Estimating pollutant concentration in soil seepage water - mobilization of inorganic pollutants by carbondioxide

As part of the Federal Programme on the assessment of seepage water pollutant concentration in contaminated soil and waste like municipal incineration slag and building rubble we investigate the influence of CO2 on pollutant concentration. The partial pressure of CO2 in the pore space of soil or deposited material is always higher than in the atmosphere. Column tests under non saturated conditions are conducted to obtain seepage water under controled pore gas composition regarding O2,N2,CO2. Different partial pressures of CO2 will be applied between atmospheric and complete saturation. This setup is considered to deliver concentrations similar to those under field conditions and will therefore serve as a reference system. We will also conduct column tests under water saturated conditions and batch extraction tests in order to see if and t what extent the effects observed in the simpler approaches can be related to the reference system. The aim is to develop an elution (column test) or extraction procedure (batch test) including CO2 as a mobilizing agent. The test should be a reliable tool for the assessment of pollutant release from the abovementioned materials.

• 1-03.305V
  Förstner U., Calmano W.: Characterisation of Dredged Materials. Wat. Sci. Technol. 38(11): 149-157 (1998)
• 1-03.307V
  Förstner U., Haase I.: Geochemical demobilization of metallic pollutants in solid waste materials: Study on the pollution potential of zinc and arsenic in water-works sludges. J. Geochem. Explor. 62: 29-36 (1998)
• 1-03.311V
  Förstner U.: Altlasten und Grundwasser - Naturwissenschaftliche Forschung für künftige Problemlösungen. Vom Wasser 91: 325-334 (1998)
• 1-03.312V
  Förstner U.: Altlasten und Grundwasser: Chemische und biologische Aspekte. In: Bayer E. et al. (Hrsg.) Umwelt und Chemie. Gesellschaft Deutscher Chemiker. Monographie Band 8, S. 175-184. Frankfurt a.M. 1997
• 1-03.319V
  Förstner U.: Gefahrenbeurteilung von Böden und Altlasten/Schutz des Grundwassers: Kritische Anmerkungen zu Konzept und Methode der Gefahrenbeurteilung. In: Franzius, V. + Bachmann G. (Hrsg.) Sanierung kontaminierter Standorte und Bodenschutz 1998. S. 43-54. Erich Schmidt Verlag Berlin 1998
• 1-03.326V
  Förstner U.: Langzeitprognosen und naturnahe Dauerlösungen - Ingenieur-geochemische Konzepte für Schadstoffe in Abfällen auf Deponien und in Böden. Geowissenschaften 14, 169-173 (1996)
• 1-03.340V
  Förstner U., Thöming J.: Altlasten einfach wegrechnen? Bodenschutz 3: 72-73 (1997)

Stichwörter

• contaminated soils
• ground-water pollution
• leachate value
• soil seepage water