JP3345732B2 - Water purification equipment - Google Patents
Water purification equipmentInfo
- Publication number
- JP3345732B2 JP3345732B2 JP11790494A JP11790494A JP3345732B2 JP 3345732 B2 JP3345732 B2 JP 3345732B2 JP 11790494 A JP11790494 A JP 11790494A JP 11790494 A JP11790494 A JP 11790494A JP 3345732 B2 JP3345732 B2 JP 3345732B2
- Authority
- JP
- Japan
- Prior art keywords
- biological treatment
- raw water
- water
- membrane filtration
- membrane
- 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.)
- Expired - Fee Related
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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Biological Treatment Of Waste Water (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、原水を生物処理した
後、膜濾過により固液分離を行い、分離された濁質を濃
縮する浄水装置に係り、特に、小スペース化および処理
能力の増大を図った浄水装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification apparatus for subjecting raw water to biological treatment, then performing solid-liquid separation by membrane filtration, and concentrating the separated suspended matter. The present invention relates to a water purification device designed for the above.
【０００２】[0002]
【従来の技術】水処理設備、特に上水設備において、原
水中に含まれるアンモニア性窒素，かび臭，藻類，マン
ガン等を生物処理により除去した後、膜濾過により固液
分離を行う浄水処理は、従来、図５に示す処理工程を経
て行われている。沈砂池５１に取り入れられた原水は、
大型の浮遊物、懸濁物が取り除かれた後、着水井５２に
貯留される。貯留された原水は、凝集，沈殿，濾過等通
常の浄水処理の前処理として、生物処理設備５３におい
て送られ生物処理が行われる。そして、凝集沈殿池５４
でフロックの沈殿除去を行った後、濾過池５５で濾過さ
れ、処理水は、次工程５６へと送られるものである。な
お、凝集沈殿池５４で沈殿させたフロックは、濃縮装置
５７で濃縮された後、排出される。2. Description of the Related Art In a water treatment facility, in particular, a water supply facility, a water purification treatment in which ammonia nitrogen, musty odor, algae, manganese, etc. contained in raw water is removed by biological treatment and then solid-liquid separation is performed by membrane filtration, Conventionally, this is performed through the processing steps shown in FIG. Raw water taken into the sand basin 51
After large suspended matters and suspended matters are removed, they are stored in the landing well 52. The stored raw water is sent to the biological treatment facility 53 for biological treatment as a pretreatment for ordinary water purification treatment such as coagulation, sedimentation and filtration. And the coagulation sedimentation basin 54
After the sedimentation of floc is removed by filtration, the filtered water is filtered in the filtration pond 55 and the treated water is sent to the next step 56. The floc settled in the coagulation sedimentation tank 54 is discharged after being concentrated in the concentration device 57.
【０００３】[0003]
【発明が解決しようとする課題】上記した従来の浄水設
備では、次のような問題点がある。原水は、生物処理設
備５３において生物処理が行われ、凝集沈殿池５４でフ
ロックの沈殿除去を行った後、次の工程である濾過池５
５で濾過されるようになっている。したがって、生物処
理設備５３と凝集沈殿池５４と濾過池５５とが、それぞ
れ別々に設置されており、特に、これらは浄水施設の中
でも夫々設置スペースを多くとるものであることから、
両者が占める面積の割合はかなり大きなものとなる。こ
のように、設備の設置面積によって処理能力が決まって
しまい、小スペースでは処理能力を大きくすることがで
きない。また、生物処理、沈殿処理の後に濾過処理を行
うため、処理時間がかかる。The above-mentioned conventional water purification equipment has the following problems. The raw water is subjected to biological treatment in the biological treatment equipment 53, and after floc sedimentation is removed in the coagulation sedimentation tank 54, the next step is the filtration pond 5.
