JPH09313902A - Chemical cleaning method for immersion type ceramic membrane separation device - Google Patents
Chemical cleaning method for immersion type ceramic membrane separation deviceInfo
- Publication number
- JPH09313902A JPH09313902A JP8132475A JP13247596A JPH09313902A JP H09313902 A JPH09313902 A JP H09313902A JP 8132475 A JP8132475 A JP 8132475A JP 13247596 A JP13247596 A JP 13247596A JP H09313902 A JPH09313902 A JP H09313902A
- Authority
- JP
- Japan
- Prior art keywords
- chemical
- solution
- chemical cleaning
- ceramic
- cleaning method
- 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
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Cleaning In General (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、浄水、下水、し
尿、産業廃水等を処理する水処理、および汚泥の濃縮、
菌体分離、海水淡水化などを行う浸漬型セラミック膜分
離装置の逆洗方法に関する。TECHNICAL FIELD The present invention relates to water treatment for treating purified water, sewage, human waste, industrial wastewater, etc., and sludge concentration,
The present invention relates to a backwashing method for a submerged ceramic membrane separator for separating bacterial cells and desalting seawater.
【０００２】[0002]
【従来の技術】従来、浄水、下水、し尿、産業廃水等を
処理する水処理、および汚泥の濃縮、菌体分離、海水淡
水化などを行う水処理装置として、処理槽内の被処理水
に浸漬して設けられる浸漬型セラミック膜分離装置が知
られている。2. Description of the Related Art Conventionally, as a water treatment device for treating purified water, sewage, human waste, industrial wastewater, etc., and for sludge concentration, bacterial cell separation, seawater desalination, etc. An immersion type ceramic membrane separation device provided by immersion is known.
【０００３】浸漬型膜分離装置は、たとえば、複数本の
管状セラミック分離膜を配列した膜モジュールを複数段
積層し、各セラミック分離膜の透過水流路に連通する透
過水吸引管を設け、膜モジュールの下方に散気装置を設
けており、透過水吸引管を介して透過水流路内に吸引圧
を作用させることによって、セラミック分離膜により被
処理水を濾過し、膜面を透過して透過水流路内に流入し
た透過水を透過水吸引管を通じて槽外へ取り出すととも
に、散気装置からの気泡流によってセラミック分離膜の
表面を洗浄するようにしている。The submerged membrane separation device is, for example, a stack of a plurality of membrane modules in which a plurality of tubular ceramic separation membranes are arranged, and a permeated water suction pipe communicating with the permeated water flow path of each ceramic separation membrane is provided. An air diffuser is installed below the filter, and by applying suction pressure to the permeate flow path through the permeate suction pipe, the water to be treated is filtered by the ceramic separation membrane and permeated through the membrane surface. The permeated water that has flowed into the passage is taken out of the tank through the permeated water suction pipe, and the surface of the ceramic separation membrane is cleaned by the bubble flow from the air diffuser.
【０００４】そして、セラミック分離膜の表面や内部に
スケールやスライムなどが付着し、濾過性能が低下して
きた時に、セラミック分離膜の透過水流路に濾過時とは
逆方向に薬液を圧送することにより、セラミック分離膜
を薬品洗浄するようにしている。When scale or slime adheres to the surface or inside of the ceramic separation membrane and the filtration performance is deteriorated, the chemical solution is pressure-fed to the permeate flow passage of the ceramic separation membrane in the direction opposite to the filtration. , The ceramic separation membrane is cleaned with chemicals.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、スケー
ルやスライムなどはセラミック分離膜に均一に付着する
わけではないので、濾過性能が低下してから薬品洗浄を
行うと、スケールやスライムなどの付着が少ない部分で
は薬液が浸透し易く、付着が多い部分では濾過抵抗が大
きく薬液が浸透しにくいため、均等に薬品洗浄がなされ
ず、洗浄効果が低い場合がある。However, since scale and slime do not adhere uniformly to the ceramic separation membrane, if the chemical cleaning is carried out after the filtration performance is lowered, the adhesion of scale and slime will be small. The chemical solution easily penetrates in the portion, and the chemical solution does not easily permeate in the portion where there is a large amount of adhesion, so that the chemical cleaning may not be performed uniformly and the cleaning effect may be low.
【０００６】本発明は上記問題を解決するもので、セラ
ミック分離膜を効果的に洗浄できる浸漬型セラミック膜
分離装置の薬品洗浄方法を提供することを目的とするも
のである。The present invention solves the above problems, and an object of the present invention is to provide a chemical cleaning method for an immersion ceramic membrane separation apparatus which can effectively clean the ceramic separation membrane.
