JPS6128396B2 - - Google Patents
Info
- Publication number
- JPS6128396B2 JPS6128396B2 JP58138359A JP13835983A JPS6128396B2 JP S6128396 B2 JPS6128396 B2 JP S6128396B2 JP 58138359 A JP58138359 A JP 58138359A JP 13835983 A JP13835983 A JP 13835983A JP S6128396 B2 JPS6128396 B2 JP S6128396B2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- wastewater
- liquid circulation
- treated
- lid
- 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
- 238000000034 method Methods 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 230000001590 oxidative effect Effects 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 239000002351 wastewater Substances 0.000 claims description 7
- 238000005868 electrolysis reaction Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 239000010842 industrial wastewater Substances 0.000 claims description 4
- 239000010865 sewage Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 18
- 238000007254 oxidation reaction Methods 0.000 description 14
- 230000003647 oxidation Effects 0.000 description 13
- 238000011282 treatment Methods 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000007789 gas Substances 0.000 description 7
- 239000005416 organic matter Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 238000005262 decarbonization Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000006864 oxidative decomposition reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000006612 Kolbe reaction Methods 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000013626 chemical specie Substances 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-N chloric acid Chemical compound OCl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-N 0.000 description 1
- 229940005991 chloric acid Drugs 0.000 description 1
- 238000006114 decarboxylation reaction Methods 0.000 description 1
- 238000004042 decolorization Methods 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 238000007323 disproportionation reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000006385 ozonation reaction Methods 0.000 description 1
- 150000002989 phenols Chemical group 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 235000003441 saturated fatty acids Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Description
本発明は産業排水や都市下水中に含まれる各種
の有機物をオゾン酸化法、電解法および紫外線照
射法を併用することにより迅速かつ効果的に炭酸
ガスと水にまで酸化分解し、処理後のスラツジの
発生を極力抑える処理方法に関するものである。
オゾン酸化法は酸化処理法の一つであるが、そ
の最も大きな利点は常温常圧における酸化力が他
の酸化剤に比較して著しく高いことであり、この
強力な酸化力を利用して殺菌、脱臭、フエノール
やシアン化合物の分解、鉄やマンガンの酸化脱色
等に利用されているが、有機物に対するオゾンの
酸化作用は選択的であるため、これら有機物を炭
酸ガスや水にまで完全に分解することは困難であ
り、低分子のアルコール、ケトン、飽和脂肪酸ま
での分解で止まるため、これらが処理水中に残留
することになる。このため、これまでにもオゾン
酸化法による酸化力を増すための試みとして、電
解法や紫外線照射法との併用が行われている。す
なわち、電解法による水溶液の電解反応において
は陽極から酸素、陰極から水素が発生し、これら
によつて有機物の酸化あるいは還元が起こる。さ
らに不溶性電極を用いて食塩水の電解を行うと、
陽極では塩素、陰極では水素が発生し、電解液の
十分な混合が行われると、塩素は不均化反応によ
り次亜塩素酸となり、アルカリ性ではさらに塩素
酸となるので、これらの酸化力を利用することも
できる。また、Kolbe反応に見られるように飽和
カルボン酸の電解酸化により脱炭酸ガスが起こる
ことが知られている。このため、オゾン化反応に
よつて生成する物質の一部は、電解反応により脱
炭酸の過程を受ける。また、産業排水や都市下水
などの排水中に含まれる有機物の酸化分解として
ラジカルを利用する反応も考えられている。ラジ
カルは奇数の電子を持つた活性化学種で反応性に
富んでおり、その生成には熱、光、放射線等が利
用されている。オゾンは紫外〜可視の光を吸収し
て反応性に富む酸素原子と分子に解離することが
知られており、照射光源として低圧または高圧水
銀灯を用いて紫外線照射を行うと、次式に示すよ
O3＋hV→O2＋Ｏ*
Ｏ*＋H2O→2HO・
うに反応性に富む酸素原子Ｏ*が生成され、これ
が水と容易に反応して酸化性のラジカルである
HO・になり、このラジカルが有機物の酸化反応
の開始剤となり得る。
本発明は上述のようなオゾン酸化法と電解法の
併用ならびにオゾン酸化法と紫外線照射法の併用
の利点をさらに効果的に生かして有機物の酸化分
解を行うために、オゾン酸化法、電解法、紫外線
照射法の３つの処理法を効率的に併用し、同一反
応槽内でこれら３つの処理を同時に行うことを特
徴とするものである。
以下本発明による有機物の処理方法を添付の図
面に基づいて説明する。第１図は本発明による反
