾過性が悪化したり、或
いは分離膜モジュールの原水側から処理水側に原水が漏
水したりして、処理水の水質が低下し、そのため、自動
遮断弁22が作動して、残りの水処理ユニット20が、
次々に、緊急停止することになる。或いは、分離膜モジ
ュールの許容圧力以上の原水圧力の上昇により、水処理
ユニットが損傷するような事態を招くことになる。
By the way, a large-capacity water pump, particularly a centrifugal pump, used for a water supply pump, has a flow rate / pressure characteristic that when the discharge amount of the pump decreases, the pump discharge pressure increases. Is shown. Therefore, in the conventional water treatment apparatus shown in FIG. 2, one of the automatic shut-off valves 22 is operated to reduce the amount of raw water flowing into the water treatment apparatus,
When the discharge amount of the water pump has to be reduced, the discharge pressure of the water pump 14 rises from the normal operating pressure,
The raw water supply pressure in each water treatment unit 20 may exceed the allowable pressure of the separation membrane module provided in the water treatment unit. As a result, the filterability of the separation membrane is deteriorated, or the raw water leaks from the raw water side to the treated water side of the separation membrane module, and the quality of the treated water is reduced. Therefore, the automatic shut-off valve 22 is operated. And the remaining water treatment unit 20
One after another, an emergency stop will occur. Alternatively, a situation in which the water treatment unit is damaged due to an increase in the raw water pressure exceeding the allowable pressure of the separation membrane module is caused.

【0005】無人自動運転方式を維持しつつ、これを解
決するには、例えば分離膜モジュールの許容圧力を高く
したり、或いは自動遮断弁の作動を検知し、それに連動
するポンプインバータ制御によりポンプの回転数を減少
させてポンプ吐出量を低下させる方法もある。しかし、
これらの方法は、コストが嵩んだり、或いは電気設備及
び計装設備が複雑になって、却ってトラブルが発生した
りして、実用化の点で必ずしも満足できるものでなかっ
た。
In order to solve this problem while maintaining the unmanned automatic operation system, for example, the allowable pressure of the separation membrane module is increased, or the operation of the automatic shutoff valve is detected, and the pump inverter is controlled by the pump inverter control. There is also a method of reducing the pump speed by reducing the number of revolutions. But,
These methods are not always satisfactory in terms of practical application, because the cost is increased, or the electrical equipment and the instrumentation equipment are complicated, causing problems.

【0006】そこで、本発明は、並列通水(通液)運転
されている複数個の分離膜型液体処理ユニットのうちの
いずれかが自動的に運転停止した際に、残りのユニット
が正常な状態で運転できるように、原水(原液)の供給
圧力を簡便にしかも確実に調節できる手段を備えた水処
理装置、すなわち液体処理装置を提供することを目的と
している。
Accordingly, the present invention is directed to a method for automatically stopping the operation of one of a plurality of separation membrane type liquid processing units operating in parallel water flow (liquid flow). It is an object of the present invention to provide a water treatment apparatus provided with a means for easily and surely adjusting the supply pressure of raw water (raw liquid) so that the apparatus can be operated in a state, that is, a liquid treatment apparatus.

【0007】[0007]