5 to be filtered. Therefore, the biological treatment equipment 53, the coagulation sedimentation basin 54, and the filtration pond 55 are separately installed, respectively. In particular, since these take up a large installation space among the water purification facilities,
The proportion of the area occupied by both is considerably large. Thus, the processing capacity is determined by the installation area of the equipment, and the processing capacity cannot be increased in a small space. Further, since the filtration treatment is performed after the biological treatment and the precipitation treatment, the treatment time is required.
【０００４】本発明は、従来技術の有する上記の問題点
を解決し、小スペース化が図れると共に、処理時間を短
縮できる浄水装置を提供することを目的とする。[0004] It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a water purification apparatus which can reduce the space and shorten the processing time.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明は、微生物を付着させた接触材に原水を接
触させて浄化を行う生物処理装置と、この生物処理され
た原水を濾過膜に透過させて固液分離を行い処理水を系
外に取り出す膜濾過装置とを、単一の処理槽内に配設し
たことを特徴とする浄水装置を構成した。また、本発明
は、微生物を付着させた接触材に原水を接触させて浄化
を行う生物処理装置と、この生物処理された原水を濾過
膜に透過させて固液分離を行い処理水を系外に取り出す
膜濾過装置と、前記生物処理装置および膜濾過装置の下
方に位置し、原水中に含まれている固形物および沈殿物
を分離する濃縮装置とを、単一の処理槽内に配設したこ
とを特徴とする浄水装置を構成した。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a biological treatment apparatus for purifying raw water by contacting raw water with a contact material to which microorganisms are adhered, A water purification apparatus was provided in which a membrane filtration device, which permeates a filtration membrane to separate solid-liquid to remove treated water outside the system, was disposed in a single treatment tank. In addition, the present invention provides a biological treatment apparatus for purifying raw water by contacting the raw material with a contact material to which microorganisms are adhered, and a solid-liquid separation by permeating the biologically treated raw water through a filtration membrane to separate the treated water from the system. And a concentration device for separating solids and sediments contained in raw water, which are located below the biological treatment device and the membrane filtration device, are disposed in a single treatment tank. A water purifier characterized by having been constructed.
【０００６】[0006]
【作用】原水は、処理槽内において、生物処理装置と膜
濾過装置との間を循環しつつ浄化され、処理水は、系外
に取り出される。また、原水中に含まれている固形物お
よび沈殿物は、同一処理槽内の濃縮装置により分離され
て系外に排出される。The raw water is purified while circulating between the biological treatment device and the membrane filtration device in the treatment tank, and the treated water is taken out of the system. Further, solids and sediments contained in the raw water are separated by a concentrating device in the same treatment tank and discharged out of the system.
【０００７】[0007]
【実施例】以下に、本発明の実施例を図面について説明
する。図１は、本発明を実施した浄水装置の一例を示す
断面図である。図中、符号１は、生物処理装置および膜
濾過装置、更には濃縮装置をそれぞれ内部に収める処理
槽であって、望ましくは下部を狭めたホッパ形状に形成
される。処理槽１の内部には、その上部側に仕切板７を
隔てて生物処理装置２および膜濾過装置３を並設してお
り、処理されるべき原水１０が処理槽１に導入される。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view illustrating an example of a water purification device embodying the present invention. In the figure, reference numeral 1 denotes a treatment tank for accommodating a biological treatment device, a membrane filtration device, and a concentration device, respectively, and is preferably formed in a hopper shape having a narrow lower portion. Inside the treatment tank 1, a biological treatment device 2 and a membrane filtration device 3 are juxtaposed with a partition plate 7 on the upper side thereof, and raw water 10 to be treated is introduced into the treatment tank 1.