【０００７】[0007]
【課題を解決するための手段】上記問題を解決するため
に、本発明の請求項１記載の浸漬型セラミック膜分離装
置の薬品洗浄方法は、セラミック分離膜の透過水流路に
濾過時とは逆方向に薬液を圧送してセラミック分離膜を
薬品洗浄する浸漬型セラミック膜分離装置の薬品洗浄方
法において、薬品洗浄を１週間に１回から６か月に１回
の間隔で行うようにしたものである。In order to solve the above problems, the chemical cleaning method for an immersion type ceramic membrane separation apparatus according to claim 1 of the present invention is the reverse of the filtration method in the permeated water channel of the ceramic separation membrane. In the chemical cleaning method of the immersion type ceramic membrane separation device in which the chemical liquid is pumped in the direction to clean the ceramic separation membrane with chemicals, the chemical cleaning is performed at intervals of once a week to once every 6 months. is there.
【０００８】請求項２記載の浸漬型セラミック膜分離装
置の薬品洗浄方法は、セラミック分離膜の透過水流路内
に薬液を３０分間から２４時間保持するようにしたもの
である。The chemical cleaning method of the immersion type ceramic membrane separation device according to the second aspect is such that the chemical liquid is held in the permeated water passage of the ceramic separation membrane for 30 minutes to 24 hours.
【０００９】請求項３記載の浸漬型セラミック膜分離装
置の薬品洗浄方法は、薬品洗浄を酸化剤溶液、酸あるい
は塩基の溶液、および還元剤溶液の内の少なくとも２種
類の薬液により多段階的に行うようにしたものである。According to a third aspect of the present invention, there is provided a chemical cleaning method for a submerged ceramic membrane separation apparatus, wherein the chemical cleaning is carried out in a multi-step manner using at least two kinds of chemical solutions selected from an oxidizing agent solution, an acid or base solution, and a reducing agent solution. It's something that you do.
【００１０】請求項４記載の浸漬型セラミック膜分離装
置の薬品洗浄方法は、薬液として、有効塩素濃度５００
〜１００００ｍｇ／ｌの次亜塩素酸ナトリウム水溶液、
塩素水、または二酸化塩素水である酸化剤溶液を用いる
ようにしたものである。According to a fourth aspect of the present invention, there is provided a chemical cleaning method for a submerged ceramic membrane separation device, wherein an effective chlorine concentration is 500 as a chemical liquid.
10000 mg / l sodium hypochlorite aqueous solution,
An oxidant solution which is chlorine water or chlorine dioxide water is used.
【００１１】請求項５記載の浸漬型セラミック膜分離装
置の薬品洗浄方法は、薬液として、５００〜１００００
ｍｇ／ｌの塩酸、硫酸、硝酸、シュウ酸水溶液、クエン
酸水溶液、または水酸化ナトリウム水溶液である酸ある
いは塩基の溶液を用いるようにしたものである。According to a fifth aspect of the present invention, there is provided a chemical cleaning method for an immersion type ceramic membrane separation apparatus, wherein the chemical solution is 500 to 10,000.
A solution of an acid or a base which is a mg / l hydrochloric acid, sulfuric acid, nitric acid, oxalic acid aqueous solution, citric acid aqueous solution, or sodium hydroxide aqueous solution is used.
【００１２】請求項６記載の浸漬型セラミック膜分離装
置の薬品洗浄方法は、薬液として、５００〜１００００
ｍｇ／ｌの亜硫酸酸ナトリウム水溶液、重亜硫酸ナトリ
ウム水溶液、またはチオ硫酸ナトリウム水溶液である還
元剤溶液を用いるようにしたものである。According to a sixth aspect of the present invention, there is provided a chemical cleaning method for a submerged ceramic membrane separation device, wherein the chemical liquid is 500 to 10,000.
A reducing agent solution which is a mg / l sodium sulfite aqueous solution, a sodium bisulfite aqueous solution, or a sodium thiosulfate aqueous solution is used.
【００１３】上記した請求項１記載の構成によれば、洗
浄間隔を１週間に１回から６か月に１回としたので、セ
ラミック分離膜にスケールやスライムなどがほとんど付
着していない時点で薬品洗浄することになり、セラミッ
ク分離膜のいずれの部分でも均等に薬液が浸透し、効果
的に薬品洗浄がなされる。According to the above-mentioned structure of the present invention, the cleaning interval is from once a week to once every 6 months, so that when the scale or slime is hardly attached to the ceramic separation membrane. Since chemical cleaning is performed, the chemical liquid evenly permeates any portion of the ceramic separation membrane, and chemical cleaning is effectively performed.