応槽の平面図、第２図は反応槽の上部断面図、第
３図は反応槽の下部断面図である。第１図におい
ては１は同筒状の反応槽であり、上蓋には電極支
持体７が設置されており、この電極支持体には必
要に応じた枚数の不溶性の陽極板１０ａおよび陰
極板１０ｂをセツトすることができ、これらの不
溶性電極には電源８により任意の電圧を印加する
ことができる。さらに、電極押え９を第２図の矢
印に示すような方向で電極支持体上をスライドさ
せることにより、任意の電極間距離を選択するこ
ともできる。また、底蓋には紫外線ランプ用の電
源１２に接続された紫外線ランプ１１および散気
装置１３設置されている。この紫外線ランプ１１
および散気装置１３の設置方法は、第３図に示さ
れるように中心部に紫外線ランプ１１があり、こ
の同心円状に４個の散気装置１３が設置されたも
のである。オゾン化ガスはオゾン発生機１５およ
び流量調節装置１４により濃度および流量を調整
された後、微細な細孔を有する散気装置１３によ
り処理水中に散気され、処理水と接触しながら上
昇し、排気口１６からの反応槽系外へ排出され、
ガス吸収塔１７を通つて大気中に排出される。処
理に際して、反応槽上部の原水入口２から処理原
水の一定量を反応槽中に満たし、処理液の一部は
循環ポンプ６を備えた循環系路により循環しなが
ら、適宜試料採取口４より処理水を採取し性状を
把握しつつ処理を行い、処理後の溶液を下部の処
理水出口３から取り出すものである。
次にこの処理装置を用いて処理した実施例を示
すことにする。供試排水としてエチレングリコー
ル100ppm水溶液を用いた。オゾンを生成するた
めに使用した原料ガスは酸素であり、生成された
オゾン化ガスの流量は５/min、濃度は19mg/
である。電解法は陽極および陰極ともにフエライ
ト板（100×100×６mm）を用い、電流密度2.1A/
ｄm2、電極間距離３cmであり、電導度を付加する
ためにNaClを1000ppm加えた。紫外線ランプは
短波長型のものを使用した。処理は３時間行い、
TOC（全有機炭素）の除去率をもつて処理の指
標とした。この処理方法の効果を比較する意味
で、オゾン酸化法と電解法との併用法、オゾン酸
化法と紫外線照射法との併用法、ならびにオゾン
酸化法、電解法および紫外線照射法を併せて行つ
た。その処理結果を第１表に示す。
The present invention rapidly and effectively oxidizes and decomposes various organic substances contained in industrial wastewater and urban sewage into carbon dioxide gas and water by combining ozone oxidation, electrolysis, and ultraviolet irradiation, and produces sludge after treatment. The present invention relates to a treatment method that minimizes the occurrence of The ozone oxidation method is one of the oxidation treatment methods, but its biggest advantage is that its oxidizing power at room temperature and pressure is significantly higher than other oxidizing agents, and it uses this strong oxidizing power to sterilize. Ozone is used for deodorization, decomposition of phenols and cyanide compounds, oxidative decolorization of iron and manganese, etc. However, since ozone's oxidizing effect on organic substances is selective, it completely decomposes these organic substances into carbon dioxide gas and water. This is difficult, and the decomposition stops at low-molecular alcohols, ketones, and saturated fatty acids, which end up remaining in the treated water. For this reason, attempts have been made to increase the oxidizing power of ozone oxidation by combining it with electrolysis and ultraviolet irradiation. That is, in an electrolytic reaction of an aqueous solution by an electrolytic method, oxygen is generated from the anode and hydrogen is generated from the cathode, and organic substances are oxidized or reduced by these. Furthermore, when electrolyzing saline water using an insoluble electrode,
Chlorine is generated at the anode and hydrogen is generated at the cathode. When the electrolyte is sufficiently mixed, the chlorine becomes hypochlorous acid through a disproportionation reaction, and in alkalinity it further becomes chloric acid, so the oxidizing power of these is utilized. You can also. Furthermore, as seen in the Kolbe reaction, it is known that decarbonation occurs through electrolytic oxidation of saturated carboxylic acids. Therefore, some of the substances produced by the ozonization reaction undergo a decarboxylation process by an electrolytic reaction. Reactions that utilize radicals for oxidative decomposition of organic matter contained in wastewater such as industrial wastewater and urban sewage are also being considered. Radicals are active chemical species with an odd number of electrons and are highly reactive, and heat, light, radiation, etc. are used to generate them. It is known that ozone absorbs ultraviolet to visible light and dissociates into highly reactive oxygen atoms and molecules.When irradiated with ultraviolet light using a low-pressure or high-pressure mercury lamp as the irradiation light source, ozone is O 3 + hV → O 2 + O * O * + H 2 O → 2HO・ Oxygen atoms O * , which are highly reactive, are generated, and this easily reacts with water to form oxidizing radicals.
