JP2005028330A - Sintered metal film cleaning agent and method for cleaning sintered metal film - Google Patents
Sintered metal film cleaning agent and method for cleaning sintered metal film Download PDFInfo
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Abstract
【課題】 焼結金属膜の洗浄能力が高く、ろ過装置本体を定置洗浄することが可能な焼結金属膜洗浄剤及び焼結金属膜の洗浄方法を提供すること。
【解決手段】 １０００ｐｐｍ以上の過硫酸又はその塩を含む焼結金属膜洗浄剤を提供する。また、過硫酸又はその塩を含む水溶液を用いて、７０〜９０℃で加熱洗浄する、定置洗浄することができる焼結金属膜の洗浄方法を提供する。本発明により定置洗浄が可能となるので、大規模なろ過装置等においても、ろ過膜を取り外さずに洗浄することができる。
【選択図】 図１PROBLEM TO BE SOLVED: To provide a sintered metal film cleaning agent and a method for cleaning a sintered metal film, which have a high cleaning ability for a sintered metal film and are capable of cleaning a main body of a filtration device in place.
A sintered metal film cleaning agent containing 1000 ppm or more of persulfuric acid or a salt thereof is provided. Moreover, the washing | cleaning method of the sintered metal film | membrane which can carry out the stationary washing | cleaning which heat-washes at 70-90 degreeC using the aqueous solution containing a persulfuric acid or its salt is provided. Since stationary cleaning is possible according to the present invention, cleaning can be performed without removing the filtration membrane even in a large-scale filtration device or the like.
[Selection] Figure 1
Description
本発明は、焼結金属膜の再生のための洗浄技術に関する。より詳しくは、除濁や除菌に用いられる焼結金属膜の定置洗浄技術に関する。 The present invention relates to a cleaning technique for regeneration of a sintered metal film. More specifically, the present invention relates to a stationary cleaning technique for a sintered metal film used for turbidity or sterilization.
浄水用原水のろ過処理や食品、医薬等の製造プロセスにおける除濁や除菌を行う場合において、耐久性等に優れている焼結金属膜が用いられる場合がある。この焼結金属膜は、金属粉末の集合体を加熱することによって得られる金属多結晶体によって形成されたろ過膜である。この焼結金属膜の空隙には、接触する水に含まれている微細な汚濁成分や微生物等を捕捉する機能を発揮する。 In the case of performing turbidity and sterilization in the raw water purification water purification process and the manufacturing process of food, medicine, etc., a sintered metal film having excellent durability may be used. This sintered metal film is a filtration film formed of a metal polycrystal obtained by heating an aggregate of metal powders. The voids of the sintered metal film exhibit a function of capturing fine contaminant components, microorganisms and the like contained in the water in contact therewith.
この焼結金属膜に、菌、タンパク質、脂質等の有機物が次第に入り込んで汚染されるとろ過機能が低下するので、この焼結金属膜を洗浄再生してろ過機能を回復させるため、焼結金属膜の洗浄を定期的に行う必要がある。 Since the filtration function is lowered when organic substances such as bacteria, proteins, and lipids gradually enter and contaminate the sintered metal film, the sintered metal film is washed and regenerated to restore the filtration function. It is necessary to periodically clean the membrane.
焼結金属膜の洗浄は、非常に難しく、一般的なアルカリ、酸、界面活性剤による洗浄では不充分である。このため、従来は、焼結金属膜を５００〜６００℃の温度条件で燃焼することによって有機物を分解する技術が一般的に採用されてきた。 Cleaning of the sintered metal film is very difficult, and cleaning with a general alkali, acid, or surfactant is insufficient. For this reason, conventionally, a technique for decomposing an organic substance by burning a sintered metal film under a temperature condition of 500 to 600 ° C. has been generally adopted.
