title: Low temperature thermal degradation of PCDD/Fs in soil using nanosized particles of zerovalent iron and CaO.
abstract: This study investigated the degradation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in contaminated soil using low temperature treatment (200-280°C) both alone and in combination with nanosized zerovalent iron (nZVI) particles or CaO. Control soil samples and soil fortified with nZVI particles or CaO were treated at 200 and 250°C in sealed glass ampoules. Treatment of the ampouled samples at 250°C was more effective than treatment at 200°C and the reduction in PCDD/F concentration was greatest when soil was treated at 250°C with nZVI addition (indeed, treatment at 200°C in the absence of nZVI resulted in increases in total PCDD and PCDD/F concentrations). In larger-scale experiments based on the obtained results, using a rotary furnace, the greatest reduction in total PCDD/F concentration was achieved by treating soil at 280°C, and adding nZVI to the soil resulted in almost no detectable PCDD/F in the gas phase.
authors.affiliation: Department of Chemical Engineering, University of Alicante, Alicante, Spain. lisa.lundin@chem.umu.se
authors.forename: Lisa
authors.initials: L
authors.lastname: Lundin
authors.forename: Julia
authors.initials: J
authors.lastname: Moltó
authors.forename: Andres
authors.initials: A
authors.lastname: Fullana
mesh_terms: D001572:Benzofurans / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D000072338:Dibenzofurans, Polychlorinated; D007501:Iron / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000737:chemistry; D012399:Rotation; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry; D013696:Temperature
chemical_list: D001572:Benzofurans; D017610:Calcium Compounds; D000072338:Dibenzofurans, Polychlorinated; D010087:Oxides; D000072317:Polychlorinated Dibenzodioxins; D012987:Soil; D012989:Soil Pollutants; C016538:lime; D007501:Iron