JPH04358526A - Water content removing method using porous film - Google Patents
Water content removing method using porous filmInfo
- Publication number
- JPH04358526A JPH04358526A JP3131509A JP13150991A JPH04358526A JP H04358526 A JPH04358526 A JP H04358526A JP 3131509 A JP3131509 A JP 3131509A JP 13150991 A JP13150991 A JP 13150991A JP H04358526 A JPH04358526 A JP H04358526A
- Authority
- JP
- Japan
- Prior art keywords
- amount
- filter
- resin
- filter aid
- pores
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 10
- 239000011148 porous material Substances 0.000 claims abstract description 18
- 239000010954 inorganic particle Substances 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 5
- 239000011737 fluorine Substances 0.000 claims abstract description 5
- 229920006122 polyamide resin Polymers 0.000 claims abstract description 5
- 239000012528 membrane Substances 0.000 claims description 20
- 239000002699 waste material Substances 0.000 abstract description 11
- 239000010802 sludge Substances 0.000 abstract description 6
- 238000000855 fermentation Methods 0.000 abstract description 4
- 230000004151 fermentation Effects 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 230000001580 bacterial effect Effects 0.000 description 7
- 239000011550 stock solution Substances 0.000 description 6
- 239000004744 fabric Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000005909 Kieselgur Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- SHFGJEQAOUMGJM-UHFFFAOYSA-N dialuminum dipotassium disodium dioxosilane iron(3+) oxocalcium oxomagnesium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Na+].[Na+].[Al+3].[Al+3].[K+].[K+].[Fe+3].[Fe+3].O=[Mg].O=[Ca].O=[Si]=O SHFGJEQAOUMGJM-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002207 metabolite Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011027 product recovery Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Filtering Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は多孔膜を用いた水分除去
方法に関する。更に詳しくは発酵工業に於ける廃菌体、
活性汚泥法による余剰汚泥、及び含水率の高い物質中の
水分を多孔膜を介し、加圧、或いは真空吸引により水分
を除去する方法である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing moisture using a porous membrane. For more details, waste bacteria in the fermentation industry,
This is a method in which excess sludge from the activated sludge method and moisture in substances with high moisture content are removed through a porous membrane by pressurization or vacuum suction.
【０００２】0002
【従来の技術】発酵工業に於て生ずる廃菌体や活性汚泥
法による余剰汚泥等はその性質上、後述する濾過助剤を
使用した濾過技術を駆使し、固形化したケークを野山に
廃棄する方法が主であった。しかしながら、近年、産業
廃棄物の投棄については環境上の問題もあり、投棄先が
制限されるにいたり、発生場所での焼却が望ましいもの
とされている。従来、廃菌体、余剰汚泥は以下に挙げる
ような手法により処理を行ってきた。[Prior art] Due to the nature of waste bacteria generated in the fermentation industry and surplus sludge from activated sludge methods, filtration technology using a filter aid, which will be described later, is used to dispose of the solidified cake in fields and mountains. The main thing was the method. However, in recent years, there have been environmental problems with the dumping of industrial waste, and the destinations where it can be dumped have become restricted, and it has become desirable to incinerate it at the site where it is generated. Conventionally, waste bacterial cells and surplus sludge have been treated using the methods listed below.
【０００３】■ フィルタープレス
■ ベルトプレス
■ ヌッチェフィルター
■ ベルトフィルター
■ オリバーフィルター
上記■、■、■は加圧により水分除去を行う方法であり
、■、■は主として真空吸引により水分除去を行う方法
である。[0003] ■ Filter press ■ Belt press ■ Nutsche filter ■ Belt filter ■ Oliver filter The above methods ■, ■, and ■ are methods for removing moisture by pressurization, and ■ and ■ are methods for removing moisture mainly by vacuum suction. be.