becomes HO・, and this radical can serve as an initiator for the oxidation reaction of organic substances. The present invention utilizes the advantages of the combination of ozone oxidation method and electrolytic method as well as the combination of ozone oxidation method and ultraviolet irradiation method as described above to perform oxidative decomposition of organic matter. This method is characterized by efficiently using three treatment methods, including ultraviolet irradiation, and performing these three treatments simultaneously in the same reaction tank. The method for treating organic matter according to the present invention will be explained below based on the attached drawings. FIG. 1 is a plan view of a reaction tank according to the present invention, FIG. 2 is a sectional view of the top of the reaction tank, and FIG. 3 is a sectional view of the bottom of the reaction tank. In FIG. 1, reference numeral 1 denotes a cylindrical reaction tank, and an electrode support 7 is installed on the upper lid, and this electrode support has as many insoluble anode plates 10a and cathode plates 10b as required. can be set, and any voltage can be applied to these insoluble electrodes by the power source 8. Furthermore, by sliding the electrode holder 9 on the electrode support in the direction shown by the arrow in FIG. 2, an arbitrary inter-electrode distance can be selected. Furthermore, an ultraviolet lamp 11 connected to a power source 12 for the ultraviolet lamp and an air diffuser 13 are installed on the bottom cover. This ultraviolet lamp 11
As shown in FIG. 3, the air diffuser 13 is installed in such a manner that the ultraviolet lamp 11 is located in the center, and four air diffusers 13 are installed concentrically with the ultraviolet lamp 11. After the concentration and flow rate of the ozonized gas are adjusted by the ozone generator 15 and the flow rate adjustment device 14, it is diffused into the treated water by the aeration device 13 having fine pores, and rises while coming into contact with the treated water, is discharged to the outside of the reaction tank system from the exhaust port 16,
It passes through the gas absorption tower 17 and is discharged into the atmosphere. During treatment, a certain amount of raw water to be treated is filled into the reaction tank from the raw water inlet 2 at the top of the reaction tank, and a part of the treated liquid is circulated through a circulation system path equipped with a circulation pump 6 while being processed from the sample collection port 4 as appropriate. Water is sampled and treated while its properties are ascertained, and the treated solution is taken out from the treated water outlet 3 at the bottom. Next, an example of processing using this processing apparatus will be shown. A 100 ppm aqueous solution of ethylene glycol was used as the test wastewater. The raw material gas used to generate ozone was oxygen, and the flow rate of the generated ozonized gas was 5/min, and the concentration was 19 mg/min.