特許文献１には、浄水用原水のろ過処理装置に設けられた焼結金属膜を洗浄するための逆洗水に、ソーダ灰（無水炭酸ナトリウム）などのアルカリ剤を添加する技術が開示されている。
しかしながら、燃焼によって焼結金属膜を再生する上記従来技術では、膜をろ過装置本体から一旦取り外して電気炉等で処理する方法が行われるので、手間とコストが非常にかかるという技術的課題があった。また、燃焼によって焼結金属膜を再生する場合、焼結金属膜に焼却灰が残ってしまうという問題があった。さらに、ろ過装置本体の規模が大きい場合には、取り外して燃焼すること自体が難しいため、燃焼によって焼結金属膜を再生することができないという技術的課題があった。 However, in the above-described conventional technique for regenerating a sintered metal film by combustion, there is a technical problem in that it takes a lot of labor and cost because a method of once removing the film from the main body of the filtration apparatus and treating it with an electric furnace or the like is performed. It was. Further, when the sintered metal film is regenerated by combustion, there is a problem that incinerated ash remains in the sintered metal film. Furthermore, when the scale of the filtration apparatus main body is large, it is difficult to remove and burn itself, so there is a technical problem that the sintered metal film cannot be regenerated by combustion.
また、ソーダ灰などの一般的なアルカリ剤を用いた焼結金属膜の洗浄技術では、洗浄が不充分であり、所望するろ過機能を再生させることが困難であった。 Moreover, the cleaning technique of the sintered metal film using a general alkali agent such as soda ash is insufficient in cleaning, and it is difficult to regenerate a desired filtration function.
そこで、本発明は、焼結金属膜の洗浄能力が高く、また、ろ過装置本体を定置洗浄することが可能な焼結金属膜洗浄剤及び焼結金属膜の洗浄方法を提供することを主な目的とする。 Therefore, the present invention mainly provides a sintered metal film cleaning agent and a method for cleaning a sintered metal film, which have a high cleaning ability of the sintered metal film and can clean the main body of the filtration device. Objective.
上記技術的課題を解決するために、本発明では、次の手段を採用する。 In order to solve the above technical problem, the present invention employs the following means.
まず、過硫酸又はその塩を含む焼結金属膜洗浄剤を提供する。特に、過硫酸又はその塩の濃度は、１０００ｐｐｍ以上にすることにより、より洗浄効果をあげることができる。 First, a sintered metal film cleaning agent containing persulfuric acid or a salt thereof is provided. In particular, when the concentration of persulfuric acid or a salt thereof is 1000 ppm or more, the cleaning effect can be further improved.
この洗浄剤は、有機物で汚染した焼結金属膜の洗浄に特に有効である。この洗浄剤は、高温でラジカルを発生するため、焼結金属膜の空隙に入り込んだ有機物等を効果的に取り除き、焼結金属膜のろ過性能を再生する。 This cleaning agent is particularly effective for cleaning a sintered metal film contaminated with organic matter. Since this cleaning agent generates radicals at a high temperature, it effectively removes organic substances and the like that have entered the voids of the sintered metal film and regenerates the filtration performance of the sintered metal film.
洗浄剤として、例えば、過硫酸ナトリウムあるいは過硫酸アンモニウム水溶液を用いることができる。洗浄剤として、過酸化水素を用いると、洗浄時の発泡が激しいという問題点がある。また、過酢酸ソーダは、刺激臭があり、取り扱いにくい。その点、過硫酸ナトリウムあるいは過硫酸アンモニウムは、洗浄効果が高く、また、取り扱いが容易であるという利点があり、本発明の洗浄剤として特に適している。特に、過硫酸アンモニウムは食品添加物であり、食品プロセスでの洗浄剤として適している。 As the cleaning agent, for example, sodium persulfate or ammonium persulfate aqueous solution can be used. When hydrogen peroxide is used as a cleaning agent, there is a problem that foaming during cleaning is severe. In addition, sodium peracetate has an irritating odor and is difficult to handle. In that respect, sodium persulfate or ammonium persulfate has an advantage of high cleaning effect and easy handling, and is particularly suitable as the cleaning agent of the present invention. In particular, ammonium persulfate is a food additive and is suitable as a cleaning agent in food processes.
