FI69968C - INJECTOR FOR FLOTATIONSAPPARATER - Google Patents

INJECTOR FOR FLOTATIONSAPPARATER Download PDF

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Publication number
FI69968C
FI69968C FI831093A FI831093A FI69968C FI 69968 C FI69968 C FI 69968C FI 831093 A FI831093 A FI 831093A FI 831093 A FI831093 A FI 831093A FI 69968 C FI69968 C FI 69968C
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FI
Finland
Prior art keywords
injector
constriction
mixing
mixing section
point
Prior art date
Application number
FI831093A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI69968B (en
FI831093A0 (en
FI831093L (en
Inventor
Peter Schweiss
Hans-Dieter Doerflinger
Original Assignee
Voith Gmbh J M
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Filing date
Publication date
Application filed by Voith Gmbh J M filed Critical Voith Gmbh J M
Publication of FI831093A0 publication Critical patent/FI831093A0/en
Publication of FI831093L publication Critical patent/FI831093L/en
Publication of FI69968B publication Critical patent/FI69968B/en
Application granted granted Critical
Publication of FI69968C publication Critical patent/FI69968C/en

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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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1294—"Venturi" aeration means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3121—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
    • B01F25/31241—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the circumferential area of the venturi, creating an aspiration in the central part of the conduit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
    • B01F25/4335—Mixers with a converging-diverging cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1418—Flotation machines using centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation
    • 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

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Dispersion Chemistry (AREA)
  • Microbiology (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Hydrology & Water Resources (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Nozzles (AREA)
  • Fish Paste Products (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Cyclones (AREA)
  • Paper (AREA)

Abstract

1. Flotation apparatus having an injector serving to introduce a mixture of gas and fluid into the flotation apparatus, the injector having a constriction and a mixing section (5) behind this and also a gas intake guided centrally into the constriction, characterised by the following features of the injector : a) the constriction (3, 4) widens abruptly towards the mixing section (5), b) the centrally guided gas intake (6) ends a short distance behind the constriction (3, 4) in the mixing section (5), c) the mixing section (5) has a second constriction (7) widening like a diffusor.

Description

1 699681 69968

Injektori vaahdotuslaitteita vartenInjector for flotation devices

Keksinnön kohteena on injektori patenttivaatimuksen 1 johdanto-osan mukaisesti.The invention relates to an injector according to the preamble of claim 1.

Tällainen injektori tunnetaan DE-hakemusjulkaisusta 2701702. Tässä injektorissa valmistetaan vaahdotussäiliön eteen kytketyssä säiliössä seos nesteestä, esim. suspensiosta ja kaasusta, esim. ilmasta, ennen kuin tämä syötetään varsinaiseen vaahdotuskennoon. Tässä injektorissa on järjestetty kaksi peräkkäin kytkettyä kuristuskohtaa, kuitenkin toinen kuristuskohta on järjestetty injektorista riippumattomasti ja kytketty tämän kanssa säätölaitteen kautta, joka tekee koko laitteesta hieman monimutkaisen ja määrätyllä tavalla myös häiriöherkän, mikä osoittaa, että se jo tästä syystä on sinänsä soveltumaton suurlaitoksessa tapahtuvaan vaahdotukseen. Tämän lisäksi tämä laite näyttää toimivan vain, kun injektori ja sen jälkeen kytketty se-koitusväli uppoaa olennaisesti pystysuorasti säiliöön. Myös tämä on seikka, joka tekee laitteesta soveltumattoman käytettäväksi erittäin suuriksi mitoitetuissa, esim. paperiteollisuuden siistauslaitosten vaahdotussäiliöissä.Such an injector is known from DE-A-2701702. In this injector, a mixture of liquid, e.g. suspension and gas, e.g. air, is prepared in a container connected in front of the flotation tank before it is fed into the actual flotation cell. This injector is provided with two successively connected throttling points, however, the second throttling point is arranged independently of the injector and connected to it via a control device, which makes the whole device a bit complicated and in some way sensitive to interference, indicating that it is unsuitable for flotation. In addition, this device appears to operate only when the injector and the subsequently connected mixing gap sink substantially vertically into the tank. This is also a factor which makes the device unsuitable for use in dimensioned flotation tanks of deinking plants, e.g. in the paper industry.

