Soil remediation method and composition
First Claim
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1. A method for determining a subsurface contaminant remediation protocol, comprising:
- collecting a soil sample from the subsurface;
identifying at least one target contaminant for concentration reduction;
choosing a surfactant and optionally choosing a cosolvent for injection into the subsurface to solubilize and/or desorb the at least one target contaminant;
choosing an oxidant and optionally choosing an activator for the oxidant for injection into the subsurface to oxidize the target contaminant; and
choosing the quantity of surfactant for injection into the subsurface to form a Winsor I system or a submicellar surfactant solution or a microemulsion;
injecting the surfactant and the oxidant into the soil sample; and
measuring an initial surfactant concentration in the soil sample and a final surfactant concentration in the soil sample after a period of time,wherein the surfactant resists oxidation by the oxidant, and the surfactant increases oxidation of the at least one target contaminant in the soil sample,wherein the contaminant comprises a nonaqueous phase liquid (NAPL), andwherein at least 40% of the initial mass of the contaminant is destroyed in situ in the sample.
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Abstract
A method for in-situ reduction of contaminants in soil.
179 Citations
22 Claims
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1. A method for determining a subsurface contaminant remediation protocol, comprising:
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collecting a soil sample from the subsurface; identifying at least one target contaminant for concentration reduction; choosing a surfactant and optionally choosing a cosolvent for injection into the subsurface to solubilize and/or desorb the at least one target contaminant; choosing an oxidant and optionally choosing an activator for the oxidant for injection into the subsurface to oxidize the target contaminant; and choosing the quantity of surfactant for injection into the subsurface to form a Winsor I system or a submicellar surfactant solution or a microemulsion; injecting the surfactant and the oxidant into the soil sample; and measuring an initial surfactant concentration in the soil sample and a final surfactant concentration in the soil sample after a period of time, wherein the surfactant resists oxidation by the oxidant, and the surfactant increases oxidation of the at least one target contaminant in the soil sample, wherein the contaminant comprises a nonaqueous phase liquid (NAPL), and wherein at least 40% of the initial mass of the contaminant is destroyed in situ in the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 21)
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13. A method for determining a subsurface contaminant remediation protocol, comprising:
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collecting a soil sample from the subsurface; identifying at least one target contaminant for concentration reduction; choosing a surfactant or surfactants and optionally choosing a solvent for injection into the subsurface to desorb and solubilize the at least one target contaminant; choosing an oxidant and optionally choosing an activator for injection into the subsurface to oxidize the target contaminant; choosing the quantity of surfactant for injection into the subsurface to form a Winsor I system or a microemulsion; determining the spatial concentration distribution of the target contaminant; determining a hydrogeological property of the subsurface; and using the determined spatial concentration distribution of the target contaminant and the hydrogeological property to determine the target depth for the surfactant and oxidant and optionally for the solvent and activator, injecting the surfactant and the oxidant into the soil sample; and measuring an initial surfactant concentration in the soil sample and a final surfactant concentration in the soil sample after a period of time, wherein the surfactant resists oxidation by the oxidant, and the surfactant increases oxidation of the at least one target contaminant in the soil sample, wherein the contaminant comprises a nonaqueous phase liquid (NAPL), and wherein at least 40% of the initial mass of the contaminant is destroyed in situ in the sample. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 22)
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Specification