JPH0639833Y2 - Wastewater purification device - Google Patents
Wastewater purification deviceInfo
- Publication number
- JPH0639833Y2 JPH0639833Y2 JP1988077814U JP7781488U JPH0639833Y2 JP H0639833 Y2 JPH0639833 Y2 JP H0639833Y2 JP 1988077814 U JP1988077814 U JP 1988077814U JP 7781488 U JP7781488 U JP 7781488U JP H0639833 Y2 JPH0639833 Y2 JP H0639833Y2
- Authority
- JP
- Japan
- Prior art keywords
- chlorine
- organic solvent
- aeration
- based organic
- waste water
- 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 - Lifetime
Links
- 239000002351 wastewater Substances 0.000 title claims description 40
- 238000000746 purification Methods 0.000 title claims description 6
- 238000005273 aeration Methods 0.000 claims description 53
- 239000003960 organic solvent Substances 0.000 claims description 42
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 41
- 239000000460 chlorine Substances 0.000 claims description 41
- 229910052801 chlorine Inorganic materials 0.000 claims description 41
- 238000007599 discharging Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000002904 solvent Substances 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- CYTYCFOTNPOANT-UHFFFAOYSA-N Perchloroethylene Chemical group ClC(Cl)=C(Cl)Cl CYTYCFOTNPOANT-UHFFFAOYSA-N 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229950011008 tetrachloroethylene Drugs 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000001364 causal effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005108 dry cleaning Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
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
- Activated Sludge Processes (AREA)
- Physical Water Treatments (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案はパークロルエチレンなどの塩素系有機溶剤を含
む水の排水設備に適用される排水浄化装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a waste water purification apparatus applied to a waste water drainage facility containing a chlorine-based organic solvent such as perchlorethylene.
（従来の技術） いま、ドライクリーナを例にとって、第２図に基づき従
来の排水処理装置を説明すると、水配管29を介してドラ
イクリーナ本体34の水分離器22に連通した排水貯溜タン
ク43が設けられ、該排水貯溜タンク43の傾斜底面下端部
には溶剤回収バルブ48が設けられている。この排水貯溜
タンク43にはポンプ45を介して曝気槽44が連設されてお
り、該曝気槽44には多孔性通気体が内蔵され、曝気用の
エアを気泡状に発生する。また、曝気槽44には排水廃棄
用の自動開閉弁49が設けられ、該自動開閉弁49は制御箱
50に連結されて自動的に開閉されるようになっている。
そして、制御箱50は前記ポンプ45にも接続されてその動
作を制御するようになっている。即ち、制御箱50には各
部装置を自動化するためのタイマー及びリレーが内蔵さ
れている。(Prior Art) Now, taking a dry cleaner as an example, a conventional wastewater treatment device will be described with reference to FIG. 2. A wastewater storage tank 43 communicating with a water separator 22 of a dry cleaner body 34 via a water pipe 29 will be described. A solvent recovery valve 48 is provided at the lower end of the inclined bottom surface of the waste water storage tank 43. An aeration tank 44 is connected to the drainage storage tank 43 via a pump 45, and a porous aeration body is built in the aeration tank 44 to generate aeration air in the form of bubbles. Further, the aeration tank 44 is provided with an automatic opening / closing valve 49 for waste water disposal, and the automatic opening / closing valve 49 is a control box.
It is connected to 50 and automatically opens and closes.
The control box 50 is also connected to the pump 45 to control its operation. That is, the control box 50 incorporates a timer and a relay for automating each unit.
上記構成からなる排水処理装置の作用について説明する
と、ドライクリーナ本体34の運転によって水分離器22か
ら排出された排水は、まず水配管29を通って排水貯溜タ
ンク43に貯溜される。ここで、例えば一日分の排水を貯
溜しておくと、排水中に含まれるパークロルエチレン等
の塩素系有機溶剤は水よりも比重が大きいため、排水貯
溜タンク43の底部に沈降して分離される。即ち、貯溜タ
ンク43は比重分離器として機能する。こうして沈降分離
したパークロルエチレン等は数日に１回バルブ48を開く
ことにより回収され、ドライクリーナ本体34の蒸留器
（図示せず）へ還流される。Explaining the operation of the waste water treatment apparatus having the above structure, the waste water discharged from the water separator 22 by the operation of the dry cleaner body 34 is first stored in the waste water storage tank 43 through the water pipe 29. Here, for example, if one day's worth of waste water is stored, the chlorine-based organic solvent such as perchlorethylene contained in the waste water has a larger specific gravity than water, so it settles and separates at the bottom of the waste water storage tank 43. To be done. That is, the storage tank 43 functions as a specific gravity separator. The perchlorethylene and the like thus separated by settling is recovered by opening the valve 48 once every several days, and is refluxed to a distiller (not shown) of the dry cleaner main body 34.
