INTEGRATED IN-SITU SOIL REMEDIATION TECHNOLOGY - THE LASAGNA PROCESS

Contamination in low-permeability soils poses a significant technical challenge to in situ remediation efforts, primarily due to poor access ibility to the contaminants and difficulty in uniform delivery of trea tment reagents. This paper discusses an integrated in situ remedial ap proach in which electrokinetics is coupled with sorption/degradation i n treatment zones that are installed directly in the contaminated soil s. Called Lasagna due to the layered appearance of electrodes and trea tment zones, the technology could conceptually treat organic and inorg anic contamination as well as mixed wastes. Laboratory results obtaine d with p-nitrophenol as a model organic contaminant in kaolinite suppo rt the feasibility of the approach. Key operating characteristics of t he process are discussed.