【０００８】生物処理方式には、水中に固定したプラス
チックの小筒の集合体によるハニコーム方式（浸漬濾床
法），回転する円板による回転円板方式，粒状の濾材に
よる生物接触濾過方式等が従来知られており、いずれの
方式を用いてもよいが、本実施例では、生物処理装置２
として、図２に示す浸漬濾床法を採用したので、その具
体例について説明する。処理槽１内に、充填材２１とし
て、塩化ビニルシートを蜂の巣状（均一な六角形）に成
型した小筒２１ａの集合体を浸している。充填材２１に
は、その表面に生物膜が付着しており、図中下方から上
方に向け充填材２１に原水を通過させ、生物膜と接触さ
せることにより、原水中のアンモニア性窒素，藻類，か
び臭，陰イオン界面活性剤，マンガン等を有効に除去し
得る。[0008] The biological treatment method includes a Hanikome method (immersion filter bed method) using an assembly of small plastic cylinders fixed in water, a rotating disk method using a rotating disk, and a biological contact filtration method using a granular filter medium. Conventionally known, any method may be used, but in this embodiment, the biological treatment apparatus 2 is used.
Since the immersion filter bed method shown in FIG. 2 was adopted, a specific example thereof will be described. An assembly of small cylinders 21a formed by molding a polyvinyl chloride sheet into a honeycomb shape (uniform hexagon) is immersed in the treatment tank 1 as a filler 21. A biofilm is attached to the surface of the filler 21. Raw water passes through the filler 21 from the lower side to the upper side in the figure and is brought into contact with the biofilm, so that ammonia nitrogen, algae, It can effectively remove musty odor, anionic surfactant, manganese, etc.
【０００９】生物処理装置２の下部側には、エアー噴出
管５を配設し、処理槽１外に設けたエアー供給源からエ
アー５ａを連続的または間欠的に送給している。微生物
による有機物の酸化・分解反応や、アンモニア性窒素の
酸化には、溶存酸素の存在が不可欠である。したがっ
て、原水中の酸素が不足するおそれがある場合は、エア
ーを吹き込み、酸素を補給する必要がある。An air ejection pipe 5 is provided below the biological treatment apparatus 2, and air 5 a is continuously or intermittently supplied from an air supply source provided outside the treatment tank 1. The presence of dissolved oxygen is indispensable for the oxidation / decomposition reaction of organic substances by microorganisms and the oxidation of ammoniacal nitrogen. Therefore, when there is a possibility that oxygen in the raw water becomes insufficient, it is necessary to supply air by blowing air.
【００１０】また、エアー噴出管５から噴出するエアー
５ａにより、原水は、処理槽１内を上昇し、図１の矢印
Ｃで示すように、膜濾過装置３側に流れ、再び生物処理
装置２側に還流する、いわゆる循環流を発生させる。し
たがって、生物膜と水の接触頻度を増加させ、処理効果
を高めることができる。また、エアー噴出管５から噴出
するエアー５ａにより循環流を起こさせるので、循環用
ポンプを別途設ける必要がなく、エネルギーの有効利用
を図ることができる。肥厚した生物膜は、循環流により
生じる剪弾力により脱落し、同時に新しい微生物が増加
し、常に活性度の高い生物膜が保持される。The raw water rises in the treatment tank 1 by the air 5a ejected from the air ejection pipe 5, flows toward the membrane filtration device 3 as shown by the arrow C in FIG. A so-called circulating flow is generated that recirculates to the side. Therefore, the frequency of contact between the biofilm and water can be increased, and the treatment effect can be enhanced. In addition, since the circulating flow is caused by the air 5a ejected from the air ejecting pipe 5, there is no need to separately provide a circulation pump, and energy can be effectively used. The thickened biofilm falls off due to the shearing force generated by the circulating flow, and at the same time, the number of new microorganisms increases, and a highly active biofilm is always maintained.