ところで、塩素系有機溶剤を水との比重差を利用して上
記の如く分離した後にも、タンク43内に残留する排水中
には未だ数百ppmの塩素系有機溶剤が溶存している。そ
こで、制御箱50のスイッチをONさせ、ポンプ45を動作さ
せることにより、排水貯留タンク43から曝気槽44に排水
を一定量だけ送給する。曝気槽44内では一定時間（約１
時間程度でよい。）の曝気が行なわれ、これによって塩
素系有機溶剤が殆ど含まれない排水となる。そして、曝
気が終了すると廃棄用の自動開閉弁49が自動的に開き、
浄化された排水を系外に廃棄する。その後、自動開閉弁
49が閉じられ、ポンプ45が作動して排水貯溜タンク43内
の排水が域一定量曝気槽44に送給され、上記の曝気およ
び廃棄の工程が繰り返される。By the way, even after the chlorine-based organic solvent is separated as described above by utilizing the difference in specific gravity from water, several hundred ppm of the chlorine-based organic solvent is still dissolved in the waste water remaining in the tank 43. Therefore, by turning on the switch of the control box 50 and operating the pump 45, a certain amount of waste water is sent from the waste water storage tank 43 to the aeration tank 44. Within the aeration tank 44, a certain time (about 1
Time is enough. ) Is aerated, which results in wastewater containing almost no chlorine-based organic solvent. Then, when the aeration is completed, the automatic open / close valve 49 for disposal automatically opens,
Dispose of the purified wastewater outside the system. After that, automatic open / close valve
49 is closed, the pump 45 is operated, the drainage in the drainage storage tank 43 is sent to the aeration tank 44 in a fixed amount, and the above aeration and disposal steps are repeated.
上記排水処理装置によれば、一定量の排水を一定時間曝
気することにより、排水中に含まれる塩素系有機溶剤濃
度を低下させかつ安定化させることができる。試験結果
によれば、曝気前の塩素系有機溶剤濃度が200ppm程度で
あった排水を１時間程度曝気することにより、塩素系有
機溶剤濃度を0.06ppmに低下させることが判明してい
る。According to the wastewater treatment device, the concentration of the chlorine-based organic solvent contained in the wastewater can be reduced and stabilized by aerating a certain amount of wastewater for a certain period of time. According to the test results, it was found that the chlorine-based organic solvent concentration was reduced to 0.06 ppm by aerating the wastewater whose chlorine-based organic solvent concentration was about 200 ppm before the aeration for about 1 hour.
また、作業者の操作が殆ど不要で、自動的に一定時間の
曝気が行なわれるため誤操作が防止され、汚れた排水を
誤って廃棄する危険性は皆無といっても良い程度にまで
回避できる。Further, since almost no operator operation is required and aeration is automatically performed for a certain period of time, erroneous operation is prevented, and there is no risk of accidentally discarding dirty drainage.
更に、連続バッチ式の曝気システムとしたため、簡単な
装置の付加で一日に多量の処理が可能である。Further, since the continuous batch type aeration system is used, a large amount of treatment can be performed per day by adding a simple device.
（考案が解決しようとする課題） 従って、塩素系有機溶剤を含む排水を一旦曝気槽44に送
り、そこで約１時間の曝気を行なうことにより、前記有
機溶剤の含有量を減少し安定した性能の排水が可能であ
り、上記の如く曝気処理後の塩素系有機溶剤濃度が0.1p
pmレベルを十分にクリアすることが判明している。その
結果を踏まえて上記従来装置では、曝気を１時間実施
後、排水する様に時間制御している。(Problems to be solved by the invention) Therefore, waste water containing a chlorine-based organic solvent is once sent to the aeration tank 44, and aeration is performed for about 1 hour there, so that the content of the organic solvent is reduced and stable performance is obtained. Drainage is possible, and the concentration of chlorine-based organic solvent after aeration treatment is 0.1 p
It has been found to clear the pm level sufficiently. Based on the results, in the above conventional apparatus, the time is controlled so that the aeration is performed for 1 hour and then the water is drained.
