BE840694A - Perfectionnements apportes aux procedes d'elimination des polluants azotes et de la dbo des eaux residuaires - Google Patents
Perfectionnements apportes aux procedes d'elimination des polluants azotes et de la dbo des eaux residuairesInfo
- Publication number
- BE840694A BE840694A BE166112A BE166112A BE840694A BE 840694 A BE840694 A BE 840694A BE 166112 A BE166112 A BE 166112A BE 166112 A BE166112 A BE 166112A BE 840694 A BE840694 A BE 840694A
- Authority
- BE
- Belgium
- Prior art keywords
- bod
- elimination
- processes
- waste water
- nitrogen pollutants
- Prior art date
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title 2
- 230000008030 elimination Effects 0.000 title 1
- 238000003379 elimination reaction Methods 0.000 title 1
- 239000003344 environmental pollutant Substances 0.000 title 1
- 238000000034 method Methods 0.000 title 1
- 229910052757 nitrogen Inorganic materials 0.000 title 1
- 239000002351 wastewater Substances 0.000 title 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/26—Activated sludge processes using pure oxygen or oxygen-rich gas
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S210/00—Liquid purification or separation
- Y10S210/902—Materials removed
- Y10S210/903—Nitrogenous
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Biological Treatment Of Waste Water (AREA)
- Water Treatment By Sorption (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/568,712 US3994802A (en) | 1975-04-16 | 1975-04-16 | Removal of BOD and nitrogenous pollutants from wastewaters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE840694A true BE840694A (fr) | 1976-08-02 |
Family
ID=24272416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE166112A BE840694A (fr) | 1975-04-16 | 1976-04-13 | Perfectionnements apportes aux procedes d'elimination des polluants azotes et de la dbo des eaux residuaires |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US3994802A (en:Method) |
| JP (1) | JPS5921680B2 (en:Method) |
| BE (1) | BE840694A (en:Method) |
| CA (1) | CA1066438A (en:Method) |
| DE (1) | DE2616212A1 (en:Method) |
| ES (1) | ES447056A1 (en:Method) |
| FR (1) | FR2307768A1 (en:Method) |
| GB (1) | GB1531534A (en:Method) |
| IT (1) | IT1058129B (en:Method) |
| SE (1) | SE428918B (en:Method) |
| ZA (1) | ZA761916B (en:Method) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540845A (zh) * | 2015-12-24 | 2016-05-04 | 武汉钢铁(集团)公司 | 焦化废水短程硝化反硝化处理工艺 |
Families Citing this family (87)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4162153A (en) * | 1976-04-12 | 1979-07-24 | Air Products And Chemicals, Inc. | High nitrogen and phosphorous content biomass produced by treatment of a BOD-containing material |
| US4056465A (en) * | 1976-04-12 | 1977-11-01 | Air Products And Chemicals, Inc. | Production of non-bulking activated sludge |
| USRE32429E (en) * | 1976-04-12 | 1987-06-02 | Air Products And Chemicals, Inc. | Production of non-bulking activated sludge |
| US4460471A (en) * | 1977-11-04 | 1984-07-17 | Reid John H | Flow-control process for an oxidation ditch |
| US4443338A (en) * | 1977-11-04 | 1984-04-17 | Reid John H | Conversion of plug flow and complete mix aeration basins to barrier oxidation ditches |
| AU523598B2 (en) * | 1977-11-04 | 1982-08-05 | John Hager Reid | Aeration ditch |