【課題を解決するための手段】上記目的を達成するため
に、本発明に係る液体処理装置は、原液を送液する送液
ポンプと、送液ポンプの吐出側に接続した吐出管から分
岐した複数本の送液管にそれぞれ接続され、濾過エレメ
ントとして少なくとも1個の分離膜モジュールを有する
液体処理ユニットと、各液体処理ユニットへの送液をそ
れぞれ個別的にかつ自動的に停止する自動遮断弁とを備
え、一台の送液ポンプにより供給された原液を液体処理
ユニットの並列通液運転により膜濾過して処理液を得る
液体処理装置において、送液ポンプと自動遮断弁との間
の吐出管又は送液管から分岐して設けられ、送液ポンプ
により送液される原液の一部を液体処理ユニット外に送
液する原液逃がし管と、原液逃がし管に設けられた逃が
し弁又は圧力調節弁とを備え、液体処理ユニットへの原
液供給圧力が上昇して弁の作動圧力になったときに、弁
が作動して原液を原液逃がし管を介して液体処理ユニッ
ト外に流出させ、液体処理ユニットへの原液供給圧力を
低下させるようにしたことを特徴としている。
In order to achieve the above object, a liquid processing apparatus according to the present invention comprises a liquid feed pump for feeding a stock solution and a discharge pipe connected to a discharge side of the liquid feed pump. A liquid processing unit connected to each of the plurality of liquid feeding pipes and having at least one separation membrane module as a filtration element; and an automatic shutoff valve for individually and automatically stopping liquid feeding to each liquid processing unit. In a liquid processing apparatus that obtains a processing liquid by performing membrane filtration of a stock solution supplied by one liquid feed pump by a parallel flow operation of a liquid processing unit, a discharge between a liquid feed pump and an automatic shutoff valve is provided. An undiluted solution release pipe, which is provided branching from a pipe or a liquid supply pipe and sends a part of the undiluted liquid sent by the liquid supply pump to the outside of the liquid processing unit, and a relief valve or pressure control provided in the undiluted liquid release pipe When the supply pressure of the stock solution to the liquid processing unit rises to the operating pressure of the valve, the valve is operated to cause the stock solution to flow out of the liquid processing unit via the stock solution release pipe, It is characterized in that the stock solution supply pressure is reduced.

【0008】本発明の液体処理装置は、各液体処理ユニ
ットがそれぞれ1個の分離膜モジュールのみを備えてい
ても良く、また、それぞれ個数が同じ複数個の分離膜モ
ジュールを備えていても良く、また、各液体処理ユニッ
ト毎に分離膜モジュールの個数が個々別々でも良い。ま
た、濾過方式は、デッドエンド方式の全量濾過型でも、
或いはクロスフロー方式でも良く、また原液供給方式
は、一定流量供給方式でも、その他の供給方式でも良
い。また、送液ポンプは、その形式を問わず、遠心ポン
プでも、斜流ポンプでも、軸流ポンプでも良く、また容
積形ポンプにも適用できる。尚、本発明でいう原液は、
代表的には水であるが、必ずしも水に限るものではな
く、広く、膜濾過により処理できる被処理液体を意味す
る。液体処理ユニットへの送液をそれぞれ個別的にかつ
自動的に停止する自動遮断弁は、必ずしも送液管に設け
る必要はなく、各液体処理ユニットに内蔵されていても
良い。本発明で、原液逃がし管を介して液体処理ユニッ
ト外に流出させる流量は、自動遮断弁が作動した液体処
理ユニットへの原液供給量に等しい流量である。原液逃
がし管は、原液の流出量に対応した管径と本数を有し、
送液ポンプと自動遮断弁との間の吐出管又は送液管から
分岐していて、例えば送液ポンプの吸い込み側或いは原
液タンク等に接続されている。逃がし弁及び圧力調節弁
は、弁の一次側の原液圧力が上昇して弁の作動圧力にな
ったときに、弁が開になって弁の一次側から二次側に原
液を流して一次側の原液圧力を弁の作動圧力に低下さ
せ、その後、自動遮断弁が作動した液体処理ユニットが
正常に運転できるようになって該ユニットへの原液の供
給を再開し、これによって弁の一次側の原液圧力が送液
ポンプの通常の運転圧力に低下して弁の作動圧力以下に
なったときに、弁が閉になる。弁の一次側の原液圧力
は、弁の上流側の原液逃がし管内の原液圧力であって、
従って液体処理ユニットへの原液供給圧力にほぼ等し
い。
In the liquid processing apparatus of the present invention, each liquid processing unit may include only one separation membrane module, or may include a plurality of separation membrane modules of the same number. Further, the number of separation membrane modules may be individually different for each liquid processing unit. In addition, even if the filtration system is a dead-end system total volume filtration type,
Alternatively, a cross flow system may be used, and the stock solution supply system may be a constant flow supply system or another supply system. Further, the liquid feed pump may be a centrifugal pump, a mixed flow pump, an axial flow pump, or a positive displacement pump, regardless of the type thereof. Incidentally, the stock solution referred to in the present invention is:
Typically, it is water, but is not necessarily limited to water, and refers to a liquid to be treated which can be broadly treated by membrane filtration. The automatic shut-off valves for individually and automatically stopping the liquid supply to the liquid processing units need not always be provided in the liquid supply pipe, but may be built in each liquid processing unit. In the present invention, the flow rate that flows out of the liquid processing unit through the stock solution release pipe is equal to the flow rate of the stock solution to the liquid processing unit where the automatic shut-off valve has been operated. The stock solution release tube has a tube diameter and number corresponding to the outflow amount of the stock solution,
It branches from a discharge pipe or a liquid supply pipe between the liquid supply pump and the automatic shutoff valve, and is connected to, for example, a suction side of the liquid supply pump or a stock solution tank. The relief valve and the pressure control valve open the valve when the stock solution pressure on the primary side of the valve rises to the operating pressure of the valve, and the stock solution flows from the primary side of the valve to the secondary side and the primary side The stock solution pressure is reduced to the operating pressure of the valve, and thereafter, the liquid processing unit in which the automatic shut-off valve has been operated can be operated normally, and the supply of the stock solution to the unit is resumed. The valve closes when the stock solution pressure drops to the normal operating pressure of the pump and drops below the valve operating pressure. The stock pressure on the primary side of the valve is the stock pressure in the stock relief pipe upstream of the valve,
Therefore, it is almost equal to the stock solution supply pressure to the liquid processing unit.