ところで、こうした制御の間に、例えば曝気槽44内に塩
素系有機溶剤粒が混入するようなことも起り兼ねない。
万一、塩素系有機溶剤粒が曝気槽44に混入した場合、塩
素系有機溶剤粒は比重差により曝気槽44の底に沈み、第
２図の構造から明らかな様に、曝気の効果が効き難く長
時間の曝気を必要とし、例えば１時間の曝気では１〜3p
pm程度の濃度が残り、十分な濃度減少につながらないこ
とになる。また、曝気に必要な供給空気が不足している
場合にも曝気は十分に行なわれず、１時間経過後であっ
ても高濃度の塩素系有機溶剤濃度をもつ排水を排出する
虞れがある。By the way, during such control, for example, chlorine-based organic solvent particles may be mixed in the aeration tank 44.
If chlorine-based organic solvent particles are mixed in the aeration tank 44, the chlorine-based organic solvent particles will sink to the bottom of the aeration tank 44 due to the difference in specific gravity, and as shown in the structure of Fig. 2, the effect of aeration is effective. Aeration for a long time is difficult and, for example, 1 to 3p for aeration for 1 hour.
A concentration of about pm remains, which does not lead to a sufficient concentration decrease. Further, even if the supply air required for aeration is insufficient, aeration is not sufficiently performed, and there is a possibility that wastewater having a high concentration of chlorine-based organic solvent may be discharged even after 1 hour.
本考案は、こうした万が一の場合をも想定してなされた
ものであり、排水の排出時に於ける塩素系有機溶剤濃度
を確認した上で、安全基準内であれば系外に排出し、所
定の時間を経過した後も同基準外にあるときは警報等に
より、その旨を知らせると共に系外への排出を停止して
おくように制御する安全性がより確保された排水浄化装
置を提供しようとするものである。The present invention has been made in the case of such an emergency, and after confirming the concentration of chlorine-based organic solvent at the time of drainage discharge, if it is within the safety standards, discharge it outside the system and If the standard is not satisfied even after a certain period of time has passed, an alarm will be provided to notify that effect and to provide a drainage purification system that ensures greater safety by controlling discharge to the outside of the system. To do.
（課題を解決するための手段） このため本考案は、塩素系有機溶剤を含有する排水を曝
気槽を介して浄化し、系外に排出する排水浄化装置にお
いて、前記曝気槽の気相内に塩素系有機溶剤ガス濃度セ
ンサを設け、同ガス濃度が所定値以下になったことを同
濃度センサが検知したとき作動して排水する自動開閉弁
を前記曝気槽に設けてなるもので、これを問題解決のた
めの手段とするものである。(Means for Solving the Problems) Therefore, the present invention is a wastewater purifying device for purifying wastewater containing a chlorine-based organic solvent through an aeration tank and discharging the wastewater to the outside of the system. A chlorine-based organic solvent gas concentration sensor is provided, and the aeration tank is provided with an automatic opening / closing valve that operates and drains when the concentration sensor detects that the gas concentration has dropped below a predetermined value. It is a means for solving problems.
（作用） 曝気工程で排気される気体中の塩素系有機溶剤ガス濃度
と排水中に含有する塩素系有機溶剤濃度には因果関係が
有るので、曝気工程で排気される塩素系有機溶剤ガス濃
度を塩素系有機溶剤ガス濃度センサで検知し、前以て設
定した基準値以下になったら自動開閉弁を開いて排出す
る。また、一定時間、例えば１時間曝気しても基準値以
下にならなかった場合は、異常信号を出力し警報等を発
すると共に、自動開閉弁は閉じたままにして浄化されて
いない排水は排出しない様にする。(Function) There is a causal relationship between the concentration of the chlorine-based organic solvent gas in the gas discharged in the aeration process and the concentration of the chlorine-based organic solvent contained in the wastewater. It is detected by a chlorine-based organic solvent gas concentration sensor, and when it falls below the preset reference value, the automatic open / close valve is opened and the gas is discharged. Also, if aeration is not performed for a certain period of time, for example, for one hour, it does not fall below the reference value, an abnormal signal is output and an alarm is issued, and the automatic open / close valve is closed and unpurified wastewater is not discharged. Like
（実施例） 以下、本考案を図示実施例に基づき詳しく説明する。(Embodiment) Hereinafter, the present invention will be described in detail based on illustrated embodiments.
第１図は本考案をドライクリーニング装置の排水処理に
適用した代表的な実施例を示す。FIG. 1 shows a typical embodiment in which the present invention is applied to wastewater treatment of a dry cleaning device.
