WO1996038383A1 - Procede d'epuration de liquides aqueux contamines par des polluants inorganiques et/ou organiques - Google Patents

Procede d'epuration de liquides aqueux contamines par des polluants inorganiques et/ou organiques Download PDF

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Publication number
WO1996038383A1
WO1996038383A1 PCT/DE1996/000970 DE9600970W WO9638383A1 WO 1996038383 A1 WO1996038383 A1 WO 1996038383A1 DE 9600970 W DE9600970 W DE 9600970W WO 9638383 A1 WO9638383 A1 WO 9638383A1
Authority
WO
WIPO (PCT)
Prior art keywords
fly ash
stirring
contaminated
carried out
suspension
Prior art date
Application number
PCT/DE1996/000970
Other languages
German (de)
English (en)
Inventor
Bernhard Zinke
Original Assignee
Bernhard Zinke
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
Priority claimed from DE19527006A external-priority patent/DE19527006C2/de
Application filed by Bernhard Zinke filed Critical Bernhard Zinke
Publication of WO1996038383A1 publication Critical patent/WO1996038383A1/fr

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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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/008—Sludge treatment by fixation or solidification

Definitions

  • the invention relates to a method for cleaning aqueous liquids contaminated with inorganic and / or organic pollutants according to the preamble of claim 1.
  • Contamination of soils and water with organic pollutants, for example oil, tar or phenols, and / or with inorganic pollutants represents a major environmental problem.
  • the invention has for its object to provide a method with which aqueous liquids contaminated with inorganic and / or organic pollutants can be cleaned in a simple, effective and cost-effective manner and a depositable or usable pollutant-bound sediment or filtrate as Immobilisat with seal building material character is provided.
  • the contaminated aqueous liquid is stirred with an active fly ash having a hollow spherical structure with a fly ash amount of 5-120%, based on the contaminated aqueous liquid, for a predetermined time, the fly ash having the following properties:
  • the fly ash contains 80-100%, in particular 90%, grain fraction with a diameter of less than 0.09 mm,
  • the specific surface is greater than 2500 g / cm.
  • the fly ash used according to the invention which has a swellable behavior, has an extremely high adsorption capacity of fine particles in aqueous solution and a very good absorptive binding capacity for such fine particles and solution products.
  • a quantity of fly ash of 30-120% is preferably used in the case of more severe contaminations.
  • the fly ash is mixed with the contaminated aqueous liquid, the pollutants being brought into intensive contact with the fly ash.
  • the pollutants are bound to the fly ash and immobilized in the alkaline environment.
  • a sedimentation process or a filtration process can be carried out in which the excess water is separated from the fly ash / pollutant mixture.
  • the process according to the invention can be used to remove contaminated aqueous liquids from inorganic and / or organic pollutants in a very simple, inexpensive and effective manner by utilizing the high adsorption and absorption capacity of the fly ash composition according to the invention with regard to organic and inorganic pollutants.
  • fly ash is a very inexpensive cleaning agent, which is a waste product in particular in lignite firing and would have to be disposed of as waste.
  • the fly ash "enriched" with the pollutants and immobilizing these pollutants can moreover be solidified without problems after removal of the purified excess water and can be shaped and used, for example, for structural purposes.
  • the high adsorption and absorption capacity of the fly ash for the pollutants ensures that the pollutants are not in again the environment are released, but remain bound to the fly ash.
  • a particularly good cleaning effect can be achieved if the stirring is carried out at a suspension density of less than 1.5 g / cm 3 .
  • a sedimentation process can be carried out to sediment the pollutant fly ash connection.
  • the fly ash provided with the pollutants settles on the floor, while the cleaned liquid, which is present as an alkaline immobilizing and pollutant-fixing liquid in the basic range above pH 7, is easily and "environmentally neutral” removed or can be used in a useful manner.
  • the sediment i.e. the pollutant-fly ash connection can be used and, if necessary, processed as an environmentally compatible construction material that hardens without shrinkage and guarantees long-term safe immobilization, integration and fixation.
  • the sediment it is possible to reactivate the sediment by adding cement, with which the strength and tightness of the sediment can be controlled.
  • the ratio of fly ash to cement is advantageously substantially greater than 1, ie. This means that, in comparison to the amount of fly ash, only very small amounts of cement have to be added.
  • this can be achieved by stirring the contaminated liquid suspension resulting from the fly ash can also be filtered by applying the suspension to a filter.
  • This filter can consist, for example, of the soil, ie the suspension is applied directly to the soil after stirring without waiting for the solid components to settle.
  • the fly ash remains together with the immobilized pollutants on the soil surface, while the cleaned excess water seeps through the soil or, depending on the nature of the soil, runs off on the soil surface. Since, as already stated, the pollutants remain firmly bound to the fly ash, this is possible without any risk to the environment.
  • cement can be added to the homogeneous, thin suspension, in particular at the end of the stirring process, in order to control the strength and tightness properties of the hardening constituents after the excess water has drained away.
  • the ratio of fly ash to cement is advantageously much larger than 1.
  • the hardening solid stabilizer can be used, for example, as a sealing material for shrink-free and joint-free applications, e.g. B. in landfill construction or as a filter press cake property such as building rubble without landfill safety problems or deposited.
  • the process according to the invention can preferably be used in sewage and seepage waters which have a high pollutant elution rate with regard to inorganic and organic pollutants in the form of very fine particles and solution products with an insufficient alkaline bond, as is the case, for example, with landfill leachate.
  • the process described can preferably be carried out in situ in the case of liquid waste loads in such a way that the aqueous liquid load is mixed with fly ash in such a way that a homogeneous, thin, but constantly thicker suspension with a final density of less than 1.5 kg / l is formed,
  • a stirring process or pump circulation process takes place (for larger liquid waste loads, for technical reasons also longer than 4 hours) and cement can be added as an activator in this process before sedimentation.
  • the largely purified water from the former liquid waste can be drawn off and, if necessary, cleaned, whereby the sediment is then either taken up as a building material (possibly re-mixing and activation with cement) or remains on the sole as a sealing material ( can be used simultaneously in combination with a sole renovation).
  • the process can be carried out using large agitators, e.g. Calculator agitators are used, whereby the cleaned water and sediment can be sucked off separately for the derivation and processing of the use, or as a thin liquid phase in a mixture for filtration via special equipment (eg filter press for sewage sludge) , resulting in purified water and a processable filter cake which binds the pollutants as a building material, which may still have to be reactivated with cement) or is released via the soil.
  • special equipment eg filter press for sewage sludge
  • the coupling of the preparation and transport of the stabilizer to be used should preferably be carried out using concrete mixers with drum contents of, for example, 6, 7, 9 or 12 m 3 , in which fly ash and the aqueous liquid to be cleaned are metered in and after the stirring process with or without cement activation as a low-viscosity mixing product.
  • product for filtration through apparatus or soil or as separate phases liquid after suction, sediment can be removed or used further.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