【0009】本発明で使用する逃がし弁は、弁の一次側
の原液圧力が弁の作動圧力を超えたときに作動して、逃
がし弁の一次側から二次側に所定流量の原液を流し、一
次側の原液圧力を所定圧力にまで低下させるようにした
既知の逃がし弁である。本発明では、逃がし弁が作動す
る作動圧力は、送液ポンプの通常の運転圧力(通常、分
離膜モジュールの常用運転圧力に等しい)以上で、かつ
分離膜モジュールの許容圧力を超えない圧力の範囲に設
定される。通常、機器或いは装置の安全弁として使用さ
れている弁と同じ形式の逃がし弁、例えば、実施例で説
明するようなコイルバネ式の逃がし弁は、圧力に対する
弁の感応性が高いので、弁の一次側の原液圧力が作動圧
力に達した時に、弁が瞬時的に作動して開になり弁の一
次側の原液圧力を低下させ、運転中の液体処理ユニット
を保護する。従って、本発明では、そのような圧力に対
する感応性の高い逃がし弁を使用するのが好ましい。
尚、逃がし弁の構造及び原液逃がし管の接続先によっ
て、二次側の原液圧力が背圧として逃がし弁に作用する
場合もある。このときには、逃がし弁の作動圧力は、逃
がし弁の二次側に背圧が作用しないときに弁が作動する
作動圧力と二次側の原水圧力との和になる。例えば、原
液逃がし管の接続先が送液ポンプの吸い込み側である場
合には、吸い込み側の原液圧力が背圧として逃がし弁の
二次側に作用する。そこで、本発明で言う作動圧力は、
二次側の原液圧力が背圧として逃がし弁の二次側に作用
する時には、逃がし弁の二次側に背圧が作用しないとき
に弁が作動する作動圧力と二次側の原水圧力との和とす
る。但し、通常、原液逃がし管の接続先は、原液タンク
の上部等で大気開放になっている場合が多いので、二次
側の背圧は無視できる。
The relief valve used in the present invention operates when the stock solution pressure on the primary side of the valve exceeds the operating pressure of the valve, and allows a predetermined amount of stock solution to flow from the primary side to the secondary side of the relief valve. This is a known relief valve configured to reduce the stock solution pressure on the primary side to a predetermined pressure. In the present invention, the operating pressure at which the relief valve operates is a range of pressure equal to or higher than the normal operating pressure of the liquid feed pump (usually equal to the normal operating pressure of the separation membrane module) and not exceeding the allowable pressure of the separation membrane module. Is set to Normally, a relief valve of the same type as a valve used as a safety valve of an apparatus or a device, for example, a coil spring type relief valve as described in the embodiment, has a high sensitivity to the pressure, so that the primary side of the valve is used. When the stock solution pressure reaches the operating pressure, the valve is instantaneously operated and opened to reduce the stock solution pressure on the primary side of the valve, thereby protecting the operating liquid processing unit. Therefore, in the present invention, it is preferable to use a relief valve highly sensitive to such pressure.
Depending on the structure of the relief valve and the connection destination of the undiluted solution release pipe, the undiluted solution pressure on the secondary side may act on the relief valve as back pressure. At this time, the operating pressure of the relief valve is the sum of the operating pressure at which the valve operates when no back pressure acts on the secondary side of the relief valve and the raw water pressure on the secondary side. For example, when the connection destination of the stock solution release pipe is on the suction side of the liquid feed pump, the stock solution pressure on the suction side acts on the secondary side of the relief valve as back pressure. Therefore, the working pressure referred to in the present invention is:
When the stock solution pressure on the secondary side acts on the secondary side of the relief valve as back pressure, the operating pressure at which the valve operates when no back pressure acts on the secondary side of the relief valve and the raw water pressure on the secondary side Sum. However, usually, the connection destination of the stock solution release pipe is open to the atmosphere at the upper part of the stock solution tank or the like, so that the back pressure on the secondary side can be ignored.

