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- W2027845547 abstract "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, the aim was to apply such a methodology in order to identify and quantify effective release rates of heavy metals from granular wastes. Column experiments were conducted with demolition waste and municipal waste incineration (MSWI) bottom ash using different flow velocities and multiple flow interruptions. The effluent was analyzed for heavy metals, DOC, electrical conductivity and pH. The breakthrough-curves were inversely modeled with a numerical code based on the advection–dispersion equation with first order mass-transfer and nonlinear interaction terms. Chromium, Copper, Nickel and Arsenic are usually released under non-equilibrium conditions. DOC might play a role as carrier for those trace metals. By inverse simulations, generally good model fits are derived. Although some parameters are correlated and some model deficiencies can be revealed, we are able to deduce physically reasonable release-mass-transfer time scales. Applying forward simulations, the parameter space with equifinal parameter sets was delineated. The results demonstrate that the presented experimental design is capable of identifying and quantifying non-equilibrium conditions. They show also that the possibility of rate limited release must not be neglected in release and transport studies involving inorganic contaminants." @default.
- W2027845547 created "2016-06-24" @default.
- W2027845547 creator A5080258206 @default.
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- W2027845547 date "2008-10-01" @default.
- W2027845547 modified "2023-10-01" @default.
- W2027845547 title "Effective rates of heavy metal release from alkaline wastes — Quantified by column outflow experiments and inverse simulations" @default.
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- W2027845547 doi "https://doi.org/10.1016/j.jconhyd.2008.07.005" @default.
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