It is. The electrolytic method uses ferrite plates (100 x 100 x 6 mm) for both the anode and cathode, and the current density is 2.1 A/
dm 2 , the distance between the electrodes was 3 cm, and 1000 ppm of NaCl was added to add electrical conductivity. A short wavelength UV lamp was used. The treatment was carried out for 3 hours,
The removal rate of TOC (total organic carbon) was used as an indicator of treatment. In order to compare the effects of these treatment methods, we conducted a combined method of ozone oxidation and electrolysis, a combination of ozone oxidation and ultraviolet irradiation, and a combination of ozone oxidation, electrolysis, and ultraviolet irradiation. . The processing results are shown in Table 1.
【表】
この表に示されるように、３つの単独処理方法
ではTOCの減少が全く見られなかつたのに対し
て、オゾン酸化法と電解法との併用法およびオゾ
ン酸化法と紫外線照射法との併用法では有機物の
脱炭酸ガス化によりTOCの減少が見られている
が、さらにオゾン酸化法、電解法および紫外線照
射法を同時に併用することにより、より一層の
TOC除去効果が得られた。
以上、本発明によるオゾン酸化法、電解法およ
び紫外線照射法の同時併用処理により、産業排水
あるいは都市下水などの排水中に含まれる有機物
を効率よく酸化分解することができ、しかも脱炭
酸ガスによる完全分解のため処理後の汚泥の発生
が全く見られず、非常に有効な処理方法である。[Table] As shown in this table, no reduction in TOC was observed with the three individual treatment methods, while the combination of ozone oxidation and electrolytic methods and the ozone oxidation and ultraviolet irradiation methods Although a reduction in TOC has been observed due to the decarbonization of organic matter when using the combined method of
TOC removal effect was obtained. As described above, by the simultaneous combined treatment of ozone oxidation method, electrolytic method, and ultraviolet irradiation method according to the present invention, it is possible to efficiently oxidize and decompose organic substances contained in wastewater such as industrial wastewater or urban sewage, and moreover, completely remove the organic matter by decarbonization. Due to decomposition, no sludge is generated after treatment, making it a very effective treatment method.
第１図は本発明による反応槽の平面図、第２図
は反応槽の上部断面図、第３図は反応槽の下部断
面図である。
１……反応槽、２……原水入口、３……処理水
出口、４……試料採取口、５……循環口、６……
循環ポンプ、７……電極支持体、８……電源、９
……電極押え、１０……不溶性電極（１０ａ……
陽極板、１０ｂ……陰極板）、１１……紫外線ラ
ンプ、１２……紫外線ランプ用電源、１３……散
気装置、１４……流量調節装置、１５……オゾン
発生機、１６……排気口、１７……ガス吸収塔。
FIG. 1 is a plan view of a reaction tank according to the present invention, FIG. 2 is a top sectional view of the reaction tank, and FIG. 3 is a bottom sectional view of the reaction tank. 1... Reaction tank, 2... Raw water inlet, 3... Treated water outlet, 4... Sample collection port, 5... Circulation port, 6...
Circulation pump, 7... Electrode support, 8... Power supply, 9
... Electrode holder, 10 ... Insoluble electrode (10a ...
anode plate, 10b... cathode plate), 11... ultraviolet lamp, 12... power source for ultraviolet lamp, 13... air diffuser, 14... flow control device, 15... ozone generator, 16... exhaust port , 17... Gas absorption tower.
