Lasagna™ Process systems

Overall, the Lasagna process has proven to be a very safe method to treat high concentrations of chlorinated solvent. No contaminated material is removed from the site. All materials are emplaced directly into the contaminated soil by the mandrel system, minimizing exposures to the workers. The contamination is degraded below grade and very httle, if any, vapor reaches the site worker or nearby residents during construction and operation. 

Field scale studies and projects were carried out by a consortium of industrial partners (Monsanto, DuPont, and General Electric), the USEPA and the DOE [1]. The electrokinetic process designed and operated for the removal of TCE at Paducah (KY, USA) was called the Lasagna process. It utilizes a DC electric field to move pore water and contaminants uniformly through the soil mass to treatment zones emplaced within the contaminated area. The treatment materials emplaced are typically irtMi, coke, and kaolin. The process results in little or no wastes. The system was operated over a 2-year period when the cleanup target ctmcentration of TCE (5.6 mg/kg) was met. The final results show an average TCE concentration of 0.38 mg/kg. 

Many significant advances achieved in the Lasagna installation process over the last few years have made it a cost-effective solution to source area remediation. The equipment has evolved to the point where emplacements take weeks instead of months and the material costs have been significantly minimized. Installation rates have risen from 9 linear meters (30 ft) per day for the Paducah installation to over 90 m (300 ft) per day for the Wisconsin installation. Both systems are described below. 

Lasagna can be installed at many sites with diverse conditions and surrounding environments. The system works well in saturated or vadose zones. Installations have been installed and operated safely in semirural and urban settings. With the process being contained underground, the only pieces of equipment required are the rectifier and a remote data monitoring system. The only structure required is a... 

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