JPH0334264Y2 - - Google Patents
Info
- Publication number
- JPH0334264Y2 JPH0334264Y2 JP9712685U JP9712685U JPH0334264Y2 JP H0334264 Y2 JPH0334264 Y2 JP H0334264Y2 JP 9712685 U JP9712685 U JP 9712685U JP 9712685 U JP9712685 U JP 9712685U JP H0334264 Y2 JPH0334264 Y2 JP H0334264Y2
- Authority
- JP
- Japan
- Prior art keywords
- steam gas
- sludge
- water
- condensing means
- dehydrator
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000010802 sludge Substances 0.000 claims description 23
- 230000001877 deodorizing effect Effects 0.000 claims description 18
- 238000004140 cleaning Methods 0.000 claims description 16
- 239000002351 wastewater Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 239000000498 cooling water Substances 0.000 claims description 10
- 230000018044 dehydration Effects 0.000 claims description 9
- 238000006297 dehydration reaction Methods 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 4
- 238000004332 deodorization Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 235000019645 odor Nutrition 0.000 description 10
- 239000000706 filtrate Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Sludge (AREA)
Description
この考案は下水汚泥等の有機物を多量に含む汚
泥を被脱水処理物として脱水処理を行う電気浸透
脱水機、特にその脱水処理過程で発生する臭気を
脱臭処理する装置に関する。
This invention relates to an electroosmotic dehydrator that dehydrates sludge containing a large amount of organic matter, such as sewage sludge, as a material to be dehydrated, and particularly relates to a device that deodorizes odors generated during the dehydration process.
下水処理場等で大量に発生する汚泥の脱水処理
装置として頭記した電気浸透脱水機が広く採用さ
れている。ここで第３図により従来における連続
処理式の電気浸透脱水機の構成を説明する。第３
図において、１はスプロケツト間に張架された陽
極側電極部材を兼ねたプレスベルト、２は前記プ
レスベルト１に対向してスプロケツト間に張架さ
れた濾液濾過用の濾材としてのフイルタベルト、
３はフイルタベルト２の移動経路に沿つてその背
面側に設置された陰極側電極、４はベルト駆動モ
ータ、５が前記プレスベルト１と陰極側電極３と
の間に電圧を印加する直流電源であり、前記プレ
スベルト１とフイルタベルト２との対向面域に形
成された汚泥搬送通路６の入口側には汚泥器ホツ
パ７が、また陰極側電極部材３の下方には系外に
通じる濾液の受け皿８が配備されている。
かかる構成でホツパ７を通じて汚泥９を搬送通
路６内に送り込むと、汚泥は搬送通路内をプレス
ベルト１とフイルタベルト２との間に挟まれて矢
印Ｐ方向へ搬送される。この搬送過程で汚泥には
機械的な圧搾力が加わるとともに、一方では電源
５からの電圧印加により対向電極間に電場が作用
し、これにより汚泥９に含まれている水分は正に
帯電されて陰極側へ流動して電極部材３に放電す
るとともに、フイルタベルト２および陰極側電極
部材３の透孔を透過して汚泥から分離脱水され、
濾液受け皿８を経て系外に排出される。一方、脱
水された汚泥はケーキ化され、脱水ケーキ１０と
なつて搬送通路６の出口より搬出回収される。
一方、前記の脱水処理の進行により、濾布等で
作られたフイルタベルト２は汚泥で目詰まり、汚
れ等が生じるので、これを清浄化して再生するた
めに通常はフイルタベルト２の移動経路の途中箇
所には洗浄スプレー１１を設置し、上水または二
次処理水等を水源とした洗浄水をフイルタベルト
に噴射してベルトの洗浄を行うようにフイルタベ
ルトの洗浄設備が付設されている。なお洗浄後の
洗浄排水は排水受け１２で受け、系外に導いて排
水処理される。
さらに当該電気浸透脱水機では脱水処理の過程
で電極間の通電に伴い発熱が生じ、このために汚
泥の含有水分の一部は蒸発して蒸気ガスとなつて
周囲に拡散する。しかも被脱水処理物である汚泥
が下水汚泥のように有機物を多く含むものである
場合には、汚泥中に多く含まれている臭気成分が
蒸気ガスとともに周囲に拡散することになり、こ
のまま放置したのでは環境公害を招くことにな
る。このために従来の電気浸透脱水機設備では周
囲環境の保全策として、図示のように脱水機の上
方を発生蒸気ガスの収集フード１３で覆い、かつ
このフード１３内に集められた蒸気ガス１４をブ
ロア１５を装備した排気導風路１６を通じて図示
されてない脱臭設備へ導き、この脱臭設備で活性
炭等の吸着剤、その他の薬剤を使用して脱臭処理
するようにしている。
しかして上記した従来の脱臭処理方式のように
脱水処理工程で発生した蒸気ガスを収集して脱臭
設備へ導いた上で活性炭、その他の薬剤を使用し
て脱臭処理する方式では、電気浸透脱水機の脱水
処理工程で発生する蒸気ガス量が多量であること
から脱臭設備の負荷が大きく、設備内で使用する
活性炭等の吸着剤およびその他の使用薬品の消費
量が多くなり運転経費が嵩むことになる。
The above-mentioned electroosmotic dehydrator is widely used as a dewatering device for sludge generated in large quantities in sewage treatment plants and the like. Here, the configuration of a conventional continuous process type electroosmotic dehydrator will be explained with reference to FIG. Third
In the figure, 1 is a press belt stretched between sprockets and also serves as an anode-side electrode member; 2 is a filter belt 2, which is stretched between the sprockets facing the press belt 1 and serves as a filter medium for filtration of filtrate;