【0010】本発明で使用する圧力調節弁は、弁の一次
側の原液圧力を測定し、その測定圧力が弁の作動圧力を
超えたとき、原液を弁の一次側から二次側に流して一次
側の圧力を作動圧力に維持するようにした既知の圧力調
節弁である。本発明では、圧力調節弁が作動する作動圧
力は、送液ポンプの通常の運転圧力以上で、かつ分離膜
モジュールの許容圧力を超えない圧力の範囲に設定され
る。圧力調節弁の弁体を駆動して、一次側から二次側に
流れる原液の流量を調整し、一次側の圧力を作動圧力に
調節する弁体の駆動機構は、例えば、ダイアフラム式で
も、アクチュエータ式でも良い。圧力調節弁にフィード
バック制御回路を設け、一次側の原液圧力測定値に基づ
いて、一次側の原液圧力を作動圧力にフィードバック制
御するようにしても良い。
The pressure regulating valve used in the present invention measures the stock solution pressure on the primary side of the valve, and when the measured pressure exceeds the operating pressure of the valve, allows the stock solution to flow from the primary side of the valve to the secondary side. It is a known pressure regulating valve that maintains the primary pressure at the operating pressure. In the present invention, the operating pressure at which the pressure control valve operates is set to a range of a pressure equal to or higher than the normal operating pressure of the liquid feed pump and not exceeding the allowable pressure of the separation membrane module. The drive mechanism of the valve element that drives the valve element of the pressure control valve, adjusts the flow rate of the stock solution flowing from the primary side to the secondary side, and adjusts the primary side pressure to the operating pressure, for example, even with a diaphragm type, an actuator Expressions are fine. A feedback control circuit may be provided in the pressure regulating valve, and the primary stock pressure may be feedback-controlled to the operating pressure based on the primary stock pressure measurement value.