次に、過硫酸又はその塩を含む水溶液を用いた焼結金属膜の洗浄方法を提供する。焼結金属膜は、有機物等による汚染によって、ろ過機能が低下するが、過硫酸又はその塩を含む水溶液を用いることによって、有機物等によって汚染された焼結金属膜を効率よく洗浄することができる。 Next, a method for cleaning a sintered metal film using an aqueous solution containing persulfuric acid or a salt thereof is provided. The sintered metal film has a reduced filtration function due to contamination with organic matter, etc., but by using an aqueous solution containing persulfuric acid or a salt thereof, the sintered metal film contaminated with organic matter can be efficiently washed. .
この洗浄方法は、特に、洗浄温度条件を７０〜９０℃にすることにより、焼結金属膜のろ過性能を顕著に回復させることができる。また、洗浄に用いる水溶液の過硫酸又はその塩の濃度を、１０００ｐｐｍ以上にすることにより、洗浄効果を高めることができる。 In particular, this cleaning method can significantly recover the filtration performance of the sintered metal film by setting the cleaning temperature condition to 70 to 90 ° C. In addition, the cleaning effect can be enhanced by setting the concentration of persulfuric acid or a salt thereof in the aqueous solution used for cleaning to 1000 ppm or more.
本発明に係る洗浄方法を用いることによって、焼結金属膜のＣＩＰ（定置洗浄）が可能になる。従来は、焼結金属膜をろ過装置本体から取り外し、燃焼することによって、有機物等を除去していた。この方法は、手間やコストがかかり、また、焼結金属膜を劣化させるという問題があった。本発明の洗浄方法は、焼結金属膜を定置洗浄することができるため、手間やコストを軽減できる。また、洗浄工程において、燃焼金属膜を燃焼する手順がないため、焼結金属膜が劣化しない。一般的に、焼結金属膜は、耐久性に優れているという利点があるので、この洗浄方法を用いることにより、焼結金属膜を、ろ過性能を維持したまま、長期間使用することが可能になる。 By using the cleaning method according to the present invention, CIP (fixed cleaning) of the sintered metal film becomes possible. Conventionally, organic materials and the like have been removed by removing the sintered metal film from the filter body and burning it. This method is troublesome and expensive, and has a problem of deteriorating the sintered metal film. Since the cleaning method of the present invention can clean the sintered metal film in place, the labor and cost can be reduced. Further, since there is no procedure for burning the combustion metal film in the cleaning process, the sintered metal film does not deteriorate. In general, sintered metal membranes have the advantage of excellent durability. By using this cleaning method, sintered metal membranes can be used for a long time while maintaining filtration performance. become.
この洗浄方法は、短い時間で、有機物等を効果的に除去できる。また、洗浄時間を長くすることによって、低濃度、低温で、高い洗浄効果をあげることもできる。例えば、洗浄温度を９０℃にし、洗浄剤（過硫酸ソーダ水溶液）の濃度を０．１％、洗浄時間を１時間にすると、有機汚染物質をほぼ１００％除去できる。また、洗浄温度を７０℃にした場合、洗浄剤の濃度を０．５％にすることにより、洗浄時間が１時間でも、有機汚染物質を８０％近く除去できる。洗浄温度を７０℃とし、洗浄剤の濃度を０．１％にしても、洗浄時間を８時間にすれば、有機汚染物質を８０％近く除去できる。 This cleaning method can effectively remove organic substances and the like in a short time. In addition, by increasing the cleaning time, a high cleaning effect can be obtained at a low concentration and a low temperature. For example, when the cleaning temperature is 90 ° C., the concentration of the cleaning agent (sodium persulfate aqueous solution) is 0.1% and the cleaning time is 1 hour, almost 100% of organic contaminants can be removed. In addition, when the cleaning temperature is set to 70 ° C., by setting the concentration of the cleaning agent to 0.5%, it is possible to remove nearly 80% of organic contaminants even if the cleaning time is 1 hour. Even if the cleaning temperature is set to 70 ° C. and the concentration of the cleaning agent is set to 0.1%, if the cleaning time is set to 8 hours, organic contaminants can be removed by nearly 80%.