【００１１】次に、膜濾過装置３について説明する。本
実施例においては、膜濾過装置３として、図３に示す外
圧式のクロスフロー濾過装置を採用した。処理槽１内に
配設した中空糸膜モジュール３１は、例えばセルロース
アセテートを良溶媒に溶解した後これに金属塩と添加溶
媒を加えたポリマー溶液を紡糸した多孔膜中空糸であっ
て、膜槽３１ａと中空部３１ｂとから構成される。原水
１０は、膜層３１ａの外側を、図中上方から下方に、膜
層３１ａに平行に流され、膜層３１ａをこれに直交する
方向（矢印方向）から透過する。このクロスフロー濾過
により、固液分離され、膜層３１ａの内側、つまり中空
部３１ｂに透過された濾液である処理水２０が、系外に
取り出されるものである。中空糸膜モジュール３１の膜
層３１ａの外側には、固液分離された濁質８が付着して
いる。Next, the membrane filtration device 3 will be described. In this embodiment, an external pressure type cross-flow filtration device shown in FIG. The hollow fiber membrane module 31 disposed in the treatment tank 1 is, for example, a porous membrane hollow fiber obtained by dissolving cellulose acetate in a good solvent and then spinning a polymer solution obtained by adding a metal salt and an additive solvent thereto. 31a and a hollow portion 31b. The raw water 10 flows from the upper side to the lower side in the drawing in parallel with the membrane layer 31a outside the membrane layer 31a, and permeates the membrane layer 31a in a direction perpendicular to the membrane layer 31a (arrow direction). By this cross-flow filtration, the treated water 20, which is a filtrate separated by solid-liquid separation and transmitted through the inside of the membrane layer 31a, that is, into the hollow portion 31b, is taken out of the system. On the outside of the membrane layer 31a of the hollow fiber membrane module 31, the turbid material 8 separated into solid and liquid is attached.
【００１２】膜濾過装置３の下部側には、エアー噴出管
６を配設し、処理槽１外に設けたエアー供給源からエア
ー６ａを間欠的に送給することにより、前記膜層３１ａ
の外側に付着した濁質８を除去する。処理槽１の下部に
溜まった沈殿物は、定期的に系外に排出される。An air ejection pipe 6 is provided below the membrane filtration device 3 and intermittently supplies air 6a from an air supply source provided outside the processing tank 1, whereby the membrane layer 31a is formed.
The turbidity 8 adhering to the outside of is removed. The sediment accumulated in the lower part of the processing tank 1 is periodically discharged out of the system.
【００１３】上記のように、生物処理装置２および膜濾
過装置３を単一の処理槽１内に収容したので、生物処
理，膜濾過の両装置をそれぞれ別々に設置するものに比
較して小スペース化を図ることができ、同時に、処理時
間を短縮することができる。As described above, since the biological treatment device 2 and the membrane filtration device 3 are housed in the single treatment tank 1, the size of the biological treatment device and the membrane filtration device 3 are smaller than those in which the biological treatment device and the membrane filtration device are separately installed. Space can be achieved, and at the same time, processing time can be reduced.
【００１４】次に、図１を参照して、生物処理装置２と
膜濾過装置３の下方に位置させて濃縮装置４を配設した
例について説明する。濃縮装置４は、図４の（ａ）にそ
の具体例を示すように、鉛直方向に対して６０度の傾斜
角度をもつ傾斜板４１を所定の間隔で所要数並設した傾
斜板沈降装置や、図４の（ｂ）のように、六角形状（円
形でもよい）の管４２を鉛直方向に対して６０度の傾斜
角度をもつように密接させて所要数配設した傾斜管沈降
装置が用いられ、原水中に含まれている固形物および沈
殿物を分離する。濃縮された沈殿物は、処理槽１の下部
から定期的に系外に排出される。Next, an example in which a concentrating device 4 is disposed below the biological treatment device 2 and the membrane filtration device 3 will be described with reference to FIG. As shown in a specific example in FIG. 4A, the concentrating device 4 includes an inclined plate sedimentation device in which a required number of inclined plates 41 having an inclination angle of 60 degrees with respect to the vertical direction are arranged at predetermined intervals. As shown in FIG. 4 (b), a required number of hexagonal (or circular) pipes 42 are arranged in close contact with each other so as to have a tilt angle of 60 degrees with respect to the vertical direction. To separate solids and sediments contained in the raw water. The concentrated precipitate is periodically discharged from the lower part of the processing tank 1 to the outside of the system.
