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WO2002044090A1 - Procédé de flottation pour nettoyer l'eau - Google Patents

Procédé de flottation pour nettoyer l'eau Download PDF

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Publication number
WO2002044090A1
WO2002044090A1 PCT/EP2001/013804 EP0113804W WO0244090A1 WO 2002044090 A1 WO2002044090 A1 WO 2002044090A1 EP 0113804 W EP0113804 W EP 0113804W WO 0244090 A1 WO0244090 A1 WO 0244090A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
flotation
purified
gas
pure nitrogen
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.)
Ceased
Application number
PCT/EP2001/013804
Other languages
German (de)
English (en)
Inventor
Juraj Petrovic
Joachim Rohovec
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Griesheim GmbH
Messer Tatragas sro
Original Assignee
Messer Griesheim GmbH
Messer Tatragas sro
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Messer Griesheim GmbH, Messer Tatragas sro filed Critical Messer Griesheim GmbH
Publication of WO2002044090A1 publication Critical patent/WO2002044090A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation

Definitions

  • the invention relates to a method for flotation of water for purifying the water from ingredients, according to the features of the preamble of claim 1.
  • Compressed gas source via a product line to a mechanical or hydraulic or pneumatic flotation device of different arrangement and design and introduced into the water to be cleaned by means of this flotation device.
  • the undissolved hydrophobic constituents accumulate in the hydrophilic gas bubbles formed as a result of the compressed air dispersed in the water and are transported to the water surface by means of the gas bubbles and removed as foam.
  • Waste material obtained from the foam after a further aftertreatment is disposed of in different ways, for example by landfill storage or by incineration.
  • the above-described flotation process is used to separate fibrous, flaky, greasy or oily substances.
  • Flotation is used in biological wastewater treatment to separate and concentrate sewage sludge.
  • gassing flotation a gas flow consisting of a sucked or pumped gas, usually from compressed air, is introduced into the water by means of mechanically operated rotor / stator systems or hydraulically operated liquid pumps or pneumatically operated gas compressors, nozzles or porous gassing surfaces.
  • Hydraulic or pneumatic are preferred especially for water purification Flotation devices are used to generate bubble sizes from 100 ⁇ m to a few 100 ⁇ m.
  • the water is saturated with a compressed gas to generate bubbles in a size range of approximately 50 ⁇ m to 100 ⁇ m and then this gas is expanded to a lower pressure in the flotation device than the entry pressure.
  • the waste material obtained through a foam aftertreatment is disposed of in different ways, for example by landfill storage or by incineration.
  • the invention has for its object to provide a method of the type described above, by means of which inexpensive water purification is possible while avoiding additional water contamination by oil entry.
  • the object is achieved in that pure nitrogen is introduced by means of at least one hose gasifier arranged in the water to be cleaned in the flotation chamber of the flotation device.
  • cryogenic liquid nitrogen with a nitrogen content of at least 99.5% by volume is fed to a cryogenic liquid container.
  • the pure cold stored in the pressure vessel at a pressure of 10 to 16 bar If necessary, liquid nitrogen is fed via a product line to an evaporator operated with process or external energy and evaporated to gaseous pure nitrogen.
  • the pure nitrogen, which is now in gaseous form, is introduced via a product line into a quantity and pressure control device and regulated to an operating pressure of 2 to 8 bar.
  • Flow control A temperature of approx. 15 ° C and a pressure of 2 to 8 bar pure nitrogen is introduced into the water to be cleaned by at least one gassing hose arranged in the wastewater to be cleaned in the flotation chamber of a flotation device.
  • the hydrophobic solid particles undissolved in the water attach to the hydrophilic gas bubbles formed by the dispersion of the gaseous nitrogen in the water and are transported with the gas bubbles to the water surface and removed from it as a foam.
  • the waste material generated by post-treatment of the foam removed from the water surface is disposed of, for example, by landfill storage or incineration.
  • the adhesion of the hydrophobic solid particles to the hydrophilic gas bubbles is adjusted by adding suitable flotation agents.
  • the hose fumigator used according to the invention for gassing the waste water contained in the flotation chamber of the flotation device consists of a thick-walled rubber hose (EPDM) perforated with a large number of pores with a variable diameter, different wall thickness and length, which can be used as a single hose or in a large number of Hoses are arranged in different ways in the wastewater.
  • EPDM thick-walled rubber hose
  • the hose pores which only open at an overpressure of 0.5 bar, prevent the hose from becoming blocked, even during long downtimes. Due to the high pressure loss in the hose wall, the pressure drop in the hose due to the flow is practically meaningless. This results in even outgassing even with a hose length of more than 100 m.
  • the operating pressure between 2 and 8 bar of the nitrogen to be injected into the water results from the sum of the pressure loss in the supply line to the gassing hoses, and the pressure necessary to open the hose pores Overpressure and the pressure necessary to overcome the hydrostatic pressure over the gassing hose.
  • 0.1 to 0.9 m 3 of nitrogen (N 2 ) per meter of hose length and hour can be applied to the gassing hose and the resulting total length must be arranged in the waste water introduced into the flotation chamber of the flotation device.
  • the single figure of the drawing shows how a cryogenic liquid nitrogen with a nitrogen content of at least 99.5% by volume is fed to a vacuum and / or pearlite-insulated liquid gas pressure container 1.
  • the cryogenic liquid nitrogen temporarily stored in the LPG pressure vessel 1 at a pressure of 10 to 16 bar is fed to an evaporator 2 connected to the LPG pressure vessel 1 through a product line and evaporates in this evaporator 2 operated with process or external energy to form gaseous nitrogen, which is brought to an operating pressure of 2 to 8 bar in a quantity and pressure regulator unit 3 connected to the evaporator 2 by a product line.
  • the pure nitrogen which is now at a temperature of 15 ° C. and at a pressure of 2 to 8 bar, is introduced into the flotation chamber 5 of a flotation device by at least one tube gasifier 4
  • the hydrophobic solid particles attach to the hydrophilic gas bubbles that form due to the dispersion of the gaseous nitrogen in the waste water and are transported with the gas bubbles to the water surface and are removed from there as a foam.
  • the waste material obtained from the foam as a result of post-treatment is disposed of, for example, by landfill storage or incineration.
  • the gassing hoses perforated with a large number of fine pores, thick-walled and made of rubber (EPDM) and arranged individually or in a variety in different ways in the wastewater to be cleaned have variable diameters, different wall thicknesses and lengths of more than 100 m.
  • the hose pores which only open at an overpressure of 0.5 bar, prevent the gassing hoses from becoming clogged, even during long downtimes.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physical Water Treatments (AREA)