Claims (1)
各種有機物を酸化し、分解除去するに際して、円
筒体を、不溶性電極を懸垂した電極支持体と液循
環口と排気口を備えた上蓋と、中央部に上方に向
けて紫外線ランプを配設し、その周囲に微細な細
孔を持つ複数のオゾン化ガス散気装置を上方に向
けて配設し、さらに液循環口を有する底蓋とを用
いて密閉した構造の反応槽を用い、被処理排水を
該反応槽の上部から槽内に導入し、下部から槽外
へ抜出すと共に、該上蓋の電極支持体に懸垂した
不溶性電極により電解を行い、該下蓋に設けたオ
ゾン化ガス散気装置からオゾン化ガスを槽内に導
入し、該下蓋に設けた紫外線ランプから槽内に紫
外線を照射し、かつ該下蓋に設けた液循環口から
槽内の被処理排水を抜出し、該上蓋に設けた液循
環口を介して槽内に循環しながら、被処理排水を
処理することを特徴とする排水の処理方法。1. When oxidizing and decomposing various organic substances contained in wastewater such as industrial wastewater and urban sewage, the cylindrical body is divided into an electrode support with an insoluble electrode suspended therein, an upper lid equipped with a liquid circulation port and an exhaust port, and a center An ultraviolet lamp is arranged facing upward in the section, a plurality of ozonized gas diffusers with fine pores are arranged upward around the lamp, and a bottom cover with a liquid circulation port is used. Using a reaction tank with a closed structure, the wastewater to be treated is introduced into the tank from the top of the tank and extracted from the bottom of the tank, and electrolysis is performed using an insoluble electrode suspended from an electrode support on the top lid. , ozonated gas is introduced into the tank from an ozonized gas diffuser installed in the lower lid, ultraviolet rays are irradiated into the tank from an ultraviolet lamp installed in the lower lid, and liquid circulation is installed in the lower lid. A method for treating wastewater, characterized in that the wastewater to be treated is extracted from the tank through an opening and is circulated into the tank through a liquid circulation port provided in the upper lid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58138359A JPS6028884A (en) | 1983-07-28 | 1983-07-28 | Process and apparatus for treating waste water including electrolysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58138359A JPS6028884A (en) | 1983-07-28 | 1983-07-28 | Process and apparatus for treating waste water including electrolysis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6028884A JPS6028884A (en) | 1985-02-14 |
| JPS6128396B2 true JPS6128396B2 (en) | 1986-06-30 |
Family
ID=15220084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58138359A Granted JPS6028884A (en) | 1983-07-28 | 1983-07-28 | Process and apparatus for treating waste water including electrolysis |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6028884A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0720780U (en) * | 1992-11-27 | 1995-04-11 | 慎一郎 村山 | Cell phone cover |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4662327B2 (en) * | 2003-09-29 | 2011-03-30 | 三菱重工環境・化学エンジニアリング株式会社 | Wastewater treatment method and apparatus |
| JP2013039270A (en) * | 2011-08-18 | 2013-02-28 | Japan Atomic Energy Agency | Method for dechlorinating chlorinated aliphatic hydrocarbon compound and device for dechlorination |
| ES2373601B1 (en) * | 2011-10-14 | 2013-02-08 | I.D. Electroquímica, S.L. | WATER CLEANING PROCEDURE WITHOUT SALT CONTRIBUTION AND WATER CLEANING REACTOR. |
| JP6319719B2 (en) * | 2014-01-29 | 2018-05-09 | 三菱重工環境・化学エンジニアリング株式会社 | Waste water treatment method and waste water treatment equipment |
| JP6921503B2 (en) * | 2016-11-04 | 2021-08-18 | 株式会社東芝 | Water treatment equipment, water treatment system and water treatment method |
-
1983
- 1983-07-28 JP JP58138359A patent/JPS6028884A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0720780U (en) * | 1992-11-27 | 1995-04-11 | 慎一郎 村山 | Cell phone cover |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6028884A (en) | 1985-02-14 |
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