本発明によって奏される主な効果は、以下のとおりである。 The main effects achieved by the present invention are as follows.
本発明によって、有機物等に汚染された焼結金属膜を効果的に洗浄し、焼結金属膜のろ過性能を回復させることができる。 According to the present invention, a sintered metal film contaminated with an organic substance or the like can be effectively washed and the filtration performance of the sintered metal film can be recovered.
また、焼結金属膜をＣＩＰ（定置洗浄）することができる。定置洗浄することができるので、焼結金属膜の劣化を防ぎ、長期間、ろ過性能を維持することが可能となる。 Further, the sintered metal film can be CIP (fixed cleaning). Since it can be washed in place, it is possible to prevent the sintered metal film from deteriorating and maintain the filtration performance for a long period of time.
実施例１では、本発明に係る洗浄剤を用いて、焼結金属膜を洗浄し、洗浄剤の効果を、温度条件を変えて調べた。温度条件は、５０℃、６０℃、７０℃、９０℃とし、各温度条件で、焼結金属膜を洗浄し、洗浄剤の効果を比較した。 In Example 1, the sintered metal film was cleaned using the cleaning agent according to the present invention, and the effect of the cleaning agent was examined by changing temperature conditions. The temperature conditions were 50 ° C., 60 ° C., 70 ° C., and 90 ° C. Under each temperature condition, the sintered metal film was cleaned, and the effects of the cleaning agents were compared.
本実験は、膜分離装置本体に、焼結金属膜（ろ過膜）を装着して、フラックスを測定することにより行った。膜分離装置とは、ろ過膜を用いて有機物等をろ過、分離するために用いる装置をいう。なお、焼結金属膜には、チューブ径１９ｍｍ、長さ６ｍの金属膜モジュール（ＳＵＳ３１６Ｌ粒子を焼結したチューブの内面に酸化チタンを焼結コーティングした膜）を用いた。 This experiment was performed by attaching a sintered metal membrane (filtration membrane) to the membrane separator main body and measuring the flux. The membrane separation device refers to a device used for filtering and separating organic substances and the like using a filtration membrane. As the sintered metal film, a metal film module having a tube diameter of 19 mm and a length of 6 m (film obtained by sintering and coating titanium oxide on the inner surface of a tube obtained by sintering SUS316L particles) was used.
まず、本実験に際し、コントロールとして、焼結金属膜に純水を流して、フラックスを測定した（洗浄剤使用前の純水フラックス）。純水の温度は２５℃、膜間差圧は、０．１ＭＰａであった。結果は、平均７６２Ｌ／ｍ２／ｈｒであった。 First, in this experiment, as a control, pure water was passed through the sintered metal film, and the flux was measured (pure water flux before using the cleaning agent). The temperature of pure water was 25 ° C., and the transmembrane pressure difference was 0.1 MPa. The result was an average of 762 L / m 2 / hr.
次に、有機物として、ブドウ糖溶液３０Ｌを、焼結金属膜でろ過した。ブドウ糖溶液は、ブドウ糖濃度２５％、ＳＳ濃度０．４％のものを用いた。ろ過時の条件は、一次側圧力を１ＭＰａ、ろ過温度６０℃とした。焼結金属膜（チューブ）内でのブドウ糖溶液循環流量は、７８Ｌ／ｍｉｎ、平均ろ過速度は、３０Ｌ／ｍ２／ｈｒだった。 Next, 30 L of glucose solution as an organic substance was filtered with a sintered metal film. A glucose solution having a glucose concentration of 25% and an SS concentration of 0.4% was used. The filtration conditions were such that the primary pressure was 1 MPa and the filtration temperature was 60 ° C. The glucose solution circulation flow rate in the sintered metal film (tube) was 78 L / min, and the average filtration rate was 30 L / m 2 / hr.