| US4278547A (en) * | 1977-11-04 | 1981-07-14 | Reid John H | Conservation of momentum in a barrier oxidation ditch |
| US4210528A (en) * | 1977-11-11 | 1980-07-01 | Thetford Corporation | Closed loop waste treatment and water recycling toilet system |
| US4173531A (en) * | 1977-11-23 | 1979-11-06 | Union Carbide Corporation | Nitrification-denitrification of wastewater |
| JPS5531461A (en) * | 1978-08-29 | 1980-03-05 | Niigata Eng Co Ltd | Denitrification of organic nitrogenous waste water |
| US4279753A (en) * | 1979-03-19 | 1981-07-21 | Arco Environmental Company | Wastewater treatment system including multiple stages of alternate aerobic-anerobic bioreactors in series |
| DE2918950A1 (de) * | 1979-05-10 | 1980-11-20 | Linde Ag | Verfahren und vorrichtung zur nitrifikation und denitrifikation von abwaessern |
| DE2936884A1 (de) * | 1979-09-12 | 1981-03-19 | Schreiber, August, Dr.-Ing., 3000 Hannover | Verfahren und einrichtung zur abwasserreinigung mittels belebtschlamm |
| DE3002604A1 (de) * | 1980-01-25 | 1981-07-30 | Basf Ag, 6700 Ludwigshafen | Verfahren und vorrichtung zur biologischen reinigung von abwasser |
| JPS5815038B2 (ja) * | 1980-02-21 | 1983-03-23 | 株式会社 西原環境衛生研究所 | 汚水処理装置 |
| ES8201507A1 (es) * | 1980-09-23 | 1981-12-16 | Pineda Felipe Sa | Procedimiento e instalacion para la depuracion de residuos contaminantes |
| DE3045158A1 (de) * | 1980-12-01 | 1982-07-01 | Linde Ag, 6200 Wiesbaden | Verfahren und vorrichtung zur biologischen reinigung von abwasser |
| US4537682A (en) * | 1982-01-29 | 1985-08-27 | Environmental Research & Technology | Activated sludge wastewater treating process |
| DE3206527A1 (de) * | 1982-02-24 | 1983-09-01 | Linde Ag, 6200 Wiesbaden | Verfahren und vorrichtung zur biologischen nitrifikation von abwasser |
| EP0099421B1 (en) * | 1982-07-21 | 1986-09-17 | Air Products And Chemicals, Inc. | Biological wastewater treating system |
| US4522722A (en) * | 1983-03-07 | 1985-06-11 | Air Products And Chemicals, Inc. | Nitrogen and phosphorus removal from wastewater |
| US4488967A (en) * | 1983-03-07 | 1984-12-18 | Air Products And Chemicals, Inc. | Treatment of wastewater containing phosphorus compounds |
| GB2155003B (en) * | 1984-01-20 | 1987-12-31 | Nishihara Env San Res Co Ltd | Activated sludge method |
| US4552663A (en) * | 1984-07-31 | 1985-11-12 | Air Products And Chemicals, Inc. | Process for the removal of ammoniacal nitrogen in the BOD sorption zone of a wastewater treatment plant |
| US4720344A (en) * | 1985-04-18 | 1988-01-19 | Ganczarczyk Jerzy J | Nitrification process in waste water treatment |
| SE456500B (sv) * | 1985-09-16 | 1988-10-10 | Boliden Ab | Forfarande for rening av vatten for eliminering av kveve |
| DE3545020A1 (de) * | 1985-09-28 | 1987-06-25 | Eppler Alwin | Verfahren zur biologischen denitrifizierung von wasser und vorrichtung zur durchfuehrung dieses verfahrens |
| US4839052A (en) * | 1987-03-10 | 1989-06-13 | Council For Scientific And Industrial Research | Biological treatment of water |
| WO1988008410A1 (en) * | 1987-04-21 | 1988-11-03 | Hampton Roads Sanitation District | High-rate biological waste water treatment process using activated sludge recycle |
| AU620402B2 (en) * | 1988-06-02 | 1992-02-20 | Orange Water And Sewerage Authority | Process for treating wastewater |
| US4874519A (en) * | 1988-06-02 | 1989-10-17 | Orange Water & Sewer Authority | Process for treating wastewater |
