Beyond the material grave: Life Cycle Impact Assessment of leaching from secondary materials in road and earth constructions.

In industrialized countries, large amounts of mineral wastes are produced. They are re-used in various ways, particularly in road and earth constructions, substituting primary resources such as gravel. However, they may also contain pollutants, such as heavy metals, which may be leached to the groundwater. The toxic impacts of these emissions are so far often neglected within Life Cycle Assessments (LCA) of products or waste treatment services and thus, potentially large environmental impacts are currently missed. This study aims at closing this gap by assessing the ecotoxic impacts of heavy metal leaching from industrial mineral wastes in road and earth constructions. The flows of metals such as Sb, As, Pb, Cd, Cr, Cu, Mo, Ni, V and Zn originating from three typical constructions to the environment are quantified, their fate in the environment is assessed and potential ecotoxic effects evaluated. For our reference country, Germany, the industrial wastes that are applied as Granular Secondary Construction Material (GSCM) carry more than 45,000 t of diverse heavy metals per year. Depending on the material quality and construction type applied, up to 150 t of heavy metals may leach to the environment within the first 100 years after construction. Heavy metal retardation in subsoil can potentially reduce the fate to groundwater by up to 100%. One major challenge of integrating leaching from constructions into macro-scale LCA frameworks is the high variability in micro-scale technical and geographical factors, such as material qualities, construction types and soil types. In our work, we consider a broad range of parameter values in the modeling of leaching and fate. This allows distinguishing between the impacts of various road constructions, as well as sites with different soil properties. The findings of this study promote the quantitative consideration of environmental impacts of long-term leaching in Life Cycle Assessment, complementing site-specific risk assessment, for the design of waste management strategies, particularly in the construction sector.

[1]  P. Grathwohl,et al.  Comparison of percolation to batch and sequential leaching tests: theory and data. , 2009, Waste management.

[2]  Enric Vázquez,et al.  Overview Regarding Construction and Demolition Waste in Several Countries , 2013 .

[3]  S. Bauer,et al.  Modellbasierte Sickerwasserprognose für die Verwertung von Recycling-Baustoff in technischen Bauwerken , 2007 .

[4]  Henrik Wenzel,et al.  Environmental assessment of products volume 1: Methodology, tools, and case studies in product , 1997 .

[5]  Markus Delay,et al.  Comparison of leaching tests to determine and quantify the release of inorganic contaminants in demolition waste. , 2007, Waste management.

[6]  Harpa Birgisdottir.  Life cycle assessment model for road construction and use of residues from waste incineration , 2005 .

[7]  Vasilis Fthenakis,et al.  Life cycle inventory analysis of the production of metals used in photovoltaics , 2009 .

[8]  M. Huijbregts,et al.  Priority assessment of toxic substances in life cycle assessment. Part I: calculation of toxicity potentials for 181 substances with the nested multi-media fate, exposure and effects model USES-LCA. , 2000, Chemosphere.

[9]  Mats Eklund,et al.  Environmental evaluation of reuse of by-products as road construction materials in Sweden. , 2003, Waste management.

[10]  S. Hellweg,et al.  Life cycle human toxicity assessment of pesticides: comparing fruit and vegetable diets in Switzerland and the United States. , 2009, Chemosphere.

[11]  Hwong-Wen Ma,et al.  The potential of recycling and reusing municipal solid waste incinerator ash in Taiwan. , 2006, Waste management.

[12]  Defne Apul,et al.  Probabilistic modeling of one-dimensional water movement and leaching from highway embankments containing secondary materials , 2005 .

[13]  Mark A. J. Huijbregts,et al.  USEtox—the UNEP-SETAC toxicity model: recommended characterisation factors for human toxicity and freshwater ecotoxicity in life cycle impact assessment , 2008 .

[14]  Anne Lohrli.  Chapman and Hall , 1985 .

[15]  M. Hauschild,et al.  Environmental assessment of products , 1997 .

[16]  Jiri Hyks.  Leaching from municipal solid waste incineration residues , 2008 .

[17]  Michael Hauschild,et al.  Gone…but not away—addressing the problem of long-term impacts from landfills in LCA , 2008 .

[18]  Shyam R. Asolekar,et al.  Solid wastes generation in India and their recycling potential in building materials , 2007 .