【０００４】これらの方法はいずれも濾材として多くは
濾布を用いその上に濾過助剤をプレコートするか、又は
必要に応じてまず濾過助剤をボディフィードし、濾布の
表面にケーク層を形成させ固液分離を行う点で特徴を同
じくする。ここで言うプレコートとは濾過助剤を予め濾
材表面にコーティングすることで、これにより濾過効率
、濾過精度をあげるともに、濾材の汚染を防いでいる。[0004] In all of these methods, a filter cloth is often used as the filter medium, and a filter aid is precoated thereon, or if necessary, the filter aid is first body-fed and a cake layer is formed on the surface of the filter cloth. They have the same characteristics in that they form and perform solid-liquid separation. The term "precoat" used herein refers to coating the surface of a filter medium with a filter aid in advance, thereby increasing filtration efficiency and filtration accuracy and preventing contamination of the filter medium.
【０００５】また、ボディフィードとは原液中に濾過助
剤を加え、濾過に附することでこれにより、ケーク層の
カサ密度が小さくなり、濾過が促進されるとともに濾過
安定性が保たれる。濾過助剤の種類としては一般的に珪
藻土、パーライト、セルロースパウダー等が使用される
。[0005] Body feed is a method in which a filter aid is added to the stock solution and used for filtration, thereby reducing the bulk density of the cake layer, promoting filtration, and maintaining filtration stability. Diatomaceous earth, perlite, cellulose powder, etc. are generally used as filter aids.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上述の
従来技術には以下のような問題点がある。■ 濾材上
にプレコート層を形成させる必要がある。また、濾過効
率を上げる為には、更に濾過助剤を必要量ボディフィー
ドしなければならない。このため、廃棄物の生成量が増
加する。However, the above-mentioned prior art has the following problems. ■ It is necessary to form a precoat layer on the filter medium. In addition, in order to increase the filtration efficiency, a necessary amount of filter aid must be fed to the body. Therefore, the amount of waste generated increases.
【０００７】■ 濾過効率を上げるためには濾過助剤
のもつ硬度を利用してカサ密度を小さく保つ必要があり
、必然的に硬度の高い無機質の濾過助剤、例えば珪藻土
が利用される傾向が強い。このため、コストの低いセル
ロースパウダー等、有機質の濾過助剤は硬度が低いが故
に焼却が可能にもかかわらず敬遠されがちであった。■
また、例えば菌体代謝物等は製品回収等の点からケ
ーク層の洗浄が必要であるが、従来方法ではプレコート
層もふくめて洗浄が必要であったため、洗浄水量も比較
的多く、実濾液量は原液の量にくらべ１２０〜１５０％
になることが常であった。[0007] In order to increase filtration efficiency, it is necessary to use the hardness of the filter aid to keep the bulk density small, and there is a natural tendency to use inorganic filter aids with high hardness, such as diatomaceous earth. strong. For this reason, low-cost organic filter aids such as cellulose powder tend to be avoided even though they can be incinerated due to their low hardness. ■
In addition, for example, for bacterial cell metabolites, it is necessary to wash the cake layer from the point of view of product recovery, etc., but in the conventional method, the pre-coat layer was also required to be washed, so the amount of washing water was relatively large, and the amount of actual filtrate was is 120-150% compared to the amount of stock solution.
It used to be.
【０００８】本発明は前記の点を解決すべく、濾材とし
て前記の多孔膜を用いることにより、濾過助剤、水洗水
量の軽減を行い、合わせて廃棄物量の少量化、及び有機
質の濾過助剤の使用により廃棄物の焼却も可能にするこ
とを目的とする。[0008] In order to solve the above-mentioned problems, the present invention reduces the amount of filter aid and washing water by using the above-mentioned porous membrane as a filter medium, and also reduces the amount of waste and reduces the amount of organic filter aid. The purpose is to make it possible to incinerate waste by using .
【０００９】[0009]
【課題を解決するための手段】本発明はポリアミド系樹
脂、ポリオレフィン系樹脂、またはフッ素系樹脂からな
る三次元網目構造内に平均孔径１μｍ以下の孔を有する
多孔質無機粒子を１０〜７５重量％保持した厚さ０．１
〜１ｍｍの多孔膜を濾材として用いた水分除去方法であ
る。[Means for Solving the Problems] The present invention contains 10 to 75% by weight of porous inorganic particles having pores with an average pore diameter of 1 μm or less in a three-dimensional network structure made of polyamide resin, polyolefin resin, or fluorine resin. Retained thickness 0.1
This is a water removal method using a porous membrane of ~1 mm as a filter medium.
