Method for removing undesired components from the soil

• US 4,465,402 A
• Filed: 02/19/1982
• Issued: 08/14/1984
• Est. Priority Date: 02/19/1982
• Status: Expired due to Fees

• Current Assignee: NEDERLANDSE CENTRALE ORGANISATIE VOOR TOEGEPAST NATUURWETENSCHAPPELIJK ONDERZOEK, JULIANA VAN STOLBERGLAAN 148, THE HAGUE, THE NETHERLANDS
• Original Assignee: Nederlandse Centrale Organisatie Voor Toegepast Natuurwetenschappelijk Onderzoek
• Inventors: ter Meulen, Berend P.
• Primary Examiner(s): Suchfield, George A.
• Application Number:
  US06/350,349
• Time in Patent Office: 907 Days
• Field of Search: 166/285, 166/267, 166/305 R, 299/4, 299/5, 405/258, 405/263, 405/264, 405/128, 405/130
• US Class Current: 405/264
• CPC Class Codes: B01D 11/0219 Fixed bed of solid material
• CPC Class Codes: B09C 1/00 Reclamation of contaminated soil

Abstract

A method for removing undesired components from the soil which comprises screening adjacent soil from the contaminated soil having the undesired components therein, supplying an extracting agent, suitable for removing the undesired components, to the soil at a level either above or below the contaminated soil, and removing the extracting agent having the undesired components therein from the soil at a level on the other side of the contaminated soil.

Claims

1. A method for removing undesired components from the soil comprising:

screening adjacent soil from contaminated soil having the undesired components therein,

supplying an extracting agent, suitable for removing the undesired components, to the soil at a level above the contaminated soil,

sucking up the extracted agent having the undesired components therein from the soil at a level below the contaminated soil.

2. A method according to claim 1, wherein the contaminated soil is simultaneously screened from the underlying soil.

3. A method according to claim 1, wherein the vertical screening extends 10-15 m below the ground level.

4. A method according to claim 1, wherein the extracting agent is sprinkled onto the surface of the soil and is sucked off at a level below the lower level of the contaminated soil.

5. A method according to claim 1, wherein the extract is purified by a known method, and the purified extracting agent thus obtained is recirculated.

6. A method according to claim 1, wherein the extracting agent consists of water, water with a decreased pH, water with an increased pH, ethanol, butanol, a mixture of ethanol and water, petroleum ether.

7. A process according to claim 1, wherein either one of the inside and the outside of the screening is lined with a completely covering, inert material.

8. A method according to claim 1, wherein the exterior of the screening wall is provided with a draining system for collecting any water and extracting agent which may ooze through the screening wall.

9. A method according to claim 1, wherein the volume of extracting agent amounts to 100-500 l/m² /day.

10. A method for removing undesired components from the soil comprising,

screening adjacent soil from contaminated soil having the undesired components therein,

injecting an extracting agent, suitable for removing the undesired components, into the soil at a level below the contaminated soil, and

removing the extracting agent having the undesired components therein from the soil at a level above the contaminated soil.

11. A method according to claim 10, wherein the extracting agent is removed from the surface of the soil.