JP2000334275A - Pretreatment method of cellulose acetate membrane - Google Patents
Pretreatment method of cellulose acetate membraneInfo
- Publication number
- JP2000334275A JP2000334275A JP11151783A JP15178399A JP2000334275A JP 2000334275 A JP2000334275 A JP 2000334275A JP 11151783 A JP11151783 A JP 11151783A JP 15178399 A JP15178399 A JP 15178399A JP 2000334275 A JP2000334275 A JP 2000334275A
- Authority
- JP
- Japan
- Prior art keywords
- cellulose acetate
- membrane
- acetate membrane
- water
- contact
- 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
- 229920002301 cellulose acetate Polymers 0.000 title claims abstract description 35
- 239000012528 membrane Substances 0.000 title claims description 66
- 238000002203 pretreatment Methods 0.000 title claims description 11
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000460 chlorine Substances 0.000 claims abstract description 30
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 30
- -1 compound salt Chemical class 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000007864 aqueous solution Substances 0.000 claims description 13
- 239000003906 humectant Substances 0.000 claims description 11
- 239000012510 hollow fiber Substances 0.000 claims description 9
- 238000000108 ultra-filtration Methods 0.000 claims description 5
- 150000005846 sugar alcohols Polymers 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 42
- 238000001914 filtration Methods 0.000 description 10
- 239000000126 substance Substances 0.000 description 9
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 239000005708 Sodium hypochlorite Substances 0.000 description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 6
- 230000035699 permeability Effects 0.000 description 6
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 235000011187 glycerol Nutrition 0.000 description 3
- 229940058015 1,3-butylene glycol Drugs 0.000 description 2
- 235000019437 butane-1,3-diol Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 2
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical class [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical class OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical class Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、運転初期における
透水性能の低下を抑制するために有効な酢酸セルロース
未使用膜の前処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pretreating a cellulose acetate-free membrane, which is effective for suppressing a decrease in water permeability at an early stage of operation.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】酢酸セ
ルロース膜は親水性膜であり、膜面のゼータ電位が負で
あることから、負に帯電している被濾過物質が静電反発
を受けて付着しにくく、目詰まりが起こりにくいことが
知られている。そして、原水が天然水の場合はほとんど
の懸濁物質が負に帯電していることから、目詰まりの抑
制が期待できる。2. Description of the Related Art A cellulose acetate membrane is a hydrophilic membrane and has a negative zeta potential on the membrane surface, so that a negatively charged substance to be filtered is subject to electrostatic repulsion. It is known that they are hardly adhered and clogging hardly occurs. When the raw water is natural water, most of the suspended substances are negatively charged, so that clogging can be suppressed.
【０００３】しかし、未使用の酢酸セルロース膜を用い
て河川水等を浄化する際、運転開始から数日のうちに透
水速度が著しく低下してしまう現象が度々みられる。そ
のため、運転開始時から一定期間は一時的に透水速度を
下げて運転を行ったり、特開平７−３２８６２３号公報
のように、濾過圧力を暫時下げて運転を行ったりせざる
を得ず、その期間は十分な透水速度が得られないという
問題がある。[0003] However, when purifying river water or the like using an unused cellulose acetate membrane, there is often observed a phenomenon that the water permeation rate is remarkably reduced within a few days from the start of operation. Therefore, for a certain period of time from the start of operation, it is necessary to temporarily lower the water permeation rate to operate, or to temporarily lower the filtration pressure to operate as in JP-A-7-328623. There is a problem that a sufficient water permeability cannot be obtained during the period.
【０００４】このような使用開始から一定期間の透水速
度の著しい低下は、膜面に保湿剤が残存していることに
起因するものと推定される。未使用の酢酸セルロース膜
には、膜の性能及び構造を維持するために、通常、グリ
セリン、ジエチレングリコール、トリエチレングリコー
ル、１，３−ブチレングリコール等の多価アルコール系
保湿剤が膜面に付着されている。この保湿剤は、通常は
使用前に純水で洗浄除去するが、純水では完全に除去す
ることは困難である。そのため、膜面に残存した保湿剤
により膜面の物理的及び化学的特性が変化してしまい、
目詰まりが生じ易くなり、これが上記したような運転初
期における透水速度の低下を引き起こすものと考えられ
る。[0004] Such a remarkable decrease in the water permeation rate for a certain period from the start of use is presumed to be due to the humectant remaining on the membrane surface. In order to maintain the performance and structure of the unused cellulose acetate membrane, a polyhydric alcohol humectant such as glycerin, diethylene glycol, triethylene glycol or 1,3-butylene glycol is usually adhered to the membrane surface. ing. This humectant is usually washed and removed with pure water before use, but it is difficult to completely remove it with pure water. Therefore, the physical and chemical properties of the film surface are changed by the humectant remaining on the film surface,
It is considered that clogging is likely to occur, which causes a decrease in the water permeation rate in the initial operation as described above.