3 is a cathode side electrode installed on the back side of the filter belt 2 along the moving path; 4 is a belt drive motor; and 5 is a DC power source that applies voltage between the press belt 1 and the cathode side electrode 3. A sludge hopper 7 is located on the inlet side of the sludge conveyance passage 6 formed in the area facing the press belt 1 and the filter belt 2, and a sludge hopper 7 is located below the cathode side electrode member 3 for the filtrate communicating with the outside of the system. A saucer 8 is provided. With this configuration, when the sludge 9 is fed into the conveyance passage 6 through the hopper 7, the sludge is conveyed in the direction of arrow P within the conveyance passage while being sandwiched between the press belt 1 and the filter belt 2. During this transport process, a mechanical squeezing force is applied to the sludge, and on the other hand, an electric field is applied between the opposing electrodes due to the voltage applied from the power source 5, and as a result, the water contained in the sludge 9 is positively charged. It flows to the cathode side and is discharged to the electrode member 3, and at the same time passes through the through holes of the filter belt 2 and the cathode side electrode member 3, and is separated and dehydrated from the sludge.
The filtrate is discharged to the outside of the system through the filtrate receiving tray 8. On the other hand, the dehydrated sludge is turned into a cake, and the dehydrated cake 10 is carried out and recovered from the exit of the conveyance passage 6. On the other hand, as the dehydration process progresses, the filter belt 2 made of filter cloth or the like becomes clogged with sludge and becomes contaminated, so in order to clean and regenerate this, the movement path of the filter belt 2 is usually changed. A cleaning spray 11 is installed at an intermediate location, and filter belt cleaning equipment is attached so that the belt can be cleaned by spraying cleaning water from tap water, secondary treated water, or the like onto the filter belt. Note that the cleaning waste water after cleaning is received by the waste water receiver 12 and led out of the system to be treated as waste water. Further, in the electro-osmotic dehydrator, heat is generated due to the current flowing between the electrodes during the dehydration process, and as a result, a portion of the moisture contained in the sludge evaporates and becomes vapor gas, which is diffused into the surroundings. Moreover, if the sludge to be dewatered contains a large amount of organic matter, such as sewage sludge, the odor components contained in the sludge will diffuse into the surrounding area along with the steam gas, making it difficult to leave it as it is. This will lead to environmental pollution. For this reason, in conventional electroosmotic dehydrator equipment, as a measure to preserve the surrounding environment, the upper part of the dehydrator is covered with a collection hood 13 for the generated steam gas, as shown in the figure, and the steam gas 14 collected in this hood 13 is The exhaust gas is led to a deodorizing facility (not shown) through an air guide path 16 equipped with a blower 15, and is deodorized using an adsorbent such as activated carbon or other chemicals. However, in the conventional deodorizing method described above, which collects the steam gas generated during the dehydration process and guides it to the deodorizing equipment, and then deodorizes it using activated carbon and other chemicals, the electroosmotic dehydrator The large amount of steam gas generated during the dehydration process places a heavy load on the deodorizing equipment, which increases the consumption of adsorbents such as activated carbon and other chemicals used within the equipment, increasing operating costs. Become.