Keksinnön tehtävänä on saada aikaan yksinkertaisesti muodostettu injektori, joka soveltuu etenkin suuriin laitteistoihin. Sillä tulee tällöin olla hyvä hyötysuhde, so. etenkin mahdollistaa myös vaahdotettavan suspension perusteellinen sekoitus erittäin hienojen kaasukuplien kanssa optimaalisesti .The object of the invention is to provide a simply formed injector which is particularly suitable for large installations. It must then have a good efficiency, i.e. in particular, it also allows thorough mixing of the foamable suspension with very fine gas bubbles optimally.

Tämä tehtävä ratkaistaan keksinnön mukaisesti alussa mainitun tyyppisessä injektorissa patenttivaatimuksen 1 tun-nusmerkkiosan tunnusmerkeillä.According to the invention, this object is solved in an injector of the type mentioned at the beginning by means of the features of the characterizing part of claim 1.

Edullisia sovellutuksia on esitetty alivaatimuksissa, etenkin vaatimuksissa 2, 4 ja 5.Preferred applications are set out in the subclaims, in particular in claims 2, 4 and 5.

2 699682 69968

Seuraavassa keksintöä selitetään piirustuksessa esitetyn suoritusesimerkin avulla.In the following, the invention will be explained by means of an exemplary embodiment shown in the drawing.

Tällöin kuvio 1 a ja b esittävät keksinnön mukaista injektoria pit-kittäisleikkauskuvana pysty- ja vaakasuunnassa, kuvio 2 esittää injektorilaitetta, jossa on pystysuorasti järjestetty pyöreä, so. sylinterimäinen vaahdotussäiliö, ja kuvio 3 esittää injektorin erästä toista suoritusmuotoa.In this case, Figures 1a and b show the injector according to the invention in a longitudinal and horizontal sectional view in a vertical and horizontal direction, Fig. 2 shows an injector device with a vertically arranged circular, i. a cylindrical flotation tank, and Figure 3 shows another embodiment of the injector.

Vaahdotettava suspensio syötetään vaahdotussäiliöön 1 injektorin kautta sekoitettuna perusteellisesti erittäin hienojen kaasukuplien kanssa. Tässä injektorissa on ensinnäkin sylinterimäinen syöttöputki 2 suspensiota varten. Se päättyy välikalvoon 3 tai ei-laajennettuun suuttimeen 4. Tärkeää injektorin toiminnalle on, että nämä kavennuskohdat, jotka ovat sekoitusvälin 5 alussa, laajentuvat jyrkästi sekoitusväliksi 5. Kaasun, so. ilman syöttöputki 6 on viety keskeisesti suspension syöttöputken 2 viimeisessä osassa ja keskeisesti kavennuskohdan, so. välikalvon tai suuttimen läpi lyhyen matkaa sekoitusväliin 5.The suspension to be foamed is fed to the flotation tank 1 via an injector thoroughly mixed with very fine gas bubbles. First, this injector has a cylindrical feed tube 2 for the suspension. It terminates in a diaphragm 3 or a non-expanded nozzle 4. It is important for the operation of the injector that these constriction points, which are at the beginning of the mixing interval 5, expand sharply into a mixing interval 5. The gas, i. the air supply pipe 6 is passed centrally in the last part of the suspension supply pipe 2 and centrally to the constriction point, i.e. through the diaphragm or nozzle a short distance into the mixing interval 5.

