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Title: Metal speciation in landfill leachates with a focus on the influence of organic matter

Abstract

Highlights: > This study characterises the heavy-metal content in leachates collected from eight landfills in France. > Most of the metals are concentrated in the <30 kDa fraction, while Pb, Cu and Cd are associated with larger particles. > Metal complexation with OM is not sufficient to explain apparent supersaturation of metals with sulphide minerals. - Abstract: This study characterises the heavy-metal content in leachates collected from eight landfills in France. In order to identify heavy metal occurrence in the different size fractions of leachates, a cascade filtration protocol was applied directly in the field, under a nitrogen gas atmosphere to avoid metal oxidation. The results of analyses performed on the leachates suggest that most of the metals are concentrated in the <30 kDa fraction, while lead, copper and cadmium show an association with larger particles. Initial speciation calculations, without considering metal association with organic matter, suggest that leachate concentrations in lead, copper, nickel and zinc are super-saturated with respect to sulphur phases. Speciation calculations that account for metal complexation with organic matter, considered as fulvic acids based on C1(s) NEXAFS spectroscopy, show that this mechanism is not sufficient to explain such deviation from equilibrium conditions. It is therefore hypothesizedmore » that the deviation results also from the influence of biological activity on the kinetics of mineral phase precipitation and dissolution, thus providing a dynamic system. The results of chemical analyses of sampled fluids are compared with speciation calculations and some implications for the assessment of metal mobility and natural attenuation in a context of landfill risk assessment are discussed.« less

Authors:
 [1]; ; ;  [1];  [2];  [3]; ;  [1]
  1. BRGM, 3 avenue C. Guillemin, BP 6009, 45060 Orleans (France)
  2. Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, 76021 Karlsruhe (Germany)
  3. (Germany)
Publication Date:
OSTI Identifier:
21578478
Resource Type:
Journal Article
Journal Name:
Waste Management
Additional Journal Information:
Journal Volume: 31; Journal Issue: 9-10; Other Information: DOI: 10.1016/j.wasman.2011.05.014; PII: S0956-053X(11)00256-X; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0956-053X
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; ABSORPTION SPECTROSCOPY; CADMIUM; CHEMICAL ANALYSIS; COPPER; DISSOLUTION; FILTRATION; FULVIC ACIDS; HEAVY METALS; LEACHATES; LEAD; NICKEL; NITROGEN; ORGANIC MATTER; PRECIPITATION; REACTION KINETICS; SANITARY LANDFILLS; SULFIDES; SULFUR; X-RAY SPECTROSCOPY; ZINC; CHALCOGENIDES; DISPERSIONS; ELEMENTS; HOMOGENEOUS MIXTURES; KINETICS; MANAGEMENT; MATTER; METALS; MIXTURES; NONMETALS; ORGANIC ACIDS; ORGANIC COMPOUNDS; SEPARATION PROCESSES; SOLUTIONS; SPECTROSCOPY; SULFUR COMPOUNDS; TRANSITION ELEMENTS; WASTE DISPOSAL; WASTE MANAGEMENT

Citation Formats

Claret, Francis, E-mail: f.claret@brgm.fr, Tournassat, Christophe, Crouzet, Catherine, Gaucher, Eric C., Schaefer, Thorsten, Freie Universitaet Berlin, Institute of Geological Sciences, Department of Earth Sciences, Hydrogeology Group, D-12249 Berlin, Braibant, Gilles, and Guyonnet, Dominique. Metal speciation in landfill leachates with a focus on the influence of organic matter. United States: N. p., 2011. Web. doi:10.1016/j.wasman.2011.05.014.
Claret, Francis, E-mail: f.claret@brgm.fr, Tournassat, Christophe, Crouzet, Catherine, Gaucher, Eric C., Schaefer, Thorsten, Freie Universitaet Berlin, Institute of Geological Sciences, Department of Earth Sciences, Hydrogeology Group, D-12249 Berlin, Braibant, Gilles, & Guyonnet, Dominique. Metal speciation in landfill leachates with a focus on the influence of organic matter. United States. doi:10.1016/j.wasman.2011.05.014.
Claret, Francis, E-mail: f.claret@brgm.fr, Tournassat, Christophe, Crouzet, Catherine, Gaucher, Eric C., Schaefer, Thorsten, Freie Universitaet Berlin, Institute of Geological Sciences, Department of Earth Sciences, Hydrogeology Group, D-12249 Berlin, Braibant, Gilles, and Guyonnet, Dominique. Thu . "Metal speciation in landfill leachates with a focus on the influence of organic matter". United States. doi:10.1016/j.wasman.2011.05.014.
@article{osti_21578478,
title = {Metal speciation in landfill leachates with a focus on the influence of organic matter},
author = {Claret, Francis, E-mail: f.claret@brgm.fr and Tournassat, Christophe and Crouzet, Catherine and Gaucher, Eric C. and Schaefer, Thorsten and Freie Universitaet Berlin, Institute of Geological Sciences, Department of Earth Sciences, Hydrogeology Group, D-12249 Berlin and Braibant, Gilles and Guyonnet, Dominique},
abstractNote = {Highlights: > This study characterises the heavy-metal content in leachates collected from eight landfills in France. > Most of the metals are concentrated in the <30 kDa fraction, while Pb, Cu and Cd are associated with larger particles. > Metal complexation with OM is not sufficient to explain apparent supersaturation of metals with sulphide minerals. - Abstract: This study characterises the heavy-metal content in leachates collected from eight landfills in France. In order to identify heavy metal occurrence in the different size fractions of leachates, a cascade filtration protocol was applied directly in the field, under a nitrogen gas atmosphere to avoid metal oxidation. The results of analyses performed on the leachates suggest that most of the metals are concentrated in the <30 kDa fraction, while lead, copper and cadmium show an association with larger particles. Initial speciation calculations, without considering metal association with organic matter, suggest that leachate concentrations in lead, copper, nickel and zinc are super-saturated with respect to sulphur phases. Speciation calculations that account for metal complexation with organic matter, considered as fulvic acids based on C1(s) NEXAFS spectroscopy, show that this mechanism is not sufficient to explain such deviation from equilibrium conditions. It is therefore hypothesized that the deviation results also from the influence of biological activity on the kinetics of mineral phase precipitation and dissolution, thus providing a dynamic system. The results of chemical analyses of sampled fluids are compared with speciation calculations and some implications for the assessment of metal mobility and natural attenuation in a context of landfill risk assessment are discussed.},
doi = {10.1016/j.wasman.2011.05.014},
journal = {Waste Management},
issn = {0956-053X},
number = 9-10,
volume = 31,
place = {United States},
year = {2011},
month = {9}
}