Abstract

L'invention concerne un procédé de flottation pour nettoyer l'eau des matières qu'elle contient, selon lequel un gaz sous pression est introduit dans l'eau à nettoyer au moyen d'un dispositif de flottation. Les bulles de gaz hydrophiles se dispersant dans l'eau transportent les matières hydrophobes qui se fixent sur lesdites bulles vers la surface de l'eau, où elles sont éliminées sous forme de mousse. L'invention est caractérisée en ce que de l'azote pur est envoyé dans l'eau à nettoyer au moyen d'au moins un tuyau d'adduction de gaz, ne nécessitant pas d'apport énergétique supplémentaire, d'où un nettoyage de l'eau peu onéreux. En outre, l'adduction de gaz par tuyau évite la pollution de l'eau à nettoyer par d'autres substances nocives telles que l'huile, par exemple.
PCT/EP2001/013804 2000-11-30 2001-11-27 Procédé de flottation pour nettoyer l'eau Ceased WO2002044090A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10059441.7 2000-11-30
DE2000159441 DE10059441A1 (de) 2000-11-30 2000-11-30 Verfahren zur Flotation von Wasser

Publications (1)

Publication Number Publication Date
WO2002044090A1 true WO2002044090A1 (fr) 2002-06-06

Family

ID=7665233

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/013804 Ceased WO2002044090A1 (fr) 2000-11-30 2001-11-27 Procédé de flottation pour nettoyer l'eau