【００１０】本発明において、最も特徴とするところは
三次元網目構造を有する多孔膜に平均孔径１μｍ以下の
孔を多数有する多孔質無機粒子（例えば二酸化ケイ素、
アルミナ等の多孔質セラミック、多孔質炭素など）を保
持させたことにある。樹脂に対する多孔質無機粒子の保
持割合は１０〜７５重量％、好ましくは３５〜７０重量
％である。The most distinctive feature of the present invention is that porous inorganic particles (for example, silicon dioxide,
Porous ceramics such as alumina, porous carbon, etc.) are retained. The retention ratio of the porous inorganic particles to the resin is 10 to 75% by weight, preferably 35 to 70% by weight.
【００１１】本発明に用いられる多孔膜は図１に示す断
面構造を有する、いわゆる三次元網目構造をとっている
。この多孔膜を加圧または真空吸引することにより、膜
内の多孔質無機粒子部分を流路として水が透過し、膜表
面にケーク層が形成される。このケーク層形成の際、従
来の濾布等の濾材であれば、濾過に寄与する孔が大きい
ため、濾材の目づまりが大きく、濾過助剤のプレコート
が必要となる。この時の濾過助剤の平均粒径は１〜１０
０μｍが一般的である。The porous membrane used in the present invention has a so-called three-dimensional network structure having the cross-sectional structure shown in FIG. By applying pressure or vacuum suction to this porous membrane, water permeates through the porous inorganic particle portion within the membrane as a flow path, and a cake layer is formed on the membrane surface. When forming this cake layer, if a filter medium such as a conventional filter cloth is used, the pores that contribute to filtration are large, so the filter medium becomes clogged, and precoating with a filter aid is required. The average particle size of the filter aid at this time is 1 to 10
0 μm is common.
【００１２】なお、ここで三次元網目構造とは、例えば
実公昭６３−８７２４号公報の第２図に示されるような
三次元方向に通孔が複雑に入りくんだ構造をさしている
。本発明の特徴は多孔膜とは言いながら、孔を有する部
分が無機粒子部分に限られ、しかも無機粒子の孔が非常
に微細なため、極端に目づまりし難い点にある。また、
濾過効率を上げるためには従来どおり少量の濾過助剤を
ボディフィードすることも可能であり、この際にはセル
ロースパウダーの如き有機質の濾過助剤を用いると焼却
処理が可能なケークとなる。[0012] Here, the three-dimensional network structure refers to a structure in which through holes are intricately arranged in three-dimensional directions, as shown in FIG. 2 of Publication of Utility Model Publication No. 63-8724, for example. The feature of the present invention is that although it is a porous membrane, the portion with pores is limited to the inorganic particle portion, and since the pores of the inorganic particles are very fine, they are extremely difficult to clog. Also,
In order to increase the filtration efficiency, it is possible to body-feed a small amount of filter aid as usual, and in this case, if an organic filter aid such as cellulose powder is used, a cake that can be incinerated is produced.
【００１３】もう一つの特徴は膜の構造上、多孔質無機
粒子は三次元網目構造の中から脱落することなく保持さ
れ、かつ膜表面にその一部が露出して濾水流路を確保す
る形と成っており、膜の物理的強度はポリアミド系樹脂
、ポリオレフィン系樹脂または、フッ素系樹脂固有の強
度に依存し、十分な強度を有するため、オリバーフィル
ターのように、ケークのかきとりが必要な場合でも充分
に対処しうる。Another characteristic of the membrane structure is that the porous inorganic particles are retained within the three-dimensional network structure without falling off, and a portion of them is exposed on the membrane surface to ensure a drainage flow path. The physical strength of the membrane depends on the inherent strength of polyamide resin, polyolefin resin, or fluorine resin, and since it has sufficient strength, it can be used in cases where cake scraping is required, such as with Oliver filters. But it can be handled well.
