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WO1995021709A1 - Procede et dispositif de nettoyage d'un sol pollue - Google Patents

Procede et dispositif de nettoyage d'un sol pollue Download PDF

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Publication number
WO1995021709A1
WO1995021709A1 PCT/NL1995/000057 NL9500057W WO9521709A1 WO 1995021709 A1 WO1995021709 A1 WO 1995021709A1 NL 9500057 W NL9500057 W NL 9500057W WO 9521709 A1 WO9521709 A1 WO 9521709A1
Authority
WO
WIPO (PCT)
Prior art keywords
soil
organic solvent
heated medium
solvent
polluted
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/NL1995/000057
Other languages
English (en)
Inventor
Henricus Jozef Hubertus Brouwers
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.)
Twente Universiteit
Original Assignee
Twente Universiteit
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 Twente Universiteit filed Critical Twente Universiteit
Priority to AU15918/95A priority Critical patent/AU1591895A/en
Publication of WO1995021709A1 publication Critical patent/WO1995021709A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation

Definitions

  • the present invention relates to a method for cleaning polluted soil and the like, more particularly for removing not easily removable substances from the soil, such as hexachlorocyclohexane and polycyclic aromatic hydrocarbons, referred to hereafter as HCH and PAHs respectively.
  • HCH and PAHs hexachlorocyclohexane and polycyclic aromatic hydrocarbons
  • the term 'soil' should be understood in the broad sense. It covers, among other things, also sand-like residues such as construction waste, which often contain PAHs in particular.
  • the present invention provides a method for cleaning polluted soil, resulting in very thorough cleaning in an effective and relatively cheap way.
  • the method includes at least two steps, i.e. a first step in which the soil is treated with an organic solvent and a subsequent step in which the same soil is treated with a heated medium.
  • Treatment of the soil in this way enables the choice of a solvent for the treatment of the soil that effectively removes particular pollutants from the ground.
  • the solvent itself constitutes a pollution of the soil that can only be removed from the soil through heating.
  • the organic solvent used is an apolar organic solvent, such as hexane, pentane, or mixtures of alkanes (for example cleaning spirit) of which it is known that they are very effective for removing particular apolar pollutants such as mineral oil, HCH and PAHs from the soil.
  • the organic solvent can be introduced -into the soil in the form of a fluid. However, it is also possible and under certain circumstances preferable to introduce the solvent into the soil in the form of vapour (heated) .
  • the heated medium can be water in the form of hot water and/or steam, and it is also possible to use hot air as the medium.
  • the method according to the present invention is suitable for the removal of mineral oil, HCH and/or PAHs from polluted soil.
  • the method permits application at the polluted site, i.e. without the soil being dug off.
  • a plurality of pipes is inserted into the soil which introduce both the organic solvent and the heated medium into the soil successively. This introduction can occur below or slightly above the groundwater table, and is itself a known technique and disclosed in GB-A-2 098 644 for example.
  • the present invention relates to the device for applying the method for cleaning polluted soil, which device can be provided with a tubing system to be disposed in the non-dug off soil or with means for introducing an organic solvent and subsequently a heated medium into the dug-off soil.
  • HCH was produced particularly in the 1948-1952 period, during which period much production waste was dumped, usually in the environs of the production site.
  • HCH is associated with various problems. Firstly, it is a toxic substance which is a public health threat. Further, this substance causes stench. Yet another problem is that HCH is difficult to remove from the soil, which is caused by its poor solubility in water and in many other solvents and the relatively high boiling points of the various HCHs. Soil polluted with HCH will ultimately not only contain HCH but also, for example, chlorobenzene and other products created by the slow disintegration of HCH in the soil. This occurs particularly in calcareous soil .
  • hexane After the hexane treatment a certain amount of hexane remains in the soil, which in itself constitutes a new pollution of the soil.
  • hexane has a low boiling point, far below 100 °C, it appears that the hexane is completely removable from the soil by treating the soil with water in the form of steam. Because of the difference between the boiling point of water and the boiling point of hexane the steam and hexane mixture can be easily separated, so that the hexane is reusable. Because of the poor miscibility of hexane and water and because of the difference in densities, the two substances can be easily separated in the fluid phase also.
  • the intensity of cleaning can be increased by carrying out the treatments of the soil under pressure, for example a pressure of 1.5 to 3 bar.
  • the method disclosed herein first replaces the existing pollution in the polluted soil by another pollutant, after which the other pollutant is removed from the soil during subsequent treatment.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Procédé de nettoyage d'un sol pollué ou analogue, consistant au moins à traiter le sol à l'aide d'un solvant organique puis à le traiter à l'aide d'un milieu chauffé. Le solvant peut être un solvant organique apolaire tel que l'hexane ou le pentane ou un mélange d'alcanes, et on peut l'injecter dans le sol sous forme liquide ou vaporisée (chauffée). Le milieu chauffé peut être de l'eau sous forme d'eau chaude et/ou de vapeur, ou de l'air chaud.
PCT/NL1995/000057 1994-02-14 1995-02-10 Procede et dispositif de nettoyage d'un sol pollue Ceased WO1995021709A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU15918/95A AU1591895A (en) 1994-02-14 1995-02-10 Method and device for cleaning polluted soil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9400226A NL9400226A (nl) 1994-02-14 1994-02-14 Werkwijze en inrichting voor het reinigen van vervuilde grond.
NL9400226 1994-02-14