L'invention concerne un procédé d'épuration de liquides aqueux contaminés par des polluants inorganiques et/ou organiques, selon lequel on mélange, pendant un temps déterminé, le liquide aqueux contaminé avec des cendres volantes actives constituées de sphères creuses. La quantité de cendres volantes par rapport au liquide aqueux contaminé est comprise entre 5 et 120 %. Les cendres volantes ont les propriétés suivantes: (a) 80 à 100 %, notamment 90 % des grains qui constituent les cendres volantes ont un diamètre inférieur à 0,09 mm; (b) la valeur de pH des cendres volantes dans la solution aqueuse est supérieure à 12; (c) la teneur en CaO des cendres volantes est supérieure à 10 % en masse; et (d) la surface spécifique des cendres volantes est supérieure à 2500 g/cm2.
PCT/DE1996/000970 1995-06-02 1996-06-03 Procede d'epuration de liquides aqueux contamines par des polluants inorganiques et/ou organiques WO1996038383A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19520422.0 1995-06-02
DE19520422 1995-06-02
DE19527006A DE19527006C2 (de) 1995-06-02 1995-07-24 Verfahren zur Reinigung von mit anorganischen und/oder organischen Schadstoffen kontaminierten wässrigen Flüssigkeiten
DE19527006.1 1995-07-24

Publications (1)

Publication Number Publication Date
WO1996038383A1 true WO1996038383A1 (fr) 1996-12-05

Family

ID=26015733

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/000970 WO1996038383A1 (fr) 1995-06-02 1996-06-03 Procede d'epuration de liquides aqueux contamines par des polluants inorganiques et/ou organiques

Country Status (1)

Country Link
WO (1) WO1996038383A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2799664A1 (fr) * 1999-10-14 2001-04-20 Raymond Gleizes Procede de depollution de divers milieux a l'aide de residus de fumee d'incineration d'ordures menageres

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2339143A1 (de) * 1972-12-18 1974-06-20 Inst Energetik Verfahren zur reinigung von hydrophobe stoffe enthaltenden industrieabwaessern
GB1485625A (en) * 1973-06-01 1977-09-14 Chappell C Conversion of liquid hazardous wastes to solid form
US4226630A (en) * 1979-04-03 1980-10-07 Amax Resource Recovery Systems, Inc. Leach-resistant solid bodies from fly ash and heavy metal sludge
WO1988002739A1 (fr) * 1986-10-10 1988-04-21 Hölter Gmbh Procede de depollution de materiaux contamines et utilisation du produit ainsi obtenu
US4741834A (en) * 1986-05-08 1988-05-03 The Dow Chemical Company Method for underground support and removal of hazardous ions in ground waters
DE3732329A1 (de) * 1987-09-25 1989-04-13 Hoelter Heinz Verfahren zur aufbereitung von schwermetallhaltigen abwaessern
US4971702A (en) * 1989-08-22 1990-11-20 Western Research Institute Selenium adsorption process

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2339143A1 (de) * 1972-12-18 1974-06-20 Inst Energetik Verfahren zur reinigung von hydrophobe stoffe enthaltenden industrieabwaessern
GB1485625A (en) * 1973-06-01 1977-09-14 Chappell C Conversion of liquid hazardous wastes to solid form
US4226630A (en) * 1979-04-03 1980-10-07 Amax Resource Recovery Systems, Inc. Leach-resistant solid bodies from fly ash and heavy metal sludge
US4226630B1 (fr) * 1979-04-03 1986-06-24
US4741834A (en) * 1986-05-08 1988-05-03 The Dow Chemical Company Method for underground support and removal of hazardous ions in ground waters
WO1988002739A1 (fr) * 1986-10-10 1988-04-21 Hölter Gmbh Procede de depollution de materiaux contamines et utilisation du produit ainsi obtenu
DE3732329A1 (de) * 1987-09-25 1989-04-13 Hoelter Heinz Verfahren zur aufbereitung von schwermetallhaltigen abwaessern
US4971702A (en) * 1989-08-22 1990-11-20 Western Research Institute Selenium adsorption process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2799664A1 (fr) * 1999-10-14 2001-04-20 Raymond Gleizes Procede de depollution de divers milieux a l'aide de residus de fumee d'incineration d'ordures menageres

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