【００１４】以上２点の大きな特徴をもつ本発明のフィ
ルム状の多孔膜は、従来の濾過装置の濾材として、どの
装置にも適用できる。これにより従来の煩雑なプレコー
ト作業が省略でき、また、使用後の多孔質膜はケークと
とも焼却が可能となる。The film-like porous membrane of the present invention having the above two major features can be applied to any conventional filtration device as a filter medium. As a result, the conventional complicated pre-coating work can be omitted, and the porous membrane after use can be incinerated together with the cake.
【００１５】[0015]
【実施例】次に実施例を挙げて説明する。[Example] Next, an example will be given and explained.
【００１６】[0016]
【実施例１】原液として菌体を含む５％菌体液を、濾過
装置としてフィルタープレス、濾材として平均孔径０．
１μｍの孔を多量に含むＳｉＯ２ 粒子を５０％含むポ
リオレフィン系樹脂の多孔膜を用いて濾過した。その条
件及び結果を表１に示す。[Example 1] A 5% bacterial cell solution containing bacterial cells was used as a stock solution, a filter press was used as a filtration device, and an average pore size of 0.05 was used as a filter medium.
It was filtered using a porous membrane of polyolefin resin containing 50% of SiO2 particles containing a large amount of pores of 1 μm. The conditions and results are shown in Table 1.
【００１７】[0017]
【比較例１】原液として菌体を含む５％菌体液を濾過装
置としてフィルタープレス、濾材として濾布、濾過助剤
として珪藻土＃１００を用いて濾過した。その条件及び
結果を表２に示す。本結果では、濾過助剤を３％程度ポ
ディフィードすることにより、含水率について７０％を
切るケークがえられた。この含水率は少量の助燃剤によ
り、充分に焼却しうる値である。[Comparative Example 1] A 5% bacterial cell solution containing bacterial cells as a stock solution was filtered using a filter press as a filtration device, a filter cloth as a filter medium, and diatomaceous earth #100 as a filter aid. The conditions and results are shown in Table 2. In the present results, a cake with a water content of less than 70% was obtained by podifeeding about 3% of the filter aid. This moisture content is a value that allows sufficient incineration with a small amount of combustion improver.
【００１８】尚従来法による含水率は８５〜９５％程度
であるが、これはボディフィードを使用した上、さらに
プレコートも使用しないと達成されないことが比較例か
らわかる。[0018] The moisture content according to the conventional method is about 85 to 95%, but it can be seen from the comparative examples that this cannot be achieved unless a body feed is used and a precoat is also not used.
【００１９】[0019]
【実施例２】原液として菌体を含む発酵液を、濾過装置
としてオリバーフィルター、濾材として平均孔径０．０
５μｍの孔を多量に含むＳｉＯ２ 粒子を５０％含むポ
リオレフィン系多孔膜を用いて濾過した。その条件及び
結果を表３に示す。[Example 2] A fermentation liquid containing bacterial cells was used as a stock solution, an Oliver filter was used as a filtration device, and an average pore diameter of 0.0 was used as a filter medium.
It was filtered using a polyolefin porous membrane containing 50% SiO2 particles containing a large amount of pores of 5 μm. The conditions and results are shown in Table 3.
【００２０】[0020]
【比較例２】実施例２において平均孔径０．０５μｍの
孔を多量に含むＳｉＯ２ 粒子を５０％含むポリオレフ
ィン系多孔膜の代りに、従来の濾布を用い、同一の原液
量（１ｍ３ ）から成分回収率が同一（９８％）になる
ようにして濾過して、必要なプレコート量（％）を求め
た。
その結果を本発明と比較して表４に示す。[Comparative Example 2] In place of the polyolefin porous membrane containing 50% of SiO2 particles containing a large amount of pores with an average pore diameter of 0.05 μm in Example 2, a conventional filter cloth was used, and the components were extracted from the same amount of stock solution (1 m3). The necessary amount of precoat (%) was determined by filtration so that the recovery rate was the same (98%). The results are shown in Table 4 in comparison with the present invention.