[19]  Margareta Wahlström,et al.  By-products and recycled materials in earth construction in Finland—an assessment of applicability , 2002 .

[20]  K. Hungerbühler,et al.  Time-dependent life-cycle assessment of slag landfills with the help of scenario analysis: the example of Cd and Cu , 2005 .

[21]  Olivier Jolliet,et al.  Building a model based on scientific consensus for Life Cycle Impact Assessment of chemicals: the search for harmony and parsimony. , 2008, Environmental science & technology.

[22]  Defne Apul,et al.  A life cycle based environmental impacts assessment of construction materials used in road construction , 2010 .

[23]  P. Christensen,et al.  Eco-toxicological impact of “metals” on the aquatic and terrestrial ecosystem: A comparison between eight different methodologies for Life Cycle Impact Assessment (LCIA) , 2011 .

[24]  Michael Zwicky Hauschild,et al.  EASEWASTE—life cycle modeling capabilities for waste management technologies , 2010 .

[25]  F. Scheffer,et al.  Lehrbuch der Bodenkunde , 1971, Anzeiger für Schädlingskunde und Pflanzenschutz.

[26]  T B Edil,et al.  Life cycle based risk assessment of recycled materials in roadway construction. , 2007, Waste management.

[27]  R. T. Eikelboom,et al.  The building materials decree: an example of a dutch regulation based on the potential impact of materials on the environment , 2000 .

[28]  Jutta Laine-Ylijoki,et al.  LIFE-CYCLE IMPACTS OF THE USE OF INDUSTRIAL BY-PRODUCTS IN ROAD AND EARTH CONSTRUCTION , 2000 .

[29]  T. Norgate,et al.  Assessing the environmental impact of metal production processes , 2007 .

[30]  Edgar G. Hertwich,et al.  Critical Review: Life-Cycle Inventory Procedures for Long-Term Release of Metals , 2008 .

[31]  Thumrongrut Mungcharoen,et al.  Analysis of steel production in Thailand: Environmental impacts and solutions , 2010 .

[32]  R. Comans,et al.  A consistent geochemical modelling approach for the leaching and reactive transport of major and trace elements in MSWI bottom ash , 2008 .

[33]  M. Huijbregts,et al.  New method for calculating comparative toxicity potential of cationic metals in freshwater: application to copper, nickel, and zinc. , 2010, Environmental science & technology.

[34]  Erik Kärrman,et al.  Environmental systems analysis of the use of bottom ash from incineration of municipal waste for road construction , 2006 .

[35]  Bernd Susset,et al.  Leaching standards for mineral recycling materials--a harmonized regulatory concept for the upcoming German Recycling Decree. , 2011, Waste management.

[36]  M. Hauschild,et al.  Life cycle assessment of disposal of residues from municipal solid waste incineration: recycling of bottom ash in road construction or landfilling in Denmark evaluated in the ROAD-RES model. , 2007, Waste management.

[37]  S. Hellweg,et al.  An LCA model for waste incineration enhanced with new technologies for metal recovery and application to the case of Switzerland. , 2014, Waste management.

[38]  S. Bauer,et al.  Model based prognosis of contaminant leaching for reuse of demolition waste in construction projects , 2007 .

[39]  David S. Kosson,et al.  An Integrated Framework for Evaluating Leaching in Waste Management and Utilization of Secondary Materials , 2002 .

[40]  H. Gäbler,et al.  Quantification of vanadium adsorption by German soils , 2009 .

[41]  Gerhard Lange,et al.  Geophysics / Geodesy: Handbuch zur Erkundung des Untergrundes von Deponien und Altlasten , 1999 .

[42]  Peter Bayer,et al.  Life cycle assessment of active and passive groundwater remediation technologies. , 2006, Journal of contaminant hydrology.

[43]  Hans-Jürgen Dr. Klüppel,et al.  The Revision of ISO Standards 14040-3 - ISO 14040: Environmental management – Life cycle assessment – Principles and framework - ISO 14044: Environmental management – Life cycle assessment – Requirements and guidelines , 2005 .

[44]  H. Rügner,et al.  Model-based prediction of long-term leaching of contaminants from secondary materials in road constructions and noise protection dams. , 2009, Waste management.

[45]  K. Hungerbühler,et al.  Site-dependent fate assessment in LCA: Transport of heavy metals in soil , 2005 .