以下、本実施例を第２図に示し既述した従来技術と相違
する点を中心に詳述する。なお、第１図において第２図
と同一符号が付してある部分は実質的に同一の部分であ
る。Hereinafter, the present embodiment will be described in detail focusing on the points different from the above-described conventional technique shown in FIG. In addition, in FIG. 1, the parts denoted by the same reference numerals as those in FIG. 2 are substantially the same parts.
まず、本実施例の構成につき説明すると、第１図に示す
如く曝気槽44の上面を排気ダクトを一部に有する蓋体で
被い、同曝気槽44の上部に空気槽を形成する。この上部
空気槽に塩素系有機溶剤ガス濃度センサ51を設ける。同
センサ51としては、例えば特開昭60-158345号で開示さ
れている塩素系有機溶剤ガスの濃度センサが適用でき
る。また、前記溶剤ガス濃度センサ51は排気ダクト52内
に設けることもできる。この塩素系有機溶剤ガス濃度セ
ンサ51は周囲の塩素系有機溶剤ガス濃度が設定した基準
値以下になったら信号を出す機能を有している。本実施
例において上部構成以外の部分は、第２図に示した従来
部分と同一である。First, the structure of this embodiment will be described. As shown in FIG. 1, the upper surface of the aeration tank 44 is covered with a lid partly having an exhaust duct, and an air tank is formed above the aeration tank 44. A chlorine-based organic solvent gas concentration sensor 51 is provided in this upper air tank. As the sensor 51, for example, a chlorine-based organic solvent gas concentration sensor disclosed in JP-A-60-158345 can be applied. Further, the solvent gas concentration sensor 51 may be provided in the exhaust duct 52. The chlorine-based organic solvent gas concentration sensor 51 has a function of outputting a signal when the concentration of the surrounding chlorine-based organic solvent gas becomes equal to or lower than a set reference value. In this embodiment, the parts other than the upper structure are the same as the conventional part shown in FIG.
以上の構成にあって排水の浄化処理を行なうときは、ま
ず排水貯溜タンク43よりポンプ45を介して曝気槽44に排
水を移送する。曝気槽44内の多孔性通気体より曝気用の
エアを気泡状に発生させ曝気する。浄化初期の段階は排
水中の塩素系有機溶剤濃度も高いため、曝気して排気さ
れる塩素系有機溶剤ガス濃度も高い。曝気を継続して実
施するに従い排水中の塩素系有機溶剤濃度も低下し、こ
れに伴い曝気して排気される塩素系有機溶剤ガス濃度も
低下する。排水中の塩素系有機溶剤濃度が基準値を、例
えば0.1ppmとした場合に、塩素系有機溶剤濃度がその基
準値になったときの曝気して排出される溶剤ガス濃度で
作動する様に上記溶剤ガス濃度センサ51の基準値を設定
する。塩素系有機溶剤ガス濃度センサ51が作動したら制
御箱50からの指令により自動開閉弁49を作動し、基準値
以下に浄化した排水を曝気槽44より排出する。When purifying the wastewater in the above configuration, the wastewater is first transferred from the wastewater storage tank 43 to the aeration tank 44 via the pump 45. Air for aeration is generated in the form of bubbles from the porous aeration body in the aeration tank 44 for aeration. Since the chlorine-based organic solvent concentration in the wastewater is high in the initial stage of purification, the concentration of the chlorine-based organic solvent gas aerated and discharged is also high. As the aeration is continuously performed, the concentration of the chlorine-based organic solvent in the waste water also decreases, and the concentration of the chlorine-based organic solvent gas discharged by the aeration also decreases accordingly. When the chlorine-based organic solvent concentration in the wastewater has a standard value of, for example, 0.1 ppm, the above-mentioned operation is performed at the solvent gas concentration discharged by aeration when the chlorine-based organic solvent concentration reaches the standard value. The reference value of the solvent gas concentration sensor 51 is set. When the chlorine-based organic solvent gas concentration sensor 51 operates, the automatic opening / closing valve 49 is operated according to a command from the control box 50, and the waste water purified to a reference value or less is discharged from the aeration tank 44.
一定時間、例えば１時間曝気した時、正常な曝気状態で
有れば0.06ppm以下の塩素系有機溶剤濃度になるが、曝
気槽44内に塩素系有機溶剤粒が混入し、或は曝気用空気
の供給不足等の異常が発生した場合は、長時間曝気して
も0.1ppm以下に浄化できない場合がある。When aeration is performed for a certain period of time, for example, 1 hour, the concentration of chlorine-based organic solvent is 0.06 ppm or less in the normal aeration state, but chlorine-based organic solvent particles are mixed in the aeration tank 44, or aeration air is used. If an abnormality such as insufficient supply of hydrogen occurs, it may not be possible to purify it to 0.1 ppm or less even after aeration for a long time.