【０００５】このように目詰まりした酢酸セルロース膜
の透水性能を回復させるためには、特開平８−１４１３
７５号公報に記載されているように、薬品で洗浄しなけ
ればならず、多大な労力とコストを要してしまう。In order to recover the water permeability of the cellulose acetate membrane clogged as described above, Japanese Patent Application Laid-Open No. 8-1413 discloses a method.
As described in Japanese Patent Publication No. 75-75, cleaning with a chemical is required, which requires a great deal of labor and cost.
【０００６】本発明は、未使用の酢酸セルロース膜を用
いて濾過運転する際、運転開始における透水性能の低下
を抑制し、透水性能の低下を防止できる酢酸セルロース
膜の前処理方法を提供することを目的とする。An object of the present invention is to provide a method for pretreating a cellulose acetate membrane capable of suppressing a decrease in water permeability at the start of operation and preventing a decrease in water permeability when a filtration operation is performed using an unused cellulose acetate membrane. With the goal.
【０００７】[0007]
【課題を解決するための手段】本発明は、酢酸セルロー
ス膜と塩素系化合物塩水溶液とを接触させる前処理方法
であり、前記接触における塩素系化合物塩水溶液の有効
塩素濃度が２０〜１０００ｍｇ／Ｌで、有効塩素濃度と
接触時間との積が１００〜５０００ｍｇ／Ｌ・ｈｒであ
る酢酸セルロース膜の前処理方法を提供する。The present invention relates to a pretreatment method for bringing a cellulose acetate membrane into contact with an aqueous solution of a chlorine-based compound salt, wherein the effective chlorine concentration of the aqueous solution of a chlorine-based compound salt in the contact is 20 to 1000 mg / L. The present invention provides a method for pretreating a cellulose acetate membrane, wherein the product of the effective chlorine concentration and the contact time is 100 to 5000 mg / L · hr.
【０００８】[0008]
【発明の実施の形態】本発明の前処理方法においては、
酢酸セルロース膜と塩素系化合物塩水溶液とを接触させ
る際に、下記の２つの要件を具備するように接触させ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the pretreatment method of the present invention,
When the cellulose acetate membrane is brought into contact with the aqueous solution of a chlorine-based compound salt, the contact is made so as to satisfy the following two requirements.
【０００９】まず、塩素系化合物塩水溶液の濃度が、有
効塩素濃度が２０〜１０００ｍｇ／Ｌ、好ましくは５０
〜５００ｍｇ／Ｌとなるようにして接触させる。有効塩
素濃度が２０ｍｇ／Ｌ以上であると十分な接触効果を付
与することができ、１０００ｍｇ／Ｌ以下であると酢酸
セルロース膜の加水分解による劣化が防止できる。First, the concentration of the aqueous solution of the chlorine compound salt is adjusted so that the effective chlorine concentration is 20 to 1000 mg / L, preferably 50 mg / L.
The contact is made so as to be ~ 500 mg / L. When the effective chlorine concentration is 20 mg / L or more, a sufficient contact effect can be provided, and when the effective chlorine concentration is 1000 mg / L or less, deterioration of the cellulose acetate membrane due to hydrolysis can be prevented.
【００１０】また、有効塩素濃度と接触時間との積が、
１００〜５０００ｍｇ／Ｌ・ｈｒ、好ましくは５００〜
３０００ｍｇ／Ｌ・ｈｒとなるようにして接触させる。
有効塩素濃度と接触時間との積が１００ｍｇ／Ｌ・ｈｒ
以上であると十分な接触効果を付与することができ、５
０００ｍｇ／Ｌ・ｈｒ以下であると酢酸セルロース膜の
加水分解による劣化を防止できる。Also, the product of the effective chlorine concentration and the contact time is
100 to 5000 mg / L · hr, preferably 500 to
The contact is made at 3000 mg / L · hr.