【００１５】上記のように、生物処理装置２，膜濾過装
置３および濃縮装置４を単一の処理槽１内に収容した浄
水装置では、生物処理，膜濾過，濃縮の各装置をそれぞ
れ別々に設置するものに比較して小スペース化を図るこ
とができ、同時に、処理時間を短縮することができる。As described above, in the water purification device in which the biological treatment device 2, the membrane filtration device 3 and the concentration device 4 are accommodated in a single treatment tank 1, the biological treatment, membrane filtration and concentration devices are separately performed. Space can be reduced as compared with the one to be installed, and at the same time, processing time can be reduced.
【００１６】[0016]
【発明の効果】以上説明したように、本発明の浄水装置
によれば、生物処理装置および膜濾過装置、更には濃縮
装置をそれぞれ単一の処理槽に収容し、処理槽内に原水
の循環流を起こし、生物処理および膜濾過を行い、濃縮
装置で濃縮する各処理を一工程で連続処理することがで
きるので、従来の装置のように各処理工程を個別に行う
ものに比較して、設置スペースを小さくすることがで
き、また、処理時間を大幅に短縮できる効果がある。As described above, according to the water purification apparatus of the present invention, the biological treatment apparatus, the membrane filtration apparatus, and the concentrator are each housed in a single treatment tank, and the raw water is circulated in the treatment tank. A flow is generated, biological treatment and membrane filtration are performed, and each treatment for concentration by the concentration device can be continuously performed in one step, so that compared to a conventional device in which each treatment step is performed individually, There is an effect that the installation space can be reduced and the processing time can be significantly reduced.
【図１】本発明を実施した浄水装置の一例を示す断面図
である。FIG. 1 is a cross-sectional view illustrating an example of a water purification device embodying the present invention.
【図２】本発明の浄水装置に用いられる生物処理装置の
一例を示す斜視図である。FIG. 2 is a perspective view showing an example of a biological treatment device used in the water purification device of the present invention.
【図３】本発明の浄水装置に用いられる膜濾過装置の一
例を示す斜視図である。FIG. 3 is a perspective view showing an example of a membrane filtration device used in the water purification device of the present invention.
【図４】本発明の浄水装置に用いられる濃縮装置の一例
を示す斜視図である。FIG. 4 is a perspective view showing an example of a concentrator used in the water purification device of the present invention.
【図５】従来の浄水装置の処理工程を示すフロー図であ
る。FIG. 5 is a flowchart showing processing steps of a conventional water purification device.