【００２１】オリバーフィルターは必ずと言ってよいほ
どプレコートが必要であるが本結果ではプレコートなし
で従来と同様な結果が得られた。また洗浄水量に大幅な
改善が見られ、従来珪藻土によるプレコートでは同じ成
分回収率（９８％）を得るために洗浄水量は原水の３０
％を要したものが１０％に軽減している。[0021] Oliver filters almost always require precoating, but in the present results, similar results to conventional filters were obtained without precoating. In addition, a significant improvement was seen in the amount of washing water, and in order to obtain the same component recovery rate (98%) with conventional precoating with diatomaceous earth, the amount of washing water was 30% of the raw water.
% has been reduced to 10%.
【００２２】[0022]
【表１】[Table 1]
【００２３】[0023]
【表２】[Table 2]
【００２４】[0024]
【表３】[Table 3]
【００２５】[0025]
【表４】[Table 4]
【００２６】[0026]
【発明の効果】本発明の多孔膜を用いた水分除去方法を
利用することにより、従来の設備をそのまま転用でき、
また濾材を交換するだけで廃棄物量の減少と可燃化をは
かることができる。また濾過助剤に安価な有機質助剤（
例えばセルロースパウダー）が使用でき、少ない廃棄物
量と合わせてより経済的な処理方法を提供できる。[Effect of the invention] By using the moisture removal method using the porous membrane of the present invention, conventional equipment can be used as is,
Additionally, by simply replacing the filter media, it is possible to reduce the amount of waste and make it combustible. In addition, inexpensive organic filter aids (
For example, cellulose powder) can be used, which together with the reduced amount of waste can provide a more economical treatment method.
【図１】本発明の多孔膜の断面図である。FIG. 1 is a cross-sectional view of a porous membrane of the present invention.
１．樹脂 ２．多孔質無機粒子 ３．多孔質無機粒子の孔 1. resin 2. porous inorganic particles 3. Pores in porous inorganic particles
Claims (1)
樹脂、またはフッ素系樹脂からなる三次元網目構造内に
平均孔径１μｍ以下の孔を有する多孔質無機粒子を１０
〜７５重量％保持した厚さ０．１〜１ｍｍの多孔膜を用
いた水分除去方法Claim 1: 10 porous inorganic particles having pores with an average pore diameter of 1 μm or less in a three-dimensional network structure made of polyamide resin, polyolefin resin, or fluorine resin.
Moisture removal method using a porous membrane with a thickness of 0.1 to 1 mm that retains ~75% by weight
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13150991A JP3161749B2 (en) | 1991-06-04 | 1991-06-04 | Water removal method using porous membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13150991A JP3161749B2 (en) | 1991-06-04 | 1991-06-04 | Water removal method using porous membrane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04358526A true JPH04358526A (en) | 1992-12-11 |
| JP3161749B2 JP3161749B2 (en) | 2001-04-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13150991A Expired - Fee Related JP3161749B2 (en) | 1991-06-04 | 1991-06-04 | Water removal method using porous membrane |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3161749B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010131500A (en) * | 2008-12-03 | 2010-06-17 | Sumitomo Heavy Ind Ltd | Sludge treatment method and sludge treatment apparatus |
| JP2010131499A (en) * | 2008-12-03 | 2010-06-17 | Sumitomo Heavy Ind Ltd | Sludge dewatering method |
| CN114452716A (en) * | 2020-11-09 | 2022-05-10 | 西安昊锐电子科技有限公司 | Production method of microporous filtering material |
-
1991
- 1991-06-04 JP JP13150991A patent/JP3161749B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010131500A (en) * | 2008-12-03 | 2010-06-17 | Sumitomo Heavy Ind Ltd | Sludge treatment method and sludge treatment apparatus |
| JP2010131499A (en) * | 2008-12-03 | 2010-06-17 | Sumitomo Heavy Ind Ltd | Sludge dewatering method |
| CN114452716A (en) * | 2020-11-09 | 2022-05-10 | 西安昊锐电子科技有限公司 | Production method of microporous filtering material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3161749B2 (en) | 2001-04-25 |
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