Sekoitusväli 5 muodostuu olennaisesti suorakulmaisesta laatikosta, jossa on sylinterimäinen tulo-osa 9. Tällöin on laatikossa toinen kavennuskohta 7. Tämä kavennuskohta on järjestetty epäsymmetrisesti sekoitusvälin 5 ajatellun keskiviivan 8 suhteen. Olennaista sille on diffuusorimainen laajentuma tämän kavennuskohdan 7 kapeimman poikkileikkauksen takana. Tämän toisen kavennuskohdan avulla saadaan aikaan virtausprofiilin tasoittuminen, niin että sekoitusvälin 7 diffuusoriosan vaikutus tapahtuu optimaalisesti, so. saadaan aikaan suurin mahdollinen virtauksen paineenkorotus.The mixing space 5 consists of a substantially rectangular box with a cylindrical inlet part 9. The box then has a second constriction point 7. This constriction point is arranged asymmetrically with respect to the imaginary center line 8 of the mixing space 5. Essential to it is the diffuser-like expansion behind the narrowest cross-section of this constriction point 7. By means of this second narrowing point, the flattening of the flow profile is achieved, so that the effect of the diffuser part of the mixing gap 7 takes place optimally, i. the maximum possible pressure increase of the flow is obtained.

Tällöin nähdään kuviosta 2, että sekoitusväliin 5 liittyy i injektorin laatikkomainen sisäänvirtausosa 10. Tämä osa 10 t! 3 69968 on liitetty suunnilleen tangentiaalisesti vaahdotussäili-öön 1. Tällöin se päätyy sisäiseen, samankeskisestä säiliöön 1 järjestettyyn ohjaussylinteriin 11. Edelleen nähdään kuviosta 2 sivuaukko laatikon 10 säteittäisesti sisenunässä seinämässä, joka aukko on järjestetty laatikon alaosaan. Tämän ansiosta tapahtuu juuri sisäänvirtaavan suspension sekoittuminen vaahdotussäiliön 1 virtaukseen. On osoittautunut, että tällainen järjestely on erittäin edullinen vaahdotusvaikutukselle. Vielä ei ole edelleen esitetty, että suspensio virtaa ruuviviivamaisessa liikkeessä vaahdo-tussäiliössä ulommassa rengastilassa 12 ensin ylöspäin, missä poistetaan muodostunut vaahdotusvaahto, ja että tämän jälkeen virtaus suuntautuu jälleen alaspäin vaahdotussäiliön 1 pohjassa olevaan puhdistetun suspension poistoauk-koon 13.In this case, it can be seen from Fig. 2 that the box-like inflow part 10 of the injector is connected to the mixing gap 5. This part 10 t! 3,69968 is connected approximately tangentially to the flotation tank 1. It then ends in an internal guide cylinder 11 arranged in a concentric tank 1. A side opening in the radially inward wall of the box 10 is further seen in Fig. 2, which opening is arranged in the lower part of the box. As a result, it is the mixing of the inflowing suspension with the flow of the flotation tank 1. Such an arrangement has proven to be very advantageous for the flotation effect. It has not yet been shown that the suspension flows in a helical motion in the flotation tank in the outer annular space 12 first upwards, where the formed flotation foam is removed, and then flows again downwards to the purified suspension outlet 13 at the bottom of the flotation tank 1.

Erittäin edulliseksi on osoittautunut esitetty suoritusmuoto, jossa on suorakulmaiset poikkileikkaukset. Kuitenkin myös pyöreä, esim. elliptinen poikkileikkaus tulee kysymykseen. Samoin voi epäsymmetrisesti oleva toinen kaven-nuskohta olla järjestetty myös vaakasuunnan suhteen epäsymmetrisesti sekoitusväliin 5.The presented embodiment with rectangular cross-sections has proved to be very advantageous. However, a circular, e.g. elliptical cross-section is also possible. Likewise, the asymmetrically second narrowing point can also be arranged horizontally asymmetrically in the mixing space 5.

Kavennuskohdan tarkoituksena on tasoittaa virtausprofiilia ensimmäisen kavennuskohdan takana. Sen ansiosta, että se on järjestetty epäsymmetrisesti, siinä ei tarvitse olla liian pientä sisäpoikkileikkausta, niin että sen jälkeen kytketty diffuusori voi olla muodostettu melko lyhyeksi.The purpose of the reduction point is to smooth the flow profile behind the first reduction point. Due to the fact that it is arranged asymmetrically, it does not have to have too small an internal cross-section, so that the diffuser connected afterwards can be formed quite short.