| US4961854A (en) * | 1988-06-30 | 1990-10-09 | Envirex Inc. | Activated sludge wastewater treatment process |
| US4975197A (en) * | 1989-05-03 | 1990-12-04 | Envirex Inc. | Orbal wastewater treatment process |
| FR2667057B1 (fr) * | 1990-09-25 | 1993-07-09 | Degremont | Reacteur perfectionne pour le traitement biologique des eaux residuaires. |
| US5332502A (en) * | 1990-11-02 | 1994-07-26 | The Commonwealth Industrial Gases Ltd. | Wastewater treatment |
| GB9118560D0 (en) * | 1991-08-30 | 1991-10-16 | Pirtferm Ltd | Process for degrading organic matter |
| US5160043A (en) * | 1991-09-09 | 1992-11-03 | I. Kruger, Inc. | Method of exhausting dissolved oxygen in a nitrogen removal wastewater treatment process |
| US5213681A (en) * | 1991-09-09 | 1993-05-25 | T. Kruger, Inc. | Method for biologically removing nitrogen from wastewater |
| US5288405A (en) * | 1993-01-27 | 1994-02-22 | Piedmont Olsen Hensley, Inc. | Wastewater treatment with enhanced biological phosphorus removal and related purification processes |
| US5490934A (en) * | 1993-08-30 | 1996-02-13 | Lawrence A. Schmid | Method of biological denitrification |
| US5480548A (en) * | 1993-12-28 | 1996-01-02 | Ch2M Hill, Inc. | Wastewater biological phosphorus removal process |
| US5783071A (en) * | 1994-01-11 | 1998-07-21 | Delta Environmental Products, Inc. | Apparatus for treating wastewater |
| US5714061A (en) * | 1994-01-11 | 1998-02-03 | Delta Environmental Products, Inc. | Apparatus for treating wastewater |
| DE4409435C2 (de) * | 1994-03-19 | 1995-06-14 | Ott Peter | Verfahren zur simultanen biologischen Phosphor- und Stickstoffelimination aus Abwasser |
| PL188698B1 (pl) * | 1995-06-22 | 2005-03-31 | Bisasco Pty Ltd | Sposób obróbki materiału odpadowego i urządzenie do obróbki materiału odpadowego |
| US5876603A (en) * | 1995-08-10 | 1999-03-02 | Hitachi Plant Engineering & Construction Co., Ltd. | Method of biologically removing nitrogen and system therefor |
| US5766454A (en) * | 1996-08-26 | 1998-06-16 | Delta Environmental Products, Inc. | Home wastewater treatment and denitrification system |
| DE19644080A1 (de) * | 1996-10-31 | 1998-05-07 | Messer Griesheim Gmbh | Verfahren und Vorrichtung zur biologischen Abwasserreinigung |
| EP0849230A1 (en) * | 1996-12-17 | 1998-06-24 | Krüger, Inc. | Dual-stage biological process for removing nitrogen from wastewater |
| EP1030821B1 (de) * | 1997-10-30 | 2001-08-22 | Süd-Chemie Ag | Verfahren zur denitrifikation von abwässern |
| CA2322696C (en) * | 1998-03-04 | 2009-08-11 | Mikkel G. Mandt | Surge anoxic mix sequencing batch reactor systems |
| IL127174A0 (en) | 1998-11-20 | 1999-09-22 | Almog Projects Ltd | Sewage treatment facility and method |
| US6217761B1 (en) | 1999-07-29 | 2001-04-17 | Delta Environmental Products, Inc. | Wastewater treatment system preventing the build up of solids beneath the clarifier opening |
| JP4082859B2 (ja) * | 2000-11-07 | 2008-04-30 | シャープ株式会社 | 中和装置 |
| US6592762B2 (en) | 2001-08-29 | 2003-07-15 | United States Filter Corporation | Process for treating BOD-containing wastewater |
| WO2003042118A1 (en) * | 2001-11-12 | 2003-05-22 | Shunsuke Takada | Method and device for purifying water |
| US6712970B1 (en) * | 2002-01-11 | 2004-03-30 | Enviroquip, Inc. | Sewage treatment process with phosphorus removal |
