Modelling Efficacy of Soil Vapour Extraction (SVE) in Waste Sites Polluted by Hydrocarbons: A Case Study
The effectiveness of soil vapour extraction (SVE) in the remediation of a site polluted by hydrocarbons located in Southern Italy (Brindisi), has been tested by means of experimental data and a computational code. SVE is one of the most frequent techniques used for the remediation of vadose zones contaminated by hydrocarbons. In the case studied, actual BTEX (Benzene, Toluene, Ethylbenzene and Xylenes) and TPH (Total Petroleum Hydrocarbons) contamination have been considered. The application aimed to examine some technical and economic features of the SVE technique, as well as to point out the very important role of mathematical models in management of contaminated sites. The code simulation predicted both contaminant depletion trends and remediation times at polluted site. The simulation results pointed out different remediation performance for BTEX (more than 150 days) and TPH (more than 600 days) removal. The treatment costs of the simulated SVE “on site” technique resulted competitive with respect to the other “ex site” methods which can be carried out at the same contaminated area and should be encouraged by the local authorities.
AA.VV. (1996). Protezione e bonifica di falde acquifere soggette a inquinamento da idrocarburi, Quaderno n.2 I.R.I.S. Bios-Cosenza (I).
AA.VV. (1990). ‘Rete per il monitoraggio qualitativo delle acque delle falde idriche sotterranee presenti nell’’area della costruenda centrale elettrica di Brindisi’. Proc. 1° convegno nazionale sulla protezione e gestione delle acque sotterranee. Modena, 20-21-22 September 1990.
Bear, J. (2002). Computer mediated distance learning course on: ‘Modeling groundwater flow and contaminant transport’ http://www.heath-hydrology.com/cmdl/demos/mgfc-course/mgfctoc.html
Bear, J. (1972). Dynamics of Fluids in Porous Media – American Elsevier.
Bear, J. (1979). Hydraulics of groundwater. McGraw Hill.
Bear, J. and A. Verruijt (1989). Modeling Groundwater flow and pollution. D.Reidel Publishing Company.
Decreto Ministeriale 25 ottobre 1999, n.471 – Regolamento recante criteri, procedure e modalità per la messa in sicurezza, la bonifica e il ripristino ambientale dei siti inquinati, ai sensi dell’articolo 17 del decreto legislativo 5 febbraio 1997, n.22, e successive modificazioni e integrazioni – Supplemento ordinario alla “Gazzetta Ufficiale” n.293 del 15 dicembre 1999 – Serie generale.
Gaudet, J.P., Jégat, H., Vachaud, G. and P. J. Vierenga (1977). Solute Transfer, with Exchange between Mobile and Stagnant Water, through Unsaturated Sand. Soil Science Society of America Journal, 41(4), 665.
Guiguer, N., Franz, T. and J. Zaidel (1995). Airflow/SVE, Version 1. Axisymmetric Vapor Flow and Transport Simulation Model. Waterloo Hydrogeologic Software.
Masciopinto, C., Uricchio, V., Festa, V. and V. Moretti (1999). Deflusso idrico in un acquifero carsico fratturato del Salento Sud Occidentale (Puglia): cavità e barriere impermeabili. IGEA, 13, 31-40.
Millington, R.J. and J.M. Quirk (1961). Permeability of porous solids. Trans. Faraday Soc., 57, 1200-1207.
Ortega, J.M. and W.C. Rheinboldt (1970). Iterative Solution of Nonlinear Equations in several variables. Academic Press, New York.
Parker, J.C. (1989). Modeling contaminant transport in soils and groundwater. Lecture notes for course presented at Institute for Hydromechanics and Water Resources Management. ETH – Honggerberg. Zurich, Switzerland.
Robertiello, A. (2001). Casi di studio. In: La bonifica biologica di siti inquinati da idrocarburi, Hoepli.
Unger, A.J.A., Sudickly, E.A. and P.A. Forsith (1995). Mechanisms controlling vacuum extraction coupled with air sparging for remediation of heterogeneous formations contaminated by dense non-aqueous phase liquids. Water Resources Research, 31(8), 1913-1925.
http://www.sojournweb.com/assve.htm: (2002). Air Sparging and Soil Vapor Extraction.
http://clu-in.org/techfocus: (2002). Clu-in Technology Focus.
http://www.frtr.gov/cost/index.html: (2002). Federal Remediation Technologies Roundtable; Cost and Performance.
http://www.atsdr.cdc.gov/(2002). Total Petroleum hydrocarbons.
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http://www.nap.edu/openbook/0309065496/html/129.html: (2002). DNAPLs: Technologies for characterization, remediation and containment.