Experimental approach and simulation of the retention processes limiting orthophosphate transport in groundwater
| Autor: | Ute Döring, Andreas Möller, Georg Mattheß, Jürgen Schröter, Margot Isenbeck-Schröter |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
geography
geography.geographical_feature_category Chemistry Langmuir adsorption model Mineralogy Thermodynamics Sorption Aquifer symbols.namesake chemistry.chemical_compound TRACER Mass transfer symbols Environmental Chemistry Aluminium phosphate Convection–diffusion equation Groundwater Water Science and Technology |
| Zdroj: | Journal of Contaminant Hydrology. 14:143-161 |
| ISSN: | 0169-7722 |
| DOI: | 10.1016/0169-7722(93)90036-r |
| Popis: | Orthophosphate transport behaviour was studied in laboratory experiments by continuously injecting KH 2 PO 4 -contaminated groundwater into columns filled with aquifer sand. Sorption parameters for the application of the kinetic two-site Langmuir equation were derived from batch experiments. The phosphate breakthrough curves of the column experiments were simulated with a transport model based on a numerical approximation of the one-dimensional transport equation. The processes of sorption were included in the model using the two-site Langmuir isotherm with first-order kinetics. The breakthrough curves indicated precipitation processes occur in the columns. The equilibration of the tracer solution with aluminium phosphate (variscite) was calculated using the thermodynamic model program PHREEQE. The simulation of mineral equilibration and sorption allows differentiation of retention phenomena at the sediment-water interface and the prediction of orthophosphate transport in soil-water systems under various geochemical conditions. |
| Databáze: | OpenAIRE |
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