The product of the effective chlorine concentration and the contact time is 100 mg / L · hr
With the above, a sufficient contact effect can be provided, and 5
When the content is 000 mg / L · hr or less, degradation of the cellulose acetate membrane due to hydrolysis can be prevented.
【００１１】本発明の前処理方法は、未使用状態の酢酸
セルロース膜に対して適用されるものであり、未使用状
態であれば適用時期は限定されない。適用対象となる酢
酸セルロース膜の構造は特に限定されず、例えば中空糸
膜にすることができ、膜の種類も特に限定されず、例え
ば限外濾過膜、逆浸透膜、ナノ濾過膜、精密濾過膜にす
ることができる。また、本発明の前処理方法は、特に保
湿剤としてグリセリン、ジエチレングリコール、トリエ
チレングリコール、１，３−ブチレングリコール等の多
価アルコールを含んでいる膜に対して有効である。The pretreatment method of the present invention is applied to an unused cellulose acetate membrane, and the application time is not limited as long as it is unused. The structure of the cellulose acetate membrane to be applied is not particularly limited, and may be, for example, a hollow fiber membrane, and the type of the membrane is not particularly limited. For example, ultrafiltration membrane, reverse osmosis membrane, nanofiltration membrane, microfiltration Can be a membrane. Further, the pretreatment method of the present invention is particularly effective for a membrane containing a polyhydric alcohol such as glycerin, diethylene glycol, triethylene glycol, 1,3-butylene glycol as a humectant.
【００１２】本発明の前処理方法における酢酸セルロー
ス膜と塩素系化合物塩水溶液との接触方法は、例えば、
酢酸セルロース膜自体を塩素系化合物塩水溶液中に浸漬
する方法を適用することができるが、実用上の観点から
は、酢酸セルロース膜を組み込んだ膜モジュールに対し
て、塩素系化合物塩水溶液を接触させる方法が好まし
い。The method for contacting the cellulose acetate membrane with the aqueous solution of a chlorine compound salt in the pretreatment method of the present invention includes, for example,
A method of immersing the cellulose acetate membrane itself in an aqueous solution of a chlorine-based compound salt can be applied, but from a practical viewpoint, the aqueous solution of a chlorine-based compound salt is brought into contact with a membrane module incorporating a cellulose acetate membrane. The method is preferred.
【００１３】このような膜モジュールとの接触方法とし
ては、膜モジュールを塩素系化合物塩水溶液中に浸漬し
た後、純水で洗浄する方法、膜モジュールの原水の供給
側又は透過水側から塩素系化合物塩水溶液を圧入して放
置した後、塩素系化合物塩水溶液を放流し、純水にて洗
浄する方法等を適用することができる。これらの方法で
用いる純水は、例えば水道水を逆浸透膜や限外濾過膜で
処理したものを使用することができる。As a method for contacting with the membrane module, a method in which the membrane module is immersed in an aqueous solution of a chlorine compound salt and then washed with pure water, or a method in which the chlorine module is supplied from the raw water supply side or permeated water side of the membrane module. After the compound salt aqueous solution is press-fitted and allowed to stand, a method in which the chlorine-based compound salt aqueous solution is discharged and washed with pure water can be applied. Pure water used in these methods may be, for example, tap water treated with a reverse osmosis membrane or an ultrafiltration membrane.
【００１４】本発明で用いる塩素系化合物塩としては、
塩素酸塩、亜塩素酸塩、次亜塩素酸塩等が挙げられ、塩
型としては、アルカリ金属塩、アルカリ土類金属塩等が
挙げられる。これらの中でも、次亜塩素酸ナトリウムが
好ましい。The chlorine compound salts used in the present invention include:
Chlorates, chlorites, hypochlorites and the like are listed, and examples of the salt type include alkali metal salts and alkaline earth metal salts. Among these, sodium hypochlorite is preferred.