【００１４】請求項２記載の構成によれば、薬液を３０
分間から２４時間保持することにより、化学反応のため
の時間が確保されるので、セラミック分離膜が効果的に
洗浄される。According to the structure of claim 2, 30
Holding from 24 minutes to 24 hours ensures the time for the chemical reaction, so that the ceramic separation membrane is effectively cleaned.
【００１５】請求項３記載の構成によれば、薬品洗浄を
少なくとも２種類の薬液により多段階的に行うことによ
り、セラミック分離膜がより効果的に洗浄される。請求
項４記載の構成によれば、適当濃度の酸化剤溶液で薬品
洗浄を行うようにしたため、分離膜に付着した主として
有機物を好適に除去できる。According to the third aspect of the present invention, the ceramic separation membrane is more effectively cleaned by performing the chemical cleaning in multiple stages with at least two kinds of chemicals. According to the structure described in claim 4, since the chemical cleaning is performed with the oxidant solution having an appropriate concentration, mainly the organic substances attached to the separation membrane can be suitably removed.
【００１６】請求項５記載の構成によれば、適当濃度の
酸あるいは塩基の溶液で薬品洗浄を行うようにしたた
め、分離膜に付着した無機物や有機物を好適に除去でき
る。請求項６記載の構成によれば、適当濃度の還元剤溶
液で薬品洗浄を行うようにしたため、酸化剤溶液で薬品
洗浄した後の酸化剤の影響を排除できる。According to the fifth aspect of the invention, since the chemical cleaning is performed with a solution of an acid or a base having an appropriate concentration, it is possible to preferably remove the inorganic substances and organic substances attached to the separation membrane. According to the configuration of claim 6, since the chemical cleaning is performed with the reducing agent solution having an appropriate concentration, the influence of the oxidizing agent after the chemical cleaning with the oxidizing agent solution can be eliminated.
【００１７】[0017]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１および図２は、本発明の浸漬
型セラミック膜分離装置の薬品洗浄方法が行われる水処
理装置の全体構成を示した説明図である。このような水
処理装置はたとえば、河川水、湖沼水、地下水、海水な
どを処理する浄水処理、および下水、し尿、産業廃水な
どを処理する活性汚泥処理において用いられるものであ
り、ポリ塩化アルミニウム（ＰＡＣ）、硫酸バンド、塩
化第二鉄、ポリ硫酸第二鉄（ポリ鉄）などの凝集剤を添
加する処理においても用いられる。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are explanatory views showing the overall configuration of a water treatment device in which the chemical cleaning method for an immersion ceramic membrane separation device of the present invention is performed. Such a water treatment device is used, for example, in water purification treatment for treating river water, lake water, groundwater, seawater, etc., and activated sludge treatment for treating sewage, night soil, industrial wastewater, etc. PAC), sulfuric acid band, ferric chloride, and polyferric sulfate (polyiron).
【００１８】図１において、１は被処理水供給管２より
被処理水が供給される処理槽であり、槽内の被処理水に
浸漬して外圧型の膜分離装置３を設け、膜分離装置３の
下方に、被処理水に曝気空気を供給するブロワ４に接続
した曝気装置５を設けている。処理槽１の底部には、余
剰汚泥を引き抜く汚泥引抜管１ａが設けられている。In FIG. 1, reference numeral 1 denotes a treatment tank to which the treated water is supplied from a treated water supply pipe 2, which is immersed in the treated water in the tank to provide an external pressure type membrane separation device 3 for membrane separation. An aeration device 5 connected to a blower 4 that supplies aeration air to the water to be treated is provided below the device 3. At the bottom of the treatment tank 1, a sludge extraction pipe 1a for extracting excess sludge is provided.