この考案は上記の点にかんがみなされたもので
あり、先記した脱臭設備の負荷軽減化を主目的と
してその前段で簡易な手段でプレ脱臭できるよう
にした電気浸透脱水機の脱臭装置を提供すること
を目的とする。
This invention was developed in consideration of the above points, and the main purpose is to reduce the load on the deodorizing equipment mentioned above, and provide a deodorizing device for an electroosmotic dehydrator that can perform pre-deodorizing by a simple means in the preceding stage. The purpose is to
上記目的を達成するために、この考案は電気浸
透脱水機に対し、脱水処理過程で汚泥から発生す
る臭気成分を含む蒸気ガスを収集して系外に排気
する排気導風路と、該排気導風路内に設置した前
記蒸気ガスを水冷却により凝縮させる表面式復水
器ないし混合式復水器としてなる復水手段とを備
え、電気浸透脱水機の本体側で濾材の洗浄に使用
した洗浄排水を復水手段の冷却水として再利用
し、前記の復水手段で収集蒸気ガスを凝縮させる
ことにより、臭気成分を蒸気ガスの凝縮水に溶解
させた上で凝縮水と共に系外に排除して脱臭処理
するよう構成したものである。
In order to achieve the above object, this invention provides an electroosmotic dehydrator with an exhaust air guide path that collects steam gas containing odor components generated from sludge during the dehydration process and exhausts it out of the system. The cleaning device is equipped with a condensing means as a surface type condenser or a mixed type condenser that condenses the steam gas by water cooling installed in the air passage, and is used for cleaning filter media on the main body side of the electroosmotic dehydrator. By reusing the wastewater as cooling water for the condensing means and condensing the collected steam gas with the condensing means, the odor components are dissolved in the condensed water of the steam gas and then removed from the system together with the condensed water. It is designed to perform deodorizing treatment.
第１図はこの考案の一実施例の構成図、第２図
は第１図と異なる実施例の要部構成図であり、第
３図に対応する部材には同一符号が付してある。
すなわち第１図において、この考案により蒸気ガ
スの排気導風路におけるガス収集フード１３の排
気出口側には、蒸気ガス通路内に収集蒸気ガスを
凝縮させる復水手段として符号１７で示す表面式
復水器が設置されている。この表面式復水器１７
は冷却水を通流する熱交換器としてなり、かつそ
の冷却水は電気浸透脱水機本体側におけるフイル
タベルト２の洗浄排水を水源として供給するよう
にしている。このために濾材洗浄排水受け１２と
前記復水器１７との間が給水ポンプ１８を備えた
給水路１９で接続配管されており、洗浄排水受け
１２内に回収貯留されている洗浄排水２０を復水
器１７へ供給し、ここで蒸気ガス導風路１６内に
流れる蒸気ガス１４を復水器１７との間の熱交換
により冷却して凝縮させる。なお蒸気ガスの凝縮
水は復水器１７の下方に配備された凝縮水受け２
１で受けた後に濾液受け皿８へ導き、ここから系
外に導いて排水処理される。
上記により汚泥の脱水処理工程で発生する蒸気
ガス中含まれている臭気成分の多くは蒸気ガスの
凝縮過程で凝縮水に溶解し、凝縮水と一緒に凝縮
水受け２１を経て脱水機本体側で汚泥より脱水さ
れた濾液と共に系外に排水処理されることにな
る。これによりガス収集フード１３に収集された
蒸気ガス中の臭気成分の多くは前記の凝縮工程で
プレ脱臭されることになり、これとは別に後段に
接続した薬剤処理方式の脱臭設備の負荷を軽減
し、その脱臭設備での活性炭等の消費量の大幅な
節減化が図れるようになる。しかもこのプレ脱臭
工程では活性炭等の薬剤は一切使用せず、脱水機
本体側で使用された濾材の洗浄排水を冷却水とし
て有効に再利用するので経済的に有利である。
次に第２図に別な実施例を示す。すなわち第２
図の実施例では復水手段として冷却水を蒸気ガス
通路内に直接撒布して蒸気ガスを凝縮させる混合
式復水器２２がガス収集フード１３の出口側導風
路内に設置されている。かかる構成で脱水機本体
側で回収された濾材の洗浄排水を給水路１９を通
じて前記の復水器２２へ供給し、ここから導風路
内を流れる蒸気ガスへ向けて冷却水を撒布するこ
とにより、蒸気ガスは冷却水と混合し合つて凝縮
するとともにその凝縮水中に臭気成分を多く取り
込み、凝縮水受け２１を経て第１図と同様に系外
に導いて排水処理される。
FIG. 1 is a block diagram of one embodiment of this invention, and FIG. 2 is a block diagram of main parts of an embodiment different from that in FIG. 1, and members corresponding to those in FIG. 3 are given the same reference numerals.
