Innovations in ERH Remediation of Emerging Contaminants

The emergence of newly-identified contaminants of concern such as 1,4-dioxane, has resulted in continually changing regulatory criteria as agencies obtain more information regarding chemical properties of the compound. The high solubility and low Henry's Law constant of 1,4-dioxane combine to present complex challenges with respect to its remediation. ERH continues to be evaluated as a potential treatment method for this emerging contaminant through laboratory and field data collected at TRS ERH projects. At ambient conditions, the physical properties of 1,4-dioxane indicate air stripping is not an efficient treatment mechanism. However, a major treatment process for ERH involves steam stripping, the efficiency of which had not been previously investigated for 1,4-dioxane removal.

TRS conducted laboratory testing to identify the properties that influence remediation of 1,4-dioxane using ERH, and the results have been used to further evaluate and optimize treatment where 1,4-dioxane is a contaminant of concern. The TRS ERH steam stripping method was observed to effectively transfer 1,4-dioxane to the vapor phase for subsequent treatment. During field implementation of ERH, TRS achieved greater than 99.8 percent reductions in 1,4-dioxane groundwater concentrations. Process stream monitoring in the field indicated 95 percent of 1,4-dioxane remained in the vapor stream after removal from the subsurface. Furthermore, granular activated carbon has proved to be an effective 1,4-dioxane vapor treatment method.

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Please contact David Fleming at 425-396-4266 / email if you have questions or if you need more information.