【００１９】膜分離装置３は、複数本の管状セラミック
分離膜により膜モジュールを構成し、この膜モジュール
を複数段積層するとともに、セラミック分離膜の内側す
なわち透過水流路に連通する透過水吸引管６を設けてい
る。透過水吸引管６はコントロール弁７および吸引ポン
プ８を備え、槽外の処理水槽９に導かれていて、吸引ポ
ンプ８の吸引負圧を透過水吸引管６を通して膜分離装置
３の分離膜の内側に作用させ、吸引負圧によりセラミッ
ク分離膜を透過した透過水を処理水槽９に送るようにな
っている。The membrane separation device 3 constitutes a membrane module with a plurality of tubular ceramic separation membranes, and the membrane modules are laminated in a plurality of stages, and the permeated water suction pipe 6 communicating with the inside of the ceramic separation membrane, that is, the permeated water flow path. Is provided. The permeated water suction pipe 6 is equipped with a control valve 7 and a suction pump 8 and is guided to a treated water tank 9 outside the tank so that the negative suction pressure of the suction pump 8 passes through the permeated water suction pipe 6 to separate the separation membrane of the membrane separation device 3. The permeated water which is made to act on the inside and permeated through the ceramic separation membrane by suction negative pressure is sent to the treated water tank 9.
【００２０】処理水槽９は、逆洗ポンプ１０とコントロ
ール弁１１とを備えた逆洗水供給管１２を設けていて、
逆洗水供給管１２を通して、槽内に貯留された透過水を
膜分離装置３の分離膜の内側に圧送できるようになって
いる。逆洗水供給管１２の管路には薬品槽１３から導か
れた薬注管１４が開口していて、薬注ポンプ１５により
薬品槽１３内の薬品を逆洗水供給管１２に送り込むよう
になっている。The treated water tank 9 is provided with a backwash water supply pipe 12 equipped with a backwash pump 10 and a control valve 11.
Through the backwash water supply pipe 12, the permeated water stored in the tank can be pressure fed to the inside of the separation membrane of the membrane separation device 3. A chemical injection pipe 14 guided from the chemical tank 13 is opened in the pipeline of the backwash water supply pipe 12, and the chemical in the chemical tank 13 is sent to the backwash water supply pipe 12 by the chemical injection pump 15. Has become.
【００２１】このような水処理装置を運転する時は、コ
ントロール弁７を開くとともにコントロール弁１１を閉
じ、被処理水供給管２より処理槽１に被処理水を導入す
る状態において、吸引ポンプ８を駆動する。そして、こ
の吸引ポンプ８の吸引負圧を吸引管６を通じて膜分離装
置３の分離膜の内側に作用させ、槽１内の被処理水を分
離膜により濾過して、被処理水中の濁質を槽内に残留さ
せるとともに、分離膜を透過した透過水を取り出して吸
引管６により処理水槽９に送る。またこのとき、ブロワ
ー４より曝気装置５を通じて曝気空気を供給し、被処理
水の上向流を生起して膜分離装置３に向けて供給するこ
とにより、分離膜の膜面を洗浄する。そして、分離効率
の低下を防止するために適宜、膜分離装置３の逆洗を行
う。When operating such a water treatment device, the suction pump 8 is opened in a state where the control valve 7 is opened and the control valve 11 is closed, and the treated water is introduced from the treated water supply pipe 2 into the treatment tank 1. To drive. Then, the suction negative pressure of the suction pump 8 is applied to the inside of the separation membrane of the membrane separation device 3 through the suction pipe 6, and the water to be treated in the tank 1 is filtered by the separation membrane to remove turbidity in the water to be treated. While remaining in the tank, the permeated water that has permeated the separation membrane is taken out and sent to the treated water tank 9 through the suction pipe 6. At this time, aeration air is supplied from the blower 4 through the aeration device 5 to generate an upward flow of the water to be treated and supply it to the membrane separation device 3 to wash the membrane surface of the separation membrane. Then, the backwashing of the membrane separation device 3 is appropriately performed in order to prevent a decrease in separation efficiency.
【００２２】以下、膜分離装置の逆洗方法を説明する。
処理槽１への被処理水の導入を中止し、コントロール弁
７を閉じるとともに吸引ポンプ８を停止させて、膜分離
装置３による濾過を停止する。そして、コントロール弁
１１を開き、逆洗ポンプ１０を作動させて、処理水槽９
内に貯留された透過水を逆洗水供給管１２により膜分離
装置３の分離膜の内側に圧送しつつ、曝気空気により生
起される被処理水の上向流を膜分離装置３に供給するこ
とにより、分離膜に形成された付着層などを剥離する。The method for backwashing the membrane separation device will be described below.
The introduction of the water to be treated into the treatment tank 1 is stopped, the control valve 7 is closed, the suction pump 8 is stopped, and the filtration by the membrane separation device 3 is stopped. Then, the control valve 11 is opened, the backwash pump 10 is operated, and the treated water tank 9
The permeated water stored inside is pumped to the inside of the separation membrane of the membrane separation device 3 by the backwash water supply pipe 12, and the upward flow of the water to be treated generated by the aerated air is supplied to the membrane separation device 3. By doing so, the adhesion layer and the like formed on the separation film are peeled off.
