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US 5,398,756 AGranted
In-situ remediation of contaminated soils
AssigneeMonsanto Company
InventorsPhilip H. Brodsky, Sa V. Ho
Life of this patent
Estimating the term…
Abstract
A process for the in-situ remediation of contaminated soil comprising: (a) forming at least one liquid permeable region within a contaminated soil region, (b) introducing material for treating contaminants in the contaminated soil region into the liquid permeable regions to form at least one treating zone within the contaminated soil region, and (c) transmitting direct electric current through the contaminated soil region between a first electrode and a second electrode having opposite charge, wherein the first electrode is located at a first end of the contaminated soil region and the second electrode is located at the opposite end of the contaminated soil region to cause an electroosmotic flow from the second to the first electrode.
Claims41
A process for the in-situ remediation of soil comprising:
- (a) forming at least one liquid permeable region within a contaminated soil region,
- (b) introducing material for treating contaminants in said contaminated soil region selected from the group consisting of microorganisms, nutrients, electron acceptors, catalysts, adsorbents, surfactants, electron donors, co-metabolites, chelating agents, ion exchange resins, buffers, salts and combinations thereof, into said liquid permeable regions to form at least one treating zone within said contaminated soil region, and
- (c) transmitting direct electric current through said contaminated soil region between a first electrode and a second electrode having opposite charge, wherein said first electrode is located at a first end of said contaminated soil region and said second electrode is located at the opposite end of said contaminated soil region (1) to cause an electroosmotic flow from said second electrode to said first electrode, (2) to cause an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge, or (3) to cause an electroosmotic flow from said second electrode to said first electrode and an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge.
A process for the in-situ remediation of soil comprising:
- (a) forming at least one liquid permeable region within a contaminated soil region,
- (b) introducing material for treating contaminants in said contaminated soil region selected from the group consisting of microorganisms, nutrients, electron acceptors, catalysts, adsorbents, surfactants, electron donors, co-metabolites, chelating agents, ion exchange resins, buffers, salts and combinations thereof, into said liquid .permeable regions to form at least one treating zone within said contaminated soil region,
- (c) transmitting direct electric current through said contaminated soil region between a first electrode and a second electrode having opposite charge, wherein said first electrode is located at a first end of said contaminated soil region and said second electrode is located at the opposite end of said contaminated soil region (1) to cause an electroosmotic flow from said second electrode to said first electrode, (2) to cause an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge, or (3) to cause an electroosmotic flow from said second electrode to said first electrode and an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge, and
- (d) periodically reversing the polarity of said first and second electrodes to reverse the direction of movement of said contaminants through said treating zones.
1 more element
A process for the in-situ remediation of soil comprising:
- (a) forming at least one liquid permeable region within a contaminated soil region,
- (b) introducing material for treating contaminants in said contaminated soil region selected from the group consisting of microorganisms, nutrients, electron acceptors, catalysts, adsorbents, surfactants, electron donors, co-metabolites, chelating agents, ion exchange resins, buffers, salts and combinations thereof, into said liquid permeable regions to form at least one treating zone within said contaminated soil region,
- (c) transmitting direct electric current through said contaminated soil region between a first electrode and a second electrode having opposite charge, wherein said first electrode is located at a first end of said contaminated soil region and said second electrode is located at the opposite end of said contaminated soil region (1) to cause an electroosmotic flow from said second electrode to said first electrode, (2) to cause an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge, or (3) to cause an electroosmotic flow from said second electrode to said first electrode and an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge,
- (d) supplying a first liquid which comprises water to said contaminated soil region, wherein said direct electric current causes said first liquid to flow by electroosmosis in a direction from said second electrode to said first electrode, and
- (e) (1) periodically reversing the polarity of said first and second electrodes to reverse the direction of movement of said contaminants through said treating zones, (2) recycling the water from said electroosmotic flow from said first electrode to said second electrode, or (3) periodically reversing the polarity of said first and second electrodes to reverse the direction of movement of said contaminants through said treating zones and recycling the water from said electroosmotic flow in the direction opposite said electroosmotic flow.
