Superfund Innovative Technology Evaluation (SITE)
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
This report evaluates the Low Temperature Thermal Treatment (LT3®) system's ability to remove volatile organic compounds (VOC) and semivolatile organic compounds (SVOC) from solid wastes. This evaluation is based on treatment performance and cost data from the Superfund Innovative Technology Evaluation (SITE) demonstration and five other case studies.
The LT3® system thermally desorbs organic compounds from contaminated soil without heating the soil to combustion temperatures. The LT3® system is divided into three treatment areas: soil treatment, emissions control, and condensate treatment. End products include treated soil, fabric filter dust, treated condensate, and treated stack gas. The transportable system is comprised of equipment assembled on three flat-bed trailers.
The LT3® system demonstration was conducted under the SITE program at the Anderson Development Company (ADC) site in Adrian, Michigan. During the demonstration, the LT3® system treated lagoon sludge from the site contaminated with VOCs and SVOCs, primarily 4,4'-methylenebis(2-chloroanilme) (MBOCA). During the development of the LT3® system, Weston conducted bench- and pilot-scale tests and collected tractability data for the following wastes: coal tar, drill cuttings (oil-based mud), leaded and unleaded gasoline, No. 2 diesel fuel, JP4 jet fuel, petroleum hydrocarbons, halogenated and nonhalogenated solvents, VOCs, SVOCs, and polynuclear aromatic hydrocarbons (PAH).
Based on the results of the SITE demonstration and other case studies, the following conclusions can be drawn: (1) the LT3® system can process a wide variety of soils with offering moisture and contaminant concentrations; (2) The LT3® system removes VOCs to below detection limits; (3) The LT3® system generally decreases SVOC concentrations, but some SVOC concentrations may increase, most likely due to chemical transformations during heating; (4) under certain conditions, dioxins and furans may be formed during treatment in the LT3® system and may be distributed in process residuals; and (5) remediation costs, including all activities from site preparation through demobilization, may range from $373 to $725 per ton of soil, depending on soil moisture content and regulatory requirements.
The report also discusses the applicability of the LT3® system based on compliance with regulatory requirements, implementability, short-term impact, and long-term effectiveness. In addition, the factors influencing the technology's performance in meeting these criteria are discussed.