【００２３】そして、このようにして濾過の間に透過水
による逆洗を適宜行いながら、適当洗浄間隔で薬品洗浄
を行う。薬品洗浄を行う時は、薬注ポンプ１５を駆動
し、逆洗水供給管１２内を圧送される透過水に薬品槽１
３内の薬品を注入して、適当濃度の薬液を調製する。そ
して、この薬液を分離膜の内側に送り込んで、膜の内側
から外側へ浸透させることにより、膜への付着物を化学
的に除去する。Thus, chemical washing is performed at appropriate washing intervals while appropriately performing backwashing with permeated water during filtration. When chemical cleaning is performed, the chemical pump 15 is driven and the permeated water pumped through the backwash water supply pipe 12 is supplied with the chemical tank 1.
The chemical in 3 is injected to prepare a chemical solution with an appropriate concentration. Then, this chemical solution is fed into the inside of the separation membrane and permeated from the inside to the outside of the membrane to chemically remove the deposits on the membrane.
【００２４】薬品洗浄は、被処理水の性状に応じて１週
間に１回〜６か月に１回程度、分離膜にスケールやスラ
イムなどがほとんど付着していない時点で行えばよく、
これにより、分離膜のいずれの部分でも均等に薬液が浸
透し、効果的に薬品洗浄がなされる。その際、分離膜の
透過水流路内に薬液を３０分間から２４時間保持すれば
よく、これにより、化学反応のための時間が確保され、
分離膜がさらに効果的に洗浄される。The chemical cleaning may be carried out once a week to once every 6 months, depending on the nature of the water to be treated, at a time when almost no scale or slime is attached to the separation membrane,
As a result, the chemical liquid evenly penetrates into any part of the separation membrane, and the chemical cleaning is effectively performed. At that time, the chemical solution may be held in the permeated water channel of the separation membrane for 30 minutes to 24 hours, whereby the time for the chemical reaction is secured,
The separation membrane is washed more effectively.
【００２５】薬品としては、次亜塩素酸ナトリウム溶
液、塩素水、二酸化塩素水などの酸化剤、あるいは塩
酸、硫酸、硝酸、シュウ酸、クエン酸または水酸化ナト
リウムなどの酸または塩基を用いることができる。酸化
剤の場合は有効塩素濃度約５００〜１００００ｍｇ／
ｌ、好ましくは約５００〜１０００ｍｇ／ｌの透過水中
濃度となるように添加し、酸または塩基の場合は５００
〜１００００ｍｇ／ｌの透過水中濃度となるように添加
する。As the chemical, an oxidizing agent such as sodium hypochlorite solution, chlorine water, chlorine dioxide water, or an acid or base such as hydrochloric acid, sulfuric acid, nitric acid, oxalic acid, citric acid or sodium hydroxide is used. it can. In case of oxidizer, effective chlorine concentration is about 500 to 10,000 mg /
l, preferably about 500 to 1000 mg / l in permeate concentration, added in the case of acid or base 500
Add so that the concentration of permeated water is 10000 mg / l.
【００２６】以下、図２を用いて、本発明の他の実施形
態を説明する。図２に示した水処理装置は図１を用いて
説明した水処理装置とほぼ同じなので、同一構成および
同一作用を有する装置および部材に同じ符号を付してそ
の説明を省略する。ただし、逆洗水供給管１２の管路に
さらに薬品槽２６から導かれた薬注管２７が開口してい
て、薬品槽２６内の薬品を薬注ポンプ２８により逆洗水
供給管１２に送り込むようになっている。Another embodiment of the present invention will be described below with reference to FIG. Since the water treatment apparatus shown in FIG. 2 is almost the same as the water treatment apparatus described with reference to FIG. 1, the same reference numerals are given to the apparatuses and members having the same configurations and functions, and the description thereof will be omitted. However, a chemical injection pipe 27 led from the chemical tank 26 is further opened in the pipeline of the backwash water supply pipe 12, and the chemical in the chemical tank 26 is sent to the backwash water supply pipe 12 by a chemical injection pump 28. It is like this.
