CA2511957A1 - Recovery of non-aqueous phase liquids from ground sources - Google Patents

Recovery of non-aqueous phase liquids from ground sources Download PDF

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Publication number
CA2511957A1
CA2511957A1 CA 2511957 CA2511957A CA2511957A1 CA 2511957 A1 CA2511957 A1 CA 2511957A1 CA 2511957 CA2511957 CA 2511957 CA 2511957 A CA2511957 A CA 2511957A CA 2511957 A1 CA2511957 A1 CA 2511957A1
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CA
Canada
Prior art keywords
napl
gas
ground
supersaturated liquid
water region
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.)
Granted
Application number
CA 2511957
Other languages
French (fr)
Other versions
CA2511957C (en
Inventor
Tommy M. W. Li
Marios Ioanniois
Ioannis Chatzis
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Individual
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Individual
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 Individual filed Critical Individual
Priority to CA2511957A priority Critical patent/CA2511957C/en
Publication of CA2511957A1 publication Critical patent/CA2511957A1/en
Application granted granted Critical
Publication of CA2511957C publication Critical patent/CA2511957C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically

Abstract

The invention disclosed relates to a method and apparatus for recovering non-aqueous phase liquids (NAPL) from regions below ground where NAPL spills are sources of aquifer contamination. The apparatus includes a system to supply gas-supersaturated liquid, a system of ground wells in fluid communication with the contaminated ground water region(source of contamination) and with an above-ground NAPL recovery system, said system of wells including an injection well in fluid communication with the system to supply gas-supersaturated liquid and with the contaminated region below ground, an extraction well in fluid communication with the contaminated region below ground and with the NAPL recovery system, wherein the NAPL is in the gaseous phase or gas-mobilized non-volatile liquid phase or both, and a pump for delivering the gas-supersaturated liquid to the vicinity of the contaminated region below ground.

Claims (18)

1. An apparatus for recovering non-aqueous phase liquids (NAPL) from a contaminated ground water region, comprising, a system to supply a gas-supersaturated liquid, a system of wells drilled into the ground such that they are in fluid communication with the contaminated ground water region and with an above-ground NAPL recovery system, said system of wells including an injection well in fluid communication with the system to supply gas-supersaturated liquid and with the contaminated ground water region, an extraction well in fluid communication with the contaminated ground water region and with the NAPL recovery system, and a pump for delivering the gas-supersaturated liquid to the vicinity of the contaminated ground water region.
2. An apparatus according to Claim 1, wherein the injection well comprises a vertical well, which extends into the ground to the vicinity of the contamination source.
3. An apparatus according to Claim 2, wherein the injection well additionally comprises a horizontal or deviated section extending below the contamination source.
4. An apparatus according to Claim 3, wherein the vertical well includes a perforated portion.
5. An apparatus according to Claim 4, wherein the horizontal section includes a perforated portion.
6. An apparatus according to Claim 5, wherein both the vertical and the horizontal sections include injection points to deliver gas supersaturated liquid, while managing degassing prior to the liquid contacting the ground contamination source.
7. A method for recovering non-aqueous phase liquids (NAPL) from a contaminated ground water region comprising, (a) providing a system to supply gas supersaturated liquid, a system of ground wells in fluid communication with the contaminated ground water region and with an above-ground volatiles recovery system, said system of wells including an injection well in fluid communication with the system to supply gas supersaturated liquid and with the contaminated ground water region and an extraction well in fluid communication with the NAPL recovery system, (b) injecting the gas-supersaturated liquid into the vicinity of the contaminated ground-water region through the gas injection well, wherein the NAPL is held in the pores of a porous medium in the contaminated ground-water region, resulting in the flow of the gas-supersaturated liquid to displace the NAPL held in the pores via lifting some of the NAPL by rising gas bubbles towards the surface, and also removing NAPL by evaporation into the growing bubbles, and wherein non-volatile NAPL is also mobilized by the gas, (c) directing the NAPL containing gaseous phase and the NAPL mobilized by gas to the recovery system, and (d) recovering the NAPL.
8. A method according to Claim 7, wherein the gas supersaturated liquid additionally comprises a suitable surfactant.
9. A method according to Claim 7, wherein the surfactant is a polyoxyethylene sorbitant monooleate.
10. A method according to Claim 7, wherein the gas supersaturated liquid is injected below the NAPL contaminated source.
11. A method according to Claim 7, wherein the pressure of the injected supersaturated liquid is higher than the hydrostatic pressure at the point of injection.
12. A method according to Claim 7, wherein the liquid is water
13. A method according to Claim 7, wherein the gas is air, oxygen, CO2 or an alkane.
14. A method according to Claim 7, wherein the NAPL comprises petroleum products or chlorinated solvents.
15. A method according to Claim 7, wherein the NAPL comprises trichloroethylene.
16. A method according to Claim 7, wherein the method is continuous.
17. An apparatus according to Claim 1, wherein the NAPL recovery system comprises a multi-phase system, for recovery of both gaseous phase NAPL and non-volatile free-phase NAPL.
18. A method according to Claim 7, wherein NAPL is recovered in the form of free-phase NAPL and as volatilized NAPL in the gas phase produced
CA2511957A 2005-07-13 2005-07-13 Recovery of non-aqueous phase liquids from ground sources Expired - Fee Related CA2511957C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2511957A CA2511957C (en) 2005-07-13 2005-07-13 Recovery of non-aqueous phase liquids from ground sources

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA2511957A CA2511957C (en) 2005-07-13 2005-07-13 Recovery of non-aqueous phase liquids from ground sources

Publications (2)

Publication Number Publication Date
CA2511957A1 true CA2511957A1 (en) 2007-01-13
CA2511957C CA2511957C (en) 2012-12-04

Family

ID=37625900

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2511957A Expired - Fee Related CA2511957C (en) 2005-07-13 2005-07-13 Recovery of non-aqueous phase liquids from ground sources

Country Status (1)

Country Link
CA (1) CA2511957C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111807492A (en) * 2020-06-05 2020-10-23 上海市政工程设计研究总院（集团）有限公司 NAPL pollution remediation system and method in underground water based on pollution prevention and control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111807492A (en) * 2020-06-05 2020-10-23 上海市政工程设计研究总院（集团）有限公司 NAPL pollution remediation system and method in underground water based on pollution prevention and control
CN111807492B (en) * 2020-06-05 2023-09-29 上海市政工程设计研究总院（集团）有限公司 NAPL pollution restoration system in underground water based on pollution control and restoration method thereof

Also Published As

Publication number Publication date
CA2511957C (en) 2012-12-04

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Effective date: 20160713