そこで、本実施例ではタイマー等を利用して１時間曝気
後、塩素系有機溶剤ガス濃度が基準値以下とならない場
合は図示しないブザー等で異常警報を発して、曝気状態
に異常のあることを知らせ、このときは自動開閉弁49も
作動せず、塩素系有機溶剤濃度が基準値以下に浄化され
ていない場合は排水しない様にしている。Therefore, in this embodiment, when the chlorine-based organic solvent gas concentration does not fall below the reference value after aeration for 1 hour using a timer or the like, an abnormal alarm is issued by a buzzer or the like (not shown) to indicate that the aeration state is abnormal. At this time, the automatic opening / closing valve 49 does not operate at this time, and if the chlorine-based organic solvent concentration is not purified to the reference value or less, the drainage is not performed.
（考案の効果） 以上詳細に説明した如く本考案は、曝気槽に塩素系有機
溶剤ガス濃度が所定値以下になったことを濃度センサが
検知したときに作動して排水する自動開閉弁を設けたの
で、塩素系有機溶剤濃度が所定値以下になれば速やかに
浄化された排水のみが排出され、浄化されていない排水
は排出されない。また原液に溶剤が少なければ曝気時間
が短くても所定値以下になり、効率的に浄化できる。(Effect of the Invention) As described in detail above, in the present invention, the aeration tank is provided with the automatic opening / closing valve that is activated and drains when the concentration sensor detects that the concentration of the chlorine-based organic solvent gas is below a predetermined value. Therefore, if the concentration of the chlorine-based organic solvent falls below a predetermined value, only the purified wastewater is discharged promptly, and the unpurified wastewater is not discharged. Further, if the stock solution contains a small amount of solvent, even if the aeration time is short, it will be less than a predetermined value and can be efficiently purified.
第１図は本考案の代表的な実施例を示すドライクリーナ
における排水浄化装置の概略構成図、第２図は従来の同
排水処置装置の概略構成図である。 図の主要部分の説明 22……水分離器 29……水配管 34……ドライクリーナ本体 43……排水貯溜タンク 44……曝気槽 45……ポンプ 48……塩素系有機溶剤回収バルブ 49……自動開閉弁 50……制御箱 51……塩素系有機溶剤ガス濃度センサ 52……排気ダクトFIG. 1 is a schematic configuration diagram of a wastewater purification device in a dry cleaner showing a typical embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of the same conventional drainage treatment device. Description of the main parts of the figure 22 …… Water separator 29 …… Water piping 34 …… Dry cleaner main body 43 …… Drainage storage tank 44 …… Aeration tank 45 …… Pump 48 …… Chlorine organic solvent recovery valve 49 …… Automatic open / close valve 50 …… Control box 51 …… Chlorine organic solvent gas concentration sensor 52 …… Exhaust duct
Claims (1)
介して浄化し、系外に排出する排水浄化装置において、
前記曝気槽の気相内に塩素系有機溶剤ガス濃度センサを
設け、同ガス濃度が所定値以下になったことを同濃度セ
ンサが検知したとき作動して排水する自動開閉弁を前記
曝気槽に設けたことを特徴とする排水浄化装置。1. A waste water purifying apparatus for purifying waste water containing a chlorine-based organic solvent through an aeration tank and discharging the waste water to the outside of the system,
A chlorine-based organic solvent gas concentration sensor is provided in the gas phase of the aeration tank, and an automatic opening / closing valve that operates and drains when the concentration sensor detects that the gas concentration is below a predetermined value is provided in the aeration tank. Wastewater purification device characterized by being provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988077814U JPH0639833Y2 (en) | 1988-06-14 | 1988-06-14 | Wastewater purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988077814U JPH0639833Y2 (en) | 1988-06-14 | 1988-06-14 | Wastewater purification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH021294U JPH021294U (en) | 1990-01-08 |
| JPH0639833Y2 true JPH0639833Y2 (en) | 1994-10-19 |
Family
ID=31302774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988077814U Expired - Lifetime JPH0639833Y2 (en) | 1988-06-14 | 1988-06-14 | Wastewater purification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0639833Y2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS562887A (en) * | 1979-06-20 | 1981-01-13 | Toshiba Corp | Treatment of waste alkali washing liquid for deodorizing |
| JPH046709Y2 (en) * | 1986-07-25 | 1992-02-24 |
-
1988
- 1988-06-14 JP JP1988077814U patent/JPH0639833Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH021294U (en) | 1990-01-08 |
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