Country Status (2)

Country Link
DE (1) DE10059441A1 (fr)
WO (1) WO2002044090A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2454265C1 (ru) * 2011-02-16 2012-06-27 Федеральное казенное предприятие "Научно-испытательный центр ракетно-космической промышленности" Способ очистки жидкости от растворенных и диспергированных примесей и устройство для очистки жидкости от растворенных и диспергированных примесей

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066540A (en) * 1974-09-12 1978-01-03 Agency Of Industrial Science & Technology Apparatus and method for continuous froth flotation
US4186087A (en) * 1977-04-22 1980-01-29 Director-General Of Agency Of Industrial Science And Technology Method and apparatus for separating substances from liquids by flotation using bubbles
DE4424825A1 (de) * 1994-07-14 1996-01-18 Gabler Ing Kontor Luebeck Verfahren zum Entsorgen von entladenen und geladenen elektrischen Feststoff-Batterien
JPH11104615A (ja) * 1997-10-03 1999-04-20 Mitsubishi Chemical Corp コークス炉ガスから発生するガス液の処理方法
DE19828502A1 (de) * 1998-06-26 1999-12-30 Khs Masch & Anlagenbau Ag Verfahren zur flotativen Vorklärung trüber Flüssigkeiten

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4961325A (en) * 1989-09-07 1990-10-09 Union Carbide Corporation High pressure gas supply system
DE19644080A1 (de) * 1996-10-31 1998-05-07 Messer Griesheim Gmbh Verfahren und Vorrichtung zur biologischen Abwasserreinigung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066540A (en) * 1974-09-12 1978-01-03 Agency Of Industrial Science & Technology Apparatus and method for continuous froth flotation
US4186087A (en) * 1977-04-22 1980-01-29 Director-General Of Agency Of Industrial Science And Technology Method and apparatus for separating substances from liquids by flotation using bubbles
DE4424825A1 (de) * 1994-07-14 1996-01-18 Gabler Ing Kontor Luebeck Verfahren zum Entsorgen von entladenen und geladenen elektrischen Feststoff-Batterien
JPH11104615A (ja) * 1997-10-03 1999-04-20 Mitsubishi Chemical Corp コークス炉ガスから発生するガス液の処理方法
DE19828502A1 (de) * 1998-06-26 1999-12-30 Khs Masch & Anlagenbau Ag Verfahren zur flotativen Vorklärung trüber Flüssigkeiten

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
HUANG C J ET AL: "Precipitate flotation of fluoride-containing wastewater from a semiconductor manufacturer", WATER RESEARCH, ELSEVIER SCIENCE PUBLISHERS, AMSTERDAM, NL, vol. 33, no. 16, November 1999 (1999-11-01), pages 3403 - 3412, XP004243749, ISSN: 0043-1354 *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 09 30 July 1999 (1999-07-30) *
RAICHUR A M ET AL: "Flocculation and flotation of coal by adhesion of hydrophobic Mycobacterium phlei", COLLOIDS AND SURFACES B: BIOINTERFACES, ELSEVIER SCIENCE PUBLISHERS, AMSTERDAM, vol. 8, no. 1-2, 1996, pages 13 - 24, XP002198102 *
SCHORIES G ET AL: "BELEBTSCHLAMMABTRENNUNG MIT EINER PNEUMATISCHEN FLOTATIONSZELLE", KORRESPONDENZ ABWASSER, ABWASSERTECHNISCHE VEREINIGUNG, ST. AUGUSTIN, DE, vol. 44, no. 1, 1997, pages 88 - 90,93-98, XP000680249, ISSN: 0341-1540 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2454265C1 (ru) * 2011-02-16 2012-06-27 Федеральное казенное предприятие "Научно-испытательный центр ракетно-космической промышленности" Способ очистки жидкости от растворенных и диспергированных примесей и устройство для очистки жидкости от растворенных и диспергированных примесей

Also Published As

Publication number Publication date
DE10059441A1 (de) 2002-06-20

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