【００１５】本発明の前処理方法を適用することによ
り、処理後の酢酸セルロース膜表面の親水性が高めら
れ、さらに目詰まりがしにくくなる。また、酢酸セルロ
ース膜が保湿剤を含有している場合には、保湿剤が完全
に洗浄除去されるため、残存保湿剤に起因する膜面の物
理的及び化学的特性の変化を防止できる。By applying the pretreatment method of the present invention, the hydrophilicity of the surface of the cellulose acetate membrane after the treatment is enhanced, and clogging is hardly caused. Further, when the cellulose acetate film contains a humectant, the humectant is completely washed and removed, so that a change in physical and chemical properties of the film surface due to the remaining humectant can be prevented.
【００１６】本発明の前処理方法を適用した酢酸セルロ
ース膜は、河川、湖沼、雨水、地下水及び海水等の天然
水に対する浄化処理用膜として好適であり、そのほかに
も工場及び生活排水等の処理にも利用することができ
る。The cellulose acetate membrane to which the pretreatment method of the present invention has been applied is suitable as a membrane for purifying natural waters such as rivers, lakes, marshes, rainwater, groundwater and seawater. Can also be used.
【００１７】[0017]
【実施例】以下、実施例により本発明をさらに詳しく説
明するが、本発明はこれらにより限定されるものではな
い。EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.
【００１８】実施例１ 図１に示す水処理システムに組み込んだ酢酸セルロース
製の中空糸膜モジュール１２に対して本発明の前処理方
法を適用した後、濾過運転を行い、透過性能を試験し
た。なお、中空糸膜として、膜内径０．８ｍｍ、外径
１．３ｍｍで、分画分子量１５万の限外濾過膜を用い、
一つの膜モジュール１２の膜面積は０．１４ｍ2とし
た。また、保湿剤としてグリセリンが１６ｍｇ／ｃｍ2
の割合で膜面に付着していた。Example 1 After applying the pretreatment method of the present invention to the hollow fiber membrane module 12 made of cellulose acetate incorporated in the water treatment system shown in FIG. 1, a filtration operation was performed to test the permeation performance. As the hollow fiber membrane, an ultrafiltration membrane having a membrane inner diameter of 0.8 mm, an outer diameter of 1.3 mm, and a molecular weight cut off of 150,000 was used.
The membrane area of one membrane module 12 was 0.14 m 2 . Also, glycerin as a humectant was 16 mg / cm 2.
% Of the film was attached to the film surface.
【００１９】薬液タンク１７内の次亜塩素酸ナトリウム
水溶液（有効塩素濃度１００ｍｇ／Ｌ、温度２３℃）
を、ポンプ１８により、中空糸膜モジュール１２の透過
水側から注入してモジュール内に満たした後、室温で２
０時間放置した（有効塩素濃度と接触時間との積は２０
００ｍｇ／Ｌ・ｈｒ）。その後、次亜塩素酸ナトリウム
水溶液を中空糸膜モジュール１２から放流して、薬液タ
ンク１７に返送した。その後、水道水を限外濾過膜処理
した純水により、中空糸膜の透過側から原水側に、１分
間、５０ｋＰａの水圧で透過させて膜モジュール１２内
を洗浄した。An aqueous solution of sodium hypochlorite in the chemical solution tank 17 (effective chlorine concentration 100 mg / L, temperature 23 ° C.)
Is injected from the permeated water side of the hollow fiber membrane module 12 by the pump 18 and filled in the module, and then is injected at room temperature.
Left for 0 hours (the product of the effective chlorine concentration and the contact time is 20
00 mg / L · hr). Thereafter, the aqueous sodium hypochlorite solution was discharged from the hollow fiber membrane module 12 and returned to the chemical solution tank 17. Thereafter, tap water was passed through the ultrafiltration membrane treated with pure water from the permeation side of the hollow fiber membrane to the raw water side at a water pressure of 50 kPa for 1 minute to wash the inside of the membrane module 12.
【００２０】このようにして前処理をした後、濾過運転
を行った。まず、揖保川下流域の河川水を原水として採
取し、ポンプ１１により各中空糸膜モジュール１２に供
給し、濾過した後、透過水は透過水タンク１４に送液し
た。濾過運転は、濾過圧力が５０ｋＰａで、クロスフロ
ー線速が０．２ｍ／ｓｅｃで行い、３０分間隔で１分
間、透過水による逆洗浄を透過水の回収率９０％で行っ
た。After the pretreatment as described above, a filtration operation was performed. First, the river water in the lower reaches of the Ibo River was collected as raw water, supplied to each hollow fiber membrane module 12 by the pump 11, filtered, and then the permeated water was sent to the permeated water tank 14. The filtration operation was performed at a filtration pressure of 50 kPa and a cross flow linear velocity of 0.2 m / sec, and backwashing with permeated water was performed at 30 minute intervals for 1 minute at a permeated water recovery rate of 90%.