続いて、本発明に係る洗浄剤である過硫酸ソーダを０．１％濃度水溶液に調整し、洗浄を行った。洗浄は、５０℃、６０℃、７０℃、９０℃の各温度条件で、焼結金属膜に洗浄液を１時間流して、ろ過したブドウ糖（有機物質）を洗浄した。 Subsequently, sodium persulfate, which is a cleaning agent according to the present invention, was adjusted to a 0.1% strength aqueous solution and washed. The washing was performed by flowing a washing solution through the sintered metal film for 1 hour under each temperature condition of 50 ° C., 60 ° C., 70 ° C., and 90 ° C. to wash the filtered glucose (organic substance).
洗浄後、再び、焼結金属膜に純水を流して、フラックスの容積を測定し（洗浄剤使用後の純水フラックス）、フラックスがどれだけ回復したかを調べた。「回復率」は、（洗浄剤使用後の純水フラックス）／（未使用膜の純水フラックス）×１００（％）で求めた（以下同様）。 After cleaning, pure water was again flowed through the sintered metal film, and the volume of the flux was measured (pure water flux after using the cleaning agent) to examine how much the flux was recovered. The “recovery rate” was determined by (pure water flux after using the cleaning agent) / (pure water flux of unused film) × 100 (%) (the same applies hereinafter).
図１は、フラックスが、洗浄によってどれくらい回復したかを示している。この図１から明らかなように、フラックスの回復率は、洗浄液を使用する際の温度条件によって変化し、特に、７０℃以上になると、回復率が著しく増加することがわかった。 FIG. 1 shows how much flux was recovered by cleaning. As is apparent from FIG. 1, the recovery rate of the flux varies depending on the temperature condition when using the cleaning liquid, and it is found that the recovery rate increases remarkably when the temperature is 70 ° C. or more.
例えば、５０℃から６０℃、６０℃から７０℃にかけての温度上昇では、回復率は１０％程度しか増加しないが、７０℃から９０℃の温度範囲では、温度が１０℃上昇するにつれて、回復率が２５％程度も増加する。従って、過硫酸ソーダを洗浄液に用いた場合は、温度条件は７０〜９０℃に設定して実施すると、高い洗浄効果が得られる。 For example, when the temperature increases from 50 ° C. to 60 ° C. and from 60 ° C. to 70 ° C., the recovery rate increases only by about 10%, but in the temperature range from 70 ° C. to 90 ° C., the recovery rate increases as the temperature increases by 10 ° C. Increases by about 25%. Therefore, when sodium persulfate is used as the cleaning liquid, a high cleaning effect can be obtained by setting the temperature condition to 70 to 90 ° C.
また、本実験では、洗浄剤として０．１％過硫酸溶液を用いているが、この洗浄剤を用いた場合のフラックスの回復率は、洗浄時間を１時間とした場合、洗浄温度７０℃の時には４０％近く、洗浄温度９０℃の時にはほぼ１００％であった。このことは、本発明の洗浄剤が、０．１％以上の濃度の過硫酸溶液（１０００ｐｐｍ以上の過硫酸又はその塩を含む溶液）であれば、十分な洗浄効果を得ることができることを示している。 In this experiment, a 0.1% persulfuric acid solution was used as a cleaning agent. When this cleaning agent was used, the flux recovery rate was 70 ° C when the cleaning time was 1 hour. Sometimes it was nearly 40% and almost 100% when the washing temperature was 90 ° C. This indicates that a sufficient cleaning effect can be obtained if the cleaning agent of the present invention is a persulfuric acid solution having a concentration of 0.1% or more (a solution containing 1000 ppm or more of persulfuric acid or a salt thereof). ing.
