Research Interests: Engineering, Environmental Engineering, Recycling, Numerical Analysis, Waste Management, and 12 moreRisk assessment, Medicine, Corrosion, Finite Element Analysis, Computer Simulation, Spontaneous combustion, IT Value, Washington, Risk Assessment, Risk Evaluation, Motor vehicles act, and Parametric analysis
Research Interests: Algorithms, Chemistry, Medicine, Multidisciplinary, Dispersion, and 15 moreNumerical Simulation, Contaminant hydrology, Porosity, Diffusion, Porous Media, Advection, Precipitation, High Resolution, Chemical Precipitation, Numerical Model, Calcium Carbonate, Calcium Chloride, Sodium Chloride, Soil Pollutants, and Heterogeneous porous media
The code RETRASO (REactive TRAnsport of SOlutes) simulates reactive transport of dissolved and gaseous species in non-isothermal saturated or unsaturated problems. Possible chemical reactions include aqueous complexation (including redox... more
The code RETRASO (REactive TRAnsport of SOlutes) simulates reactive transport of dissolved and gaseous species in non-isothermal saturated or unsaturated problems. Possible chemical reactions include aqueous complexation (including redox reactions), sorption, precipitation-dissolution of minerals and gas dissolution. Various models for sorption of solutes on solids are available, from experimental relationships (linear KD, Freundlich and Langmuir isotherms) to cation exchange and
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SummaryWe analyze remediation alternatives for a soil contaminated with
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ABSTRACT Evaporation controls the salinity of many natural and anthropic brine systems, but the reverse is also true. By controlling water activity, salinity affects evaporation rates. We present a method to compute the evolution of water... more
ABSTRACT Evaporation controls the salinity of many natural and anthropic brine systems, but the reverse is also true. By controlling water activity, salinity affects evaporation rates. We present a method to compute the evolution of water activity in high salinity systems so as to evaluate evaporation rates. We place special emphasis on the assessment of invariant points, where activity is controlled by the set of precipitated minerals. The algorithm is tested on a natural Mg-SO4 rich brine evaporation experiment. In accordance with the experiments, the model predicts two intervals (invariant points) in which water activity, the concentration of all species and the amount of liquid water remain constant, because evaporating water comes from the dissolution of hydrated minerals. This suggests that mineral paragenesis might have a considerable influence on shallow brine lake evolution by fixing chemical composition for a significant portion of time. This conjecture was tested with a simplified model of a perennial saline playa lake. An analytical solution was developed to illustrate the evolution of the proposed system. According to the calculations, the system tends to a cyclical steady state for both lake level and chemical composition. The latter remains fixed at invariant points during long time intervals, where hydrated minerals act as the water source for evaporation. This situation is to be expected in epsomite lakes where two invariant points can be found in equilibrium with relative humidities of 57% and 50%.
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Research Interests: Algorithms, Chemistry, Medicine, Multidisciplinary, Dispersion, and 15 moreNumerical Simulation, Contaminant hydrology, Porosity, Diffusion, Porous Media, Advection, Precipitation, High Resolution, Chemical Precipitation, Numerical Model, Calcium Carbonate, Calcium Chloride, Sodium Chloride, Soil Pollutants, and Heterogeneous porous media
... The model code CHEMFRONTS (Bäverman et al., 1999) uses this approach. ... 2. Numerical approaches. 2.1. Sequential iteration approach (SIA). 2.1.1. Equations. Reactive transport can be formulated in different ways, leading to... more
... The model code CHEMFRONTS (Bäverman et al., 1999) uses this approach. ... 2. Numerical approaches. 2.1. Sequential iteration approach (SIA). 2.1.1. Equations. Reactive transport can be formulated in different ways, leading to effectively different mathematical problems. ...
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Research Interests: Engineering, Ecological Engineering, Earth Sciences, Environmental Science, Environmental Sciences, and 15 moreNumerical Simulation, Nitrogen, Mathematical Model, Constructed Wetland, Surface Area, Biochemical Pathways, Pilot Plant, Hydraulic Loading Rate, Subsurface Flow, Organic Matter, Simulation Model, Organic Loading Rate, Reed Bed, Removal Efficiency, and tracer test
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Research Interests: Chemical Engineering, Kinetics, Modeling, Wastewater Treatment, Reactive transport modeling, and 15 moreBiodegradation, Numerical Simulation, Wetland, Calibration, Nitrogen, Positive Affect, Constructed Wetland, Pollutant, Hydraulic Loading Rate, Subsurface Flow, Organic Matter, Initial Condition, Kinetic Parameter, Reed Bed, and tracer test
ABSTRACT Coastal karst features are supposed to be generated by the coupling between the infiltration of undersaturated rain water together with mixing from the fresh–saltwater interface. A coupled density-driven flow and reactive solute... more
ABSTRACT Coastal karst features are supposed to be generated by the coupling between the infiltration of undersaturated rain water together with mixing from the fresh–saltwater interface. A coupled density-driven flow and reactive solute transport numerical model is presented which is able to duplicate conditions in such a morphogenetic conceptual model. KeywordsReactive transport–Numerical modeling–Karst–Fresh–saline water interface