【００２１】このような濾過運転における透水速度の経
日変化を測定した。透水速度は単位時間当たりの透過水
の量から求めた。結果を図２に示す。The daily change of the water permeation rate in such a filtration operation was measured. The water permeation rate was determined from the amount of permeated water per unit time. The results are shown in FIG.
【００２２】実施例２ 次亜塩素酸ナトリウム水溶液の有効塩素濃度を５００ｍ
ｇ／Ｌ（温度２３℃）とし、接触時間を４時間とした
（有効塩素濃度と接触時間との積は２０００ｍｇ／Ｌ・
ｈｒ）以外は実施例１と同様にして前処理し、濾過運転
を行った。結果を図２に示す。Example 2 The effective chlorine concentration of the aqueous sodium hypochlorite solution was 500 m
g / L (temperature 23 ° C.) and the contact time was 4 hours (the product of the effective chlorine concentration and the contact time was 2000 mg / L ·
Except for hr), a pretreatment was performed in the same manner as in Example 1, and a filtration operation was performed. The results are shown in FIG.
【００２３】比較例１ 次亜塩素酸ナトリウム水溶液による前処理を行わなかっ
た以外は実施例１と同様にして、濾過運転を行った。結
果を図２に示す。Comparative Example 1 A filtration operation was performed in the same manner as in Example 1 except that the pretreatment with the aqueous sodium hypochlorite solution was not performed. The results are shown in FIG.
【００２４】比較例２ 次亜塩素酸ナトリウム水溶液の有効塩素濃度を１０ｍｇ
／Ｌ（温度２３℃）とし、接触時間を６時間とした（有
効塩素濃度と接触時間との積は６０ｍｇ／Ｌ・ｈｒ）以
外は実施例１と同様にして前処理し、濾過運転を行っ
た。結果を図２に示す。Comparative Example 2 The effective chlorine concentration of the aqueous sodium hypochlorite solution was 10 mg.
/ L (temperature 23 ° C.) and the contact time was set to 6 hours (the product of the effective chlorine concentration and the contact time was 60 mg / L · hr), and the pretreatment was performed in the same manner as in Example 1, and the filtration operation was performed. Was. The results are shown in FIG.
【００２５】図２から明らかなとおり、実施例１、２と
比較例１、２とを比べると、運転開始から約１月間の透
水速度の低下に差が認められた。また、有効塩素濃度と
接触時間との積が同一の実施例１と実施例２は、ほぼ同
じ透水速度を維持しており、有効塩素濃度と接触時間と
の関係が、酢酸セルロース膜の透水性能を維持するため
の定量的指標となることが確認された。As is apparent from FIG. 2, when Examples 1 and 2 were compared with Comparative Examples 1 and 2, a difference was observed in the decrease in water permeation rate for about one month from the start of operation. In Example 1 and Example 2 in which the product of the effective chlorine concentration and the contact time were the same, the water permeation rate was maintained substantially the same, and the relationship between the effective chlorine concentration and the contact time was determined by the water permeation performance of the cellulose acetate membrane. It was confirmed that it could be a quantitative index for maintaining.
【００２６】[0026]
【発明の効果】本発明の前処理方法を適用した酢酸セル
ロース膜は、運転開始から数日〜数週間にわたって透水
性能の低下が抑制される。したがって、運転初期におい
て透水速度を低下させて運転する必要がなく、運転初期
における透水速度の低下による不都合が解消される。さ
らに、保湿剤のより積極的な使用が可能となるので、膜
の物理的及び化学的特性の保護という点からも優れてい
る。The cellulose acetate membrane to which the pretreatment method of the present invention has been applied suppresses a decrease in water permeability over several days to several weeks from the start of operation. Therefore, there is no need to operate at a reduced water permeation speed in the early stage of operation, and the inconvenience due to the reduced water permeation speed in the initial stage of operation is eliminated. Furthermore, since the humectant can be used more aggressively, it is excellent in protecting the physical and chemical properties of the membrane.