【００２７】図２に示した水処理装置において、第１工
程において、逆洗水供給管１２内を流れる透過水に、薬
注管１４より薬品槽１３内の薬品、たとえば次亜塩素酸
ナトリウム溶液である酸化剤を注入し、適当濃度となっ
た酸化剤溶液を分離膜の内側に圧送して薬品洗浄を行
う。次いで、第２工程において、透過水のみで分離膜を
逆洗し、分離膜の内側に残留している酸化剤を分離膜の
外側へ押し出す。これにより、濾過を再開したときも、
酸化剤は非常に希薄な溶液として流入するのみとなり、
この水処理装置の後段において、酸化剤に弱いＲＯ膜を
設けた膜分離装置などを使用する処理も可能となる。In the water treatment apparatus shown in FIG. 2, in the first step, the permeated water flowing in the backwash water supply pipe 12 is supplied with a chemical in the chemical tank 13 from the chemical injection pipe 14, for example, a sodium hypochlorite solution. Is injected, and the oxidant solution having an appropriate concentration is pressure-fed to the inside of the separation membrane for chemical cleaning. Next, in the second step, the separation membrane is backwashed only with permeated water, and the oxidizing agent remaining inside the separation membrane is pushed out to the outside of the separation membrane. With this, even when the filtration is restarted,
The oxidant only comes in as a very dilute solution,
In the latter stage of this water treatment device, it is possible to perform treatment using a membrane separation device provided with an RO membrane which is weak against an oxidant.
【００２８】または、図２に示した水処理装置におい
て、たとえば、薬品槽１３内に次亜塩素酸ナトリウム溶
液である酸化剤、薬品槽２６内に重亜硫酸ナトリウム溶
液である還元剤を入れておく。そして、第１工程におい
て、逆洗水供給管１２内を流れる透過水に薬注管１４よ
り薬品槽１３内の酸化剤を注入し、適当濃度となった酸
化剤溶液を分離膜の内側に圧送することにより薬品洗浄
を行う。Alternatively, in the water treatment apparatus shown in FIG. 2, for example, an oxidizing agent which is a sodium hypochlorite solution is put in the chemical tank 13 and a reducing agent which is a sodium bisulfite solution is put in the chemical tank 26. . Then, in the first step, the oxidant in the chemical tank 13 is injected into the permeated water flowing in the backwash water supply pipe 12 through the chemical injection pipe 14, and the oxidant solution having an appropriate concentration is pumped to the inside of the separation membrane. To perform chemical cleaning.
【００２９】その後、第２工程において、薬注ポンプ１
５を停止させて薬注ポンプ２８を駆動し、薬品槽２６内
の還元剤を薬注管２７より逆洗水供給管１２に注入し、
適当濃度となった還元剤溶液を分離膜の内側に圧送する
ことにより薬品洗浄を行う。Then, in the second step, the chemical injection pump 1
5, the chemical injection pump 28 is driven, and the reducing agent in the chemical tank 26 is injected from the chemical injection pipe 27 into the backwash water supply pipe 12.
Chemical cleaning is performed by sending a reducing agent solution having an appropriate concentration to the inside of the separation membrane under pressure.
【００３０】これにより、分離膜の内部や内側に残留し
ている酸化剤を還元剤の作用により失活させ、透過水に
よる逆洗を行うことなく酸化剤の影響を排除できる。ま
たは、図２に示した水処理装置において、たとえば、薬
品槽１３内に塩酸、薬品槽２６内に次亜塩素酸ナトリウ
ム溶液を入れておく。そして、第１工程において、薬品
槽１３内の塩酸により適当時間薬品洗浄を行って無機物
を除去し、その後、薬品槽２６内の次亜塩素酸ナトリウ
ム溶液により適当時間薬品洗浄を行って有機物を除去す
る。次いで、第２工程において、透過水のみで分離膜を
逆洗し、次亜塩素酸ナトリウムを分離膜の外側へ押し出
してその影響を排除する。As a result, the oxidizing agent remaining inside or inside the separation membrane is deactivated by the action of the reducing agent, and the effect of the oxidizing agent can be eliminated without backwashing with permeated water. Alternatively, in the water treatment apparatus shown in FIG. 2, for example, hydrochloric acid is put in the chemical tank 13 and sodium hypochlorite solution is put in the chemical tank 26. Then, in the first step, chemical cleaning is performed with hydrochloric acid in the chemical tank 13 for an appropriate time to remove inorganic substances, and then chemical cleaning is performed with a sodium hypochlorite solution in the chemical tank 26 for an appropriate time to remove organic substances. To do. Next, in the second step, the separation membrane is backwashed only with permeated water, and sodium hypochlorite is extruded to the outside of the separation membrane to eliminate the effect.
