Removal of trace elements from landfill leachate by calcite precipitation |
| |
| Authors: | Vojt ch Ettler Olga Zelen Martin Mihaljevi
Ond&#x;ej &#x;ebek Ladislav Strnad Pavel Coufal Petr Bezdi
ka |
| |
| Institution: | aInstitute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic;bLaboratories of Geological Institutes, Charles University, Albertov 6, 128 43, Praha 2, Czech Republic;cDepartment of Analytical Chemistry, Charles University, Hlavova 2030/8, 128 43, Praha 2, Czech Republic;dInstitute of Inorganic Chemistry, Academy of Science of the Czech Republic, 250 68 Řež, Czech Republic |
| |
| Abstract: | Spontaneous precipitation of secondary calcite (CaCO3) has been observed in 25 samples of landfill leachate-polluted stream waters. During the 6-month precipitation experiment, the formation of calcite acts as a principal trace-element scavenging process. The concentrations of Fe, Sr, Ba and Mn and other trace elements in solution significantly decreased as calcite formed during the experiments. The PHREEQC-2 geochemical code indicated high supersaturation of the initial leachate-polluted waters with respect to calcite. The chemical/mineralogical study (SEM/EDS, XRD, ICP MS) revealed that this newly formed calcite contains considerable amounts of metals and metalloids removed from solution. Such a geochemical process can be considered to be important for spontaneous decontamination in landfill-affected environments (stream sediments, soils) or landfill technical facilities (settling basins). This removal takes place especially during dry periods with low rain precipitation, when the landfill waters exhibit both higher alkalinity and higher trace element concentrations. |
| |
| Keywords: | Landfill leachate Calcite Scavenging Trace elements PHREEQC-2 |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