実施例２では、回復率に対する洗浄剤の濃度の影響を調べる実験を行った。 In Example 2, an experiment was conducted to examine the influence of the concentration of the cleaning agent on the recovery rate.
実験方法は、実施例１と同様に行った。洗浄液として用いる過硫酸ソーダは、０．１％、０．５％、１％濃度水溶液を用いた。洗浄の際の温度は、６０℃、７０℃の二つの条件で行った。洗浄時間は、１時間とした。 The experimental method was the same as in Example 1. Sodium persulfate used as a cleaning solution was a 0.1%, 0.5%, 1% strength aqueous solution. The temperature at the time of washing was two conditions of 60 ° C. and 70 ° C. The washing time was 1 hour.
添付した図２は、洗浄液の濃度の変化によって、フラックスが、どれくらい回復したかを示している。洗浄の際の温度が６０℃（図２の◆参照）、７０℃（図２の▲参照）の条件では、いずれの場合においても、フラックスの回復率は、洗浄液の濃度によって変化している。しかし、洗浄の際の温度が７０℃の場合では、０．５％以下の低濃度域においても、濃度変化による回復率増加が大きいことがわかる。また、０．５％濃度付近において、洗浄温度６０℃、７０℃の回復率の差が約５０％となり最大となる（図２参照）。 The attached FIG. 2 shows how much the flux is recovered by changing the concentration of the cleaning solution. Under the conditions of the cleaning temperature of 60 ° C. (see ◆ in FIG. 2) and 70 ° C. (see ▲ in FIG. 2), the flux recovery rate varies depending on the concentration of the cleaning liquid. However, when the temperature at the time of cleaning is 70 ° C., it can be seen that the recovery rate increase due to the concentration change is large even in the low concentration range of 0.5% or less. In the vicinity of 0.5% concentration, the difference between the recovery rates at the cleaning temperatures of 60 ° C. and 70 ° C. is about 50%, which is the maximum (see FIG. 2).
なお、同様の実験を、洗浄温度を９０℃にして行った場合は、洗浄液の濃度が０．１％の条件でも、回復率は１００％近くだった（図示せず）。また、洗浄温度を５０℃にした場合は、洗浄液の濃度をあげても、回復率は１０％程度のままであった（図示せず）。 When the same experiment was performed at a cleaning temperature of 90 ° C., the recovery rate was close to 100% even when the concentration of the cleaning liquid was 0.1% (not shown). When the cleaning temperature was 50 ° C., the recovery rate remained at about 10% even if the concentration of the cleaning liquid was increased (not shown).
この実験の結果から、洗浄時の温度を７０℃以上にすれば、低濃度であっても、高い洗浄効果が得られることがわかった。 From the results of this experiment, it was found that a high cleaning effect can be obtained even at a low concentration if the temperature during cleaning is set to 70 ° C. or higher.
実施例３では、回復率と洗浄時間の関係を検証する実験を行った。 In Example 3, an experiment was conducted to verify the relationship between the recovery rate and the cleaning time.
実験方法は、実施例１と同様である。洗浄時の温度は、７０℃とし、洗浄液には０．１％濃度の過硫酸ソーダ水溶液を用いて、１時間、８時間、１６時間でフラックスを測定し、回復率を算出した。 The experimental method is the same as in Example 1. The temperature at the time of cleaning was 70 ° C., and a 0.1% concentration sodium persulfate aqueous solution was used as the cleaning liquid, and the flux was measured at 1 hour, 8 hours, and 16 hours to calculate the recovery rate.
