Advanced oxidation process for ex-situ groundwater remediation
AssigneeEvoqua Water Technologies LLC
InventorsJonathan H Wood, Sevang Doung
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Abstract
Methods of treating contaminated groundwater having recalcitrant organic contaminants are disclosed. The methods include pretreating the contaminated groundwater to remove iron, introducing a persulfate to the contaminated groundwater, and exposing the contaminated groundwater to irradiation. The methods may also include extracting the contaminated groundwater from a feed stream. The methods may also include preparing the persulfate with high purity water. Systems for treating contaminated groundwater having recalcitrant organic contaminants are also disclosed. The systems include a pretreatment subsystem, a source of persulfate, and an irradiation source.
Claims20
A system for treating contaminated groundwater, comprising:
- a pretreatment subsystem capable of removing iron from an aqueous solution;
- a source of persulfate fluidly connectable to a source of contaminated groundwater having an initial concentration of a recalcitrant organic contaminant, the source of persulfate fluidly connected downstream from the pretreatment subsystem and configured to introduce the persulfate to the contaminated groundwater and produce a first treated aqueous solution;
- and
- an irradiation source fluidly connected downstream from the source of persulfate, the irradiation source configured to irradiate the first treated aqueous solution and produce a second treated aqueous solution having a concentration of the recalcitrant organic contaminant lower than the initial concentration of the recalcitrant organic contaminant.
A method of treating contaminated groundwater having an initial concentration of a recalcitrant organic contaminant and an initial concentration of iron, comprising:
- pretreating the contaminated groundwater to produce a pretreated groundwater having a concentration of iron less than the initial concentration of iron;
- introducing a persulfate to the pretreated groundwater to produce a first treated aqueous solution;
- and
- exposing the first treated aqueous solution to irradiation to produce a second treated aqueous solution having a concentration of the recalcitrant organic contaminant that is at least 50% less than the initial concentration of recalcitrant organic contaminant,
- wherein the concentration of recalcitrant organic contaminant in the second treated aqueous solution is at least 99% less than the initial concentration of contaminant, and
- wherein the recalcitrant organic contaminant is 1,4-dioxane and the concentration of the recalcitrant organic contaminant in the second treated aqueous solution is 1 ppb or less.
Dependencies are inferred from the claim text.