Effective rates of heavy metal release from alkaline wastes — Quantified by column outflow experiments and inverse simulations

作者: Markus Wehrer , Kai Uwe Totsche

DOI: 10.1016/J.JCONHYD.2008.07.005

关键词:

摘要: Column outflow experiments operated at steady state flow conditions do not allow the identification of rate limited release processes. This requires an alternative experimental methodology. In this study, aim was to apply such a methodology in order identify and quantify effective rates heavy metals from granular wastes. were conducted with demolition waste municipal incineration (MSWI) bottom ash using different velocities multiple interruptions. The effluent analyzed for metals, DOC, electrical conductivity pH. breakthrough-curves inversely modeled numerical code based on advection-dispersion equation first mass-transfer nonlinear interaction terms. Chromium, Copper, Nickel Arsenic are usually released under non-equilibrium conditions. DOC might play role as carrier those trace metals. By inverse simulations, generally good model fits derived. Although some parameters correlated deficiencies can be revealed, we able deduce physically reasonable release-mass-transfer time scales. Applying forward parameter space equifinal sets delineated. results demonstrate that presented design is capable identifying quantifying They show also possibility must neglected transport studies involving inorganic contaminants.

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