Assessment of metal mobility in sludges and solid wastes

Hamburg University of Technology
  • 500
  • Among the criteria to assess which element or elemental species, beside its toxic potential, may be of major concern in ecological evaluations, one question deserves primary attention: Is the element mobile in geochemical processes because of either its volatility or its solubility in natural water, so that the effect of geochemical perturbations can propagate through the environment? (...) Problems with solid "speciation" (...) are connected to the complexity of heterogenous systems, e.g. of soils, sediments and aerosol particles, and to disequilibria between dissolved and particulate fractions. It has been stressed, that due to the important role of kinetically controlled processes in these systems, the actual speciation is often different from what can be expected. Particularly in polluted solid systems, an even greater increase of entropy will induce a concominant increase in instability in both physical and chemical context (...) On the other hand, it is just these systems, where action is immediately needed and where for an assessment or prognosis of possible adverse effects the species and the transformations of pollutants have to be evaluated. The present review on metal mobility in relation to "speciation" in typical examples of solid waste materials is a follow-up study to our earlier compilations (...) Here we will focus on the progress, which - to our opinion - has been achieved since the latter conference with respect to the conceptual aspects and operational procedures in the subject area of distribution and transformation of metal species in solid waste materials.
  • info:eu-repo/semantics/openAccess
TUHH Open Research

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