Leaching of hazardous substances from a composite construction product--an experimental and modelling approach for fibre-cement sheets

Autor: Nicoleta Schiopu, Ligia Tiruta-Barna, Maria Lupsea
Přispěvatelé: Laboratoire d'Ingénierie des Systèmes Biologiques et des Procédés (LISBP), Institut National de la Recherche Agronomique (INRA)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Est (UPE), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2013
Předmět:
Preservative
Biocide
Environmental Engineering
[SDV]Life Sciences [q-bio]
Health
Toxicology and Mutagenesis
0211 other engineering and technologies
chemistry.chemical_element
02 engineering and technology
Chemical-transport model
010501 environmental sciences
01 natural sciences
Hazardous Substances
Hazardous waste
[SDV.IDA]Life Sciences [q-bio]/Food engineering
021105 building & construction
Environmental Chemistry
[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering
Leachate
Boron
Waste Management and Disposal
0105 earth and related environmental sciences
Cement
Long-term leaching
Waste management
Environmental assessment
Construction Materials
Leaching tests
Fibre cement
Pollution
6. Clean water
chemistry
Leaching (chemistry)
Models
Chemical
Environmental chemistry
Fibre-cement sheets
Zdroj: Journal of Hazardous Materials
Journal of Hazardous Materials, 2014, 264, pp.236-245. ⟨10.1016/j.jhazmat.2013.11.017⟩
Journal of Hazardous Materials, Elsevier, 2014, 264, pp.236-245. ⟨10.1016/j.jhazmat.2013.11.017⟩
ISSN: 1873-3336
0304-3894
DOI: 10.1016/j.jhazmat.2013.11.017⟩
Popis: International audience; The leaching behaviour of a commercial fibre-cement sheet (FCS) product has been investigated. A static pH dependency test and a dynamic surface leaching test have been performed at lab scale. These tests allowed the development of a chemical-transport model capable to predict the release of major and trace elements over the entire pH range, in function of time. FCS exhibits a cement-type leaching behaviour with respect to the mineral species. Potentially hazardous species are released in significant quantities when compared to their total content. These are mainly heavy metals commonly encountered in cement matrixes and boron (probably added as biocide). Organic compounds considered as global dissolved carbon are released in significant concentrations, originating probably from the partial degradation of the organic fibres. The pesticide terbutryn (probably added during the preservative treatment of the organic fibres) was systematically identified in the leachates. The simulation of an upscaled runoff scenario allowed the evaluation of the cumulative release over long periods and the distribution of the released quantities in time, in function of the local exposure conditions. After 10 years of exposure the release reaches significant fractions of the species' total content - going from 4% for Cu to near 100% for B.
Databáze: OpenAIRE
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