【0011】[0011]

【発明の実施の形態】以下に、添付図面を参照し、実施
例を挙げて、本発明の実施の形態を具体的かつ詳細に説
明する。なお、以下の例では本発明を水処理に適用した
例について説明する。実施例 本実施例は、図2に示した水処理装置に本発明を適用し
た例で、図1は本実施例の水処理装置(液体処理装置)
の構成を示すフローシートである。本実施例の水処理装
置10は、図2に示した従来の水処理装置の構成に加え
て、更に、図1に示すように、吐出管16から分岐し
て、原水を原水タンク12に戻す原水逃がし管28と、
原水逃がし管28に設けられた逃がし弁30とからなる
原水圧力上昇防止機構を備えていて、水処理ユニット2
0A、B、Cのいずれかの緊急停止時に、残りの水処理
ユニット20に送水する原水の圧力が逃がし弁30の作
動圧力以上に上昇しないようになっている。
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings by way of examples. In the following example, an example in which the present invention is applied to water treatment will be described. Embodiment This embodiment is an example in which the present invention is applied to the water treatment apparatus shown in FIG. 2, and FIG. 1 is a water treatment apparatus (liquid treatment apparatus) of this embodiment.
2 is a flow sheet showing the configuration of FIG. The water treatment apparatus 10 of the present embodiment is configured such that, in addition to the structure of the conventional water treatment apparatus shown in FIG. 2, the raw water is returned from the discharge pipe 16 to the raw water tank 12 as shown in FIG. Raw water escape pipe 28,
A raw water pressure rise prevention mechanism including a relief valve 30 provided in the raw water release pipe 28 is provided.
At the time of emergency stop of any one of 0A, B, and C, the pressure of the raw water to be sent to the remaining water treatment units 20 does not rise above the operating pressure of the relief valve 30.

【0012】逃がし弁30は、自動遮断弁22のいずれ
かが作動して、1台の水処理ユニット20を停止させ、
吐出管16の原水圧力が逃がし弁30の作動圧力にまで
上昇した時、停止した水処理ユニットに流入する原水流
入量に等しい流量の原水を原水逃がし管28を介して吐
出管16から原水タンク12に逃がし、吐出管16の原
水圧力を逃がし弁30の作動圧力と等しい圧力に低下さ
せる、既知の機構の逃がし弁である。逃がし弁30が作
動する作動圧力は、前述のごとく、送水ポンプ14の通
常の運転圧力以上で、かつ水処理ユニット20の分離膜
モジュールの許容圧力を超えない圧力の範囲に設定され
ている。逃がし弁30は、例えば、逃がし弁の一次側か
ら二次側に原水を流過させるポートと、ポートを開閉す
る弁体と、所定のバネ圧力で弁体をポートに対して押圧
してポートを閉にしているバネ(コイルバネ等)とを備
え、逃がし弁の一次側の原水圧力と二次側の原水圧力の
差がバネの押圧力を超えた時に、弁体がポートから離隔
してポートが開き、原水を一次側から二次側に流過させ
て、一次側の原水圧力を低下させるようにしている。本
実施例では、原水逃がし管28が原水タンク12の上部
で大気開放されているので、二次側の原水圧力は、大気
圧か或いは大気圧に近い圧力であって、一次側に比べて
低いので、実用的には二次側の原水圧力を無視できる。
本実施例で逃がし弁30として使用した弁は、株式会社
ベン製のサーキット弁又は一次圧力調整弁と言われるも
のである。
The relief valve 30 stops one of the water treatment units 20 when one of the automatic shut-off valves 22 operates,
When the raw water pressure in the discharge pipe 16 rises to the operating pressure of the relief valve 30, raw water having a flow rate equal to the amount of raw water flowing into the stopped water treatment unit is discharged from the discharge pipe 16 through the raw water release pipe 28 to the raw water tank 12. This is a relief valve of a known mechanism that reduces the raw water pressure in the discharge pipe 16 to a pressure equal to the operating pressure of the relief valve 30. As described above, the operating pressure at which the relief valve 30 operates is set to a range of not less than the normal operating pressure of the water pump 14 and not exceeding the allowable pressure of the separation membrane module of the water treatment unit 20. The relief valve 30 is, for example, a port that allows raw water to flow from the primary side to the secondary side of the relief valve, a valve body that opens and closes the port, and a valve body that presses the valve body against the port with a predetermined spring pressure to open the port. When the difference between the raw water pressure on the primary side and the raw water pressure on the secondary side of the relief valve exceeds the pressing force of the spring, the valve is separated from the port and the port is closed. Opening, the raw water is allowed to flow from the primary side to the secondary side so as to reduce the raw water pressure on the primary side. In this embodiment, since the raw water release pipe 28 is open to the atmosphere above the raw water tank 12, the raw water pressure on the secondary side is at or near atmospheric pressure, and is lower than that on the primary side. Therefore, the raw water pressure on the secondary side can be practically ignored.
The valve used as the relief valve 30 in this embodiment is a circuit valve or a primary pressure regulating valve manufactured by Ben Co., Ltd.