【００３１】または、上記した第１工程における薬品洗
浄の順序を変えて、次亜塩素酸ナトリウム溶液による薬
品洗浄を行った後に、塩酸溶液による薬品洗浄を行って
もよい。Alternatively, the order of the chemical cleaning in the above-mentioned first step may be changed, chemical cleaning with a sodium hypochlorite solution may be performed, and then chemical cleaning with a hydrochloric acid solution may be performed.
【００３２】または、上記した第２工程において、透過
水で分離膜を逆洗する代わりに、重亜硫酸ナトリウムな
どの還元剤溶液で分離膜を逆洗して、次亜塩素酸ナトリ
ウム酸化剤を失活させてもよい。Alternatively, in the above-mentioned second step, instead of backwashing the separation membrane with permeated water, the separation membrane is backwashed with a reducing agent solution such as sodium bisulfite to remove the sodium hypochlorite oxidizing agent. You may activate it.
【００３３】また、上記においては、透過水に薬品を注
入して薬液を調製したが、薬品槽内に予め調製した薬液
を入れておき、この薬液を膜分離装置に圧送して薬品洗
浄を行ってもよいことは言うまでもない。また、上記に
おいては、管状セラミック分離膜により構成された外圧
型膜分離装置を用いたが、この逆洗方法を平膜型膜分離
装置や内圧型膜分離装置に適用してもよい。Further, in the above, the chemical liquid was prepared by injecting the chemical into the permeated water. However, the chemical liquid prepared in advance is put in the chemical tank, and the chemical liquid is pressure-fed to the membrane separation device to perform the chemical cleaning. It goes without saying that it is okay. Further, in the above, the external pressure type membrane separation device composed of the tubular ceramic separation membrane was used, but this backwashing method may be applied to a flat membrane type membrane separation device or an internal pressure type membrane separation device.
【００３４】[0034]
【発明の効果】以上のように本発明によれば、薬品洗浄
間隔を１週間に１回から６か月に１回として、セラミッ
ク分離膜にスケールやスライムなどがほとんど付着して
いない時点で薬品洗浄するようにしたことにより、セラ
ミック分離膜のいずれの部分にも均等に薬液を浸透させ
ることができ、セラミック分離膜を一様に洗浄できる。
したがって、セラミック分離膜を配列した膜モジュー
ル、または膜モジュールを積層した膜分離装置全体を処
理槽の外部に取り出す必要はなく、処理槽の内部に設置
した状態で膜分離装置を半永久的に運転できる。As described above, according to the present invention, the chemical cleaning interval is once a week to once every 6 months, and the chemical is removed at the time when almost no scale or slime adheres to the ceramic separation membrane. By cleaning the ceramic separation membrane, the chemical solution can be uniformly permeated into any part of the ceramic separation membrane, and the ceramic separation membrane can be uniformly cleaned.
Therefore, it is not necessary to take out the membrane module in which the ceramic separation membranes are arranged or the entire membrane separation apparatus in which the membrane modules are laminated to the outside of the processing tank, and the membrane separation apparatus can be operated semipermanently in the state of being installed inside the processing tank. .
【００３５】このとき、セラミック分離膜の透過水流路
に薬液を３０分間から２４時間保持することにより、化
学反応のための時間を確保するようにしたので、これに
よっても薬品洗浄効果を高めることができる。また、薬
品洗浄を少なくとも２種類の薬液により多段階的に行う
ことによっても、セラミック分離膜をより効果的に洗浄
できる。At this time, since the chemical solution is kept in the permeated water channel of the ceramic separation membrane for 30 minutes to 24 hours to secure the time for the chemical reaction, this also enhances the chemical cleaning effect. it can. Also, the ceramic separation membrane can be more effectively cleaned by performing the chemical cleaning in multiple stages with at least two kinds of chemicals.
【図１】本発明の一実施形態の浸漬型セラミック膜分離
装置の薬品洗浄方法が行われる水処理装置の全体構成を
示した説明図である。FIG. 1 is an explanatory diagram showing an overall configuration of a water treatment device in which a chemical cleaning method for an immersion ceramic membrane separation device according to an embodiment of the present invention is performed.
【図２】本発明の他の実施形態の浸漬型セラミック膜分
離装置の薬品洗浄方法が行われる水処理装置の全体構成
を示した説明図である。FIG. 2 is an explanatory diagram showing an overall configuration of a water treatment device in which a chemical cleaning method for an immersion ceramic membrane separation device according to another embodiment of the present invention is performed.
