Superfund Innovative Technology Evaluation (SITE)
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
This report presents performance and economic data from the Superfund Innovative Technology Evaluation Program’s evaluation of Electrochemical Design Associates (EDA) (formerly Geokinetics International, Inc.) lead recovery technology. The demonstration evaluated the technology's ability to remove lead contamination from soil.
The EDA technology was operated by injecting an electrolyte solution into the treatment tank, allowing the solution to migrate vertically and horizontally through the soil. The ethylene diamine tetraacetic acid in the electrolyte solution acted as a chelating agent, forming a soluble Pb-EDTA2- complex. The Pb-EDTA2- complex within the solution was removed from the bottom of the treatment tank through extraction pipes. From here, the solution flowed into the header tank and was fed directly into the proprietary electrolyte solution management system (ESMS).
The ESMS consisted of proprietary electrochemical lead recovery cells. Once the electrolyte solution had passed through the ESMS, it was delivered to a holding tank where it was stored and the pH was adjusted. From here, the electrolyte solution was re-delivered to the treatment tank and the process was repeated. The entire system is a batch closed-loop process, which is initiated and controlled by a single automated process control system (GII 1998b).
This demonstration tested the ability of the EDA technology to remove lead in two phases. Phase I was conducted at Building 394 Battery Shop from August 8 to September 28, 2001, and Phase II was conducted from April 1 to July 22, 2002.
The primary demonstration objective was to determine whether the EDA technology reduced lead concentrations in soil to below the cleanup goal of 2,000 milligrams per kilogram (mg/kg). The EDA technology did reduce lead concentrations in soil, but not below the 2,000 mg/kg cleanup goal for all batches.
Potential sites for applying this technology include Superfund and other hazardous waste sites where soils are contaminated with lead. Economic data indicate that the remediation costs of using this technology are affected by site-specific factors, such as the availability of electrical and water lines. The operating cost for implementing the EDA technology is estimated to be $11,980 per ton for a 5-ton pilot study, and $546 per ton for a 500-ton, full-scale study. Capital costs are not available at this time.