Jos kavennuskohta tehtäisiin sen ollessa symmetrisesti järjestettynä erittäin ahtaaksi virtauksen saman tasaisen no-peusprofiilin aikaansaamiseksi, olisi diffuusoriosa tehtävä vastaavasti pitkäksi.If the constriction point were made very narrowly arranged in a symmetrically arranged manner in order to obtain the same uniform velocity profile of the flow, the diffuser section would have to be made correspondingly long.

Edulliseksi on osoittautunut, kun kaasunsyöttöputki 6 päätyy 50-70 mm sekoitusvälin 5 ahtaimman kohdan taakse. Tällöin syöttöputken läpimitta on 200 mm ja siirtymäkappaleenIt has proved advantageous when the gas supply pipe 6 ends 50-70 mm behind the narrowest point of the mixing gap 5. In this case, the diameter of the supply pipe is 200 mm and the transition piece

Claims (7)

1. Injektor för att leda en gas-vätskeblandning tili en skumbildningsanordning, vilken injektor uppvisar ett för-trängningsställe och en efter detta kopplad blandningssträcka, k än netecknad av följande kännetecken: a) förträngningsstället utvidgar sig abrupt till en blandningssträcka, b) genom förträngningsstället (3, 4) har införts centralt ett gastillförselrör (6) tili blandningssträckan (5), vilket rör avslutas kort efter förträngningsstället (3,4 ) i blandningssträckan (5), c) blandningssträckan (5) uppvisar ett andra förträngnings-ställe (7) som även det utvidgar sig diffusoraktigt, och d) blandningssträckan (5) bestär av en väsentligen rörformad konstruktion, som anslutits tili skumbildningsanordningen.An injector for conducting a gas-liquid mixture into a foam forming device, the injector having a displacement site and a mixing distance thereafter, k not characterized by the following features: a) the displacement site extends abruptly to a mixing distance; 3, 4) has been centrally inserted a gas supply tube (6) into the mixing section (5), which tube terminates shortly after the constriction site (3,4) in the mixing section (5), c) the mixing section (5) has a second constriction site (7). which also extends diffusively, and d) the mixing distance (5) consists of a substantially tubular structure which is connected to the foam forming device. 2. Injektor enligt patentkravet 1, kännetecknad av att det andra förträngningsstället (7) är osymmetriskt i förhällande tili blandningssträckans (5) utan förträngnings-ställe (7) tänkta mittlinje (8).An injector according to claim 1, characterized in that the second displacement point (7) is asymmetrical in relation to the median line (8) of the mixing distance (5) without the displacement point (7). 3. Injektor enligt patentkravet 1 eller 2, kännetecknad av att blandningssträckan uppvisar en cylinderformad början (9) och en övergängsdel som ansluter sig tili denna och förenar denna med anslutningsdelen som uppvisar ett rätvink-ligt tvärsnitt, och vid vilken början anordnats ett andra förträngningsställe (7).3. An injector according to claim 1 or 2, characterized in that the mixing section has a cylindrical beginning (9) and a transition part which adjoins it and joins it with the connection part which has a right angular cross-section, and at which the start is arranged a second constriction point ( 7).
FI831093A 1982-03-31 1983-03-30 INJECTOR FOR FLOTATIONSAPPARATER FI69968C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3211906 1982-03-31
DE3211906A DE3211906C1 (en) 1982-03-31 1982-03-31 Flotation apparatus injector

Publications (4)

Publication Number Publication Date
FI831093A0 FI831093A0 (en) 1983-03-30
FI831093L FI831093L (en) 1983-10-01
FI69968B FI69968B (en) 1986-01-31
FI69968C true FI69968C (en) 1986-09-12

Family

ID=6159837

Family Applications (1)

Application Number Title Priority Date Filing Date
FI831093A FI69968C (en) 1982-03-31 1983-03-30 INJECTOR FOR FLOTATIONSAPPARATER

Country Status (8)

Country Link
EP (1) EP0090234B1 (en)
JP (1) JPS58170557A (en)
AT (1) ATE29973T1 (en)
BR (1) BR8301765A (en)
DE (2) DE3211906C1 (en)
ES (1) ES279886Y (en)
FI (1) FI69968C (en)
NO (1) NO158998C (en)