１ …処理槽 ２ …生物処理装置 ３ …膜濾過装置 ４ …濃縮装置 ５ …エアー噴出管 ６ …エアー噴出管 １０ …原水 DESCRIPTION OF SYMBOLS 1 ... Treatment tank 2 ... Biological treatment apparatus 3 ... Membrane filtration apparatus 4 ... Concentration apparatus 5 ... Air ejection pipe 6 ... Air ejection pipe 10 ... Raw water
フロントページの続き (56)参考文献 特開 平２−71896（ＪＰ，Ａ) 特開 平４−94800（ＪＰ，Ａ) 特開 平６−23380（ＪＰ，Ａ) 特開 平５−96292（ＪＰ，Ａ) 特開 平３−98699（ＪＰ，Ａ) 特開 昭64−2567（ＪＰ，Ａ) 特開 昭61−200894（ＪＰ，Ａ) 特開 昭62−181772（ＪＰ，Ａ) 実開 平３−128500（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 1/44 C02F 3/06 C02F 3/10 C02F 3/20 B01D 63/02 Continuation of front page (56) References JP-A-2-71896 (JP, A) JP-A-4-94800 (JP, A) JP-A-6-23380 (JP, A) JP-A-5-96292 (JP) JP-A-3-98699 (JP, A) JP-A-64-2567 (JP, A) JP-A-61-200894 (JP, A) JP-A-62-181772 (JP, A) 3-128500 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) C02F 1/44 C02F 3/06 C02F 3/10 C02F 3/20 B01D 63/02
Claims (3)
触材に原水を接触させて浄化を行う生物処理装置と、こ
の生物処理された原水を濾過膜に透過させて固液分離を
行い処理水を系外に取り出す膜濾過装置とを、仕切板を
介して並置し、かつ、前記生物処理装置に対してエアー
を吹き込み、当該生物処理装置と前記膜濾過装置との間
に循環流を発生させるため、前記生物処理装置の下部側
にエアー噴出管を設けたことを特徴とする浄水装置。1. A biological treatment apparatus for purifying raw water in a single treatment tank by contacting raw water with a contact material having microorganisms attached thereto, and a solid-liquid separation by permeating the biologically treated raw water through a filtration membrane. And a membrane filtration device for taking out treated water out of the system are juxtaposed via a partition plate, and air is blown into the biological treatment device, and circulated between the biological treatment device and the membrane filtration device. The lower side of the biological treatment device to generate flow
Water purification device which is characterized by providing an air injection tube.
触材に原水を接触させて浄化を行う生物処理装置と、こ
の生物処理された原水を濾過膜に透過させて固液分離を
行い処理水を系外に取り出す膜濾過装置とを、仕切板を
介して並置し、かつ、前記生物処理装置に対してエアー
を吹き込み、当該生物処理装置と前記膜濾過装置との間
に循環流を発生させるため、前記生物処理装置の下部側
にエアー噴出管を設けるとともに、前記生物処理装置お
よび膜濾過装置の下方に位置し、原水中に含まれている
固形物および沈殿物を分離する濃縮装置を配設したこと
を特徴とする浄水装置。2. A biological treatment apparatus for purifying raw water in a single treatment tank by contacting raw water with a contact material having microorganisms attached thereto, and a solid-liquid separation by permeating the biologically treated raw water through a filtration membrane. And a membrane filtration device for taking out treated water out of the system are juxtaposed via a partition plate, and air is blown into the biological treatment device, and circulated between the biological treatment device and the membrane filtration device. The lower side of the biological treatment device to generate flow
And a concentrating device which is located below the biological treatment device and the membrane filtration device and separates solids and sediments contained in the raw water. .
れた傾斜板または密接させて所要数配設された傾斜管で
あることを特徴とする請求項２に記載の浄水装置。3. The water purifier according to claim 2, wherein the concentrating device is a required number of inclined plates or a predetermined number of inclined pipes arranged at a predetermined interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11790494A JP3345732B2 (en) | 1994-05-31 | 1994-05-31 | Water purification equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11790494A JP3345732B2 (en) | 1994-05-31 | 1994-05-31 | Water purification equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07323295A JPH07323295A (en) | 1995-12-12 |
| JP3345732B2 true JP3345732B2 (en) | 2002-11-18 |
Family
ID=14723079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11790494A Expired - Fee Related JP3345732B2 (en) | 1994-05-31 | 1994-05-31 | Water purification equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3345732B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4672993B2 (en) * | 2004-03-29 | 2011-04-20 | 阪神水道企業団 | Media and membrane filtration combined filtration equipment |
| JP5111757B2 (en) * | 2005-12-09 | 2013-01-09 | 月島機械株式会社 | Filtration unit |
| CN104874211B (en) * | 2015-04-29 | 2017-01-18 | 南京梅山冶金发展有限公司 | Anti-blocking method used for large diameter-height-ratio thickener |
-
1994
- 1994-05-31 JP JP11790494A patent/JP3345732B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07323295A (en) | 1995-12-12 |
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