That is, in FIG. 1, according to this invention, a surface type condenser indicated by the reference numeral 17 is installed on the exhaust outlet side of the gas collection hood 13 in the steam gas exhaust guide path as a condensing means for condensing the collected steam gas in the steam gas passage. A water fountain is installed. This surface type condenser 17
serves as a heat exchanger through which cooling water flows, and the cooling water is supplied from cleaning waste water of the filter belt 2 on the electroosmotic dehydrator main body side as a water source. For this purpose, a water supply conduit 19 equipped with a water supply pump 18 is connected between the filter medium washing wastewater receiver 12 and the condenser 17, and the washing wastewater 20 collected and stored in the washing wastewater receiver 12 is recycled. The steam gas 14 is supplied to the water tank 17, where the steam gas 14 flowing into the steam gas guide path 16 is cooled and condensed by heat exchange with the condenser 17. The condensed water of the steam gas is collected from the condensed water receiver 2 located below the condenser 17.
After receiving the filtrate at 1, it is guided to a filtrate receiving tray 8, from where it is led out of the system and treated as wastewater. As described above, most of the odor components contained in the steam gas generated in the sludge dehydration process are dissolved in the condensed water during the condensation process of the steam gas, and together with the condensed water, they pass through the condensed water receiver 21 to the dehydrator main body side. The sludge is drained out of the system along with the filtrate that has been dehydrated. As a result, most of the odor components in the steam gas collected in the gas collection hood 13 are pre-deodorized in the condensation process, which also reduces the load on the chemical treatment type deodorization equipment connected downstream. However, the consumption of activated carbon, etc. in the deodorizing equipment can be significantly reduced. Moreover, this pre-deodorizing process does not use any chemicals such as activated carbon, and the waste water used for cleaning the filter media used in the main body of the dehydrator is effectively reused as cooling water, which is economically advantageous. Next, FIG. 2 shows another embodiment. That is, the second
In the illustrated embodiment, a mixing type condenser 22 is installed as a condensing means in the outlet-side air guide path of the gas collection hood 13, which sprays cooling water directly into the steam gas passage to condense the steam gas. With this configuration, the cleaning waste water of the filter media collected on the dehydrator main body side is supplied to the condenser 22 through the water supply channel 19, and cooling water is sprayed from there toward the steam gas flowing in the air guide channel. The steam gas is mixed with the cooling water and condensed, and many odor components are taken into the condensed water.The steam gas is led out of the system through the condensed water receiver 21 and treated as wastewater in the same manner as shown in FIG. 1.
【考案の効果】
以上述べたようにこの考案によれば、電気浸透
脱水機に対し、脱水処理過程で汚泥から発生する
臭気成分を含む蒸気ガスを収集して系外に排気す
る排気導風路と、該排気導風路内に設置した前記
蒸気ガスを凝縮させる復水手段とを備え、電気浸
透脱水機の本体側で濾材の洗浄に使用した洗浄排
水を復水手段の冷却水として再利用し、復水手段
で収集蒸気ガスを凝縮させることにより臭気成分
を蒸気ガスの凝縮水と共に系外に排除して脱臭処
理するよう構成したことにより、脱水処理工程で
発生した臭気成分の内の多くを別な脱臭設備へ送
り込んで脱臭処理する以前の段階でプレ脱臭する
ことができ、これにより活性炭等の薬剤で脱臭処
理する後段の脱臭設備の負荷を大幅に軽減して設
備の小形化を図ることができる。しかもプレ脱臭
工程の復水手段では濾材の洗浄排水を再使用する
だけであり、運転費用も少なくて済む等の経済的
利点が得られる。[Effects of the invention] As described above, this invention provides an exhaust air guide for an electroosmotic dehydrator that collects steam gas containing odor components generated from sludge during the dehydration process and exhausts it outside the system. and a condensing means for condensing the steam gas installed in the exhaust air guide path, and the cleaning waste water used for cleaning the filter medium on the main body side of the electroosmotic dehydrator is reused as cooling water for the condensing means. However, by condensing the collected steam gas using the condensing means, the odor components are removed from the system together with the condensed water of the steam gas. It is possible to perform pre-deodorization at a stage before sending the odor to another deodorizing equipment for deodorizing treatment, which greatly reduces the load on the subsequent deodorizing equipment that deodorizes with chemicals such as activated carbon, allowing the equipment to be made more compact. be able to. In addition, the condensing means in the pre-deodorizing step only reuses the waste water from washing the filter medium, which provides economical advantages such as low operating costs.
