Leaching behavior and solubility -- Controlling solid phases of heavy metals in municipal solid waste incinerator ash
- Swiss Federal Inst. of Environmental Science and Technology, Duebendorf (Switzerland)
- Baltic Sea Research Inst., Rostock (Germany). Marine Geology Section
- Swiss Federal Labs. for Materials Testing and Research, Duebendorf (Switzerland)
This paper highlights the uses and limitations of thermodynamic calculations in the planning of leach tests in the laboratory or for research in the field. Heavy metal solubility has been studied in leachate from Landfill Lostorf, AG, Switzerland. Also, the influence of pH on the solubility of Cu, Pb, Cd and Zn has been determined in the laboratory. The results have been compared with the maximum allowable heavy metal concentrations in equilibrium with the appropriate (hydr)oxides and carbonates. Copper is supersaturated with respect to Cu(OH){sub 2} in both laboratory and field studies. Complexation with organic ligands is a probable explanation for this observation. Both Zn and Pb are undersaturated with respect to pure (hydr)oxides and carbonates, though agreement between calculations and measurements are close enough, that PbCO{sub 3} could be controlling the solubility in the laboratory experiments. The markedly lower concentrations of Pb in the field in comparison with the laboratory data could be explained by the affinity for Pb to bind to solids and the higher solid:solution ratio in field conditions. The solubility of Cd could be controlled by the formation of CdCO{sub 3}. The relatively high concentrations of Mo in the landfill leachate could be limited by the precipitation of CaMoO{sub 4}.
- OSTI ID:
- 464831
- Report Number(s):
- CONF-9509276--
- Journal Information:
- Waste Management, Journal Name: Waste Management Journal Issue: 1-3 Vol. 16; ISSN WAMAE2; ISSN 0956-053X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Assessing the potential long-term behavior of the landfill fraction of sorted demolition wastes
The effect of organic acids on the leaching of heavy metals from mine tailings