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Two strategies for PCB soil remediation: Biodegradation and surfactant extraction
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1989
Year
EngineeringSoil ModificationGroundwater RemediationBiodegradationEnvironmental ChemistrySurfactant ExtractionSoil PollutionBioremediationEnvironmental MicrobiologySoil RestorationSoil BioremediationSurfactant SolutionSoil ContaminationEcotoxicologyWaste ManagementOriginal Soil MassEnvironmental EngineeringEnvironmental RemediationPcb‐contaminated SoilsSoil RemediationMicrobiologyMicrobiological Degradation
Abstract Two strategies for the cleanup of PCB‐contaminated soils are being developed: biodegradation by selected bacteria and extraction with aqueous surfactant solutions. Extensive biodegradation has been demonstrated by Pseudomonas putida strain LB400 in studies with Aroclor‐spiked laboratory soil and soil from a New York State site containing 525 ppm of transformed Aroclor 1242 (depleted of di‐ and trichlorobiphenyls). Solutions of sodium dodecylbenzenesulfonate can extract PCB from soils. A bench‐scale process with four countercurrent stages effected the cleanup of a heavy clayey soil. The PCB was recovered from the surfactant solution by precipitation with calcium chloride, reducing the mass of contaminated material to 3% of the original soil mass.