第１図はこの考案の一実施例による電気浸透脱
水機およびその脱臭装置の構成配置図、第２図は
第１図と異なる実施例の要部構成図、第３図は従
来における電気浸透脱水機の構成図である。図に
おいて、
１：陽極側電極部材兼用のプレスベルト、２：
濾材としてのフイルタベルト、３：陰極側電極部
材、５：電源、９：汚泥、１１：濾材洗浄用の洗
浄スプレー、１２：洗浄排水受け、１３：蒸気ガ
ス収集フード、１４：蒸気ガス、１６：蒸気ガス
の排気導風路、１７：表面式復水器、２０：濾材
の洗浄排水、２１：凝縮水受け、２２：混合式復
水器。
Fig. 1 is a structural layout diagram of an electroosmotic dehydrator and its deodorizing device according to an embodiment of this invention, Fig. 2 is a structural diagram of main parts of an embodiment different from Fig. 1, and Fig. 3 is a conventional electroosmotic dehydrator. FIG. In the figure, 1: Press belt that also serves as an anode side electrode member, 2:
Filter belt as a filter medium, 3: Cathode side electrode member, 5: Power source, 9: Sludge, 11: Cleaning spray for cleaning filter medium, 12: Washing waste water receiver, 13: Steam gas collection hood, 14: Steam gas, 16: Steam gas exhaust air guide path, 17: surface type condenser, 20: filter medium cleaning drainage, 21: condensed water receiver, 22: mixing type condenser.
Claims (1)
供給し、電気浸透作用により濾材を介して汚泥
を脱水処理する電気浸透脱水機に対し、脱水処
理過程で汚泥から発生する臭気成分を含む蒸気
ガスを収集して系外に排気する排気導風路と、
該排気導風路内に設置され水冷却により前記蒸
気ガスを凝縮させる復水手段とを備え、該復水
手段で収集蒸気ガスを凝縮させることにより臭
気成分を蒸気ガスの凝縮水と共に系外に排除し
て脱臭処理するように構成し、前記復水手段で
使用する冷却水の水源が電気浸透脱水装置本体
側で使用された濾材の洗浄排水であることを特
徴とする電気浸透脱水機の脱臭装置。 ２ 実用新案登録請求の範囲第１項記載の脱臭装
置において、復水手段が蒸気ガス通路内に水冷
式熱交換器を設置した表面式復水器であること
を特徴とする電気浸透脱水機の脱臭装置。 ３ 実用新案登録請求の範囲第１項記載の脱臭装
置において、復水手段が蒸気ガス通路内に冷却
水を散布する混合式復水器であることを特徴と
する電気浸透脱水機の脱臭装置。[Claims for Utility Model Registration] 1. For an electroosmotic dehydrator that supplies sludge as a material to be dehydrated between opposing electrodes and dehydrates the sludge through a filter medium by electroosmotic action, the sludge is removed during the dehydration process. an exhaust air guide path that collects steam gas containing odor components generated from the system and exhausts it out of the system;
and a condensing means installed in the exhaust air guide path to condense the steam gas by water cooling, and by condensing the collected steam gas with the condensing means, odor components are removed from the system together with the condensed water of the steam gas. Deodorization of an electro-osmotic dehydrator, characterized in that the water source of the cooling water used in the condensing means is wastewater from cleaning a filter medium used in the main body of the electro-osmotic dehydrator. Device. 2. The deodorizing device according to claim 1 of the utility model registration claim, characterized in that the condensing means is a surface type condenser with a water-cooled heat exchanger installed in the steam gas passage. Deodorizing equipment. 3 Utility Model Registration Scope of Claim 1 The deodorizing device for an electroosmotic dehydrator, characterized in that the condensing means is a mixing type condenser that sprays cooling water into the steam gas passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9712685U JPH0334264Y2 (en) | 1985-06-26 | 1985-06-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9712685U JPH0334264Y2 (en) | 1985-06-26 | 1985-06-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS625821U JPS625821U (en) | 1987-01-14 |
| JPH0334264Y2 true JPH0334264Y2 (en) | 1991-07-19 |
Family
ID=30963736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9712685U Expired JPH0334264Y2 (en) | 1985-06-26 | 1985-06-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0334264Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009508766A (en) * | 2005-09-19 | 2009-03-05 | セダ エス．ピー．エイ． | container |
-
1985
- 1985-06-26 JP JP9712685U patent/JPH0334264Y2/ja not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009508766A (en) * | 2005-09-19 | 2009-03-05 | セダ エス．ピー．エイ． | container |
| JP4728397B2 (en) * | 2005-09-19 | 2011-07-20 | セダ エス．ピー．エイ． | container |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS625821U (en) | 1987-01-14 |
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