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The Next Generation of leaching Tests
Citation:
Thorneloe, S. The Next Generation of leaching Tests. 14th International Waste and Landfill Symposium, Cagliari, ITALY, September 30 - October 04, 2013.
Impact/Purpose:
To present research science on advancement of leaching test methods in the U.S. and Europe.
Description:
Coal ash and other industrial by-products are used in building, construction, engineering and even agricultural applications. Changes in multi-pollutant control technology at coal-fired power plants and other combustion sources are shifting mercury (Hg) and other constituents of potential concern (COPCs) from the stack gas to the fly ash, flue gas desulfurization (FGD) residues and other air pollution control (APC) residues. Historically, single-point pH tests have been used to evaluate the leaching of metals and other COPCs. The overly broad use of such tests has been questioned by the National Academy of Science and encouraged the use of tests that consider a broader range of conditions that can affect leaching and address the environmental conditions that the material is managed. Through a review of existing methods, the Leaching Environmental Assessment Framework (LEAF) was selected for use because it provides an integrated framework for evaluating leaching behavior of materials using a tiered approach that considers pH, liquid to solid ratio (L/S), and waste form across a range of field conditions. The results from the use of LEAF are considered to provide a more accurate source term for use in environmental or risk assessments taking into account potential dilution and attenuation when evaluating impacts to human health and ecosystems.
URLs/Downloads:
ABSTRACT_THORNELOE_NEXT GENERATION OF LEACH TESTS-FINAL(4].DOCXABSTRACT_THORNELOE_NEXT GENERATION OF LEACH TESTS-FINAL(5DGM][1].DOCX