| US6692642B2 (en) * | 2002-04-30 | 2004-02-17 | International Waste Management Systems | Organic slurry treatment process |
| US6706185B2 (en) | 2002-05-22 | 2004-03-16 | Kurita Water Industries Ltd. | Biological method of phosphorus removal and biological phosphorus-removing apparatus |
| US6620322B1 (en) * | 2002-06-21 | 2003-09-16 | Smith & Vesio Llc | Apparatus and methods for purifying a waste influent material |
| US20050242044A1 (en) * | 2004-05-03 | 2005-11-03 | Weldon Couch | System, method, and apparatus for disinfecting wastewater systems |
| GB0411215D0 (en) * | 2004-05-20 | 2004-06-23 | Univ Cranfield | Waste water treatment |
| US7341660B1 (en) | 2004-10-07 | 2008-03-11 | Pentair Pump Group, Inc. | Unitary three stage wastewater treatment system |
| US7172699B1 (en) | 2004-10-13 | 2007-02-06 | Eimco Water Technologies Llc | Energy efficient wastewater treatment for nitrogen and phosphorus removal |
| CA2584148C (en) * | 2004-10-19 | 2015-02-24 | Hans Kuebler | Method and device for low-emission storage of biodegradable matter |
| DE602006020201D1 (de) * | 2005-01-26 | 2011-04-07 | Aquatech Ltd | Aerobes-anaerobes Verfahren zur Behandlung von organisch belasteten Abwässern |
| US7270750B2 (en) * | 2005-04-08 | 2007-09-18 | Ecofluid Systems, Inc. | Clarifier recycle system design for use in wastewater treatment system |
| GB2430793A (en) * | 2005-09-29 | 2007-04-04 | Bookham Technology Plc | Bragg grating reflection strength control |
| US20070221574A1 (en) * | 2006-03-27 | 2007-09-27 | Weldon Couch | System, method, and apparatus for aeration and processing waste in aerobic wastewater management |
| WO2008024445A2 (en) | 2006-08-23 | 2008-02-28 | Siemens Water Technologies Corp. | Sequencing batch reactor with continuous membrane filtration and solids reduction |
| EP2158165A4 (en) * | 2007-05-10 | 2012-04-18 | Patrick T O'regan Jr | SYSTEMS, METHODS AND COMPONENTS FOR WATER TREATMENT AND CORRECTIVE ACTION |
| US7927493B2 (en) * | 2007-05-11 | 2011-04-19 | Ch2M Hill, Inc. | Low phosphorus water treatment methods |
| CN101205100B (zh) * | 2007-12-18 | 2010-05-19 | 华南理工大学 | 城市污水一体化组合工艺处理反应器 |
| WO2010062724A2 (en) * | 2008-11-02 | 2010-06-03 | Nobska Technologies, Inc | Water treatment systems with communications network links and methods |
| US8545700B1 (en) * | 2009-02-24 | 2013-10-01 | University Of South Florida | Reduction and control of pH and soluble CO2 for optimal nitrification of wastewater |
| US8721887B2 (en) | 2009-12-07 | 2014-05-13 | Ch2M Hill, Inc. | Method and system for treating wastewater |
| SG186810A1 (en) * | 2011-01-19 | 2013-02-28 | Dream Engineering Co Ltd | Sewage treatment apparatus |
| WO2014084128A1 (ja) * | 2012-11-28 | 2014-06-05 | 独立行政法人石油天然ガス・金属鉱物資源機構 | 分離装置及び分離方法 |
| CN103693818B (zh) * | 2013-12-31 | 2014-12-10 | 北京京诚科林环保科技有限公司 | 焦化废水生化处理及沉淀池 |
| US9995758B1 (en) | 2014-10-31 | 2018-06-12 | Western Autotroph Company LLC | Methods and systems for controlling oxidative stress in humans and animals |
| CN110078214A (zh) * | 2019-05-21 | 2019-08-02 | 哈尔滨工业大学(威海) | 一种化粪池污泥发酵做碳源耦合脱氮一体化处理的方法 |
| CA3163327C (en) | 2020-01-06 | 2023-04-25 | The Research Foundation For The State University Of New York | Bioreactor system and method for nitrification and denitrification |
| CN111514858B (zh) * | 2020-04-15 | 2022-07-26 | 安徽大地熊新材料股份有限公司 | 一种稻壳基污水处理材料及其制备工艺 |