【0013】また、逃がし弁30に代えて、図1(a)
に示すように、原水逃がし管28に圧力調節弁32を設
けても良い。圧力調節弁32は、その圧力計34が直接
原水逃がし管28の一次側の原水圧力を測定し、弁の二
次側の原水圧力とは無関係に、測定値が弁の作動圧力よ
り高いときに作動して、一次側の原水圧力を作動圧力以
下に維持する。本実施例で、圧力調節弁32が作動する
作動圧力は、送水ポンプ14の通常の運転圧力以上で、
かつ水処理ユニット20の分離膜モジュールの許容圧力
を超えない圧力の範囲に設定されている。
Further, in place of the relief valve 30, FIG.
As shown in (1), a pressure regulating valve 32 may be provided in the raw water release pipe 28. The pressure regulating valve 32 has a pressure gauge 34 which measures the raw water pressure directly on the primary side of the raw water relief pipe 28 and, regardless of the raw water pressure on the secondary side of the valve, when the measured value is higher than the operating pressure of the valve. Operate to maintain the primary side raw water pressure below the operating pressure. In this embodiment, the operating pressure at which the pressure control valve 32 operates is equal to or higher than the normal operating pressure of the water supply pump 14,
In addition, the pressure is set within a range not exceeding the allowable pressure of the separation membrane module of the water treatment unit 20.

【0014】本実施例では、水処理ユニット20A、
B、Cのいずれかの緊急停止時、例えば水処理ユニット
20Aの分離膜が破断して処理水の水質が所定レベルよ
り低下し、自動遮断弁22Aが自動的に閉となり、送水
ポンプ14の吐出圧が上昇したとき、上述の原水圧力の
上昇防止機構を備えることにより、逃がし弁30が作動
して所定の流量を原水逃がし管28を介して送水ポンプ
14の吐出側から原水タンク12に返す。これにより、
水処理ユニット20Aの緊急停止時、送水ポンプ14の
吐出圧が上昇して、水処理ユニット20B、Cに設けら
れた分離膜モジュールの許容圧力を超えるようなことが
生じない。よって、残りの水処理ユニット20B、Cの
処理水の水質が、原水側から処理水側にへの原水の漏水
等により低下し、そのために水処理ユニット20B、C
の運転も停止せざるを得なくなったり、或いは水処理ユ
ニット20B、Cが損傷したりする、従来の水処理装置
で生じていた問題を防止することができる。
In this embodiment, the water treatment unit 20A,
At the time of emergency stop of either B or C, for example, the separation membrane of the water treatment unit 20A is broken and the quality of the treated water falls below a predetermined level, the automatic shutoff valve 22A is automatically closed, and the discharge of the water pump 14 is stopped. When the pressure rises, the relief valve 30 operates to return a predetermined flow rate to the raw water tank 12 from the discharge side of the water supply pump 14 via the raw water release pipe 28 by providing the above-described raw water pressure rise prevention mechanism. This allows
At the time of emergency stop of the water treatment unit 20A, the discharge pressure of the water supply pump 14 does not increase and exceeds the allowable pressure of the separation membrane module provided in the water treatment units 20B and 20C. Therefore, the quality of the treated water of the remaining water treatment units 20B and 20C is reduced due to leakage of the raw water from the raw water side to the treated water side, and therefore, the water treatment units 20B and C
Can be prevented, or the water treatment units 20B and 20B can be damaged.