添付した図３は、洗浄時間の変化によって、フラックスがどれくらい回復したかを示している。この実験の結果は、まず、洗浄時間が長ければそれだけ、フラックスは回復することを示しており、８時間が経過すると、回復率は８０％近くとなり、１６時間後には、フラックスは、ほぼ１００％近くまで回復している。 The attached FIG. 3 shows how much the flux has been recovered by changing the cleaning time. The results of this experiment show that the flux recovers as long as the cleaning time is longer. After 8 hours, the recovery rate is close to 80%, and after 16 hours, the flux is almost 100%. It has recovered to near.
なお、洗浄温度を９０℃に設定した場合、約０．５時間で、回復率は、１００％近くになった（図示せず）。また、洗浄温度を５０℃に設定した場合、洗浄時間を長くしても、回復率は１０％程度で、それ以上の洗浄効果は見られなかった（図示せず）。 When the cleaning temperature was set to 90 ° C., the recovery rate was close to 100% in about 0.5 hours (not shown). Further, when the cleaning temperature was set to 50 ° C., the recovery rate was about 10% even when the cleaning time was extended, and no further cleaning effect was seen (not shown).
実施例４は、過硫酸ソーダ、過酢酸ソーダ、過酸化水素の三種類の溶液の、洗浄効果を検証した実験である。 Example 4 is an experiment in which the cleaning effect of three kinds of solutions of sodium persulfate, sodium peracetate, and hydrogen peroxide was verified.
実験方法は、実施例１と同様である。洗浄剤は、過硫酸ソーダ、過酢酸ソーダ、過酸化水素の三種類の溶液を用いた。各溶液の濃度は、０．０２ｍｏｌ／Ｌにした。洗浄時の温度は、９０℃、洗浄時間は１時間とした。 The experimental method is the same as in Example 1. As cleaning agents, three kinds of solutions of sodium persulfate, sodium peracetate and hydrogen peroxide were used. The concentration of each solution was 0.02 mol / L. The temperature during washing was 90 ° C., and the washing time was 1 hour.
コントロールとして、前記と同様に、未使用のろ過膜（焼結金属膜）を、純水で洗浄後に、純水を流して、フラックスを測定した。結果は、平均７２０Ｌ／ｍ２／ｈｒであった。 As a control, as before, an unused filtration membrane (sintered metal membrane) was washed with pure water, and pure water was then flowed to measure the flux. The result was an average of 720 L / m 2 / hr.
図４は、洗浄剤として、過硫酸ソーダ、過酢酸ソーダ、過酸化水素の三種類の溶液を用いた場合の、洗浄効果を示している。過硫酸ソーダは、ほぼ１００％の回復率を示している。過酢酸ソーダ、過酸化水素の溶液についても、７０％以上の洗浄効果が見られた。過硫酸ソーダは、他の二種類の溶液（過酢酸ソーダ、過酸化水素）と比べて、明らかに洗浄効果が高いことがわかった。 FIG. 4 shows the cleaning effect when three types of solutions of sodium persulfate, sodium peracetate, and hydrogen peroxide are used as cleaning agents. Sodium persulfate shows a recovery rate of almost 100%. A cleaning effect of 70% or more was also observed with a solution of sodium peracetate and hydrogen peroxide. It was found that sodium persulfate was clearly more effective in cleaning than the other two types of solutions (sodium peracetate and hydrogen peroxide).
比較例１では、従来のアルカリ性の洗浄剤を用いた場合に、フラックスがどれくらい回復するかを示している。 Comparative Example 1 shows how much the flux recovers when a conventional alkaline cleaning agent is used.
実験方法は、実施例１と同じである。洗浄剤には、２％ＮａＯＨ溶液を用いた。洗浄時の温度は、９３℃とし、３０分間洗浄を行った。 The experimental method is the same as in Example 1. As the cleaning agent, a 2% NaOH solution was used. The temperature during washing was 93 ° C., and washing was performed for 30 minutes.