１ 処理槽 ３ 膜分離装置 13 薬品槽 26 薬品槽 1 treatment tank 3 membrane separator 13 chemical tank 26 chemical tank
───────────────────────────────────────────────────── フロントページの続き (72)発明者 尾崎 俊也 大阪府大阪市西淀川区西島２丁目１番地６ 号 株式会社クボタ新淀川工場内 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Toshiya Ozaki 2-1-1, Nishijima, Nishiyodogawa-ku, Osaka-shi, Osaka Inside Kubota Shin-Yodogawa Plant
Claims (6)
とは逆方向に薬液を圧送してセラミック分離膜を薬品洗
浄する浸漬型セラミック膜分離装置の薬品洗浄方法にお
いて、薬品洗浄を１週間に１回から６か月に１回の間隔
で行うことを特徴とする浸漬型セラミック膜分離装置の
薬品洗浄方法。1. A chemical cleaning method for a submerged ceramic membrane separation apparatus in which a chemical solution is pressure-fed to a permeated water flow path of a ceramic separation membrane in a direction opposite to that at the time of filtration to clean the ceramic separation membrane with chemicals for one week. A chemical cleaning method for an immersion type ceramic membrane separation device, which is performed once to every 6 months.
を３０分間から２４時間保持することを特徴とする請求
項１記載の浸漬型セラミック膜分離装置の薬品洗浄方
法。2. The chemical cleaning method for an immersion ceramic membrane separation apparatus according to claim 1, wherein the chemical solution is held in the permeated water channel of the ceramic separation membrane for 30 minutes to 24 hours.
の溶液、および還元剤溶液の内の少なくとも２種類の薬
液により多段階的に行うことを特徴とする請求項１また
は請求項２のいずれかに記載の浸漬型セラミック膜分離
装置の薬品洗浄方法。3. The method according to claim 1, wherein the chemical cleaning is carried out in a multi-step manner by using at least two kinds of chemical solutions selected from an oxidizing agent solution, an acid or base solution, and a reducing agent solution. 7. A chemical cleaning method for an immersion ceramic membrane separation device according to claim 2.
０００ｍｇ／ｌの次亜塩素酸ナトリウム水溶液、塩素
水、または二酸化塩素水である酸化剤溶液を用いること
を特徴とする請求項１から請求項３のいずれかに記載の
浸漬型セラミック膜分離装置の薬品洗浄方法。4. A chemical solution having an effective chlorine concentration of 500 to 10
The immersing type ceramic membrane separation device according to any one of claims 1 to 3, wherein an oxidizer solution that is 000 mg / l sodium hypochlorite aqueous solution, chlorine water, or chlorine dioxide water is used. Chemical cleaning method.
ｌの塩酸、硫酸、硝酸、シュウ酸水溶液、クエン酸水溶
液、または水酸化ナトリウム水溶液である酸あるいは塩
基の溶液を用いることを特徴とする請求項１から請求項
３のいずれかに記載の浸漬型セラミック膜分離装置の薬
品洗浄方法。5. A drug solution of 500 to 10,000 mg /
4. The immersion type according to claim 1, wherein a solution of an acid or a base, which is 1 hydrochloric acid, sulfuric acid, nitric acid, an aqueous solution of oxalic acid, an aqueous solution of citric acid, or an aqueous solution of sodium hydroxide, is used. Chemical cleaning method for ceramic membrane separator.
ｌの亜硫酸酸ナトリウム水溶液、重亜硫酸ナトリウム水
溶液、またはチオ硫酸ナトリウム水溶液である還元剤溶
液を用いることを特徴とする請求項１から請求項３のい
ずれかに記載の浸漬型セラミック膜分離装置の薬品洗浄
方法。6. A drug solution of 500 to 10,000 mg /
4. The chemical agent for a submerged ceramic membrane separation device according to claim 1, wherein a reducing agent solution which is an aqueous solution of sodium sulfite, an aqueous solution of sodium bisulfite, or an aqueous solution of sodium thiosulfate is used. Cleaning method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8132475A JPH09313902A (en) | 1996-05-28 | 1996-05-28 | Chemical cleaning method for immersion type ceramic membrane separation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8132475A JPH09313902A (en) | 1996-05-28 | 1996-05-28 | Chemical cleaning method for immersion type ceramic membrane separation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09313902A true JPH09313902A (en) | 1997-12-09 |
Family
ID=15082248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8132475A Pending JPH09313902A (en) | 1996-05-28 | 1996-05-28 | Chemical cleaning method for immersion type ceramic membrane separation device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09313902A (en) |
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