2 more elements
A process for the in-situ remediation of soil comprising:
- (a) introducing material for treating contaminants in a contaminated soil region selected from the group consisting of microorganisms, nutrients, electron acceptors, catalysts, adsorbents, surfactants, electron donors, co-metabolites, chelating agents, ion exchange resins, buffers, salts and combinations thereof, into at least one existing liquid permeable region within said contaminated soil region to form at least one treating zone within said contaminated soil region, and
- (b) transmitting direct electric current through said contaminated soil region between a first electrode and a second electrode having opposite charge, wherein said first electrode is located at a first end of said contaminated soil region and said second electrode is located at the opposite end of said contaminated soil region (1) to cause an electroosmotic flow from said second electrode to said first electrode, (2) to cause an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge, or (3) to cause an electroosmotic flow from said second electrode to said first electrode and an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge.
A process for the in-situ remediation of soil comprising:
- (a) introducing material for treating contaminants in a contaminated soil region selected from the group consisting of microorganisms, nutrients, electron acceptors, catalysts, adsorbents, surfactants, electron donors, co-metabolites, chelating agents, ion exchange resins, buffers, salts and combinations thereof, into at least one existing liquid permeable region within said contaminated soil region to form at least one treating zone within said contaminated soil region,
- (b) transmitting direct electric current through said contaminated soil region between a first electrode and a second electrode having opposite charge, wherein said first electrode is located at a first end of said contaminated soil region and said second electrode is located at the opposite end of said contaminated soil region (1) to cause an electroosmotic flow from said second electrode to said first electrode, (2) to cause an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge, or (3) to cause an electroosmotic flow from said second electrode to said first electrode and an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge, and
- (c) periodically reversing the polarity of said first and second electrodes to reverse the direction of movement of said contaminants through said treating zones.
A process for the in-situ remediation of soil comprising:
- (a) introducing material for treating contaminants, in a contaminated soil region selected from the group consisting of microorganisms, nutrients, electron acceptors, catalysts, adsorbents, surfactants, electron donors, co-metabolites, chelating agents, ion exchange resins, buffers, salts and combinations thereof, into at least one existing liquid permeable region within said contaminated soil region to form at least one treating zone within said contaminated soil region,
- (b) transmitting direct electric current through said contaminated soil region between a first electrode and a second electrode having opposite charge, wherein said first electrode is located at a first end of said contaminated soil region and said second electrode is located at the opposite end of said contaminated soil region (1) to cause an electroosmotic flow from said second electrode to said first electrode, (2) to cause an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge, or (3) to cause an electroosmotic flow from said second electrode to said first electrode and an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge,
- (c) supplying a first liquid which comprises water to said contaminated soil region, wherein said direct electric current causes said first liquid to flow by electroosmosis in a direction from said second electrode to said first electrode, and
- (d) (1) periodically reversing the polarity of said first and second electrodes to reverse the direction of movement of said contaminants through said treating zones, (2) recycling the water from said electroosmotic flow from said first electrode to said second electrode, or (3) periodically reversing the polarity of said first and second electrodes to reverse the direction of movement of said contaminants through said treating zones and recycling the water from said electroosmotic flow in the direction opposite said electroosmotic flow.
1 more element
A process for the in-situ remediation of soil comprising:
- (a) transmitting direct electric current through said contaminated soil region between a first electrode and a second electrode having opposite charge, wherein said first electrode is located at a first end of said contaminated soil region and said second electrode is located at the opposite end of said contaminated soil region (1) to cause an electroosmotic flow from said second electrode to said first electrode, (2) to cause an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge, or (3) to cause an electroosmotic flow from said second electrode to said first electrode and an electromigratory movement of ionic contaminants in a direction toward the electrode of opposite charge, wherein said contaminated soil region contains at least one existing liquid permeable region and said at least one existing liquid permeable region contains existing treating materials;
- and
- (b) periodically reversing the polarity of said first and second electrodes to reverse the direction of movement of said contaminants through said existing treating zones.
Dependencies are inferred from the claim text.