【図１】 酢酸セルロース膜モジュールを組み込んだ水
処理システムの概念図である。FIG. 1 is a conceptual diagram of a water treatment system incorporating a cellulose acetate membrane module.
【図２】 実施例及び比較例の膜モジュールにおける透
水速度の経日変化を示す図である。FIG. 2 is a diagram showing a daily change of a water permeation rate in membrane modules of an example and a comparative example.
１０、１９ 逆止弁 １１、１５、１８ ポンプ １２ 中空糸膜モジュール １３、１６、２０ 自動弁 １４ 透過水タンク １７ 薬液タンク 10, 19 Check valve 11, 15, 18 Pump 12 Hollow fiber membrane module 13, 16, 20 Automatic valve 14 Permeated water tank 17 Chemical liquid tank
Claims (4)
液とを接触させる前処理方法であり、前記接触における
塩素系化合物塩水溶液の有効塩素濃度が２０〜１０００
ｍｇ／Ｌで、有効塩素濃度と接触時間との積が１００〜
５０００ｍｇ／Ｌ・ｈｒである酢酸セルロース膜の前処
理方法。1. A pretreatment method comprising bringing a cellulose acetate membrane into contact with an aqueous solution of a chlorine-based compound salt, wherein the effective chlorine concentration of the aqueous solution of a chlorine-based compound salt in the contact is 20 to 1000.
mg / L, the product of the effective chlorine concentration and the contact time is 100 to
A method for pretreating a cellulose acetate membrane at 5000 mg / L · hr.
項１記載の酢酸セルロース膜の前処理方法。2. The method for pretreating a cellulose acetate membrane according to claim 1, wherein the cellulose acetate membrane is a hollow fiber membrane.
求項１又は２記載の酢酸セルロース膜の前処理方法。3. The method for pretreating a cellulose acetate membrane according to claim 1, wherein the cellulose acetate membrane is an ultrafiltration membrane.
保湿剤として含有している請求項１、２又は３記載の酢
酸セルロース膜の前処理方法。4. The method for pretreating a cellulose acetate membrane according to claim 1, wherein the cellulose acetate membrane contains a polyhydric alcohol as a humectant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11151783A JP2000334275A (en) | 1999-05-31 | 1999-05-31 | Pretreatment method of cellulose acetate membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11151783A JP2000334275A (en) | 1999-05-31 | 1999-05-31 | Pretreatment method of cellulose acetate membrane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000334275A true JP2000334275A (en) | 2000-12-05 |
Family
ID=15526212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11151783A Pending JP2000334275A (en) | 1999-05-31 | 1999-05-31 | Pretreatment method of cellulose acetate membrane |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000334275A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008522143A (en) * | 2004-11-29 | 2008-06-26 | オ・テ・ベ・エス・アー | Electrokinetic method for determining the electrostatic charge state of a porous membrane during filtration and its use |
| WO2013118859A1 (en) * | 2012-02-09 | 2013-08-15 | 東洋紡株式会社 | Hollow fiber semipermeable membrane, method for manufacturing same, module, and water treatment method |
| US10252222B2 (en) | 2012-02-24 | 2019-04-09 | Toyobo Co., Ltd. | Hollow fiber type semipermeable membrane, method for manufacturing the same, module, and water treatment method |
-
1999
- 1999-05-31 JP JP11151783A patent/JP2000334275A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008522143A (en) * | 2004-11-29 | 2008-06-26 | オ・テ・ベ・エス・アー | Electrokinetic method for determining the electrostatic charge state of a porous membrane during filtration and its use |
| WO2013118859A1 (en) * | 2012-02-09 | 2013-08-15 | 東洋紡株式会社 | Hollow fiber semipermeable membrane, method for manufacturing same, module, and water treatment method |
| JP5418739B1 (en) * | 2012-02-09 | 2014-02-19 | 東洋紡株式会社 | Hollow fiber type semipermeable membrane, manufacturing method and module thereof, and water treatment method |
| US10369530B2 (en) | 2012-02-09 | 2019-08-06 | Toyobo Co., Ltd. | Hollow fiber semipermeable membrane, method for manufacturing same, module, and water treatment method |
| US10252222B2 (en) | 2012-02-24 | 2019-04-09 | Toyobo Co., Ltd. | Hollow fiber type semipermeable membrane, method for manufacturing the same, module, and water treatment method |
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