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CH658481A5 (en) * 1983-02-18 1986-11-14 Escher Wyss Gmbh FLOTATION DEVICE FOR FLOTING FIBER FIBER SUSPENSION MADE FROM WASTE PAPER.
AT387407B (en) * 1984-01-09 1989-01-25 Escher Wyss Gmbh FLOTATION DEVICE FOR FLOTING FIBER FIBER SUSPENSION MADE FROM WASTE PAPER
DE3401161A1 (en) * 1984-01-14 1985-11-21 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Flotation device for the floatation of a fibre material suspension obtained from wastepaper
CH665962A5 (en) * 1985-07-19 1988-06-30 Escher Wyss Gmbh GASIFICATION DEVICE FOR A FLOTATION DEVICE AND ITS USE.
DE3526576A1 (en) * 1985-07-25 1987-02-05 Voith Gmbh J M LARGE FLOTATION CONTAINER
US4952308A (en) * 1986-12-10 1990-08-28 Beloit Corporation Pressurized flotation module and method for pressurized foam separation
US5022984A (en) * 1990-02-28 1991-06-11 The Black Clawson Company Froth flotation apparatus and method
DK2572778T3 (en) 2011-09-23 2017-06-06 Primetals Technologies Germany Gmbh Flotation machine with a dispersing nozzle and method for operating it
WO2015060382A1 (en) * 2013-10-23 2015-04-30 株式会社アース・リ・ピュア Microbubble generating device and contaminated water purifying system provided with microbubble generating device
CN112359626A (en) * 2020-11-13 2021-02-12 郑州磊展科技造纸机械有限公司 Pulp-feeding non-blocking jet flow distributor for flotation deinking machine

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CH581493A5 (en) * 1974-06-24 1976-11-15 Escher Wyss Ag Static mixer for in line mixing - having sudden expansion with secondary fluid injection just prior to it
FR2315988A1 (en) * 1975-06-30 1977-01-28 Saint Gobain Techn Nouvelles IMPROVEMENT ON FLOTATION CELLS FOR THE TREATMENT OF URBAN AND INDUSTRIAL EFFLUENTS
CH598407A5 (en) * 1975-09-30 1978-04-28 Escher Wyss Gmbh
DE2634496C2 (en) * 1976-07-31 1985-10-17 Bayer Ag, 5090 Leverkusen Injector for gassing a liquid
DE2634494C2 (en) * 1976-07-31 1983-04-14 Bayer Ag, 5090 Leverkusen New injectors for liquid gassing
NL7609275A (en) * 1976-08-20 1978-02-22 Envirotech Corp Flotation process with low turbulence level - pumps two ingredient medium into fluid with density and kinetic energy within set limits
DE2700049C3 (en) * 1977-01-03 1980-10-02 Oskar Werner Dipl.-Ing. 6463 Freigericht Pawel Flotation plant
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FR2484862B1 (en) * 1980-06-18 1984-09-14 Inst Nat Rech Chimique PROCESS AND DEVICE FOR TRANSFERRING GAS IN A LIQUID APPLICABLE IN PARTICULAR TO WATER TREATMENT, BIOTECHNOLOGY AND THE CHEMICAL INDUSTRY
DE3127290C2 (en) * 1981-07-10 1986-10-30 J.M. Voith Gmbh, 7920 Heidenheim Flotation device for processing waste paper

Also Published As

Publication number Publication date
BR8301765A (en) 1983-12-13
ES279886Y (en) 1985-06-01
ES279886U (en) 1984-11-16
NO158998C (en) 1988-11-23
NO831167L (en) 1983-10-03
FI69968B (en) 1986-01-31
FI831093A0 (en) 1983-03-30
JPS58170557A (en) 1983-10-07
EP0090234A3 (en) 1985-06-26
EP0090234A2 (en) 1983-10-05
ATE29973T1 (en) 1987-10-15
EP0090234B1 (en) 1987-09-30
FI831093L (en) 1983-10-01
DE3373876D1 (en) 1987-11-05
DE3211906C1 (en) 1988-12-01
NO158998B (en) 1988-08-15

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