| Title | A COMBINED PHREEQC-2/PARALLEL FRACTURE MODEL FOR THE SIMULATION OF LAMINAR/NON-LAMINAR FLOW AND CONTAMINANT TRANSPORT WITH REACTIONS |
| Abstract | A combination of a parallel fracture model with the PHREEQC-2 geochemical model was
developed to simulate sequential flow and chemical transport with reactions in fractured
media where both laminar and turbulent flows occur. The integration of non-laminar flow
resistances in one model produced relevant effects on water flow velocities, thus improving
model prediction capabilities on contaminant transport. The proposed conceptual model
consists of 3D rock-blocks, separated by horizontal bedding plane fractures with variable
apertures. Particle tracking solved the transport equations for conservative compounds and
provided input for PHREEQC-2. For each cluster of contaminant pathways, PHREEQC-2
determined the concentration for mass-transfer, sorption/desorption, ion exchange, mineral
dissolution/precipitation and biodegradation, under kinetically controlled reactive processes of
equilibrated chemical species. Field tests have been performed for the code verification. As an
example, the combined model has been applied to a contaminated fractured aquifer of
southern Italy in order to simulate the phenol transport. The code correctly fitted the field
available data and also predicted a possible rapid depletion of phenols as a result of an
increased biodegradation rate induced by a simulated artificial injection of nitrates, upgradient
to the sources. |
| Source | Journal of contaminant hydrology 117, pp. 94–108 |
| Keywords | Groundwater pollutionFractures flowContaminant transportGeochemical modelBioremediation |
| Journal | Journal of contaminant hydrology |
| Editor | Elsevier, Tokyo ;, Paesi Bassi |
| Year | 2010 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.jconhyd.2010.07.003 |
| Authors | MASCIOPINTO C., PALMIOTTA D., VOLPE A., CHERUBINI C. |
| Text | 42390 2010 10.1016/j.jconhyd.2010.07.003 Groundwater pollution Fractures flow Contaminant transport Geochemical model Bioremediation A COMBINED PHREEQC 2/PARALLEL FRACTURE MODEL FOR THE SIMULATION OF LAMINAR/NON LAMINAR FLOW AND CONTAMINANT TRANSPORT WITH REACTIONS MASCIOPINTO C., PALMIOTTA D., VOLPE A., CHERUBINI C. Consiglio Nazionale delle Ricerche, Istituto di Ricerca Sulle Acque, Reparto di Chimica e Tecnologia delle Acque, via Francesco De Blasio 5, 70132 Bari, Italy. Politecnico di Bari, Dipartimento di Ingegneria delle Acque e di Chimica, via Orabona 42, 70126 Bari, Italy. A combination of a parallel fracture model with the PHREEQC 2 geochemical model was developed to simulate sequential flow and chemical transport with reactions in fractured media where both laminar and turbulent flows occur. The integration of non laminar flow resistances in one model produced relevant effects on water flow velocities, thus improving model prediction capabilities on contaminant transport. The proposed conceptual model consists of 3D rock blocks, separated by horizontal bedding plane fractures with variable apertures. Particle tracking solved the transport equations for conservative compounds and provided input for PHREEQC 2. For each cluster of contaminant pathways, PHREEQC 2 determined the concentration for mass transfer, sorption/desorption, ion exchange, mineral dissolution/precipitation and biodegradation, under kinetically controlled reactive processes of equilibrated chemical species. Field tests have been performed for the code verification. As an example, the combined model has been applied to a contaminated fractured aquifer of southern Italy in order to simulate the phenol transport. The code correctly fitted the field available data and also predicted a possible rapid depletion of phenols as a result of an increased biodegradation rate induced by a simulated artificial injection of nitrates, upgradient to the sources. 117 Articolo pubblicato JCH_2010.pdf Articolo in rivista Elsevier 0169 7722 Journal of contaminant hydrology Journal of contaminant hydrology J. contam. hydrol. Journal of contaminant hydrology. angela.volpe VOLPE ANGELA costantino.masciopinto MASCIOPINTO COSTANTINO TA.P04.005.010 Metodi, dispositivi di stima dei parametri idrogeologici e modelli matematici |