| CN111533258B (zh) * | 2020-05-07 | 2022-01-28 | 青岛理工大学 | 低温下分段进水多级缺/好氧的污水生物脱氮处理方法 |
| CN113321387A (zh) * | 2021-07-12 | 2021-08-31 | 深圳市润科环保应用技术研究有限公司 | 一种短流程农污一体化污水处理反应设备 |
| CN114162955B (zh) * | 2021-10-22 | 2023-09-22 | 中国市政工程中南设计研究总院有限公司 | 一种多点进水微氧循环式多级ao-mbr工艺污水处理系统及方法 |
| CN114702125B (zh) * | 2022-04-02 | 2023-04-07 | 襄阳先创环保科技有限公司 | 一种无接种活性污泥培养系统及方法 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2419492A (en) * | 1943-07-01 | 1947-04-22 | Infilco Inc | Sewage treatment |
| US2875151A (en) * | 1952-04-22 | 1959-02-24 | Schenley Ind Inc | Process for treatment of sewage |
| US3607736A (en) * | 1968-03-29 | 1971-09-21 | Kurita Water Ind Ltd | Method of treating organic waste water |
| US3654147A (en) * | 1971-03-16 | 1972-04-04 | Biospherics Inc | Nitrate removal from sewage |
| CH547235A (de) * | 1971-11-23 | 1974-03-29 | Attisholz Cellulose | Verfahren zur elimination von organisch und anorganisch gebundenem stickstoff aus haeuslichem und industriellem abwasser. |
| US3764523A (en) * | 1972-05-01 | 1973-10-09 | Union Carbide Corp | Nitrification of bod-containing water |
| US3846289A (en) * | 1972-06-19 | 1974-11-05 | Ecolotrol | Waste treatment process |
| JPS4931226A (en:Method) * | 1972-07-20 | 1974-03-20 | ||
| ZA725371B (en) * | 1972-08-04 | 1974-03-27 | South African Inventions | Improvements in and relating to waste water treatment |
| US3849303A (en) * | 1972-09-29 | 1974-11-19 | Autotrol Corp | Method and apparatus for upgrading wastewater treatment plants |
| US3864246A (en) * | 1973-01-24 | 1975-02-04 | Air Prod & Chem | Non-bulking activated sludge process |
| US3871999A (en) * | 1973-03-05 | 1975-03-18 | Autotrol Corp | Removal of pollutants from waste-water |
| JPS5214027B2 (en:Method) * | 1973-08-09 | 1977-04-19 | ||
| US3930998A (en) * | 1974-09-18 | 1976-01-06 | Sterling Drug Inc. | Wastewater treatment |
-
1975
- 1975-04-16 US US05/568,712 patent/US3994802A/en not_active Expired - Lifetime
-
1976
- 1976-02-05 GB GB458676A patent/GB1531534A/en not_active Expired
- 1976-03-30 CA CA249,166A patent/CA1066438A/en not_active Expired
- 1976-03-30 ZA ZA761916A patent/ZA761916B/xx unknown
- 1976-04-02 SE SE7603963A patent/SE428918B/xx not_active IP Right Cessation
- 1976-04-13 DE DE19762616212 patent/DE2616212A1/de not_active Ceased
- 1976-04-13 FR FR7610776A patent/FR2307768A1/fr active Granted
- 1976-04-13 BE BE166112A patent/BE840694A/xx not_active IP Right Cessation
- 1976-04-14 ES ES447056A patent/ES447056A1/es not_active Expired
- 1976-04-15 JP JP51043056A patent/JPS5921680B2/ja not_active Expired
- 1976-04-15 IT IT4904376A patent/IT1058129B/it active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540845A (zh) * | 2015-12-24 | 2016-05-04 | 武汉钢铁(集团)公司 | 焦化废水短程硝化反硝化处理工艺 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2616212A1 (de) | 1976-10-21 |
| GB1531534A (en) | 1978-11-08 |
| FR2307768A1 (fr) | 1976-11-12 |
| US3994802A (en) | 1976-11-30 |
| JPS5921680B2 (ja) | 1984-05-21 |
| SE428918B (sv) | 1983-08-01 |
| ES447056A1 (es) | 1977-10-01 |
| JPS51128157A (en) | 1976-11-08 |
| SE7603963L (sv) | 1976-10-17 |
| CA1066438A (en) | 1979-11-13 |
| IT1058129B (it) | 1982-04-10 |
| ZA761916B (en) | 1977-03-30 |
| FR2307768B1 (en:Method) | 1981-11-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| RE | Patent lapsed |
Owner name: AIR PRODUCTS AND CHEMICALS INC. Effective date: 19920430 |