コントロールとして、前記と同様に、未使用のろ過膜（焼結金属膜）に純水を流して、フラックスを測定した。結果は、６２０Ｌ／ｍ２／ｈｒであった。 As a control, as described above, pure water was passed through an unused filtration membrane (sintered metal membrane), and the flux was measured. The result was 620 L / m 2 / hr.
従来の洗浄剤で洗浄した後に、フラックスを測定した結果、洗浄剤使用後の純水フラックスは、２８０Ｌ／ｍ２／Ｈｒで、従来の洗浄剤による回復率は、約４５％であった。一方、本発明の洗浄剤を用いた場合の回復率は、実施例１（図１）に示されているとおり、洗浄時間１時間、洗浄時の温度９０℃の条件では、ほぼ１００％である。従って、本発明の洗浄剤は、従来の洗浄液と比較して、明らかに洗浄効果が高いことがわかった。 As a result of measuring the flux after cleaning with the conventional cleaning agent, the pure water flux after using the cleaning agent was 280 L / m 2 / Hr, and the recovery rate by the conventional cleaning agent was about 45%. On the other hand, the recovery rate when using the cleaning agent of the present invention is almost 100% under the conditions of a cleaning time of 1 hour and a cleaning temperature of 90 ° C. as shown in Example 1 (FIG. 1). . Therefore, it was found that the cleaning agent of the present invention clearly has a higher cleaning effect than the conventional cleaning liquid.
本発明は、例えば、浄水用原水のろ過処理や、食品、医薬等の製造プロセスにおける除濁・除菌の際に、ろ過装置等を定置洗浄することができるという点で、産業上の利用可能性がある。本発明によってろ過装置等を定置洗浄することができるため、ろ過装置等が大規模で、ろ過装置に装着したろ過膜を取り外して洗浄することが難しい場合等に、本発明は特に有用である。 INDUSTRIAL APPLICABILITY The present invention is industrially applicable in that, for example, a filtration device can be washed in place during filtration of raw water for water purification, turbidity and sterilization in the production process of food, medicine, etc. There is sex. Since the filtration device or the like can be washed in place by the present invention, the present invention is particularly useful when the filtration device or the like is large and it is difficult to remove and wash the filtration membrane attached to the filtration device.
Claims (5)
The method for cleaning a sintered metal film according to claim 3 or 4, wherein the concentration of persulfuric acid or a salt thereof in the aqueous solution is 1,000 ppm or more.
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| JP2009120252A (en) * | 2007-11-16 | 2009-06-04 | Daiwa Can Co Ltd | Method and apparatus for supplying sterile liquefied gas to liquefied gas filling device |
| JP2012067152A (en) * | 2010-09-21 | 2012-04-05 | Kao Corp | Cleaning method of hard surface |
| CN103551044A (en) * | 2013-11-20 | 2014-02-05 | 哈尔滨理工大学 | Method for cleaning polluted membrane by using singlet oxygen produced from peroxymonosulfate under induction of inorganic solid peroxide |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2009509731A (en) * | 2005-09-27 | 2009-03-12 | シーメンス・ウォーター・テクノロジーズ・コーポレイション | Chemical cleaning agent and filtration membrane cleaning method |
| JP2009120252A (en) * | 2007-11-16 | 2009-06-04 | Daiwa Can Co Ltd | Method and apparatus for supplying sterile liquefied gas to liquefied gas filling device |
| JP2012067152A (en) * | 2010-09-21 | 2012-04-05 | Kao Corp | Cleaning method of hard surface |
| CN103551044A (en) * | 2013-11-20 | 2014-02-05 | 哈尔滨理工大学 | Method for cleaning polluted membrane by using singlet oxygen produced from peroxymonosulfate under induction of inorganic solid peroxide |
| CN103551044B (en) * | 2013-11-20 | 2015-07-22 | 哈尔滨理工大学 | Method for cleaning polluted membrane by using singlet oxygen produced from peroxymonosulfate under induction of inorganic solid peroxide |
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