【0015】[0015]

【発明の効果】本発明の構成によれば、原水(原液)圧
力上昇防止機構として、逃がし弁又は圧力調節弁を備え
た原液逃がし管を吐出管又は送液管から分岐することに
より、並列通液運転のいずれかの液体処理ユニットの緊
急停止時、送液ポンプの吐出圧が上昇して液体処理ユニ
ットに設けられた分離膜モジュールの許容圧力を超えな
いようにしている。これにより、本発明は、停止した液
体処理ユニット以外の運転中の液体処理ユニットへの原
液供給圧力が分離膜モジュールの許容圧力を超えないの
で、それら液体処理ユニットの処理液の液質が、原液側
から処理液側への原液の液漏れ等により低下し、そのた
めにそれら液体処理ユニットの運転を停止せざるを得な
くなったり、或いは液体処理ユニットが損傷したりする
ことを防止している。よって、残りの液体処理ユニット
は正常に運転できる。更に、本発明の液体処理装置で設
ける原液圧力上昇防止機構は、圧力に対する感応性が高
く、液体処理ユニットへの原液供給圧力の上昇に対して
瞬時的に対応し、しかも極く簡便な機構なので、誤動作
がなく、経済的である。
According to the structure of the present invention, as a raw water (raw liquid) pressure rise preventing mechanism, a raw liquid relief pipe provided with a relief valve or a pressure control valve is branched from a discharge pipe or a liquid feed pipe to form a parallel flow. At the time of emergency stop of any liquid processing unit in the liquid operation, the discharge pressure of the liquid feed pump is increased so as not to exceed the allowable pressure of the separation membrane module provided in the liquid processing unit. Thus, according to the present invention, since the supply pressure of the undiluted solution to the operating liquid processing units other than the stopped liquid processing unit does not exceed the allowable pressure of the separation membrane module, the quality of the undiluted processing solution in these liquid processing units is reduced. It is reduced by the leakage of the undiluted solution from the side to the processing liquid side, so that the operation of the liquid processing units must be stopped or the liquid processing units are prevented from being damaged. Therefore, the remaining liquid processing units can operate normally. Furthermore, the undiluted solution pressure rise prevention mechanism provided in the liquid processing apparatus of the present invention has high sensitivity to pressure, instantaneously responds to an increase in undiluted solution supply pressure to the liquid processing unit, and is a very simple mechanism. It is economical without malfunction.

【図面の簡単な説明】[Brief description of the drawings]

【図1】図1は本発明に係る液体処理装置の実施例1の
構成を示すフローシート、及び図1(a)は実施例の1
の一部改変例の構成を示すフローシートである。
FIG. 1 is a flow sheet showing a configuration of a liquid processing apparatus according to a first embodiment of the present invention, and FIG.
6 is a flow sheet showing a configuration of a partially modified example of the above.

【図2】従来の水処理装置の構成を示すフローシートで
ある。
FIG. 2 is a flow sheet showing a configuration of a conventional water treatment apparatus.