Publications (1)

Publication Number Publication Date
WO1995021709A1 true WO1995021709A1 (fr) 1995-08-17

Family

ID=19863834

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1995/000057 Ceased WO1995021709A1 (fr) 1994-02-14 1995-02-10 Procede et dispositif de nettoyage d'un sol pollue

Country Status (3)

Country Link
AU (1) AU1591895A (fr)
NL (1) NL9400226A (fr)
WO (1) WO1995021709A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997045212A1 (fr) * 1996-05-24 1997-12-04 Firma Dr. Ralf Schenke Procede et dispositif pour l'assainissement des sols
CN102451830A (zh) * 2010-10-18 2012-05-16 中国科学技术大学苏州研究院 利用人工湿地修复多环芳烃污染土壤的方法
CN108655168A (zh) * 2018-04-13 2018-10-16 江苏大学 g-C3N4/Fe3O4复合材料在修复多环芳烃污染土壤中的用途

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0059020A1 (fr) * 1981-02-23 1982-09-01 Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO Procédé pour retirer du sol des éléments indésirables
GB2098644A (en) * 1981-05-18 1982-11-24 Shell Int Research Method of cleaning polluted subsoil and apparatus for carrying out the method
EP0070593A1 (fr) * 1981-07-10 1983-01-26 Dirk Jan Blonk Procédé de purification du sol par l'introduction d'un agent chauffant ainsi que cloche à vide et appareil utilisable dans ce procédé
US4606774A (en) * 1984-07-30 1986-08-19 The Dow Chemical Company Process for removing contaminants from soils
DE3610199A1 (de) * 1986-03-26 1987-10-01 Wessling Erwin Chem Lab Verfahren zur reinigung von mit schadstoffen verunreinigten boeden
EP0323649A2 (fr) * 1988-01-05 1989-07-12 As Phonix Contractors Procédé et installation pour la décontamination de matières
EP0327896A2 (fr) * 1988-02-06 1989-08-16 LEONHARD WEISS GmbH & Co. Procédé de nettoyage de terres ou analogues, contaminées par des polluants organiques extractibles

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0059020A1 (fr) * 1981-02-23 1982-09-01 Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO Procédé pour retirer du sol des éléments indésirables
GB2098644A (en) * 1981-05-18 1982-11-24 Shell Int Research Method of cleaning polluted subsoil and apparatus for carrying out the method
EP0070593A1 (fr) * 1981-07-10 1983-01-26 Dirk Jan Blonk Procédé de purification du sol par l'introduction d'un agent chauffant ainsi que cloche à vide et appareil utilisable dans ce procédé
US4606774A (en) * 1984-07-30 1986-08-19 The Dow Chemical Company Process for removing contaminants from soils
DE3610199A1 (de) * 1986-03-26 1987-10-01 Wessling Erwin Chem Lab Verfahren zur reinigung von mit schadstoffen verunreinigten boeden
EP0323649A2 (fr) * 1988-01-05 1989-07-12 As Phonix Contractors Procédé et installation pour la décontamination de matières
EP0327896A2 (fr) * 1988-02-06 1989-08-16 LEONHARD WEISS GmbH & Co. Procédé de nettoyage de terres ou analogues, contaminées par des polluants organiques extractibles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997045212A1 (fr) * 1996-05-24 1997-12-04 Firma Dr. Ralf Schenke Procede et dispositif pour l'assainissement des sols
CN102451830A (zh) * 2010-10-18 2012-05-16 中国科学技术大学苏州研究院 利用人工湿地修复多环芳烃污染土壤的方法
CN102451830B (zh) * 2010-10-18 2013-01-16 中国科学技术大学苏州研究院 利用人工湿地修复多环芳烃污染土壤的方法
CN108655168A (zh) * 2018-04-13 2018-10-16 江苏大学 g-C3N4/Fe3O4复合材料在修复多环芳烃污染土壤中的用途

Also Published As

Publication number Publication date
NL9400226A (nl) 1995-09-01
AU1591895A (en) 1995-08-29

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