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Liquid Purification

Gas-gas-water-treatment-for-groundwater-and-soil-remediation

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Gas-gas-water treatment for groundwater and soil remediation

Details

Inventors: Kerfoot, William B.;
Assignee:
Primary Examiner: Barry; Chester T.
Assistant Examiner: Prince; Fred
Attorney, Agent or Firm: Fish & Richardson P.C.

A sparging system and process for in-situ removal of contaminants from soil and an associated subsurface groundwater aquifer of a site is disclosed. The sparge system is capable of extracting contaminant in the form of gas from groundwater in a gas/gas/water reaction. The system includes at least one microporous diffuser having a porosity matched to a soil porosity. The microdiffuser is in an injection well. Ozone or other oxidizing gas in the form of bubbles is injected into the site to extract volatile dissolved contaminants for in-situ decomposition. A pump and a pneumatic packer are disposed to alternate pumping and bubble injection into the well to maximize dispersal of bubbles within and outward from the well casing, and to provide uniform dispersion of the bubbles as they travel through the site formation.

DETAILED DESCRIPTION The present invention relates to injection of oxidizing gas in the form of microfine bubbles into aquifer regions by means of a sparging system which includes one or more injection wells to encourage in-situ remediation of subsurface leachate plumes by means of a gas-gas-water reaction.
The present invention is directed to sparging systems and methods of in-situ groundwater remediation in combination with co-reactant substrate materials acting as a catalyst to encourage biodegradation of leachate plumes for removal of dissolved chlorinated hydrocarbons and dissolved hydrocarbon petroleum products.
Remediation of saturated soils may also be obtained by employment of the present invention.
In particular the present invention employs sparging apparatus including microporous bubble generators for generating micron sized duo-gas bubbles into aquifer regions by means of one or more vertically arranged injection wells having a bubble chamber for regulating the size of bubbles.
The sparging system of the present invention encourages biodegradation of leachate plumes which contain biodegradable organics or Criegee decomposition of leachate plumes containing dissolved chlorinated hydrocarbons.
The following systems and methods for removing contaminants from soil and an associated subsurface groundwater aquifer using microporous diffusers and duo-gas systems are particularly useful in that they promote extremely efficient removal of poorly biodegradable organics, particularly dissolved chlorinated solvents, without vacuum extraction, and wherein remediation occurs by destroying organic and hydrocarbon material in place without release of contaminating vapors.
In the present invention the groundwater and soil remediation system comprises oxidizing gas encapsulated in microbubbles generated from microporous diffusers matched to soil porosity.
A unique bubble size range is matched to underground formation porosity and achieves dual properties of fluid like transmission and rapid extraction of selected volatile gases, said size being so selected so as to not to be so small as to lose vertical mobility

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