【符号の説明】[Explanation of symbols]

10 本発明に係る水処理装置の実施例 12 原水タンク 14 送水ポンプ 16 吐出管 18 送水管 20 水処理ユニット 22 自動遮断弁 24 処理水管 26 濃縮水管 28 原水逃がし管 30 逃がし弁 32 圧力調節弁 34 圧力計 DESCRIPTION OF SYMBOLS 10 Example of the water treatment apparatus which concerns on this invention 12 Raw water tank 14 Water supply pump 16 Discharge pipe 18 Water supply pipe 20 Water treatment unit 22 Automatic shut-off valve 24 Treatment water pipe 26 Concentrated water pipe 28 Raw water relief pipe 30 Release valve 32 Pressure control valve 34 Pressure Total

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 原液を送液する送液ポンプと、送液ポン
プの吐出側に接続した吐出管から分岐した複数本の送液
管にそれぞれ接続され、濾過エレメントとして少なくと
も1個の分離膜モジュールを有する液体処理ユニット
と、各液体処理ユニットへの送液をそれぞれ個別的にか
つ自動的に停止する自動遮断弁とを備え、一台の送液ポ
ンプにより供給された原液を液体処理ユニットの並列通
液運転により膜濾過して処理液を得る液体処理装置にお
いて、 送液ポンプと自動遮断弁との間の吐出管又は送液管から
分岐して設けられ、送液ポンプにより送液される原液の
一部を液体処理ユニット外に送液する原液逃がし管と、 原液逃がし管に設けられた逃がし弁又は圧力調節弁とを
備え、 液体処理ユニットへの原液供給圧力が上昇して弁の作動
圧力になったときに、弁が作動して原液を原液逃がし管
を介して液体処理ユニット外に流出させ、液体処理ユニ
ットへの原液供給圧力を低下させるようにしたことを特
徴とする液体処理装置。
At least one separation membrane module serving as a filtration element connected to a liquid feed pump for feeding a stock solution and a plurality of liquid feed pipes branched from a discharge pipe connected to a discharge side of the liquid feed pump. A liquid processing unit, and an automatic shut-off valve that individually and automatically stops liquid supply to each liquid processing unit. In a liquid processing apparatus that obtains a processing liquid by membrane filtration by a liquid passing operation, a stock solution that is provided branching from a discharge pipe or a liquid feeding pipe between a liquid feeding pump and an automatic shutoff valve and is sent by the liquid feeding pump. And a relief valve or a pressure control valve provided on the stock solution release tube, and the operating pressure of the valve increases when the stock solution supply pressure to the liquid processing unit increases. To The liquid processing apparatus is characterized in that, when it becomes, the valve is actuated to cause the undiluted solution to flow out of the liquid processing unit through the undiluted solution release pipe, thereby reducing the undiluted solution supply pressure to the liquid processing unit.
JP31899696A 1996-11-29 1996-11-29 Liquid treating device Pending JPH10156147A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31899696A JPH10156147A (en) 1996-11-29 1996-11-29 Liquid treating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31899696A JPH10156147A (en) 1996-11-29 1996-11-29 Liquid treating device

Publications (1)

Publication Number Publication Date
JPH10156147A true JPH10156147A (en) 1998-06-16

Family

ID=18105341

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31899696A Pending JPH10156147A (en) 1996-11-29 1996-11-29 Liquid treating device

Country Status (1)

Country Link
JP (1) JPH10156147A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001293418A (en) * 2000-04-11 2001-10-23 Dainippon Printing Co Ltd Coating device
JP2011224465A (en) * 2010-04-20 2011-11-10 Miura Co Ltd Pure water producing system
JP2013133951A (en) * 2011-12-26 2013-07-08 Daikin Industries Ltd Humidity controller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001293418A (en) * 2000-04-11 2001-10-23 Dainippon Printing Co Ltd Coating device
JP2011224465A (en) * 2010-04-20 2011-11-10 Miura Co Ltd Pure water producing system
JP2013133951A (en) * 2011-12-26 2013-07-08 Daikin Industries Ltd Humidity controller

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