title: PAHs in leachates from thermal power plant wastes and ash-based construction materials.
abstract: The focus of the current study is to characterise the leaching behaviour of polycyclic aromatic hydrocarbons (PAHs) from oil shale ashes (OSAs) of pulverised firing (PF) and circulating fluidised-bed (CFB) boilers from Estonian Thermal Power Plant (Estonia) as well as from mortars and concrete based on OSAs. The target substances were 16 PAHs from the EPA priority pollutant list. OSA samples and OSA-based mortars were tested for leaching, according to European standard EN 12457-2 (2002). European standard CEN/TC 15862(2012) for monolithic matter was used for OSA-based concrete. Water extracts were analysed by GC-MS for the concentration of PAHs. Naphthalene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene and pyrene were detected. Still, the release of PAHs was below the threshold limit value for inert waste. The amount of the finest fraction (particle size <0.045 mm), the content of the Al-Si glass phase and the surface characteristics were the main factors, which could affect the accessibility of PAHs for leaching. The mobility of PAHs from OSA of CFB and PF boilers was 20.2 and 9.9%, respectively. Hardening of OSA-based materials did not lead to the immobilisation of soluble PAHs. Release of PAHs from the monolith samples did not exceed 0.5 μg/m(2). In terms of leaching of PAHs, OSA is safe to be used for construction purposes.
authors: National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618, Tallinn, Estonia, natalja.irha@kbfi.ee.
authors: Natalya
authors: N
authors: Irha
authors: Janek
authors: J
authors: Reinik
authors: Jekaterina
authors: J
authors: Jefimova
authors: Arina
authors: A
authors: Koroljova
authors: Lembi-Merike
authors: LM
authors: Raado
authors: Tiina
authors: T
authors: Hain
authors: Mai
authors: M
authors: Uibu
authors: Rein
authors: R
authors: Kuusik
mesh_terms: D003252:Construction Materials / Q000032:analysis*; D004785:Environmental Pollutants / Q000032:analysis*; D004787:Environmental Pollution / Q000032:analysis*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D011210:Power Plants
chemical_list: D004785:Environmental Pollutants; D011084:Polycyclic Aromatic Hydrocarbons